Method and apparatus for performing channel access for psfch transmission in unlicensed band

Abstract

A method for performing wireless communication by a first device and an apparatus supporting the same are provided. The method may comprise the steps of: receiving information related to a channel occupancy time (COT) from a second device; receiving a first physical sidelink shared channel (PSSCH) from a second device; determining a first physical sidelink feedback channel (PSFCH) resource for transmission of a first PSFCH related to the first PSSCH; and performing a second type of channel access for the first PSFCH transmission within the COT.

Description

Technical Field

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

[0002] Sidelink (SL) refers to a communication method in which a direct link is configured between user equipment (UE) to directly exchange voice or data between user equipment without passing through a base station (BS). SL is being considered as a solution to the burden on base stations caused by the rapid increase in data traffic. V2X (Vehicle to Everything) refers to a communication technology that exchanges information with other vehicles, pedestrians, and objects equipped with infrastructure through wired / wireless communication. V2X can be divided into four types: V2V (Vehicle to Vehicle), V2I (Vehicle to Infrastructure), V2N (Vehicle to Network), and V2P (Vehicle to Pedestrian). V2X communication can be provided through the PC5 interface and / or the Uu interface.

[0003] In addition, as more and more communication devices require greater communication capacity, the demand for enhanced mobile broadband communication compared to previous radio access technology (RAT) is rising. Therefore, communication systems for reliability and delay-sensitive services or user equipment (UE) are discussed. And, the next generation radio access technology based on improved mobile broadband communication, massive machine type communication (MTC), ultra-reliable low latency communication (URLLC), etc. can be called new radio access technology (RAT) or new radio (NR). Summary of the invention

[0004] Technical Solution

[0005] In an embodiment, a method for performing wireless communication by a first device is provided. The method may include: receiving information related to a channel occupancy time (COT) from a second device; receiving a first physical sidelink shared channel (PSSCH) from the second device; determining a first PSFCH resource for a first physical sidelink feedback channel (PSFCH) transmission related to the first PSSCH; and performing a second type of channel access for the first PSFCH transmission within the COT. For example, the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0006] In an embodiment, a first device adapted to perform wireless communication is provided. The first device may include: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations including the following items based on being executed by the at least one processor: receiving information related to a channel occupancy time (COT) from a second device; receiving a first physical sidelink shared channel (PSSCH) from a second device; determining a first PSFCH resource for a first physical sidelink feedback channel (PSFCH) transmission related to the first PSSCH; and performing a second type of channel access for the first PSFCH transmission within the COT. For example, the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0007] In an embodiment, a processing device suitable for controlling a first device is provided. The processing device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations including the following items based on being executed by the at least one processor: receiving information related to a channel occupancy time (COT) from a second device; receiving a first physical sidelink shared channel (PSSCH) from a second device; determining a first PSFCH resource for a first physical sidelink feedback channel (PSFCH) transmission related to the first PSSCH; and performing a second type of channel access for the first PSFCH transmission within the COT. For example, the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0008] In an embodiment, a non-transitory computer-readable storage medium storing instructions is provided. The instructions, when executed, may cause a first device to perform operations including: receiving information related to a channel occupancy time (COT) from a second device; receiving a first physical sidelink shared channel (PSSCH) from a second device; determining a first PSFCH resource for a first physical sidelink feedback channel (PSFCH) transmission related to the first PSSCH; and performing a second type of channel access for the first PSFCH transmission within the COT. For example, the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0011] Figure 3 The structure of the NR system based on the embodiment of the present disclosure is shown.

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

[0013] Figure 5 The structure of the radio frame of NR based on the embodiment of the present disclosure is shown.

[0014] Figure 6 The structure of the time slot of the NR frame based on the embodiment of the present disclosure is shown.

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

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

[0017] Fig. 9 Three cast types based on embodiments of the present disclosure are shown.

[0018] Fig.10 Interleaved RBs based on an embodiment of the present disclosure are shown.

[0019] Fig.11 A method for a COT responding UE to perform PSFCH transmission to a COT initiating UE and / or another UE based on channel access type 2 according to an embodiment of the present disclosure is shown.

[0020] Fig.12 A method for a COT responding UE to perform PSFCH transmission to a COT initiating UE and / or another UE based on channel access type 2 according to an embodiment of the present disclosure is shown.

[0021] Fig.13 A method for a COT responding UE to perform PSFCH transmission to a COT initiating UE and / or another UE based on channel access type 2 according to an embodiment of the present disclosure is shown.

[0022] Fig.14 An example of having multiple PSFCH opportunities for each PSCCH / PSSCH according to an embodiment of the present disclosure is shown.

[0023] Fig.15 A method for a first device to perform wireless communication based on an embodiment of the present disclosure is shown.

[0024] Fig.16 A method for a second device to perform wireless communication based on an embodiment of the present disclosure is shown.

[0025] Fig.17 A communication system 1 according to an embodiment of the present disclosure is shown.

[0026] Fig.18 A wireless device according to an embodiment of the present disclosure is shown.

[0027] Fig.19 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

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

[0029] Fig.21 A handheld device according to an embodiment of the present disclosure is shown.

[0030] Fig. 22 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0031] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, in the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in the present disclosure, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, C".

[0032] A slash ( / ) or a comma used in the present disclosure may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0033] In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, in the present disclosure, the expression "at least one of A or B" or "at least one of A and / or B" may be interpreted as "at least one of A and B".

[0034] In addition, in the present disclosure, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". In addition, "at least one of A, B, or C" or "at least one of A, B and / or C" may mean "at least one of A, B, and C".

[0035] In addition, brackets used in the present disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean proposing "PDCCH" as an example of "control information". In other words, the "control information" of the present disclosure is not limited to "PDCCH", and "PDDCH" may be proposed as an example of "control information". Specifically, when indicated as "control information (i.e., PDCCH)", this may also mean proposing "PDCCH" as an example of "control information".

[0036] In the following description, "when, if, or in the event of" may be replaced with "based on".

[0037] The technical features respectively described in one drawing in the present disclosure may be implemented separately or may be implemented simultaneously.

[0038] In the present disclosure, the higher layer parameter may be a parameter configured, preconfigured or predefined for the UE. For example, the base station or the network may send the higher layer parameter to the UE. For example, the higher layer parameter may be sent via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0039] The techniques described below can be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA can be implemented using radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. IEEE 802.16m is an evolved version of IEEE 802.16e and provides backward compatibility for systems based on IEEE 802.16e. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (LTE-A) is an evolution of LTE.

[0040] 5G NR is a subsequent technology of LTE-A corresponding to a new mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can use all available spectrum resources including low frequency bands less than 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequency bands above 24 GHz (millimeter waves).

[0041] The 6G (wireless communication) system has objectives such as (i) very high data rates per device, (ii) very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced energy consumption of battery-free IoT devices, (vi) ultra-reliable connectivity, and (vii) networked intelligence with machine learning capabilities. The vision of the 6G system may include four aspects such as intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and the 6G system may meet the requirements shown in Table 1 below. That is, Table 1 shows the requirements of the 6G system.

[0042] [Table 1]

[0043]

[0044]

[0045] The 6G system may have key factors such as enhanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC), massive machine type communications (mMTC), AI-integrated communications, tactile Internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0046] Figure 1 A communication structure that can be provided in a 6G system based on an embodiment of the present disclosure is shown. Figure 1 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0061] - Massive MIMO technology (Large MIMO)

[0062] -Holographic Beamforming (HBF)

[0063] -Optical wireless technology

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

[0065] -Non-Terrestrial Network (NTN)

[0066] -Quantum communication

[0067] - No cellular communication

[0068] -Integration of wireless information and power transmission

[0069] -Integration of wireless communication and sensing

[0070] -Integrated access and backhaul network

[0071] -Big Data Analysis

[0072] -Reconfigurable smart surface

[0073] -Metaverse

[0074] -Blockchain

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

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

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

[0078] Figure 3 The structure of the NR system based on the embodiment of the present disclosure is shown. Figure 3 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0079] Reference Figure 3 , the next generation radio access network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol terminations to the UE 10. For example, the BS 20 may include a next generation Node B (gNB) and / or an evolved Node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to as other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. For example, the BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to as other terms such as a base transceiver system (BTS), an access point (AP), etc.

[0080] Figure 3 The embodiment of the present invention illustrates a case where only gNB is included. BS20 may be connected to each other via an Xn interface. BS20 may be connected to each other via a fifth generation (5G) core network (5GC) and an NG interface. More specifically, BS20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a user plane function (UPF) 30 via an NG-U interface.

[0081] The radio interface protocol layer between the UE and the network can be classified into the first layer (L1), the second layer (L2), and the third layer (L3) based on the lower three layers of the open system interconnection (OSI) model known in the communication system. Among them, the physical (PHY) layer belonging to the first layer provides an information transmission service using a physical channel, and the radio resource control (RRC) layer located at the third layer controls the radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0082] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 4 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4 (a) shows a radio protocol stack for the user plane of Uu communication, and Figure 4 (b) in FIG. 5 shows a radio protocol stack of a control plane for Uu communication. Figure 4 (c) in FIG. 1 shows a radio protocol stack of a user plane for SL communication, and Figure 4 (d) in FIG. 5 shows a radio protocol stack of a control plane for SL communication.

[0083] Reference Figure 4 , the physical layer provides information transfer services to the upper layer through the physical channel. The physical layer is connected to the medium access control (MAC) layer, which is the upper layer of the physical layer, through the transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how the data is transmitted through the radio interface and what characteristics of the data it transmits.

[0084] Data is transmitted through a physical channel between different physical layers (ie, a PHY layer of a transmitter and a PHY layer of a receiver). The physical channel may be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

[0085] The MAC layer provides services to the Radio Link Control (RLC) layer via logical channels, and the RLC layer is a higher layer of the MAC layer. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transmission services through logical channels.

[0086] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). In order to ensure different Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three types of operation modes, namely, Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction through Automatic Repeat Request (ARQ).

[0087] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer is used to control logical channels, transport channels, and physical channels associated with the configuration, reconfiguration, and release of RBs. RBs are logical paths for data transmission between UEs and networks provided by the first layer (i.e., the physical layer or PHY layer) and the second layer (i.e., the MAC layer, the RLC layer, the packet data convergence protocol (PDCP) layer, and the service data adaptation protocol (SDAP) layer).

[0088] The functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include transmission, header compression and encryption of user data. The functions of the Packet Data Convergence Protocol (PDCP) layer in the control plane include transmission and encryption / integrity protection of control plane data.

[0089] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and QoS Flow ID (QFI) marking in both DL and UL packets.

[0090] Configuration of RB means a process for specifying radio protocol layers and channel attributes to provide a specific service and for determining corresponding detailed parameters and operation methods. RBs can then be classified into two types, namely, signaling radio bearers (SRBs) and data radio bearers (DRBs). SRBs are used as a path for sending RRC messages in the control plane, and DRBs are used as a path for sending user data in the user plane.

[0091] When the RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state, otherwise the UE can be in the RRC idle (RRC_IDLE) state. In the case of NR, the RRC inactive (RRC_INACTIVE) state is additionally defined, and the UE in the RRC_INACTIVE state can maintain the connection with the core network and release its connection with the BS.

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

[0093] Examples of logical channels belonging to a higher layer of a transport channel and mapped to a transport channel may include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

[0094] Figure 5 The structure of a radio frame of NR according to an embodiment of the present disclosure is shown. Figure 5 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0095] Reference Figure 5 In NR, a radio frame can be used to perform uplink and downlink transmissions. The length of a radio frame is 10ms and can be defined as consisting of two half frames (HF). A half frame can include five 1ms subframes (SF). A subframe (SF) can be divided into one or more time slots, and the number of time slots within a subframe can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP).

[0096] When a normal CP is used, each time slot may include 14 symbols. When an extended CP is used, each time slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or a CP-OFDM symbol) and a single carrier-FDMA (SC-FDMA) symbol (or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol).

[0097] Table 2 shown below represents the number of symbols (N) per slot based on the SCS configuration (μ) in the case of using a normal CP or an extended CP. slot symb ), the number of time slots per frame (N frame,μ slot ) and the number of time slots per subframe (N subframe ,μ slot ).

[0098] [Table 2]

[0099]

[0100]

[0101] In the NR system, OFDM (A) parameter sets (e.g., SCS, CP length, etc.) between multiple cells integrated into one UE may be configured differently. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., a subframe, a time slot, or a TTI) (collectively referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently in the integrated cells.

[0102] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, with an SCS of 15kHz, a wide range of traditional cellular bands can be supported, and with an SCS of 30kHz / 60kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. With an SCS of 60kHz or higher, bandwidths greater than 24.25GHz can be used to overcome phase noise.

[0103] The NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values ​​of the frequency ranges may be changed (or varied), for example, the two different types of frequency ranges may be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 may mean "a range below 6 GHz", and FR2 may mean "a range above 6 GHz", and may also be referred to as millimeter wave (mmW).

[0104] [Table 3]

[0105] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0106] As described above, the value of the frequency range in the NR system may be changed (or varied). For example, as shown in Table 4 below, FR1 may include a bandwidth in the range of 410 MHz to 7125 MHz. More specifically, FR1 may include frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 may include unlicensed frequency bands. Unlicensed frequency bands may be used for various purposes, for example, unlicensed frequency bands are used for vehicle-specific communications (e.g., autonomous driving).

[0107] [Table 4]

[0108] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0109] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown. Figure 6 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0110] Reference Figure 6 , a time slot includes multiple symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols. For example, in the case of extended CP, one time slot may include 12 symbols. Additionally, in the case of normal CP, one time slot may include 7 symbols. However, in the case of extended CP, one time slot may include 6 symbols.

[0111] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth part (BWP) can be defined as multiple consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP can correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via an activated BWP. Each element can be referred to as a resource element (RE) in a resource grid, and a complex symbol can be mapped to each element.

[0112] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0113] A BWP may be a contiguous set of physical resource blocks (PRBs) within a given parameter set. A PRB may be selected from a contiguous set of common resource blocks (CRBs) for a given parameter set on a given carrier.

[0114] For example, the BWP may be at least any one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor the downlink radio link quality in a DL BWP other than an activated DL BWP on a primary cell (PCell). For example, the UE may not receive a PDCCH, a physical downlink shared channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) other than an activated DL BWP. For example, the UE may not trigger a channel state information (CSI) report for an unactivated DL BWP. For example, the UE may not send a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) other than an activated UL BWP. For example, in the case of a downlink, the initial BWP may be given as a set of contiguous RBs for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by a physical broadcast channel (PBCH)). For example, in the case of an uplink, the initial BWP may be given by a system information block (SIB) for a random access procedure. For example, a default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be the initial DL BWP.For power saving, if the UE cannot detect downlink control information (DCI) during a designated period, the UE may switch the UE's active BWP to the default BWP.

[0115] In addition, a BWP can be defined for SL. The same SL BWP can be used in transmission and reception. For example, a transmitting UE can send a SL channel or a SL signal on a specific BWP, and a receiving UE can receive a SL channel or a SL signal on a specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have configuration signaling separate from the Uu BWP. For example, the UE can receive a configuration for the SL BWP from the BS / network. For example, the UE can receive a configuration for the Uu BWP from the BS / network. SLBWP is (pre-)configured in the carrier for out-of-coverage NR V2X UEs and RRC_IDLE UEs. For UEs in RRC_CONNECTED mode, at least one SL BWP can be activated in the carrier.

[0116] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown. Figure 7 The embodiments of can be combined with various embodiments of the present disclosure. Figure 7 In an implementation manner, the number of BWPs is 3.

[0117] Reference Figure 7, a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier frequency band to the other end thereof. Additionally, a PRB may be a resource block numbered within each BWP. Point A may indicate a common reference point of a resource block grid.

[0118] It can be obtained by point A, the offset relative to point A (N start BWP ) and bandwidth (N size BWP ) to configure the BWP. For example, point A can be an external reference point of the PRBs of the carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) are aligned in point A. For example, the offset can be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth can be the number of PRBs within a given parameter set.

[0119] Hereinafter, V2X or SL communication will be described.

[0120] The side link synchronization signal (SLSS) may include a primary side link synchronization signal (PSSS) and a secondary side link synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a side link primary synchronization signal (S-PSS), and the SSSS may be referred to as a side link secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

[0121] The physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for sending default (system) information, which the UE must first know before SL signal transmission / reception. For example, the default information can be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to resource pool, type of application related to SLSS, subframe offset, broadcast information, etc. For example, in order to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH can be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0122] S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sidelink synchronization signal block (S-SSB)). The S-SSB can have the same parameter set (i.e., SCS and CP length) as the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in the carrier, and the transmission bandwidth can exist within the (pre-) configured sidelink (SL) BWP. For example, the S-SSB can have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH can exist across 11 RBs. In addition, the frequency position of the S-SSB can be (pre-) configured. Therefore, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0123] Figure 8 A process of performing V2X or SL communication based on a transmission mode by a UE according to an embodiment of the present disclosure is shown. Figure 8 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for ease of explanation, in LTE, the transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

[0124] For example, Figure 8 (a) in FIG. 1 shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. In addition, for example, Figure 8 (a) in FIG. 1 shows UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to conventional SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0125] For example, Figure 8 (b) in FIG. 4 shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. In addition, for example, Figure 8 (b) in FIG. 1 shows UE operations related to NR resource allocation mode 2.

[0126] Reference Figure 8 (a), in LTE transmission mode 1, LTE transmission mode 3 or NR resource allocation mode 1, the base station may schedule SL resources to be used by the UE for SL transmission. For example, in step S800, the base station may send information related to the SL resources and / or information related to the UL resources to the first UE. For example, the UL resources may include PUCCH resources and / or PUSCH resources. For example, the UL resources may be resources for reporting SL HARQ feedback to the base station.

[0127] For example, the first UE may receive information related to dynamic grant (DG) resources and / or information related to configuration grant (CG) resources from the base station. For example, the CG resources may include CG type 1 resources or CG type 2 resources. In the present disclosure, the DG resources may be resources configured / allocated to the first UE by the base station through downlink control information (DCI). In the present disclosure, the CG resources may be (periodic) resources configured / allocated to the first UE by the base station through DCI and / or RRC messages. For example, in the case of CG type 1 resources, the base station may send an RRC message including information related to the CG resources to the first UE. For example, in the case of CG type 2 resources, the base station may send an RRC message including information related to the CG resources to the first UE, and the base station may send a DCI related to the activation or release of the CG resources to the first UE.

[0128] In step S810, the first UE may send a PSCCH (e.g., sidelink control information (SCI) or a first-level SCI) to a second UE based on resource scheduling. In step S820, the first UE may send a PSSCH (e.g., a second-level SCI, a MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S830, the first UE may receive a PSFCH related to the PSCCH / PSSCH from the second UE. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second UE via the PSFCH. In step S840, the first UE may send / report the HARQ feedback information to the base station via the PUCCH or PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on the HARQ feedback information received from the second UE. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on a preconfigured rule. For example, the DCI may be a DCI for SL scheduling. For example, the format of DCI may be DCI format 3_0 or DCI format 3_1.

[0129] Reference Figure 8(b) in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the base station / network or the preconfigured SL resources. For example, the configured SL resources or the preconfigured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources within the configured resource pool. For example, the UE can autonomously select resources within the selection window by performing a sensing process and a resource (re)selection process. For example, sensing can be performed in units of subchannels. For example, in step S810, the first UE that has selected resources from the resource pool by itself can send a PSCCH (e.g., sidelink control information (SCI) or a first-level SCI) to a second UE by using the resources. In step S820, the first UE can send a PSSCH (e.g., a second-level SCI, a MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S830, the first UE can receive a PSFCH related to the PSCCH / PSSCH from the second UE.

[0130] Reference Figure 8 (a) or (b), for example, the first UE may send the SCI to the second UE via the PSCCH. Alternatively, for example, the first UE may send two consecutive SCIs (e.g., level 2 SCIs) to the second UE via the PSCCH and / or the PSSCH. In this case, the second UE may decode the two consecutive SCIs (e.g., level 2 SCIs) to receive the PSSCH from the first UE. In the present disclosure, the SCI sent via the PSCCH may be referred to as the first SCI, the first SCI, the first level SCI, or the first level SCI format, and the SCI sent via the PSSCH may be referred to as the second SCI, the second SCI, the second level SCI, or the second level SCI format. For example, the first level SCI format may include SCI format 1-A, and the second level SCI format may include SCI format 2-A and / or SCI format 2-B.

[0131] Hereinafter, an example of SCI format 1-A will be described.

[0132] SCI format 1-A is used for scheduling PSSCH and secondary SCI on PSSCH.

[0133] The following information is sent via SCI Format 1-A:

[0134] - Priority - 3 bits

[0135] - Frequency resource assignment - When the value of the higher layer parameter sl-MaxNumPerReserve is configured as 2, ceiling(log2(N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, when the value of the higher layer parameter sl-MaxNumPerReserve is configured as 3, ceiling log2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bit

[0136] - Time Resource Assignment - 5 bits when the higher layer parameter sl-MaxNumPerReserve is configured with a value of 2; otherwise, 9 bits when the higher layer parameter sl-MaxNumPerReserve is configured with a value of 3

[0137] -Resource reservation period - If the higher layer parameter sl-MultiReserveResource is configured, the ceiling(log2 N rsv_period ) bits, where N rsv_period is the number of entries in the higher layer parameter sl-ResourceReservePeriodList; otherwise, 0

[0138] -DMRS pattern -ceiling(log2 N pattern ) bits, where N pattern is the number of DMRS patterns configured by the higher layer parameter sl-PSSCH-DMRS-TimePatternList

[0139] - Second level SCI format - 2 bits, as defined in Table 5

[0140] - Beta_offset indicator - 2 bits, as provided by the higher layer parameter sl-BetaOffsets2ndSCI

[0141] - Number of DMRS ports - 1 bit, as defined in Table 6

[0142] - Modulation and coding scheme - 5 bits

[0143] - Additional MCS table indicator - 1 bit if one MCS table is configured by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured by the higher layer parameter sl-Additional-MCS-Table; otherwise, 0 bit

[0144] -PSFCH overhead indication - 1 bit if higher layer parameter sl-PSFCH-Period = 2 or 4; otherwise, 0 bit

[0145] - Reserved bits - The number of bits determined by the higher layer parameter sl-NumReservedBits, whose value is set to zero.

[0146] [Table 5]

[0147]

[0148]

[0149] [Table 6]

[0150] Value of the Number of DMRS Ports field Antenna Port 0 1000 1 1000 and 1001

[0151] Hereinafter, an example of SCI format 2-A will be described.

[0152] SCI format 2-A is used for decoding of PSSCH and is used together with the HARQ operation when the HARQ-ACK information includes ACK or NACK, when the HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.

[0153] The following information is sent via SCI Format 2-A:

[0154] -HARQ process number - 4 bits

[0155] - New data indicator - 1 bit

[0156] - Redundancy version - 2 bits

[0157] - Source ID - 8 bits

[0158] -Destination ID - 16 bits

[0159] -HARQ feedback enable / disable indicator - 1 bit

[0160] - Broadcast Type Indicator - 2 bits, as defined in Table 7

[0161] -CSI request - 1 bit

[0162] [Table 7]

[0163] The value of the playback type indicator Broadcast Type 00 broadcast 01 Multicast when HARQ-ACK information includes ACK or NACK 10 Unicast 11 Multicast when HARQ-ACK information includes only NACK

[0164] Hereinafter, an example of SCI format 2-B will be described.

[0165] For HARQ operation, when HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information, SCI format 2-B is used for decoding of PSSCH.

[0166] The following information is sent via SCI Format 2-B:

[0167] -HARQ process number - 4 bits

[0168] - New data indicator - 1 bit

[0169] - Redundancy version - 2 bits

[0170] - Source ID - 8 bits

[0171] -Destination ID - 16 bits

[0172] -HARQ feedback enable / disable indicator - 1 bit

[0173] - Region ID - 12 digits

[0174] -Communication range requirement - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0175] Reference Figure 8 (a) or (b), in step S830, the first UE may receive the PSFCH. For example, the first UE and the second UE may determine the PSFCH resources, and the second UE may send the HARQ feedback to the first UE using the PSFCH resources.

[0176] Reference Figure 8 (a), in step S840, the first UE may send SL HARQ feedback to the base station via PUCCH and / or PUSCH.

[0177] Fig. 9 Three types of broadcasts are shown in accordance with embodiments of the present disclosure. Fig. 9 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig. 9 (a) shows broadcast type SL communication, Fig. 9 (b) in FIG. 4 shows unicast type SL communication, and Fig. 9 (c) shows multicast SL communication. In the case of unicast SL communication, the UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication may be replaced by SL multicast communication, SL one-to-many communication, etc.

[0178] Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.

[0179] For example, SL HARQ feedback may be enabled for unicast. For example, SL HARQ feedback may be enabled for multicast. For example, two HARQ feedback options may be supported for multicast.

[0180] (1) Multicast Option 1: After a receiving UE decodes a PSCCH whose destination is the receiving UE, if the receiving UE cannot decode a transport block associated with the PSCCH, the receiving UE may send a negative acknowledgement (NACK) to the sending UE via the PSFCH. Otherwise, if the receiving UE decodes a PSCCH whose destination is the receiving UE and if the receiving UE successfully decodes a transport block associated with the PSCCH, the receiving UE may not send a positive acknowledgement (ACK) to the sending UE.

[0181] (2) Multicast Option 2: After the receiving UE decodes the PSCCH whose destination is the receiving UE, if the receiving UE cannot decode the transport block associated with the PSCCH, the receiving UE may send a NACK to the sending UE via the PSFCH. Alternatively, if the receiving UE decodes the PSCCH whose destination is the receiving UE and if the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may send an ACK to the sending UE via the PSFCH.

[0182] Hereinafter, the UE procedure for reporting HARQ-ACK on the sidelink will be described.

[0183] Can be in N PSSCH subch The UE is instructed by the SCI format of the scheduled PSSCH reception in one or more of the subchannels to send a PSFCH with HARQ-ACK information in response to the PSSCH reception. The UE provides HARQ-ACK information including ACK or NACK or only NACK.

[0184] The number of slots in the resource pool used for the PSFCH transmission opportunity resource period may be provided to the UE by sl-PSFCH-Period-r16. If this number is zero, PSFCH transmission from the UE in the resource pool is disabled. The UE expects that if kmod N PSFCH PSSCH = 0, then time slot t' k SL (0≤k <T' max ) has PSFCH transmission opportunity resources, where t' k SL is the time slot belonging to the resource pool, T' maxis the number of time slots belonging to the resource pool within 10240 milliseconds, and N PSFCH PSSCH Provided by sl-PSFCH-Period-r16. The UE may be instructed by higher layers not to transmit PSFCH in response to PSSCH reception. If the UE receives PSSCH in a resource pool and the HARQ Feedback Enable / Disable Indicator field in the associated SCI Format 2-A or SCI Format 2-B has a value of 1, the UE provides HARQ-ACK information in the PSFCH transmission in the resource pool. The UE transmits PSFCH in the first slot after at least the number of slots provided by sl-MinTimeGapPSFCH-r16 of the resource pool that includes PSFCH resources and after the last slot of PSSCH reception.

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

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

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

[0188] -N PSFCH type =N PSSCH subch And N PSSCH subch ·M PSFCH subch,slot PRBs and corresponding PSSCH N PSSCH subch One or more sub-channels are associated

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

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

[0191] The UE uses Table 8 to obtain the cyclic shift pair index corresponding to the PSFCH resource index and NPSFCH CS The value of m0 used to calculate the value of the cyclic shift α is determined.

[0192] [Table 8]

[0193]

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

[0195] [Table 9]

[0196] HARQ-ACK value 0(NACK) 1(ACK) Sequential cyclic shift 0 6

[0197] [Table 10]

[0198] HARQ-ACK value 0(NACK) 1(ACK) Sequential cyclic shift 0 N / A

[0199] At the same time, non-contiguous RBs (equidistant) in frequency may be allocated to the UE. This set of non-contiguous RBs may be referred to as interleaved RBs. This may be useful in a spectrum (e.g., shared spectrum) subject to regulations such as occupied channel bandwidth (OCB) and power spectral density (PSD).

[0200] Fig.10 Interleaved RBs based on an embodiment of the present disclosure are shown. Fig.10 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0201] Reference Fig.10 , an interlace of RBs may be defined in the frequency domain. Interlace m∈{0,1,...,M-1} may include (common) RBs{m,M+m,2M+m,3M+m,...}, where M may represent the number of RBs of the interlace given by Table 11.

[0202] [Table 11]

[0203] u M 0 10 1 5

[0204] A communication device (e.g., a device, UE, vehicle, drone, etc. proposed in various embodiments of the present disclosure) can send a signal / channel by using one or more interleaved RBs.

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

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

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

[0208] [Table 12]

[0209]

[0210]

[0211] [Table 13]

[0212]

[0213]

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

[0215] [Table 14]

[0216]

[0217] [Table 15]

[0218]

[0219]

[0220] Meanwhile, channel access type 2, which is a simplified channel access type, may be used within a channel occupancy time (COT) before transmission, and DL transmission may be performed based on the procedure shown in Table 16.

[0221] [Table 16]

[0222]

[0223]

[0224] Meanwhile, channel access type 2, which is a simplified channel access type, may be used within the channel occupancy time (COT) before transmission, and UL transmission may be performed based on the procedure shown in Table 17.

[0225] [Table 17]

[0226]

[0227] In an embodiment of the present disclosure, type 2A SL channel access may be performed in the same manner as type 2A DL and / or UL channel access. For example, type 2A SL channel access may be performed in a sensing interval T_short_sl=25us, where the interval may consist of a duration T_f=16us followed by a sensing slot, and T_f may include a sensing slot at the beginning of T_f. The basic idle (IDLE) determination in type 2A SL channel access may also draw on the IDLE determination from DL or UL channel access.

[0228] In an embodiment of the present disclosure, type 2B SL channel access may be performed in the same manner as type 2B DL ​​and / or UL channel access. For example, in the case of type 2B SL channel access, the UE may perform transmission immediately after sensing that the channel is idle within a duration of T_f=16us. T_f may include a sensing slot occurring within the last 9us of T_f. The basic IDLE determination in type 2B SL channel access may also draw on the IDLE determination from DL or UL channel access.

[0229] In an embodiment of the present disclosure, type 2C SL channel access may be performed in the same manner as type 2C DL and / or UL channel access. For example, in the case of type 2C SL channel access, the UE may not perform channel sensing. Instead, the duration of SL transmission may be at most 584us.

[0230] In an embodiment of the present disclosure, type 1SL channel access may be implemented in the same manner as type 1DL and / or UL channel access. For example, the UE may randomly derive an integer value N based on a contention window size corresponding to a priority level. Then, if the channel sensing result for the delay duration T_d corresponding to the priority level is idle, the UE may reduce the N-1 counter value by T_sl when IDLE. If the value of the counter is zero, the UE may occupy a set of RBs or a channel subjected to channel sensing. If a portion of the channel sensing result for the T_sl duration is determined to be busy, the UE may maintain the counter value until the channel sensing result for the delay duration T_d is idle, and the UE may continue to perform channel sensing. In the above, the delay duration T_d may be composed of T_f=16us and continuous m_p*T_sl after T_f=16us, where m_p may be a value determined by the priority level (p), and T_sl=9us may be a time interval for performing channel sensing.

[0231] Hereinafter, a channel access priority class (CAPC) will be described.

[0232] The CAPC of the MAC CE and radio bearers can be fixed or configured to operate in FR1:

[0233] - Fixed to the lowest priority for filling the Buffer Status Report (BSR) and the bit rate suggested MAC CE;

[0234] -For SRB0, SRB1, SRB3 and other MAC CEs, it is fixed as the highest priority;

[0235] -Configured by the base station for SRB2 and DRB.

[0236] When selecting the CAPC for a DRB, the base station considers fairness between other service types and transmissions while considering the 5QI of all QoS flows multiplexed to the corresponding DRB. Table 10 shows which CAPC should be used for a standardized 5QI, i.e., the CAPC for a given QoS flow. For a standardized 5QI, the CAPC is defined as shown in the following table, and for a non-standardized 5QI, the CAPC with the best QoS characteristics should be used.

[0237] [Table 18]

[0238]

[0239] Table 19 shows the m in DL p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT) and allowed CW size vary according to the channel access priority level.

[0240] [Table 19]

[0241]

[0242] Referring to Table 19, the contention window size (CWS), maximum COT value, etc. of each CAPC can be defined. d Can be equal to T f +m p *T sl (T d =T f +m p *T sl ).

[0243] Table 20 shows the m in UL p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT) and allowed CW size vary according to the channel access priority level.

[0244] [Table 20]

[0245]

[0246] Referring to Table 20, the contention window size (CWS), maximum COT value, etc. of each CAPC can be defined. d Can be equal to T f +m p *T sl (T d =T f +m p *T sl ).

[0247] In an embodiment of the present disclosure, when the UE has occupied a channel through a type 1SL channel access, the UE may not be ready to send a sidelink transmission. In this case, the UE may configure a delay duration of length T_d and a sensing duration of length T_sl immediately before the sidelink transmission that it is ready to send. Here, if both are idle, the UE may perform the sidelink transmission immediately, but if at least one of the delay duration and the sensing duration is busy, the UE may perform type 1SL channel access again. For example, if the sidelink transmission is not possible at the end of channel sensing (for example, if the end of channel sensing is after the start of the sidelink transmission), the UE may reselect the sidelink transmission resource. For example, the reselected resource may be selected by considering the end time of the channel sensing and / or the length of the remaining sensing interval, etc. For example, the remaining sensing interval may be a value derived from assuming that all channel sensings are idle.

[0248] For example, in the present disclosure, a TX UE may be interpreted as: a UE that sends data (e.g., PSCCH / PSSCH) (to the (target) RX UE), and / or a UE that sends a SL CSI-RS (and / or a SL CSI report request indicator) (to the (target) RX UE), and / or a UE that sends a (predefined) RS (e.g., PSSCH DM-RS) to be used for SL (L1) RSRP measurement (and / or SL (L1) RSRP report request indicator) (to the (target) RX UE), and / or a UE that sends a (control) channel (e.g., PSCCH, PSSCH) and / or RS (e.g., DM-RS, CSI-RS) (on the (control) channel) to be used for SL radio link monitoring (RLM) operation (and / or SL radio link failure (RLF) operation) (of the (target) RX UE).

[0249] For example, in the present disclosure, the RX UE may be interpreted as a UE that sends SL HARQ feedback (to the TX UE) based on whether the decoding of the data received from the TX UE is successful (and / or whether the detection / decoding of the PSCCH (related to PSSCH scheduling) sent by the TX UE is successful), and / or a UE that sends SL CSI (to the TX UE) based on the SL CSI-RS (and / or SL CSI report request indicator) received from the TX UE, and / or a UE that sends SL (L1) RSRP measurement value (to the TX UE) based on the (predefined) RS (and / or SL (L1) RSRP report request indicator) received from the TX UE, and / or a UE that sends its own data (to the TX UE), and / or a UE that performs RLM operation (and / or RLF operation) based on the (preconfigured) (control) channel and / or RS (on the (control) channel) received from the TX UE.

[0250] For example, in the present disclosure, the term "PSCCH" may be extended to or interpreted as SCI (and / or the first SCI (or the second SCI) and / or PSSCH), and vice versa. For example, in the present disclosure, the term "SCI" ​​may be extended to or interpreted as PSCCH (and / or the first SCI (or the second SCI) and / or PSSCH), and vice versa. For example, in the present disclosure, the term "PSSCH" may be extended to or interpreted as the second SCI (and / or PSCCH), and vice versa.

[0251] For example, in the present disclosure, the term "configuration / configured (or defined / defined)" may be interpreted as (pre)configuration from a base station (or network) (through predefined signaling (e.g., SIB, MAC, RRC)) (for each resource pool). For example, in the present disclosure, the term "configuration / configured (or defined / defined)" may be interpreted as specified by predefined signaling (e.g., PC5 RRC) between UEs. For example, in the present disclosure, the term "RLF" may be extended to or interpreted as out-of-sync (OOS) and / or in-sync (IS), and vice versa. For example, in the present disclosure, the term "RB" may be extended to or interpreted as a subcarrier, and vice versa. For example, in the present disclosure, the term "packet (or service)" may be extended to or interpreted as a transport block (TB) (or MAC PDU), and vice versa. For example, in the present disclosure, the term "code block group (CBG) (or CG)" may be extended to or interpreted as a TB, and vice versa. For example, in the present disclosure, the term "source ID" may be extended to or interpreted as a "destination ID", and vice versa. For example, in the present disclosure, the term "L1 ID" may be extended to or interpreted as "L2 ID", and vice versa. For example, in the present disclosure, the term "retransmission resource reservation / selection" may be extended to or interpreted as the reservation / selection of potential retransmission resources actually used based on SL HARQ feedback information. For example, in the present disclosure, the term "sub-selection window" may be extended to or interpreted as a selection window (and / or a preconfigured number of resource sets within the selection window), and vice versa. For example, in the present disclosure, "SL mode 1 operation" may refer to a situation where the base station directly schedules SL transmission resources for the UE through predefined signaling (e.g., DCI), and "SL mode 2 operation" may refer to a situation where the UE independently selects SL transmission resources within a preconfigured resource pool (from the base station or the network). For example, in the present disclosure, the term "dynamic grant" may be extended to or interpreted as a configuration (or SPS) grant (or a combination of a configuration (or SPS) grant and a dynamic grant), and vice versa. For example, in the present disclosure, the term "configuration grant" may be extended or interpreted as "configuration grant type 1" (or "configuration grant type 2"), and vice versa. For example, in the present disclosure, the term "channel" may be extended or interpreted as "signal", and vice versa. For example, in the present disclosure, the term "broadcast (type)" may be extended or interpreted as "unicast (and / or multicast and / or broadcast)", and vice versa. For example, in the present disclosure, the term "resource" may be extended or interpreted as "time slot" (or "symbol"), and vice versa.For example, in the present disclosure, the term "priority" may be extended to or interpreted as "logical channel prioritization (LCP)" (and / or "latency" and / or "reliability" and / or "minimum required communication range" and / or "prose per-packet priority (PPP)" and / or "priority" and / or "SLRB" and / or "QoS profile / parameters" and / or "requirements") and vice versa.

[0252] Meanwhile, a channel occupancy time (COT) for transmission may be supported based on simplified channel sensing (e.g., type 2 LBT) in an unlicensed band. For example, a UE may obtain / generate a COT and share the COT with another UE. In the present disclosure, a UE that obtains / generates a COT may be referred to as a COT initiating UE, and a UE that receives a shared COT (e.g., a UE that receives information related to the COT from a COT initiating UE) may be referred to as a COT responding UE. In this case, for example, a simplified channel access type 2 within the COT may be used before transmission.

[0253] As described above, unlike in a licensed band, in an unlicensed band, the UE should perform LBT before transmission. If the transmission probability of SL HARQ feedback information is greatly affected by the LBT operation, it may be difficult to effectively meet the service-related requirements within the system. For example, if ACK information transmission is skipped due to LBT failure, unnecessary retransmissions may occur and the interference level of the system may increase. For example, if NACK information transmission is skipped due to LBT failure in HARQ feedback based on NACK only, retransmissions may not be guaranteed and the reliability of SL communication may deteriorate.

[0254] Specifically, the UE may detect a high probability of LBT failure in channel access type 1 (e.g., type 1 LBT) compared to channel access type 2 (e.g., type 2 LBT). Therefore, the probability of skipping SL HARQ feedback transmission based on channel access type 1 (e.g., type 1 LBT) may be higher than the probability of skipping SL HARQ feedback transmission based on channel access type 2 (e.g., type 2 LBT). If the probability of transmitting SL HARQ feedback information is reduced due to LBT operation, it may be difficult to effectively meet service-related requirements within the system. For example, if ACK information transmission is skipped due to LBT failure, unnecessary retransmissions may occur and the interference level of the system may increase. For example, if NACK information transmission is skipped due to LBT failure in HARQ feedback based on NACK only, retransmissions may not be guaranteed and the reliability of SL communication may deteriorate.

[0255] Based on various embodiments of the present invention, a method for UE to perform channel access for PSFCH transmission in an unlicensed frequency band and a device supporting the method are proposed. In the present disclosure, channel access type 1 can be referred to by various terms such as type 1 channel access, first type channel access, random backoff-based channel access, etc., and channel access type 2 can be referred to by various terms such as type 2 channel access, second type channel access, deterministic duration channel access, etc.

[0256] For example, when SL communication is performed in an unlicensed band, the channel access type when multiple PSFCHs are sent simultaneously can be configured to be determined based on (part or all of) the following rules.

[0257] For example, multiple PSFCH opportunities corresponding to the same PSSCH time slot may be configured. Multiple PSFCH opportunities may exist in the same time slot and / or may exist in different time slots.

[0258] For example, if the UE receives a shared COT from another UE and / or if the UE performs PSFCH transmission to the COT initiating UE in a specific PSFCH opportunity (after successful LBT), the UE may attempt transmission based on the type 2 series channel access procedure in other PSFCH opportunities within the COT duration for PSFCH transmission. For example, the PSFCH transmission in other PSFCH opportunities may not include the PSFCH sent to the COT initiating UE. For example, in the above, other PSFCH opportunities may be limited to those PSFCH opportunities after the PSFCH opportunity at which the PSFCH transmission is successfully performed to the COT initiating UE.

[0259] Fig.11 A method for a COT responding UE to perform PSFCH transmission to a COT initiating UE and / or another UE based on channel access type 2 according to an embodiment of the present disclosure is shown. Fig.11 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0260] Reference Fig.11, the COT responding UE may receive a first PSCCH / PSSCH from a UE other than the COT initiating UE, and the COT responding UE may receive a second PSCCH / PSSCH from the COT initiating UE within the COT duration. Here, it is assumed that the PSFCH for the first PSCCH / PSSCH and the PSFCH for the second PSCCH / PSSCH are associated with the same PSFCH opportunity, and the PSFCH opportunity is within the COT. In this case, the COT responding UE may determine whether the channel is idle based on channel access type 2 before sending the PSFCH for the COT initiating UE and the PSFCH for the UE other than the COT initiating UE. In this case, channel access type 2 instead of channel access type 1 may be used for PSFCH transmission of UEs other than the COT initiating UE.

[0261] Fig.12 A method for a COT responding UE to perform PSFCH transmission to a COT initiating UE and / or another UE based on channel access type 2 according to an embodiment of the present disclosure is shown. Fig.12 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0262] Reference Fig.12 , the COT responding UE may receive a first PSCCH / PSSCH from a UE other than the COT initiating UE, and the COT responding UE may receive a second PSCCH / PSSCH from the COT initiating UE within the COT duration. Here, it is assumed that the PSFCH for the first PSCCH / PSSCH is associated with the first PSFCH opportunity, and the PSFCH for the second PSCCH / PSSCH is associated with the second PSFCH opportunity, and the first PSFCH opportunity and the second PSFCH opportunity are within the COT. In this case, the COT responding UE may determine whether the channel is idle based on channel access type 2 before PSFCH transmission for the COT initiating UE (i.e., before the second PSFCH opportunity), and the COT responding UE may determine whether the channel is idle based on channel access type 2 before PSFCH transmission for UEs other than the COT initiating UE (i.e., before the first PSFCH opportunity). In this case, channel access type 2 instead of channel access type 1 may be used for PSFCH transmission of UEs other than the COT initiating UE.

[0263] Fig.13 A method for a COT responding UE to perform PSFCH transmission to a COT initiating UE and / or another UE based on channel access type 2 according to an embodiment of the present disclosure is shown. Fig.13 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0264] Reference Fig.13 , the COT responding UE may receive the second PSCCH / PSSCH from the COT initiating UE within the COT duration, and the COT responding UE may receive the first PSCCH / PSSCH from a UE other than the COT initiating UE within the COT duration. Here, it is assumed that the PSFCH for the first PSCCH / PSSCH is associated with the first PSFCH opportunity, and the PSFCH for the second PSCCH / PSSCH is associated with the second PSFCH opportunity, and the first PSFCH opportunity and the second PSFCH opportunity are within the COT. In this case, the COT responding UE may determine whether the channel is idle based on channel access type 2 before PSFCH transmission for the COT initiating UE (i.e., before the second PSFCH opportunity), and the COT responding UE may determine whether the channel is idle based on channel access type 2 before PSFCH transmission for UEs other than the COT initiating UE (i.e., before the first PSFCH opportunity). In this case, channel access type 2 instead of channel access type 1 may be used for PSFCH transmission of UEs other than the COT initiating UE.

[0265] For example, in an embodiment of the present disclosure, the SL channel sent to the COT initiating UE is limited to PSFCH, but the concept of the present disclosure can be extended to other SL channels (e.g., PSCCH / PSSCH and / or S-SSB). For example, in an embodiment of the present disclosure, the SL channel sent to UEs other than the COT initiating UE is limited to PSFCH, but the concept of the present disclosure can be extended to other SL channels (e.g., PSCCH / PSSCH and / or S-SSB).

[0266] For example, if type 2 channel access is indicated and / or configured / determined for PSFCH transmission, or if type 2 channel access is performed, and / or if the result of type 2 channel access is busy, the UE may perform type 1 channel access for PSFCH transmission in the next PSFCH opportunity.

[0267] For example, if type 2 channel access is indicated and / or configured / determined for PSFCH transmission, or if type 2B channel access is performed, and / or if the result of type 2 channel access is busy, the UE may perform type 2A channel access for PSFCH transmission in the next PSFCH opportunity.

[0268] For example, when the UE transmits a plurality of PSFCHs, the channel access type for each PSFCH may be differently configured / determined and / or indicated.

[0269] For example, the UE may perform a channel access procedure for each PSFCH, and the UE may determine whether to transmit for each PSFCH.

[0270] For example, if the UE is configured or instructed to perform type 2 channel access for at least one of multiple PSFCH transmissions, the UE may perform type 2 channel access and determine whether to transmit multiple PSFCHs.

[0271] For example, if the UE is configured or instructed to perform Type 2A channel access for at least one of multiple PSFCH transmissions, the UE may perform Type 2A channel access and determine whether to transmit multiple PSFCHs.

[0272] For example, if the UE is configured or instructed to perform Type 2B channel access for at least one of multiple PSFCH transmissions, the UE may perform Type 2B channel access and determine whether to transmit multiple PSFCHs.

[0273] For example, if the UE is configured or instructed to perform Type 2C channel access for at least one of multiple PSFCH transmissions, the UE may perform Type 2C channel access and determine whether to transmit multiple PSFCHs.

[0274] For example, the UE may select type 2A / 2B / 2C channel access for each PSFCH transmission based on the type gap between previous SL transmissions and / or receptions, and / or the UE may select type 2A / 2B / 2C channel access differently for each PSFCH transmission, and / or the UE may select the channel access type to be performed for PSFCH transmissions within the same RB set as a channel access type determined / configured based on the longest type gap or the shortest type gap. For example, for multiple PSFCH transmissions within the same RB set, the UE may select one of the type 2A / 2B / 2C channel accesses based on the UE's selection and / or the length of the transmission time interval and / or the shortest length or the longest length of each type gap, etc. For example, for multiple PSFCH transmissions within the same RB set, the UE may select one of the type 2A / 2B / 2C channel accesses based on the type gap of the PSFCH used to initiate the UE transmission to the COT or the channel access type configured for the PSFCH. For example, the UE may skip the transmission of a PSFCH (within the same RB set) that is equal to or greater than the CAPC value of the PSFCH transmitted to the COT initiating UE.

[0275] For example, in the case where the UE simultaneously sends PSFCH transmissions within the same RB set, the type gaps between previous SL transmissions and / or receptions may all be the same.

[0276] For example, in an embodiment of the present disclosure, the type gap may be measured based on the interval between the end of the previous sidelink transmit and / or receive resources and the start of the PSFCH transmission (with or without cyclic prefix extension (CPE)). For example, the previous sidelink transmit and / or receive resources may share the same COT used for PSFCH transmission. For example, the previous sidelink transmit and / or receive resources may be used to transmit to and / or receive from the UE that generated the COT.

[0277] For example, in PSFCH transmission, if the UE (that has received the shared COT) cancels / skips all or part of the PSFCH to be sent to the UE that has initialized the COT (through the SL prioritization process, etc.), the UE that sends the PSFCH can perform a type 1 channel access process for the (remaining) PSFCH transmission. For example, in PSFCH transmission, if the UE (that has received the shared COT) cancels / skips all or part of the PSFCH to be sent to the UE that has initialized the COT (through the SL prioritization process, etc.), the UE that sends the PSFCH can skip the (remaining) PSFCH transmission. For example, in PSFCH transmission, even if the UE (that has received the shared COT) cancels / skips all or part of the PSFCH to be sent to the UE that has initialized the COT (through the SL prioritization process, etc.), the UE that sends the PSFCH can perform a type 2 channel access process for the (remaining) PSFCH transmission. This is because there may not be enough time to perform a type 1 channel access process after the SL prioritization process. For example, based on the CAPC value and / or SL priority value for the PSFCH, the operation when the PSFCH transmitted to the COT initiating UE is skipped may be different. For example, if the CAPC value is less than or equal to a certain level (e.g., 1), the UE may perform a type 1 channel access procedure, otherwise, the UE may skip the remaining PSFCH transmissions. For example, when a UE (that has received a shared COT) performs PSFCH transmission, if there is no PSFCH transmitted to the UE that has initialized the COT (even before the SL prioritization process) and / or if the type 1 channel access procedure is configured or indicated for all PSFCH transmissions, the UE may perform a type 1 channel access procedure. For example, when a UE (that has received a shared COT) performs PSFCH transmission, it may preferentially include all or part of the PSFCH transmitted to the UE that has initialized the COT in the transmission candidates. For example, the SL priority may be higher, and / or the SL priority of the PSFCH sent to UEs other than the COT initiating UE may be the same or lower, and / or the SL priority of the PSFCH sent to UEs other than the COT initiating UE may be lower than the SL priority of the PSFCH sent to the COT initiating UE. For example, for PSFCH transmission and / or reception with the same SL priority, the UE may prioritize the PSFCH sent to the COT initiating UE over other PSFCHs. For example, the UE may prioritize the PSFCH transmission sent to the COT initiating UE over PSFCH reception. For example, the UE may determine PSFCH transmission and / or reception based on the SL priority, and / or if PSFCH transmission is determined, the UE may select the PSFCH to be sent based on whether the PSFCH is sent to the COT initiating UE.

[0278] For example, for multiple PSFCH transmissions, the UE may perform channel access based on the channel access type of the PSFCH transmission corresponding to the maximum SL priority value and / or the maximum CAPC value, and the UE may determine whether to transmit multiple PSFCHs. For example, this operation may be used only when there is no PSFCH (within the same RB set) transmitted by the COT initiating UE or it is discarded.

[0279] For example, when the UE transmits multiple PSFCHs for different RB sets, if the PSFCHs are mapped to RBs corresponding to the same interlace (group) of the RB set, the PSFCH transmission may be allowed. For example, a portion of the PSFCH transmission (and / or reception) may be skipped to ensure the same interlace group for different RB sets. For example, in the case of omitting PSFCH transmission (and / or reception) as described above, the PSFCH with a higher priority value may be skipped first.

[0280] For example, when multiple PSFCHs are sent through multiple RB sets, the UE may preferentially send the PSFCH mapped to the RB corresponding to the interlace of the PSFCH with the highest priority. For example, in the case where the UE can send more PSFCHs, the UE may send the PSFCH mapped to the RB corresponding to the interlace of the next priority.

[0281] For example, when multiple PSFCHs are transmitted through multiple RB sets, the UE may transmit RBs corresponding to the interlaces used for PSFCH transmission together in the guard region between adjacent RB sets. For example, in this case, a repetition of a portion of a sequence belonging to a lower index RB set or a repetition of a portion of a sequence belonging to a higher index RB set and / or a version to which an additional cyclic shift is applied and / or an arbitrary sequence (for reducing the peak-to-average power ratio (PAPR)) may be mapped to the RB.

[0282] For example, the UE may perform LBT for the PSFCH TX determined after PSFCH TX / RX conflict processing (based on a predefined prioritization rule) and determine whether to perform final transmission. For example, the UE may prioritize the PSFCH TX with a relatively high priority among the PSFCH TXs for which LBT is successful. For example, if LBT for PSFCH TX fails, the UE may perform PSFCH RX.

[0283] For example, the UE may perform LBT before PSFCH TX / RX conflict handling (based on a predefined prioritization rule), and perform PSFCH TX if idle is determined. For example, the UE may prioritize PSFCH TX with a relatively high priority among PSFCH TXs for which LBT is successful.

[0284] For example, if the UE determines PSFCH TX based on PSFCH TX / RX conflict handling (based on a predefined prioritization rule), the UE may perform LBT and prioritize the PSFCH TX for which LBT succeeds compared to the priority.

[0285] For example, the order of PSFCH TX / RX conflict handling and LBT operation (based on predefined prioritization rules) can vary depending on the PSFCH timing or the number of PSFCH transmission attempts. For example, during an initial transmission attempt, PSFCH TX / RX conflict handling (based on predefined prioritization rules) can precede LBT operation, and / or during subsequent transmission attempts, LBT operation can precede PSFCH TX / RX conflict handling (based on predefined prioritization rules).

[0286] For example, PSFCH TX / RX conflict handling can be based on the number of PSFCH transmission attempts (in addition to the SL priority value). For example, when determining the priority among PSFCHs with the same SL priority, a PSFCH with a larger number of PSFCH transmission attempts can have a higher priority. For example, when determining the priority among PSFCHs with the same SL priority, a PSFCH with a larger number of PSFCH transmission attempts can have a lower priority. For example, a PSFCH with a larger number of transmission attempts can have a higher SL priority than a PSFCH with a smaller number of transmission attempts. For example, a threshold value for the number of transmission attempts can be (pre-)configured for each priority combination, and / or if the number of transmission attempts is greater than or equal to the threshold, its priority can be higher than a PSFCH with a corresponding priority value. For example, the UE can preferentially include the PSFCH that was attempted to be transmitted in the previous PSFCH opportunity in the PSFCH opportunity that can be transmitted in the current PSFCH opportunity.

[0287] For example, in the case where there are multiple PSFCH opportunities for each PSCCH / PSSCH, a UE that has received a PSCCH / PSSCH may send a PSFCH for the received PSCCH / PSSCH in all or part of the multiple PSFCH opportunities.

[0288] Fig.14 An example of having multiple PSFCH opportunities for each PSCCH / PSSCH according to an embodiment of the present disclosure is shown. Fig.14 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0289] Reference Fig.14 , multiple PSFCH opportunities can be associated with one PSCCH / PSSCH.

[0290] For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be different per resource pool. For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be different per SL priority. For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be different per congestion control level. For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be different per LBT failure rate. For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be different per transmit power (whether the transmit power reaches the maximum transmit power value). For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be different per PSFCH simultaneous transmission number (whether the PSFCH simultaneous transmission number reaches the maximum number of PSFCH simultaneous transmissions). For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be (pre) configured per resource pool. For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be (pre) configured per SL priority. For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be (pre) configured per congestion control level. For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be (pre)configured according to the LBT failure rate. For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be (pre)configured according to each transmission power (whether the transmission power reaches the maximum transmission power value). For example, whether the PSFCH is repeatedly sent and / or the number of transmissions may be (pre)configured according to the number of simultaneous PSFCH transmissions (whether the number of simultaneous PSFCH transmissions reaches the maximum number of simultaneous PSFCH transmissions).

[0291] For example, in the case of multiple PSFCH opportunities for each PSCCH / PSSCH, if LBT for PSFCH transmission fails and / or if PSFCH transmission is discarded due to PSFCH TX / RX conflict handling, the UE may retry PSFCH transmission at the next PSFCH opportunity. For example, for the case where LBT for PSFCH transmission fails and / or for the case where PSFCH transmission is discarded due to PSFCH TX / RX conflict handling, the (maximum) number of transmission attempts may be (pre-)configured jointly and / or individually.

[0292] For example, when multiple PSFCHs are transmitted, the transmit power (per PSFCH) (and / or the total transmit power associated with the PSFCH transmissions) may be determined / calculated based on the number of transmissions scheduled before the transmission is canceled based on the LBT results.

[0293] For example, when multiple PSFCHs are transmitted, the transmission power (per PSFCH) (and / or the total transmission power associated with the PSFCH transmission) can be changed / determined based on the actual number of transmissions that are canceled according to the LBT results.

[0294] For example, when sending multiple PSFCHs, the UE may select PSFCH transmissions that are equal to or less than the maximum number of PSFCH transmissions of the UE per RB set. For example, if the UE determines that multiple RB sets are idle, and / or if the total number of PSFCH transmissions selected in multiple RB sets exceeds the maximum number of PSFCH transmissions (supportable by the UE), the UE may send PSFCH transmissions in the RB set including the PSFCH with the smallest SL priority value and may skip PSFCH transmissions in the remaining RB sets, and / or the UE may send PSFCH transmissions in the RB set with a larger number of PSFCHs and may skip PSFCH transmissions in the remaining RB sets.

[0295] In an embodiment of the present disclosure, indicating type 2 channel access may refer to indicating at least one of type 2A and / or type 2B and / or type 2C.

[0296] In an embodiment of the present disclosure, performing type 2 channel access may refer to performing at least one of type 2A and / or type 2B and / or type 2C.

[0297] In an embodiment of the present disclosure, the receiving UE or the corresponding source ID for each PSFCH may be different.

[0298] In the embodiments of the present disclosure, PSFCH transmissions may all be used for the same TB. That is, in the above case, there may be a situation where the UE receiving the PSSCH attempts to transmit again after the PSFCH transmission fails.

[0299] In an embodiment of the present disclosure, after determining the PSFCH to be sent based on the priority, the UE may perform channel sensing for the PSFCH. In an embodiment of the present disclosure, before determining the PSFCH to be sent based on the priority, the UE may perform channel sensing for the PSFCH, and if necessary, the UE may determine the PSFCH actually to be sent based on the priority.

[0300] In an embodiment of the present disclosure, in channel sensing, a threshold value determined based on a maximum value transmitted based on a single PSFCH, a (pre)configured reference power value, or a maximum power value transmitted for multiple PSFCHs may be used. For example, when the UE assumes up to N PSFCH transmissions, the maximum value transmitted based on a single PSFCH may be a value determined based on a value obtained by dividing the UE's maximum power P, etc. by N.

[0301] In an embodiment of the present disclosure, the determination of the channel access type may be performed for each RB set, and / or the channel access type of the RB set may be determined only for PSFCH transmission within the RB set.

[0302] In an embodiment of the present disclosure, multiple PSFCH transmissions may be performed on (different) multiple RB sets.

[0303] Embodiments of the present disclosure (and / or whether rules and / or parameter values ​​are applied) may be different and / or (pre-)configured per resource pool and / or per transmission outside and / or inside a resource pool and / or per QoS parameter (e.g., latency, priority, reliability, minimum communication range) and / or per CAPC and / or per SL priority and / or per COT inside or outside (when the COT is initialized) and / or per transmission order within a multi-continuous time slot transmission (MCST) and / or per SL channel type and / or per RB set and / or per SL BWP and / or per SL carrier and / or per congestion control level and / or per transmit operation or receive operation and / or per transmit power level and / or per transmit start time and / or per channel access procedure type for transmission and / or per LBT failure rate and / or per COT initiating UE or COT responding UE or other UE and / or per broadcast type and / or per SL HARQ-ACK feedback enabled or SL HARQ-ACK feedback disabled and / or per SL HARQ-ACK feedback option and / or number of attempts per transmission for the same information or TB. For example, the (pre) configuration (and / or whether to apply rules and / or parameter values) of the embodiments of the present disclosure can be performed according to the following items: per resource pool and / or per transmission outside and / or inside a resource pool and / or per QoS parameter and / or per CAPC and / or per SL priority and / or per transmission order within or outside the COT (when the COT is initialized) and / or per MCST and / or per SL channel type and / or per RB set and / or per SL BWP and / or per SL carrier and / or per congestion control level and / or per transmission operation or reception operation and / or per transmission power level and / or per transmission start time and / or per channel access procedure type for transmission and / or per LBT failure rate and / or per COT initiating UE or COT responding UE or other UE and / or per broadcast type and / or per SL HARQ-ACK feedback enabling or SL HARQ-ACK feedback disabling and / or per SL HARQ-ACK feedback option and / or per number of transmission attempts for the same information or TB.

[0304] For example, whether to apply the above-mentioned rules (and / or parameter values ​​related to the proposed method of the present disclosure) can be specifically (or differently or independently) configured / allowed based on at least one of the following elements / parameters (or for each of the following elements / parameters) (and / or the above-mentioned rules can be configured / allowed to be applied in a limited manner), and the elements / parameters include: service type (and / or (LCH or service) priority) and / or QoS requirements (e.g., latency, reliability, minimum communication range) and / or PQI parameters (and / or HARQ feedback enabling (and / or disabling) LCH / MAC PDU (transmission) and / or CBR measurement value of resource pool and / or SL broadcast type (e.g., unicast, multicast, broadcast) and / or SL groupcast HARQ feedback options (e.g., NACK feedback only, ACK / NACK feedback, NACK feedback only based on TX-RX distance) and / or SL mode 1CG type (e.g., SL CG type 1 / 2) and / or SL mode type (e.g., mode 1 / 2) and / or resource pool and / or whether PSFCH resource is configured for resource pool and / or whether periodic resource reservation operation (and / or aperiodic resource reservation operation) is allowed / configured for (or not allowed / configured for) resource pool and / or whether partial sensing operation (and / or random resource selection operation (and / or full sensing operation)) is allowed / configured for (or not allowed / configured for) resource pool and / or source (L2) ID (and / or destination (L2) ID) and / or PC5 RRC connection link and / or SL link and / or connection status (with base station) (e.g.,RRC connected (RRCCONNECTED) state, RRC idle (RRC IDLE) state, RRC inactive (RRC INACTIVE) state) and / or SL HARQ process (ID) and / or whether the SL DRX operation (of the TX UE or RX UE) is performed and / or whether it is a power saving (TX or RX) UE and / or (from the perspective of a specific UE) a case where PSFCH TX and PSFCH RX (and / or multiple PSFCH TX (exceeding UE capability)) overlap (and / or PSFCH TX (and / or PSFCH RX) skipping) and / or a case where the RX UE actually (successfully) receives PSCCH (and / or PSSCH) (re)transmission from the TX UE and / or a case where the (TX) UE that performs packet transmission (and / or transmission resource (re)selection) performs a power saving operation (and / or SL DRX operation) and / or a case where the target (RX) UE of packet transmission performs a power saving operation (and / or SL DRX operation) and / or the case where the remaining PDB value related to packet transmission is greater than or equal to (or less than or equal to) a preconfigured threshold and / or the case of initial transmission (and / or retransmission) (related to TB) and / or the case of applying an interleaved (RB) structure and / or the case of performing a (preconfigured) channel access type (e.g., type 1, type 2A, type 2B, type 2C, semi-static channel occupancy) and / or the case of sending / receiving a (preconfigured) SL channel / signal (e.g., SL SSB, PSCCH, PSSCH, PSFCH) and / or an RB set (and / or channel and / or carrier) (on which a channel access operation is performed in an unlicensed band) and / or a channel occupancy time (COT) and / or a TX burst and / or a discovery burst. In addition, a combination of the proposed methods (and / or proposed rules and / or implementations) described in the present disclosure may be applied. In addition, in the present disclosure, the term "configuration / configured" (or "specified / specified") can be extended to or interpreted as a form in which the base station notifies the UE through a predefined (physical layer or upper layer) channel / signal (e.g., SIB, RRC, MAC CE) (and / or a form provided by preconfiguration and / or a form in which the UE notifies another UE through a predefined (physical layer or upper layer) channel / signal (e.g., SL MAC CE, PC5 RRC)). In addition, the term "PSFCH" in the present disclosure can be extended to or interpreted as "(NR or LTE) PSSCH (and / or (NR or LTE) PSCCH) (and / or (NR or LTE) SL SSB (and / or UL channel / signal))" (or vice versa). In addition, the proposed methods of the present disclosure can be combined with each other and extended (in a new form). In addition, in the present disclosure,The term "active time" (and / or "on duration") may be extended or interpreted as "on duration" (and / or "active time") (or vice versa).

[0305] In an embodiment of the present disclosure, a method for determining a contention window size may be a combination of multiple methods. For example, if there are multiple SL HARQ-ACK feedback groups for reference, if the determination result based on the representative HARQ-ACK value of each group is not to maintain the CW_p value for all or each CAPC, the UE may increase the CW_p value for all or each CAPC to the next allowed value and / or reset the CW_p value to the initial value. For example, if multiple factors are referenced when setting the contention window size, and the result of determining each factor is to increase the CW_p value to the next allowed value and to maintain or reset the CW_p value, the UE may maintain the CW_p value and / or reset the CW_p value to the minimum value. For example, if multiple factors are referenced when setting the contention window size, and the result of determining each factor is to increase the CW_p value to the next allowed value and to maintain or reset the CW_p value, the UE may increase the CW_p value to the next allowed value.

[0306] In an embodiment of the present disclosure, the PSCCH / PSSCH referenced when determining the contention window size may be received within a specific duration. For example, the specific duration may be within the fastest SL channel occupancy duration since the last CW_p updated by the UE.

[0307] In an embodiment of the present disclosure, the operation of initializing to the minimum value may be replaced by another specific value (eg, a (preconfigured) value), and / or the specific value may be configured differently depending on factors for adjusting the contention window size.

[0308] In an embodiment of the present disclosure, the reference duration may be the following duration, i.e., starting from the channel occupancy of the COT (for sidelink communication) obtained by the UE and / or the COT (for sidelink communication) obtained by the base station, to the end of the first time slot in which actual specific sidelink transmission is performed for all resources allocated for sidelink transmission, or to the end of the first transmission burst including actual specific sidelink transmission for all resources allocated for sidelink transmission, or to the earlier end time of the above end times. For example, the specific sidelink transmission may be PSCCH / PSSCH transmission for unicast and / or multicast and / or PSCCH / PSSCH for enabling SL HARQ-ACK feedback. For example, when the COT is initialized, the length of the reference duration may be (pre)configured according to the per-SL priority value of the SL transmission per resource pool and / or UE.

[0309] In the embodiments of the present disclosure, different combinations of the above may be used depending on whether the COT duration is initiated by the UE or the base station.

[0310] In an embodiment of the present disclosure, adjusting the contention window size for the side link may be performed as follows: per unicast session (group) and / or per broadcast type and / or per transmission priority value and / or per SL transmission enabling / disabling SL HARQ-ACK feedback and / or per SL HARQ-ACK feedback option. For example, the first UE may perform a process of adjusting the contention window size for SL transmission from the first UE to the second UE and for SL transmission from the first UE to the third UE, respectively. For example, when adjusting the contention window size based on HARQ-ACK, HARQ-ACK may be limited to a specific broadcast type and / or a specific unicast session.

[0311] In an embodiment of the present disclosure, adjusting the contention window size for the side link may be performed based only on a specific broadcast type (eg, unicast or groupcast) and / or a PSSCH with SL HARQ-ACK feedback enabled.

[0312] In an embodiment of the present disclosure, initializing the CW_p value to the corresponding minimum value may be replaced by reducing the CW_p value to the previously allowed value.

[0313] For example, in Type 1 SL channel access, the contention window size may be (pre)configured per priority level and / or per SL priority and / or per resource pool. For example, in the above case, adjusting the contention window size may not be performed by the UE.

[0314] In an embodiment of the present disclosure, the threshold used to determine whether a channel is busy or idle when performing channel sensing according to the channel access type can be predefined and / or (pre) configured as follows: per resource pool and / or per SL BWP and / or per RB set and / or per carrier and / or per SL transmission priority and / or per representative transmission power value (range) and / or per congestion control level.

[0315] Embodiments of the present disclosure may be applied in any combination of the above, depending on whether the transmission is within or outside the channel occupancy time (COT). Embodiments of the present disclosure may be applied in any combination of the above, depending on the form of the COT (e.g., whether it is semi-static or time-varying). For example, a semi-static COT may be configured when it is guaranteed that there are no other technologies sharing the same channel or RB set within a certain time (such as by regulation). For example, in the case of SL transmission, a semi-static COT may be configured when it is guaranteed that there are no DL and / or UL transmissions sharing the same channel or RB set within a certain time (such as by regulation). For example, in the case of DL and / or UL transmission, a semi-static COT may be configured when it is guaranteed that there are no SL transmissions sharing the same channel or RB set within a certain time (such as by regulation). For example, a semi-static COT may be configured when it is guaranteed that there are no SL transmissions sharing the same channel or RB set within a certain time (such as by regulation). For example, a semi-static COT may be configured when it is guaranteed that there are no SL transmissions based on SL mode 2 resource (re)selection sharing the same channel or RB set within a certain time (such as by regulation). For example, the length and / or time domain offset value of the fixed frame period (FFP) of the semi-static COT duration can be (pre) configured per resource pool and / or per SL BWP and / or per carrier and / or per RB set and / or per congestion control level and / or per SL transmission priority value. For example, the length and / or time domain offset value of the fixed frame period (FFP) of the semi-static COT duration can be configured by PC5-RRC signaling between UEs. For example, the (pre) configured FFP can be overwritten by PC5-RRC signaling. For example, the FFP configured by PC5-RRC can be used only for unicast transmission corresponding to the PC5-RRC connection. The embodiments of the present disclosure may be applied differently in any combination of the above, depending on the carrier, with or without protection between RB sets, or regulations.

[0316] Although the embodiments of the present disclosure describe changing the contention window size for all CAPCs, the concept of the present disclosure can be extended to include changing the contention window size for each specific CAPC or SL priority value.

[0317] In an embodiment of the present disclosure, the channel access type and indication / method may be applied differently for each SL channel. In an embodiment of the present disclosure, the channel access type and indication / method may be applied differently depending on the type of information included in the SL channel.

[0318] Fig.15 A method for a first device to perform wireless communication based on an embodiment of the present disclosure is shown. Fig.15 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0319] Reference Fig.15, in step S1510, the first device may receive information related to a channel occupancy time (COT) from the second device. In step S1520, the first device may receive a first physical sidelink shared channel (PSSCH) from the second device. In step S1530, the first device may determine a first PSFCH resource for a first physical sidelink feedback channel (PSFCH) transmission related to the first PSSCH. In step S1540, the first device may perform a second type of channel access for the first PSFCH transmission within the COT. For example, the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0320] For example, the second type of channel access may include at least one of channel access during a 25 microsecond sensing interval, channel access during a 16 microsecond sensing interval, or channel access without sensing.

[0321] For example, the first type of channel access based on random backoff may be performed outside of the COT.

[0322] For example, the second type channel access may be performed during a time interval before a first PSFCH resource for a first PSFCH transmission and a time interval before a second PSFCH resource for a second PSFCH transmission.

[0323] For example, a time domain of a first PSFCH resource used for a first PSFCH transmission and a time domain of a second PSFCH resource used for a second PSFCH transmission may be within the COT.

[0324] For example, a first PSFCH resource used for a first PSFCH transmission and a second PSFCH resource used for a second PSFCH transmission may be within different PSFCH opportunities.

[0325] For example, the second PSFCH resources used for the second PSFCH transmission may follow the first PSFCH resources used for the first PSFCH transmission in the time domain.

[0326] For example, the first PSSCH may be received from the second device within the COT.

[0327] For example, based on that a first PSFCH transmission among multiple PSFCH transmissions within a set of resource blocks (RBs) associated with a COT shared from a second device is for the second device, the second type channel access may be allowed for multiple PSFCH transmissions.

[0328] For example, the type of the second type of channel access may be selected based on the shortest time gap between multiple PSFCH transmissions and multiple PSSCH receptions within the RB set.

[0329] For example, the type of the second type of channel access may be selected based on a longest time gap between multiple PSFCH transmissions and multiple PSSCH receptions within a set of RBs.

[0330] In addition, for example, the first device may determine a transmit power for a plurality of PSFCH transmissions including the first PSFCH transmission. For example, based on skipping at least one PSFCH transmission due to a listen-before-talk (LBT) failure among the plurality of PSFCH transmissions, the transmit power of one or more PSFCH transmissions excluding at least one PSFCH transmission from the plurality of PSFCH transmissions may be determined based on the number of the plurality of PSFCH transmissions.

[0331] The proposed method can be applied to devices based on various embodiments of the present disclosure. First, the processor 102 of the first device 100 can control the transceiver 106 to receive information related to the channel occupancy time (COT) from the second device. In addition, the processor 102 of the first device 100 can control the transceiver 106 to receive a first physical side link shared channel (PSSCH) from the second device. In addition, the processor 102 of the first device 100 can determine a first PSFCH resource for a first physical side link feedback channel (PSFCH) transmission related to the first PSSCH. In addition, the processor 102 of the first device 100 can perform a second type of channel access for the first PSFCH transmission within the COT. For example, the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0332] Based on the embodiments of the present disclosure, a first device suitable for performing wireless communication may be provided. For example, the first device may include: at least one transceiver; at least one processor; and at least one memory connected to at least one processor and storing instructions. For example, the instructions may enable the first device to perform operations including the following items based on being executed by at least one processor: receiving information related to channel occupancy time (COT) from a second device; receiving a first physical sidelink shared channel (PSSCH) from a second device; determining a first PSFCH resource for a first physical sidelink feedback channel (PSFCH) transmission related to the first PSSCH; and performing a second type of channel access for the first PSFCH transmission within the COT. For example, the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0333] Based on the embodiments of the present disclosure, a processing device suitable for controlling a first device may be provided. For example, the processing device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, the instructions may enable the first device to perform operations including the following items based on being executed by at least one processor: receiving information related to a channel occupancy time (COT) from a second device; receiving a first physical sidelink shared channel (PSSCH) from a second device; determining a first PSFCH resource for a first physical sidelink feedback channel (PSFCH) transmission related to the first PSSCH; and performing a second type of channel access for the first PSFCH transmission within the COT. For example, the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0334] Based on the embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, when the instructions are executed, a first device may perform operations including: receiving information related to a channel occupancy time (COT) from a second device; receiving a first physical sidelink shared channel (PSSCH) from a second device; determining a first PSFCH resource for a first physical sidelink feedback channel (PSFCH) transmission related to the first PSSCH; and performing a second type of channel access for the first PSFCH transmission within the COT. For example, the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0335] Fig.16 A method for a second device to perform wireless communication based on an embodiment of the present disclosure is shown. Fig.16 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0336] Reference Fig.16 , in step S1610, the second device may send information related to a channel occupancy time (COT) to the first device. In step S1620, the second device may send a first physical sidelink shared channel (PSSCH) to the first device. In step S1630, the second device may determine a first PSFCH resource for receiving a first physical sidelink feedback channel (PSFCH) related to the first PSSCH. For example, a second type of channel access for the transmission of the first PSFCH within the COT may be performed by the first device, and the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0337] The proposed method can be applied to devices based on various embodiments of the present disclosure. First, the processor 202 of the second device 200 can control the transceiver 206 to send information related to the channel occupancy time (COT) to the first device. In addition, the processor 202 of the second device 200 can control the transceiver 206 to send a first physical side link shared channel (PSSCH) to the first device. Then, the processor 202 of the second device 200 can determine a first PSFCH resource for receiving a first physical side link feedback channel (PSFCH) related to the first PSSCH. For example, a second type of channel access for the transmission of the first PSFCH within the COT can be performed by the first device, and the first device can be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0338] Based on the embodiments of the present disclosure, a second device suitable for performing wireless communication may be provided. For example, the second device may include: at least one transceiver; at least one processor; and at least one memory connected to at least one processor and storing instructions. For example, the instructions may enable the second device to perform operations including the following items based on being executed by at least one processor: sending information related to channel occupancy time (COT) to the first device; sending a first physical sidelink shared channel (PSSCH) to the first device; and determining a first PSFCH resource for receiving a first physical sidelink feedback channel (PSFCH) related to the first PSSCH. For example, a second type of channel access for the transmission of a first PSFCH within the COT may be performed by the first device, and the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0339] Based on the embodiments of the present disclosure, a processing device suitable for controlling a second device may be provided. For example, the processing device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, the instructions may enable the second device to perform operations including the following items based on being executed by at least one processor: sending information related to a channel occupancy time (COT) to a first device; sending a first physical sidelink shared channel (PSSCH) to the first device; and determining a first PSFCH resource for receiving a first physical sidelink feedback channel (PSFCH) related to the first PSSCH. For example, a second type of channel access for the transmission of a first PSFCH within the COT may be performed by the first device, and the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0340] Based on the embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, when the instructions are executed, the second device may perform operations including: sending information related to the channel occupancy time (COT) to the first device; sending a first physical sidelink shared channel (PSSCH) to the first device; and determining a first PSFCH resource for receiving a first physical sidelink feedback channel (PSFCH) related to the first PSSCH. For example, a second type of channel access for the transmission of the first PSFCH within the COT may be performed by the first device, and the first device may be allowed to use the COT for a second PSFCH transmission related to a second PSSCH received from a third device.

[0341] Based on various embodiments of the present disclosure, if a COT responding UE that has received shared COT information from a COT initiating UE sends at least one PSFCH to the COT initiating UE based on type 2 LBT within the shared COT duration, other UEs (except the COT initiating UE) may also be allowed to use the shared COT duration for PSFCH transmission based on type 2 LBT. Here, the PSFCH transmission time (of the COT responding UE) to the COT initiating UE and other UEs may be different in the time domain. In this case, the COT responding UE may perform a channel access procedure based on channel access type 2, not only for PSFCH transmission to the COT initiating UE, but also for PSFCH transmission to UEs other than the COT initiating UE. Therefore, the probability of discarding PSFCH transmission due to LBT can be reduced, and service-related requirements within the system can be effectively met.

[0342] Various embodiments of the present disclosure may be combined with each other.

[0343] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0344] The various descriptions, functions, processes, proposals, methods and / or operational flows of the present disclosure described herein may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0345] Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise described, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0346] Fig.17 A communication system 1 according to an embodiment of the present disclosure is shown. Fig.17 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0347] Reference Fig.17, a communication system 1 to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot 100a, a vehicle (100b-1, 100b-2), an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of head mounted devices (HMDs), head up displays (HUDs) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0348] Here, in addition to LTE, NR and 6G, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may also include a narrowband Internet of Things for low-power communication. In this case, for example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology, and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above names. Alternatively or additionally, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on the LTE-M technology. In this case, as an example, the LTE-M technology may be an example of an LPWAN, and may be referred to as various names including enhanced machine type communication (eMTC), etc. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, and is not limited to the above names. Alternatively or additionally, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, a low power wide area network (LPWAN), and ZigBee considering low power communication, and is not limited to the above names. As an example, the ZigBee technology may generate a personal area network (PAN) related to small / low power digital communication based on various standards including IEEE 802.15.4, etc., and may be referred to as various names.

[0349] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0350] Wireless communication / connection 150a, 150b or 150c can be established between wireless devices 100a to 100f / BS200 or BS200 / BS 200. Here, the wireless communication / connection can be established through various RATs (e.g., 5GNR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b can send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation and resource mapping / demapping) and at least a portion of the resource allocation process can be performed based on various proposals of the present disclosure.

[0351] Fig.18 A wireless device according to an embodiment of the present disclosure is shown. Fig.18 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0352] Reference Fig.18 , the first wireless device 100 and the second wireless device 200 may transmit radio signals through various RATs (e.g., LTE and NR). Herein, {the first wireless device 100 and the second wireless device 200} may correspond to Fig.17 {wireless device 100x and BS200} and / or {wireless device 100x and wireless device 100x} in.

[0353] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may also additionally include one or more transceivers 106 and / or one or more antennas 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive a radio signal including a second information / signal through the transceiver 106, and then store the information obtained by processing the second information / signals in the (one or more) memories 104. The (one or more) memories 104 may be connected to the (one or more) processors 102, and may store various information related to the operation of the (one or more) processors 102. For example, (one or more) memory 104 may store software code including commands for executing part or all of the processing controlled by (one or more) processor 102 or for executing the description, function, process, proposal, method and / or operation flow disclosed in this document. Here, (one or more) processor 102 and (one or more) memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceiver 106 may be connected to (one or more) processor 102 and send and / or receive radio signals through (one or more) antenna 108. Each transceiver 106 may include a transmitter and / or a receiver. (One or more) transceiver 106 may be used interchangeably with (one or more) radio frequency (RF) units. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0354] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may also additionally include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then send a radio signal including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive a radio signal including a fourth information / signal through the (one or more) transceivers 106, and then store the information obtained by processing the fourth information / signals in the (one or more) memories 204. (One or more) memory 204 can be connected to (one or more) processors 202, and can store various information related to the operation of (one or more) processors 202. For example, (one or more) memory 204 can store software code including commands for executing part or all of the processing controlled by (one or more) processors 202 or for executing the description, function, process, proposal, method and / or operation flow disclosed in this document. Here, (one or more) processors 202 and (one or more) memory 204 can be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). (One or more) transceivers 206 can be connected to (one or more) processors 202, and send and / or receive radio signals through (one or more) antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. (One or more) transceivers 206 can be used interchangeably with (one or more) RF units. In the present disclosure, a wireless device can represent a communication modem / circuit / chip.

[0355] Below, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document, and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206, and obtain the PDU, SDU, message, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document.

[0356] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs) or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes or functions. Firmware or software configured to perform the descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, thereby being driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document may be implemented using software or firmware in the form of codes, commands and / or command sets.

[0357] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, register, cash memory, computer-readable storage medium, and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0358] One or more transceivers 106 and 206 may send user data, control information and / or radio signals / channels mentioned in the method and / or operation flow of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information and / or radio signals / channels mentioned in the description, function, process, proposal, method and / or operation flow disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202, and may send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information, and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods, and / or operation flows disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0359] Fig.19 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown. Fig.19 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0360] Reference Fig.19 The signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Fig.19 Operation / function, not limited to Fig.18The processor (102, 202) and / or transceiver (106, 206) of Fig.18 The processor (102, 202) and / or the transceiver (106, 206) are implemented Fig.19 For example, you can Fig.18 The processor (102, 202) implements blocks 1010 to 1060. Alternatively, Fig.18 The processor (102, 202) implements blocks 1010 to 1050 and can be implemented by Fig.18 The transceiver (106, 206) is used to implement box 1060.

[0361] Can be through Fig.19 The signal processing circuit 1000 converts the codeword into a radio signal. Herein, the codeword is a coded bit sequence of an information block. The information block may include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0362] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK) and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbol of each transmission layer can be mapped (precoded) to (one or more) corresponding antenna ports by the precoder 1040. The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 with the N*M precoding matrix W. Here, N is the number of antenna ports and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) for the complex modulation symbol. Additionally, the precoder 1040 may perform precoding without performing transform precoding.

[0363] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include multiple symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and multiple subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be sent to other devices through each antenna. To this end, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0364] Can Fig.19 The signal processing process for the signal received in the wireless device is configured in a manner opposite to the signal processing process (1010-1060) of the wireless device. Fig.18 100, 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal can be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword can be restored to the original information block by decoding. Therefore, a signal processing circuit (not illustrated) for receiving a signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0365] Fig. 20 Another example of a wireless device according to an embodiment of the present disclosure is shown. The wireless device can be implemented in various forms according to use cases / services (see Fig.17 ). Fig. 20 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0366] Reference Fig. 20 , the wireless device (100, 200) may correspond to Fig.18 The wireless device (100, 200) may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit 110, a control unit 120, a storage unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and (one or more) transceivers 114. For example, the communication circuit 112 may include Fig.18 One or more processors (102, 202) and / or one or more memories (104, 204) of the present invention. For example, the transceiver(s) 114 may include Fig.18The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the storage unit 130. The control unit 120 can send the information stored in the storage unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store the information received from the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface in the storage unit 130.

[0367] The additional component 140 may be configured in various ways depending on the type of the wireless device. For example, the additional component 140 may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be implemented in the following forms without limitation: a robot ( Fig.17 100a), vehicles ( Fig.17 100b-1 and 100b-2), XR devices ( Fig.17 100c), handheld device ( Fig.17 100d), household appliances ( Fig.17 100e), IoT devices ( Fig.17 100f), digital broadcasting terminals, hologram equipment, public safety equipment, MTC equipment, medical equipment, fintech equipment (or financial equipment), security equipment, climate / environmental equipment, AI servers / equipment ( Fig.17 400), BS( Fig.17 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0368] exist Fig. 20In the wireless device (100, 200), all the various elements, components, units / parts and / or modules in the wireless device (100, 200) can be connected to each other through a wired interface, or at least part of them can be connected wirelessly through the communication unit 110. For example, in each of the wireless devices (100, 200), the control unit 120 and the communication unit 110 can be connected by wire, and the control unit 120 and the first unit (e.g., 130, 140) can be connected wirelessly through the communication unit 110. Each element, component, unit / part and / or module within the wireless device (100, 200) can also include one or more elements. For example, the control unit 120 can be constructed by a set of one or more processors. As an example, the control unit 120 can be constructed by a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory 130 can be constructed by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0369] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig. 20 .

[0370] Fig.21 A handheld device based on an embodiment of the present disclosure is shown. The handheld device may include a smart phone, a smart board, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT). Fig.21 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0371] Reference Fig.21 , the handheld device 100 may include an antenna unit (108), a communication unit 110, a control unit 120, a storage unit 130, a power supply unit 140a, an interface unit 140b and an I / O unit 140c. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to Fig. 20 Frame 110 to 130 / 140.

[0372] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the handheld device 100. The control unit 120 may include an application processor (AP). The storage unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. The storage unit 130 may store input / output data / information. The power supply unit 140a may supply power to the handheld device 100 and include a wired / wireless charging circuit, a battery, etc. The interface unit 140b may support the connection of the handheld device 100 to other external devices. The interface unit 140b may include various ports (e.g., audio I / O ports and video I / O ports) for connecting to external devices. The I / O unit 140c may input or output video information / signals, audio information / signals, data and / or information input by a user. The I / O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker and / or a tactile module.

[0373] For example, in the case of data communication, the I / O unit 140c can obtain information / signals (e.g., touch, text, voice, image, or video) input by the user, and the obtained information / signals can be stored in the storage unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals, and directly send the converted radio signals to other wireless devices or to the BS. The communication unit 110 can receive radio signals from other wireless devices or BSs, and then restore the received radio signals to the original information / signals. The restored information / signals can be stored in the storage unit 130, and can be output as various types (e.g., text, voice, image, video, or tactile) through the I / O unit 140.

[0374] Fig. 22 A vehicle or autonomous vehicle based on an embodiment of the present disclosure is shown. The vehicle or autonomous vehicle can be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc. Fig. 22 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0375] Reference Fig. 22 , the vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Fig. 20 Frame 110 / 130 / 140.

[0376] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may cause the vehicle or autonomous vehicle 100 to travel on the road. The drive unit 140a may include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100 and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire vehicle status, external environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement technology for maintaining the lane in which the vehicle is traveling, technology for automatically adjusting the speed (e.g., adaptive cruise control), technology for autonomously driving along a determined path, technology for driving by automatically setting a path when a destination is set, and the like.

[0377] For example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 can control the drive unit 140a so that the vehicle or the autonomous vehicle 100 can move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 can aperiodically / periodically obtain the latest traffic information data from the external server and obtain the surrounding traffic information data from the adjacent vehicle. In the middle of autonomous driving, the sensor unit 140c can obtain vehicle status and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving path and driving plan based on the newly acquired data / information. The communication unit 110 can transmit information about the vehicle position, autonomous driving path and / or driving plan to the external server. The external server can predict traffic information data based on the information collected from the vehicle or autonomous vehicle using AI technology, etc., and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0378] The claims in this specification can be combined in various ways. For example, the technical features in the method claims of this specification can be combined to be implemented or performed in a device, and the technical features in the device claims can be combined to be implemented or performed in a method. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a device. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a method.

Claims

1. A method for performing wireless communication by a first device, the method comprising: receiving information related to the channel occupancy time COT from the second device; receiving a first physical sidelink shared channel PSSCH from the second device; Determine a first PSFCH resource for sending a first physical sidelink feedback channel PSFCH associated with the first PSSCH; as well as performing a second type of channel access for the first PSFCH transmission within the COT, The first device is allowed to use the COT for a second PSFCH transmission associated with a second PSSCH received from a third device.

2. The method according to claim 1, wherein: The second type of channel access includes at least one of channel access during a 25 microsecond sensing interval, channel access during a 16 microsecond sensing interval, or channel access without sensing.

3. The method according to claim 1, wherein: The first type of channel access based on random backoff is performed outside the COT.

4. The method according to claim 1, wherein: The second type channel access is performed during a time interval preceding the first PSFCH resource for the first PSFCH transmission and a time interval preceding a second PSFCH resource for the second PSFCH transmission.

5. The method according to claim 1, wherein: A time domain of the first PSFCH resource used for the first PSFCH transmission and a time domain of the second PSFCH resource used for the second PSFCH transmission are within the COT.

6. The method according to claim 1, wherein: The first PSFCH resource used for the first PSFCH transmission and the second PSFCH resource used for the second PSFCH transmission are in different PSFCH opportunities.

7. The method according to claim 1, wherein: The second PSFCH resources used for the second PSFCH transmission follow the first PSFCH resources used for the first PSFCH transmission in the time domain.

8. The method according to claim 1, wherein: The first PSSCH is received from the second device within the COT.

9. The method according to claim 1, wherein: Based on the first PSFCH transmission being for the second device among a plurality of PSFCH transmissions within a resource block (RB) set associated with the COT shared from the second device, the second type channel access is allowed for the plurality of PSFCH transmissions.

10. The method according to claim 1, wherein: The type of the second type of channel access is selected based on the shortest time gap between multiple PSFCH transmissions and multiple PSSCH receptions within an RB set.

11. The method according to claim 1, wherein: The type of the second type of channel access is selected based on a longest time gap between multiple PSFCH transmissions and multiple PSSCH receptions within an RB set.

12. The method according to claim 1, further comprising: A transmit power is determined for a plurality of PSFCH transmissions including the first PSFCH transmission.

13. The method according to claim 12, wherein: Based on skipping at least one PSFCH transmission among the multiple PSFCH transmissions due to listen-before-talk (LBT) failure, the transmission power of one or more PSFCH transmissions used to exclude the at least one PSFCH transmission from the multiple PSFCH transmissions is determined based on the number of the multiple PSFCH transmissions.

14. A first device adapted to perform wireless communication, the first device comprising: at least one transceiver; at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations including the following upon being executed by the at least one processor: receiving information related to the channel occupancy time COT from the second device; receiving a first physical sidelink shared channel PSSCH from the second device; Determine a first PSFCH resource for sending a first physical sidelink feedback channel PSFCH associated with the first PSSCH; as well as performing a second type of channel access for the first PSFCH transmission within the COT, The first device is allowed to use the COT for a second PSFCH transmission associated with a second PSSCH received from a third device.

15. A processing device adapted to control a first device, the processing device comprising: at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations including the following upon being executed by the at least one processor: receiving information related to the channel occupancy time COT from the second device; receiving a first physical sidelink shared channel PSSCH from the second device; Determine a first PSFCH resource for sending a first physical sidelink feedback channel PSFCH associated with the first PSSCH; as well as performing a second type of channel access for the first PSFCH transmission within the COT, The first device is allowed to use the COT for a second PSFCH transmission associated with a second PSSCH received from a third device.

16. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a first device to perform operations comprising: receiving information related to the channel occupancy time COT from the second device; receiving a first physical sidelink shared channel PSSCH from the second device; Determine a first PSFCH resource for sending a first physical sidelink feedback channel PSFCH associated with the first PSSCH; as well as performing a second type of channel access for the first PSFCH transmission within the COT, The first device is allowed to use the COT for a second PSFCH transmission associated with a second PSSCH received from a third device.

17. A method for performing wireless communication by a second device, the method comprising: Sending information related to the channel occupancy time COT to the first device; Sending a first physical side link shared channel PSSCH to the first device; as well as determining a first PSFCH resource for reception of a first physical sidelink feedback channel PSFCH associated with the first PSSCH, wherein the second type of channel access for the transmission of the first PSFCH within the COT is performed by the first device, and The first device is allowed to use the COT for a second PSFCH transmission associated with a second PSSCH received from a third device.

18. A second device adapted to perform wireless communication, the second device comprising: at least one transceiver; at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions causing the second device to perform operations including the following upon being executed by the at least one processor: Sending information related to the channel occupancy time COT to the first device; Sending a first physical sidelink shared channel PSSCH to the first device; and determining a first PSFCH resource for reception of a first physical sidelink feedback channel PSFCH associated with the first PSSCH, wherein the second type of channel access for the transmission of the first PSFCH within the COT is performed by the first device, and The first device is allowed to use the COT for a second PSFCH transmission associated with a second PSSCH received from a third device.

19. A processing device adapted to control a second device, the processing device comprising: at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions causing the second device to perform operations including the following upon being executed by the at least one processor: Sending information related to the channel occupancy time COT to the first device; Sending a first physical sidelink shared channel PSSCH to the first device; and determining a first PSFCH resource for reception of a first physical sidelink feedback channel PSFCH associated with the first PSSCH, wherein the second type of channel access for the transmission of the first PSFCH within the COT is performed by the first device, and The first device is allowed to use the COT for a second PSFCH transmission associated with a second PSSCH received from a third device.

20. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a second device to perform operations comprising: Sending information related to the channel occupancy time COT to the first device; Sending a first physical sidelink shared channel PSSCH to the first device; and determining a first PSFCH resource for reception of a first physical sidelink feedback channel PSFCH associated with the first PSSCH, in, A second type of channel access for transmission of the first PSFCH within the COT is performed by the first device, and The first device is allowed to use the COT for a second PSFCH transmission associated with a second PSSCH received from a third device.

Images