Method and apparatus for performing sidelink communication in unlicensed band

Abstract

A method performed by a first device in a wireless communication system and a device supporting the same are provided. The method may comprise the steps of: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; obtaining side link (SL) discontinuous reception (DRX) configuration information, the configuration information including information related to an SL DRX hybrid automatic repeat and request (HARQ) round trip time (RTT) timer; receiving a first sidelink control information (SCI) for scheduling a second sidelink control information (SCI) and a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH); and receiving the second SCI and the data through the PSSCH. For example, the PSSCH may be associated with a plurality of PSFCH occasions. For example, based on transmitting an SL HARQ feedback failure in a plurality of PSFCH occasions, an SL DRX HARQ RTT timer may be started after a last PSFCH occasion among the plurality of PSFCH occasions.

Description

Technical Field

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

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

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

[0004] Technical Solution

[0005] According to an embodiment, a method performed by a first device may be provided. The method may include: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; receiving, on a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) for scheduling a second SCI and a physical sidelink shared channel (PSSCH); and receiving, on the PSSCH, the second SCI and data. For example, the PSSCH may be related to a plurality of PSFCH occasions. For example, based on the inability to send SL HARQ feedback in a plurality of PSFCH occasions, the SL DRX HARQ RTT timer is started after a last PSFCH occasion among the plurality of PSFCH occasions.

[0006] According to an embodiment, a first device configured to perform wireless communication may be 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, and the instructions, when executed by the at least one processor, cause the first device to perform operations including: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; obtaining sidelink (SL) discontinuous reception (DRX) configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; receiving, on a physical sidelink control channel (PSCCH), a first SCI for scheduling a second sidelink control information (SCI) and a physical sidelink shared channel (PSSCH); and receiving, on the PSSCH, the second SCI and data. For example, the PSSCH may be related to a plurality of PSFCH occasions. For example, based on the inability to send SL HARQ feedback in a plurality of PSFCH occasions, an SL DRX HARQ RTT timer is started after the last PSFCH occasion among the plurality of PSFCH occasions.

[0007] According to an embodiment, a processing device configured to control a first device may be 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, and the instructions, when executed by the at least one processor, cause the first device to perform operations including: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; obtaining sidelink (SL) discontinuous reception (DRX) configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; receiving, on a physical sidelink control channel (PSCCH), a first SCI for scheduling a second sidelink control information (SCI) and a physical sidelink shared channel (PSSCH); and receiving, on the PSSCH, the second SCI and data. For example, the PSSCH may be related to a plurality of PSFCH occasions. For example, based on the inability to send SL HARQ feedback in a plurality of PSFCH occasions, an SL DRX HARQ RTT timer is started after the last PSFCH occasion among the plurality of PSFCH occasions.

[0008] According to an embodiment, a non - transitory computer - readable storage medium storing instructions can be provided. The instructions, when executed, cause a first device to perform operations, the operations including: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round - trip time (RTT) timer; receiving, on a physical sidelink control channel (PSCCH), a first SCI for scheduling a second sidelink control information (SCI) and a physical sidelink shared channel (PSSCH); and receiving, on the PSSCH, the second SCI and data. For example, the PSSCH can be related to a plurality of PSFCH occasions. For example, based on the inability to send SL HARQ feedback in a plurality of PSFCH occasions, the SL DRX HARQ RTT timer is started after the last PSFCH occasion among the plurality of PSFCH occasions. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

[0015] Figure 7 Illustrates an example of a bandwidth part (BWP) based on an embodiment of the present disclosure.

[0016] Figure 8 Illustrates a process in which a user equipment (UE) performs vehicle - to - everything (V2X) or sidelink (SL) communication based on a transmission mode according to an embodiment of the present disclosure.

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

[0018] Figure 10 Illustrates interleaved resource blocks (RBs) based on an embodiment of the present disclosure.

[0019] Figure 11 Shows an example of a wireless communication system supporting unlicensed bands according to an embodiment of the present disclosure.

[0020] Figure 12 Shows a method of occupying resources in an unlicensed band according to an embodiment of the present disclosure.

[0021] Figure 13 Shows a case where multiple LBT-SBs are included in an unlicensed band according to an embodiment of the present disclosure.

[0022] Figure 14 Shows the CAP operation performed by a base station to transmit a downlink signal through an unlicensed band according to an embodiment of the present disclosure.

[0023] Figure 15 Shows a type 1 CAP operation performed by a UE to transmit an uplink signal according to an embodiment of the present disclosure.

[0024] Figure 16 Shows a channel access procedure according to an embodiment of the present disclosure.

[0025] Figure 17 Shows an embodiment of multiple PSFCH opportunities for each PSCCH / PSSCH according to an embodiment of the present disclosure.

[0026] Figure 18 Shows a method of performing wireless communication by a first device according to an embodiment of the present disclosure.

[0027] Figure 19 Shows a method of performing wireless communication by a second device according to an embodiment of the present disclosure.

[0028] Figure 20 Shows communication system 1 according to an embodiment of the present disclosure.

[0029] Figure 21 Shows a wireless device according to an embodiment of the present disclosure.

[0030] Figure 22 Shows a signal processing circuit for transmitting a signal according to an embodiment of the present disclosure.

[0031] Figure 23 Shows another example of a wireless device according to an embodiment of the present disclosure.

[0032] Figure 24 Shows a handheld device according to an embodiment of the present disclosure.

[0033] Figure 25 Shows a vehicle or autonomous vehicle according to an embodiment of the present disclosure. Detailed implementation manners

[0034] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, in the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in the present disclosure, "A, B, or C" may mean "only A", "only B", "only C", or "any combination of A, B, and C".

[0035] The slashes ( / ) or commas used in the present disclosure may mean "and / or". For example, "A / B" may mean "A and / or B". Therefore, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0036] In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". Additionally, in the present disclosure, the expressions "at least one of A or B" or "at least one of A and / or B" may be interpreted as "at least one of A and B".

[0037] Furthermore, in the present disclosure, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". Additionally, "at least one of A, B, or C" or "at least one of A, B, and / or C" may mean "at least one of A, B, and C".

[0038] Moreover, the parentheses used in the present disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean presenting "PDCCH" as an example of "control information". In other words, the "control information" in the present disclosure is not limited to "PDCCH", and "PDDCH" may be presented as an example of "control information". Specifically, when indicated as "control information (i.e., PDCCH)", this may also mean presenting "PDCCH" as an example of "control information".

[0039] In the following description, "when, if, or in the case of" may be replaced by "based on".

[0040] The technical features separately described in one drawing in the present disclosure may be implemented separately or may be implemented simultaneously.

[0041] In the present disclosure, higher layer parameters may be parameters configured, pre-configured, or pre-defined for a UE. For example, a base station or network may send higher layer parameters to the UE. For example, higher layer parameters may be sent via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0042] The techniques described below can be used in various wireless communication systems such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-Carrier Frequency Division Multiple Access (SC-FDMA), etc. CDMA can be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA can be implemented using radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. IEEE 802.16m is an evolved version of IEEE 802.16e and provides backward compatibility for IEEE 802.16e-based systems. UTRA is part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) is part of the Evolved UMTS (E-UMTS) that uses E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (LTE-A) is an evolution of LTE.

[0043] 5G NR is a follow-up technology to LTE-A corresponding to a new and innovative mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can use resources of all available spectrums including low frequency bands below 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequencies (millimeter waves) above 24 GHz.

[0044] The 6G (wireless communication) system aims to have characteristics such as (i) very high data rate per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced energy consumption of battery-less IoT devices, (vi) ultra-reliable connectivity, and (vii) networked intelligence with machine learning capabilities. The vision of the 6G system can include four aspects such as intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and the 6G system can meet the requirements shown in Table 1 below. That is, Table 1 shows the requirements of the 6G system.

[0045] [Table 1]

[0046] Peak data rate per device 1 Tbps E2E latency 1 ms Maximum spectral efficiency 100 bps / Hz Mobility support Up to 1000 km / h Satellite integration Fully AI Fully Autonomous vehicles Fully XR Fully Tactile communication Fully

[0047] The 6G system can have key factors such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), massive machine-type communication (mMTC), AI-integrated communication, tactile Internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0048] Figure 1 Illustrates the communication structure that can be provided in a 6G system based on an embodiment of the present disclosure. Figure 1 Embodiments of can be combined with various embodiments of the present disclosure.

[0049] The 6G system will have 50 times higher simultaneous wireless communication connectivity than the 5G wireless communication system. URLLC, which is a major function of 5G, will become an even more important technology by providing an end-to-end latency of less than 1 ms in 6G communication. Different from the frequently used domain spectral efficiency, the 6G system can have better volumetric spectral efficiency. The 6G system can provide advanced battery technology for energy harvesting and very long battery life, and thus mobile devices in the 6G system may not need to be charged separately. In 6G, new network characteristics can be as follows.

[0050] - Satellite-integrated network: To provide global mobile groups, 6G will be integrated with satellites. Integrating terrestrial waves, satellites, and public networks into one wireless communication system may be very important for 6G.

[0051] - Interconnected intelligence: Different from the previous generations of wireless communication systems, 6G is innovative, and the wireless evolution may be updated from "connected things" to "connected intelligence". AI can be applied in each step of the communication process (or each signal processing process described below).

[0052] - Seamless integration of wireless information and energy transfer: The 6G wireless network can transfer electricity to charge the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transfer (WIET) will be integrated.

[0053] - Ubiquitous ultra-three-dimensional connectivity: Access to the network and core network functions of drones and very low Earth orbit satellites will establish ultra-3D connections in 6G ubiquity.

[0054] Among the new network characteristics of 6G, several general requirements are as follows.

[0055] - Small cell network: The concept of a small cell network is introduced to improve the received signal quality as a result of the improvement of the throughput, energy efficiency, and spectral efficiency of the cellular system. Therefore, the small cell network is a necessary feature of 5G and beyond 5G (5GB) communication systems. Therefore, the 6G communication system also adopts the characteristics of the small cell network.

[0056] - Ultra-dense heterogeneous network: Ultra-dense heterogeneous network will be another important feature of 6G communication systems. A multi-tier network composed of heterogeneous networks improves the overall QoS and reduces costs.

[0057] - High-capacity backhaul: Backhaul connections are characterized by high-capacity backhaul networks to facilitate high-capacity services. High-speed optical fibers and free space optical (FSO) systems can be possible solutions to this problem.

[0058] - 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.

[0059] - Softwareization and virtualization: Softwareization and virtualization are two important functions, which are the basis of the design process in 5G networks to ensure flexibility, reconfigurability, and programmability.

[0060] The core implementation technologies of 6G systems are described below.

[0061] - Artificial intelligence (AI): The most important and newly introduced technology in 6G systems is AI. AI was not involved in 4G systems. 5G systems will support partial or very limited AI. However, 6G systems will support AI for full automation. Advancements in machine learning will create a more intelligent network for real-time communication in 6G. When AI is introduced into communication, real-time data transmission can be simplified and improved. AI can use numerous analyses to determine ways to perform complex target tasks. That is, AI can increase efficiency and reduce processing latency. Time-consuming operations such as handover, network selection, and resource scheduling can be immediately executed by AI. AI can also play an important role in M2M, machine-to-human, and human-to-machine. Additionally, AI may be instant communication in brain-computer interfaces (BCIs). AI-based communication systems can be supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent cognitive radios, self-maintaining wireless networks, and machine learning.

[0062] - Terahertz (THz) Communication: The data rate can be increased by increasing the bandwidth. This can be achieved by using sub-TH communication with broad bandwidth and applying advanced massive MIMO technology. THz waves are called sub-millimeter radiation and generally indicate a frequency band between 0.1 THz and 10 THz with corresponding wavelengths in the range of 0.03 mm to 3 mm. The band range of 100 GHz to 300 GHz (sub-THz band) is regarded as the main part of the THz band for cellular communication. When the sub-THz band is added to the millimeter wave band, the capacity of 6G cellular communication increases. The defined THz band of 300 GHz to 3 THz is in the far-infrared (IR) band. The band of 300 GHz to 3 THz is part of the optical band but lies at the boundary of the optical band and immediately follows the RF band. Therefore, the band of 300 GHz to 3 THz has similarities with RF. Figure 2 Shows the electromagnetic spectrum based on an embodiment of the present disclosure. Figure 2 Embodiments of can be combined with various embodiments of the present disclosure. The main features of THz communication include (i) a bandwidth that can be widely used to support very high data rates; and (ii) high path loss occurring at high frequencies (highly directional antennas are essential). The narrow beam width generated in highly directional antennas reduces interference. The small wavelength of THz signals allows a larger number of antenna elements to be integrated with devices and BS operating in this frequency band. Therefore, advanced adaptive arrangement techniques that can overcome range limitations can be used.

[0063] - Massive MIMO Technology (Large MIMO)

[0064] - Holographic Beamforming (HBF)

[0065] - Optical Wireless Technology

[0066] - Free Space Optical Backhaul Network (FSO Backhaul Network)

[0067] - Non-Terrestrial Network (NTN)

[0068] - Quantum Communication

[0069] - Cell-Free Communication

[0070] - Integration of Wireless Information and Power Transmission

[0071] - Integration of Wireless Communication and Sensing

[0072] - Integrated Access and Backhaul Network

[0073] - Big Data Analysis

[0074] - Reconfigurable Intelligent Surface

[0075] - Metaverse

[0076] - Blockchain

[0077] - Unmanned Aerial Vehicle (UAV): Unmanned Aerial Vehicle (UAV) or drone will become an important factor in 6G wireless communication. In most cases, UAV technology is used to provide high-speed wireless data connection. A base station entity is installed inside the UAV to provide cellular connectivity. UAVs have certain functions not found in fixed base station infrastructure, such as easy deployment, strong line-of-sight links, and freedom of mobility control. During emergency events such as natural disasters, it is economically unfeasible to deploy ground telecommunications infrastructure and sometimes it is unable to provide services in a turbulent environment. UAVs can easily handle such situations. UAVs will become a new paradigm in the field of wireless communication. This technology promotes the three basic requirements of wireless networks, such as eMBB, URLLC, and mMTC. UAVs can also be used for various purposes, such as network connectivity improvement, fire detection, disaster emergency services, security and monitoring, pollution monitoring, parking monitoring, and accident monitoring. Therefore, UAV technology is recognized as one of the most important technologies for 6G communication.

[0078] - Autonomous driving: To achieve perfect autonomous driving, it is necessary to mutually notify dangerous situations through vehicle-to-vehicle communication and check information such as parking information location and signal change time through communication between the vehicle and infrastructure such as parking lots and / or traffic lights. Vehicle-to-Everything (V2X) is the core element for building the autonomous driving infrastructure and is a technology for vehicles to communicate and share with various elements in the road, such as Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I). To maximize the performance of autonomous driving and ensure high safety, high transmission speed and low latency technologies are required. In addition, to directly control a vehicle in a dangerous situation and actively intervene in vehicle driving at a level beyond warning or guidance messages to the driver, since the amount of information to be sent and received is large, autonomous driving is expected to be maximized in 6G with a faster transmission speed and lower latency than 5G.

[0079] For the clarity of the specification, 5G NR is mainly described, but the technical idea according to the embodiments of the present disclosure is not limited thereto. Various embodiments of the present disclosure can also be applied to 6G communication systems.

[0080] Figure 3 Shows the structure of an NR system based on an embodiment of the present disclosure. Figure 3 Embodiments can be combined with various embodiments of the present disclosure.

[0081] Refer to Figure 3, the next-generation radio access network (NG-RAN) may include a BS20 that provides user plane and control plane protocol termination to the UE 10. For example, the BS20 may include a next-generation Node B (gNB) and / or an evolved Node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to by other terms such as mobile station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), wireless device, etc. For example, the BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to by other terms such as base transceiver system (BTS), access point (AP), etc.

[0082] Figure 3 An embodiment illustrates the case where only gNBs are included. The BS20s may be interconnected via the Xn interface. The BS20s may be interconnected via the fifth-generation (5G) core network (5GC) and the NG interface. More specifically, the BS20 may be connected to the access and mobility management function (AMF) 30 via the NG-C interface and may be connected to the user plane function (UPF) 30 via the NG-U interface.

[0083] The radio interface protocol layers between the UE and the network may be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the well-known Open Systems Interconnection (OSI) model in a communication system. Among them, the physical (PHY) layer belonging to the first layer provides information transmission services using physical channels, and the radio resource control (RRC) layer located in the third layer controls the radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0084] Figure 4 Shows a radio protocol architecture based on an embodiment of the present disclosure. Figure 4 The embodiments of may be combined with various embodiments of the present disclosure. Specifically, Figure 4 In (a) of shows a radio protocol stack for the user plane for Uu communication, and Figure 4 In (b) of shows a radio protocol stack for the control plane for Uu communication. Figure 4 In (c) of shows a radio protocol stack for the user plane for SL communication, and Figure 4 In (d) of shows a radio protocol stack for the control plane for SL communication.

[0085] Refer to Figure 4, The physical layer provides an information transfer service to the upper layer through physical channels. The physical layer is connected to the Medium Access Control (MAC) layer, which is the upper layer of the physical layer, through transport channels. Data is transferred between the MAC layer and the physical layer through transport channels. Transport channels are classified according to how data is transmitted through the radio interface and what characteristics of the data are transmitted.

[0086] Data is transferred through physical channels between different physical layers (i.e., the PHY layer of the transmitter and the PHY layer of the receiver). The physical channels can be modulated using the Orthogonal Frequency Division Multiplexing (OFDM) scheme, and the physical channels use time and frequency as radio resources.

[0087] The MAC layer provides services to the Radio Link Control (RLC) layer via logical channels, and the RLC layer is the upper layer of the MAC layer. The MAC layer provides the function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides the function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides a data transfer service through logical channels.

[0088] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). To ensure different Quality of Service (QoS) required for radio bearers (RB), 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).

[0089] The Radio Resource Control (RRC) layer is only defined in the control plane. The RRC layer is used to control logical channels, transport channels, and physical channels associated with the configuration, reconfiguration, and release of RBs. An RB is a logical path provided by the first layer (i.e., the physical layer or PHY layer) and the second layer (i.e., the MAC layer, RLC layer, Packet Data Convergence Protocol (PDCP) layer, and Service Data Adaptation Protocol (SDAP) layer) for data transfer between the UE and the network.

[0090] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include the transmission of user data, header compression, and encryption. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include the transmission of control plane data and encryption / integrity protection.

[0091] The Service Data Adaptation Protocol (SDAP) layer is only defined in the user plane. The SDAP layer performs the mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and the QoS flow ID (QFI) marking in both DL packets and UL packets.

[0092] The configuration of an RB means a process for specifying radio protocol layer and channel attributes to provide a specific service and for determining corresponding detailed parameters and operation methods. An RB can then be classified into two types, namely, a signaling radio bearer (SRB) and a data radio bearer (DRB). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

[0093] When an 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, an RRC inactive (RRC_INACTIVE) state is additionally defined, and a UE in the RRC_INACTIVE state can maintain its connection with the core network while releasing its connection with the BS.

[0094] Data is sent from the network to the UE via a downlink transport channel. Examples of the downlink transport channel include a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting other user services or control messages. The services or control messages of a downlink multicast or broadcast service can be sent via the downlink SCH or can be sent via a separate downlink multicast channel (MCH). In addition, the uplink transport channels for sending (or transmitting) data from the UE to the network include a random access channel (RACH) for sending an initial control message and an uplink shared channel (SCH) for sending other user services or control messages.

[0095] Examples of logical channels that belong to a higher layer of a transport channel and are mapped to the transport channel can 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.

[0096] Figure 5 Shows the structure of a radio frame of NR according to an embodiment of the present disclosure. Figure 5 Embodiments can be combined with various embodiments of the present disclosure.

[0097] Refer to Figure 5, in NR, radio frames can be used to perform uplink and downlink transmissions. The length of a radio frame is 10 ms and it can be defined as consisting of two half-frames (HFs). A half-frame can include five 1-ms sub-frames (SFs). A sub-frame (SF) can be divided into one or more time slots, and the number of time slots within a sub-frame can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM(A) symbols according to the cyclic prefix (CP).

[0098] In the case of using normal CP, each time slot can include 14 symbols. In the case of using extended CP, each time slot can include 12 symbols. In this document, symbols can include OFDM symbols (or CP-OFDM symbols) and single-carrier FDMA (SC-FDMA) symbols (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols).

[0099] Table 2 shown below represents the number of symbols (N slot symb ) per time slot, the number of time slots per frame (N frame,μ slot ) and the number of time slots per sub-frame (N subframe ,μ slot ) based on the SCS configuration (μ) in the case of using normal CP or extended CP.

[0100] [Table 2]

[0101]

[0102] In an NR system, the OFDM(A) parameter sets (e.g., SCS, CP length, etc.) between multiple cells integrated into one UE can be configured differently. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., sub-frame, time slot or TTI) (collectively referred to as time unit (TU) for simplicity) consisting of the same number of symbols can be configured differently in the integrated cells.

[0103] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, in the case where the SCS is 15 kHz, a wide range of traditional cellular bands can be supported, and in the case where the SCS is 30 kHz / 60 kHz, dense urban areas, lower latency, and wider carrier bandwidth can be supported. In the case where the SCS is 60 kHz or higher, in order to overcome phase noise, a bandwidth greater than 24.25 GHz can be used.

[0104] The NR frequency band can be defined as two different types of frequency ranges. The two different types of frequency ranges can be FR1 and FR2. The values of the frequency ranges can change (or vary). For example, the two different types of frequency ranges can be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean "the range below 6 GHz", and FR2 can mean "the range above 6 GHz", and can also be referred to as millimeter wave (mmW).

[0105] [Table 3]

[0106] Frequency range designation Corresponding frequency range Subcarrier spacing (SCS) FR1 450 MHz – 6000 MHz 15, 30, 60 kHz FR2 24250 MHz – 52600 MHz 60, 120, 240 kHz

[0107] As described above, the values of the frequency ranges in the NR system can change (or vary). For example, as shown in Table 4 below, FR1 can include a bandwidth in the range of 410 MHz to 7125 MHz. More specifically, FR1 can include frequency bands at 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the frequency bands at 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 can include unlicensed frequency bands. The unlicensed frequency bands can be used for various purposes. For example, the unlicensed frequency bands are used for vehicle-specific communications (e.g., autonomous driving).

[0108] [Table 4]

[0109] Frequency range designation Corresponding frequency range Subcarrier spacing (SCS) FR1 410 MHz – 7125 MHz 15, 30, 60 kHz FR2 24250 MHz – 52600 MHz 60, 120, 240 kHz

[0110] Figure 6 Shows the structure of a time slot of an NR frame according to an embodiment of the present disclosure. Figure 6 The embodiments of can be combined with various embodiments of the present disclosure.

[0111] Refer to Figure 6 , a time slot includes a plurality of symbols in the time domain. For example, in the case of normal CP, one time slot can include 14 symbols. For example, in the case of extended CP, one time slot can include 12 symbols. Alternatively, in the case of normal CP, one time slot can include 7 symbols. However, in the case of extended CP, one time slot can include 6 symbols.

[0112] A carrier includes a plurality of subcarriers in the frequency domain. A resource block (RB) can be defined as a plurality of consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth part (BWP) can be defined as a plurality of consecutive (physical) resource blocks ((P)RB) in the frequency domain, and the BWP can correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via an active BWP. Each element can be referred to as a resource element (RE) in a resource grid, and one complex symbol can be mapped to each element.

[0113] In the following, the bandwidth part (BWP) and the carrier will be described in detail.

[0114] The BWP can be a continuous set of physical resource blocks (PRB) within a given parameter set. The PRB can be selected from a continuous subset of common resource blocks (CRB) for a given parameter set on a given carrier.

[0115] For example, the BWP can be at least any one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor the downlink radio link quality in a DL BWP other than the active DL BWP on the primary cell (PCell). For example, the UE may not receive a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a channel state information (CSI) report for an inactive DL BWP. For example, the UE may not transmit a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) outside the active UL BWP. For example, in the case of the downlink, the initial BWP can be given as a continuous RB set for the remaining minimum system information (RMSI) control resource set (CORESET) (configured by the physical broadcast channel (PBCH)). For example, in the case of the uplink, the initial BWP can be given by a system information block (SIB) for the random access procedure. For example, the default BWP can be configured by a higher layer. For example, the initial value of the default BWP can be the initial DL BWP. For power saving, if the UE cannot detect downlink control information (DCI) during a specified period, the UE can switch the active BWP of the UE to the default BWP.

[0116] In addition, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting UE can transmit an SL channel or an SL signal on a specific BWP, and a receiving UE can receive an SL channel or an SL signal on a specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have configuration signaling separate from the Uu BWP. For example, a UE can receive configuration for the SL BWP from the BS / network. For example, a UE can receive configuration for the Uu BWP from the BS / network. The SL BWP is (pre-)configured in the carrier for out-of-coverage NR V2X UEs and RRC_IDLE UEs. For a UE in the RRC_CONNECTED mode, at least one SL BWP can be activated in the carrier.

[0117] Figure 7 FIG. shows an example of a BWP according to an embodiment of the present disclosure. Figure 7 Embodiments of can be combined with various embodiments of the present disclosure. Assume that in Figure 7 the embodiment of, the number of BWPs is 3.

[0118] Referring to Figure 7 , a common resource block (CRB) can be a carrier resource block numbered from one end to the other end of a carrier band. Additionally, a PRB can be a resource block numbered within each BWP. Point A can indicate a common reference point of a resource block grid.

[0119] A BWP can be configured by point A, an offset (N start BWP ) relative to point A, and a bandwidth (N size BWP ). For example, point A can be an external reference point of the PRBs of a carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) is aligned at point A. For example, the offset can be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth can be the number of PRBs within a given parameter set.

[0120] Hereinafter, V2X or SL communication will be described.

[0121] The sidelink synchronization signal (SLSS) may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS) as SL-specific sequences. The PSSS may be referred to as the sidelink primary synchronization signal (S-PSS), and the SSSS may be referred to as the sidelink secondary synchronization signal (S-SSS). For example, an M-sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE may use the S-PSS and S-SSS for detailed synchronization acquisition and for the detection of the synchronization signal ID.

[0122] The physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information that the UE must first know before SL signal transmission / reception. For example, the default information may be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to the resource pool, and the type of application related to SLSS, subframe offset, broadcast information, etc. For example, in order to evaluate the PSBCH performance, in NR V2X, the payload size of the PSBCH may be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0123] The S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., the SL synchronization signal (SS) / PSBCH block, hereinafter, the sidelink synchronization signal block (S-SSB)). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in the carrier, and the transmission bandwidth may be within the (pre-)configured sidelink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (SB). For example, the PSBCH may span 11 RBs. Additionally, the frequency position of the S-SSB can be (pre-)configured. Thus, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0124] Figure 8 The process of the UE performing V2X or SL communication based on the transmission mode according to an embodiment of the present disclosure is shown. Figure 8 The embodiments can be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for ease of description, in LTE, the transmission mode may be referred to as the LTE transmission mode. In NR, the transmission mode may be referred to as the NR resource allocation mode.

[0125] For example, Figure 8 in (a) of Figure 8 shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 8 in (a) of Figure 8 shows UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to regular SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0126] For example, Figure 8 in (b) of Figure 8 shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 in (b) of Figure 8 shows UE operations related to NR resource allocation mode 2.

[0127] Referring to Figure 8 in (a) of Figure 8 , in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the base station can schedule SL resources to be used by the UE for SL transmission. For example, in step S800, the base station can send information related to the SL resources and / or information related to the UL resources to the first UE. For example, the UL resources can include PUCCH resources and / or PUSCH resources. For example, the UL resources can be resources for reporting SL HARQ feedback to the base station.

[0128] For example, the first UE can receive information related to dynamic grant (DG) resources and / or information related to configured grant (CG) resources from the base station. For example, the CG resources can include CG type 1 resources or CG type 2 resources. In the present disclosure, the DG resources can be resources configured / assigned to the first UE by the base station through downlink control information (DCI). In the present disclosure, the CG resources can be (periodic) resources configured / assigned to the first UE by the base station through DCI and / or RRC messages. For example, in the case of CG type 1 resources, the base station can send an RRC message including information related to the CG resources to the first UE. For example, in the case of CG type 2 resources, the base station can send an RRC message including information related to the CG resources to the first UE, and the base station can send DCI related to the activation or release of the CG resources to the first UE.

[0129] In step S810, the first UE may send a PSCCH (e.g., a sidelink control indicator (SCI) or a first-level SCI) to the 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 the PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on the HARQ feedback information received from the second UE. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on pre-configured rules. For example, the DCI may be a DCI for SL scheduling. For example, the format of the DCI may be DCI format 3_0 or DCI format 3_1.

[0130] In the following, an example of DCI format 3_0 will be described.

[0131] DCI format 3_0 is used for the scheduling of NR PSCCH and NR PSSCH in a cell.

[0132] The following information is sent via DCI format 3_0 with a CRC scrambled by the SL-RNTI or the SL-CS-RNTI:

[0133] - Resource pool index - ceiling(log2I) bits, where I is the number of resource pools for transmission configured by the higher layer parameter sl-TxPoolScheduling.

[0134] - Time gap - 3 bits determined by the higher layer parameter sl-DCI-ToSL-Trans

[0135] - HARQ process number - 4 bits

[0136] - New data indicator - 1 bit

[0137] - Lowest index of the subchannel assigned for the initial transmission - ceiling(log2(N SL subChannel )) bits

[0138] - SCI format 1-A fields: frequency resource assignment, time resource assignment

[0139] -PSFCH-to-HARQ feedback timing indicator - ceiling(log2N fb_timing ) bits, where N fb_timing is the number of entries in the higher layer parameter sl-PSFCH-ToPUCCH.

[0140] -PUCCH resource indicator - 3 bits

[0141] -Configuration index - 0 bits if the UE is not configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI; otherwise 3 bits. If the UE is configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI, this field is reserved for DCI format 3_0 with CRC scrambled by SL-RNTI.

[0142] -Counter side link assignment index - 2 bits if the UE is configured with pdsch-HARQ-ACK-Codebook = dynamic; 2 bits if the UE is configured with pdsch-HARQ-ACK-Codebook = semi-static

[0143] -Padding bits if required

[0144] Refer to Figure 8 In (b) below, 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 pre-configured SL resources. For example, the configured SL resources or pre-configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule the resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting the 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 sub-channels. For example, in step S810, the first UE that has itself selected resources from the resource pool can send a PSCCH (e.g., side link control indicator (SCI) or first-level SCI) to the second UE using the resources. In step S820, the first UE can send a PSSCH (e.g., second-level SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S830, the first UE can receive a PSFCH related to the PSCCH / PSSCH from the second UE.

[0145] Refer to Figure 8For (a) or (b) above, for example, the first UE may send the SCI to the second UE via the PSCCH. Alternatively, for example, the first UE may send two consecutive SCIs (e.g., level 2 SCI) to the second UE via the PSCCH and / or PSSCH. In this case, the second UE may decode the two consecutive SCIs (e.g., level 2 SCI) to receive the PSSCH from the first UE. In the present disclosure, the SCI sent via the PSCCH may be referred to as the first SCI, the first-level SCI, or the first-level SCI format, and the SCI sent via the PSSCH may be referred to as the second SCI, the second-level SCI, or the second-level SCI format. For example, the first-level SCI format may include SCI format 1-A, and the second-level SCI format may include SCI format 2-A and / or SCI format 2-B.

[0146] Hereinafter, an example of SCI format 1-A will be described.

[0147] SCI format 1-A is used to schedule the second-level SCI on the PSSCH and the PSSCH.

[0148] The following information is sent by means of SCI format 1-A:

[0149] - Priority - 3 bits

[0150] - Frequency resource allocation - When the higher layer parameter sl-MaxNumPerReserve is configured to 2, ceiling(log2(N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, when the higher layer parameter sl-MaxNumPerReserve is configured to 3, ceiling log2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits.

[0151] - Time resource allocation - When the higher layer parameter sl-MaxNumPerReserve is configured to 2, 5 bits; otherwise, when the higher layer parameter sl-MaxNumPerReserve is configured to 3, 9 bits

[0152] - Resource reservation period - If the higher layer parameter sl-MultiReserveResource is configured, ceiling(log2 N rsv_period ) bits, where N rsv_periodis the number of entries in the higher layer parameter sl-ResourceReservePeriodList; otherwise, 0 bits

[0153] - 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

[0154] - Second-level SCI format - 2 bits, as defined in Table 5

[0155] - Beta_offset indicator - 2 bits, as provided by the higher layer parameter sl-BetaOffsets2ndSCI

[0156] - Number of DMRS ports - 1 bit, as defined in Table 6

[0157] - Modulation and coding scheme - 5 bits

[0158] - Additional MCS table indicator - 1 bit if one MCS table is configured by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured by the higher layer parameter sl-Additional-MCS-Table; otherwise, 0 bits

[0159] - PSFCH overhead indication - 1 bit if the higher layer parameter sl-PSFCH-Period = 2 or 4; otherwise, 0 bits

[0160] - Reserved bits - The number of bits determined by the higher layer parameter sl-NumReservedBits, whose value is set to zero.

[0161] [Table 5]

[0162] Value of the second-level SCI format field Second-level SCI format 00 SCI format 2-A 01 SCI format 2-B 10 Reserved 11 Reserved

[0163] [Table 6]

[0164] Value of the number of DMRS port fields Antenna port 0 1000 1 1000 and 1001

[0165] In the following, an example of SCI format 2-A will be described.

[0166] SCI format 2-A is used for decoding the PSSCH and is used together with HARQ operations when the HARQ-ACK information includes ACK or NACK, when the HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.

[0167] The following information is sent using SCI format 2-A:

[0168] - HARQ Process Number - 4 bits

[0169] - New Data Indicator - 1 bit

[0170] - Redundancy Version - 2 bits

[0171] - Source ID - 8 bits

[0172] - Destination ID - 16 bits

[0173] - HARQ Feedback Enable / Disable Indicator - 1 bit

[0174] - Broadcast Type Indicator - 2 bits, defined in Table 7

[0175] - CSI Request - 1 bit

[0176] [Table 7]

[0177] Value of the play type indicator Broadcast type 00 Broadcast 01 Multicast when HARQ-ACK information includes ACK or NACK 10 Unicast 11 Multicast when HARQ-ACK information only includes NACK

[0178] In the following, an example of SCI format 2 - B will be described.

[0179] For HARQ operation, when the HARQ - ACK information includes only NACK, or when there is no feedback of HARQ - ACK information, SCI format 2 - B is used for the decoding of PSSCH.

[0180] The following information is sent by means of SCI format 2 - B:

[0181] - HARQ Process Number - 4 bits

[0182] - New Data Indicator - 1 bit

[0183] - Redundancy Version - 2 bits

[0184] - Source ID - 8 bits

[0185] - Destination ID - 16 bits

[0186] - HARQ Feedback Enable / Disable Indicator - 1 bit

[0187] - Zone ID - 12 bits

[0188] - Communication Range Requirement - 4 bits determined by the higher layer parameter sl - ZoneConfigMCR - Index

[0189] Refer to Figure 8For (a) or (b) above, in step S830, the first UE may receive a PSFCH. For example, the first UE and the second UE may determine a PSFCH resource, and the second UE may use the PSFCH resource to send HARQ feedback to the first UE.

[0190] Referring to Figure 8 For (a) above, in step S840, the first UE may send SL HARQ feedback to the base station via a PUCCH and / or a PUSCH.

[0191] Figure 9 FIG. shows three broadcast types according to an embodiment of the present disclosure. Figure 9 Embodiments of may be combined with various embodiments of the present disclosure. Specifically, Figure 9 (a) in shows broadcast-type SL communication, Figure 9 (b) in shows unicast-type SL communication, and Figure 9 (c) in shows multicast-type SL communication. In the case of unicast-type SL communication, a UE may perform one-to-one communication for another UE. In the case of multicast-type SL transmission, a UE may perform SL communication for one or more UEs belonging to a group to which the UE belongs. In various embodiments of the present disclosure, SL multicast communication may be replaced with SL multiple-cast communication, SL one-to-many communication, etc.

[0192] Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.

[0193] For example, SL HARQ feedback may be enabled for unicast. In this case, in non-codeblock group (non-CBG) operation, if a receiving UE decodes a PSCCH whose target is the receiving UE and if the receiving UE successfully decodes a transport block related to the PSCCH, the receiving UE may generate a HARQ-ACK. In addition, the receiving UE may send the HARQ-ACK to the sending UE. Otherwise, if the receiving UE cannot successfully decode the transport block after decoding the PSCCH whose target is the receiving UE, the receiving UE may generate a HARQ-NACK. In addition, the receiving UE may send the HARQ-NACK to the sending UE.

[0194] For example, SL HARQ feedback may be enabled for multicast. For example, in non-CBG operation, two HARQ feedback options may be supported for multicast.

[0195] (1) Multicast Option 1: After the receiving UE decodes the PSCCH whose target is the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Otherwise, if the receiving UE decodes the PSCCH whose target is the receiving UE and if the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may not send a HARQ-ACK to the transmitting UE.

[0196] (2) Multicast Option 2: After the receiving UE decodes the PSCCH whose target is the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Additionally, if the receiving UE decodes the PSCCH whose target is the receiving UE and if the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may send a HARQ-ACK to the transmitting UE via the PSFCH.

[0197] For example, if Multicast Option 1 is used for SL HARQ feedback, all UEs performing multicast communication can share the PSFCH resources. For example, UEs belonging to the same group can send HARQ feedback by using the same PSFCH resources.

[0198] For example, if Multicast Option 2 is used for SL HARQ feedback, each UE performing multicast communication can use different PSFCH resources for HARQ feedback transmission. For example, UEs belonging to the same group can send HARQ feedback by using different PSFCH resources.

[0199] In the present disclosure, HARQ-ACK may be referred to as ACK, ACK information, or positive ACK information, and HARQ-NACK may be referred to as NACK, NACK information, or negative ACK information.

[0200] Meanwhile, in traditional unlicensed spectrum (NR-U), communication methods between a UE and a base station are supported in an unlicensed band. Additionally, a mechanism for supporting communication between sidelink UEs in an unlicensed band is planned to be supported in Release 18.

[0201] Meanwhile, (equidistant) non-contiguous RBs on a frequency can be allocated to a 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).

[0202] Figure 10 Interleaved RBs according to an embodiment of the present disclosure are shown. Figure 10The embodiments of [the subject matter not specified] can be combined with various embodiments of the present disclosure.

[0203] Referring to Figure 10 , the interleaving of RBs can be defined in the frequency domain. The interleaving m ∈ {0, 1, ..., M - 1} can include (common) RBs {m, M + m, 2M + m, 3M + m, ...}, where M can represent the number of interleaved RBs given by Table 8.

[0204] [Table 8]

[0205] u M 0 10 1 5

[0206] A communication device (e.g., the devices, UEs, vehicles, drones, etc. proposed in various embodiments of the present disclosure) can transmit signals / channels by using one or more interleaved RBs.

[0207] In the present disclosure, a channel can refer to a set of frequency domain resources in which listen-before-talk (LBT) is performed. In NR-U, a channel can refer to an LBT bandwidth of 20 MHz and can have the same meaning as an RB set. For example, the RB set can be defined in Section 7 of 3GPP TS 38.214 V17.0.0.

[0208] In the present disclosure, channel occupancy (CO) can refer to the time / frequency domain resources obtained by a base station or a UE after successful LBT.

[0209] In the present disclosure, channel occupancy time (COT) can refer to the time domain resources obtained by a base station or a UE after successful LBT. It can be shared between the base station (or UE) and the UE (or base station) that obtains the CO, and this can be referred to as COT sharing. Depending on the initiating device, this can be called gNB-initiated COT or UE-initiated COT.

[0210] In the following, a wireless communication system supporting unlicensed bands / shared spectrum will be described.

[0211] Figure 11 An example of a wireless communication system supporting unlicensed bands based on an embodiment of the present disclosure is shown. For example, Figure 11 it can include an unlicensed spectrum (NR-U) wireless communication system. Figure 11 The embodiments of [the subject matter not specified] can be combined with various embodiments of the present disclosure.

[0212] In the following description, a cell operating in a licensed frequency band (hereinafter referred to as the L band) may be defined as an L cell, and the carrier of the L cell may be defined as a (DL / UL / SL) LCC. Additionally, a cell operating in an unlicensed frequency band (hereinafter referred to as the U band) may be defined as a U cell, and the carrier of the U cell may be defined as a (DL / UL / SL) UCC. The carrier / carrier frequency of a cell may refer to the operating frequency of the cell (e.g., the center frequency). A cell / carrier (e.g., CC) is generally referred to as a cell.

[0213] When the base station and the UE transmit and receive signals on the LCC and UCC of carrier aggregation, as Figure 11 shown in (a) of, the LCC and UCC may be configured as the primary CC (PCC) and the secondary CC (SCC), respectively. The base station and the UE may transmit and receive signals on one UCC or multiple carrier-aggregated UCCs, as Figure 11 shown in (b) of. In other words, the base station and the UE may transmit and receive signals only on the UCC without using any LCC. For independent operation, PRACH transmission, PUCCH transmission, PUSCH transmission, SRS transmission, etc. may be supported on the UCell.

[0214] In Figure 11 the embodiment of, the base station may be replaced by the UE. In this case, for example, PSCCH transmission, PSSCH transmission, PSFCH transmission, S-SSB transmission, etc. may be supported on the UCell.

[0215] Unless otherwise specified, the following definitions may apply to the following terms used in this disclosure.

[0216] - Channel: A carrier or a part of a carrier composed of a set of consecutive RBs, where the channel access process is performed in the shared spectrum.

[0217] - Channel Access Process (CAP): A process for evaluating the channel availability based on sensing before signal transmission to determine whether other communication nodes are using the channel. The basic sensing unit is a sensing time slot with a duration of T sl = 9 us. The base station or the UE senses the channel during the sensing time slot duration. If the power detected within at least 4 us during the sensing time slot duration is less than the energy detection threshold X thresh , then the sensing time slot duration T sl is considered idle. Otherwise, the sensing time slot duration T sl = 9 us is considered busy. CAP may also be referred to as Listen Before Talk (LBT).

[0218] - Channel Occupancy: The transmission of the base station / UE on the channel after the channel access process.

[0219] - Channel Occupancy Time (COT): The total time that a base station / UE and any base station / UE sharing the channel can perform transmissions on the channel after the base station / UE executes a channel access procedure. When determining the COT, if the transmission gap is less than or equal to 25 us, the gap duration can be included in the COT. The COT can be shared by the base station and the corresponding UE for transmissions.

[0220] - DL Transmission Burst: A set of transmissions from the base station that do not have any gaps greater than 16 us. Transmissions from the base station separated by a gap greater than 16 us are considered separate DL transmission bursts. In the case where the channel availability is not sensed within the DL transmission burst, the base station can perform transmissions after the gap.

[0221] - UL or SL Transmission Burst: A set of transmissions from the UE that do not have any gaps greater than 16 us. Transmissions from the UE separated by a gap greater than 16 us are considered separate UL or SL transmission bursts. In the case where the channel availability is not sensed within the UL or SL transmission burst, the UE can perform transmissions after the gap.

[0222] - Discovery Burst: A DL transmission burst that includes a set of signals and / or channels that are restricted within a window and associated with a duty cycle. In an LTE-based system, the discovery burst may be a transmission initiated by the base station, which includes the PSS, SSS, and cell-specific RS (CRS), and further includes non-zero power CSI-RS. In an NR-based system, the discovery burst may be a transmission initiated by the base station, which at least includes the SS / PBCH block, and further includes the CORESET of the PDCCH for scheduling the PDSCH carrying SIB1, the PDSCH carrying SIB1, and / or non-zero power CSI-RS.

[0223] Figure 12 Illustrates a method of occupying resources in an unlicensed frequency band based on an embodiment of the present disclosure. Figure 12 The embodiments can be combined with various embodiments of the present disclosure.

[0224] Refer to Figure 12, a communication node (e.g., a base station, a UE) in an unlicensed band should determine whether other communication nodes are using the channel before signal transmission. To this end, a communication node in an unlicensed band can perform a Channel Access Procedure (CAP) to access the channel on which transmission is to be performed. The channel access procedure can be performed based on sensing. For example, a communication node can perform Carrier Sensing (CS) before transmitting a signal, so as to check whether other communication nodes are performing signal transmission. When other communication nodes are not performing signal transmission, that is, Clear Channel Assessment (CCA) is confirmed. If a CCA threshold (e.g., X Thresh ) is predefined or configured by a higher layer (e.g., RRC), then if the detected channel energy is higher than the CCA threshold, the communication node can determine that the channel is busy. Otherwise, the communication node can determine that the channel is idle. If it is determined that the channel is idle, the communication node can initiate signal transmission in the unlicensed band. CAP can be replaced by LBT.

[0225] Table 9 shows an example of the Channel Access Procedure (CAP) supported in NR-U.

[0226] [Table 9]

[0227]

[0228] Referring to Table 9, an LBT type or CAP for DL / UL / SL transmission can be defined. However, Table 9 is only an example, and new types or CAPs can be defined in a similar manner. For example, Type 1 (also known as Cat-4 LBT) can be a channel access procedure based on random backoff. For example, in the case of Cat-4, the contention window may change. For example, in the case of COT sharing within the COT obtained by a base station (gNB) or a UE, Type 2 can be performed.

[0229] Below, LBT-SubBand (SB) (or set of RBs) will be described.

[0230] In a wireless communication system supporting an unlicensed band, a cell (or carrier (e.g., CC)) or BWP configured for a UE can have a wideband with a larger bandwidth (BW) than legacy LTE. However, according to regulations, the BW for CCA that requires independent LBT operation may be restricted. A subband (SB) for which LBT is performed separately is defined as an LBT-SB. Then, a wideband cell / BWP can include multiple LBT-SBs. The set of RBs included in an LBT-SB can be configured by higher layer (e.g., RRC) signaling. Therefore, based on (i) the BW of the cell / BWP and (ii) the RB set allocation information, a cell / BWP can include one or more LBT-SBs.

[0231] Figure 13Shows a situation including multiple LBT-SBs in an unlicensed band based on an embodiment of the present disclosure. Figure 13 Embodiments of Figure 13 can be combined with various embodiments of the present disclosure.

[0232] Referring to Figure 13 , multiple LBT-SBs can be included in the BWP of a cell (or carrier). The LBT-SB can have, for example, a 20 MHz band. The LBT-SB can include multiple consecutive (P)RBs in the frequency domain and can thus be referred to as a set of (P)RBs. Although not shown, a guard band (GB) can be inserted between LBT-SBs. Thus, the BWP can be configured in the form of {LBT-SB#0 (RB set#0) + GB#0 + LBT-SB#1 (RB set#1 + GB#1) +... + LBT-SB#(K - 1) (RB set (#K - 1))}. For convenience, the LBT-SB / RB index can be configured / defined in ascending order from the lowest frequency to the highest frequency.

[0233] Hereinafter, the channel access priority class (CAPC) will be described.

[0234] The CAPC of the MAC CE and radio bearers can be fixed or configured to operate in FR1:

[0235] - Fixed to the lowest priority for filling the buffer status report (BSR) and the recommended bit rate MAC CE;

[0236] - Fixed to the highest priority for SRB0, SRB1, SRB3, and other MAC CEs;

[0237] - Configured by the base station for SRB2 and DRB.

[0238] When selecting the CAPC of the DRB, the base station considers the 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 the standardized 5QI, that is, the CAPC for a given QoS flow. For the standardized 5QI, the CAPC is defined as shown in the following table, and for the non-standardized 5QI, the CAPC with the best QoS characteristics should be used.

[0239] [Table 10]

[0240]

[0241] Hereinafter, a method for transmitting a downlink signal through an unlicensed band will be described. For example, the method for transmitting a downlink signal through an unlicensed band can be applied to the method for transmitting a sidelink signal through an unlicensed band.

[0242] The base station may perform one of the following channel access procedures (e.g., CAP) for downlink signal transmission in an unlicensed band.

[0243] (1) Type 1 downlink (DL) CAP method

[0244] In Type 1 DL CAP, the length of the duration spanned by the sensed time slots sensed as idle before transmission may be random. Type 1 DL CAP may be applied to the following transmissions:

[0245] - Transmissions initiated by the base station, including (i) unicast PDSCH with user plane data or (ii) unicast PDSCH with user plane data and unicast PDCCH scheduling user plane data, or

[0246] - Transmissions initiated by the base station, including (i) discovery bursts only or (ii) discovery bursts multiplexed with non-unicast information.

[0247] Figure 14 Illustrates the CAP operation of the base station transmitting downlink signals through an unlicensed band based on an embodiment of the present disclosure. Figure 14 Embodiments of may be combined with various embodiments of the present disclosure.

[0248] Referring to Figure 14 , the base station may sense whether the channel is idle to sense the sensing delay duration T d of the time slot duration. Then, if the counter N is zero, the base station may perform transmission (S134). In this case, the base station may adjust the counter N by sensing the channel for an additional sensing time slot duration according to the following steps:

[0249] Step 1) (S120) The base station sets N to N init (N = N init ), where N init is a random number uniformly distributed between 0 and CW p . Then, step 4 continues.

[0250] Step 2) (S140) If N > 0 and the base station determines to decrement the counter, the base station sets N to N - 1 (N = N - 1).

[0251] Step 3) (S150) The base station senses the channel for an additional sensing time slot duration. If the additional sensing time slot duration is idle (Y), step 4 continues. Otherwise (N), step 5 continues.

[0252] Step 4) (S130) If N = 0 (Y), the base station terminates the CAP (S132). Otherwise (N), step 2 continues.

[0253] Step 5) (S160) The base station senses the channel until a busy sensing time slot is detected within an additional delay duration T d or all time slots of the additional delay duration T d are detected as idle.

[0254] Step 6) (S170) If the channel is sensed as idle (Y) within all time slot durations of the additional delay duration T d , then Step 4 continues. Otherwise (N), Step 5 continues.

[0255] Table 11 shows that the m p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and the allowed CW size vary depending on the channel access priority class.

[0256] [Table 11]

[0257]

[0258] Referring to Table 11, the contention window size (CWS), maximum COT value, etc. for each CAPC can be defined. For example, T d can be equal to T f + m p * T sl (T d = T f + m p * T sl ).

[0259] The delay duration T d is configured in the following order: duration T f (16 us) + m p consecutive sensing time slot durations T sl (9 us). T f includes the sensing time slot duration T sl at the start of the 16 us duration.

[0260] Satisfy the following relationship: CW min,p <= CW p <= CW max,p . CW p can be configured by CW p = CW min,p and updated (CW size update) based on the HARQ-ACK feedback (e.g., the ratio of ACK or NACK) of the previous DL burst (e.g., PDSCH) before Step 1. For example, CW pIt can be initialized to a CW based on the HARQ-ACK feedback for a previous DL burst. min,p Alternatively, the CW p can be increased to the next higher allowed value or remain as it is.

[0261] (2) Type 2 downlink (DL) CAP method

[0262] In Type 2 DL CAP, the length of the duration spanned by the sensing time slots sensed idle before transmission can be determined. Type 2 DL CAP is classified as Type 2A / 2B / 2C DL CAP.

[0263] Type 2A DL CAP can be applied to the following transmissions. In Type 2A DL CAP, the base station can perform transmission immediately after sensing the channel idle for at least the sensing duration T short_dl = 25 us. Here, T short_dl includes the duration T f (= 16 us) and one sensing time slot duration immediately following the duration T f , where the duration T f includes a sensing time slot at its start.

[0264] - Transmissions initiated by the base station include (i) discovery bursts only or (ii) discovery bursts multiplexed with non-unicast information, or

[0265] - Transmissions made by the base station within the shared channel occupancy after a 25 us transmission interval with the UE.

[0266] Type 2B DL CAP can be applied to transmissions performed by the base station within the shared channel occupancy time after a 16 us transmission interval with the UE. In Type 2B DL CAP, the base station can perform transmission immediately after sensing the channel idle within T f = 16 us. T f includes a sensing time slot within 9 us starting from the end of the duration. Type 2C DL CAP can be applied to transmissions performed by the base station within the shared channel occupancy time after a maximum of 16 us transmission with the UE. In Type 2C DL CAP, the base station does not perform channel sensing before transmission.

[0267] A method for transmitting an uplink signal via an unlicensed band will be described below. For example, the method for transmitting an uplink signal via an unlicensed band can be applied to the method for transmitting a sidelink signal via an unlicensed band.

[0268] The UE can perform type 1 or type 2 CAP for UL signal transmission in the unlicensed band. Generally, the UE can perform the CAP (e.g., type 1 or type 2) configured by the base station for UL signal transmission. For example, the UL grant (e.g., DCI format 0_0 and 0_1) scheduling the PUSCH transmission can include the CAP type indication information for the UE.

[0269] (1) Type 1 uplink (UL) CAP method

[0270] In type 1 UL CAP, the duration length spanned by the sensed time slots sensed as idle before transmission is random. Type 1 UL CAP can be applied to the following transmissions.

[0271] - PUSCH / SRS transmission scheduled and / or configured by the base station

[0272] - PUCCH transmission scheduled and / or configured by the base station

[0273] - Transmissions related to the random access procedure (RAP)

[0274] Figure 15 Illustrates type 1 CAP operation performed by the UE to send an uplink signal based on an embodiment of the present disclosure. Figure 15 The embodiments of can be combined with various embodiments of the present disclosure.

[0275] Referring to Figure 15 , the UE can sense whether the channel is idle to sense the deferral duration T d of the time slot duration. Then, if the counter N is zero, the UE can perform the transmission (S234). In this case, the UE can adjust the counter N by sensing the channel within an additional sensed time slot duration according to the following steps:

[0276] Step 1) (S220) The UE sets N to N init (N = N init ), where N init is a random number uniformly distributed between 0 and CW p . Then, step 4 continues.

[0277] Step 2) (S240) If N > 0 and the UE determines to decrement the counter, the UE sets N to N - 1 (N = N - 1).

[0278] Step 3) (S250) The UE senses the channel within the additional sensed time slot duration. If the additional sensed time slot duration is idle (yes), step 4 continues. Otherwise (no), step 5 continues.

[0279] Step 4) (S230) If N = 0 (Yes), the UE terminates the CAP (S232). Otherwise (No), proceed to Step 2.

[0280] Step 5) (S260) The UE senses the channel until a busy sensing time slot is detected within an additional deferral duration T d or all time slots of the additional deferral duration T d are detected as idle.

[0281] Step 6) (S270) If the channel is sensed as idle (Yes) during all time slot durations of the additional deferral duration T d , then proceed to Step 4. Otherwise (No), proceed to Step 5.

[0282] Table 12 shows that m p , the minimum CW, the maximum CW, the maximum channel occupancy time (MCOT), and the allowed CW size vary depending on the channel access priority class.

[0283] [Table 12]

[0284]

[0285] Referring to Table 12, the contention window size (CWS), the maximum COT value, etc. can be defined for each CAPC. For example, T d can be equal to T f + m p * T sl (T d = T f + m p * T sl ).

[0286] The deferral duration T d is configured in the following order: the duration T f (16 us) + m p consecutive sensing time slot durations T sl (9 us). T f includes the sensing time slot duration T sl at the start of the 16 us duration.

[0287] Satisfies the following relationship: CW min,p <= CW p <= CW max,p . CW p can be determined by CW p = CW min,pconfigured and updated (CW size update) based on an explicit / implicit reception response to a previous UL burst (e.g., PUSCH) before step 1. For example, the CW p can be initialized to CW min,p . Alternatively, the CW p can be increased to the next higher allowed value or remain the same.

[0288] (2) Type 2 Uplink (UL) CAP Method

[0289] In Type 2 UL CAP, the length of the duration spanned by the sensed idle sensing time slots before transmission can be determined. Type 2 UL CAP is classified as Type 2A / 2B / 2C UL CAP. In Type 2A UL CAP, the UE can perform transmission immediately after sensing the channel idle for at least a sensing duration T short_dl = 25 us. Here, T short_dl includes a duration T f (= 16 us) and a sensing time slot duration immediately following the duration T f . In Type 2A UL CAP, T f includes a sensing time slot at its start. In Type 2B UL CAP, the UE can perform transmission immediately after sensing the channel idle for a sensing duration T f = 16 us. In Type 2B UL CAP, T f includes a sensing time slot within 9 us starting from the end of the duration. In Type 2C UL CAP, the UE does not perform channel sensing before transmission.

[0290] For example, according to Type 1 LBT-based NR-U operation, a UE having uplink data to send can select a CAPC for the 5QI mapped to the data, and the UE can perform NR-U operation by applying the parameters of the corresponding CACP (e.g., minimum contention window size, maximum contention window size, mp, etc.). For example, after selecting a random value between the minimum CW and the maximum CW mapped to the CAPC, the UE can select a backoff counter (BC) between zero and the random value. In this case, for example, the BC can be a positive integer less than or equal to the random value. If the channel is idle, the UE sensing the channel decrements the BC by 1. If the BC becomes zero and the UE is in time T d (T d = T f + m p * T sl) If the channel is detected to be idle within, the UE can attempt to send data by occupying the channel. If the UE attempting to send data detects a collision, the UE can increase the CW size mapped to the CAPC, and the UE can reselect the BC between zero and the increased CW. The UE that successfully transmits a packet can initialize the CW size (to the CW minimum).

[0291] For example, T sl (= 9 microseconds) is the basic sensing unit or sensing time slot, and can include a measurement duration of at least 4 microseconds. For example, T f (= 16 microseconds), the first 9 microseconds can be configured as T sl . For example, m p can be a constant mapped for each CAPC and used in the calculation of T d . For example, a smaller value can be mapped to a lower CACP value (higher priority).

[0292] For example, according to the NR-U operation based on type 2 LBT, the UE can send data by performing type 2 LBT (e.g., type 2A LBT, type 2B LBT, or type 2C LBT) within the COT.

[0293] For example, type 2A (also known as Cat-2 LBT (one-shot LBT) or one-shot LBT) can be a 25-microsecond one-shot LBT. In this case, the transmission can start immediately after sensing the channel idle within at least a 20-microsecond gap. Type 2A can be used to initiate the transmission of SSB and non-unicast DL information. That is, the UE can sense the channel within 25 microseconds in the COT, and if the channel is idle, the UE can attempt to send data by occupying the channel.

[0294] For example, type 2B can be a 16-microsecond one-shot LBT. In this case, the transmission can start immediately after sensing the channel idle within a 16-microsecond gap. That is, the UE can sense the channel within 16 microseconds in the COT, and if the channel is idle, the UE can attempt to send data by occupying the channel.

[0295] For example, in the case of type 2C (also known as Cat-1 LBT or no LBT), LBT may not be performed. In this case, the transmission can start immediately after a gap of up to 16 microseconds, and the channel may not be sensed before the transmission. The duration of the transmission can be up to 584 microseconds. The UE can attempt to transmit after 16 microseconds without sensing, and the UE can perform the transmission within up to 584 microseconds.

[0296] In the side-link unlicensed band, the UE can perform channel access operations based on Listen Before Talk (LBT). Before the UE accesses a channel in the unlicensed band, the UE should check whether the channel to be accessed is idle (e.g., a state where the UE does not occupy the channel, a state where the UE can access the corresponding channel and send data) or busy (e.g., a state where the channel is occupied and data transmission / reception is being performed on the corresponding channel, and the UE attempting to access the channel cannot send data while the channel is busy). That is to say, the operation where the UE checks whether the channel is idle or busy can be referred to as Clear Channel Assessment (CCA), and the UE can check whether the channel is idle or busy within the CCA duration.

[0297] Figure 16 The figure shows a channel access process according to an embodiment of the present disclosure. Specifically, Figure 16 The (a) of the figure shows an example of a dynamic channel access process (Load-Based Equipment, LBE), Figure 16 The (b) of the figure shows an example of a semi-static channel access process (Frame-Based Equipment, FBE). Figure 16 The embodiments of the figure can be combined with various embodiments of the present disclosure.

[0298] Referring to Figure 16 The (a) of the figure, if the channel is idle, the UE can contend with other UEs on the unlicensed band to immediately occupy the channel. Additionally, if the UE occupies the channel, the UE can send data.

[0299] Referring to Figure 16 The (b) of the figure, the UE can contend with other UEs on the unlicensed band at the last time within the synchronization frame boundary (or Fixed Frame Period (FFP)) (e.g., at a certain time (or start time) before the start of the next FFP). In addition, if the UE occupies the channel within the Fixed Frame Period (FFP), the UE can send data. The data transmission should be completed before the start of the next FFP. The UE can perform Type 2 series LBT operations within the FFP. For example, within the FFP, the UE can not perform LBT based on random backoff, and the UE can sense the channel for a short period of time and perform data transmission when the channel is idle.

[0300] The side-link DRX configuration disclosed in the present disclosure can include at least one of the following parameters.

[0301] - SL drx-onDurationTimer: The duration at the start of the SL DRX cycle;

[0302] - SL drx-SlotOffset: The delay before starting the sl drx-onDurationTimer;

[0303] - SL drx-InactivityTimer: The duration after a PSCCH occasion, where the PSCCH indicates a new SL transmission for the MAC entity;

[0304] - SL drx-StartOffset: The subframe at which the SL DRX cycle starts;

[0305] - SL drx-Cycle: The SL DRX cycle;

[0306] - SL drx-HARQ-RTT-Timer (per HARQ process or per sidelink process): The minimum duration that the MAC entity expects before the assignment for HARQ retransmission;

[0307] - SL drx-RetransmissionTimer (per HARQ process or per sidelink process): The maximum duration until a retransmission is received.

[0308] The Uu DRX configurations disclosed in this disclosure may include at least one of the following parameters.

[0309] - drx-onDurationTimer: The duration at the start of the DRX cycle;

[0310] - drx-SlotOffset: The delay before starting the drx-onDurationTimer;

[0311] - drx-InactivityTimer: The duration after a PDCCH occasion, where the PDCCH indicates a new UL or DL transmission for the MAC entity;

[0312] - drx-RetransmissionTimerDL (per DL HARQ process except for the broadcast process): The maximum duration until a DL retransmission is received;

[0313] - drx-RetransmissionTimerUL (per UL HARQ process): The maximum duration until authorization for UL retransmission is received;

[0314] - drx-LongCycleStartOffset: The long DRX cycle and drx-StartOffset, which define the subframes at which the long DRX cycle and the short DRX cycle start;

[0315] - drx-ShortCycle (optional): The short DRX cycle;

[0316] -drx-ShortCycleTimer (optional): The UE shall follow the duration of the short DRX cycle;

[0317] -drx-HARQ-RTT-TimerDL (for each DL HARQ process except for broadcast processes): The minimum duration before which the MAC entity expects a DL assignment for HARQ retransmission;

[0318] -drx-HARQ-RTT-TimerUL (for each UL HARQ process): The minimum duration before which the MAC entity expects a UL HARQ retransmission grant;

[0319] -drx-RetransmissionTimerSL (for each SL HARQ process): The maximum duration until an authorization for SL retransmission is received;

[0320] -drx-HARQ-RTT-TimerSL (for each SL HARQ process): The minimum duration before which the MAC entity expects an SL retransmission grant;

[0321] -ps-Wakeup (optional): The configuration for starting the associated drx-onDurationTimer in case the DCP is monitored but not detected;

[0322] -ps-TransmitOtherPeriodicCSI (optional): The configuration for reporting periodic CSI other than L1-RSRP on the PUCCH during the duration indicated by the drx-onDurationTimer in case the DCP is configured but the associated drx-onDurationTimer is not started;

[0323] -ps-TransmitPeriodicL1-RSRP (optional): The configuration for transmitting periodic CSI as L1-RSRP on the PUCCH during the duration indicated by the drx-onDurationTimer in case the DCP is configured but the associated drx-onDurationTimer is not started.

[0324] The Uu DRX timers disclosed in this disclosure can be used for the following purposes.

[0325] -drx-HARQ-RTT-TimerSL timer: The duration during which a TXUE (UE supporting Uu DRX operation) performing sidelink communication based on sidelink resource allocation mode 1 does not monitor the PDCCH (or DCI) for sidelink mode 1 resource allocation from the base station.

[0326] - The drx-RetransmissionTimerSL timer: The duration for a TX UE (UE supporting Uu DRX operation) performing sidelink communication based on sidelink resource allocation mode 1 to monitor the PDCCH (or DCI) for sidelink mode 1 resource allocation from the base station.

[0327] The sidelink DRX timers disclosed in this disclosure can be used for the following purposes.

[0328] - The sidelink DRX Onduration (on duration) timer: The duration for a UE performing sidelink DRX operation to operate substantially in the Active Time mode to receive PSCCH / PSSCH from a peer UE.

[0329] - The sidelink DRX Inactivity timer: The duration that extends the sidelink DRX Onduration duration, which is the duration for a UE performing sidelink DRX operation to operate substantially in the Active Time mode to receive PSCCH / PSSCH from a peer UE. For example, the sidelink DRX Onduration timer can be extended by up to the duration of the sidelink DRX Inactivity timer. For example, if the UE receives a PSCCH for a new TB from a peer UE, the UE can start the sidelink DRX Inactivity timer and extend the sidelink DRX Onduration timer. For example, if the UE receives a first SCI and a second SCI for a new TB from a peer UE, the UE can start the sidelink DRX Inactivity timer and extend the sidelink DRX Onduration timer. For example, if the UE receives a new packet (new PSSCH transmission), the UE can start the sidelink DRX Inactivity timer and extend the sidelink DRX Onduration timer.

[0330] - Sidelink DRX HARQ RTT Timer: The UE performing sidelink DRX operation operates in the sleep mode until the duration when the UE receives a retransmitted packet (or PSSCH allocation) sent by the peer UE. For example, if the UE starts the sidelink DRX HARQ RTT Timer, the UE can determine that the peer UE does not send a sidelink retransmitted packet to the UE until the sidelink DRX HARQ RTT Timer expires, and can operate in the sleep mode during the corresponding timer period. For example, if the UE starts the sidelink DRX HARQ RTT Timer, the UE determines that the peer UE does not transmit a sidelink retransmitted packet to the UE until the sidelink DRX HARQ RTT Timer expires, and can refrain from monitoring the sidelink channel / signals sent by the TX UE.

[0331] - Sidelink DRX Retransmission Timer: The UE performing sidelink DRX operation operates in the active time mode for the duration of receiving the retransmitted packet sent by the peer UE. For example, the UE performing sidelink DRX operation operates in the active time mode for the duration of receiving the PSSCH assignment sent by the peer UE. During the corresponding timer duration, the UE can monitor the reception of the sidelink packet retransmitted by the peer UE. For example, during the corresponding timer duration, the UE can monitor the reception of the retransmitted PSSCH assignment sent by the peer UE.

[0332] In this disclosure, the names of the timers (Uu DRX HARQ RTT TimerSL, Uu DRX Retransmission TimerSL, Sidelink DRX Onduration Timer, Sidelink DRX Inactdivity Timer, Sidelink DRX HARQ RTT Timer, Sidelink DRX Retransmission Timer, etc.) are examples, and timers that perform the same / similar functions based on this disclosure described in each timer can be considered the same / similar timers regardless of their names.

[0333] In the sidelink unlicensed band, the UE senses whether the channel of the sidelink unlicensed band is idle or busy by performing the LBT operation to send sidelink data, and if the channel is idle (e.g., LBT is successful), the UE can send sidelink data by occupying the channel of the sidelink unlicensed band. If the LBT operation fails, the UE may not be able to send sidelink data in the sidelink unlicensed band.

[0334] For example, if transmitting sidelink data, the sidelink transmitting UE may schedule the timing (or opportunity) of a Physical Sidelink Feedback Channel (PSFCH) associated with the PSCCH / PSSCH of the sidelink data to be multiple PSFCH timings (multi-PSFCH timings).

[0335] For example, after receiving a MAC PDU with HARQ feedback enabled (HARQ Feedback Enabled MAC PDU) from the transmitting UE (e.g., in the first time slot after the end of the corresponding PSFCH transmission carrying SL HARQ feedback), the receiving UE performing sidelink DRX operation may start the sl-drx-HARQ-RTT-Timer.

[0336] For example, after receiving a HARQ feedback enabled MAC PDU from the transmitting UE, the receiving UE performing sidelink DRX operation may start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the corresponding PSFCH transmission carrying SL HARQ feedback.

[0337] For example, for PSFCH transmissions in an unlicensed band, multiple PSFCH timings may be supported. For example, to mitigate the problem of (fully) skipping PSFCH transmissions due to LBT failures, multiple PSFCH timings (on different time resources) may be mapped to one PSSCH time slot.

[0338] For example, in sidelink communication in an unlicensed band, if a PSFCH cannot be transmitted due to an LBT failure in a multi-PSFCH resource (multi-PSFCH timing), it may be necessary to determine when to start the sidelink HARQ RTT timer.

[0339] Figure 17 Embodiments showing multiple PSFCH timings for each PSCCH / PSSCH based on embodiments of the present disclosure are presented. Figure 17 Embodiments may be combined with various embodiments of the present disclosure.

[0340] Referring to Figure 17 , the multi-PSFCH timing may be associated with one PSCCH / PSSCH. For example, the multi-PSFCH timing for one PSCCH / PSSCH may be determined by a time gap. For example, the time gap may be the minimum time gap between the PSFCH and the PSCCH / PSSCH (e.g., sl-MinTimeGapPSFCH).

[0341] For example, the UE may start the sl-drx-HARQ-RTT-Timer at the last PSFCH occasion among multiple PSFCH occasions. For example, the UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the corresponding last PSFCH occasion carrying the SL HARQ feedback ends. For example, the UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the time slot in which there are multiple PSFCH resources ends. For example, the UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the time slot in which there is the last PSFCH resource ends. For example, the UE may start the sl-drx-HARQ-RTT-Timer after the PSFCH transmission corresponding to the successful transmission of the PSFCH among multiple PSFCH occasions. For example, when the PSFCH is successfully transmitted, the UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the corresponding PSFCH transmission. For example, the UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the time slot in which the PSFCH transmission corresponding to the successful transmission of the PSFCH ends.

[0342] In the present disclosure, if the receiving UE related to the SL DRX operation that performs LBT for PSFCH transmission in the sidelink unlicensed band is scheduled or configured for multiple PSFCH occasions, the start operation of the sl-drx-HARQ-RTT-Timer is proposed as follows. For example, the start time of the sl-drx-HARQ-RTT-Timer of the receiving UE is proposed as follows.

[0343] According to the present disclosure, if multiple PSFCH occasions are scheduled or configured for the receiving UE related to the SL DRX operation that performs LBT for PSFCH transmission in the sidelink unlicensed band, after receiving the PSCCH / PSSCH from the transmitting UE, the receiving UE may always start the sl-drx-HARQ-RTT-Timer at the last PSFCH occasion among the multiple PSFCH occasions, regardless of whether the LBT (e.g., HARQ ACK or HARQ NACK) for the PSFCH transmission is successful or not in the multiple PSFCH occasions (e.g., when the PSFCH is transmitted due to successful LBT, or when the PSFCH is not transmitted due to failed LBT).

[0344] For example, if scheduling or configuring multiple-PSFCH opportunities for a receiving UE related to SL DRX operations that perform LBT for PSFCH transmission in a sidelink unlicensed band, after receiving PSCCH / PSSCH from a transmitting UE, the receiving UE can always start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the corresponding last PSFCH opportunity carrying SL HARQ feedback, regardless of whether the LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) is successful or not in the multiple-PSFCH opportunity (e.g., when the PSFCH is transmitted due to successful LBT, or when the PSFCH is not transmitted due to failed LBT).

[0345] For example, if scheduling or configuring multiple-PSFCH opportunities for a receiving UE related to SL DRX operations that perform LBT for PSFCH transmission in a sidelink unlicensed band, after receiving PSCCH / PSSCH from a transmitting UE, the receiving UE can always start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the time slot where there are multiple PSFCH resources, regardless of whether the LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) is successful or not in the multiple-PSFCH opportunity (e.g., when the PSFCH is transmitted due to successful LBT, or when the PSFCH is not transmitted due to failed LBT).

[0346] For example, if scheduling or configuring multiple-PSFCH opportunities for a receiving UE related to SL DRX operations that perform LBT for PSFCH transmission in a sidelink unlicensed band, after receiving PSCCH / PSSCH from a transmitting UE, the receiving UE can always start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the time slot where the last PSFCH resource exists, regardless of whether the LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) is successful or not in the multiple-PSFCH opportunity (e.g., when the PSFCH is transmitted due to successful LBT, or when the PSFCH is not transmitted due to failed LBT).

[0347] For example, if multiple PSFCH opportunities are scheduled or configured for a receiving UE related to SL DRX operations that perform LBT for PSFCH transmission in a sidelink unlicensed band, then after receiving PSCCH / PSSCH from a transmitting UE, the receiving UE may always start the sl-drx-HARQ-RTT-Timer after the PSFCH transmission corresponding to when the PSFCH is successfully sent among the multiple PSFCH opportunities, regardless of whether the LBT for the PSFCH transmission (e.g., HARQ ACK or HARQ NACK) is successful or not in the multiple PSFCH opportunities (e.g., when the PSFCH is sent due to successful LBT, or when the PSFCH is not sent due to failed LBT).

[0348] For example, if multiple PSFCH opportunities are scheduled or configured for a receiving UE related to SL DRX operations that perform LBT for PSFCH transmission in a sidelink unlicensed band, then after receiving PSCCH / PSSCH from a transmitting UE, the receiving UE may always start the sl-drx-HARQ-RTT-Timer in the first time slot after the PSFCH transmission corresponding to when the PSFCH is successfully sent, regardless of whether the LBT for the PSFCH transmission (e.g., HARQ ACK or HARQ NACK) is successful or not in the multiple PSFCH opportunities (e.g., when the PSFCH is sent due to successful LBT, or when the PSFCH is not sent due to failed LBT).

[0349] For example, if multiple PSFCH opportunities are scheduled or configured for a receiving UE related to SL DRX operations that perform LBT for PSFCH transmission in a sidelink unlicensed band, then after receiving PSCCH / PSSCH from a transmitting UE, the receiving UE may always start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the time slot in which the PSFCH transmission corresponding to when the PSFCH is successfully sent is located, regardless of whether the LBT for the PSFCH transmission (e.g., HARQ ACK or HARQ NACK) is successful or not in the multiple PSFCH opportunities (e.g., when the PSFCH is sent due to successful LBT, or when the PSFCH is not sent due to failed LBT).

[0350] According to the present disclosure, if a receiving UE experiences a LBT failure for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) in some of the multi-PSFCH opportunities (e.g., PSFCH opportunities configured earlier than the last PSFCH opportunity) after receiving PSCCH / PSSCH from a transmitting UE (e.g., does not transmit PSFCH due to LBT failure), and transmits PSFCH due to a successful LBT in the last opportunity among the multi-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer at the last PSFCH opportunity among the multi-PSFCH opportunities.

[0351] For example, if a receiving UE experiences a LBT failure for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) in some of the multi-PSFCH opportunities (e.g., PSFCH opportunities configured earlier than the last PSFCH opportunity) after receiving PSCCH / PSSCH from a transmitting UE (e.g., does not transmit PSFCH due to LBT failure), and transmits PSFCH due to a successful LBT in the last opportunity among the multi-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the corresponding last PSFCH opportunity carrying the SL HARQ feedback.

[0352] For example, if a receiving UE experiences a LBT failure for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) in some of the multi-PSFCH opportunities (e.g., PSFCH opportunities configured earlier than the last PSFCH opportunity) after receiving PSCCH / PSSCH from a transmitting UE (e.g., does not transmit PSFCH due to LBT failure), and transmits PSFCH due to a successful LBT in the last opportunity among the multi-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the time slot in which there are multiple PSFCH resources.

[0353] For example, if the receiving UE fails in LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) in some of the multiple-PSFCH opportunities (e.g., PSFCH opportunities configured earlier than the last PSFCH opportunity) after receiving PSCCH / PSSCH from the transmitting UE (e.g., does not send PSFCH due to LBT failure), and sends PSFCH due to successful LBT in the last opportunity among the multiple-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the time slot in which the last PSFCH resource exists.

[0354] For example, if the receiving UE fails in LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) in some of the multiple-PSFCH opportunities (e.g., PSFCH opportunities configured earlier than the last PSFCH opportunity) after receiving PSCCH / PSSCH from the transmitting UE (e.g., does not send PSFCH due to LBT failure), and sends PSFCH due to successful LBT in the last opportunity among the multiple-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer after the PSFCH transmission corresponding to when the PSFCH is successfully sent among the multiple-PSFCH opportunities.

[0355] For example, if the receiving UE fails in LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) in some of the multiple-PSFCH opportunities (e.g., PSFCH opportunities configured earlier than the last PSFCH opportunity) after receiving PSCCH / PSSCH from the transmitting UE (e.g., does not send PSFCH due to LBT failure), and sends PSFCH due to successful LBT in the last opportunity among the multiple-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the PSFCH transmission corresponding to when the PSFCH is successfully sent.

[0356] For example, if the receiving UE experiences a LBT failure for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) in some of the multi-PSFCH opportunities (e.g., PSFCH opportunities configured earlier than the last PSFCH opportunity) after receiving the PSCCH / PSSCH from the transmitting UE (e.g., the PSFCH is not sent due to the LBT failure), and the PSFCH is sent due to a successful LBT in the last opportunity among the multi-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the time slot corresponding to the PSFCH transmission when the PSFCH is successfully sent.

[0357] According to the present disclosure, even if the receiving UE has a successful LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) after receiving the PSCCH / PSSCH from the transmitting UE, and the receiving UE sends the PSFCH in a PSFCH opportunity among the multi-PSFCH opportunities other than the last opportunity (e.g., a PSFCH opportunity configured earlier than the last PSFCH opportunity), the receiving UE may start the sl-drx-HARQ-RTT-Timer at the last PSFCH opportunity among the multi-PSFCH opportunities.

[0358] For example, according to the present disclosure, even if the receiving UE has a successful LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) after receiving the PSCCH / PSSCH from the transmitting UE, and the receiving UE sends the PSFCH in a PSFCH opportunity among the multi-PSFCH opportunities other than the last opportunity (e.g., a PSFCH opportunity configured earlier than the last PSFCH opportunity), the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the corresponding last PSFCH opportunity carrying the SL HARQ feedback.

[0359] For example, even if the receiving UE has a successful LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) after receiving the PSCCH / PSSCH from the transmitting UE, and the receiving UE sends the PSFCH in a PSFCH opportunity among the multi-PSFCH opportunities other than the last opportunity (e.g., a PSFCH opportunity configured earlier than the last PSFCH opportunity), the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the time slot in which there are multiple PSFCH resources.

[0360] For example, even if the receiving UE succeeds in LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) after receiving PSCCH / PSSCH from the transmitting UE, and the receiving UE transmits PSFCH in a PSFCH opportunity among multiple PSFCH opportunities other than the last opportunity (e.g., a PSFCH opportunity configured earlier than the last PSFCH opportunity), the receiving UE may also start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the time slot in which the last PSFCH resource exists.

[0361] For example, even if the receiving UE succeeds in LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) after receiving PSCCH / PSSCH from the transmitting UE, and the receiving UE transmits PSFCH in a PSFCH opportunity among multiple PSFCH opportunities other than the last opportunity (e.g., a PSFCH opportunity configured earlier than the last PSFCH opportunity), the receiving UE may also start the sl-drx-HARQ-RTT-Timer after the PSFCH transmission corresponding to the successful transmission of PSFCH among multiple PSFCH opportunities.

[0362] For example, even if the receiving UE succeeds in LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) after receiving PSCCH / PSSCH from the transmitting UE, and the receiving UE transmits PSFCH in a PSFCH opportunity among multiple PSFCH opportunities other than the last opportunity (e.g., a PSFCH opportunity configured earlier than the last PSFCH opportunity), the receiving UE may also start the sl-drx-HARQ-RTT-Timer in the first time slot after the PSFCH transmission corresponding to the successful transmission of PSFCH.

[0363] For example, even if the receiving UE succeeds in LBT for PSFCH transmission (e.g., HARQ ACK or HARQ NACK) after receiving PSCCH / PSSCH from the transmitting UE, and the receiving UE transmits PSFCH in a PSFCH opportunity among multiple PSFCH opportunities other than the last opportunity (e.g., a PSFCH opportunity configured earlier than the last PSFCH opportunity), the receiving UE may also start the sl-drx-HARQ-RTT-Timer in the first time slot after the end of the time slot of the PSFCH transmission corresponding to the successful transmission of PSFCH.

[0364] According to the present disclosure, if the receiving UE does not send a PSFCH because LBT fails in all multi-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer at the last PSFCH opportunity among the multi-PSFCH opportunities.

[0365] For example, if the receiving UE does not send a PSFCH because LBT fails in all multi-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the corresponding last PSFCH opportunity carrying the SL HARQ feedback ends.

[0366] For example, if the receiving UE does not send a PSFCH because LBT fails in all multi-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the time slot in which there are multiple PSFCH resources ends.

[0367] For example, if the receiving UE does not send a PSFCH because LBT fails in all multi-PSFCH opportunities, the receiving UE may start the sl-drx-HARQ-RTT-Timer in the first time slot after the time slot in which there are the last PSFCH resources ends.

[0368] In the present disclosure, if the transmission of SL HARQ feedback fails in all multi-PSFCH opportunities, by starting the sidelink HARQ RTT timer after the last PSFCH resource of the multi-PSFCH opportunity, power waste caused by starting the HARQ retransmission timer during a duration in which retransmission is not possible because it is started after the PSFCH resource instead of after the last PSFCH resource of the multi-PSFCH opportunity can be prevented.

[0369] In the present disclosure, if a PSFCH is sent in a multi-PSFCH opportunity, by starting the sidelink HARQ RTT timer after the successfully transmitted PSFCH resource in the multi-PSFCH resource (multi-PSFCH opportunity), power waste caused by starting the sidelink HARQ RTT timer before the successfully transmitted PSFCH resource in the multi-PSFCH resource and starting the HARQ retransmission timer during a period in which retransmission is not available can be prevented.

[0370] In the present disclosure, if a PSFCH is transmitted in a multi-PSFCH occasion, by starting a sidelink HARQ RTT timer after the successfully transmitted PSFCH resource in the multi-PSFCH resource (multi-PSFCH occasion), sidelink communication failure caused by the late start of the HARQ retransmission timer due to starting the sidelink HARQ RTT timer after the last PSFCH resource in the multi-PSFCH occasion can be prevented.

[0371] Even if the receiving UE uses one of the multiple PSFCH occasions (e.g., an intermediate resource among the multiple PSFCH occasions) to transmit the PSFCH due to the successful LBT of the receiving UE, the transmitting UE cannot guarantee the complete reception of the PSFCH. The complete reception can be 100% reception.

[0372] By understanding the DRX operation of the receiving UE, the transmitting UE should perform SL transmissions during the SL DRX active time of the receiving UE and should not perform SL transmissions during the SL DRX inactive time of the receiving UE. Therefore, the transmitting UE should be aligned with the SL DRX timer operation of the receiving UE. The SL DRX active time can be the duration during which the receiving UE monitors the PSCCH / PSSCH to receive the SL data of the transmitting UE, and the SL DRX inactive time can be the duration during which the receiving UE does not monitor the PSCCH / PSSCH to receive the SL data of the transmitting UE.

[0373] According to the present disclosure, if the transmitting UE schedules multiple PSFCH occasions for the receiving UE for PSSCH, the following proposals for starting the sl-drx-HARQ-RTT-Timer for the transmitting UE are provided.

[0374] Regardless of whether the receiving UE successfully performs LBT for PSFCH transmission (e.g., when the PSFCH is transmitted due to successful LBT, or when the PSFCH is not transmitted due to failed LBT), the transmitting UE can always start the sl-drx-HARQ-RTT-Timer at the last PSFCH occasion among the multi-PSFCH occasions. The PSFCH transmission can include information related to HARQ ACK. The PSFCH transmission can include information related to HARQ NACK.

[0375] For example, the transmitting UE may always start the sl-drx-HARQ-RTT-Timer in the first time slot after the corresponding last PSFCH occasion carrying the SL HARQ feedback ends, regardless of whether the LBT of the receiving UE for the PSFCH transmission is successful (e.g., when the PSFCH is transmitted due to successful LBT, or when the PSFCH is not transmitted due to failed LBT). The PSFCH transmission may include information related to HARQ ACK. The PSFCH transmission may include information related to HARQ NACK. The SL HARQ feedback may be the SL HARQ feedback of the receiving UE.

[0376] For example, the transmitting UE may always start the sl-drx-HARQ-RTT-Timer in the first time slot after the time slot in which there are multiple PSFCH resources ends, regardless of whether the LBT of the receiving UE for the PSFCH transmission is successful (e.g., when the PSFCH is transmitted due to successful LBT, or when the PSFCH is not transmitted due to failed LBT). The PSFCH transmission may include information related to HARQ ACK. The PSFCH transmission may include information related to HARQ NACK.

[0377] For example, the transmitting UE may always start the sl-drx-HARQ-RTT-Timer in the first time slot after the time slot in which there is the last PSFCH resource ends, regardless of whether the LBT of the receiving UE for the PSFCH transmission is successful (e.g., when the PSFCH is transmitted due to successful LBT, or when the PSFCH is not transmitted due to failed LBT). The PSFCH transmission may include information related to HARQ ACK. The PSFCH transmission may include information related to HARQ NACK.

[0378] For example, the transmitting UE may start the sl-drx-HARQ-RTT-Timer based on the time of PSFCH detection from the multi-PSFCH occasion.

[0379] For example, if the transmitting UE receives the PSFCH at the last occasion among the multi-PSFCH occasions, the transmitting UE may start the sl-drx-HARQ-RTT-Timer based on the time of the PSFCH at the last occasion among the multi-PSFCH occasions.

[0380] For example, if the transmitting UE receives the PSFCH at the first occasion in the multi-PSFCH occasions, the transmitting UE may start the sl-drx-HARQ-RTT-Timer based on the time of the PSFCH at the first occasion among the multi-PSFCH occasions.

[0381] In various embodiments of the present disclosure, "channel" can be applied by replacing it with "carrier" or "set of resource blocks of a specific carrier" or "frequency band".

[0382] For example, it can be configured (differently or independently) for each SL channel access priority class (CAPC) whether to apply some of the proposed methods / rules and / or related parameters (such as thresholds) of the present disclosure. For example, it can be configured (differently or independently) for each type of SL-LBT (such as type 1 LBT, type 2A LBT, type 2B LBT, type 2C LBT) whether to apply some of the proposed methods / rules and / or related parameters (such as thresholds) of the present disclosure. For example, it can be specifically (or differently or independently) configured whether to apply some of the proposed methods / rules and / or related parameters (such as thresholds) of the present disclosure depending on whether frame-based LBT (FBE) is applied. For example, it can be specifically (or differently or independently) configured whether to apply some of the proposed methods / rules and / or related parameters (such as thresholds) of the present disclosure depending on whether load-based LBT (LBE) is applied.

[0383] For example, it can be specifically (or differently or independently) configured some of the proposed schemes / rules and / or related parameters (such as thresholds) of the present disclosure based on whether LBT is successful / failed, the energy detection level related to each LBT, each sidelink channel (PSCCH / PSSCH, PSFCH, SL-SSB), based on whether multi-consecutive slot transmission (MCSt) is applied, based on whether multi-PSFCH resources (multi-PSFCH opportunities) are applied, based on the resource order / position composed of MCSt, based on whether multiple starting points are configured within one slot, based on whether the first starting point (or the second starting point) is applied, etc.

[0384] For example, it can be configured (differently or independently) for each resource pool whether to apply some of the proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure. For example, it can be configured (differently or independently) for each congestion level whether to apply some of the proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure. For example, it can be configured (differently or independently) for each service priority whether to apply some of the proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure. For example, it can be configured (differently or independently) for each service type whether to apply some of the proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure. For example, it can be configured (differently or independently) for each QoS requirement (e.g., latency, reliability) whether to apply some of the proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure. For example, it can be configured (differently or independently) for each PQI (5G QoS identifier (5QI) for PC5) whether to apply some of the proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure. For example, it can be configured (differently or independently) for each traffic type (e.g., periodically generated or aperiodically generated) whether to apply some of the proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure. For example, it can be configured (differently or independently) for each SL transmission resource allocation mode (e.g., mode 1 or mode 2) whether to apply some of the proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure. For example, it can be configured (differently or independently) for each Tx profile (e.g., a Tx profile indicating that the service supports sidelink DRX operation or a Tx profile indicating that the service does not need to support sidelink DRX operation) whether to apply some of the proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure.

[0385] For example, depending on whether PUCCH configuration is supported (e.g., in the case where PUCCH resources are configured or where PUCCH resources are not configured), it can be specifically (or differently or independently) configured whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each resource pool (e.g., a resource pool with PSFCH or a resource pool without PSFCH) whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each sidelink logical channel / logical channel group (or Uu logical channel or Uu logical channel group) whether to apply the proposed rules and / or related parameter configuration values of the present disclosure.

[0386] For example, it can be configured (differently or independently) for each resource pool whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each service / group type whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each service / group priority whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each QoS requirement (e.g., URLLC / EMBB service, reliability, latency) whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each PQI whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each PFI whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each playback type (e.g., unicast, multicast, broadcast) whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each (resource pool) congestion level (e.g., CBR) whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each SL HARQ feedback option (e.g., NACK-only feedback, ACK / NACK feedback) whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured specifically (or differently or independently) for MAC PDU transmission with HARQ feedback enabled whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured specifically (or differently or independently) for MAC PDU transmission with HARQ feedback disabled whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured specifically (or differently or independently) according to whether the PUCCH-based SL HARQ feedback reporting operation is configured whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured specifically (or differently or independently) for preemption or depending on whether preemption-based resource reselection is performed whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured specifically (or differently or independently) for re-evaluation or depending on whether re-evaluation-based resource reselection is performed whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each (L2 or L1) (source and / or destination) identifier whether to apply the proposed rules and / or related parameter configuration values of the present disclosure. For example, it can be configured (differently or independently) for each (L2 or L1) (combination of source ID and destination ID) identifier whether to apply the proposed rules and / or related parameter configuration values of the present disclosure.For example, whether to apply the proposed rules of the present disclosure and / or related parameter configuration values can be configured (differently or independently) for each (L2 or L1) (combination of source ID and destination ID and play type) identifier. For example, whether to apply the proposed rules of the present disclosure and / or related parameter configuration values can be configured (differently or independently) for each direction of the pair of source layer ID and target layer ID. For example, whether to apply the proposed rules of the present disclosure and / or related parameter configuration values can be configured (differently or independently) for each PC5 RRC connection / link. For example, whether to apply the proposed rules of the present disclosure and / or related parameter configuration values can be configured specifically (or differently or independently) depending on whether SL DRX is performed. For example, whether to apply the proposed rules of the present disclosure and / or related parameter configuration values can be configured specifically (or differently or independently) depending on whether SL DRX is supported. For example, whether to apply the proposed rules of the present disclosure and / or related parameter configuration values can be configured specifically (or differently or independently) for each SL mode type (e.g., resource allocation mode 1 or resource allocation mode 2). For example, whether to apply the proposed rules of the present disclosure and / or related parameter configuration values can be configured specifically (or differently or independently) for the case of performing (non)-periodic resource reservation. For example, whether to apply the proposed rules of the present disclosure and / or related parameter configuration values can be configured specifically (or differently or independently) for each Tx profile (e.g., a Tx profile indicating that the service supports side-link DRX operation or a Tx profile indicating that the service does not need to support side-link DRX operation).

[0387] The proposal and whether to apply the proposed rules (and / or related parameter configuration values) of the present disclosure can also be applied to millimeter wave (mmWave) SL operations.

[0388] Figure 18 A method for wireless communication performed by a first device according to an embodiment of the present disclosure is shown. Figure 18 Embodiments of can be combined with various embodiments of the present disclosure.

[0389] Refer to Figure 18, in step S1810, the first device may obtain information related to multiple Physical Sidelink Feedback Channel (PSFCH) occasions. In step S1820, the first device may obtain sidelink (SL) discontinuous reception (DRX) configuration information including information related to the SL DRX Hybrid Automatic Repeat reQuest (HARQ) Round-Trip Time (RTT) timer. In step S1830, the first device may receive a first Sidelink Control Information (SCI) for scheduling a second SCI and a Physical Sidelink Shared Channel (PSSCH) on a Physical Sidelink Control Channel (PSCCH). In step S1840, the first device may receive a second SCI and data on the PSSCH. For example, the PSSCH may be related to multiple PSFCH occasions. For example, based on the inability to send SL HARQ feedback in multiple PSFCH occasions, the SL DRX HARQ RTT timer is started after the last PSFCH occasion among the multiple PSFCH occasions.

[0390] For example, the failure to send SL HARQ feedback in multiple PSFCH occasions may be that no SL HARQ feedback is sent in all of the multiple PSFCH occasions.

[0391] For example, based on the failure to send SL HARQ feedback in multiple PSFCH occasions, the SL DRX HARQ RTT timer may be started in the first time slot after the last PSFCH occasion among the multiple PSFCH occasions.

[0392] For example, the failure to send SL HARQ feedback may be due to Listen Before Talk (LBT) failure.

[0393] For example, the first device may obtain an SL DRX retransmission timer. For example, the SL DRX retransmission timer may be started after the SL DRX HARQ RTT timer expires.

[0394] For example, based on the successful sending of SL HARQ feedback in one PSFCH occasion among multiple PSFCH occasions, the SL DRX HARQ RTT timer may be started after one PSFCH occasion among the multiple PSFCH occasions.

[0395] For example, based on the successful sending of SL HARQ feedback in one PSFCH occasion among multiple PSFCH occasions, the SL DRX HARQ RTT timer may be started after the end of one PSFCH occasion among the multiple PSFCH occasions.

[0396] For example, based on successful transmission of SL HARQ feedback in one of multiple PSFCH occasions, the SLDRX HARQ RTT timer may be started in the first time slot after the end of one of the multiple PSFCH occasions among the multiple PSFCH occasions.

[0397] For example, multiple PSFCH occasions may be transmitted via the first SCI or the second SCI.

[0398] For example, HARQ feedback may be enabled via the first SCI or the second SCI.

[0399] For example, the broadcast type associated with the first SCI or the second SCI may be unicast.

[0400] For example, based on non - transmission of SL HARQ feedback in multiple PSFCH occasions, the SL DRX HARQ RTT timer may be started after the end of the last PSFCH occasion among the multiple PSFCH occasions.

[0401] For example, the first SCI, the second SCI, and data may be received from a second device. For example, based on the inability to transmit SL HARQ feedback in multiple PSFCH occasions, the SL DRX HARQ RTT timer of the second device is started after the last PSFCH occasion among the multiple PSFCH occasions.

[0402] The proposed method may be applied to a device according to various embodiments of the present disclosure. First, the processor 102 of the first device 100 may obtain information related to multiple physical sidelink feedback channel (PSFCH) occasions. Additionally, the processor 102 of the first device 100 may obtain sidelink (SL) discontinuous reception (DRX) configuration information, which includes information related to the SLDRX hybrid automatic repeat request (HARQ) round - trip time (RTT) timer. Additionally, the processor 102 of the first device 100 may control the transceiver 106 to receive a first SCI for scheduling a second sidelink control information (SCI) and a physical sidelink shared channel (PSSCH) on a physical sidelink control channel (PSCCH). Furthermore, the processor 102 of the first device 100 may control the transceiver 106 to receive a second SCI and data on the PSSCH. For example, the PSSCH may be related to multiple PSFCH occasions. For example, based on the inability to transmit SL HARQ feedback in multiple PSFCH occasions, the SL DRX HARQ RTT timer is started after the last PSFCH occasion among the multiple PSFCH occasions.

[0403] According to an embodiment of the present disclosure, a first device configured to perform wireless communication can be provided. For example, the first device can include: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, cause the first device to perform operations, the operations including: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) opportunities; obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; receiving, on a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) for scheduling a second SCI and a physical sidelink shared channel (PSSCH); and receiving, on the PSSCH, the second SCI and data. For example, the PSSCH can be related to a plurality of PSFCH opportunities. For example, based on the inability to send SL HARQ feedback in a plurality of PSFCH opportunities, an SL DRX HARQ RTT timer is started after the last PSFCH opportunity among the plurality of PSFCH opportunities.

[0404] According to an embodiment of the present disclosure, a processing device configured to control a first device can be provided. The processing device can include: at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, cause the first device to perform operations, the operations including: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) opportunities; obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; receiving, on a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) for scheduling a second SCI and a physical sidelink shared channel (PSSCH); and receiving, on the PSSCH, the second SCI and data. For example, the PSSCH can be related to a plurality of PSFCH opportunities. For example, based on the inability to send SL HARQ feedback in a plurality of PSFCH opportunities, an SL DRX HARQ RTT timer is started after the last PSFCH opportunity among the plurality of PSFCH opportunities.

[0405] According to an embodiment of the present disclosure, a non - transitory computer - readable storage medium storing instructions can be provided. The instructions, when executed, cause a first device to perform operations, the operations including: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) opportunities; obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round - trip time (RTT) timer; receiving, on a physical sidelink control channel (PSCCH), a first SCI for scheduling a second sidelink control information (SCI) and a physical sidelink shared channel (PSSCH); and receiving, on the PSSCH, the second SCI and data. For example, the PSSCH can be related to a plurality of PSFCH opportunities. For example, based on the inability to send SL HARQ feedback in a plurality of PSFCH opportunities, the SL DRX HARQ RTT timer is started after the last PSFCH opportunity among the plurality of PSFCH opportunities.

[0406] Figure 19 A method for a second device to perform wireless communication based on an embodiment of the present disclosure is shown. Figure 19 Embodiments of can be combined with various embodiments of the present disclosure.

[0407] Referring to Figure 19 , in step S1910, the second device can obtain information related to a plurality of physical sidelink feedback channel (PSFCH) opportunities. In step S1920, the second device can obtain sidelink (SL) discontinuous reception (DRX) configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round - trip time (RTT) timer. In step S1930, the second device can send, on a physical sidelink control channel (PSCCH), a first SCI for scheduling a second sidelink control information (SCI) and a physical sidelink shared channel (PSSCH). In step S1940, the second device can send, on the PSSCH, the second SCI and data. For example, the PSSCH can be related to a plurality of PSFCH opportunities. For example, based on the inability to send SL HARQ feedback in a plurality of PSFCH opportunities, the SL DRX HARQ RTT timer is started after the last PSFCH opportunity among the plurality of PSFCH opportunities.

[0408] The proposed method can be applied to apparatuses according to various embodiments of the present disclosure. First, the processor 202 of the second apparatus 200 may obtain information related to a plurality of Physical Sidelink Feedback Channel (PSFCH) occasions. Additionally, the processor 202 of the second apparatus 200 may obtain sidelink (SL) discontinuous reception (DRX) configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer. Additionally, the processor 202 of the second apparatus 200 may control the transceiver 206 to transmit a first Sidelink Control Information (SCI) for scheduling a second SCI and a Physical Sidelink Shared Channel (PSSCH) on a Physical Sidelink Control Channel (PSCCH). Further, the processor 202 of the second apparatus 200 may control the transceiver 206 to transmit a second SCI and data on the PSSCH. For example, the PSSCH may be related to a plurality of PSFCH occasions. For example, based on the inability to transmit SL HARQ feedback in a plurality of PSFCH occasions, an SL DRX HARQ RTT timer is started after the last PSFCH occasion among the plurality of PSFCH occasions.

[0409] According to an embodiment of the present disclosure, a second apparatus configured to perform wireless communication may be provided. For example, the second apparatus may include: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, cause the second apparatus to perform operations including: obtaining information related to a plurality of Physical Sidelink Feedback Channel (PSFCH) occasions; obtaining sidelink (SL) discontinuous reception (DRX) configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; transmitting a first Sidelink Control Information (SCI) for scheduling a second SCI and a Physical Sidelink Shared Channel (PSSCH) on a Physical Sidelink Control Channel (PSCCH); and transmitting a second SCI and data on the PSSCH. For example, the PSSCH may be related to a plurality of PSFCH occasions. For example, based on the inability to transmit SL HARQ feedback in a plurality of PSFCH occasions, an SL DRX HARQ RTT timer is started after the last PSFCH occasion among the plurality of PSFCH occasions.

[0410] According to an embodiment of the present disclosure, a processing device configured to control a second device may be 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. For example, the instructions, when executed by the at least one processor, cause the second device to perform operations, the operations including: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; transmitting, on a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) for scheduling a second SCI and a physical sidelink shared channel (PSSCH); and transmitting, on the PSSCH, the second SCI and data. For example, the PSSCH may be related to a plurality of PSFCH occasions. For example, based on the inability to transmit SL HARQ feedback in a plurality of PSFCH occasions, an SL DRX HARQ RTT timer is started after the last PSFCH occasion among the plurality of PSFCH occasions.

[0411] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions, when executed, cause the second device to perform operations, the operations including: obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; transmitting, on a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) for scheduling a second SCI and a physical sidelink shared channel (PSSCH); and transmitting, on the PSSCH, the second SCI and data. For example, the PSSCH may be related to a plurality of PSFCH occasions. For example, based on the inability to transmit SL HARQ feedback in a plurality of PSFCH occasions, an SL DRX HARQ RTT timer is started after the last PSFCH occasion among the plurality of PSFCH occasions.

[0412] Various embodiments of the present disclosure may be combined with each other.

[0413] Hereinafter, apparatuses to which various embodiments of the present disclosure may be applied will be described.

[0414] Various descriptions, functions, processes, proposals, methods, and / or operation flows of the present disclosure described herein may be applied to, but are not limited to, various fields that require wireless communication / connection (e.g., 5G) between devices.

[0415] In the following, a description will be given in more detail with reference to the accompanying drawings. In the following drawings / description, unless otherwise described, the same reference numerals may represent the same or corresponding hardware blocks, software blocks, or functional blocks.

[0416] Figure 20 A communication system 1 according to an embodiment of the present disclosure is shown. Figure 20 Embodiments of can be combined with various embodiments of the present disclosure.

[0417] Referring to Figure 20 , the communication system 1 to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Here, the 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, without limitation, a robot 100a, vehicles (100b-1, 100b-2), an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicle may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Here, the vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) mounted in a vehicle, a TV, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The handheld device may include a smart phone, a smart board, a wearable device (e.g., a smart watch or smart glasses), and a computer (e.g., a notebook). The home appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include a sensor and a smart meter. For example, the BS and the network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node with respect to other wireless devices.

[0418] Here, in addition to LTE, NR, and 6G, the wireless communication technologies implemented in the wireless devices 100a to 100f of the present disclosure may also include narrowband Internet of Things for low-power communication. In this case, for example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above names. Additionally or alternatively, the wireless communication technologies implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on the LTE-M technology. In this case, as an example, the LTE-M technology may be an example of LPWAN and may be referred to by various names including enhanced machine type communication (eMTC), etc. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth-limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication, and / or 7) LTE M, and is not limited to the above names. Additionally or alternatively, the wireless communication technologies implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, low-power wide area network (LPWAN), and ZigBee considering low-power communication, and is not limited to the above names. As an example, the ZigBee technology may generate a personal area network (PAN) related to small / low-power digital communication based on various standards including IEEE 802.15.4, etc., and may be referred to by various names.

[0419] The wireless devices 100a to 100f may be connected to the network 300 via the BS200. 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 BS200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without going through the BS / network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0420] 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 via 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 and backhaul (IAB)). The wireless devices and the BS / wireless devices can send / receive radio signals to / from each other via wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b can send / receive signals via various physical channels. To this end, at least a part of the various configuration information configuration processes, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for sending / receiving radio signals can be performed based on various proposals of the present disclosure.

[0421] Figure 21 A wireless device according to an embodiment of the present disclosure is shown. Figure 21 Embodiments of can be combined with various embodiments of the present disclosure.

[0422] Referring to Figure 21 , the first wireless device 100 and the second wireless device 200 can send radio signals via various RATs (e.g., LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} can correspond to Figure 20 {wireless device 100x and BS200} and / or {wireless device 100x and wireless device 100x} in

[0423] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and / or one or more antennas 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then transmit radio signals including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive radio signals including second information / signals through the transceivers 106, and then store the information obtained by processing the second information / signals in the (one or more) memories 104. The (one or more) memories 104 may be connected to the (one or more) processors 102, and may store various information related to the operation of the (one or more) processors 102. For example, the (one or more) memories 104 may store software codes including commands for executing part or all of the processing controlled by the (one or more) processors 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operation flows disclosed in this document. Here, the (one or more) processors 102 and the (one or more) memories 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The (one or more) transceivers 106 may be connected to the (one or more) processors 102, and transmit and / or receive radio signals through the (one or more) antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The (one or more) transceivers 106 may be used interchangeably with the (one or more) radio frequency (RF) units. In the present disclosure, the wireless device may represent a communication modem / circuit / chip.

[0424] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process information in the (one or more) memories 204 to generate third information / signals, and then send radio signals including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive radio signals including fourth information / signals through the (one or more) transceivers 106, and then store the information obtained by processing the fourth information / signals in the (one or more) memories 204. The (one or more) memories 204 may be connected to the (one or more) processors 202, and may store various information related to the operation of the (one or more) processors 202. For example, the (one or more) memories 204 may store software codes including part or all of the processes controlled by the (one or more) processors 202 or commands for implementing the descriptions, functions, processes, proposals, methods, and / or operation flows disclosed in this document. Here, the (one or more) processors 202 and the (one or more) memories 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The (one or more) transceivers 206 may be connected to the (one or more) processors 202, and send and / or receive radio signals through the (one or more) antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The (one or more) transceivers 206 may be used interchangeably with the (one or more) RF units. In this disclosure, the wireless device may represent a communication modem / circuit / chip.

[0425] Next, the hardware components of wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by one or more processors 102 and 202, but are not limited to. 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, procedures, proposals, methods, and / or operation flows disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (e.g., baseband signals) from one or more transceivers 106 and 206, and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document.

[0426] One or more processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processor devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, procedures, or functions. The firmware or software configured to execute the descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, and thus be driven by one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0427] One or more memories 104 and 204 may be connected to one or more processors 102 and 202, and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memories 104 and 204 may be constituted by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, register, cache memory, computer-readable storage medium, and / or combinations thereof. One or more memories 104 and 204 may be located inside and / or outside one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 through various techniques such as wired or wireless connections.

[0428] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the methods and / or procedures of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, procedures, proposals, methods, and / or procedures disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may send and receive radio signals. For example, one or more processors 102 and 202 may execute control such that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may execute control such that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, procedures, proposals, methods, and / or procedures disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert 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 transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0429] Figure 22 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown. Figure 22 Embodiments of may be combined with various embodiments of the present disclosure.

[0430] Referring to Figure 22 , the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Operations / functions of may be performed, without being limited to Figure 22 of Figure 21The processor (102, 202) and / or transceiver (106, 206). It can be implemented by Figure 21 The processor (102, 202) and / or transceiver (106, 206) to implement Figure 22 The hardware elements. For example, it can be implemented by Figure 21 The processor (102, 202) to implement blocks 1010 to 1060. Alternatively, it can be implemented by Figure 21 The processor (102, 202) to implement blocks 1010 to 1050, and it can be implemented by Figure 21 The transceiver (106, 206) to implement block 1060.

[0431] It can be via Figure 22 The signal processing circuit 1000 to convert the codeword into a radio signal. Herein, the codeword is a coded bit sequence of an information block. The information block can include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal can be sent through various physical channels (e.g., PUSCH and PDSCH).

[0432] Specifically, the codeword can be converted by the scrambler 1010 into a scrambled bit sequence. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated by the modulator 1020 into a sequence of modulation symbols. The modulation scheme can include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex sequence of modulation symbols can be mapped by the layer mapper 1030 to one or more transmission layers. The modulation symbols of each transmission layer can be mapped (precoded) by the precoder 1040 to the corresponding antenna port(s). The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 by the N*M precoding matrix W. Here, N is the number of antenna ports, and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) on the complex modulation symbols. Alternatively, the precoder 1040 can perform precoding without performing transform precoding.

[0433] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include a plurality of symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and a plurality of subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be transmitted to other devices through each antenna. To this end, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an upconverter.

[0434] It is possible to configure the signal processing process for the signal received in the wireless device in a manner opposite to the Figure 22 signal processing processes (1010 to 1060). For example, a wireless device (e.g., Figure 21 100, 200) may receive a radio signal from the outside through an antenna port / transceiver. The received radio signal may be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal may be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword may be restored to the original information block through decoding. Therefore, the signal processing circuit (not illustrated) for the received signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0435] Figure 23 Another example of a wireless device according to an embodiment of the present disclosure is shown. The wireless device may be implemented in various forms according to use cases / services (refer to Figure 20 ). Figure 23 The embodiments of

[0436] Referring to Figure 23 , the wireless devices (100, 200) may correspond to the Figure 21 wireless devices (100, 200), and may be configured by various elements, components, units / parts, and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit 110, a control unit 120, a storage unit 130, and additional components 140. The communication unit may include a communication circuit 112 and one or more transceivers 114. For example, the communication circuit 112 may include Figure 21 one or more processors (102, 202) and / or one or more memories (104, 204) of Figure 21One or more transceivers (106, 206) and / or one or more antennas (108, 208). The control unit 120 is electrically connected to the communication unit 110, the storage unit 130, and the additional component 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical / mechanical operations of the wireless device based on programs / codes / commands / information stored in the storage unit 130. The control unit 120 may 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.

[0437] The additional component 140 can be variously configured according to 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 driving unit, and a computing unit. The wireless device may be implemented in, but not limited to, the following forms: a robot ( Figure 20 of 100a), a vehicle ( Figure 20 of 100b-1 and 100b-2), an XR device ( Figure 20 of 100c), a handheld device ( Figure 20 of 100d), a household appliance ( Figure 20 of 100e), an IoT device ( Figure 20 of 100f), a digital broadcast terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or financial device), a security device, a climate / environment device, an AI server / device ( Figure 20 of 400), a BS ( Figure 20 of 210), a network node, etc. According to the use case / service, the wireless device may be used in a mobile or fixed location.

[0438] In Figure 23In the wireless devices (100, 200), all kinds of components, assemblies, units / parts, and / or modules can be connected to each other through a wired interface, or at least some of them can be wirelessly connected through the communication unit 110. For example, in each of the wireless devices (100, 200), the control unit 120 and the communication unit 110 can be connected by a wired connection, and the control unit 120 and the first unit (e.g., 130, 140) can be wirelessly connected through the communication unit 110. Each component, assembly, unit / part, and / or module within the wireless devices (100, 200) can also include one or more elements. For example, the control unit 120 can be constructed by a set of one or more processors. As an example, the control unit 120 can be constructed by a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. As another example, the storage unit 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.

[0439] Hereinafter, examples of implementing Figure 23 will be described in detail with reference to the accompanying drawings.

[0440] Figure 24 A handheld device according to an embodiment of the present disclosure is shown. The handheld device can include a smart phone, a smart board, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device can be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT). Figure 24 Embodiments of

[0441] Referring to Figure 24 , the handheld device 100 can include an antenna unit (108), a communication unit 110, a control unit 120, a storage unit 130, a power supply unit 140a, an interface unit 140b, and an I / O unit 140c. The antenna unit 108 can be configured as part of the communication unit 110. Blocks 110 to 130 / 140a to 140c respectively correspond to Figure 23 blocks 110 to 130 / 140 of

[0442] The communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from other wireless devices or the BS. The control unit 120 can perform various operations by controlling the components of the handheld device 100. The control unit 120 can include an application processor (AP). The storage unit 130 can store data / parameters / programs / codes / commands required to drive the handheld device 100. The storage unit 130 can store input / output data / information. The power supply unit 140a can supply power to the handheld device 100 and includes a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support the connection of the handheld device 100 to other external devices. The interface unit 140b can include various ports for connecting to external devices (e.g., audio I / O ports and video I / O ports). The I / O unit 140c can input or output video information / signals, audio information / signals, data, and / or information input by the user. The I / O unit 140c can include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0443] For example, in the case of data communication, the I / O unit 140c can acquire information / signals input by the user (e.g., touch, text, voice, image, or video), and the acquired information / signals can be stored in the storage unit 130. The communication unit 110 can convert the information / signals stored in the memory into a radio signal and directly send the converted radio signal to other wireless devices or to the BS. The communication unit 110 can receive a radio signal from other wireless devices or the BS and then restore the received radio signal to the original information / signals. The restored information / signals can be stored in the storage unit 130 and can be output through the I / O unit 140 in various types (e.g., text, voice, image, video, or haptic).

[0444] Figure 25 A vehicle or an autonomous vehicle according to an embodiment of the present disclosure is shown. The vehicle or the autonomous vehicle can be implemented by a mobile robot, an automobile, a train, a manned / unmanned aerial vehicle (AV), a ship, etc. Figure 25 The embodiments of can be combined with various embodiments of the present disclosure.

[0445] Referring to Figure 25 , the vehicle or the autonomous vehicle 100 can include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 can be configured as a part of the communication unit 110. The blocks 110 / 130 / 140a to 140d respectively correspond to Figure 23 the blocks 110 / 130 / 140 of

[0446] The communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 can include an electronic control unit (ECU). The driving unit 140a can cause the vehicle or autonomous vehicle 100 to travel on the road. The driving unit 140a can include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and can include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can acquire vehicle state, external environment information, user information, etc. The sensor unit 140c can include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement technologies for keeping the lane in which the vehicle travels, for automatically adjusting the speed (e.g., adaptive cruise control), for autonomously driving along a determined path, for driving by automatically setting a path when a destination is set, etc.

[0447] For example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 can control the driving unit 140a so that the vehicle or autonomous vehicle 100 can move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 can acquire the latest traffic information data from an external server non-periodically / periodically and acquire surrounding traffic information data from adjacent vehicles. During autonomous driving, the sensor unit 140c can acquire vehicle state and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving path and the driving plan based on the newly acquired data / information. The communication unit 110 can transmit information about the vehicle position, the autonomous driving path, and / or the driving plan to an external server. The external server can use AI technology, etc. to predict traffic information data based on the information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0448] The claims in this specification can be combined in various ways. For example, the technical features in the method claims of this specification can be combined to be implemented or executed in a device, and the technical features in the device claims can be combined to be implemented or executed in a method. Additionally, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or executed in a device. Additionally, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or executed in a method.

Claims

1. A method performed by a first device in a wireless communication system, the method comprising the steps of: Obtaining information related to a plurality of Physical Sidelink Feedback Channel (PSFCH) occasions; Obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the SL DRX configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; Receiving, on a Physical Sidelink Control Channel (PSCCH), a first scheduling control information (SCI) for scheduling a second SCI and a Physical Sidelink Shared Channel (PSSCH); And Receiving the second SCI and data on the PSSCH, Wherein the PSSCH is related to the plurality of PSFCH occasions; and Wherein, based on no SL HARQ feedback being sent in the plurality of PSFCH occasions, the SL DRX HARQ RTT timer is started after a last PSFCH occasion among the plurality of PSFCH occasions.

2. The method according to claim 1, Among them, Not sending the SL HARQ feedback in the plurality of PSFCH occasions means not sending the SL HARQ feedback in all of the plurality of PSFCH occasions.

3. The method according to claim 1, Among them, Based on no SL HARQ feedback being sent in the plurality of PSFCH occasions, the SL DRX HARQ RTT timer is started in a first time slot after the last PSFCH occasion among the plurality of PSFCH occasions.

4. The method according to claim 1, Among them, The SL HARQ feedback is not sent based on a listen-before-talk (LBT) failure.

5. The method according to claim 1, the method further comprising the steps of: Obtaining an SL DRX retransmission timer, Wherein the SL DRX retransmission timer is started after the SL DRX HARQ RTT timer expires.

6. The method according to claim 1, Among them, Based on successful transmission of the SL HARQ feedback in one PSFCH occasion among the plurality of PSFCH occasions, the SL DRX HARQ RTT timer is started after the one PSFCH occasion among the plurality of PSFCH occasions.

7. The method according to claim 6, Among them, Based on successful transmission of the SL HARQ feedback in the one PSFCH occasion among the plurality of PSFCH occasions, the SL DRX HARQ RTT timer is started after the end of the one PSFCH occasion among the plurality of PSFCH occasions.

8. The method according to claim 7, Among them, Based on successfully transmitting the SL HARQ feedback in one of the plurality of PSFCH occasions, start the SL DRX HARQ RTT timer in the first time slot after the end of one of the plurality of PSFCH occasions among the plurality of PSFCH occasions.

9. The method according to claim 1, Among them, Transmit the plurality of PSFCH occasions by means of the first SCI or the second SCI.

10. The method according to claim 1, Among them, Enable HARQ feedback by means of the first SCI or the second SCI.

11. The method according to claim 1, Among them, The broadcast type associated with the first SCI or the second SCI is unicast.

12. The method according to claim 1, Among them, Based on not transmitting the SL HARQ feedback in the plurality of PSFCH occasions, start the SL DRX HARQ RTT timer after the end of the last PSFCH occasion among the plurality of PSFCH occasions.

13. The method according to claim 1, Among them, The first SCI, the second SCI and the data are received from a second device, and wherein, based on not transmitting the SL HARQ feedback in the plurality of PSFCH occasions, the SL DRX HARQ RTT timer of the second device is started after the last PSFCH occasion among the plurality of PSFCH occasions.

14. A first device configured to perform wireless communication, the first device comprising: At least one transceiver; At least one processor; And At least one memory, the at least one memory being connected to the at least one processor and storing instructions, the instructions, when executed by the at least one processor, cause the first device to perform operations, the operations including: Obtain information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; Obtain sidelink (SL) discontinuous reception (DRX) configuration information, the SL DRX configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; Receive, on a physical sidelink control channel (PSCCH), a first SCI for scheduling a second sidelink control information (SCI) and a physical sidelink shared channel (PSSCH); and Receive the second SCI and data on the PSSCH, wherein the PSSCH is related to the plurality of PSFCH occasions; and wherein, based on not transmitting SL HARQ feedback in the plurality of PSFCH occasions, start the SL DRX HARQ RTT timer after the last PSFCH occasion among the plurality of PSFCH occasions.

15. A processing device configured to control a first device, the processing device comprising: At least one processor; And At least one memory coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first device to perform operations, the operations including: Obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; Obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the SL DRX configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; Receiving, on a physical sidelink control channel (PSCCH), a first scheduling control information (SCI) for scheduling a second SCI and a physical sidelink shared channel (PSSCH); and Receiving the second SCI and data on the PSSCH, wherein the PSSCH is related to the plurality of PSFCH occasions; and wherein, based on no SL HARQ feedback being sent in the plurality of PSFCH occasions, the SL DRX HARQ RTT timer is started after a last PSFCH occasion among the plurality of PSFCH occasions.

16. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a first device to perform operations, the operations including: Obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; Obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the SL DRX configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; Receiving, on a physical sidelink control channel (PSCCH), a first scheduling control information (SCI) for scheduling a second SCI and a physical sidelink shared channel (PSSCH); and Receiving the second SCI and data on the PSSCH, wherein the PSSCH is related to the plurality of PSFCH occasions; and wherein, based on no SL HARQ feedback being sent in the plurality of PSFCH occasions, the SL DRX HARQ RTT timer is started after a last PSFCH occasion among the plurality of PSFCH occasions.

17. A method performed by a second device in a wireless communication system, the method comprising the steps of: Obtaining information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; Obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the SL DRX configuration information including information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; Transmitting, on a physical sidelink control channel (PSCCH), a first scheduling control information (SCI) for scheduling a second sidelink control information (SCI) and a physical sidelink shared channel (PSSCH); and Transmitting the second SCI and data on the PSSCH, wherein the PSSCH is related to the plurality of PSFCH occasions; and Wherein, based on not sending SL HARQ feedback in the multiple PSFCH occasions, the SL DRX HARQ RTT timer is started after the last PSFCH occasion among the multiple PSFCH occasions.

18. A second device configured to perform wireless communication, the second device comprising: At least one transceiver; At least one processor; And At least one memory, the at least one memory being connected to the at least one processor and storing instructions that, when executed by the at least one processor, cause the second device to perform operations, the operations including: Obtaining information related to multiple Physical Sidelink Feedback Channel (PSFCH) occasions; Obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the SL DRX configuration information including information related to an SL DRX Hybrid Automatic Repeat reQuest (HARQ) Round-Trip Time (RTT) timer; Transmitting a first Sidelink Control Information (SCI) for scheduling a second SCI and a Physical Sidelink Shared Channel (PSSCH) on a Physical Sidelink Control Channel (PSCCH); and Transmitting the second SCI and data on the PSSCH, Wherein the PSSCH is related to the multiple PSFCH occasions; and Wherein, based on not sending SL HARQ feedback in the multiple PSFCH occasions, the SL DRX HARQ RTT timer is started after the last PSFCH occasion among the multiple PSFCH occasions.

19. A processing device configured to control a second device, the processing device comprising: At least one processor; And At least one memory, the at least one memory being connected to the at least one processor and storing instructions that, when executed by the at least one processor, cause the second device to perform operations, the operations including: Obtaining information related to multiple Physical Sidelink Feedback Channel (PSFCH) occasions; Obtaining sidelink (SL) discontinuous reception (DRX) configuration information, the SL DRX configuration information including information related to an SL DRX Hybrid Automatic Repeat reQuest (HARQ) Round-Trip Time (RTT) timer; Transmitting a first Sidelink Control Information (SCI) for scheduling a second SCI and a Physical Sidelink Shared Channel (PSSCH) on a Physical Sidelink Control Channel (PSCCH); and Transmitting the second SCI and data on the PSSCH, Wherein the PSSCH is related to the multiple PSFCH occasions; and Wherein, based on not sending SL HARQ feedback in the multiple PSFCH occasions, the SL DRX HARQ RTT timer is started after the last PSFCH occasion among the multiple PSFCH occasions.

20. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a second device to perform operations, the operations including: Obtaining information related to multiple Physical Sidelink Feedback Channel (PSFCH) occasions; Obtain sidelink (SL) discontinuous reception (DRX) configuration information, where the SL DRX configuration information includes information related to an SL DRX hybrid automatic repeat request (HARQ) round-trip time (RTT) timer; Transmit a first sidelink control information (SCI) for scheduling a second SCI and a physical sidelink shared channel (PSSCH) on a physical sidelink control channel (PSCCH); and Transmit the second SCI and data on the PSSCH, where the PSSCH is related to the plurality of physical sidelink feedback channel (PSFCH) opportunities; and where, based on no SL HARQ feedback being transmitted in the plurality of PSFCH opportunities, an SL DRX HARQ RTT timer is started after a last PSFCH opportunity among the plurality of PSFCH opportunities.

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