Method and apparatus for supporting NR SL and LTE SL coexistence

Abstract

A method of operating a first device (100) in a wireless communication system is presented. The method may comprise the steps of: obtaining information on long term evolution (LTE) sidelink (SL) resources reserved by a second device (200); obtaining an SL Reference Signal Received Power (RSRP) value associated with the LTE SL resource; and selecting, based on the SL RSRP value exceeding a first threshold, a first new radio (NR) SL resource having an associated physical side link feedback channel (PSFCH) transmission occasion that does not overlap an associated PSFCH transmission occasion of the LTE SL resource in time domain.

Description

Technical Field

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

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

[0003] In addition, since a wider range of communication devices require greater communication capacity, the demand for enhanced mobile broadband communications compared to existing radio access technologies (RATs) is rising. Therefore, services and user equipment that are sensitive to reliability and latency have been discussed. In addition, next-generation radio access technologies based on enhanced mobile broadband communications, massive machine type communications (MTC), ultra-reliable low-latency communications (URLLC), etc. may be referred to as new radio access technologies (RATs) or new radios (NRs). Summary of the invention

[0004] Technical Solution

[0005] According to one embodiment of the present disclosure, a method for performing wireless communication by a first device may be proposed. For example, the method may include the following steps: obtaining information of a long term evolution (LTE) side link (SL) resource reserved by a second device; obtaining a SL reference signal received power (RSRP) value related to the LTE SL resource; and selecting a first new radio (NR) SL resource whose related physical side link feedback channel (PSFCH) transmission timing does not overlap with the LTE SL resource in the time domain based on the SL RSRP value exceeding a first threshold.

[0006] According to one embodiment of the present disclosure, a first device for performing wireless communication may be proposed. For example, the first device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations based on being executed by the at least one processor. For example, the operations may include: obtaining information about a long term evolution (LTE) side link (SL) resource reserved by a second device; obtaining a SL reference signal received power (RSRP) value associated with the LTE SL resource; and selecting a first new radio (NR) SL resource whose associated physical side link feedback channel (PSFCH) transmission timing does not overlap with the LTE SL resource in the time domain based on the SL RSRP value exceeding a first threshold.

[0007] According to one embodiment of the present disclosure, a device suitable for controlling a first user equipment (UE) may be proposed. For example, the device may include: at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions causing the first UE to perform operations based on being executed by the at least one processor. For example, the operations may include: obtaining information about long term evolution (LTE) side link (SL) resources reserved by a second device; obtaining a SL reference signal received power (RSRP) value associated with the LTE SL resources; based on the SL RSRP value exceeding a first threshold, selecting a first new radio (NR) SL resource whose associated physical side link feedback channel (PSFCH) transmission timing does not overlap with the LTE SL resource in the time domain.

[0008] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, based on the execution of the instructions, a first device may: obtain information of a long-term evolution (LTE) side link (SL) resource reserved by a second device; obtain a SL reference signal received power (RSRP) value related to the LTE SL resource; and select a first new radio (NR) SL resource whose related physical side link feedback channel (PSFCH) transmission timing does not overlap with the LTE SL resource in the time domain based on the SL RSRP value exceeding a first threshold.

[0009] According to one embodiment of the present disclosure, a method for performing wireless communication by a second device may be proposed. For example, the method may include the following steps: receiving sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) from a first device via a physical sidelink control channel (PSCCH) based on a first new radio (NR) SL resource; receiving a medium access control (MAC) protocol data unit (PDU) from a first device via a PSSCH based on the first NR SL resource, wherein a physical sidelink feedback channel (PSFCH) transmission timing associated with the first NR SL resource does not overlap with a long-term evolution (LTE) SL resource in the time domain, and wherein the first NR SL resource may be selected based on an SL reference signal received power (RSRP) value associated with the LTE SL resource exceeding a first threshold.

[0010] According to one embodiment of the present disclosure, a second device for performing wireless communication may be proposed. For example, the second device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions causing the second device to perform operations based on being executed by the at least one processor. For example, the operations may include: receiving sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) from a first device via a physical sidelink control channel (PSCCH) based on a first new radio (NR) SL resource; receiving a medium access control (MAC) protocol data unit (PDU) from a first device via the PSSCH based on the first NR SL resource, wherein a physical sidelink feedback channel (PSFCH) transmission timing associated with the first NR SL resource does not overlap with a long term evolution (LTE) SL resource in the time domain, and the first NR SL resource may be selected based on a SL reference signal received power (RSRP) value associated with the LTE SL resource exceeding a first threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A communication structure that may be provided in a 6G system according to an embodiment of the present disclosure is shown.

[0012] Figure 2 The electromagnetic spectrum is shown according to one embodiment of the present disclosure.

[0013] Figure 3 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0014] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0015] Figure 5 The structure of a radio frame of NR according to an embodiment of the present disclosure is shown.

[0016] Figure 6 The time slot structure of the NR frame according to an embodiment of the present disclosure is shown.

[0017] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown.

[0018] Figure 8 A process in which a UE according to an embodiment of the present disclosure performs V2X or SL communication according to a transmission mode is shown.

[0019] Fig. 9 Three broadcast types according to embodiments of the present disclosure are shown.

[0020] Fig.10 A method for a UE that has reserved transmission resources to notify another UE of the transmission resources according to an embodiment of the present disclosure is shown.

[0021] Fig.11 NR SL resources overlapping with LTE SL resources and related NR SL transmission power according to one embodiment of the present disclosure are shown.

[0022] Fig.12 NR PSFCH resources overlapping with LTE SL resources according to one embodiment of the present disclosure are shown.

[0023] Fig.13 A process in which a first device performs wireless communication according to an embodiment of the present disclosure is shown.

[0024] Fig.14 A process of a second device performing wireless communication according to an embodiment of the present disclosure is shown.

[0025] Fig.15 A communication system 1 according to an embodiment of the present disclosure is shown.

[0026] Fig.16 A wireless device according to an embodiment of the present disclosure is shown.

[0027] Fig.17 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0028] Fig.18 Another example of a wireless device according to an embodiment of the present disclosure is shown.

[0029] Fig.19 A handheld device according to an embodiment of the present disclosure is shown.

[0030] Fig. 20 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

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

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

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

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

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

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

[0037] The technical features respectively described in a pair of drawings in the present disclosure may be implemented separately or simultaneously.

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

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

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

[0041] The 6G (wireless communication) system aims at (i) very high data rate per device, (ii) very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) lower energy consumption for battery-free IoT devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be embodied in four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and the 6G system can meet the requirements shown in Table 1 below. In other words, Table 1 is an example of the requirements of the 6G system.

[0042] [Table 1]

[0043] Peak data rate per device 1Tbps E2E Latency 1ms Maximum spectral efficiency 100bps / Hz Mobility support Up to 1000km / hr Satellite Integration completely AI completely Autonomous Vehicles completely XR completely Tactile communication completely

[0044] The 6G system can have key factors such as eMBB (enhanced mobile broadband), URLLC (ultra-reliable low-latency communication), mMTC (massive machine type communication), AI integrated communication, tactile Internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0045] Figure 1 A communication structure that may be provided in a 6G system according to an embodiment of the present disclosure is shown. Figure 1 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0046] 6G systems are expected to have 50 times higher simultaneous radio connectivity than 5G radio systems. URLLC (a key feature of 5G) will become a more dominant technology in 6G communications by providing end-to-end latency of less than 1ms. In 6G systems, volume spectral efficiency will be better as opposed to area spectral efficiency that is often used today. 6G systems will be able to provide very long battery life and advanced battery technology for energy harvesting, so in 6G systems, mobile devices will not need to be charged separately. In 6G, new network features may be as follows.

[0047] -Satellite integrated network: In order to provide global mobile groups, 6G is expected to be integrated with satellites. Integrating terrestrial, satellite, and airborne networks into a single wireless communication system is important for 6G.

[0048] -Connected Intelligence: Unlike previous generations of wireless communication systems, 6G is revolutionary, and wireless evolution will be updated from "connecting things" to "connected intelligence." AI can be applied to every step of the communication process (or every step of signal processing, as will be described later).

[0049] - Seamless integration of wireless information and energy transfer: 6G wireless networks will deliver power to charge the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transfer (WIET) will be integrated.

[0050] -Ubiquitous Super 3D Connectivity: Super 3D connectivity will be generated from 6G ubiquitous to access networks and core network functions on drones and very low Earth orbit satellites.

[0051] Given the above new network characteristics of 6G, some common requirements can be as follows

[0052] - Small cell network: The idea of ​​small cell network is introduced in cellular systems to improve the received signal quality due to improved processing throughput, energy efficiency and spectrum efficiency. Therefore, small cell network is an essential feature of communication systems through 5G and beyond 5G (5GB). Therefore, 6G communication systems will also adopt the characteristics of small cell network.

[0053] -Ultra-dense heterogeneous network: Ultra-dense heterogeneous network will be another important feature of 6G communication system. Multi-layer network composed of heterogeneous networks will improve the overall QoS and reduce costs.

[0054] - High Capacity Backhaul: Backhaul connections are characterized by high capacity backhaul networks to support large volumes of traffic. High-speed optical fibers and free space optics (FSO) systems can be possible solutions to this problem.

[0055] - Radar technology integrated with mobile technology: High-precision positioning (or location-based services) through communication is one of the characteristics of 6G wireless communication systems. Therefore, radar systems will be integrated with 6G networks.

[0056] -Software and virtualization: Software and virtualization are two important features essential to the design process in 5Gb networks to ensure flexibility, reconfigurability and programmability. In addition, billions of devices can be shared on a shared physical infrastructure.

[0057] The following describes the core implementation technologies for 6G systems.

[0058] -Artificial Intelligence: The most important and latest technology that will be introduced in 6G systems is AI. 4G systems do not involve AI. 5G systems will support partial or very limited AI. However, 6G systems will be fully AI-enabled for automation. In 6G, advances in machine learning will create more intelligent networks for real-time communications. The introduction of AI in telecommunications can simplify and improve real-time data transmission. AI can use many analyses to determine the way to perform complex target operations, which means that AI can improve efficiency and reduce processing delays. Time-consuming tasks such as switching, network selection, and resource scheduling can be completed instantly by using AI. AI can also play an important role in M2M, machine-to-man, and man-to-machine communications. In addition, AI can become a fast communication in brain-computer interfaces (BCI). AI-based communication systems can be supported by metamaterials, smart structures, smart networks, smart devices, smart cognitive radios, self-sustaining wireless networks, and machine learning.

[0059] -THz communication (THz communication): The data rate can be increased by increasing the bandwidth. This can be achieved by using sub-THz communication with wide bandwidth and applying advanced massive MIMO technology. THz waves (also called sub-millimeter radiation) refer to the frequency band between 0.1THz and 10THz, where the corresponding wavelength is generally in the range of 0.03mm to 3mm. The 100GHz-300 GHz band range (sub-THz band) is considered to be the main part of the THz band for cellular communication. Adding the sub-THz band to the millimeter wave band increases the capacity of 6G cellular communication. 300GHz-3 THz in the defined THz band is in the far infrared (IR) band. The 300GHz-3 THz band is part of the optical band, but it is on the boundary of the optical band, just behind the RF band. Therefore, the 300GHz-3 THz band exhibits similarities with RF. Figure 2 The electromagnetic spectrum is shown according to one embodiment of the present disclosure. Figure 2 The embodiments of can be combined with various embodiments of the present disclosure. Key characteristics of THz communication include (i) widely available bandwidth supporting very high data rates, and (ii) high path loss at high frequencies (for which highly directional antennas are indispensable). The narrow beamwidth produced by highly directional antennas reduces interference. The small wavelength of THz signals allows a larger number of antenna elements to be integrated into devices and BSs operating in this frequency band. This enables the use of advanced adaptive array techniques that can overcome range limitations.

[0060] - Massive MIMO

[0061] -HBF, Holographic Beamforming

[0062] -Optical wireless technology

[0063] -FSO backhaul network

[0064] - Non-terrestrial network, NTN

[0065] -Quantum communication

[0066] - No cell communication

[0067] -Integration of wireless information and power transmission

[0068] -Integration of wireless communication and sensing

[0069] -Integrated access and backhaul network

[0070] -Big Data Analysis

[0071] - Reconfigurable smart surfaces

[0072] -Metaverse

[0073] -Blockchain

[0074] -UAV, Unmanned Aerial Vehicle (UAV) or drone will be an important part of 6G wireless communications. In most cases, UAV technology is used to provide high-speed data wireless connections. The BS entity is installed on the UAV to provide cellular connectivity. UAV has specific features not found in fixed BS infrastructure (e.g., easy deployment, strong line-of-sight link, and freedom of controlled mobility). During emergencies such as natural disasters, the deployment of terrestrial communication infrastructure is economically unfeasible and sometimes cannot provide services in volatile environments. UAV can easily handle these situations. UAV will be a new paradigm in wireless communications. This technology contributes to the three basic requirements of wireless networks: eMBB, URLLC, and mMTC. UAV can also support many other purposes such as enhanced network connectivity, fire detection, disaster emergency services, security and surveillance, pollution monitoring, parking monitoring, accident monitoring, etc. Therefore, UAV technology is considered to be one of the most important technologies for 6G communications.

[0075] -Autonomous driving, automated driving: For perfect autonomous driving, vehicles must communicate with each other to notify each other of dangerous situations, or communicate with infrastructure such as parking lots and traffic lights to check information such as the location of parking information and signal change time. Vehicle-to-Everything (V2X), a key element in building autonomous driving infrastructure, is a technology that allows vehicles to communicate with various elements on the road and share information in order to perform autonomous driving (e.g., vehicle-to-vehicle (V2V) wireless communication and vehicle-to-infrastructure (V2I) wireless communication). In order to maximize the performance of autonomous driving and ensure high safety, fast transmission speeds and low-latency technologies are necessary. In addition, in the future, autonomous driving will go beyond delivering warning or guidance messages to the driver to actively intervene in vehicle operations and directly control the vehicle in dangerous situations, so the amount of information that needs to be sent and received will be large, and 6G is expected to maximize autonomous driving with faster transmission speeds and lower latency than 5G.

[0076] For the sake of clarity, the description focuses on 5G NR, but the technical concept of one embodiment of the present disclosure is not limited thereto. Various embodiments of the present disclosure may also be applicable to 6G communication systems.

[0077] Figure 3 The structure of the NR system based on the embodiment of the present disclosure is shown. Figure 3 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0078] Reference Figure 3, the next generation radio access network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol terminations to the UE 10. For example, the BS 20 may include a next generation Node B (gNB) and / or an evolved Node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to as other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. For example, the BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to as other terms such as a base transceiver system (BTS), an access point (AP), etc.

[0079] Figure 3 The embodiment of the present invention illustrates a case where only gNB is included. BS20 may be connected to each other via an Xn interface. BS20 may be connected to each other via a fifth generation (5G) core network (5GC) and an NG interface. More specifically, BS20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a user plane function (UPF) 30 via an NG-U interface.

[0080] The radio interface protocol layer between the UE and the network can be classified into the first layer (L1), the second layer (L2), and the third layer (L3) based on the lower three layers of the open system interconnection (OSI) model known in the communication system. Among them, the physical (PHY) layer belonging to the first layer provides an information transmission service using a physical channel, and the radio resource control (RRC) layer located at the third layer controls the radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0081] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 4 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4 (a) in FIG. 1 shows a radio protocol stack for a user plane of Uu communication, and Figure 4 (b) in FIG. 5 shows the radio protocol stack of the control plane for Uu communication. Figure 4 (c) in FIG. 1 shows a radio protocol stack of a user plane for SL communication, and Figure 4 (d) in FIG. 5 shows the radio protocol stack of the control plane for SL communication.

[0082] Reference Figure 4, the physical layer provides information transfer services to the upper layer through the physical channel. The physical layer is connected to the medium access control (MAC) layer, which is the upper layer of the physical layer, through the transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how the data is transmitted through the radio interface and what characteristics of the data it transmits.

[0083] Data is transmitted through a physical channel between different physical layers (ie, a PHY layer of a transmitter and a PHY layer of a receiver). The physical channel may be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

[0084] The MAC layer provides services to the Radio Link Control (RLC) layer via logical channels, and the RLC layer is a higher layer of the MAC layer. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transmission services through logical channels.

[0085] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). In order to ensure different Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three types of operation modes, namely, Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction through Automatic Repeat Request (ARQ).

[0086] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer is used to control logical channels, transport channels, and physical channels associated with the configuration, reconfiguration, and release of RBs. RBs are logical paths for data transmission between UEs and networks provided by the first layer (i.e., the physical layer or PHY layer) and the second layer (i.e., the MAC layer, the RLC layer, the packet data convergence protocol (PDCP) layer, and the service data adaptation protocol (SDAP) layer).

[0087] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include transmission, header compression and encryption of user data. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include transmission and encryption / integrity protection of control plane data.

[0088] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and QoS Flow ID (QFI) marking in both DL and UL packets.

[0089] Configuration of RB means a process for specifying radio protocol layers and channel attributes to provide a specific service and for determining corresponding detailed parameters and operation methods. RBs can then be classified into two types, namely, signaling radio bearers (SRBs) and data radio bearers (DRBs). SRBs are used as a path for sending RRC messages in the control plane, and DRBs are used as a path for sending user data in the user plane.

[0090] When the RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state, otherwise the UE can be in the RRC idle (RRC_IDLE) state. In the case of NR, the RRC inactive (RRC_INACTRIVE) state is additionally defined, and the UE in the RRC_INACTRIVE state can maintain the connection with the core network and release its connection with the BS.

[0091] The downlink transmission channels for sending (or transmitting) data from the network to the UE include a broadcast channel (BCH) for sending system information and a downlink shared channel (SCH) for sending other user services or control messages. The services or control messages of downlink multicast or broadcast services can be sent via the downlink SCH or can be sent via a separate downlink multicast channel (MCH). In addition, the uplink transmission channels for sending (or transmitting) data from the UE to the network include a random access channel (RACH) for sending initial control messages and an uplink shared channel (SCH) for sending other user services or control messages.

[0092] Examples of logical channels belonging to the higher layers of the transport channel and mapped to the transport channel may include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

[0093] Figure 5 The structure of a radio frame of NR according to an embodiment of the present disclosure is shown. Figure 5 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0094] Reference Figure 5 In NR, a radio frame can be used to perform uplink and downlink transmissions. The length of a radio frame is 10ms and can be defined as consisting of two half frames (HF). A half frame can include five 1ms subframes (SF). A subframe (SF) can be divided into one or more time slots, and the number of time slots within a subframe can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP).

[0095] When a normal CP is used, each time slot may include 14 symbols. When an extended CP is used, each time slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or a CP-OFDM symbol) and a single carrier-FDMA (SC-FDMA) symbol (or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol).

[0096] Table 2 below shows the number of symbols per slot (N) according to the SCS configuration (u) when using the normal CP or the extended CP. slot symb ), the number of time slots per frame (N frame,μ slot ) and the number of time slots per subframe (N subframe,μ slot ).

[0097] [Table 2]

[0098]

[0099] In the NR system, OFDM (A) parameter sets (e.g., SCS, CP length, etc.) between multiple cells integrated into one UE may be configured differently. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., a subframe, a time slot, or a TTI) (collectively referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently in the integrated cells.

[0100] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, with an SCS of 15kHz, a wide range of traditional cellular bands can be supported, and with an SCS of 30kHz / 60kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. With an SCS of 60kHz or higher, bandwidths greater than 24.25GHz can be used to overcome phase noise.

[0101] The NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values ​​of the frequency ranges may be changed (or varied), for example, the two different types of frequency ranges may be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 may mean "a range below 6 GHz", and FR2 may mean "a range above 6 GHz", and may also be referred to as millimeter wave (mmW).

[0102] [Table 3]

[0103] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0104] As described above, the value of the frequency range in the NR system may be changed (or varied). For example, as shown in Table 4 below, FR1 may include a bandwidth in the range of 410 MHz to 7125 MHz. More specifically, FR1 may include frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 may include unlicensed frequency bands. Unlicensed frequency bands may be used for various purposes, for example, unlicensed frequency bands are used for vehicle-specific communications (e.g., autonomous driving).

[0105] [Table 4]

[0106] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0107] Figure 6 The structure of the time slot of the NR frame based on the embodiment of the present disclosure is shown. Figure 6 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0108] Reference Figure 6 , a time slot includes multiple symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols. However, in the case of extended CP, one time slot may include 12 symbols. Alternatively, in the case of normal CP, one time slot may include 7 symbols. However, in the case of extended CP, one time slot may include 6 symbols. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as a plurality of consecutive subcarriers (e.g., 12 subcarriers) in the frequency domain. A bandwidth part (BWP) can be defined as a plurality of consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP may correspond to a parameter set (e.g., SCS, CP length, etc.).

[0109] A carrier may include a maximum of N BWPs (eg, 5 BWPs). Data communication may be performed via the activated BWPs. Each element may be referred to as a resource element (RE) in a resource grid, and one complex symbol may be mapped to each element.

[0110] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0111] A BWP may be a contiguous set of physical resource blocks (PRBs) within a given parameter set. A PRB may be selected from a contiguous set of common resource blocks (CRBs) for a given parameter set on a given carrier.

[0112] For example, the BWP may be at least any one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor the downlink radio link quality in a DL BWP other than an activated DL BWP on a primary cell (PCell). For example, the UE may not receive a PDCCH, a physical downlink shared channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) other than an activated DL BWP. For example, the UE may not trigger a channel state information (CSI) report for an unactivated DL BWP. For example, the UE may not send a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) other than an activated UL BWP. For example, in the case of a downlink, the initial BWP may be given as a set of contiguous RBs for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by a physical broadcast channel (PBCH)). For example, in the case of an uplink, the initial BWP may be given by a system information block (SIB) for a random access procedure. For example, a default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be the initial DLBWP.To save energy, if the UE cannot detect downlink control information (DCI) during a specified period, the UE may switch the UE's active BWP to the default BWP.

[0113] In addition, a BWP may be defined for SL. The same SLBWP may be used in transmission and reception. For example, a transmitting UE may send a SL channel or SL signal on a specific BWP, and a receiving UE may receive a SL channel or SL signal on a specific BWP. In a licensed carrier, the SL BWP may be defined separately from the Uu BWP, and the SLBWP may have configuration signaling separate from the Uu BWP. For example, the UE may receive a configuration for the SLBWP from the BS / network. For example, the UE may receive a configuration for the Uu BWP from the BS / network. SLBWP is (pre-)configured in the carrier for out-of-coverage NR V2X UEs and RRC_IDLE UEs. For a UE in RRC_CONNECTED mode, at least one SL BWP may be activated in the carrier.

[0114] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown. Figure 7 The embodiments of can be combined with various embodiments of the present disclosure. Figure 7 In an implementation manner, the number of BWPs is 3.

[0115] Reference Figure 7, a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier frequency band to the other end thereof. Additionally, a PRB may be a resource block numbered within each BWP. Point A may indicate a common reference point of a resource block grid.

[0116] It can be obtained by point A, the offset relative to point A (N start BWP ) and bandwidth (N size BWP ) to configure the BWP. For example, point A can be an external reference point of the PRBs of the carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) are aligned in point A. For example, the offset can be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth can be the number of PRBs within a given parameter set.

[0117] Hereinafter, V2X or SL communication will be described.

[0118] The side link synchronization signal (SLSS) may include a primary side link synchronization signal (PSSS) and a secondary side link synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a side link primary synchronization signal (S-PSS), and the SSSS may be referred to as a side link secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

[0119] The physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for sending default (system) information, which the UE must first know before SL signal transmission / reception. For example, the default information can be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to resource pools, types of applications related to SLSS, subframe offsets, broadcast information, etc. For example, in order to evaluate PSBCH performance, in NRV2X, the payload size of PSBCH can be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0120] S-PSS, S-SSS, and PSBCH may be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sidelink synchronization signal block (S-SSB)). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in the carrier, and the transmission bandwidth may exist within a (pre-) configured sidelink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH may exist across 11 RBs. In addition, the frequency position of the S-SSB may be (pre-) configured. Therefore, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0121] Figure 8 A process of performing V2X or SL communication based on a transmission mode by a UE according to an embodiment of the present disclosure is shown. Figure 8 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for ease of explanation, in LTE, the transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

[0122] For example, Figure 8 (a) in FIG. 1 shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 8 (a) in FIG. 1 shows UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to conventional SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0123] For example, Figure 8 (b) in FIG. 4 shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 (b) in FIG. 1 shows UE operation related to NR resource allocation mode 2.

[0124] Reference Figure 8 (a), in LTE transmission mode 1, LTE transmission mode 3 or NR resource allocation mode 1, the base station may schedule SL resources to be used by the UE for SL transmission. For example, in step S600, the base station may send information related to the SL resources and / or information related to the UL resources to the first UE. For example, the UL resources may include PUCCH resources and / or PUSCH resources. For example, the UL resources may be resources for reporting SL HARQ feedback to the base station.

[0125] For example, the first UE may receive information related to dynamic grant (DG) resources and / or information related to configuration grant (CG) resources from the base station. For example, the CG resources may include CG type 1 resources or CG type 2 resources. In the present disclosure, the DG resources may be resources configured / allocated to the first UE by the base station through downlink control information (DCI). In the present disclosure, the CG resources may be (periodic) resources configured / allocated to the first UE by the base station through DCI and / or RRC messages. For example, in the case of CG type 1 resources, the base station may send an RRC message including information related to the CG resources to the first UE. For example, in the case of CG type 2 resources, the base station may send an RRC message including information related to the CG resources to the first UE, and the base station may send a DCI related to the activation or release of the CG resources to the first UE.

[0126] In step S810, the first UE may send a PSCCH (e.g., sidelink control information (SCI) or a first-level SCI) to a second UE based on resource scheduling. In step S820, the first UE may send a PSSCH (e.g., a second-level SCI, a MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S830, the first UE may receive a PSFCH related to the PSCCH / PSSCH from the second UE. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second UE via the PSFCH. In step S840, the first UE may send / report the HARQ feedback information to the base station via the PUCCH or PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on the HARQ feedback information received from the second UE. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on a preconfigured rule. For example, the DCI may be a DCI for SL scheduling. For example, the format of the DCI may be DCI format 3_0 or DCI format 3_1.

[0127] Reference Figure 8(b), in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the base station / network or the pre-configured SL resources. For example, the configured SL resources or the pre-configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources within the configured resource pool. For example, the UE can autonomously select resources within the selection window by performing a sensing process and a resource (re)selection process. For example, sensing can be performed in units of subchannels. For example, in step S810, the first UE that has selected resources from the resource pool by itself can send a PSCCH (e.g., sidelink control information (SCI) or a first-level SCI) to a second UE by using the resources. In step S820, the first UE can send a PSSCH (e.g., a second-level SCI, a MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S830, the first UE can receive a PSFCH related to the PSCCH / PSSCH from the second UE.

[0128] Hereinafter, a process in which the UE determines a resource subset to be reported to a higher layer during PSSCH resource selection in sidelink resource allocation mode 2 will be described.

[0129] In resource allocation mode 2, the upper layer can request the UE to determine a resource subset from which the upper layer will select resources for PSSCH / PSCCH transmission. To trigger this process, in time slot n, the upper layer provides the following parameters for the PSSCH / PSCCH transmission:

[0130] - the resource pool for which the resource is to be reported;

[0131] -L1 priority, prio TX ;

[0132] - Remaining packet delay budget;

[0133] -The number of subchannels used for PSSCH / PSCCH transmission in a time slot, L subCH ;

[0134] -Optionally, the resource reservation interval P rsvp_TX , in milliseconds.

[0135] -If the upper layer requests the UE to determine a subset of resources from which the upper layer will select resources for PSSCH / PSCCH transmission as part of the reevaluation or preemption process, the upper layer provides a set of resources that may be subject to reevaluation (r0, r1, r2, ...) and a set of resources that may be subject to preemption (r′0, r′1, r′2, ...).

[0136] - In time slot r i ”-T3 before or after the resource subset requested by the higher layer is determined by the UE implementation. Here, r i " is the time slot with the smallest time slot index among (r0, r1, r2, ...) and (r'0, r'1, r'2, ...), T3 and T SL proc,1 Here, T SL proc,1 Defined as the time slot in Table X1, μ SL It is the SCS configuration of SLBWP.

[0137] The following high-level parameters influence this process:

[0138] -sl-SelectionWindowList: for prio TX The given value of the internal parameter T 2min Set to the corresponding value from the higher-level parameter sl-SelectionWindowList.

[0139] -sl-Thres-RSRP-List: This high-level parameter is for each combination (p i ,p j ) provides the RSRP threshold, where p i is the value of the priority field in the received SCI format 1-A, and p j is the priority of the UE's transmission for selecting resources; for a given invocation of this procedure, p j =prio TX .

[0140] -sl-RS-ForSensing: Selects whether the UE uses PSSCH-RSRP or PSCCH-RSRP measurement.

[0141] -sl-ResourceReservePeriodList

[0142] -sl-SensingWindow: The internal parameter T0 is defined as the number of time slots corresponding to sl-SensingWindow milliseconds.

[0143] -sl-TxPercentageList: For a given prio TX The internal parameter X is defined as sl-TxPercentageListprio which converts from percentage to ratio. TX .

[0144] -sl-PreemptionEnable: If sl-PreemptionEnable is set and its value is not equal to "enabled", the internal parameter prio pre Set to the parameter sl-PreemptionEnable provided by higher layers.

[0145] Resource reservation interval P rsvp_TX (if set) Convert from milliseconds to logical slots, generating P' rsvp_TX .

[0146] Explanation of symbols:

[0147] It can represent the set of time slots belonging to the side link resource pool.

[0148] For example, the UE may select a candidate resource set (Sa) based on Table 5. For example, when resource (re)selection is triggered, the UE may select a candidate resource set (Sa) based on Table 5. For example, when re-evaluation or preemption is triggered, the UE may select a candidate resource set (Sa) based on Table 5.

[0149] The UE may perform operations in the following steps based on the decoded PSCCH and the RSRP measured on the time slot.

[0150] [Table 5]

[0151]

[0152]

[0153] In addition, partial sensing may be supported for power saving of the UE. For example, in LTE SL or LTE V2X, the UE may perform partial sensing based on Table 6 and Table 7.

[0154] [Table 6]

[0155]

[0156]

[0157] [Table 7]

[0158]

[0159]

[0160] Reference Figure 8(a) or (b), for example, the first UE may send the SCI to the second UE via the PSCCH. Alternatively, for example, the first UE may send two consecutive SCIs (e.g., level 2 SCIs) to the second UE via the PSCCH and / or the PSSCH. In this case, the second UE may decode the two consecutive SCIs (e.g., level 2 SCIs) to receive the PSSCH from the first UE. In the present disclosure, the SCI sent via the PSCCH may be referred to as the first SCI, the first SCI, the first level SCI, or the first level SCI format, and the SCI sent via the PSSCH may be referred to as the second SCI, the second SCI, the second level SCI, or the second level SCI format. For example, the first level SCI format may include SCI format 1-A, and the second level SCI format may include SCI format 2-A and / or SCI format 2-B.

[0161] Hereinafter, an example of SCI format 1-A will be described.

[0162] SCI format 1-A is used for scheduling of PSSCH and secondary SCI on PSSCH.

[0163] The following information is sent using SCI Format 1-A:

[0164] - Priority - 3 bits

[0165] - Frequency resource assignment - When the value of the higher layer parameter sl-MaxNumPerReserve is configured as 2, the ceiling (log2 (N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, when the value of the higher-level parameter sl-MaxNumPerReserve is configured as 3, the ceiling log2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits

[0166] - Time Resource Assignment - 5 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured as 2; otherwise, 9 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured as 3

[0167] -Resource reservation period – If the higher-level parameter sl-MultiReserveResource is configured, it is ceiling(log2 N rsv_period ) bits, where Nrsv_period is the number of entries in the higher-level parameter sl-ResourceReservePeriodList; otherwise 0 bits

[0168] -DMRS mode - is ceiling(log2 N pattern ) bits, where N pattern The number of DMRS patterns configured by the higher-level parameter sl-PSSCH-DMRS-TimePatternList

[0169] - Second level SCI format - 2 bits, as defined in Table 8

[0170] -Beta_offset indicator - 2 bits, set by the higher layer parameter sl-BetaOffsets2ndSCI

[0171] - Number of DMRS ports - 1 bit, as defined in Table 9

[0172] - Modulation and coding scheme - 5 bits

[0173] - Additional MCS table indicator - 1 bit if one MCS table is configured by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured by the higher layer parameter sl-Additional-MCS-Table; otherwise, 0 bit

[0174] -PSFCH overhead indicator - 1 bit if the higher layer parameter sl-PSFCH-Period = 2 or 4; otherwise, 0 bit

[0175] - Reserved - The number of bits determined by the higher layer parameter sl-NumReservedBits, whose value is set to zero.

[0176] [Table 8]

[0177] The value of the second level SCI format field Second level SCI format 00 SCI Format 2-A 01 SCI Format 2-B 10 Reserve 11 Reserve

[0178] [Table 9]

[0179] The value of the DMRS Port Quantity field Antenna Port 0 1000 1 1000 and 1001

[0180] Hereinafter, an example of SCI format 2-A will be described.

[0181] When the HARQ-ACK information includes ACK or NACK, when the HARQ-ACK information includes only NACK, or when there is no HARQ-ACK information feedback, SCI format 2-A is used to decode the PSSCH using the HARQ operation.

[0182] The following information is sent using SCI Format 2-A:

[0183] -HARQ process number - 4 bits

[0184] - New Data Indicator - 1 bit

[0185] - Redundancy version - 2 bits

[0186] - Source ID - 8 bits

[0187] - Destination ID - 16 bits

[0188] -HARQ feedback enable / disable indicator - 1 bit

[0189] - Broadcast type indicator - 2 bits, as defined in Table 10

[0190] -CSI request - 1 bit

[0191] [Table 10]

[0192] The value of the broadcast type indicator Broadcast Type 00 broadcast 01 When the HARQ-ACK information includes ACK or NACK, multicast 10 Unicast 11 When the HARQ-ACK information includes only NACK, the multicast

[0193] Hereinafter, an example of SCI format 2-B will be described.

[0194] When the HARQ-ACK information includes only NACK or when there is no HARQ-ACK information feedback, SCI format 2-B is used to decode the PSSCH using the HARQ operation.

[0195] The following information is sent using SCI Format 2-B:

[0196] -HARQ process number - 4 bits

[0197] - New Data Indicator - 1 bit

[0198] - Redundancy version - 2 bits

[0199] - Source ID - 8 bits

[0200] - Destination ID - 16 bits

[0201] -HARQ feedback enable / disable indicator - 1 bit

[0202] - Region ID - 12 bits

[0203] -Communication range requirement - 4 bits, determined by the higher-level parameter sl-ZoneConfigMCR-Index

[0204] Reference Figure 8For (a) or (b) above, in step S830, the first UE may receive the PSFCH. For example, the first UE and the second UE may determine the PSFCH resource, and the second UE uses the PSFCH resource to send HARQ feedback to the first UE.

[0205] The following describes the process of the UE reporting HARQ-ACK on the side link.

[0206] The UE may be indicated by the SCI format to send a PSFCH including HARQ-ACK information in response to the reception of the PSSCH, and this SCI format schedules the reception of the PSSCH on one or more secondary channels. The UE provides HARQ-ACK information including ACK or NACK or only NACK. PSSCH subch The UE may be provided with the number of time slots in the resource pool for the PSFCH transmission timing resource by sl-PSFCH-Period-r16. If this number is zero, the PSFCH transmission from the UE is disabled in this resource pool. If k mod N PSFCH PSSCH = 0, the UE expects to have a PSFCH transmission timing resource in time slot t' k SL (0 ≤ k < T'max), where t' k SL is a time slot in the resource pool, T' max is the number of time slots in the resource pool within 10240 milliseconds, and N PSFCH PSSCH is provided in sl-PSFCH-Period-r16. The UE may be indicated by the upper layer not to send a PSFCH when receiving the PSSCH. If the UE receives the PSSCH in the resource pool and the value of the HARQ feedback enable / disable indicator field included in the associated SCI format 2-A or SCI format 2-B is 1, the UE provides HARQ-ACK information via the PSFCH transmission in the resource pool. The UE sends the PSFCH in the first time slot, where the first time slot is the time slot after the minimum number of time slots provided by sl-MinTimeGapPSFCH-r16 of the resource pool that includes the PSFCH resource and is after the last time slot of the PSSCH reception.

[0208] The UE is provided with M of the PRBs in the resource pool for the PSFCH transmission on the PRBs in the resource pool by sl-PSFCH-RB-Set-r16. For the number of PSSCH time slots related to the PSFCH time slot, it is less than or equal to N PSFCH PRB,set and N subch and N​​​PSFCH PSSCH (the number of subchannels in the resource pool provided by sl-NumSubchannel), the M of the UE for slot i and subchannel j in the PSSCH slot associated with the PSFCH slot PRB,set PSFCH PRB[(i+jN PSFCH PSSCH )-M PSFCH subch,slot ,(i+1+jN PSFCH PSSCH )-M PSFCH subch,slot -1]. Here M PSFCH subch,slot =M PSFCH PRB,set / (N subch -N PSFCH PSSCH ), 0≤i <N PSFCH PSSCH , 0≤j <N subch , and the allocation starts in ascending order for i and continues in ascending order for j. The UE expects M PSFCH PRB,set YesN subch ·N PSFCH PSSCH multiples of.

[0209] The UE determines the number of available PSFCH resources for multiplexing the HARQ-ACK information included in the PSFCH transmission as R PSFCH PRB,CS =N PSFCH type ·M PSFCH subch,slot ·N PSFCH CS Here, N PSFCH CS It can be the number of cyclic shift pairs for the resource pool, and based on the upper layer indication,

[0210] -N PSFCH type =1, and M PSFCH subch,slot The PRB may be associated with the starting subchannel of the corresponding PSSCH.

[0211] -N PSFCH type =N PSSCH subch , and N PSSCH subch ·M PSFCH subch,slotPRB and corresponding PSSCH N PSSCH subch One or more of the sub-channels are correlated.

[0212] PSFCH resources first press N PSFCH type ·M PSFCH subch,slot The PRB indices in the N PRBs are indexed in ascending order, and then PSFCH CS The cyclic shift pairs are indexed in ascending order of the cyclic shift pair indices.

[0213] In response to PSSCH reception, the UE determines the index of the PSFCH resource for PSFCH transmission as (P ID +M ID )modR PSFCH PRB,CS Here, P ID is the physical layer source ID provided by SCI format 2-A or 2-B for scheduling PSSCH reception, M ID ID of the UE receiving the PSSCH indicated by the upper layer when the UE detects SCI format 2-A with the broadcast type indicator field value of "01", otherwise M ID is 0.

[0214] UE uses Table 11 according to N PSFCH CS The cyclic shift pair index corresponding to the PSFCH resource index determines the m0 value used to calculate the cyclic shift α value.

[0215] [Table 11]

[0216]

[0217] As shown in Table 12, when the UE detects SCI format 2-A with a broadcast type indicator field value of "01" or "10", or as shown in Table 13, when the UE detects SCI format 2-A or SCI format 2-B with a broadcast type indicator field value of "11", the UE determines m for calculating the cyclic shift α value. cs The UE applies one of the cyclic shifts to the sequence used in PSFCH transmission.

[0218] [Table 12]

[0219] HARQ-ACK value 0(NACK) 1(ACK) Sequence cyclic shift 0 6

[0220] [Table 13]

[0221] HARQ-ACK value 0(NACK) 1(ACK) Sequence cyclic shift 0 N / A

[0222] Reference Figure 8 (a), in step S840, the first UE may send SL HARQ feedback to the base station via PUCCH and / or PUSCH.

[0223] Fig. 9 Three types of broadcasts are shown in accordance with embodiments of the present disclosure. Fig. 9 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig. 9 (a) shows broadcast type SL communication, Fig. 9 (b) in FIG. 4 shows unicast type SL communication, and Fig. 9 (c) shows multicast SL communication. In the case of unicast SL communication, the UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0224] Due to the overlapping frequency bands between LTE and NR, two RATs may exist in the same channel. Since NR supports PSFCH and can send HARQ feedback of multiple PSSCH on PSFCH resources, this may generate high power, and AGC saturation problems may occur when the LTE resources previously occupied by the PSFCH resources overlap with the NR PSFCH resources. For example, if the NRSL module (or device) excludes all NRSL candidate resources for PSFCH transmission opportunity resources that overlap with LTE SL reserved resources in the time domain in order to reduce the probability of AGC problems in LTE receiving UEs, the number of remaining selectable NRSL candidate resources may be excessively reduced, resulting in an increased probability of NR SL transmission resource conflicts between different NR SL UEs (with similar NR SL sensing results).

[0225] If the SCS value between LTE SL and NR SL is configured differently (for example, the SCS of NR SL is 30KHZ), the NR SL transmit power between the first NRSL time slot overlapping with the LTE SL subframe and the remaining (second and subsequent) NR SL time slots is different, the LTE receiving UE may encounter AGC problems when receiving packets on the LTE SL subframe.

[0226] In addition, in future systems, the UE may perform sidelink transmission and / or reception operations in an unlicensed band. For operations in an unlicensed band, according to band-specific regulations or requirements, the UE's transmission may be preceded by a channel sensing operation (e.g., energy detection / measurement) for the channel to be used, and as a result of the channel sensing, the UE may perform transmission in the unlicensed band only when it is determined that the channel or RB set to be used is idle (e.g., if the measured energy is less than, equal to, or greater than a specific threshold), and if it is determined that the channel or RB set to be used is busy (e.g., if the measured energy is greater than, equal to, or greater than a specific threshold) according to the result of the channel sensing, the UE may cancel all or part of the transmission in the unlicensed band.

[0227] In addition, in operation in an unlicensed band, the UE may omit or simplify the channel sensing operation (i.e., make the channel sensing interval relatively small) within a specific time interval after transmission within a specific time period, or, in contrast, after a specific time interval after transmission, the UE may decide whether to transmit after performing the usual channel sensing operation.

[0228] On the other hand, in transmission in an unlicensed band, according to regulations or requirements, the time interval and / or the size of the frequency occupied area and / or the power spectral density (PSD) of the signal / channel sent by the UE may be greater than or equal to a specific level, respectively.

[0229] On the other hand, in the unlicensed band, in order to simplify channel sensing, the channel occupation time (COT) duration information can be used to notify that it occupies the channel obtained through the initial general channel sensing within a specific time period, and the maximum value of the length of the COT duration can be set differently according to the priority value of the service or data packet or the channel access priority category (CAPC).

[0230] On the one hand, the base station can share its obtained COT duration through channel sensing in the form of DCI transmission, and the UE can perform a specific (indicated) channel sensing type and / or CP extension within the COT duration based on the DCI information received from the base station. On the other hand, the UE can share its COT duration ensured by channel sensing with the base station that is the destination of the UE's UL transmission, and can provide relevant information through the UL via CG-UCI. In the above case, the base station can perform simplified channel sensing within the COT duration shared by the UE.

[0231] In the case of SL communication, there are cases where the base station instructs the UE to use resources for SL transmission through DCI or RRC signaling (e.g., Mode 1RA operation), and there are cases where the UE performs SL transmission and reception through sensing operations between UEs without the assistance of the base station (e.g., Mode 2RA operation).

[0232] On the other hand, for channel access type 1 which can be used regardless of the channel occupancy time (COT) configuration, the procedures for DL ​​transmission shown in Tables 14 and 15 and the procedures for UL transmission shown in Tables 16 and 17 are performed.

[0233] In the present disclosure, channel access may be substituted / replaced with channel sensing.

[0234] [Table 14]

[0235]

[0236]

[0237] [Table 15]

[0238]

[0239] [Table 16]

[0240]

[0241]

[0242] [Table 17]

[0243]

[0244] On the other hand, during the channel occupation time (COT), a simplified channel access type 2 may be used prior to transmission, and the procedure for DL ​​transmission shown in Table 18 and the procedure for UL transmission shown in Table 19 may be performed.

[0245] [Table 18]

[0246]

[0247] [Table 19]

[0248]

[0249] According to one embodiment of the present disclosure, type 2A SL channel access may be performed in the same manner as type 2A DL and / or UL channel access, with a sensing interval of T_short_sl=25us and a T_f=16us interval immediately following a sensing interval consisting of one sensing slot, wherein T_f includes the sensing slot at the beginning. For basic idle determination, the DL or UL scheme may also be used.

[0250] According to one embodiment of the present disclosure, type 2B SL channel access may be performed in the same manner as type 2B DL ​​and / or UL channel access, wherein the sensing interval T_f=16us, wherein T_f includes the sensing time slot at the end of the 9us interval. For basic idle determination, a DL or UL scheme may also be used.

[0251] According to one embodiment of the present disclosure, type 2C SL channel access may be performed in the same manner as type 2C DL and / or UL channel access, so that channel sensing is not performed. Instead, the time interval of SL transmission may be up to 584us.

[0252] According to one embodiment of the present disclosure, Type 1SL channel access is performed in the same manner as Type 1DL and / or UL channel access, wherein: i) a random integer value N is derived based on a contention window size corresponding to a priority category, ii) if the channel sensing result within a delay duration of size T_d corresponding to the priority category is idle, the counter value is decremented to N-1 in units of T_sl when idle; and iii) if the counter value is zero, the UE can occupy the RB set or channel subjected to channel sensing.

[0253] However, if some channel sensing results for the above T_sl interval are determined to be idle, the counter value can be maintained and channel sensing can be continued until the channel sensing results in units of a delay duration of size T_d become idle again. In the above, the delay duration of length T_d can be in the form of m_p consecutive T_sls after T_f=16us, where m_p is a value determined according to the priority category p, and can be a time interval for performing channel sensing at T_sl=9us.

[0254] According to one embodiment of the present disclosure, when the UE has occupied the channel via a type 1 SL channel access and the UE is not ready to send a side link transmission, the UE may configure a delay duration of length T_d and a sensing interval of length T_sl immediately before preparing to send the side link transmission, and if both are idle, the UE may immediately perform the side link transmission. Here, if either of them is busy, the UE may perform type 1 SL channel access again.

[0255] For example, if sidelink transmission is difficult at the end of channel sensing (for example, if channel sensing ends after sidelink transmission starts), the UE may reselect sidelink transmission resources. For example, the reselected resources may be selected in consideration of the end time of channel sensing and / or the length of the remaining sensing interval. For example, the remaining sensing interval may be a value derived by assuming that channel sensing is completely idle.

[0256] In addition, in the present disclosure, a sending UE (i.e., TX UE) may be a UE that sends data to a (target) receiving UE (i.e., RX UE). For example, the sending UE may be a UE that performs PSCCH transmission and / or PSSCH transmission. For example, the sending UE may be a UE that sends a SL CSI-RS and / or a SL CSI report request indication to a (target) receiving UE. For example, the sending UE may be a UE that sends a SL (L1) RSRP report request indicator and / or a (predefined) reference signal (e.g., PSSCH demodulation reference signal (DM-RS)) for SL (L1) RSRP measurement to a (target) receiving UE. For example, the sending UE may be a UE that sends a (control) channel for SL radio link monitoring (RLM) operation and / or SL radio link failure (RLF) operation of a (target) receiving UE and / or sends a reference signal (e.g., DM-RS, CSI-RS, etc.) through a (control) channel (e.g., PSCCH, PSSCH, etc.).

[0257] In addition, in the present disclosure, a receiving UE (i.e., a receiving UE) may be a UE that sends SLHARQ feedback to a transmitting UE (i.e., a transmitting UE) based on whether the data sent by the transmitting UE is successfully decoded and / or whether the PSCCH (related to PSSCH scheduling) sent by the transmitting UE is successfully detected / decoded. For example, the receiving UE may be a UE that performs SL CSI transmission to the transmitting UE based on the SL CSI report request indication and / or SL CSI-RS received from the transmitting UE. For example, the receiving UE may be a UE that sends a SL (L1) RSRP measurement value based on a (predefined) reference signal measurement and / or a SL (L1) RSRP report request indication received from the transmitting UE to the transmitting UE. For example, the receiving UE may be a UE that sends its own data to the transmitting UE. For example, the receiving UE may be a UE that performs SLRLM operation and / or SLRLF operation based on a (preconfigured) (control) channel received from the transmitting UE and / or a reference signal received through the (control) channel.

[0258] According to one embodiment of the present disclosure, when a receiving UE sends SL HARQ feedback information for a PSSCH (and / or PSCCH) received from a transmitting UE, some of the following schemes may be considered. For example, the scheme (part of the scheme) may be limitedly applied only when the receiving UE successfully decodes / detects the PSCCH for which the PSSCH is scheduled.

[0259] - Option 1) Send NACK information only when PSSCH decoding / reception fails

[0260] - Option 2) Send ACK information when PSSCH decoding / reception is successful, and send NACK information when it fails

[0261] In addition, in the present disclosure, the transmitting UE may send all or part of the information described below to the receiving UE via the SCI. For example, the transmitting UE may send all or part of the information described below to the receiving UE via the first SCI and / or the second SCI.

[0262] -PSSCH (and / or PSCCH) related resource allocation information (e.g., number / location of time / frequency resources, resource reservation information (e.g., period))

[0263] -SL CSI report request indicator or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) report request indicator

[0264] -SL CSI transmission indicator (or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) information transmission indicator) (on PSSCH)

[0265] - Modulation and Coding Scheme (MCS) information

[0266] - Transmit power information

[0267] - L1 destination ID information and / or L1 source ID information

[0268] -SL HARQ process ID information

[0269] -New Data Indicator (NDI) information

[0270] - Redundancy Version (RV) information

[0271] - (Transmission service / packet related) QoS information (e.g. priority information)

[0272] - SL CSI-RS transmission indicator or information about the number of SL CSI-RS antenna ports (to be transmitted)

[0273] - The location information of the sending UE or the location (or distance area) of the target receiving UE (UE requesting SL HARQ feedback)

[0274] -Reference signal (e.g., DM-RS, etc.) information related to decoding and / or channel estimation of data to be sent through the PSSCH. For example, the reference signal information may be information related to a pattern of (time-frequency) mapping resources of the DM-RS, rank information, antenna port index information, information about the number of antenna ports, and the like.

[0275] In addition, in the present disclosure, for example, PSCCH may be replaced / replaced by at least one of SCI, first SCI (first-level SCI) and / or second SCI (second-level SCI), or vice versa. For example, SCI may be replaced / replaced by at least one of PSCCH, first SCI and / or second SCI, or vice versa. For example, PSSCH may be replaced / replaced by second SCI and / or PSCCH, or vice versa.

[0276] In addition, in the present disclosure, for example, if the SCI configuration field is divided into two groups in consideration of a (relatively) high SCI payload size, the SCI including the first SCI configuration field group may be referred to as the first SCI or the 1st SCI, and the SCI including the second SCI configuration field group may be referred to as the second SCI or the 2nd SCI. For example, the 1st SCI and the 2nd SCI may be sent via different channels. For example, the transmitting UE may send the first SCI to the receiving UE via the PSCCH. For example, the second SCI may be sent to the receiving UE via the (independent) PSCCH, or may be sent in a piggyback manner via the PSSCH together with the data.

[0277] In addition, in the present disclosure, for example, "configuration" or "definition" may mean (pre) configuration from a base station or a network. For example, "configuration" or "definition" may mean a resource pool specific (pre) configuration from a base station or a network. For example, a base station or a network may send information related to "configuration" or "definition" to a UE. For example, a base station or a network may send information related to "configuration" or "definition" to a UE via predefined signaling. For example, the predefined signaling may include at least one of RRC signaling, MAC signaling, PHY signaling, and / or SIB.

[0278] In addition, in the present disclosure, for example, "configuration" or "definition" may mean to be specified or configured through pre-configuration signaling between UEs. For example, information related to "configuration" or "definition" may be sent or received through pre-configuration signaling between UEs. For example, the pre-defined signaling may include at least one of RRC signaling, MAC signaling, PHY signaling, and / or SIB.

[0279] Furthermore, in the present disclosure, for example, RLF (Radio Link Failure) may be replaced / substituted by Out-of-Sync (OOS) and / or In-Sync (IS), and vice versa.

[0280] In addition, in the present disclosure, for example, a resource block (RB) may be replaced / replaced by a subcarrier, and vice versa. For example, depending on the transport layer, a packet or service may be replaced / replaced by a transport block (TB) or a medium access control protocol data unit (MAC PDU), and vice versa. For example, a code block group (CBG) may be replaced / replaced by a TB, and vice versa. For example, a source ID may be replaced / replaced by a destination ID, and vice versa. For example, an L1 ID may be replaced / replaced by an L2 ID, and vice versa. For example, an L1 ID may be an L1 source ID or an L1 destination ID. For example, an L2 ID may be an L2 source ID or an L2 destination ID.

[0281] In addition, in the present disclosure, for example, the operation of sending a UE to reserve / select / determine retransmission resources may include the operation of sending a UE to reserve / select / determine potential retransmission resources, where the actual use is determined based on the SL HARQ feedback information received from the receiving UE.

[0282] Furthermore, in the present disclosure, a sub-selection window may be replaced / substituted by a selection window and / or a preconfigured number of resource sets within the selection window, and vice versa.

[0283] In addition, in the present disclosure, SLMODE 1 may refer to a resource allocation method or communication method in which a base station directly schedules SL transmission resources for a sending UE through predefined signaling (e.g., DCI or RRC message). For example, SLMODE 2 may refer to a resource allocation method or communication method in which a UE independently selects SL transmission resources from a resource pool preconfigured or configured by a base station or a network. For example, a UE that performs SL communication based on SL MODE 1 may be referred to as a MODE 1UE or a MODE 1 sending UE, and a UE that performs SL communication based on SL MODE 2 may be referred to as a MODE 2UE or a MODE 2 sending UE.

[0284] In addition, in the present disclosure, for example, a dynamic grant (DG) may be replaced / substituted by a configuration grant (CG) and / or a semi-persistent scheduling (SPS) grant, and vice versa. For example, the DG may be replaced / substituted by a combination of a CG and an SPS grant, and vice versa. For example, the CG may include at least one of a configuration grant (CG) type 1 and / or a configuration grant (CG) type 2. For example, in CG type 1, the grant may be provided via RRC signaling and stored as a configuration grant. For example, in CG type 2, the grant may be provided via PDCCH and stored or deleted as a configuration grant based on L1 signaling indicating activation or deactivation of the grant. For example, in CG type 1, the base station may allocate periodic resources to the sending UE via an RRC message. For example, in CG type 2, the base station may allocate periodic resources to the sending UE via an RRC message, and the base station may dynamically activate or deactivate the periodic resources via DCI.

[0285] In addition, in the present disclosure, a channel may be replaced / substituted by a signal, and vice versa. For example, the transmission / reception of a channel may include the transmission / reception of a signal. For example, the transmission / reception of a signal may include the transmission / reception of a channel. For example, a broadcast may be replaced / substituted by at least one of unicast, multicast, and / or broadcast, and vice versa. For example, a broadcast type may be replaced / substituted by at least one of unicast, multicast, and / or broadcast, and vice versa. For example, a broadcast or a broadcast type may include unicast, multicast, and broadcast.

[0286] Furthermore, in the present disclosure, a resource may be replaced / substituted by a time slot or a symbol, and vice versa. For example, a resource may include a time slot and / or a symbol.

[0287] In addition, in the present disclosure, priority may be replaced / substituted by at least one of logical channel priority (LCP), latency, reliability, minimum required communication range, per packet priority (PPPP), side link radio bearer (SLRB), QoS profile, QoS parameters and / or requirements, and vice versa.

[0288] In addition, in the present disclosure, for example, for convenience of description, a (physical) channel used when a receiving UE sends at least one of the following information to a transmitting UE may be referred to as a PSFCH.

[0289] -SL HARQ feedback, SL CSI, SL (L1) RSRP.

[0290] In addition, when performing side link communication, the method in which the transmitting UE reserves or predetermines transmission resources for the receiving UE is mainly as follows.

[0291] For example, the transmitting UE may perform transmission resource reservation based on the chain. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE may send location information for less than K transmission resources to the receiving UE through an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, for example, the SCI may include location information for less than K transmission resources. Alternatively, for example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE may send location information for less than K transmission resources to the receiving UE through an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI may include location information for less than K transmission resources. In this case, for example, by only signaling the receiving UE with location information for less than K transmission resources by an SCI sent by the transmitting UE at any (or specific) transmission time or time resource, performance degradation due to excessive increase in the payload of the SCI can be prevented.

[0292] Fig.10 A method for a UE that has reserved transmission resources to notify another UE of the transmission resources according to an embodiment of the present disclosure is shown. Fig.10 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0293] Specifically, for example, Fig.10 (a) shows that in the case of K=4, the transmitting UE performs a chain-based resource reservation method by sending / signaling the location information of (up to) 2 transmission resources to the receiving UE via one SCI. For example, Fig.10 (b) shows that in the case of K=4, the transmitting UE performs a chain-based resource reservation method by sending / signaling the location information of (up to) 3 transmission resources to the receiving UE via one SCI. Fig.10 (a) and (b), the transmitting UE may send / signal only the location information of the resources related to the fourth transmission to the receiving UE via the PSCCH related to the fourth (or last) transmission. Fig.10 (a), the transmitting UE may send / signal not only the location information of the fourth transmission-related resources to the receiving UE through the fourth (or last) transmission-related PSCCH, but also send / signal the location information of the third transmission-related resources. Fig.10 (b), the transmitting UE may send / signal not only the location information of the fourth transmission-related resource to the receiving UE through the fourth (or last) transmission-related PSCCH, but also send / signal the location information of the second transmission-related resource and the third transmission-related resource. In this case, for example, Fig.10 In (a) and (b), if the transmitting UE transmits / signals only the location information of the fourth transmission-related resources to the receiving UE through the fourth (or last) transmission-related PSCCH, the transmitting UE may set or specify the field / bit of the location information of the unused or remaining transmission resources to a preconfigured value (e.g., 0). Fig.10 In (a) and (b), if the sending UE sends / signals to the receiving UE only the location information of the resources related to the fourth transmission through the PSCCH related to the fourth (or last) transmission, the sending UE can set or designate the field / bit of the location information of the unused or remaining transmission resources to a preconfigured state / bit value indicating / representing the last transmission (out of the 4 transmissions).

[0294] In addition, for example, the transmitting UE may perform reservation of transmission resources on a block basis. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE may send location information for the K transmission resources to the receiving UE at any (or specific) transmission time or time resource through the SCI sent to the receiving UE. That is, the SCI may include location information for the K transmission resources. For example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE may send location information for the K transmission resources to the receiving UE at any (or specific) transmission time or time resource through the SCI sent to the receiving UE. That is, the SCI may include location information for the K transmission resources. For example, Fig.10 (c) shows that in the case of K=4, the transmitting UE performs a block-based resource reservation method by signaling location information of four transmission resources to the receiving UE via one SCI.

[0295] According to one embodiment of the present disclosure, some or all of the following rules may be configured to achieve coexistence between LTE SL and NR SL (on the same channel). For example, when the SCS (and / or CP type, such as normal CP, extended CP) between LTE SL and NR SL is configured differently (or identically) (and / or when LTE SL and NR SL coexist in the same channel (and / or carrier and / or resource pool)), any (some or all) of the following rules may be (limitedly) applied.

[0296] For example, when configuring LTE SL and / or NR SL related resource pools, SL SSB resources of different SL types (e.g., LTE SL, NR SL) may not be included, and / or the LTE SL related resource pool may not include NR SLPSFCH resources.

[0297] For example, in order to alleviate the degradation of synchronization detection performance due to the (partial) overlap of PSSCH (and / or PSCCH and / or PSFCH) on SL SSBs of different SL types, PSSCH (and / or PSCCH and / or PSFCH) resource selection and / or transmission can be performed (preferentially or exclusively) in resource areas that do not overlap (as little as possible) with SL PSS / SSS symbols of different SL types. For example, if the SCS of the NR SL is configured to 30kHz, the resources on the odd-numbered NR time slots can be used (preferentially or exclusively) for NR SL resource selection and / or transmission. For example, the SCS of the LTE SL can be fixed to 15kHz. For example, odd-numbered NR time slots can be interpreted as time slots located at a later position within a 1ms subframe.

[0298] For example, NR SL communication based on LTE SL SSB (and / or LTE SL synchronization reference) may be (limitedly) allowed only when the SCS of NR SL is configured to be 15kHz (and / or below a preconfigured threshold). This may be because, for example, if the SCS of NR SL is configured to be greater than 15kHz, the performance degradation of NR SL may be relatively increased due to synchronization errors related to LTE SL SSB (and / or LTE SL synchronization reference).

[0299] For example, from the perspective of a single UE, it may be difficult to simultaneously perform reception operations and transmission operations between an LTE SL module (or device) and an NR SL module (or device) (due to implementation limitations). With this in mind, for example, the time domain (and / or ratio) in which reception operations (e.g., for sensing purposes) (and / or transmission operations) of a specific SL type (e.g., LTE SL) are performed may be configured separately (preferentially or limitedly).

[0300] And / or, for example, it can be configured such that reception operations (and / or transmission operations) on resources associated with channels / signals of a preconfigured specific SL type (e.g., LTE SLSSB) (and / or SL channels / signals with relatively high priority (and / or above a preconfigured threshold level)) take precedence over transmission operations (and / or reception operations) of other SL types (e.g., NRSL).

[0301] For example, in a resource region where reception operations of a particular SL type are prioritized, resource selection and / or transmission of other SL types may not be allowed or may be performed with a lower priority.

[0302] For example, according to the capability related to the minimum time (MIN_REQTIME) required for information exchange between the LTE SL module (or device) and the NR SL module (or device), it can be determined which operation to apply between the dynamic sharing operation and the (semi-) static sharing operation between the LTE SL and the NR SL on the same resource pool (and / or channel and / or carrier). For example, the dynamic sharing operation may be allowed to be applied only if the MIN_REQTIME value is shorter than a preconfigured threshold criterion.

[0303] For example, depending on the number / proportion (and / or congestion level) of LTE UEs in a resource pool (and / or channel and / or carrier) where LTE SL and NR SL coexist, the corresponding threshold criteria may be configured differently (and / or the application / permission of dynamic sharing operation (or semi-static sharing operation) may be configured differently).

[0304] For example, the operation of NR SL coexisting with LTE SL on the same resource pool (and / or channel and / or carrier) may be allowed only if NR SL operates based on a preconfigured type of synchronization reference (e.g., GNSS) (and / or if the (synchronization) timing difference between LTE SL and NR SL is less than a preconfigured threshold (e.g., CP length)). For example, when NR SL and LTE SL coexist on the same resource pool (and / or channel and / or carrier), NR SL operation may be performed according to the (synchronization) timing associated with LTE SL.

[0305] According to one embodiment of the present disclosure, in order to achieve coexistence of LTE SL and NR SL on the same channel, the NR SL resource pool with PSFCH resources can be configured to operate / use according to (part or all of) the following rules. For example, for ease of explanation, the PSFCH resource period configured based on the existing rel-16 / 17 standard and the minimum time gap between the PSFCH linked to the PSSCH are named "ORI_PF_PERIOD" and "ORI_MIN_GAP", respectively.

[0306] For example, for an NR SL resource pool that overlaps (partially or completely) with an LTE SL resource pool, a PSFCH resource of a new period (NEW_PF_PERIOD) may be configured that consists of a (partial) subset of the PSFCH resources based on the ORI_PF_PERIOD. For example, the NEW_PF_PERIOD value may be configured to be greater than the value of the ORI_PF_PERIOD (e.g., in the form of a multiple of the ORI_PF_PERIOD value).

[0307] For example, the UE may be configured to perform transmission resource selection / reservation only for PSSCH resources linked to PSFCH resources based on NEW_PF_PERIOD (associated with packets requiring SLHARQ feedback). For example, PSSCH resources linked to PSFCH resources based on NEW_PF_PERIOD may be derived / determined based on ORI_MIN_GAP (and / or a parameter related to the minimum time gap between the newly configured PSSCH and the linked PSFCH (NEW_MIN_GAP)).

[0308] For example, when selecting / reserving transmission resources associated with packets that do not require SLHARQ feedback, PSFCH resources based on ORI_PF_PERIOD (and / or NEW_PF_PERIOD and / or ORI_MIN_GAP and / or NEW_MIN_GAP) can be used to determine the minimum time gap (MINGAP_ADJ_RSC) between two consecutive transmissions (e.g., initial transmission and retransmission, retransmission and retransmission, etc.).

[0309] For example, if the (remaining) packet delay budget (PDB) amount of the packets to be sent (requiring SL HARQ feedback) is less than a preconfigured threshold level (and / or the priority (and / or reliability requirement) is higher than a preconfigured threshold level), the UE may (exceptional) be allowed to select / reserve transmission resources considering PSFCH resources based on ORI_PF_PERIOD (and / or ORI_MIN_GAP). Here, for example, if these conditions are not met, transmission resource selection / reservation considering PSFCH resources based on NEW_PF_PERIOD (and / or NEW_MIN_GAP and / or ORI_MIN_GAP) (and / or PSSCH resources linked only to PSFCH resources based on NEW_PF_PERIOD (and / or NEW_MIN_GAP and / or ORI_MIN_GAP)) may be performed.

[0310] For example, PSFCH resources based on ORI_PF_PERIOD (and / or ORI_MIN_GAP) can be opportunistically utilized only when they do not overlap with LTE SL transmissions (of other UEs or its own), while PSFCH resources based on NEW_PF_PERIOD (and / or NEW_MIN_GAP and / or ORI_MIN_GAP) can be configured to be always available.

[0311] For example, if PSFCH resources based on NEW_PF_PERIOD (and / or NEW_MIN_GAP and / or ORI_MIN_GAP) overlap with LTE SL transmissions (of another UE or its own), it may (exceptional) be allowed to consider PSFCH resources and / or transmission resource selection / reservation based on ORI_PF_PERIOD (and / or ORI_MIN_GAP).

[0312] For example, when selecting / reserving transmission resources (associated with a packet requiring SL HARQ feedback), the UE may ensure that the PSFCH resource time points linked to multiple PSSCH resource time points overlap as much as possible. For example, the UE may prioritize the use of PSSCH resources linked to the same time point (associated with (one) TB) for transmission resource selection / reservation. Here, for example, such a rule may only be applied (limitedly) when the (remaining) PDB amount associated with the packet is greater than a preconfigured threshold level (and / or the priority (and / or reliability requirement) is lower than a preconfigured threshold level).

[0313] For example, the NR SL module (or device) may receive LTE SL transmission resource information (of other UEs or itself) (obtained based on LTE sensing operations) from the LTE SL module (or device), and the PHY layer of the NR SL module (or device) may exclude PSSCH resources (and / or PSSCH resources) linked to PSFCH resources overlapping with LTE SL transmission resources from the set of available candidate resources, and may report it to the MAC layer (and / or (together with it) report PSFCH resource information overlapping with LTE SL transmission resources).

[0314] Alternatively, for example, the MAC layer of the NR SL module (or device) may only consider the remaining resources after excluding PSSCH resources linked to PSFCH resources overlapping with LTE SL transmission resources (and / or only considering PSFCH resources not overlapping with LTE SL transmission resources) from the set of selectable candidate resources reported by the PHY layer when selecting / reserving transmission resources. For example, the PHY layer may provide the MAC layer with information related to the remaining resources after excluding PSSCH resources linked to PSFCH resources overlapping with LTE SL transmission resources.

[0315] For example, on the PSFCH resources in the NR SL resource pool, when a PSFCH transmission (with a priority higher than or equal to a preconfigured threshold level) is performed based on a scheme that only feeds back NACK, it can be configured that even if it overlaps with (another UE's) LTE SL transmission resources (measured value, for example, PSSCH / PSCHH DMRS RSRP is lower than or equal to a preconfigured threshold), the transmission is not (exception) omitted. For example, the above-mentioned scheme that only feeds back NACK can be a scheme in which the receiving UE feeds back NACK information to the sending UE only when its PSSCH decoding fails.

[0316] For example, when the NRSL module (or device) passes a set of selectable (or non-selectable) candidate resources (e.g., S_B) derived based on LTE SL sensing to the LTE SL module (or device), (virtual) parameters for selection window size / position information (and / or (remaining) PDB information (and / or priority information) related to transmission packets and / or the number of subchannels related to transmission (and / or retransmission) number information) for LTE SL sensing (related to deriving such a set of candidate resources) can be configured (specifically to the resource pool (and / or service and / or priority and / or QoS requirements)).

[0317] For example, if the proportion (and / or number) of selectable candidate resources among the total resources within the selection window is less than a preconfigured threshold, after the NR SL module (or device) excludes candidate resources that overlap with LTE SL transmission resources already received from the LTE SL module (or device), the UE may not apply the exclusion operation on candidate resources that overlap with LTE SL transmission resources (and / or NR SL transmission resources).

[0318] For example, after the NR SL module (or device) excludes candidate resources overlapping with LTE SL transmission resources received from the LTE SL module (or device), if the proportion (and / or number) of selectable candidate resources among the total resources within the selection window is less than a preconfigured threshold, the proportion greater than or equal to the threshold may be maintained by not excluding (e.g., restoring) some of the candidate resources overlapping with the LTE SL transmission resources (and / or NR SL transmission resources). For example, the proportion greater than or equal to the threshold may be maintained by preferentially restoring candidate resources with relatively low interference (and / or lower than a preconfigured threshold) with LTE SL transmission (and / or NR SL transmission).

[0319] And / or, for example, if the (minimum and / or maximum and / or preconfigured) number of required (NR) packet transmissions cannot be met, the UE may omit the packet transmission or may not apply an exclusion operation for candidate resources that overlap with LTE SL transmission resources (and / or NRSL transmission resources) (received from the LTE SL module (or device)).

[0320] And / or, for example, if the (minimum and / or maximum and / or preconfigured) number of (NR) packet transmissions required cannot be met, the ratio greater than or equal to the threshold may be maintained by not excluding (e.g., restoring) some of the candidate resources that overlap with the LTE SL transmission resources (and / or NR SL transmission resources). For example, the ratio greater than or equal to the threshold may be maintained by preferentially restoring candidate resources whose interference with the LTE SL transmission (and / or NR SL transmission) is relatively low (and / or below a preconfigured threshold).

[0321] And / or, for example, after the NR module (or device) derives the intersection between the candidate resources generated by the NR module (or device) (based on NR SL sensing) and the candidate resources generated by the LTE module (or device) (based on LTE sensing), if the number (and / or proportion) of candidate resources belonging to the intersection (within the selection window) is less than a preconfigured threshold (and / or if the (minimum and / or maximum and / or preconfigured) number required for (NR) packet transmission cannot be met), the UE may omit the packet transmission, or may not apply the exclusion operation for candidate resources that overlap with the LTE SL transmission resources (and / or NRSL transmission resources) (received from the LTE SL module (or device)).

[0322] And / or, for example, after the NR module (or device) derives the intersection between the candidate resources generated by the NR module (or device) (based on NR SL sensing) and the candidate resources generated by the LTE module (or device) (based on LTE sensing), if the number (and / or proportion) of candidate resources belonging to the intersection (within the selection window) is less than a preconfigured threshold (and / or if the (NR) packet transmission cannot meet the (minimum and / or maximum and / or preconfigured) number of transmissions required for the (NR) packet transmission), the proportion greater than or equal to the threshold may be maintained by not excluding (e.g., restoring) some of the candidate resources overlapping with the LTE SL transmission resources (and / or NR SL transmission resources). For example, the proportion greater than or equal to the threshold may be maintained by preferentially restoring candidate resources whose interference with the LTE SL transmission (and / or NR SL transmission) is relatively low (and / or lower than the preconfigured threshold).

[0323] For example, when the NRSL module (or device) receives (LTE) SL RSSI measurement information from the LTE SL module (or device), the NR SL module (or device) may preferentially perform the exclusion operation of (overlapping) candidate resources based on the (LTE) SL RSRP measurement value (and / or priority) provided by the LTE SL module (or device) (related to the LTE SL transmission resources of other UEs and / or its own LTE SL transmission resources). Then, if the proportion of the remaining selectable candidate resources among the total resources within the selection window is greater than a pre-configured threshold, the candidate resources with a lower (LTE) SL RSSI value may be preferentially included in the final set of candidate resources reported to the MAC layer (until the condition that the above-mentioned proportion is greater than or equal to the threshold is met).

[0324] For example, when the NR SL module (or device) (or the LTE SL module (or device)) uses the LTE (or NR) SL priority information (and / or (LTE and / or NR) SL QOS information) (and / or (LTE and / or NR) SLRSRP measurement value (threshold) information and / or (LTE and / or NR) SLRSSI measurement (threshold) information and / or (LTE and / or NR) resource reservation period information and / or subchannel size) and the like related to the LTE (or NR) SL transmission resources of (other) UEs (and / or its own LTE (or NR) SL transmission resources) provided by the LTE SL module (or device) (or the NR SL module (or device)) to perform a determination / elimination operation on selectable candidate resources (for NR (and / or LTE) SL packet transmission), the LTE (or NR) SL priority information (and / or (LTE and / or NR) SLQOS information) (and / or (LTE and / or NR) SLRSRP measurement value (threshold) information and / or (LTE and / or NR) SL The NR (and / or LTE) SL priority information (and / or (NR and / or LTE) SL QOS information) mapped to the RSSI measurement value (threshold) information and / or (LTE and / or NR) resource reservation period information and / or sub-channel size) (and / or (NR and / or LTE) SL RSRP measurement value (threshold) information and / or (NR and / or LTE) SL RSSI measurement value (threshold) information and / or (NR and / or LTE) resource reservation period information and / or sub-channel size) may be pre-configured, or the LTE SL module (or device) (and / or the NR SL module (or device)) may be replaced while being provided (instead of delivering the LTE (and / or NR) SL priority information (and / or (LTE and / or NR) SL QOS information) (and / or (LTE and / or NR) SL RSRP measurement value (threshold) information and / or (LTE and / or NR) SL RSSI measurement value (threshold) information and / or (LTE and / or NR) resource reservation period information and / or sub-channel size)) is (maximum matching) NR (and / or LTE) SL priority information (and / or (NR and / or LTE) SL QOS information) (and / or (NR and / or LTE) SL RSRP measurement value (threshold) information and / or (NR and / or LTE) SL RSSI measurement value (threshold) information and / or (NR and / or LTE) resource reservation period information and / or sub-channel size).

[0325] For example, the NR SL module (or device) may generate / determine (Option A) a (final) set of selectable candidate resources (reported to the MAC layer) by jointly reflecting the information related to the LTE SL transmission resources of other UEs (and / or its own LTE SL transmission resources) received from the LTE SL module (or device) (obtained based on SL sensing) into the NR process-based candidate resource exclusion (and / or selection) process (performed at the NR PHY layer).

[0326] Alternatively, for example, the NR SL module (or device) may generate a set of selectable candidate resources based on the NR process (prioritized), and then, after excluding resources related to other UEs' LTE SL transmissions (and / or its own LTE SL transmissions) from the set based on information passed from the LTE SL module (or device), consider the remaining resources as the (final) selectable candidate set (reported to the MAC layer) (Option B).

[0327] For example, information related to the LTE SL transmission resources of other UEs (and / or its own LTE SL transmission resources) may include (LTE) SL priority information (and / or (LTE) SLQOS information) (and / or (LTE) SL RSRP measurement value (threshold) information and / or (LTE) SLRSSI measurement value (threshold) information and / or (LTE) resource reservation period information and / or subchannel size), etc.

[0328] Here, for example, the NR SL module (or device) may configure / determine a preconfigured proportion of selectable candidate resource set reported to the MAC layer based on the information transmitted from the LTE SL module (or device) among the total candidate resources within the selection window (related to NR SL packet transmission), only for those candidate resources remaining after excluding resources related to other UEs' LTE SL transmissions (and / or its own LTE SL transmissions).

[0329] In addition, for example, it can be configured so that the NR SL module (or device) applies a preconfigured different (or independent) (SL) RSRP threshold when determining whether to exclude candidate resources overlapping with LTE SL transmission resources of other UEs (and / or its own LTE SL transmission resources) based on information received from the LTE SL module (or device) (different from determining whether to exclude candidate resources overlapping with NR SL transmission resources of other UEs (Case 2)). For example, the (SL) RSRP threshold in Case 1 can be configured to be relatively lower than the (SL) RSRP threshold in Case 2. For example, even if the priority related to LTE SL transmission (of other UEs) in Case 1 and the priority related to NR SL transmission (of other UEs) in Case 2 are the same, the (SL) RSRP threshold in Case 1 can be configured to be relatively lower than the (SL) RSRP threshold in Case 2 (to maximize the protection of LTE SL transmission).

[0330] For example, in the above-mentioned case 1, in addition to the preconfigured different (or independent) (SL) RSRP thresholds, the proportion of selectable candidate resources reported to the MAC layer among the total candidate resources (within the selection window) and / or the minimum length of the selection window (e.g., the minimum T2 value) can also be applied.

[0331] According to one embodiment of the present disclosure, when NR SL and LTE SL coexist in the same resource pool (when the SCS value associated with NR SL is configured to be different from (or the same as) the SCS value of LTE SL, for example, 30kHz), PSCCH / PSSCH transmission on the first NR SL time slot (and / or the remaining NR SL time slots) belonging to the LTE SL subframe (for example, 1ms) is allowed only when the PSCCH / PSSCH transmission power value on the first NR SL time slot (and / or the remaining NR SL time slots) belonging to the LTE SL subframe (for example, 1ms) falls within a preconfigured specific range compared with the (sum of) PSFCH transmission power value on the (same) LTE SL subframe, and / or the PSCCH / PSSCH transmission power value on the first NR SL time slot (and / or the remaining NR SL time slots) belonging to the LTE SL subframe can be limited to a preconfigured specific range compared with the (sum of) PSFCH transmission power value on the (same) LTE SL subframe.

[0332] Fig.11 NR SL resources overlapping with LTE SL resources and related NR SL transmission power conditions according to one embodiment of the present disclosure are shown. Fig.10 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0333] Reference Fig.11, showing the overlap of the LTE SL resource, the first NR SL resource and the second NR SL resource in the time domain (i.e., the LTE SL resource overlaps with the first NR SL resource and the second NR SL resource). Fig.11 The situation shown may occur because the SCS in LTE SL is limited to 15kHz while the SCS in NR SL can be 30kHz.

[0334] Here, if the transmission power associated with the second NR SL resource becomes greater than the transmission power associated with the first NR SL resource, the transmission on the LTE SL resource may experience AGC saturation because the AGC operation of the transmission on the LTE SL resource has been completed when the transmission is based on the second NR SL resource.

[0335] Therefore, for NR SL transmission resources, when selecting transmission resources for FDM with LTE SL resources, the later transmission resources for FDM with LTE SL resources can only be selected when the transmission power associated with the transmission selected for the later resources is less than or equal to the transmission power associated with the earlier transmission resources.

[0336] For example, in Fig.11 In the figure, the boundaries of the LTE SL resources, the first NR SL resources and the second NR SL resources are shown to be aligned, but the features of this embodiment can be applied even if only part of the resources are FDM-performed.

[0337] According to one embodiment of the present disclosure, when NR SL and LTE SL coexist in the same resource pool, if NR SL transmission (e.g., PSFCH) overlaps with LTE SL transmission only in time resource region (e.g., FDM) (and / or both time and frequency resource regions overlap), the UE performing NR SL communication may i) omit NR SL transmission, and / or ii) omit NR SL transmission if a received power value (e.g., RSRP measurement value) associated with LTE SL transmission is higher (or lower) than a preconfigured threshold, and / or iii) exclude NR SL candidate transmission resources that perform FDM with LTE SL transmission from resource selection associated with NR SL, and / or iv) exclude NR SL candidate transmission resources that perform FDM with LTE SL transmission from resource selection associated with NR SL if a received power value (e.g., RSRP measurement value) associated with LTE SL transmission is higher (or lower) than a preconfigured threshold and the NR SL transmit power value is higher (or lower) than the preconfigured threshold.

[0338] Fig.12 The situation where NR PSFCH resources overlap with LTE SL resources according to an embodiment of the present disclosure is shown. Fig.11The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0339] Reference Fig.12 , showing NR SL resources, LTE SL resources, and NR PSFCH resources related to the NR SL resources. For example, the resources may be included in the same resource pool. (Alternatively, for example, the resources may not be included in the same resource pool.) Here, when HARQ feedback is sent through the NR PSFCH, since the NR PSFCH resources are related to multiple PSSCH resources, multiple UEs may send multiple HARQ feedbacks related to transmissions performed based on multiple PSSCH resources related to the NR PSFCH resources on the NR PSFCH resources. In this case, AGC saturation may occur in transmission based on LTE SL resources in which an AGC operation was performed at a time point before the NR PSFCH resources. Therefore, as Fig.12 As shown, it is necessary to avoid the situation where NR PSFCH resources and LTE SL resources overlap.

[0340] Therefore, for example, when a UE performing NR SL communication selects specific resources for PSSCH transmission as described above, if the related PSFCH resources are expected to overlap with LTE SL resources, it may i) not perform transmission based on the specific resources, or ii) exclude the specific resources from candidate resources during the transmission resource selection process.

[0341] Alternatively, for example, a UE performing NR SL communication may perform the above i) and ii) operations only when the RSRP value associated with the LTE SL resources is greater than or equal to a specific value to prevent the selection range of NR SL resources from being excessively narrowed.

[0342] According to one embodiment of the present disclosure, when NR SL and LTE SL coexist in the same resource pool (or when they exist in different resource pools), if the priority of NR SL transmission (e.g., PSFCH) is higher than a preconfigured threshold level, it can be configured such that the transmission is performed even if it overlaps with the LTE SL transmission (only in the time resource region and / or in both the time / frequency resource region).

[0343] And / or, for example, when NR SL and LTE SL coexist in the same resource pool, if the priority of NR SL transmission (e.g., PSFCH) is higher than a preconfigured threshold level, even if it overlaps with LTE SL transmission (only in the time resource region and / or in both the time / frequency resource region), if the priority of NR SL transmission (and / or within the preconfigured threshold range) is higher than the preconfigured offset compared to the priority of LTE SL transmission that overlaps with it (only in the time resource region and / or in both the time / frequency resource region), it can be configured to perform its transmission.

[0344] Here, for example, if multiple PSFCH transmissions are to be performed (simultaneously), the highest priority associated with the PSFCH transmission can be used to determine whether the above conditions are met, and if the conditions are met, all multiple PSFCH transmissions can be configured to be performed, that is, for example, PSFCH transmissions that meet the above conditions can be performed together with transmissions that do not meet the conditions.

[0345] And / or, for example, whether the above conditions are met is determined on a per-PSFCH basis, but it can be configured to perform only the PSFCH transmissions that meet the conditions. And / or, for example, it can be configured to perform only the PSFCH transmission with the highest priority among the PSFCH transmissions that meet the conditions. And / or, for example, it can be configured to perform only a preconfigured number of PSFCH transmissions in descending order of priority among the PSFCH transmissions that meet the conditions.

[0346] According to one embodiment of the present disclosure, when NR SL and LTE SL coexist in the same resource pool, (the UE can expect) (by the network) that the start and / or end time points of the NR SL resources (e.g., time slots) are configured to be the same as the start and / or end time points of the LTE SL (e.g., subframes) (even if the same SCS (e.g., 15kHz) is configured).

[0347] According to one embodiment of the present disclosure, it may be configured to perform inter-UE coordination operations between UEs according to (part or all of) the following rules.

[0348] For example, if UE-B is performing a TB transmission with a priority higher (or lower) than that matching a pre-configured preemption application-related threshold level, UE-A may not send a contention indicator (via PSFCH resources).

[0349] According to one embodiment of the present disclosure, LTE SL and NR SL may be configured to operate (coexist) in the same resource pool (and / or channel) according to (part or all of) the following rules.

[0350] For example, RAN1 may be configured to support only 15 kHz and 30 kHz SCS for dynamic resource pool sharing. The existing RAN1 standard for dynamic resource pool sharing may be applied to support 30 kHz.

[0351] For example, for NR PSCCH / PSSCH transmission of 30kHz SCS, the NRSL UE can select at least the first time slot among the NR SL time slots overlapping with the LTE SL subframe at the MAC layer, and then select the NR SL time slot overlapping at the MAC layer.

[0352] For example, the existing rel-16 SL time slot structure can continue to be used.

[0353] For example, it can be considered that the starting symbol of the first time slot among the overlapping NR SL time slots is aligned with the first symbol of the LTE SL subframe.

[0354] For example, for NR SL using 15 / 30kHz SCS, the NR SL UE can avoid resource selection for related PSCCH / PSSCH transmissions if the related PSFCH transmissions overlap with LTE SL reservations in the time domain.

[0355] [Table 20]

[0356]

[0357] [Table 21]

[0358]

[0359]

[0360] [Table 22]

[0361]

[0362] [Table 23]

[0363]

[0364] [Table 24]

[0365]

[0366]

[0367] [Table 25]

[0368]

[0369] [Table 26]

[0370]

[0371] [Table 27]

[0372]

[0373]

[0374] [Table 28]

[0375]

[0376] [Table 29]

[0377]

[0378] [Table 30]

[0379]

[0380] [Table 31]

[0381]

[0382] [Table 32]

[0383]

[0384] [Table 33]

[0385]

[0386] [Table 34]

[0387]

[0388] [Table 35]

[0389]

[0390] [Table 36]

[0391]

[0392] For example, according to an embodiment of the present disclosure, when the PSFCH of the NR SL overlaps with the LTE SL resources, the RSRP threshold applied to the LTE reservation when excluding the time overlapping with the PSFCH can be obtained / configured from the PHY layer. For example, the above exclusion operation can be performed at the MAC layer.

[0393] For example, when considering high SCS processing related determinations, due to the same goal of avoiding automatic gain control (AGC) problems in LTE reception operations, the PHY layer may (in an implementation manner) notify the MAC layer of NR SL (PSSCH) candidate resource information linked to the PSFCH that overlaps with the LTE reservation. For example, the MAC layer that receives the NR SL candidate resource information may perform an elimination operation on the candidate resource set to select the PSCCH / PSSCH resources associated with the overlapping PSFCH.

[0394] For example, if the NR SL (PSSCH) candidate resources linked to the PSFCH overlapping with the LTE reservation are excluded at the PHY layer, at this time, it may be necessary to check whether they exceed the RSRP threshold reserved for LTE (e.g., the (existing) NR SL RSRP threshold or the newly defined RSRP threshold (for this purpose) or the LTE SL RSRP threshold). In other words, based on the principle of high SCS processing, the PHY layer can exclude the NR SL (PSSCH) candidate resources linked to the PSFCH overlapping with the LTE reservation regardless of whether they exceed the RSRP threshold.

[0395] According to one embodiment of the present disclosure, when the PHY layer performs an exclusion operation, even if a situation occurs in which the (per priority) preconfigured minimum value (e.g., X%) of the optional NR SL (PSSCH) candidate resources cannot be met only by RSRP boosting, it may be necessary to report only the remaining optional candidate resources to the MAC layer without restoring (via RSRP boosting) the NR SL (PSSCH) candidate resources linked to the PSFCH overlapping with the LTE reservation.

[0396] Alternatively, for example, when the PHY layer performs an exclusion operation, if a situation occurs where a minimum value (e.g., X%) of a preconfigured proportion (per priority level) of optional NR SL (PSSCH) candidate resources cannot be met by RSRP boost alone, resources randomly selected with equal probability from among the NR SL (PSSCH) candidate resources linked to the PSFCH that overlaps with the LTE reservation may be restored as candidate resources until X% is met.

[0397] Alternatively, for example, when the PHY layer performs an elimination operation, if a situation occurs where a (per-priority) preconfigured minimum value (e.g., X%) of the proportion of optional NR SL (PSSCH) candidate resources cannot be met by RSRP boosting alone, randomly selected resources that are below the (newly defined) RSRP threshold (or the initial RSRP threshold (before applying the RSRP boosting operation)) may be (prioritized) restored as candidate resources (until X%) is met.

[0398] Alternatively, for example, when the PHY layer performs an exclusion operation, if a situation occurs where a minimum value (e.g., X%) of the preconfigured proportion (per priority) of optional NR SL (PSSCH) candidate resources cannot be met by RSRP boost alone, all NR SL (PSSCH) candidate resources linked to the PSFCH that overlaps with the LTE reservation may be restored as candidate resources.

[0399] Alternatively, for example, when the PHY layer performs an exclusion operation, if a situation occurs where a (per-priority) preconfigured minimum value (e.g., X%) of the proportion of optional NR SL (PSSCH) candidate resources cannot be met by RSRP boost alone, the resources implementedly selected by the UE among the NR SL (PSSCH) candidate resources linked to the PSFCH that overlaps with the LTE reservation may be restored as candidate resources (until X%).

[0400] Alternatively, for example, when the PHY layer performs an exclusion operation, if a situation occurs where a minimum value (per priority) pre-configured proportion (e.g., X%) of optional NR SL (PSSCH) candidate resources cannot be met by RSRP improvement alone, NR SL (PSSCH) candidate resources linked to a PSFCH overlapping with an LTE reservation that have a relatively low RSRP measurement value (or below a pre-configured threshold) among the NR SL (PSSCH) candidate resources linked to a PSFCH overlapping with an LTE reservation (and / or overlapping with an LTE reservation with a relatively high priority (or above a pre-configured threshold level)) can be preferentially restored as candidate resources until X% is met.

[0401] According to one embodiment of the present disclosure, when excluding NRPSSCH candidate resources linked to PSFCH overlapping with LTE reservation, after LTE SL RSRP check, LTE SL resources with LTE SL RSRP higher than a threshold may be assumed to be overlapping LTE reserved resources.

[0402] And / or, for example, when excluding NR PSSCH candidate resources linked to PSFCH that overlaps with LTE reservation, after LTE SL RSRP check, if the LTE SL RSRP is higher than the threshold, the LTE SL resources that are higher than the RSRP threshold configured again may be assumed to be overlapping LTE reserved resources.

[0403] And / or, for example, when excluding NR PSSCH candidate resources linked to PSFCH overlapping with LTE reservation, after LTE SL RSRP check, LTE SL resources with LTE SLRSRP higher than the newly configured RSRP threshold may be assumed to be overlapping LTE reserved resources.

[0404] And / or, for example, when NR PSSCH candidate resources linked to PSFCH overlapping with LTE reservation are excluded, the resources detected by LTE SCI decoding can be regarded as LTE reserved resources and NR PSSCH candidate resources linked to PSFCH overlapping therewith are excluded.

[0405] For example, after performing the NRPSSCH candidate resource exclusion operation based on the above rules, it can be configured to form S_A in step 4 of the resource selection process, or the NRPSSCH candidate resource exclusion operation based on the above rules can be applied after step 5 (or step 5A or step 6 or step 6A or step 6B) of the resource selection process.

[0406] For example, when the PHY layer performs the NR PSSCH candidate resource exclusion operation in the above form (when RSRP is increased to meet X% and / or when X% is not met), the NR PSSCH candidate resources linked to the PSFCH overlapping with the LTE reserved resources may not be restored.

[0407] Alternatively, for example, when the PHY layer performs the NRPSSCH candidate resource exclusion operation in the above-described form (when RSRP is increased to meet X% and / or when X% is not met), randomly selected (with equal probability) resources among the excluded resources may be restored (until X% is met).

[0408] Alternatively, for example, when the PHY layer performs an NR PSSCH candidate resource exclusion operation in the above form (when RSRP is increased to meet X% and / or when X% is not met), randomly selected resources among the excluded resources that are lower than the (newly defined) RSRP threshold (or the initial RSRP threshold (before the RSRP increase operation is applied)) may be (prioritized) restored (until X% is met).

[0409] Alternatively, for example, when the PHY layer performs the NR PSSCH candidate resource exclusion operation in the above-mentioned form (when increasing the RSRP to satisfy X% and / or when X% is not satisfied), resources of NR PSSCH candidate resources linked to the PSFCH overlapping with LTE reserved resources having a relatively low (or lower than a preconfigured threshold) RSRP value (and / or a relatively high priority (or higher than a preconfigured threshold level)) may be preferentially restored (until X% is satisfied).

[0410] For example, in the case of LTE-NR coexistence, (when some or all of the above rules are applied) in the NR SL resource selection process, if NRSL is detected only in the second time slot, the resource exclusion operation may also be performed in the first time slot. For example, dynamic co-channel coexistence of LTE SL and NRSL may refer to the coexistence of time and frequency resources shared between NR SL and LTE SL. For example, in the present disclosure, sharing of resource pools may include dynamic co-channel coexistence.

[0411] For example, whether to apply the above rules (and / or parameter values ​​related to the scheme / rules proposed in the present disclosure) can be specifically configured / allowed for at least one of the following elements / parameters (and / or the application of the above rules can be configured / allowed in a restricted manner): service type (and / or (LCH or service) priority, QoS requirements (e.g., latency, reliability, minimum communication range), PQI parameters (and / or (transmission) of LCH / MAC PDU with HQR feedback enabled (and / or disabled), CBR measurement value of resource pool, SL broadcast type (e.g., unicast, multicast, broadcast), SL multicast HARQ feedback options (e.g., NACK feedback only, ACK / NACK feedback, NACK feedback only based on TX-RX distance), SL MODE 1CG type (e.g., SLCH type 1 / 2), SL mode type (e.g., mode 1 / 2), resource pool, whether it is a resource pool configured with PSFCH resources, whether periodic resource reservation operation (and / or aperiodic resource reservation operation) is allowed / configured (or not allowed / not configured) on the resource pool, whether partial sensing operation (and / or random resource selection operation (and / or full sensing operation) is allowed / configured (or not allowed / not configured) on the resource pool, source (L2) ID (and / or destination (L2) ID), PC5 RRC connection link, SL link, connection state (with the base station) (e.g., RRC CONNECTED state, IDLE state, INACTIVE state), SL HARQ process (ID), whether (sending UE or receiving UE) performs SLDRX operation, whether it is an energy-saving (sending or receiving) UE, PSFCH transmission and PSFCH (from the perspective of a specific UE) RX (and / or multiple PSFCH transmissions (exceeding UE capabilities)) overlap (and / or PSFCH transmission (and / or PSFCH reception) is omitted), the receiving UE actually (successfully) receives the inter-UE physical control channel (e.g., PSCCH) (and / or PSSCH) (re)transmission from the transmitting UE, the (transmitting) UE performing packet transmission (and / or transmission resource (re)selection) performs energy saving operation (and / or SLDRX operation), the target (receiving) UE of the transmission packet performs energy saving operation (and / or SLDRX operation), the remaining PDB value associated with the transmission packet is greater than or equal to (or less than or equal to) a preconfigured threshold, the initial transmission (and / or retransmission) (related to TB), the interleaving-based (RB) structure is applied, the (preconfigured) channel access type (e.g., Type 1, Type 2A, Type 2B, Type 2C, semi-static channel occupancy) is performed, the (preconfigured) SL channel / signal (e.g.,SL SSB, PSCCH, PSSCH, PSFCH) transmission / reception situation, RB set (and / or channel, carrier) (performing channel access operation in unlicensed frequency band), channel occupation time (e.g., COT), TX burst and / or discovery burst. In addition, a combination of the proposed schemes (and / or proposed rules and / or implementation methods) described in the present disclosure can be applied. ,

[0412] In addition, the term "configuration" (or "specify") in the present disclosure can be expanded and interpreted as the form in which the base station notifies the UE through a predefined (physical layer or high layer) channel / signal (e.g., SIB, RRC, MAC CE) (and / or through the form of pre-configuration settings, and / or the form in which the UE notifies another UE through a predefined (physical layer or high layer) channel / signal (e.g., SL MAC CE, PC5 RRC)).

[0413] In addition, the term "PSFCH" in the present disclosure may be expanded (to each other) and interpreted as "(NR or LTE) PSSCH (and / or (NR or LTE) PSCCH) (and / or (NR or LTE) SL SSB (and / or UL channel / signal)".

[0414] In addition, the methods proposed in the present disclosure can be combined with each other (in a new form) to expand and use. In addition, in the present disclosure, the term "activity time" (and / or "on duration") can be (each other) expanded and interpreted as "on duration" (and / or "activity time").

[0415] According to one embodiment of the present disclosure, the scheme for determining the contention window size may be a scheme in which multiple schemes are applied in combination. For example, the method may be such a scheme: if there are multiple SL HARQ-ACK feedback groups to be referenced, and if the result determined based on the representative HARQ-ACK value of each group is not to maintain the CWp value for all or each CAPC or to initialize it to the initial value, then the CWp value is incremented to the next allowed value for all or each CAPC.

[0416] For example, if multiple factors referenced when configuring the size of the contention window size change, as a result of the determination of each factor, when the CWp value is incremented to the next allowed value and maintained or initialized to the initial value simultaneously, the CWp value can be maintained and / or the CWp value can be initialized to the minimum value.

[0417] For example, if multiple factors referred to when configuring the contention window size change, as a result of the determination of each factor, the CWp value can be incremented to the next allowed value when the CWp value is incremented to the next allowed value and maintained or initialized to the initial value simultaneously.

[0418] According to one embodiment of the present disclosure, the PSCCH / PSSCH referenced when determining the size of the contention window may be received within a specific time interval. For example, the specific time interval may be within the earliest SL channel occupancy interval from the last time the UE updated its CWp.

[0419] According to one embodiment of the present disclosure, the operation of initializing CWp to the minimum value may be replaced by another specific value (eg, a (pre)configured value), and / or the specific value may be configured differently according to factors controlling the contention window size.

[0420] In various embodiments of the present disclosure, for example, the reference interval may be: i) an interval from the start time point of channel occupancy of the COT occupied by the UE (for sidelink communication) or the COT occupied by the base station (for sidelink communication) to the end time point of the first time slot in which actual specific sidelink transmission is performed in all allocated resources for sidelink transmission, or ii) to the end time point of the first transmission burst including actual specific sidelink transmission for all allocated resources for sidelink transmission, or iii) to an earlier time point between the above endpoints. For example, the specific sidelink transmission may be a PSCCH / PSSCH transmission and / or a PSCCH / PSSCH transmission with SL HARQ-ACK feedback enabled for unicast and / or multicast. For example, when the COT is initialized, the length of the reference interval may be (pre-)configured according to the per-SL priority value of the UE's SL transmission and / or per-resource pool.

[0421] In various embodiments of the present disclosure, for example, different combinations of the above contents may be used depending on whether the channel occupancy duration (eg, COT duration) is initiated by the UE or the base station.

[0422] In various embodiments of the present disclosure, for example, the operation of adjusting the contention window size for the side link can be performed for each unicast session (group) and / or each broadcast type and / or each transmission priority value and / or each SL transmission with SL HARQ-ACK feedback enabled / disabled and / or each SL HARQ-ACK feedback option. For example, the process of adjusting the size of the contention window can be performed for SL transmissions from a first UE to a second UE and for SL transmissions from a third UE to a fourth UE, respectively. For example, when the contention window size is adjusted based on HARQ-ACK, HARQ-ACK can be limited to a specific broadcast type and / or a specific unicast session.

[0423] In various embodiments of the present disclosure, for example, the operation of adjusting the contention window size for the side link may be performed only based on a specific broadcast type (eg, unicast or groupcast) and / or a PSSCH with SL HARQ-ACK feedback enabled.

[0424] In various embodiments of the present disclosure, for example, an operation of initializing the value of CW_p to the respective minimum value may be applied by replacing it with an operation of decreasing the value of CW_p to the previous allowed value.

[0425] For example, in TYPE 1SL channel access, the contention window size may be (pre)configured per priority class and / or per SL priority and / or per resource pool. For example, in the above case, the UE may not perform any operation to individually adjust the contention window size.

[0426] In various embodiments of the present disclosure, for example, in a channel sensing operation based on a channel access type, the threshold for determining whether a channel is busy or idle may be (pre)configured, and / or predefined per resource pool and / or per SL BWP and / or per RB set and / or per carrier and / or per SL transmission priority and / or per representative transmit power value (range) and / or per congestion control level.

[0427] Various embodiments of the present disclosure may be applied in the form of any combination described above, for example, according to transmissions within or outside the COT. Various embodiments of the present disclosure may be applied in the form of any combination described above, for example, according to the form of the COT (e.g., whether it is semi-static or time-varying). For example, within a semi-static COT, it may be ensured, such as by regulation, that no other technology shares the same channel or RB set within a specific time period. For example, within a semi-static COT, for SL transmissions, it may be ensured, such as by regulation, that no base station to UE and / or UE to base station transmissions (e.g., DL and / or UL transmissions) sharing the same channel or RB set within a specific time period. For example, within a semi-static COT, for base station to UE and / or base station to UE transmissions (e.g., DL and / or UL transmissions), it may be ensured, such as by regulation, that no SL transmissions sharing the same channel or RB set within a specific time period. For example, within a semi-static COT, it may be ensured, such as by regulation, that no SL mode 2 resource (re)selection based on SL transmissions sharing the same channel or RB set within a specific time period.

[0428] For example, the length and / or time axis offset value of the fixed frame period (FFP) for the semi-static channel occupancy time duration (e.g., COT duration) can be (pre) configured per resource pool and / or per SL BWP and / or per carrier and / or per RB set and / or per congestion control level and / or per SL transmission priority value. For example, the length and / or time axis offset value of the fixed frame period (FFP) for the semi-static channel occupancy time duration (e.g., COT duration) can be configured via PC5-RRC signaling between UEs. For example, the FFP (pre) configured via PC5-RRC signaling can be overwritten. For example, the FFP configured via PC5-RRC can be limited to unicast transmission corresponding to the PC5-RRC connection. Various embodiments of the present disclosure can be applied in different forms of the above combinations according to the carrier, or according to whether there is protection between RB sets and according to regulations.

[0429] Although it is described in various embodiments of the present disclosure that the contention window size is changed for all CAPCs, the concept of the present disclosure may be extended and applied in the form of changing the contention window size for a specific CAPC or SL priority value.

[0430] In various embodiments of the present disclosure, for example, with respect to the channel access type and whether / how to indicate, the above scheme may be applied differently per SL channel. In various embodiments of the present disclosure, for example, with respect to the channel access type and whether / how to indicate, the above scheme may be applied differently depending on the type of information included in the SL channel.

[0431] For example, the proposed method can be applied to the apparatus described below. First, the processor 202 of the receiving UE can establish at least one BWP; and the processor 202 of the receiving UE can control the transceiver 206 of the receiving UE to receive the sidelink-related physical channel and / or the sidelink-related reference signal from the transmitting UE through the at least one BWP.

[0432] For example, if the RSRP of the LTE resources reserved by another device is greater than or equal to a threshold, the NR PSSCH resources can be selected so that the relevant PSFCH opportunity does not overlap with the LTE resources in time. For example, under dynamic resource pool sharing operation, the NRSL module (or device) can be configured to only consider the LTE SL reserved resources that exceed the preconfigured LTE SL RSRP threshold when determining (in resource selection step 5) the overlap in the time domain with the PSFCH transmission opportunity linked to the NR SL candidate resources. Here, the overlap in the time domain may include the PSFCH resources linked to the NR SL candidate resources and the LTE SL reserved resources being FDM at the same time point, or part / all of the relevant frequency resource areas overlapping at the same time point. For example, under dynamic resource pool sharing operation, if the NR SL SCS is greater than the LTE SL SCS (for example, the SCS of the NR SL is 30KHZ), the transmit power value on the first NR SL time slot that overlaps with the LTE SL subframe can be greater than or equal to the transmit power value on the second NR SL time slot.

[0433] Fig.13 A process in which a first device performs wireless communication according to an embodiment of the present disclosure is shown. Fig.13 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0434] Reference Fig.13 In step S1310, the first device may obtain information of a long term evolution (LTE) side link (SL) resource reserved for the second device. In step S1320, the first device may obtain a SL reference signal received power (RSRP) value associated with the LTE SL resource. In step S1330, based on the SL RSRP value exceeding a first threshold, the first device may select a first new radio (NR) SL resource whose related physical side link feedback channel (PSFCH) transmission timing does not overlap with the LTE SL resource in the time domain.

[0435] For example, in addition, based on the SL RSRP value exceeding the first threshold, the first device can exclude resources whose related PSFCH transmission timing overlaps with LTE SL resources in the time domain from the candidate resource set used to select the first NR SL resource.

[0436] For example, resources whose related PSFCH transmission opportunities overlap with LTE SL resources in the time domain may overlap with LTE SL resources in both the time domain and the frequency domain.

[0437] For example, resources whose related PSFCH transmission opportunities overlap with LTE SL resources in the time domain may not overlap with LTE SL resources in the frequency domain.

[0438] For example, in addition, based on the ratio of the candidate resource set to the total resources in the selection window being less than a threshold ratio, the first device may restore at least one resource among the resources excluded from the candidate resource set to the candidate resource set.

[0439] For example, resources whose related PSFCH transmission opportunities overlap with LTE SL resources in the time domain may not be included in the recovered resources.

[0440] For example, the restored resources may be randomly selected from among the excluded resources.

[0441] For example, the recovered resource may be a resource whose associated PSFCH transmission timing overlaps with the LTE SL resource in the time domain, the SL RSRP value is less than the second threshold, and the second threshold is greater than the first threshold.

[0442] For example, the recovered resources may be resources whose related PSFCH transmission opportunities overlap with LTE SL resources in the time domain, and whose priority associated with a medium access control (MAC) protocol data unit (PDU) sent through the LTE SL resources is higher than a threshold priority.

[0443] For example, the first threshold may be preconfigured.

[0444] For example, based on the LTE SL resource overlapping with the first NR SL resource and the second NR SL resource after the first NR SL resource in the time domain, the first transmit power associated with the first NR SL resource may be greater than or equal to the second transmit power associated with the second NR SL resource.

[0445] For example, the starting time point of the first NR SL resource can be aligned with the starting time point of the LTE SL resource.

[0446] For example, a first subcarrier spacing (SCS) associated with an LTE SL resource may be 15 kHz, and a second SCS associated with a first NR SL resource and a second NR SL resource may be 30 kHz.

[0447] The above-mentioned embodiments can be applied to various devices described below. First, the processor 102 of the first device 100 can obtain information about the long-term evolution (LTE) side link (SL) resources reserved for the second device 200. And, the processor 102 of the first device 100 can obtain a SL reference signal received power (RSRP) value related to the LTE SL resource. And, based on the SLRSRP value exceeding the first threshold, the processor 102 of the first device 100 can select a first new radio (NR) SL resource whose related physical side link feedback channel (PSFCH) transmission timing does not overlap with the LTE SL resource in the time domain.

[0448] According to one embodiment of the present disclosure, a first device for performing wireless communication may be proposed. For example, the first device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, which, when executed by the at least one processor, cause the first device to perform operations. For example, the operations may include: obtaining information about long term evolution (LTE) side link (SL) resources reserved for a second device; obtaining a SL reference signal received power (RSRP) value associated with the LTE SL resources; and selecting a first new radio (NR) SL resource whose related physical side link feedback channel (PSFCH) transmission timing does not overlap with the LTE SL resources in the time domain based on the SL RSRP value exceeding a first threshold.

[0449] For example, in addition, these operations may also include: based on the SLRSRP value exceeding the first threshold, excluding resources whose related PSFCH transmission timing overlaps with LTE SL resources in the time domain from the candidate resource set used to select the first NR SL resource.

[0450] For example, resources whose related PSFCH transmission opportunities overlap with LTE SL resources in the time domain may overlap with LTE SL resources in both the time domain and the frequency domain.

[0451] For example, resources whose related PSFCH transmission opportunities overlap with LTE SL resources in the time domain may not overlap with LTE SL resources in the frequency domain.

[0452] For example, in addition, these operations may further include: based on the ratio of the candidate resource set to the total resources in the selection window being less than a threshold ratio, restoring at least one resource excluded from the candidate resource set to the candidate resource set.

[0453] For example, resources whose related PSFCH transmission opportunities overlap with LTE SL resources in the time domain may not be included in the recovered resources.

[0454] For example, the restored resources may be randomly selected from the excluded resources.

[0455] For example, the recovered resources may be resources whose related PSFCH transmission timing overlaps with LTE SL resources in the time domain, the SLRSRP value may be less than the second threshold, and the second threshold may be greater than the first threshold.

[0456] For example, the recovered resources may be resources whose related PSFCH transmission opportunities overlap with LTE SL resources in the time domain, and whose priority associated with a medium access control (MAC) protocol data unit (PDU) sent through the LTE SL resources is higher than a threshold priority.

[0457] For example, the first threshold may be preconfigured.

[0458] For example, based on the LTE SL resource overlapping with the first NR SL resource and the second NR SL resource after the first NR SL resource in the time domain, the first transmit power associated with the first NR SL resource may be greater than or equal to the second transmit power associated with the second NR SL resource.

[0459] For example, the starting time point of the first NR SL resource can be aligned with the starting time point of the LTE SL resource.

[0460] For example, a first subcarrier spacing (SCS) associated with an LTE SL resource may be 15 kHz, and a second SCS associated with a first NR SL resource and a second NR SL resource may be 30 kHz.

[0461] According to an embodiment of the present disclosure, a device suitable for controlling a first user equipment (UE) may be proposed. For example, the device may include: at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, which, when executed by the at least one processor, cause the first UE to perform operations. For example, the operations may include: obtaining information about long term evolution (LTE) side link (SL) resources reserved for a second device; obtaining a SL reference signal received power (RSRP) value associated with the LTE SL resources; and selecting a first new radio (NR) SL resource whose related physical side link feedback channel (PSFCH) transmission timing does not overlap with the LTE SL resources in the time domain based on the SL RSRP value exceeding a first threshold.

[0462] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions may enable a first device to: obtain information of a long-term evolution (LTE) side link (SL) resource reserved for a second device based on being executed; obtain a SL reference signal received power (RSRP) value related to the LTE SL resource; and select a first new radio (NR) SL resource whose related physical side link feedback channel (PSFCH) transmission timing does not overlap with the LTE SL resource in the time domain based on the SL RSRP value exceeding a first threshold.

[0463] Fig.14 A process of a second device performing wireless communication according to an embodiment of the present disclosure is shown. Fig.14 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0464] Reference Fig.14In step S1410, the second device may receive sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) from the first device through a physical sidelink control channel (PSCCH) based on a first new radio (NR) SL resource. In step S1420, the second device may receive a medium access control (MAC) protocol data unit (PDU) from the first device through the PSSCH based on the first NR SL resource. For example, a physical sidelink feedback channel (PSFCH) transmission timing associated with the first NR SL resource may not overlap with a long term evolution (LTE) SL resource in the time domain, and the first NR SL resource may be selected based on an SL reference signal received power (RSRP) value associated with the LTE SL resource exceeding a first threshold.

[0465] For example, based on the SL RSRP value exceeding the first threshold, it is not allowed to select a resource whose related PSFCH transmission timing overlaps with the LTE SL resource in the time domain as the first NR SL resource.

[0466] The above-mentioned embodiments can be applied to various devices described below. First, the processor 202 of the second device 200 can control the transceiver 206 to receive side link control information (SCI) for scheduling a physical side link shared channel (PSSCH) from the first device 100 through a physical side link control channel (PSCCH) based on a first new radio (NR) SL resource. And, the processor 202 of the second device 200 can control the transceiver 206 to receive a medium access control (MAC) protocol data unit (PDU) from the first device 100 through the PSSCH based on the first NR SL resource. For example, the physical side link feedback channel (PSFCH) transmission timing associated with the first NR SL resource does not overlap with the long-term evolution (LTE) SL resource in the time domain, and the first NR SL resource is selected based on the SL reference signal received power (RSRP) value associated with the LTE SL resource exceeding a first threshold.

[0467] According to an embodiment of the present disclosure, a second device for performing wireless communication may be proposed. For example, the second device may include: at least one transceiver; at least one processor; and at least one memory operatively connected to at least one processor and storing instructions, which, when executed by at least one processor, cause the second device to perform operations. For example, the operations may include: receiving sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) from a first device via a physical sidelink control channel (PSCCH) based on a first new radio (NR) SL resource; and receiving a medium access control (MAC) protocol data unit (PDU) from a first device via the PSSCH based on the first NRSL resource, wherein a physical sidelink feedback channel (PSFCH) transmission timing associated with the first NRSL resource does not overlap with a long term evolution (LTE) SL resource in the time domain, and the first NR SL resource is selected based on a SL reference signal received power (RSRP) value associated with the LTE SL resource exceeding a first threshold.

[0468] For example, based on the SLRSRP value exceeding the first threshold, it is not allowed to select resources whose related PSFCH transmission timing overlaps with LTE SL resources in the time domain as the first NR SL resources.

[0469] Various embodiments of the present disclosure may be combined with each other.

[0470] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0471] The various descriptions, functions, processes, proposals, methods and / or operational flows of the present disclosure described in this document may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0472] Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise described, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0473] Fig.15 A communication system 1 according to an embodiment of the present disclosure is shown. Fig.15 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0474] Reference Fig.15, a communication system 1 to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot 100a, a vehicle (100b-1, 100b-2), an extended reality (XR) device (100c), a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of head mounted devices (HMD), head up displays (HUD) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device (200a) may operate as a BS / network node relative to other wireless devices.

[0475] Here, in addition to LTE, NR and 6G, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may also include a narrowband Internet of Things for low-power communication. In this case, for example, 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 technology implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on LTE-M technology. In this case, as an example, LTE-M technology may be an example of LPWAN, and may be referred to as various names including enhanced machine type communication (eMTC), etc. For example, 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 technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, a low power wide area network (LPWAN), and ZigBee considering low power communication, and is not limited to the above names. As an example, the ZigBee technology may generate a personal area network (PAN) related to small / low power digital communication based on various standards including IEEE 802.15.4, etc., and may be referred to as various names.

[0476] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0477] Wireless communication / connection 150a, 150b or 150c can be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. Here, the wireless communication / connection can be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b can send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation and resource mapping / demapping) and at least a portion of the resource allocation process can be performed based on various proposals of the present disclosure.

[0478] Fig.16 A wireless device according to an embodiment of the present disclosure is shown. Fig.16 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0479] Reference Fig.16 , the first wireless device 100 and the second wireless device 200 may transmit radio signals through various RATs (e.g., LTE and NR). Herein, {the first wireless device 100 and the second wireless device 200} may correspond to Fig.15 {wireless device 100x and BS200} and / or {wireless device 100x and wireless device 100x} in.

[0480] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and / or one or more antennas (antenna units) 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then send a radio signal including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive a radio signal including second information / signals through the transceiver 106, and then store the information obtained by processing the second information / signals in the (one or more) memories 104. The (one or more) memories 104 may be connected to the (one or more) processors 102, and may store various information related to the operation of the (one or more) processors 102. For example, (one or more) memories 104 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 102 or for executing the descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document. Here, (one or more) processors 102 and (one or more) memories 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceivers 106 may be connected to (one or more) processors 102 and send and / or receive radio signals through (one or more) antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. (One or more) transceivers 106 may be used interchangeably with (one or more) radio frequency (RF) units. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0481] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally further include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive a radio signal including a fourth information / signal through the (one or more) transceivers 106, and then store the information obtained by processing the fourth information / signals in the (one or more) memories 204. 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, (one or more) memories 204 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 202 or for executing the descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document. Here, (one or more) processors 202 and (one or more) memories 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceivers 206 may be connected to (one or more) processors 202 and transmit and / or receive radio signals through (one or more) antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. (One or more) transceivers 206 may be used interchangeably with (one or more) RF units. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0482] Below, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow 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 description, function, process, proposal, method, and / or operation flow disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 can 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, processes, proposals, methods, and / or operating procedures disclosed in this document.

[0483] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, thereby being driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0484] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cash memory, computer-readable storage media, 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 via various technologies such as wired or wireless connections.

[0485] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the method and / or operation flow of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the description, function, process, proposal, method, and / or operation flow disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202, and may send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation flows disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0486] Fig.17 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown. Fig.17 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0487] Reference Fig.17 The signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Fig.17 Operation / function, not limited to Fig.16 The processor (102, 202) and / or transceiver (106, 206) of Fig.16 The processor (102, 202) and / or the transceiver (106, 206) are implemented Fig.17 For example, you can Fig.16 The processor (102, 202) implements blocks 1010 to 1060. Alternatively, Fig.16 The processor (102, 202) implements blocks 1010 to 1050 and can be implemented by Fig.16 The transceiver (106, 206) is used to implement box 1060.

[0488] Can be through Fig.17 The signal processing circuit 1000 converts the codeword into a radio signal. Herein, the codeword is a coded bit sequence of an information block. The information block may include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0489] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK) and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbol of each transmission layer can be mapped (precoded) to (one or more) corresponding antenna ports by the precoder 1040. The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 with the N*M precoding matrix W. Here, N is the number of antenna ports and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) for the complex modulation symbol. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0490] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include multiple symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and multiple subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be sent to other devices through each antenna. To this end, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0491] Can be used with Fig.17 The signal processing process for the signal received in the wireless device is configured in a manner opposite to the signal processing process (1010-1060) of the wireless device. Fig.16 100, 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal can be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword can be restored to the original information block by decoding. Therefore, a signal processing circuit (not illustrated) for receiving a signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0492] Fig.18 Another example of a wireless device according to an embodiment of the present disclosure is shown. The wireless device can be implemented in various forms according to use cases / services (see Fig.15 ). Fig.18 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0493] Reference Fig.18 , the wireless device (100, 200) may correspond to Fig.16 The wireless devices (100, 200) may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and (one or more) transceivers 114. For example, the communication circuit 112 may include Fig.16 One or more processors (102, 202) and / or one or more memories (104, 204) of the present invention. For example, the transceiver(s) 114 may include Fig.16The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. The control unit 120 can send the information stored in the memory 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 memory unit 130.

[0494] The additional component 140 may be configured in various ways depending on the type of the wireless device. For example, the additional component 140 may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be implemented in the following forms without limitation: a robot ( Fig.15 100a), vehicles ( Fig.15 100b-1 and 100b-2), XR devices ( Fig.15 100c), handheld device ( Fig.15 100d), household appliances ( Fig.15 100e), IoT devices ( Fig.15 100f), digital broadcast terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Fig.15 400), BS( Fig.15 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0495] exist Fig.18In the wireless device (100, 200), all the various elements, components, units / parts and / or modules in the wireless device (100, 200) can be connected to each other through a wired interface, or at least part of them can be connected wirelessly through the communication unit 110. For example, in each of the wireless devices (100, 200), the control unit 120 and the communication unit 110 can be connected by wire, and the control unit 120 and the first unit (e.g., 130, 140) can be connected wirelessly through the communication unit 110. Each element, component, unit / part and / or module in the wireless device (100, 200) can also include one or more elements. For example, the control unit 120 can be constructed by a set of one or more processors. As an example, the control unit 120 can be constructed by a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory 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.

[0496] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig.18 .

[0497] Fig.19 A handheld device based on an embodiment of the present disclosure is shown. The handheld device may include a smart phone, a smart board, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT). Fig.19 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0498] Reference Fig.19 , the handheld device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an I / O unit 140c. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to Fig.18 Frame 110 to 130 / 140.

[0499] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the handheld device 100. The control unit 120 may include an application processor (AP). The memory unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. The memory unit 130 may store input / output data / information. The power supply unit 140a may supply power to the handheld device 100 and include a wired / wireless charging circuit, a battery, etc. The interface unit 140b may support the connection of the handheld device 100 to other external devices. The interface unit 140b may include various ports (e.g., audio I / O ports and video I / O ports) for connecting to external devices. The I / O unit 140c may input or output video information / signals, audio information / signals, data and / or information input by a user. The I / O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker and / or a tactile module.

[0500] For example, in the case of data communication, the I / O unit 140c can obtain information / signals (e.g., touch, text, voice, image, or video) input by the user, and the obtained information / signals can be stored in the memory unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals, and directly send the converted radio signals to other wireless devices or to the BS. The communication unit 110 can receive radio signals from other wireless devices or BSs, and then restore the received radio signals to the original information / signals. The restored information / signals can be stored in the memory unit 130, and can be output as various types (e.g., text, voice, image, video, or tactile) through the I / O unit 140.

[0501] Fig. 20 A vehicle or autonomous vehicle based on an embodiment of the present disclosure is shown. The vehicle or autonomous vehicle can be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc. Fig. 20 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0502] Reference Fig. 20 , the vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Fig.18 Frame 110 / 130 / 140.

[0503] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may cause the vehicle or autonomous vehicle 100 to travel on the road. The drive unit 140a may include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100, and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire vehicle status, external environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse 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 may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path when a destination is set, and the like.

[0504] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically acquire the most recent traffic information data from an external server and acquire surrounding traffic information data from adjacent vehicles. In the middle of autonomous driving, the sensor unit 140c may acquire vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly acquired data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving path, and / or driving plan to an external server. The external server may predict traffic information data using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0505] The claims in this specification may be combined in various ways. For example, the technical features in the method claims of this specification may be combined to be implemented or performed in a device, and the technical features in the device claims may be combined to be implemented or performed in a method. In addition, the technical features in (one or more) method claims and (one or more) device claims may be combined to be implemented or performed in a device. In addition, the technical features in (one or more) method claims and (one or more) device claims may be combined to be implemented or performed in a method.

Claims

1. A method for performing wireless communication by a first device, the method comprising the following steps: Obtaining information of Long Term Evolution (LTE) side link (SL) resources reserved for the second device; Obtaining a SL reference signal received power RSRP value associated with the LTE SL resource; and Based on the SL RSRP value exceeding a first threshold, a first new radio NR SL resource is selected whose related physical side link feedback channel PSFCH transmission timing does not overlap with the LTE SL resource in the time domain.

2. The method according to claim 1, further comprising the steps of: Based on the SL RSRP value exceeding the first threshold, resources whose related PSFCH transmission timing overlaps with the LTE SL resources in the time domain are excluded from a candidate resource set used to select the first NR SL resource.

3. The method according to claim 2, wherein: The resources whose related PSFCH transmission opportunities overlap with the LTE SL resources in the time domain overlap with the LTE SL resources in the time domain and the frequency domain.

4. The method according to claim 2, wherein: The resources whose related PSFCH transmission opportunities overlap with the LTE SL resources in the time domain do not overlap with the LTE SL resources in the frequency domain.

5. The method according to claim 2, further comprising the steps of: Based on the ratio of the candidate resource set to the total resources in the selection window being less than a threshold ratio, at least one resource among the resources excluded from the candidate resource set is restored to the candidate resource set.

6. The method according to claim 5, wherein: The resources whose related PSFCH transmission opportunities overlap with the LTE SL resources in the time domain are not included in the recovered resources.

7. The method according to claim 5, wherein: The restored resources are randomly selected from the excluded resources.

8. The method according to claim 5, wherein: The recovered resources are the resources whose related PSFCH transmission opportunities overlap with the LTE SL resources in the time domain, The SL RSRP value is less than a second threshold, and The second threshold is greater than the first threshold.

9. The method according to claim 5, wherein: The recovered resources are the resources whose related PSFCH transmission opportunities overlap with the LTE SL resources in the time domain, and The priority level associated with a medium access control MAC protocol data unit PDU to be sent via the LTE SL resources is higher than a threshold priority level.

10. The method according to claim 1, wherein: The first threshold is preconfigured.

11. The method according to claim 1, wherein: Based on the fact that the LTE SL resource overlaps with the first NR SL resource and the second NR SL resource after the first NR SL resource in the time domain, a first transmit power associated with the first NR SL resource is greater than or equal to a second transmit power associated with the second NR SL resource.

12. The method according to claim 11, wherein: The starting time point of the first NR SL resource is aligned with the starting time point of the LTE SL resource.

13. The method according to claim 11, wherein: A first subcarrier spacing SCS associated with the LTE SL resource is 15 kHz, and Among them, the second SCS associated with the first NR SL resource and the second NR SL resource is 30kHz.

14. A first device for performing wireless communication, the first device comprising: at least one transceiver; at least one processor; as well as at least one memory operatively connected to the at least one processor and storing instructions that, upon execution by the at least one processor, cause the first device to perform operations, The operations include: Obtaining information of Long Term Evolution (LTE) side link (SL) resources reserved for the second device; Obtaining a SL reference signal received power RSRP value associated with the LTE SL resource; and Based on the SL RSRP value exceeding a first threshold, a first new radio NR SL resource is selected whose related physical side link feedback channel PSFCH transmission timing does not overlap with the LTE SL resource in the time domain.

15. An apparatus adapted to control a first user equipment UE, the apparatus comprising: at least one processor; as well as at least one memory operatively connected to the at least one processor and storing instructions that, upon execution by the at least one processor, cause the first UE to perform operations, The operations include: Obtaining information of Long Term Evolution (LTE) side link (SL) resources reserved for the second device; Obtaining a SL reference signal received power RSRP value associated with the LTE SL resource; and Based on the SL RSRP value exceeding a first threshold, a first new radio NR SL resource is selected whose related physical side link feedback channel PSFCH transmission timing does not overlap with the LTE SL resource in the time domain.

16. A non-transitory computer-readable storage medium storing instructions that upon being executed cause a first device to: Obtaining information of Long Term Evolution (LTE) side link (SL) resources reserved for the second device; Obtaining a SL reference signal received power RSRP value associated with the LTE SL resource; and Based on the SL RSRP value exceeding a first threshold, a first new radio NR SL resource is selected whose related physical side link feedback channel PSFCH transmission timing does not overlap with the LTE SL resource in the time domain.

17. A method for performing wireless communication by a second device, the method comprising the following steps: receiving sidelink control information SCI for scheduling a physical sidelink shared channel PSSCH from the first device through a physical sidelink control channel PSCCH based on the first new radio NR SL resource; and receiving a medium access control MAC protocol data unit PDU from the first device through the PSSCH based on the first NR SL resource, wherein a physical side link feedback channel PSFCH transmission opportunity associated with the first NR SL resource does not overlap with a long term evolution LTE SL resource in the time domain, and The first NR SL resource is selected based on the SL reference signal received power RSRP value associated with the LTE SL resource exceeding a first threshold.

18. The method according to claim 17, wherein: Based on the SL RSRP value exceeding the first threshold, it is not allowed to select a resource whose related PSFCH transmission timing overlaps with the LTE SL resource in the time domain as the first NR SL resource.

19. A second device for performing wireless communication, the second device comprising: at least one transceiver; at least one processor; as well as at least one memory operatively connected to the at least one processor and storing instructions that, upon execution by the at least one processor, cause the second device to perform operations, The operations include: receiving sidelink control information SCI for scheduling a physical sidelink shared channel PSSCH from the first device through a physical sidelink control channel PSCCH based on the first new radio NR SL resource; and receiving a medium access control MAC protocol data unit PDU from the first device through the PSSCH based on the first NR SL resource, wherein a physical side link feedback channel PSFCH transmission opportunity associated with the first NR SL resource does not overlap with a long term evolution LTE SL resource in the time domain, and The first NR SL resource is selected based on the SL reference signal received power RSRP value associated with the LTE SL resource exceeding a first threshold.

20. The second device according to claim 19, wherein: Based on the SL RSRP value exceeding the first threshold, it is not allowed to select a resource whose related PSFCH transmission timing overlaps with the LTE SL resource in the time domain as the first NR SL resource.

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