Method and apparatus for selecting nr sidelink resources in unlicensed band

Abstract

A method of operating a first device (100) in a wireless communication system is presented. The method may comprise the steps of: triggering resource selection in a time slot; determining a time interval based on the remaining PDBs in the time slot based on the triggering of resource selection; selecting a resource for SL transmission within the time interval based on the sensing; and performing the channel sensing only within an interval preceding the channel sensing interval starting from the starting time point of the resource, in which the result of the channel sensing is busy and the result of the channel sensing is communicated from the PHY layer of the first device (100) to the MAC layer of the first device (100).

Description

Technical Field

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

[0002] Sidelink (SL) communication is a communication scheme in which a direct link is established between User Equipment (UE) and UEs exchange voice and data directly with each other without the intervention of evolved Node B (eNB). SL communication is being considered as a solution to the eNB overhead caused by the rapid growth of data traffic. Vehicle-to-Everything (V2X) refers to the communication technology used by vehicles to exchange information with other vehicles, pedestrians, and entities with established infrastructure (or infra). V2X can be expanded into four types such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). V2X communication can be provided through the PC5 interface and / or the Uu interface.

[0003] In addition, since a wider range of communication devices requires greater communication capacity, the need for more enhanced mobile broadband communications than existing radio access technologies (RATs) is rising. Therefore, discussions on services and user equipment (UE) that are sensitive to reliability and latency are being conducted. And, 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). Vehicle-to-everything (V2X) communications may also be supported in NRs. Summary of the invention

[0004] Technical Solution

[0005] According to an embodiment of the present disclosure, a method for performing wireless communication by a first device may be proposed. For example, the method may include: triggering resource selection at a time slot; based on the triggering of resource selection, determining a time interval based on a remaining packet delay budget (PDB) from the time slot; selecting a resource for side link (SL) transmission within the time interval based on sensing; and performing channel sensing within an interval before a starting time point of the resource according to a channel sensing interval. For example, the result of the channel sensing may be busy, and the result of the channel sensing may be delivered from a physical (PHY) layer of the first device to a medium access control (MAC) layer of the first device.

[0006] According to an embodiment of the present disclosure, a first device for performing wireless communication may be proposed. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors, the one or more processors being connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: trigger resource selection at a time slot; based on the triggering of resource selection, determine a time interval based on the remaining packet delay budget (PDB) from the time slot; select resources for side link (SL) transmission within the time interval based on sensing; and perform channel sensing within the interval before the starting time point of the resource according to the channel sensing interval, wherein the result of the channel sensing may be busy, and wherein the result of the channel sensing may be delivered from the physical (PHY) layer of the first device to the medium access control (MAC) layer of the first device.

[0007] 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: one or more processors; and one or more memories, the one or more memories being operably connected to the one or more processors and storing instructions. For example, the one or more processors may execute instructions to: trigger resource selection at a time slot; based on the triggering of resource selection, determine a time interval based on the remaining packet delay budget (PDB) from the time slot; select resources for side link (SL) transmission within the time interval based on sensing; and perform channel sensing within an interval before the starting time point of the resource according to the channel sensing interval, wherein the result of the channel sensing may be busy, and wherein the result of the channel sensing may be delivered from the physical (PHY) layer of the first UE to the medium access control (MAC) layer of the first UE.

[0008] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be proposed. For example, when the instructions are executed, the first device may: trigger resource selection at a time slot; determine a time interval based on a remaining packet delay budget (PDB) from the time slot based on the triggering of resource selection; select a resource for side link (SL) transmission within the time interval based on sensing; and perform channel sensing within an interval before the starting time point of the resource according to the channel sensing interval, wherein the result of the channel sensing may be busy, and wherein the result of the channel sensing may be delivered from the physical (PHY) layer of the first device to the medium access control (MAC) layer of the first device.

[0009] According to an embodiment of the present disclosure, a method for performing wireless communication by a second device may be proposed. For example, the method may include: based on reselecting resources, receiving side link control information (SCI) including information related to the reselected resources from the first device; and performing side link (SL) reception based on the reselected resources. For example, the reselected resources may be reselected from the resources based on a trigger for resource reselection, the resource reselection may be triggered from the medium access control (MAC) layer of the first device based on the result of channel sensing being busy, the result of channel sensing may be delivered from the physical (PHY) layer of the first device to the MAC layer of the first device, the resources may be selected within a time interval based on sensing, and the time interval may be determined based on a trigger for resource selection triggered at a time slot, based on the remaining packet delay budget (PDB) from the time slot.

[0010] 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: one or more memories storing instructions; one or more transceivers; and one or more processors, the one or more processors being connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: based on reselecting resources, receive side link control information (SCI) including information related to reselecting resources from a first device; and perform side link (SL) reception based on reselecting resources, wherein the reselected resources may be reselected from resources based on a trigger for resource reselection, wherein resource reselection may be triggered from a medium access control (MAC) layer of the first device based on the result of channel sensing being busy, wherein the result of channel sensing may be delivered from a physical (PHY) layer of the first device to a MAC layer of the first device, wherein resources may be selected within a time interval based on sensing, and the time interval may be determined based on a trigger for resource selection triggered at a time slot, based on a remaining packet delay budget (PDB) from the time slot.

[0011] Beneficial effects

[0012] The user equipment (UE) can efficiently perform SL communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The structure of the NR system based on the embodiment of the present disclosure is shown.

[0014] Figure 2 A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0015] Figure 3 The structure of a radio frame of NR based on an embodiment of the present disclosure is shown.

[0016] Figure 4 The structure of the time slot of the NR frame based on the embodiment of the present disclosure is shown.

[0017] Figure 5 An example of a BWP based on an embodiment of the present disclosure is shown.

[0018] Figure 6 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.

[0019] Figure 7 Three broadcast types are shown according to embodiments of the present disclosure.

[0020] Figure 8 An example of a wireless communication system supporting a license-free band according to an embodiment of the present disclosure is shown.

[0021] Fig. 9 A method for occupying resources in an unlicensed frequency band according to an embodiment of the present disclosure is shown.

[0022] Fig.10 A case where a plurality of LBT-SBs are included in a license-exempt band according to an embodiment of the present disclosure is shown.

[0023] Fig.11 A CAP operation of transmitting a downlink signal through an unlicensed frequency band performed by a base station according to an embodiment of the present disclosure is shown.

[0024] Fig.12 A Type 1 CAP operation of transmitting an uplink signal performed by a UE according to an embodiment of the present disclosure is shown.

[0025] Fig.13 A process in which a medium access control (MAC) layer of a first device triggers resource reselection based on a failure of channel sensing according to an embodiment of the present disclosure is shown.

[0026] Fig.14 A process in which a PHY layer of a first device reports a failure of a channel sensing operation to a MAC layer of the first device according to an embodiment of the present disclosure is shown.

[0027] Fig.15 A process in which a first device performs wireless communication according to an embodiment of the present disclosure is shown.

[0028] Fig.16 A process in which a second device performs wireless communication according to an embodiment of the present disclosure is shown.

[0029] Fig.17 A communication system 1 according to an embodiment of the present disclosure is shown.

[0030] Fig.18 A wireless device according to an embodiment of the present disclosure is shown.

[0031] Fig.19 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0032] Fig. 20 Another example of a wireless device according to an embodiment of the present disclosure is shown.

[0033] Fig.21 A handheld device according to an embodiment of the present disclosure is shown.

[0034] Fig. 22 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0035] 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".

[0036] 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".

[0037] 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".

[0038] 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".

[0039] 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 "PDCCH" may be proposed as an example of "control information". In addition, when indicated as "control information (i.e., PDCCH)", this may also mean proposing "PDCCH" as an example of "control information".

[0040] In the following description, "when, if, or in the event of..." can be replaced with "based on".

[0041] Technical features described separately in one drawing of the present disclosure may be implemented separately or may be implemented simultaneously.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] For clarity, the description focuses on 5G NR, but the technical concept of one embodiment of the present disclosure is not limited thereto.

[0046] For terms and techniques used herein but not specifically described, reference may be made to wireless communication standard documents published before filing of this specification.

[0047] Figure 1 The structure of the NR system based on the 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.

[0048] Reference Figure 1 , 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.

[0049] Figure 1 The embodiment of the invention exemplifies the 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.

[0050] 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 transfer 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.

[0051] Figure 2 A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 2 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 2 (a) in FIG. 1 shows a radio protocol stack for the user plane of Uu communication, and Figure 2 (b) in FIG. 1 shows a radio protocol stack of a control plane for Uu communication. Figure 2 (c) in FIG. 4 shows a radio protocol stack for the user plane of SL communication, and Figure 2 (d) in FIG. 1 shows the radio protocol stack of the control plane for SL communication.

[0052] Reference Figure 2 , the physical layer provides information transfer services to the upper layer through the physical channel. The physical layer is connected to the media access control (MAC) layer, which is the upper layer of the physical layer, through the transport channel. Data is transmitted 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.

[0053] 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.

[0054] The MAC layer provides services to the Radio Link Control (RLC) layer via logical channels, which 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 transfer services through logical channels.

[0055] 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).

[0056] 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 delivery 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).

[0057] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include delivery, header compression and encryption of user data. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include delivery and encryption / integrity protection of control plane data.

[0058] 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.

[0059] The configuration of RB means the process for specifying the radio protocol layer and channel attributes to provide a specific service and for determining the corresponding detailed parameters and operation methods. RB can then be classified into two types, namely, signaling (SRB) and data (DRB). SRB is used as a path for sending RRC messages in the control plane. DRB is used as a path for sending user data in the user plane.

[0060] When the RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state, otherwise the UE can be in the RRC idle (RRC_IDLE) state. In the case of NR, the RRC inactive (RRC_INACTIVE) state is additionally defined, and the UE in the RRC_INACTIVE state can maintain the connection with the core network and release its connection with the BS.

[0061] Data is sent from the network to the UE via a downlink transport channel. Examples of downlink transport channels include a broadcast channel (BCH) for sending system information and a downlink shared channel (SCH) for sending user traffic or control messages. Traffic for downlink multicast or broadcast services or control messages may be sent on a downlink SCH or an additional downlink multicast channel (MCH). Data is sent from the UE to the network via an uplink transport channel. Examples of uplink transport channels include a random access channel (RACH) for sending initial control messages and an uplink shared channel (SCH) for sending user traffic or control messages.

[0062] Examples of logical channels that belong to higher channels of the transport channel and are mapped onto the transport channel include broadcast channel (BCCH), paging control channel (PCCH), common control channel (CCCH), multicast control channel (MCCH), multicast traffic channel (MTCH), etc.

[0063] Figure 3 The structure of a radio frame of NR based on an 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.

[0064] Reference Figure 3 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 expanded 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).

[0065] 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).

[0066] Table 1 below shows the number of symbols (N) per slot according to the SCS configuration (u) when the normal CP is used. slot symb ), the number of time slots per frame (N frame,u slot ) and the number of time slots per subframe (N subframe,u slot ).

[0067] [Table 1]

[0068] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 15kHz(u=0) 14 10 1 30kHz(u=1) 14 20 2 60kHz(u=2) 14 40 4 120kHz(u=3) 14 80 8 240kHz(u=4) 14 160 16

[0069] Table 2 shows the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to SCS when the extended CP is used.

[0070] [Table 2]

[0071] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 60kHz(u=2) 12 40 4

[0072] 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.

[0073] 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.

[0074] 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).

[0075] [Table 3]

[0076] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz-6000MHz 15kHz, 30kHz, 60kHz FR2 24250MHz-52600MHz 60kHz, 120kHz, 240kHz

[0077] 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).

[0078] [Table 4]

[0079] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz-7125MHz 15kHz, 30kHz, 60kHz FR2 24250MHz-52600MHz 60kHz, 120kHz, 240kHz

[0080] Figure 4 The structure of the time slot of the NR frame based on the embodiment of the present disclosure is shown. Figure 4 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0081] Reference Figure 4 , a time slot includes multiple symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols. For example, in the case of extended CP, one time slot may include 12 symbols. 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.

[0082] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth part (BWP) can be defined as multiple consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP can correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via an activated BWP. Each element can be referred to as a resource element (RE) in a resource grid, and a complex symbol can be mapped to each element.

[0083] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0084] 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.

[0085] 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 inactive DL BWP. For example, the UE may not send a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) other than an activated UL BWP. For example, in the case of a downlink, the initial BWP may be given as a set of contiguous RBs for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by a physical broadcast channel (PBCH)). For example, in the case of an uplink, the initial BWP may be given by a system information block (SIB) for a random access procedure. For example, a default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be the initial DL BWP.To save energy, if the UE cannot detect downlink control information (DCI) during a specified period, the UE may switch the active BWP of the UE to the default BWP.

[0086] In addition, a BWP can be defined for SL. The same SL BWP can be used in transmission and reception. For example, a transmitting UE can send a SL channel or a SL signal on a specific BWP, and a receiving UE can receive a SL channel or a SL signal on a specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have configuration signaling separate from the Uu BWP. For example, the UE can receive a configuration for the SL BWP from the BS / network. For example, the UE can receive a configuration for the Uu BWP from the BS / network. SL BWP is (pre-)configured in the carrier for out-of-coverage NR V2X UEs and RRC_IDLE UEs. For UEs in RRC_CONNECTED mode, at least one SL BWP can be activated in the carrier.

[0087] Figure 5 An example of a BWP based on an embodiment of the present disclosure is shown. Figure 5 The embodiments of can be combined with various embodiments of the present disclosure. Figure 5 In an implementation manner, the number of BWPs is 3.

[0088] Reference Figure 5, 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.

[0089] It can be obtained by point A, the offset N relative to point A start BWP and bandwidth N size BWP To configure the BWP. For example, point A may be an external reference point of the PRBs of a carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) are aligned in point A. For example, the offset may be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth may be the number of PRBs within a given parameter set.

[0090] Hereinafter, V2X or SL communication will be described.

[0091] 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.

[0092] The physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for sending default (system) information, which the UE must first know before SL signal transmission / reception. For example, the default information can be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to resource pool, type of application related to SLSS, subframe offset, broadcast information, etc. For example, in order to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH can be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0093] 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.

[0094] Figure 6 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 6 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.

[0095] For example, Figure 6 (a) in FIG. 1 shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 6 (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.

[0096] For example, Figure 6 (b) in FIG. 4 shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 6 (b) in FIG. 1 shows UE operation related to NR resource allocation mode 2.

[0097] Reference Figure 6 (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.

[0098] 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.

[0099] In step S610, 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 S620, 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 S630, 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 S640, 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.

[0100] Reference Figure 6(b), in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the base station / network or the preconfigured SL resources. For example, the configured SL resources or the preconfigured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources in 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 S610, 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 S620, 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 S630, the first UE can receive a PSFCH related to the PSCCH / PSSCH from the second UE.

[0101] Reference Figure 6 (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.

[0102] Hereinafter, an example of SCI format 1-A will be described.

[0103] SCI format 1-A is used for scheduling of PSSCH and secondary SCI on PSSCH.

[0104] The following information is sent using SCI Format 1-A:

[0105] - Priority - 3 bits

[0106] - Frequency resource assignment - When the value of the higher layer parameter sl-MaxNumPerReserve is configured as 2, it is ceiling(log2(N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, when the value of the high-level parameter sl-MaxNumPerReserve is configured as 3, it is the ceiling log2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bit

[0107] - 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

[0108] -Resource reservation period - If the higher-level parameter sl-MultiReserveResource is configured, it is ceiling(log2 N rsv_period ) bits, where N rsv_period is the number of entries in the higher-level parameter sl-ResourceReservePeriodList; otherwise, it is 0.

[0109] -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

[0110] - Level 2 SCI format - 2 bits, as defined in Table 5

[0111] - Beta_offset indicator - 2 bits, as provided by the higher layer parameter sl-BetaOffsets2ndSCI

[0112] -Number of DMRS ports - 1 bit, as defined in Table 6

[0113] - Modulation and coding scheme - 5 bits

[0114] - 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

[0115] -PSFCH overhead indication - 1 bit if higher layer parameter sl-PSFCH-Period = 2 or 4; otherwise, 0 bit

[0116] The number of reserved bits is determined by the higher layer parameter sl-NumReservedBits, whose value is set to zero.

[0117] [Table 5]

[0118] 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

[0119] [Table 6]

[0120] The value of the DMRS Port Number field Antenna Port 0 1000 1 1000 and 1001

[0121] Hereinafter, an example of SCI format 2-A will be described.

[0122] SCI format 2-A is used for decoding of PSSCH with HARQ operation when HARQ-ACK information includes ACK or NACK, when HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.

[0123] The following information is sent using SCI Format 2-A:

[0124] -HARQ process number - 4 bits

[0125] - New data indicator - 1 bit

[0126] - Redundancy version - 2 bits

[0127] - Source ID - 8 bits

[0128] -Destination ID - 16 bits

[0129] -HARQ feedback enable / disable indicator - 1 bit

[0130] - Broadcast Type Indicator - 2 bits, as defined in Table 7

[0131] -CSI request - 1 bit

[0132] [Table 7]

[0133] The value of the broadcast type indicator Broadcast Type 00 broadcast 01 When the HARQ-ACK information includes ACK or NACK, it is multicast 10 Unicast 11 When the HARQ-ACK information includes only ACK, it is multicast

[0134] Hereinafter, an example of SCI format 2-B will be described.

[0135] SCI format 2-B is used for decoding of PSSCH with HARQ operation when HARQ-ACK information includes only NACK or when there is no feedback of HARQ-ACK information.

[0136] The following information is sent using SCI Format 2-B:

[0137] -HARQ process number - 4 bits

[0138] - New data indicator - 1 bit

[0139] - Redundancy version - 2 bits

[0140] - Source ID - 8 bits

[0141] -Destination ID - 16 bits

[0142] -HARQ feedback enable / disable indicator - 1 bit

[0143] - Region ID - 12 digits

[0144] -Communication range requirement - 4 bits, determined by the higher-level parameter sl-ZoneConfigMCR-Index

[0145] Reference Figure 6 (a) or (b), in step S630, the first UE may receive the PSFCH. For example, the first UE and the second UE may determine the PSFCH resources, and the second UE may use the PSFCH resources to send the HARQ feedback to the first UE.

[0146] Reference Figure 6 (a), in step S640, the first UE may send SL HARQ feedback to the base station via PUCCH and / or PUSCH.

[0147] Figure 7 Three broadcast types are shown according to embodiments of the present disclosure. Figure 7 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 7 (a) shows a broadcast type SL communication, Figure 7 (b) shows unicast type SL communication, and Figure 7 (c) shows multicast SL communication. In the case of unicast SL communication, the UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication may be replaced by SL multicast communication, SL one-to-many communication, etc.

[0148] In the following, the UE procedure for determining the subset of resources reported to higher layers in PSSCH resource selection in sidelink resource allocation mode 2 is described.

[0149] In resource allocation mode 2, the upper layer may request the UE to determine a subset of resources for the upper layer to select for PSSCH / PSCCH transmission. To trigger this process, in time slot n, the upper layer provides the following parameters for the PSSCH / PSCCH transmission.

[0150] - the resource pool for which the resource is to be reported;

[0151] -L1 priority prio TX ;

[0152] - Remaining packet delay budget;

[0153] -The number of subchannels used for PSSCH / PSCCH transmission in a time slot L subCH ;

[0154] -Optionally, the resource reservation interval P in milliseconds rsvp_TX .

[0155] -If the upper layer requests the UE to determine a subset of resources to be selected by the upper layer for PSSCH / PSCCH transmission as part of the re-evaluation or preemption process, the upper layer provides a set of resources that can be subject to re-evaluation (r0, r1, r2, ...) and a set of resources that can be subject to preemption (r′0, r′1, r′2, ...).

[0156] - Determined according to UE implementation in time slot r i ″-The subset of resources requested by higher layers before or after T3, where r i ″ is the time slot with the smallest time slot index among (r0, r1, r2, ...) and (r′0, r′1, r′2, ...), and T3 is equal to in, is defined in time slots, and where μ SL It is the SCS configuration of SL BWP.

[0157] The following high-level parameters influence this process:

[0158] -sl-SelectionWindowList: For a given prio Tx Value, internal parameter T 2min Set to the corresponding value from the higher-level parameter sl-SelectionWindowList.

[0159] -sl-Thres-RSRP-List: This high-level parameter provides i , p j ) combined RSRP threshold, where pi is the value of the priority field in the received SCI format 1-A, and pi is the transmit priority of the UE in selecting resources; for a given invocation of this procedure, p j =prio TX .

[0160] -s1-RS-ForSensing selects whether the UE uses PSSCH-RSRP or PSCCH-RSRP measurement.

[0161] -s1-ResourceReservePeriodList

[0162] -sl-SensingWindow: The internal parameter T0 is defined as the number of time slots corresponding to sl-SensingWindow milliseconds.

[0163] -sl-TxPercentageList: For a given prio Tx The internal parameter X is defined as sl-TxPercentageList(prio) which converts from percentage to ratio. TX ).

[0164] -sl-PreemptionEnable: If sl-PreemptionEnable is provided, and if it is not the same as "enabled", the internal parameter prio pre Set to the parameter sl-PreemptionEnable provided by higher layers.

[0165] If the resource reservation interval P is provided rsvp_TX , then the resource reservation interval is converted from milliseconds to logical time slots, resulting in P′ rsvp_Tx .

[0166] Notation:

[0167] It can represent the set of time slots belonging to the side link resource pool.

[0168] For example, the UE may select a set of candidate resources (Sa) based on Table 8. For example, when resource (re)selection is triggered, the UE may select a set of candidate resources (Sa) based on Table 8. For example, when re-evaluation or preemption is triggered, the UE may select a set of candidate resources (Sa) based on Table 8.

[0169] [Table 8]

[0170]

[0171]

[0172]

[0173] At this time, in the conventional unlicensed spectrum (NR-U), a communication method between a UE and a base station is supported in an unlicensed band. In addition, it is planned to support a mechanism for supporting communication between sidelink UEs in an unlicensed band in Rel-18.

[0174] In the present disclosure, a channel may refer to a set of frequency domain resources that perform listen-before-talk (LBT). In NR-U, a channel may refer to a 20 MHz LBT bandwidth and may have the same meaning as an RB set. For example, an RB set may be defined in Part 7 of 3GPP TS 38.214 V17.0.0.

[0175] In the present disclosure, channel occupancy (CO) may refer to the time domain / frequency domain resources obtained by a base station or a UE after LBT succeeds.

[0176] In the present disclosure, channel occupation time (COT) may refer to the time domain resources obtained by the base station or UE after LBT is successful. It can be shared between the base station (or UE) that obtains CO and the UE (or base station), and this may be referred to as COT sharing. Depending on the initiating device, this may be referred to as gNB-initiated COT or UE-initiated COT.

[0177] Hereinafter, a wireless communication system supporting an unlicensed band / shared spectrum will be described.

[0178] Figure 8 An example of a wireless communication system supporting an unlicensed frequency band based on an embodiment of the present disclosure is shown. Figure 8 Unlicensed spectrum (NR-U) wireless communication systems may be included. Figure 8 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0179] In the following description, a cell operating in a licensed band (hereinafter referred to as an L band) may be defined as an L cell, and a carrier of the L cell may be defined as (DL / UL / SL)LCC. In addition, a cell operating in an unlicensed band (hereinafter referred to as an U band) may be defined as a U cell, and a carrier of the U cell may be defined as (DL / UL / SL)UCC. The carrier / carrier frequency of a cell may refer to an operating frequency (e.g., a center frequency) of the cell. A cell / carrier (e.g., CC) is generally referred to as a cell.

[0180] When the base station and UE are in Figure 8When sending and receiving signals on the LCC and UCC of the carrier aggregation shown in (a), the LCC and UCC can be configured as a primary CC (PCC) and a secondary CC (SCC), respectively. Figure 8 As shown in (b), the base station and the UE can send and receive signals on one UCC or on a plurality of carrier aggregated UCCs. In other words, the base station and the UE can send and receive signals only on the UCC without using any LCC. For independent operation, PRACH transmission, PUCCH transmission, PUSCH transmission, SRS transmission, etc. can be supported on the UCell.

[0181] exist Figure 8 In the implementation manner, the base station may be replaced by a UE. In this case, for example, PSCCH transmission, PSSCH transmission, PSFCH transmission, S-SSB transmission, etc. may be supported on the UCell.

[0182] Unless otherwise stated, the following definitions apply to the following terms used in this disclosure.

[0183] - Channel: A carrier or a portion of a carrier consisting of a contiguous set of RBs where a channel access procedure is performed in a shared spectrum.

[0184] - Channel Access Procedure (CAP): A procedure to evaluate channel availability based on sensing before signal transmission in order to determine whether other communication nodes are using the channel. The basic sensing unit is a duration of T sl = 9us sensing time slot. The base station or UE senses the channel during the sensing time slot duration. If the power detected within at least 4us of the sensing time slot duration is less than the energy detection threshold X thresh , then the sensing time slot duration is considered to be T sl is idle. Otherwise, the sensing time slot duration is T sl = 9us is considered busy. CAP can also be called Listen Before Talk (LBT).

[0185] - Channel occupancy: Transmission of the base station / UE on the channel after the channel access procedure.

[0186] - Channel Occupancy Time (COT): The total time that a base station / UE and any base stations / UEs sharing the channel occupancy can perform transmission on a channel after the base station / UE performs a channel access procedure. In the case of determining the COT, if a transmission gap is less than or equal to 25us, the gap duration can be counted in the COT. The COT can be shared for transmission between a base station and a corresponding UE.

[0187] -DL transmit burst: A set of transmissions without any gaps greater than 16us from the base station. Transmissions from the base station separated by gaps greater than 16us are considered separate DL transmit bursts. The base station may perform transmissions after a gap without sensing channel availability within a DL transmit burst.

[0188] -UL or SL transmit burst: A set of transmissions without any gap greater than 16us from the UE. Transmissions from the UE separated by gaps greater than 16us are considered separate UL or SL transmit bursts. The UE may perform transmissions after a gap without sensing channel availability within the UL or SL transmit burst.

[0189] - Discovery Burst: A DL transmission burst that includes a set of signals and / or channels that are confined within a window and associated with a duty cycle. In an LTE-based system, a discovery burst may be a transmission initiated by a base station that includes PSS, SSS, and cell-specific RS (CRS) and also includes non-zero power CSI-RS. In an NR-based system, a discovery burst may be a transmission initiated by a base station that includes at least an SS / PBCH block and also includes a CORESET of a PDCCH for scheduling a PDSCH carrying SIB1, a PDSCH carrying SIB1, and / or non-zero power CSI-RS.

[0190] Fig. 9 A method for occupying resources in an unlicensed frequency band according to an embodiment of the present disclosure is shown. Fig. 9 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0191] Reference Fig. 9 , a communication node (e.g., base station, UE) in an unlicensed band should determine whether other communication nodes are using the channel before sending a signal. To this end, a communication node in an unlicensed band may perform a channel access procedure (CAP) to access the channel on which the transmission is performed. The channel access procedure may be performed based on sensing. For example, a communication node may perform carrier sensing (CS) before sending a signal in order to check whether other communication nodes are performing signal transmission. When other communication nodes are not performing signal transmission, an idle channel assessment (CCA) is confirmed. If the CCA threshold (e.g., X Thresh ) is predefined or configured by a higher layer (e.g., RRC), then if the detected channel energy is above the CCA threshold, the communication node can determine that the channel is busy. Otherwise, the communication node can determine that the channel is idle. If the channel is determined to be idle, the communication node can start signaling in the unlicensed band. CAP can be replaced by LBT.

[0192] Table 9 shows an example of a channel access procedure (CAP) supported in NR-U.

[0193] [Table 9]

[0194]

[0195] Referring to Table 9, LBT types or CAPs for DL / UL / SL transmission may be defined. However, Table 9 is only an example, and new types or CAPs may be defined in a similar manner. For example, Type 1 (also referred to as Cat-4 LBT) may be a channel access procedure based on random backoff. For example, in the case of Cat-4, the contention window may be changed. For example, Type 2 may be performed in the case of COT sharing within a COT acquired by a base station (gNB) or UE.

[0196] Hereinafter, an LBT subband (SB) (or RB set) will be described.

[0197] In a wireless communication system supporting an unlicensed band, a cell (or carrier (e.g., CC)) or BWP configured for a UE may have a larger bandwidth (BW) than in conventional LTE. However, the BW of a CCA that requires independent LBT operation may be restricted according to rules. A subband (SB) for performing LBT alone is defined as an LBT-SB. Then, multiple LBT-SBs may be included in one broadband cell / BWP. A set of RBs included in the LBT-SB may be configured by high-level (e.g., RRC) signaling. Therefore, one or more LBT-SBs may be included in one cell / BWP based on (i) the BW of the cell / BWP and (ii) RB set allocation information.

[0198] Fig.10 A case where a plurality of LBT-SBs are included in a license-exempt band 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.

[0199] Reference Fig.10 , multiple LBT-SBs may be included in the BWP of a cell (or carrier). The LBT-SB may have, for example, a 20MHz frequency band. The LBT-SB may include multiple consecutive (P)RBs in the frequency domain, and may therefore be referred to as a (P)RB set. Although not shown, a guard band (GB) may be inserted between the LBT-SBs. Therefore, the BWP may be configured in the form of {LBT-SB#0 (RB set #0)+GB#0+LBT-SB#1 (RB set #1+GB#1)+…+LBT-SB#(K-1) (RB set (#K-1))}. For convenience, the LBT-SB / RB index may be configured / defined in increasing order from the lowest frequency to the highest frequency.

[0200] Hereinafter, a channel access priority class (CAPC) will be described.

[0201] The CAPC for MAC CE and radio bearers can be fixed or configured to operate in FR1:

[0202] - Fixed as the lowest priority, used to fill the buffer status report (BSR) and the recommended bit rate MAC CE;

[0203] -Fixed as the highest priority, used for SRB0, SRB1, SRB3 and other MAC CEs;

[0204] -Configured by the base station, used for SRB2 and DRB.

[0205] When selecting the CAPC for a DRB, the base station considers fairness between other service types and transmissions while considering the 5QI of all QoS flows multiplexed to the corresponding DRB. Table 10 shows which CAPC should be used for a standardized 5QI, i.e., the CAPC for a given QoS flow. For a standardized 5QI, the CAPC is defined as shown in the following table, while for a non-standardized 5QI, the CAPC with the best QoS characteristics should be used.

[0206] [Table 10]

[0207]

[0208] Hereinafter, a method of transmitting a downlink signal through an unlicensed frequency band will be described. For example, the method of transmitting a downlink signal through an unlicensed frequency band may be applied to a method of transmitting a sidelink signal through an unlicensed frequency band.

[0209] The base station may perform one of the following channel access procedures (eg, CAP) for downlink signal transmission in the unlicensed band.

[0210] (1) Type 1 Downlink (DL) CAP method

[0211] In a Type 1 DL CAP, the length of the duration spanned by a sensing slot to be sensed as idle before transmission may be random. Type 1 DL CAP may be applied to the following transmissions:

[0212] - a transmission initiated by a base station, comprising (i) a unicast PDSCH with user plane data, or (ii) a unicast PDSCH with user plane data and a unicast PDCCH scheduling user plane data, or

[0213] - Transmissions initiated by the base station, including (i) only discovery bursts, or (ii) discovery bursts multiplexed with non-unicast information.

[0214] Fig.11 A CAP operation of transmitting a downlink signal through an unlicensed frequency band performed by a base station according to an embodiment of the present disclosure is shown. Fig.11 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0215] Reference Fig.11 , the base station can delay for a duration of T d The base station senses whether the channel is idle during the additional sensing time slot duration. Then, if the counter N is zero, the base station can perform transmission (S134). In this case, the base station can adjust the counter N by sensing the channel during the additional sensing time slot duration according to the following steps:

[0216] Step 1) (S120) The base station sets N to N init (N=N init ), where N init is evenly distributed between 0 and CW p Then step 4 continues.

[0217] Step 2) (S140) If N>0 and the base station determines to decrement the counter, the base station sets N to N-1 (N=N-1).

[0218] Step 3) (S150) The base station senses the channel during the additional sensing time slot duration. If the additional sensing time slot duration is idle (Y), step 4 is continued. Otherwise (N), step 5 is continued.

[0219] Step 4) (S130) If N=0 (Y), the base station terminates CAP (S132). Otherwise (N), step 2 continues.

[0220] Step 5) (S160) The base station senses the channel until the additional delay duration T d A busy sensing time slot is detected within 1 second, or an additional delay duration T is added d All time slots are detected as idle.

[0221] Step 6) (S170) If the channel is within the additional delay duration T d If the time slot of the POSIX ...

[0222] Table 11 shows the m applied to CAP p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT) and allowed CW size change according to the channel access priority level.

[0223] [Table 11]

[0224]

[0225] Referring to Table 11, the contention window size (CWS), maximum COT value, etc. of each CAPC can be defined. d Can be equal to T f +m p *T sl (T d =T f +m p *T sl ).

[0226] Delay duration T d Configure in the following order: Duration T f (16us)+m p Continuous sensing time slot duration T sl (9us).T f The sensing time slot duration T includes the beginning of the 16us duration sl .

[0227] Satisfies the following relationship: CW min,p <=CW p <=CW max,p .CW p Available via CW p =CW min,p The CW size may be configured and updated (CW size update) based on HARQ-ACK feedback (e.g., ratio of ACK or NACK) for a previous DL burst (e.g., PDSCH) before step 1. For example, the CW size may be updated based on HARQ-ACK feedback for a previous DL burst. p Initialize to CW min,p . Alternatively, CW p Can be increased to the next higher allowed value or left as is.

[0228] (2) Type 2 Downlink (DL) CAP Method

[0229] In a Type 2 DL CAP, the length of the duration spanned by a sensing slot to be sensed as idle before transmission may be deterministic. Type 2 DL CAPs are classified into Type 2A / 2B / 2C DL CAPs.

[0230] Type 2A DL CAP may be applied to the following transmissions. In Type 2A DL CAP, the base station may transmit the following transmissions during at least the sensing duration T short_dl = After sensing that the channel is idle within 25us, the transmission is performed immediately. In this paper, T short_dl Including duration Tf (=16 us) and immediately after the duration T f After a sensing time slot duration, the duration T f Includes a sensing slot at its beginning.

[0231] - A transmission initiated by a base station, including (i) a discovery burst only, or (ii) a discovery burst multiplexed with non-unicast information, or

[0232] - In the shared channel occupancy, the base station sends a transmission after a gap of 25us from the UE's transmission.

[0233] Type 2B DL ​​CAP is applicable to the transmission performed by the base station after a 16us gap from the UE's transmission during the shared channel occupation time. In Type 2B DL ​​CAP, the base station can sense that the channel is idle for T f = Send immediately after 16us. T f The sensing time slot within 9us from the end of the duration is included. Type 2C DL CAP is applicable to transmission performed by the base station after a maximum of 16us from the UE's transmission during the shared channel occupation time. In Type 2C DL CAP, the base station does not perform channel sensing before performing transmission.

[0234] Hereinafter, a method of transmitting an uplink signal through an unlicensed frequency band will be described. For example, the method of transmitting an uplink signal through an unlicensed frequency band may be applied to a method of transmitting a sidelink signal through an unlicensed frequency band.

[0235] The UE may perform Type 1 or Type 2 CAP for UL signal transmission in the unlicensed band. Typically, the UE may perform a CAP (e.g., Type 1 or Type 2) configured by the base station for UL signal transmission. For example, a UL grant (e.g., DCI formats 0_0 and 0_1) that schedules PUSCH transmission may include CAP type indication information for the UE.

[0236] (1) Type 1 Uplink (UL) CAP method

[0237] In Type 1 UL CAP, the length of the duration spanned by the sensing slot to be sensed as idle before transmission is random. Type 1 UL CAP may be applied to the following transmissions.

[0238] -PUSCH / SRS transmission scheduled and / or configured by the base station

[0239] - PUCCH transmission scheduled and / or configured by the base station

[0240] - Transmissions related to the Random Access Procedure (RAP)

[0241] Fig.12 A Type 1 CAP operation of transmitting an uplink signal performed by a UE according to an embodiment of the present disclosure is shown. Fig.12 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0242] Reference Fig.12 , UE delays for a duration of T d The UE senses whether the channel is idle during the additional sensing time slot duration. Then, if the counter N is zero, the UE may perform transmission (S234). In this case, the UE may adjust the counter N by sensing the channel during the additional sensing time slot duration according to the following steps:

[0243] Step 1) (S220) UE sets N to N init (N=N init ), where N init is evenly distributed between 0 and CW p Then step 4 continues.

[0244] Step 2) (S240) If N>0 and the UE determines to decrement the counter, the UE sets N to N-1 (N=N-1).

[0245] Step 3) (S250) The UE senses the channel during the additional sensing time slot duration. If the additional sensing time slot duration is idle (Y), step 4 is continued. Otherwise (N), step 5 is continued.

[0246] Step 4) (S230) If N=0 (Y), the UE terminates the CAP (S232). Otherwise (N), step 2 continues.

[0247] Step 5) (S260) The UE senses the channel until the additional delay duration T d A busy sensing time slot is detected within 1 second, or an additional delay duration T is added d All time slots are detected as idle.

[0248] Step 6) (S270) If the channel is within the additional delay duration T d If the time slot is sensed as idle for the duration of all time slots (Y), then step 4 is continued. Otherwise (N), step 5 is continued.

[0249] Table 12 shows the m applied to CAP p , minimum CW, maximum CW, maximum channel occupancy time (MCOT) and allowed CW size change according to the channel access priority level.

[0250] [Table 12]

[0251]

[0252] Referring to Table 12, the contention window size (CWS), maximum COT value, etc. of each CAPC can be defined. d Can be equal to T f +m p *T sl (T d =T f +m p *T sl ).

[0253] Delay duration T d Configure in the following order: Duration T f (16us)+m p Continuous sensing time slot duration T sl (9us).T f The sensing time slot duration T includes the beginning of the 16us duration sl .

[0254] Satisfies the following relationship: CW min,p <=CW p <=CW max,p .CW p Available via CW p =CW min,p to be configured, and updated (CW size update) based on an explicit / implicit reception response to a previous UL burst (e.g., PUSCH) before step 1. For example, the CW size may be updated based on an explicit / implicit reception response to a previous UL burst. p Initialize to CW min,p . Alternatively, CW p Can be increased to the next higher allowed value or left as is.

[0255] (2) Type 2 Uplink (UL) CAP method

[0256] In a Type 2 UL CAP, the length of the duration spanned by the sensing slot to be sensed as idle before transmission may be deterministic. Type 2 UL CAPs are classified as Type 2A / 2B / 2C UL CAPs. In a Type 2A UL CAP, the UE may sense that the channel is idle for at least the sensing duration T. short_dl =25us and then the transmission is executed immediately. In this article, T short_dl Including duration T f (=16us) and then for a duration of T f The duration of a sensing slot after that. In Type 2A UL CAP, T fIn a Type 2B UL CAP, the UE may sense that the channel is idle for a sensing duration T. f =16us and then the transmission is performed immediately. In Type 2B UL CAP, T f The sensing slot within 9us from the end of the duration is included. In Type 2C UL CAP, the UE does not perform channel sensing before performing transmission.

[0257] For example, according to NR-U operation based on Type 1 LBT, a UE having uplink data to be transmitted may select a CAPC mapped to 5QI data, and the UE may select a CAPC mapped to 5QI data by applying parameters of the corresponding CACP (e.g., minimum contention window size, maximum contention window size, m p The UE may select a backoff counter (BC) after selecting a random value between the minimum CW and the maximum CW mapped to the CAPC. In this case, for example, BC may be a positive integer less than or equal to the random value. If the channel is idle, the UE sensing the channel decreases BC by 1. If BC becomes zero and the UE detects that the channel is idle for time T d (T d =T f +m p *T sl ), the UE can try to send data by occupying the channel. sl (=9usec) is a basic sensing unit or sensing time slot and may include a measurement duration of at least 4usec. f The first 9usec of (=16usec) can be configured as T sl .

[0258] For example, according to NR-U operation based on Type 2 LBT, the UE may send data by performing Type 2 LBT (e.g., Type 2A LBT, Type 2B LBT, or Type 2C LBT) within the COT.

[0259] For example, Type 2A (also known as Cat-2 LBT (one time slot LBT) or single LBT) can be a single LBT of 25usec. In this case, the transmission can start immediately after the idle sensing for at least 25usec gap. Type 2A can be used to initiate the transmission of SSB and non-unicast DL information. That is, the UE can sense the channel within the COT for 25usec, and if the channel is idle, the UE can attempt to send data by occupying the channel.

[0260] For example, type 2B may be a 16usec single LBT. In this case, transmission may start immediately after idle sensing for a 16usec gap. That is, the UE may sense the channel for 16usec within the COT, and if the channel is idle, the UE may attempt to transmit data by occupying the channel.

[0261] For example, in the case of Type 2C (also known as Cat-1 LBT or no LBT), LBT may not be performed. In this case, transmission may start immediately after a gap of up to 16 usec, and the channel may not be sensed before transmission. The duration of transmission may be up to 584 usec. The UE may attempt to transmit after 16 usec without sensing, and the UE may perform transmission of up to 584 usec.

[0262] In the sidelink unlicensed band, the UE can perform a channel access operation based on listen before talk (LBT). Before the UE accesses a channel in the unlicensed band, the UE should check whether the channel to be accessed is idle (e.g., a state in which the UE is not occupying the channel, a state in which the UE can access the corresponding channel and send data) or busy (e.g., a state in which the channel is occupied and data transmission / reception is performed on the corresponding channel, and a UE attempting to access the channel cannot send data when the channel is busy). That is, the operation of the UE checking whether the channel is idle or busy can be referred to as a clear channel assessment (CCA), and the UE can check whether the channel is idle or busy during the CCA duration.

[0263] In the present specification, the word "configuration or definition" may be interpreted as (pre)configured by a base station or a network (via predefined signaling (e.g., SIB, MAC signaling, RRC signaling)). For example, "A may be configured" may include "the base station or the network (pre) configures / defines or notifies UE A". Alternatively, the word "configuration or definition" may be interpreted as preconfigured or predefined by the system. For example, "A may be configured" may include "A is preconfigured / defined by the system".

[0264] According to one embodiment of the present disclosure, 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 rules or requirements, a channel sensing operation (e.g., energy detection / measurement) for the channel to be used precedes the UE's transmission. For example, the UE may perform transmission in the unlicensed band only when the channel or RB to be used as a result of channel sensing is determined to be idle (IDLE) (e.g., if the measured energy is less than, equal to, or greater than a certain threshold), and conversely, if the channel or RB set to be used as a result of channel sensing is determined to be busy (BUSY) (e.g., if the measured energy is greater than, equal to, or greater than a certain threshold), the UE may cancel all or part of the transmission in the unlicensed band.

[0265] According to one embodiment of the present disclosure, in the operation in the unlicensed band, the UE may omit or simplify the channel sensing operation (i.e., make the channel sensing interval relatively small) for a certain period of time within a certain time interval after transmission, or conversely, after a certain time interval after transmission, the UE may decide whether to transmit after performing a normal channel sensing operation. On the other hand, in the transmission in the unlicensed band, according to the rules 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 respectively greater than or equal to a certain level. On the other hand, in the unlicensed band, in order to simplify channel sensing, it may be notified through the channel occupancy time (COT) duration information that it occupies the channel obtained by the initial general channel sensing for a certain period of time, and the maximum value of the length of the COT duration may be set differently according to the priority value of the service or data packet.

[0266] For example, the UE may perform channel sensing and / or perform a resource selection process for sidelink transmission (e.g., PSCCH and / or PSSCH and / or S-SSB and / or PSFCH, etc.) only when the result of channel sensing is idle. For example, the UE may perform a resource selection process for sidelink transmission only after the COT duration has been ensured. For example, in the resource selection process, the UE may select transmission resources by avoiding resources expected to have a relatively high interference level, which is expected to be based on the reserved resources of other UEs estimated based on the SCI received in the sidelink sensing window. For example, when the UE selects resources for sidelink communication, the resources may be limited to fall within the COT duration configured for the UE and / or the COT duration configured by the UE.

[0267] For example, the UE may select a transmission resource for sidelink transmission through a resource selection process based on sidelink sensing, perform a channel sensing operation immediately before performing actual transmission on the selected resource, and perform actual transmission only when the selected resource is idle according to the result of the channel sensing. For example, the reserved resources that can be indicated by the first SCI by the UE may be limited to resources within a COT duration configured for the UE and / or within a COT duration configured by the UE and / or within a COT duration indicated by an SCI sent by the UE.

[0268] According to one embodiment of the present disclosure, when PSCCH / PSSCH is actually transmitted, all or part of the resources selected by the UE for sidelink transmission can be indicated in the form of reserved resources via the first SCI. For example, the time interval between the selected resources for sidelink transmission can be set to be less than or equal to the maximum value of the COT duration. For example, the difference between the time point of transmitting the first SCI and the time point of the reserved resources indicated by the first SCI can all be set to be less than or equal to the maximum value of the COT duration. For example, the maximum value of the above COT duration can be (pre) configured or predefined according to the SL priority value for sidelink transmission.

[0269] For example, the match between the SL priority value and the priority value for operation in the unlicensed band may be (pre)configured and predefined such that the priority value for the unlicensed band operation is automatically determined.

[0270] For example, the time point at which the first SCI is received and the time point (or specific channel) at which all or part of the reserved resources indicated in the first SCI are occupied can be indicated via the first SCI. For example, another UE that receives the first SCI can interpret the interval from the time point at which the first SCI is received to the time point at which the reserved resources indicated by the first SCI are reserved (or the interval including the time point at which the reserved resources indicated by the first SCI are reserved) as the COT duration of the UE that sends the first SCI. For example, the above specific channel can be a channel or RB set, which is a basic unit of operation of an unlicensed band including resources on which the first SCI is sent. For example, in the above, the specific channel can be a channel or RB set as a basic unit of operation of an unlicensed band including reserved resources indicated by the first SCI. For example, in the above, configuring the COT duration via the sidelink reserved resource indication can be the case where the channel or RB set at which the first SCI is sent is the same as the channel or RB set where the reserved resources are located. For example, the configuration of the COT duration can be limited to the reserved resources from the time point at which the first SCI is received to the first (earliest) reserved resource indicated by the first SCI.

[0271] According to one embodiment of the present disclosure, in operation in an unlicensed band, when a UE reserves sidelink resources, the reservation may not result in actual transmission according to the channel sensing result. For example, when the UE performs a resource (re)selection process, the UE may use the channel sensing result for the received SCI to determine whether to exclude all or part of the reserved resources indicated by the received SCI within the sidelink sensing window from the set of available candidate resources.

[0272] For example, when the channel sensing result value (e.g., energy measurement value) for the received SCI is higher than or equal to or exceeds a (pre) configured or predefined threshold, the UE can determine that the reserved resources indicated by the SCI are busy, and exclude candidate resources that overlap with the reserved resources and / or the channel or RB set including the reserved resources from the set of available candidate resources. This is because, if actual transmission occurs on resources reserved by another UE, the channel sensing result may be busy even at the above time point. For example, if the channel sensing result for the received SCI is busy, the UE can determine that the next reserved resource indicated by the SCI and / or all reserved resources are busy, and / or channel sensing may not be performed for the reserved resources. For example, in the above, the reserved resources may be restricted to being within the same RB set as the SCI indicating it.

[0273] For example, if the channel sensing result value (e.g., energy measurement value) for the received SCI is lower than or equal to or lower than a (pre) configured or predefined threshold, the UE may determine that the reserved resources indicated by the SCI are idle, and may not exclude any candidate resources overlapping with the reserved resources and / or the channel or RB set including the reserved resources from the set of available candidate resources. For example, in the above situation, at the time point of actual UE transmission, if the final channel or RB set is determined to be busy through additional channel sensing operations, the UE may still not perform actual transmission on the reserved resources.

[0274] For example, if the channel sensing result value (e.g., energy measurement value) for the received SCI is higher than or equal to or exceeds a (pre) configured or predefined threshold, the UE may determine the available candidate resources based on the RSRP measurement value (based on PSCCH DMRS and / or PSSCH DMRS) corresponding to the received SCI. For example, in the above, if the RSRP measurement value is greater than or equal to or exceeds the RSRP threshold, the UE may exclude the reserved resources indicated by the received SCI from the available candidate resources. For example, the RSRP threshold may be a (pre) configured value for each transmission priority and / or reception priority, or may be a value that is increased several times from the above configured value during the resource (re) selection process.

[0275] For example, if the channel sensing result value (e.g., energy measurement value) for the received SCI is lower than or equal to or lower than a (pre) configured or predefined threshold, the UE may determine the available candidate resources based on the RSRP measurement value (based on PSCCH DMRS and / or PSSCH DMRS) corresponding to the received SCI. For example, in the above, if the RSRP measurement value is greater than or equal to or exceeds the RSRP threshold, the UE may exclude the reserved resources indicated by the received SCI from the available candidate resources. For example, in the above, the RSRP threshold may be a value (pre) configured for each transmission priority and / or reception priority, or may be a value that is increased several times from the above-configured value during the resource (re)selection process.

[0276] According to one embodiment of the present disclosure, when a resource (re)selection process based on sidelink sensing is performed, the timing of resource use (when the channel sensing result is busy or idle) and / or whether the resource is used can be changed according to the number of times the RSRP threshold is raised or the (final or set) threshold. For example, if the RSRP threshold is greater than a (pre)configured value or a predefined value (e.g., a threshold for channel sensing or its conversion), even if the channel sensing result for the received SCI is idle, the candidate resources overlapping with the reserved resources indicated by the received SCI can be excluded from the available candidate resources.

[0277] For example, if the reserved resources indicated in the received SCI are excluded from the available resources based on their RSRP measurement value (when the RSRP measurement value is greater than and / or equal to a (pre) configured threshold and / or a value increased from the value), the UE may not perform channel sensing for the reserved resources. For example, the reserved resources may be limited to the following cases: all RBs in the RB set are used, and / or the ratio of the number of allocated RBs to the number of all RBs in the RB set is higher than a (pre) configured or predefined threshold, and / or the number of RBs and / or the number of subchannels used for the reserved resources is higher than or equal to a (pre) configured or predefined threshold.

[0278] For example, the UE may not perform channel sensing when performing a sensing operation, but may perform channel sensing only before actual transmission. For example, in the above case, the UE may perform resource (re)selection based on sidelink sensing, but perform channel sensing only before actual transmission, and determine whether to perform actual transmission based on the result.

[0279] For example, the UE may perform channel sensing on the reserved resources indicated in the received SCI, and if the result of the channel sensing is idle, the UE may re-include candidate resources overlapping with the reserved resources in the available resources. For example, if the UE has excluded candidate resources overlapping with the reserved resources from the available resources based on the RSRP measurement value, the reserved resources may be the excluded reserved resources. For example, the reserved resources used to cancel the above-mentioned resource exclusion process may be resources on which the UE has performed channel sensing, and / or may be any reserved resources indicated in the received SCI.

[0280] For example, the UE may perform channel sensing on the resources selected for sidelink transmission, and if the channel sensing result is busy, the UE may report to the higher layer (for the selected resources) that the resources are not used due to LBT failure or channel sensing failure.

[0281] According to one embodiment of the present disclosure, the UE may obtain COT duration information from a base station, another UE, or itself, and may not allow sidelink transmission during the COT duration. For example, if the selected resource is in the COT duration (where sidelink transmission is not allowed), the UE may report re-evaluation (RE-EVLUATION) or report preemption (PRE-EMPTION) or a third state (channel sensing failure) to the upper layer for the resource selected for sidelink transmission. For example, in the above situation, the UE may perform reselection for reserved resources within different COT durations.

[0282] Fig.13 A process in which a medium access control (MAC) layer of a first device triggers resource reselection based on a failure of channel sensing according to one 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.

[0283] Reference Fig.13 For example, in step S1310, the physical (PHY) layer of the first device may perform the channel sensing (e.g., LBT) operation described herein. In this embodiment, it is assumed that the channel sensing operation fails, that is, the strength of the signal received during the channel sensing operation of the first device exceeds the threshold, so that the result of the channel sensing is busy.

[0284] In step S1320, the PHY layer may report (or deliver) the failure of the channel sensing operation (or the result of the channel sensing operation is busy) to the MAC layer of the first device.

[0285] In step S1330 , the MAC layer may trigger resource reselection for the first resource related to the channel sensing operation.

[0286] In step S1340, the first device may reselect the first resource as the second resource. For example, the second resource may be a resource after the third resource previously selected with the first resource. Alternatively, for example, the second resource may be a resource before the third resource previously selected with the first resource. For example, the second resource may be a resource included in the COT duration associated with the first resource.

[0287] In step S1350, the PHY layer of the first device may perform a channel sensing operation based on the reselected second resource. Here, it is assumed that the channel sensing operation for the second resource is successful. That is, as a result of the channel sensing related to the second resource, no signal strength above the threshold is detected. In step S1360, the first device may perform an SL sending operation to the second device based on the second resource.

[0288] Fig.14 A process in which a PHY layer of a first device reports a failure of a channel sensing operation to a MAC layer of the first device according to an embodiment of the present disclosure is shown. Fig.14 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0289] Reference Fig.14 In step S1410, the first device may obtain information related to a COT duration for performing SL transmission in an unlicensed band. For example, the COT duration may be directly determined by the first device based on initial channel sensing, or by receiving relevant COT duration information from a base station or another UE. For example, the COT duration may refer to a time interval for the first device to perform communication in an unlicensed band.

[0290] In step S1420, the first device may select a transmission resource for performing SL transmission. For example, the transmission resource may be a resource included in the COT duration. For example, the transmission resource may be selected based on a sensing-based resource selection method. For example, the transmission resource may be selected based on a random selection scheme.

[0291] In step S1430, the PHY layer of the first device may perform channel sensing before the start time point of sending the resource according to the channel sensing interval. For example, the channel sensing operation may include a listen-before-talk (LBT) operation. For example, in this embodiment, it is assumed that the LBT operation fails, that is, the strength of the signal received during the channel sensing operation of the first device exceeds a threshold value, so that the result of the channel sensing is busy.

[0292] In step S1440, the PHY layer of the first device may notify the MAC layer of the first device of the failure of the channel sensing operation. The MAC layer of the first device may perform subsequent operations such as resource reselection and / or resource abandonment based on the failure of the channel sensing operation.

[0293] According to an embodiment of the present disclosure, the operation of the UE to avoid other COT durations for sidelink transmission may vary according to the priority value of the sidelink transmission. For example, the UE may perform an operation to avoid another COT duration only when the transmission priority value is higher than a (pre) configured threshold.

[0294] For example, when the UE (re)selects a transmission resource, the reserved resources of other UEs derived from the received SCI may be avoided as candidate transmission resources and / or transmission resources, and / or resources within a certain interval (within the same RB set) before the reserved resources, and / or resources within a certain interval (within the same RB set) after the reserved resources. For example, when the RSRP measurement value of the reserved resources for other UEs derived from the received SCI is greater than or equal to an RSRP threshold (e.g., a value derived from a (pre)configured initial value for a combination of a transmission priority value and / or a reception priority value), and / or if the transmission priority value of the UE is less than and / or equal to the reception priority value of the other UE, and / or if the reception priority value of the other UE is less than or equal to or less than a (pre)configured threshold, and / or if the transmission priority value of the UE is greater than or equal to or exceeds a (pre)configured threshold, the above operation may be performed.

[0295] For example, the specific time interval before and / or after the reserved resources of other UEs may be determined based on the CAPC value and / or SL priority value and / or (pre) configured value and / or channel access type for the reserved resources, and / or whether the UE's transmission and the reserved resources of other UEs share the same COT and / or CAPC value and / or SL priority value and / or channel access type for the UE's transmission, etc. For example, the specific time interval before the reserved resources may be a value related to the channel sensing interval of the reserved resources, an expected value, or an actual value. For example, the length of the specific time interval after the reserved resources may be a value related to the channel sensing interval of the UE's transmission, an expected value, or an actual value.

[0296] Various schemes of the present disclosure may be differently applied according to a channel access type for transmission of a UE and / or reception of a UE.

[0297] Various aspects of the present disclosure may be differently applied depending on whether the COT duration is initiated by the UE or the base station.

[0298] Various aspects of the present disclosure may be differently applied depending on whether the COT duration is initiated by the transmitting UE or by the third UE.

[0299] Various schemes of the present disclosure may be applied differently for each unicast session (group) and / or each broadcast type and / or each transmission priority value and / or each SL transmission enabling / disabling SL HARQ-ACK feedback and / or each SL HARQ-ACK feedback option.

[0300] In an embodiment of the present disclosure, various schemes may be differently applied according to the type of channel access indicated by another UE.

[0301] The embodiments of the present disclosure may be applied in different combinations as described above, depending on the transmission within or outside the channel occupation time (COT). The embodiments of the present disclosure may be applied in different combinations as described above, depending on the form of the COT (e.g., semi-static or time-varying). The embodiments of the present disclosure may be applied in different combinations as described above, depending on the carrier, depending on the presence or absence of protection between RB sets, or depending on the rule.

[0302] Various schemes in the present disclosure may be applied differently for each priority class (PRIORITY CLASS) or SL priority value.

[0303] The various schemes described herein may be applied differently to different SL channels. Depending on the type of information included in the SL channel, the various methods described herein may be applied differently.

[0304] According to the prior art, SL communication in an unlicensed band is not supported, and therefore, for communication in an unlicensed band, a channel sensing operation that needs to be performed during a channel sensing interval before sending resources is not supported. According to an embodiment of the present disclosure, a channel sensing operation for SL communication in an unlicensed band can be performed, so that subsequent operations such as resource reselection can be performed by reporting the channel sensing results to a higher layer of the UE in a busy situation.

[0305] Fig.15 A process in which a first device performs wireless communication according to an embodiment of the present disclosure is shown. Fig.15 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0306] Reference Fig.15, in step S1510, the first device may trigger resource selection at the time slot. In step S1520, the first device may determine the time interval based on the remaining packet delay budget (PDB) from the time slot based on the triggering of resource selection. In step S1530, the first device may select resources for side link (SL) transmission within the time interval based on sensing. In step S1540, the first device may perform channel sensing within the interval before the starting time point of the resource according to the channel sensing interval. For example, the result of the channel sensing may be busy, and the result of the channel sensing may be delivered from the physical (PHY) layer of the first device to the medium access control (MAC) layer of the first device.

[0307] For example, the time interval may be included in a channel occupancy time (COT) duration.

[0308] For example, in addition, the first device may perform initial channel sensing; and determine the COT duration based on a result of the initial channel sensing.

[0309] For example, initial channel sensing may be performed within a license-exempt band.

[0310] For example, in addition, the first device may obtain information related to the COT duration.

[0311] For example, in addition, the first device may transmit sidelink control information (SCI) including information related to the COT duration to the second device.

[0312] For example, the COT duration may be included in a license-exempt band.

[0313] For example, the sensing may include: receiving an SCI from the second device within the sensing interval; and decoding the SCI.

[0314] For example, in addition, the first device may determine the overlap of the channel sensing interval associated with the transmission resources of the second device and the channel sensing interval associated with the resources included in the SCI; and determine to perform SL transmission based on the priority associated with the transmission resources being lower than the priority associated with the resources.

[0315] For example, in addition, the first device may determine not to perform SL transmission based on that a reference signal received power (RSRP) related to the SCI is greater than a threshold.

[0316] For example, in addition, the first device may trigger resource reselection based on the result of the channel sensing.For example, resource reselection may be triggered from the MAC layer of the first device.

[0317] For example, additionally, the first device may reselect the resource as the reselected resource based on a trigger for resource reselection.

[0318] For example, in addition, the first device may transmit an SCI including information related to reselecting resources to the second device.

[0319] The above-mentioned embodiments can be applied to the various devices described below. First, the processor 102 of the first device 100 can trigger resource selection at a time slot. And, the processor 102 of the first device 100 can determine the time interval based on the remaining packet delay budget (PDB) from the time slot based on the triggering of resource selection. And, the processor 102 of the first device 100 can select resources for side link (SL) transmission within the time interval based on sensing. And, the processor 102 of the first device 100 can perform channel sensing within the interval before the starting time point of the resource according to the channel sensing interval. For example, the result of the channel sensing can be busy, and the result of the channel sensing can be delivered from the physical (PHY) layer of the first device 100 to the medium access control (MAC) layer of the first device 100.

[0320] According to an embodiment of the present disclosure, a first device for performing wireless communication may be proposed. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors, the one or more processors being connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: trigger resource selection at a time slot; based on the triggering of resource selection, determine a time interval based on the remaining packet delay budget (PDB) from the time slot; select resources for side link (SL) transmission within the time interval based on sensing; and perform channel sensing within the interval before the starting time point of the resource according to the channel sensing interval, wherein the result of the channel sensing may be busy, and wherein the result of the channel sensing may be delivered from the physical (PHY) layer of the first device to the medium access control (MAC) layer of the first device.

[0321] For example, the time interval may be included in a channel occupancy time (COT) duration.

[0322] For example, in addition, the first device may perform initial channel sensing; and determine the COT duration based on a result of the initial channel sensing.

[0323] For example, initial channel sensing may be performed within a license-exempt band.

[0324] For example, in addition, the first device may obtain information related to the COT duration.

[0325] For example, in addition, the first device may transmit sidelink control information (SCI) including information related to the COT duration to the second device.

[0326] For example, the COT duration may be included in a license-exempt band.

[0327] For example, the sensing may include: receiving an SCI from the second device within the sensing interval; and decoding the SCI.

[0328] For example, in addition, the first device may determine the overlap of the channel sensing interval associated with the transmission resources of the second device and the channel sensing interval associated with the resources included in the SCI; and determine to perform SL transmission based on the priority associated with the transmission resources being lower than the priority associated with the resources.

[0329] For example, in addition, the first device may determine not to perform SL transmission based on that a reference signal received power (RSRP) related to the SCI is greater than a threshold.

[0330] For example, in addition, the first device may trigger resource reselection based on the result of the channel sensing.For example, resource reselection may be triggered from the MAC layer of the first device.

[0331] For example, additionally, the first device may reselect the resource as the reselected resource based on a trigger for resource reselection.

[0332] For example, in addition, the first device may transmit an SCI including information related to reselecting resources to the second device.

[0333] 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: one or more processors; and one or more memories, the one or more memories being operably connected to the one or more processors and storing instructions. For example, the one or more processors may execute instructions to: trigger resource selection at a time slot; based on the triggering of resource selection, determine a time interval based on the remaining packet delay budget (PDB) from the time slot; select resources for side link (SL) transmission within the time interval based on sensing; and perform channel sensing within an interval before the starting time point of the resource according to the channel sensing interval, wherein the result of the channel sensing may be busy, and wherein the result of the channel sensing may be delivered from the physical (PHY) layer of the first UE to the medium access control (MAC) layer of the first UE.

[0334] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be proposed. For example, when the instructions are executed, the first device may: trigger resource selection at a time slot; based on the triggering of resource selection, determine a time interval based on the remaining packet delay budget (PDB) from the time slot; select resources for side link (SL) transmission within the time interval based on sensing; and perform channel sensing within the interval before the starting time point of the resource according to the channel sensing interval, wherein the result of the channel sensing may be busy, and wherein the result of the channel sensing may be delivered from the physical (PHY) layer of the first device to the medium access control (MAC) layer of the first device.

[0335] Fig.16 A process in which a second device performs wireless communication according to an embodiment of the present disclosure is shown. Fig.16 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0336] Reference Fig.16 In step S1610, the second device may receive side link control information (SCI) including information related to the reselected resources from the first device based on the reselected resources. In step S1620, the second device may perform side link (SL) reception based on the reselected resources. For example, the reselected resources may be reselected from the resources based on a trigger for resource reselection, the resource reselection may be triggered from the medium access control (MAC) layer of the first device based on the result of channel sensing being busy, the result of channel sensing may be delivered from the physical (PHY) layer of the first device to the MAC layer of the first device, the resources may be selected within a time interval based on sensing, and the time interval may be determined based on a trigger for resource selection triggered at a time slot, based on a remaining packet delay budget (PDB) from the time slot.

[0337] For example, the time interval may be included in a channel occupancy time (COT) duration.

[0338] The above-mentioned embodiments can be applied to the 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) including information related to the reselected resources from the first device 100 based on the reselected resources. And, the processor 202 of the second device 200 can control the transceiver 206 to perform side link (SL) reception based on the reselected resources. For example, the reselected resources can be reselected from the resources based on a trigger of resource reselection, and the resource reselection can be triggered from the medium access control (MAC) layer of the first device 100 based on the result of channel sensing being busy, and the result of channel sensing can be delivered from the physical (PHY) layer of the first device 100 to the MAC layer of the first device 100, and the resources can be selected within a time interval based on sensing, and the time interval can be determined based on the trigger of resource selection triggered at a time slot, based on the remaining packet delay budget (PDB) from the time slot.

[0339] 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: one or more memories storing instructions; one or more transceivers; and one or more processors, the one or more processors being connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: based on reselecting resources, receive side link control information (SCI) including information related to reselecting resources from a first device; and perform side link (SL) reception based on reselecting resources, wherein the reselected resources may be reselected from resources based on a trigger for resource reselection, wherein the resource reselection may be triggered from a medium access control (MAC) layer of the first device based on the result of channel sensing being busy, wherein the result of channel sensing may be delivered from a physical (PHY) layer of the first device to a MAC layer of the first device, wherein resources may be selected within a time interval based on sensing, and the time interval may be determined based on a trigger for resource selection triggered at a time slot, based on a remaining packet delay budget (PDB) from the time slot.

[0340] For example, the time interval may be included in a channel occupancy time (COT) duration.

[0341] Various embodiments of the present disclosure may be combined with each other.

[0342] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0343] 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).

[0344] 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.

[0345] Fig.17 A communication system 1 according to an embodiment of the present disclosure is shown. Fig.17 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0346] Reference Fig.17 , a communication system (1) to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, vehicles 100b-1 and 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 a head mounted device (HMD), a head up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital sign, a vehicle, a robot, 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.

[0347] 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. In addition 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) and the like. 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.

[0348] 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.

[0349] Wireless communication / connection 150a, 150b or 150c may be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. Here, the wireless communication / connection may be established through various RATs (e.g., 5GNR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device may send / receive radio signals to / from each other through wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b may send / receive signals through various physical channels. To this end, at least a portion of various configuration information for configuring a process for sending / receiving a radio signal, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and a resource allocation process may be performed based on various proposals of the present disclosure.

[0350] Fig.18 A wireless device according to an embodiment of the present disclosure is shown. Fig.18 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0351] Reference Fig.18 , the first wireless device 100 and the second wireless device 200 may transmit radio signals via various RATs (e.g., LTE and NR). Herein, {the first wireless device 100 and the second wireless device 200} may correspond to Fig.17 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0352] 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 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flow charts disclosed in this document. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102, and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including commands for executing part or all of the processes controlled by the processor 102 or for executing the descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document. Herein, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0353] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202, and may store various information related to the operation of the processor 202. For example, the memory 204 may store software codes including commands for executing part or all of the processes controlled by the processor 202 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. Herein, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 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. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0354] In the following, 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 not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0355] 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. As an 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 flow charts 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 flow charts 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 to be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document may be implemented in the form of codes, commands and / or command sets using firmware or software.

[0356] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 may be configured by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of 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 by various technologies such as wired or wireless connections.

[0357] 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 chart 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 chart 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 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 flow charts 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 so as to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0358] Fig.19 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown. Fig.19 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0359] Reference Fig.19 The signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a precoder (1040), a resource mapper (1050), and a signal generator (1060). Fig.19 Operation / function, not limited to Fig.18The processors 102 and 202 and / or the transceivers 106 and 206 of Fig.18 The processors 102 and 202 and / or the transceivers 106 and 206 implement Fig.19 For example, you can Fig.18 The processors 102 and 202 of the embodiment of the present invention implement blocks 1010 to 1060. Alternatively, the processors 102 and 202 of the embodiment of the present invention may implement blocks 1010 to 1060 by Fig.18 The processors 102 and 202 implement blocks 1010 to 1050 and can be implemented by Fig.18 The transceivers 106 and 206 of the embodiment of the present invention implement block 1060.

[0360] The codeword can be passed Fig.19 The signal processing circuit 1000 converts the codeword into a radio signal. Herein, the codeword is a coded bit sequence of an information block. The information block may include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0361] 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 the corresponding antenna port 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.

[0362] 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.

[0363] Can be used with Fig.19 The signal processing process for a signal received in a wireless device is configured in a manner opposite to the signal processing processes 1010 to 1060 of the wireless device. Fig.18 100 and 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.

[0364] Fig. 20 Another example of a wireless device based on an embodiment of the present disclosure is shown. The wireless device can be configured to provide a wireless device according to the usage / service (see Fig.17 ) are implemented in various forms. Fig. 20 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0365] Reference Fig. 20 , the wireless devices 100 and 200 may correspond to Fig.18 The wireless devices 100 and 200 may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 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 a transceiver 114. For example, the communication circuit 112 may include Fig.18 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Fig.18 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may 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 may send the information stored in the memory unit 130 to the outside (e.g., other communication devices) through the wireless / wired interface via the communication unit 110, or store in the memory unit 130 information received from the outside (e.g., other communication devices) through the wireless / wired interface via the communication unit 110.

[0366] The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the form of, but not limited to, a robot ( Fig.17 100a), vehicles ( Fig.17 100b-1 and 100b-2), XR devices ( Fig.17 100c), handheld device ( Fig.17 100d), household appliances ( Fig.17 100e), IoT devices ( Fig.17 100f), digital broadcasting terminal, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Fig.17 400), BS( Fig.17 200), network nodes, etc. The wireless device can be used in a mobile or fixed location according to the usage example / service.

[0367] exist Fig. 20 In the wireless devices 100 and 200, the entirety of the various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface, or at least a portion thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. Each element, component, unit / part and / or module within the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a collection of one or more processors. As an example, the control unit 120 may be configured by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory 130 may be configured 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.

[0368] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig. 20 .

[0369] Fig.21A 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), and a portable computer (e.g., a notebook). The handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT). Fig.21 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0370] Reference Fig.21 , 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. 20 Frame 110 to 130 / 140.

[0371] 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.

[0372] As an 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.

[0373] Fig. 22 A vehicle or autonomous vehicle based on an embodiment of the present disclosure is shown. The vehicle or autonomous vehicle can be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc. Fig. 22 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0374] Reference Fig. 22 , the vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Fig. 20 Frame 110 / 130 / 140.

[0375] The communication unit 110 may send and receive signals (e.g., data 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 enable the vehicle or autonomous vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a power system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100 and include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a depth sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement technology for maintaining the lane in which the vehicle is traveling, technology for automatically adjusting the speed (e.g., adaptive cruise control), technology for autonomously traveling along a determined path, technology for traveling by automatically setting a path if a destination is set, and the like.

[0376] 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 obtained data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous 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 obtain the latest traffic information data from the external server and obtain surrounding traffic information data from neighboring vehicles. In the middle of autonomous driving, the sensor unit 140c may obtain 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 obtained 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 based on information collected from the vehicle or autonomous vehicle using AI technology, etc., and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0377] The claims in this specification can be combined in various ways. For example, the technical features in the method claims of this specification can be combined to be implemented or performed in a device, and the technical features in the device claims can be combined to be implemented or performed in a method. In addition, the technical features in the method claims and the device claims can be combined to be implemented or performed in a device. In addition, the technical features in the method claims and the device claims can be combined to be implemented or performed in a method.

Claims

1. A method for performing wireless communication by a first device, the method comprising: triggering resource selection at a time slot; determining a time interval based on a remaining packet delay budget PDB from the time slot based on a trigger of the resource selection; Based on the sensing, selecting resources for sidelink SL transmission within the time interval; and performing channel sensing in an interval before a start time point of the resource according to a channel sensing interval, wherein the result of the channel sensing is busy, and The result of the channel sensing is delivered from a physical PHY layer of the first device to a medium access control MAC layer of the first device.

2. The method according to claim 1, wherein: The time interval is included in the channel occupancy time COT duration.

3. The method according to claim 2, further comprising: performing initial channel sensing; as well as The COT duration is determined based on a result of the initial channel sensing.

4. The method according to claim 3, wherein: The initial channel sensing is performed within a license-exempt frequency band.

5. The method according to claim 2, further comprising: Information related to the COT duration is obtained.

6. The method according to claim 2, further comprising: Sidelink control information SCI including information related to the COT duration is sent to the second device.

7. The method according to claim 2, wherein: The COT duration is included in the license-exempt frequency band.

8. The method according to claim 1, wherein: The sensing includes: receiving an SCI from a second device within a sensing interval; and The SCI is decoded.

9. The method according to claim 8, further comprising: determining an overlap of a channel sensing interval associated with a transmission resource of the second apparatus and a channel sensing interval associated with the resource included in the SCI; as well as The SL sending is performed based on that the priority associated with the sending resource is lower than the priority associated with the resource.

10. The method according to claim 8, further comprising: It is determined not to perform the SL transmission based on that the reference signal received power RSRP related to the SCI is greater than a threshold.

11. The method according to claim 1, further comprising: triggering resource reselection based on a result of the channel sensing, The resource reselection is triggered from a MAC layer of the first device.

12. The method according to claim 11, further comprising: The resource is reselected as a reselected resource based on the trigger for the resource reselection.

13. The method according to claim 12, further comprising: An SCI including information related to the reselected resource is sent to the second device.

14. A first device for performing wireless communication, the first device comprising: one or more memories storing instructions; one or more transceivers; as well as one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute instructions to: triggering resource selection at a time slot; determining a time interval based on a remaining packet delay budget PDB from the time slot based on a trigger of the resource selection; Based on the sensing, selecting resources for sidelink SL transmission within the time interval; and performing channel sensing in an interval before a start time point of the resource according to a channel sensing interval, wherein the result of the channel sensing is busy, and The result of the channel sensing is delivered from a physical PHY layer of the first device to a medium access control MAC layer of the first device.

15. An apparatus adapted to control a first user equipment UE, the apparatus comprising: one or more processors; as well as one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to: triggering resource selection at a time slot; determining a time interval based on a remaining packet delay budget PDB from the time slot based on a trigger of the resource selection; Based on the sensing, selecting resources for sidelink SL transmission within the time interval; and performing channel sensing in an interval before a start time point of the resource according to a channel sensing interval, wherein the result of the channel sensing is busy, and The result of the channel sensing is delivered from the physical PHY layer of the first UE to the medium access control MAC layer of the first UE.

16. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a first device to: triggering resource selection at a time slot; determining a time interval based on a remaining packet delay budget PDB from the time slot based on a trigger of the resource selection; Based on the sensing, selecting resources for sidelink SL transmission within the time interval; and performing channel sensing in an interval before a start time point of the resource according to a channel sensing interval, wherein the result of the channel sensing is busy, and The result of the channel sensing is delivered from a physical PHY layer of the first device to a medium access control MAC layer of the first device.

17. A method for performing wireless communication by a second device, the method comprising: receiving, based on the reselected resource, side link control information SCI including information related to the reselected resource from the first device; as well as performing side link SL reception based on the reselected resources, The reselected resource is reselected from the resource based on a trigger for resource reselection, The resource reselection is triggered by a medium access control (MAC) layer of the first device based on a result of channel sensing being busy. wherein the result of the channel sensing is delivered from the physical PHY layer of the first device to the MAC layer of the first device, wherein the resource is selected within a time interval based on sensing, and The time interval is determined based on a trigger of resource selection triggered at a time slot and based on a remaining packet delay budget PDB from the time slot.

18. The method according to claim 17, wherein: The time interval is included in the channel occupancy time COT duration.

19. A second device for performing wireless communication, the second device comprising: one or more memories storing instructions; one or more transceivers; as well as one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute instructions to: Based on the reselected resource, receiving side link control information SCI including information related to the reselected resource from the first device; and performing side link SL reception based on the reselected resources, The reselected resource is reselected from the resource based on a trigger for resource reselection, The resource reselection is triggered by a medium access control (MAC) layer of the first device based on a result of channel sensing being busy. wherein the result of the channel sensing is delivered from the physical PHY layer of the first device to the MAC layer of the first device, wherein the resource is selected within a time interval based on sensing, and The time interval is determined based on a trigger of resource selection triggered at a time slot and based on a remaining packet delay budget PDB from the time slot.

20. The second device according to claim 19, wherein: The time interval is included in the channel occupancy time COT duration.

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