Method and apparatus for performing resource reselection in NR V2X

Abstract

Provided are a method for a first device to perform wireless communication and a device for supporting the method. The method may include the following steps: performing first sensing within a first sensing window; selecting a first SL resource on a first time slot and a second SL resource on a second time slot based on the first sensing; determining a second sensing window based on requesting a preemption check for the second SL resource; determining a plurality of candidate resources based on the second sensing performed within the second sensing window, wherein, based on the first device not monitoring the first time slot, the second SL resource on the second time slot is excluded from the plurality of candidate resources based on the value of at least one resource reservation period configured for a resource pool; and determining, based on the second SL resource excluded from the plurality of candidate resources, whether to perform resource reselection based on preemption for the second SL resource excluded from the plurality of candidate resources based on a priority value associated with a first medium access control protocol data unit (MAC PDU).

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 equipments (UEs), and the UEs exchange voice and data directly with each other without the intervention of an evolved Node B (eNB). SL communication is being considered as a solution to the eNB overhead caused by the rapid growth of data traffic. V2X (Vehicle-to-Everything) refers to a communication technology used by vehicles to exchange information with other vehicles, pedestrians, and objects equipped with infrastructure. V2X can be divided into four types: V2V (Vehicle-to-Vehicle), V2I (Vehicle-to-Infrastructure), V2N (Vehicle-to-Network), and V2P (Vehicle-to-Pedestrian). V2X communication can be provided through the PC5 interface and / or the Uu interface.

[0003] In addition, as more and more communication devices require larger communication capacity, the demand for enhanced mobile broadband communication compared to traditional radio access technology (RAT) is increasing. Therefore, the design of communication systems that take into account UEs or services that are sensitive to reliability and latency has also been discussed. In addition, the next generation of radio access technologies based on enhanced mobile broadband communication, massive machine type communication (MTC), ultra-reliable low latency communication (URLLC), etc. can be referred to as new RAT (radio access technology) or NR (new radio). In this article, NR can also support vehicle-to-everything (V2X) communication.

[0004] Figure 1 This diagram describes NR-based V2X communication compared to V2X communication based on RATs used before NR. Figure 1 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0005] Regarding V2X communication, when discussing RATs used prior to NR, the focus is on solutions that provide safety services based on V2X messages such as BSM (Basic Safety Message), CAM (Cooperation Awareness Message), and DENM (Decentralized Environment Notification Message). V2X messages may include location information, dynamic information, attribute information, etc. For example, a UE may send a periodic CAM message type and / or an event-triggered DENM message type to another UE.

[0006] Since then, various V2X scenarios have been proposed for NR regarding V2X communications, including platooning, advanced driving, extended sensors, and remote driving. Summary of the Invention

[0007] Technical issues

[0008] Furthermore, when the UE determines whether to reselect the selected resource based on a preemption check or a reassessment check, if the UE reselects all resources in time slots starting from time slot N and located after the resource reservation period value configured in the resource pool due to the UE's inability to monitor time slot N, a problem may arise in which all periodically reserved resources should be reselected. Therefore, a method for solving the above problem and a device supporting the method must be proposed.

[0009] Technical Solution

[0010] In one embodiment, a method for performing wireless communication by a first device is provided. The method may include the following steps: performing first sensing within a first sensing window; selecting a first side link (SL) resource on a first time slot and a second SL resource on a second time slot based on the first sensing; determining a second sensing window based on a request for a preemption check of the second SL resource; determining a plurality of candidate resources based on the second sensing performed within the second sensing window, wherein, based on the first device not monitoring the first time slot, the second SL resource on the second time slot is excluded from the plurality of candidate resources based on at least one resource reservation period value configured for a resource pool; and determining whether to perform preemption-based resource reselection on the second SL resource excluded from the plurality of candidate resources based on a priority value associated with a first medium access control (MAC) protocol data unit (PDU) based on excluding the second SL resource from the plurality of candidate resources.

[0011] In an embodiment, a first device adapted to perform wireless communication is provided. The first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. The one or more processors may execute the instructions to: perform first sensing within a first sensing window; select a first side link (SL) resource on a first time slot and a second SL resource on a second time slot based on the first sensing; determine a second sensing window based on a request for a preemption check of the second SL resource; determine a plurality of candidate resources based on the second sensing performed within the second sensing window, wherein, based on the first device not monitoring the first time slot, the second SL resource on the second time slot is excluded from the plurality of candidate resources based on at least one resource reservation period value configured for a resource pool; and based on excluding the second SL resource from the plurality of candidate resources, determine whether to perform preemption-based resource reselection on the second SL resource excluded from the plurality of candidate resources based on a priority value associated with a first medium access control (MAC) protocol data unit (PDU).

[0012] Technical Effects

[0013] The user equipment (UE) can efficiently perform SL communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This diagram describes NR-based V2X communication compared to V2X communication based on RATs used before NR.

[0015] Figure 2 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0016] Figure 3 A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0017] Figure 4 The structure of the NR radio frame according to an embodiment of the present disclosure is shown.

[0018] Figure 5 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown.

[0019] Figure 6 An example of a BWP according to an embodiment of the present disclosure is shown.

[0020] Figure 7 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown.

[0021] Figure 8 A process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure is shown.

[0022] Figure 9 Three broadcast types are shown according to embodiments of the present disclosure.

[0023] Figure 10 The resource unit used for CBR measurement according to an embodiment of the present disclosure is shown.

[0024] Figure 11 A method according to an embodiment of the present disclosure is shown, in which a UE that has reserved transmission resources notifies another UE of the transmission resources.

[0025] Figure 12 A process for a UE to select resources within a selection window according to an embodiment of the present disclosure is shown.

[0026] Figure 13 A method for a UE to exclude specific resources within a selection window according to an embodiment of the present disclosure is shown.

[0027] Figure 14The following illustrates a process in which a base station according to an embodiment of the present disclosure performs size alignment on SL DCI.

[0028] Figure 15 A method of selecting resources within a selection window by considering time slots not monitored by a TX UE according to an embodiment of the present disclosure is shown.

[0029] Figure 16 A method for a first device to perform wireless communication according to an embodiment of the present disclosure is shown.

[0030] Figure 17 A communication system 1 according to an embodiment of the present disclosure is shown.

[0031] Figure 18 A wireless device according to an embodiment of the present disclosure is shown.

[0032] Figure 19 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0033] Figure 20 Another example of a wireless device according to an embodiment of the present disclosure is shown.

[0034] Figure 21 A handheld device according to an embodiment of the present disclosure is shown.

[0035] Figure 22 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0036] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, in the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in the present disclosure, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, and C".

[0037] As used in this disclosure, a slash ( / ) or a comma 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".

[0038] 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”.

[0039] 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.”

[0040] In addition, the brackets used in the present disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean that "PDCCH" is proposed 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". Specifically, when indicated as "control information (i.e., PDCCH)", this may also mean that "PDCCH" is proposed as an example of "control information".

[0041] The technical features described in each of the drawings in the present disclosure may be implemented separately or simultaneously.

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

[0043] 5G NR is a successor technology to LTE-A, a new mobile communication system with high performance, low latency, and high availability. 5G NR can use all available spectrum resources, including low-frequency bands below 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high-frequency bands (millimeter waves) above 24 GHz.

[0044] For clarity of description, the following description will mainly focus on LTE-A or 5G NR. However, the technical features according to the embodiments of the present disclosure are not limited thereto.

[0045] Figure 2 The structure of the NR system according to an embodiment of the present disclosure is shown. Figure 2 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0046] Reference Figure 2 , the next generation radio access network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol terminations for 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 by 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 by other terms such as a base transceiver system (BTS), an access point (AP), etc.

[0047] Figure 2 The embodiment of the present invention illustrates a case where only gNBs are included. BSs 20 may be connected to each other via an Xn interface. BSs 20 may be connected to each other via a fifth-generation (5G) core network (5GC) and an NG interface. More specifically, BSs 20 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.

[0048] The radio interface protocol layers between the UE and the network can be categorized as Layer 1 (L1), Layer 2 (L2), and Layer 3 (L3) based on the lower three layers of the Open Systems Interconnection (OSI) model, which is well known in communication systems. The physical (PHY) layer, belonging to Layer 1, provides information transfer services using physical channels, and the radio resource control (RRC) layer, located at Layer 3, controls radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the base station layer.

[0049] Figure 3 A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 3 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 3 (a) in FIG. 1 shows a radio protocol stack for the user plane of Uu communication, and Figure 3 (b) in FIG. 1 shows the radio protocol stack of the control plane for Uu communication. Figure 3 (c) in FIG. 1 shows a radio protocol stack for the user plane of SL communication, and Figure 3 (d) in FIG. 5 shows the radio protocol stack of the control plane for SL communication.

[0050] Reference Figure 3 The physical layer provides information transfer services to upper layers via physical channels. The physical layer is connected to the media access control (MAC) layer, which is the upper layer of the physical layer, via transport channels. Data is transferred between the MAC layer and the physical layer via transport channels. Transport channels are categorized based on how data is transmitted over the radio interface and the characteristics of the data being transmitted.

[0051] Data is transmitted between different physical layers (ie, a PHY layer of a transmitter and a PHY layer of a receiver) through a physical channel. The physical channel may be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme and uses time and frequency as radio resources.

[0052] The MAC layer provides services to the Radio Link Control (RLC) layer, a higher layer of the MAC layer, via logical channels. The MAC layer maps multiple logical channels to multiple transport channels. The MAC layer also provides logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data delivery services via logical channels.

[0053] The RLC layer performs concatenation, segmentation, and reassembly of radio link control service data units (RLC SDUs). To ensure the different quality of service (QoS) required for radio bearers (RBs), the RLC layer provides three types of operation modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM). AM RLC provides error correction through automatic repeat request (ARQ).

[0054] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer controls logical channels, transport channels, and physical channels associated with the configuration, reconfiguration, and release of resource allocation (RBs). RBs are logical paths for data delivery between the UE and the network, provided by Layer 1 (i.e., the physical or PHY layer) and Layer 2 (i.e., the MAC layer, RLC layer, Packet Data Convergence Protocol (PDCP), and Service Data Adaptation Protocol (SDAP) layers).

[0055] 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.

[0056] 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.

[0057] RB configuration refers to the process of specifying radio protocol layers and channel attributes to provide a specific service and determining corresponding detailed parameters and operation methods. RBs can be classified into two types: signaling radio bearers (SRBs) and data radio bearers (DRBs). SRBs are used as a path for transmitting RRC messages in the control plane, and DRBs are used as a path for transmitting user data in the user plane.

[0058] When an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state, otherwise the UE may be in the RRC idle (RRC_IDLE) state. In the case of NR, an RRC inactive (RRC_INACTIVE) state is additionally defined, and the UE in the RRC_IN ACTIVE state may maintain its connection with the core network while releasing its connection with the BS.

[0059] The downlink transport channels for sending (or transmitting) data from the network to the UE include the broadcast channel (BCH) for sending system information and the downlink shared channel (SCH) for sending other user traffic or control messages. Traffic or control messages for downlink multicast or broadcast services can be sent via the downlink SCH or can be sent via a separate downlink multicast channel (MCH). In addition, the uplink transport channels for sending (or transmitting) data from the UE to the network include the random access channel (RACH) for sending initial control messages and the uplink shared channel (SCH) for sending other user traffic or control messages.

[0060] Examples of logical channels belonging to a higher layer of a transport channel and mapped to a transport channel may include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

[0061] Figure 4 The structure of the NR radio frame according to an embodiment of the present disclosure is shown. Figure 4The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0062] Reference Figure 4 In NR, a radio frame can be used to perform uplink and downlink transmissions. The length of a radio frame is 10ms and can be defined as consisting of two half frames (HF). A half frame can include five 1ms subframes (SF). A subframe (SF) can be divided into one or more time slots, and the number of time slots within a subframe can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP).

[0063] When using a normal CP, each time slot can include 14 symbols. When using an extended CP, each time slot can 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).

[0064] Table 1 shown below shows the number of symbols (N) per time slot according to the SCS configuration (u) in the case of adopting a normal CP. 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 ).

[0065] [Table 1]

[0066] <![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

[0067] Table 2 shows an example of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS in the case of using the extended CP.

[0068] [Table 2]

[0069] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot <!-- 5 -->]]> 60KHz (u=2) 12 40 4

[0070] In the NR system, OFDM(A) parameter sets (e.g., SCS, CP length, etc.) may be configured differently between multiple cells integrated into one UE. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., subframe, time slot, or 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.

[0071] 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 frequency bands can be supported, and with an SCS of 30kHz / 60kHz, dense urban areas, 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.

[0072] The NR frequency band can 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).

[0073] [Table 3]

[0074] Frequency range specification Corresponding frequency range Subcarrier spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0075] As described above, the value of the frequency range in the NR system can 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. The unlicensed frequency bands may be used for various purposes, for example, the unlicensed frequency bands are used for vehicle-specific communications (e.g., autonomous driving).

[0076] [Table 4]

[0077] Frequency range specification Corresponding frequency range Subcarrier spacing (SCS) FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0078] Figure 5 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown. Figure 5 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0079] Reference Figure 5 A slot includes multiple symbols in the time domain. For example, in the case of normal CP, one slot may include 14 symbols. For example, in the case of extended CP, one slot may include 12 symbols. Alternatively, in the case of normal CP, one slot may include 7 symbols. However, in the case of extended CP, one slot may include 6 symbols.

[0080] 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 activated BWPs. 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.

[0081] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0082] 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.

[0083] For example, the BWP may be at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor the downlink radio link quality in DL BWPs other than the activated DL BWP on the primary cell (PCell). For example, the UE may not receive the PDCCH, physical downlink shared channel (PDSCH), or channel state information-reference signal (CSI-RS) (excluding RRM) outside the activated DL BWP. For example, the UE may not trigger channel state information (CSI) reporting for inactive DL BWPs. For example, the UE may not transmit the physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) outside the activated UL BWP. For example, in the downlink, the initial BWP may be given as a set of contiguous RBs for the remaining minimum system information (RMSI) control resource set (CORESET) (configured by the physical broadcast channel (PBCH)). For example, in the uplink, the initial BWP may be given by the system information block (SIB) for the random access procedure. For example, the default BWP may be configured by higher layers. 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 UE's active BWP to the default BWP.

[0084] 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 SL signal on a specific BWP, and a receiving UE can receive a SL channel or 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. The SLBWP is (pre-)configured in the carrier for out-of-coverage NR V2X UEs and RRC_IDLE UEs. For a UE in RRC_CONNECTED mode, at least one SL BWP can be activated in the carrier.

[0085] Figure 6 An example of a BWP according to an embodiment of the present disclosure is shown. Figure 6 The embodiments of can be combined with various embodiments of the present disclosure. Figure 6 In the embodiment of the present invention, the number of BWPs is 3.

[0086] Reference Figure 6 , Common Resource Blocks (CRBs) may be carrier resource blocks numbered from one end of the carrier frequency band to the other. Additionally, PRBs may be resource blocks numbered within each BWP. Point A may indicate a common reference point for the resource block grid.

[0087] It can be obtained by point A, the offset relative to point A (N start BWP ) and bandwidth (N size BWP ) to configure the BWP. For example, point A can be an external reference point of the PRBs of a carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) is aligned in point A. For example, the offset can be the PRB distance between the lowest subcarrier in a given parameter set and point A. For example, the bandwidth can be the number of PRBs in a given parameter set.

[0088] Hereinafter, V2X or SL communication will be described.

[0089] 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.

[0090] The physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for transmitting default (system) information, which must be known by the UE 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).

[0091] S-PSS, S-SSS and PSBCH can be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sidelink synchronization signal block (S-SSB)). The S-SSB can have the same parameter set (i.e., SCS and CP length) as the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in the carrier, and the transmission bandwidth can exist within the (pre-) configured sidelink (SL) BWP. For example, the S-SSB can have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH can exist across 11 RBs. In addition, the frequency position of the S-SSB can be (pre-) configured. Therefore, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0092] Figure 7 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown. Figure 7 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0093] Reference Figure 7In V2X or SL communication, the term "UE" generally refers to a user's UE. However, if a network device such as a base station (BS) transmits / receives signals according to a communication scheme between UEs, the BS may also be considered a type of UE. For example, UE 1 may be first device 100, and UE 2 may be second device 200.

[0094] For example, UE 1 can select a resource unit corresponding to a specific resource from a resource pool representing a set of resources. Furthermore, UE 1 can transmit an SL signal using the resource unit. For example, a resource pool in which UE 1 can transmit a signal can be configured for UE 2, which is a receiving UE, and UE 1's signal can be detected in the resource pool.

[0095] Here, if UE 1 is within the connection range of the BS, the BS can inform UE 1 of the resource pool. Otherwise, if UE 1 is out of the connection range of the BS, another UE can inform UE 1 of the resource pool, or UE 1 can use a pre-configured resource pool.

[0096] Generally, a resource pool may be configured in units of multiple resources, and each UE may select one or more units of resources to use in its SL signaling.

[0097] Hereinafter, resource allocation in SL will be described.

[0098] Figure 8 A process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure is shown. Figure 8 The embodiments of the present disclosure may be combined with the various embodiments of the present disclosure. In the 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 the LTE transmission mode. In NR, the transmission mode may be referred to as the NR resource allocation mode.

[0099] For example, Figure 8 (a) in FIG. 1 shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 8 (a) in FIG. 4 shows UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to conventional SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0100] For example, Figure 8 (b) in FIG. 4 shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 (b) in FIG. 4 shows UE operations related to NR resource allocation mode 2.

[0101] Reference Figure 8 In (a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS may schedule SL resources to be used by the UE for SL transmission. For example, the BS may perform resource scheduling for UE 1 through PDCCH (e.g., downlink control information (DCI)) or RRC signaling (e.g., configuration grant type 1 or configuration grant type 2), and UE 1 may perform V2X or SL communication with respect to UE 2 according to the resource scheduling. For example, UE 1 may transmit sidelink control information (SCI) to UE 2 through a physical sidelink control channel (PSCCH), and thereafter transmit data based on the SCI to UE 2 through a physical sidelink shared channel (PSSCH).

[0102] Reference Figure 8 (b) in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the BS / network or the pre-configured SL resources. For example, the configured SL resources or the pre-configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources in the configured resource pool. For example, the UE can autonomously select resources within the selection window by performing sensing and resource (re)selection processes. For example, sensing can be performed in units of subchannels. In addition, UE 1, which has autonomously selected resources in the resource pool, can send SCI to UE 2 via PSCCH, and thereafter send data based on the SCI to UE 2 via PSSCH.

[0103] Figure 9 Three broadcast types are shown in accordance with embodiments of the present disclosure. Figure 9 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 9 (a) shows a broadcast type SL communication, Figure 9 (b) in FIG. 4 shows unicast type SL communication, and Figure 9 (c) in FIG. 5 shows multicast SL communication. In the case of unicast SL communication, the UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0104] Hereinafter, side link (SL) congestion control will be described.

[0105] If the UE autonomously determines the SL transmission resources, it also autonomously determines the size and frequency of the resources used by the UE. Of course, due to constraints from the network, etc., the use of resource sizes or usage frequencies greater than or equal to a certain level may be limited. However, if many UEs are concentrated in a specific area at a specific time, all UEs use a relatively large amount of resources, and the overall performance may be significantly degraded due to mutual interference.

[0106] Therefore, the UE may need to observe the channel situation. If it is determined that an excessive amount of resources are consumed, it is preferred that the UE autonomously reduce the use of resources. In the present disclosure, this can be defined as congestion control (CR). For example, the UE can determine whether the energy measured in the unit time / frequency resource is greater than or equal to a specific level, and can adjust the amount and frequency of use of its transmission resources based on the ratio of the unit time / frequency resources in which energy greater than or equal to the specific level is observed. In the present disclosure, the ratio of the time / frequency resources in which energy greater than or equal to the specific level is observed can be defined as the channel busy rate (CBR). The UE can measure the CBR of the channel / frequency. In addition, the UE can send the measured CBR to the network / BS.

[0107] Figure 10 The resource unit used for CBR measurement according to an embodiment of the present disclosure is shown. Figure 10 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0108] Reference Figure 10 As a result of the UE measuring RSSI based on the subchannel within a specific period (e.g., 100ms), the CBR may indicate the number of subchannels in which the measurement result value of the received signal strength indicator (RSSI) has a value greater than or equal to a preconfigured threshold. Alternatively, the CBR may indicate the ratio of subchannels having a value greater than or equal to the preconfigured threshold among the subchannels within a specific duration. For example, Figure 10 In an embodiment of the present invention, if it is assumed that a shadowed subchannel is a subchannel having a value greater than or equal to a preconfigured threshold, the CBR may represent the ratio of shadowed subchannels within a 100 ms period. In addition, the CBR may be reported to the BS.

[0109] In addition, congestion control that takes into account the priority of the service (e.g., packet) may be necessary. To this end, for example, the UE may measure the channel occupancy ratio (CR). Specifically, the UE may measure the CBR, and the UE may determine the maximum value CRlimitk of the channel occupancy k (CR k) that may be occupied by the traffic corresponding to each priority (e.g., k) based on the CBR. For example, the UE may derive the maximum value CRlimitk of the channel occupancy related to the priority of each traffic based on a predetermined table of CBR measurement values. For example, in the case of a service with a relatively high priority, the UE may derive a relatively large maximum value of the channel occupancy. Thereafter, the UE may perform congestion control by limiting the sum of the channel occupancies of the traffic whose priority k is lower than i to a value less than or equal to a specific value. Based on this method, the channel occupancy can be more strictly limited for services with relatively low priority.

[0110] In addition to this, the UE can perform SL congestion control by using adjusting the transmission power level, dropping packets, determining whether to perform retransmission, adjusting the transmission RB size (MCS coordination), etc.

[0111] Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.

[0112] In the case of SL unicast and multicast, HARQ feedback and HARQ combining in the physical layer can be supported. For example, when the receiving UE operates in resource allocation mode 1 or 2, the receiving UE can receive PSSCH from the transmitting UE, and the receiving UE can send HARQ feedback corresponding to PSSCH to the transmitting UE using the sidelink feedback control information (SFCI) format through the physical sidelink feedback channel (PSFCH).

[0113] For example, SL HARQ feedback may be enabled for unicast. In this case, in non-code block group (non-CBG) operation, the receiving UE may decode the PSCCH targeted at the receiving UE, and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may generate a HARQ-ACK. Thereafter, the receiving UE may send the HARQ-ACK to the transmitting UE. Conversely, after the receiving UE decodes the PSCCH targeted at the receiving UE, if the receiving UE fails to successfully decode the transport block associated with the PSCCH, the receiving UE may generate a HARQ-NACK, and the receiving UE may send the HARQ-NACK to the transmitting UE.

[0114] For example, SL HARQ feedback may be enabled for multicast.For example, during non-CBG periods, two different types of HARQ feedback options may be supported for multicast.

[0115] (1) Multicast Option 1: After decoding the PSCCH targeted at the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Conversely, when the receiving UE decodes the PSCCH targeted at the receiving UE and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE does not send a HARQ-NACK to the transmitting UE.

[0116] (2) Multicast Option 2: After decoding the PSCCH targeted at the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Furthermore, when the receiving UE decodes the PSCCH targeted at the receiving UE and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may send a HARQ-ACK to the transmitting UE via the PSFCH.

[0117] For example, if multicast option 1 is used in SL HARQ feedback, all UEs performing multicast communication can share PSFCH resources. For example, UEs belonging to the same group can send HARQ feedback by using the same PSFCH resources.

[0118] For example, if multicast option 2 is used in SL HARQ feedback, each UE performing multicast communication can use different PSFCH resources for HARQ feedback transmission. For example, UEs belonging to the same group can send HARQ feedback by using different PSFCH resources.

[0119] For example, when SL HARQ feedback is enabled for multicast, the receiving UE may determine whether to send HARQ feedback to the transmitting UE based on transmit-receive (TX-RX) distance and / or reference signal received power (RSRP).

[0120] For example, in multicast option 1, in the case of HARQ feedback based on TX-RX distance, if the TX-RX distance is less than or equal to the communication range requirement, the receiving UE may send HARQ feedback in response to the PSSCH to the transmitting UE. Otherwise, if the TX-RX distance is greater than the communication range requirement, the receiving UE may not send HARQ feedback in response to the PSSCH to the transmitting UE. For example, the transmitting UE may inform the receiving UE of the location of the transmitting UE via the SCI associated with the PSSCH. For example, the SCI associated with the PSSCH may be a second SCI. For example, the receiving UE may estimate or obtain the TX-RX distance based on the location of the receiving UE and the location of the transmitting UE. For example, the receiving UE may decode the SCI associated with the PSSCH and therefore may know the communication range requirement for the PSSCH.

[0121] For example, in the case of resource allocation mode 1, the time (offset) between PSFCH and PSSCH can be configured or pre-configured. In the case of unicast and multicast, if retransmission is necessary on SL, it can be indicated to the BS by the UE within the coverage area using PUCCH. The sending UE can send an indication to the serving BS of the sending UE in the form of a scheduling request (SR) / buffer status report (BSR) instead of a HARQ ACK / NACK. In addition, even if the BS does not receive the indication, the BS can schedule SL retransmission resources for the UE. For example, in the case of resource allocation mode 2, the time (offset) between PSFCH and PSSCH can be configured or pre-configured.

[0122] For example, from the perspective of UE transmission within a carrier, for a PSFCH format used for a SL in a time slot, TDM between the PSCCH / PSSCH and the PSFCH can be allowed. For example, a sequence-based PSFCH format with a single symbol can be supported. In this context, the single symbol may not be the AGC duration. For example, a sequence-based PSFCH format can be applied to both unicast and multicast.

[0123] For example, in a time slot associated with a resource pool, the PSFCH resource may be periodically configured to have a duration of N time slots, or may be pre-configured. For example, N may be configured to be one or more values ​​greater than or equal to 1. For example, N may be 1, 2, or 4. For example, HARQ feedback for transmissions in a specific resource pool may be sent via the PSFCH only on the specific resource pool.

[0124] For example, if a transmitting UE transmits a PSSCH to a receiving UE across time slot #x to time slot #n, the receiving UE may transmit HARQ feedback in response to the PSSCH to the transmitting UE in time slot #(N+A). For example, time slot #(N+A) may include PSFCH resources. Herein, for example, A may be a minimum integer greater than or equal to K. For example, K may be the number of logical time slots. In this case, K may be the number of time slots in a resource pool. Alternatively, for example, K may be the number of physical time slots. In this case, K may be the number of time slots inside or outside the resource pool.

[0125] For example, if a receiving UE sends HARQ feedback on a PSFCH resource in response to a PSSCH sent by a transmitting UE to the receiving UE, the receiving UE may determine the frequency domain and / or code domain of the PSFCH resource based on an implicit mechanism in the configured resource pool. For example, the receiving UE may determine the frequency domain and / or code domain of the PSFCH resource based on at least one of a slot index associated with the PSCCH / PSSCH / PSFCH, a subchannel associated with the PSCCH / PSSCH, or an identifier for each receiving UE in a group for identifying HARQ feedback based on multicast option 2. Additionally / alternatively, for example, the receiving UE may determine the frequency domain and / or code domain of the PSFCH resource based on at least one of SL RSRP, SINR, L1 source ID, and / or location information.

[0126] For example, if HARQ feedback transmission via the UE's PSFCH overlaps with HARQ feedback reception via the PSFCH, the UE may select either HARQ feedback transmission via the PSFCH or HARQ feedback reception via the PSFCH based on a priority rule. For example, the priority rule may be based on at least a priority indication of the related PSCCH / PSSCH.

[0127] For example, if HARQ feedback transmissions by UEs via PSFCH overlap for multiple UEs, the UEs may select a specific HARQ feedback transmission based on a priority rule, for example, the priority rule may be based on the lowest priority indication of the related PSCCH / PSSCH.

[0128] In addition, in the present disclosure, a transmitting UE (i.e., TX UE) may be a UE that transmits data to a (target) receiving UE (i.e., RX UE). For example, the TX UE may be a UE that performs PSCCH transmission and / or PSSCH transmission. For example, the TX UE may be a UE that sends a SL CSI-RS and / or a SL CSI report request indicator to a (target) RX UE. For example, the TX UE may be a UE that sends a (predefined) reference signal (e.g., PSSCH demodulation reference signal (DM-RS)) and / or a SL (L1) RSRP report request indicator to a (target) RX UE for SL (L1) RSRP measurement. For example, the TX UE may be a UE that sends a (control) channel (e.g., PSCCH, PSSC H, etc.) and / or a reference signal on a (control) channel (e.g., DM-RS, CSI-RS) for SL radio link monitoring (RLM) operation and / or SL radio link failure (RLF) operation of the (target) RX UE.

[0129] In addition, in the present disclosure, a receiving UE (i.e., RX UE) may be a UE that sends SL HARQ feedback to a transmitting UE (i.e., TX UE) based on whether decoding of data received from the TX UE is successful and / or whether detection / decoding of a PSCCH (related to PSSCH scheduling) sent by the TX UE is successful. For example, the RX UE may be a UE that performs SL CSI transmission to the TX UE based on the SL CSI-RS and / or SL CSI report request indicator received from the TX UE. For example, the RX UE may be a UE that sends an SL (L1) RSRP measurement value measured based on a (predefined) reference signal and / or an SL (L1) RSRP report request indicator received from the TX UE to the TX UE. For example, the RX UE may be a UE that sends data of the RX UE to the TX UE. For example, the RX UE may be a UE that performs SL RLM operation and / or SL RLF operation based on a (preconfigured) (control) channel and / or a reference signal on the (control) channel received from the TX UE.

[0130] In addition, in the present disclosure, the TX UE may transmit all or part of the following information to the RX UE via the SCI. Herein, for example, the TX UE may transmit all or part of the following information to the RX UE via the first SCI and / or the second SCI.

[0131] -PSSCH (and / or PSCCH) related resource allocation information (e.g., location / number of time / frequency resources, resource reservation information (e.g., period))

[0132] -SL CSI report request indicator or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) report request indicator

[0133] -SL CSI transmission indicator (or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) information transmission indicator) (on PSSCH)

[0134] - Modulation and Coding Scheme (MCS) information

[0135] - Transmit power information

[0136] - L1 destination ID information and / or L1 source ID information

[0137] -SL HARQ process ID information

[0138] -New Data Indicator (NDI) information

[0139] - Redundancy Version (RV) information

[0140] -QoS information (for example, priority information) (related to the transmission service / packet)

[0141] - Information on the number of antenna ports used for (transmitting) SL CSI-RS or SL CSI-RS transmission indicator

[0142] - Target RX UE location (or distance range) information or TX UE location information (for which SL HARQ feedback is requested)

[0143] Reference signal (e.g., DM-RS, etc.) information related to decoding and / or channel estimation of data to be transmitted through the PSSCH. For example, the reference signal information may include information related to the pattern of (time-frequency) mapping resources of the DM-RS, rank information, antenna port index information, information about the number of antenna ports, etc.

[0144] In addition, in the present disclosure, for example, the PSCCH may be replaced / replaced with at least one of the SCI, the first SCI (first-level SCI), and / or the second SCI (second-level SCI), or vice versa. For example, the SCI may be replaced / replaced with at least one of the PSCCH, the first SCI, and / or the second SCI, or vice versa. For example, the PSSCH may be replaced / replaced with the second SCI and / or the PSCCH, or vice versa.

[0145] In addition, in the present disclosure, for example, if the SCI configuration field is divided into two groups in consideration of the (relatively) high SCI payload size, the SCI including the first SCI configuration field group may be referred to as the first SCI or first-level SCI, and the SCI including the second SCI configuration field group may be referred to as the second SCI or second-level SCI. For example, the first SCI and the second SCI may be sent via different channels. For example, the transmitting UE may send the first SCI to the receiving UE via the PSCCH. For example, the second SCI may be sent to the receiving UE via the (independent) PSCCH, or may be sent in a piggyback manner with the data via the PSSCH.

[0146] In addition, in the present disclosure, for example, "configured / configured" or "defined / defined" may refer to (pre-)configuration from a base station or a network. For example, "configured / configured" or "defined / defined" may refer to (pre-)configuration from a base station or a network for each resource pool. For example, the base station or the network may send information related to "configuration" or "definition" to the UE. For example, the base station or the network may send information related to "configuration" or "definition" to the UE via predefined signaling. For example, the predefined signaling may include at least one of RRC signaling, MAC signaling, PHY signaling, and / or SIB.

[0147] Furthermore, in the present disclosure, for example, "configured / configured" or "defined / defined" may refer to being specified or configured through pre-configuration signaling between UEs. For example, information related to "configuration" or "definition" may be sent or received between UEs through pre-configuration signaling. For example, pre-defined signaling may include at least one of RRC signaling, MAC signaling, PHY signaling, and / or SIB.

[0148] Furthermore, in the present disclosure, for example, RLF may be replaced / replaced with Out of Synchronization (OOS) and / or In Synchronization (IS), or vice versa.

[0149] In addition, in the present disclosure, for example, a resource block (RB) may be replaced / replaced with a subcarrier, or vice versa. For example, a packet or service may be replaced / replaced with a transport block (TB) or a media access control protocol data unit (MAC PDU) according to the transport layer, or vice versa. For example, a code block group (CBG) may be replaced / replaced with a TB, or vice versa. For example, a source ID may be replaced / replaced with a destination ID, or vice versa. For example, an L1 ID may be replaced / replaced with an L2 ID, or vice versa. For example, an L1 ID may be an L1 source ID or an L1 destination ID. For example, an L2 ID may be an L2 source ID or an L2 destination ID.

[0150] Furthermore, in the present disclosure, for example, the operation of the TX UE reserving / selecting / determining retransmission resources may include the operation of the TX UE reserving / selecting / determining potential retransmission resources, where whether to actually use is determined based on SL HARQ feedback information received from the RX UE.

[0151] Furthermore, in the present disclosure, a sub-selection window may be exchanged / replaced with a selection window and / or a preconfigured number of resource sets within the selection window, or vice versa.

[0152] In addition, in the present disclosure, SL Mode 1 may refer to a resource allocation method or a communication method in which a base station directly schedules SL transmission resources for a TX UE through predefined signaling (e.g., DCI or RRC message). For example, SL Mode 2 may refer to a resource allocation method or a communication method in which a UE independently selects SL transmission resources from a resource pool preconfigured or configured from a base station or a network. For example, a UE that performs SL communication based on SL Mode 1 may be referred to as a Mode 1 UE or a Mode 1 TX UE, and a UE that performs SL communication based on SL Mode 2 may be referred to as a Mode 2 UE or a Mode 2 TX UE.

[0153] In addition, in the present disclosure, for example, a dynamic grant (DG) may be replaced / replaced with a configuration grant (CG) and / or a semi-persistent scheduling (SPS) grant, or vice versa. For example, the DG may be replaced / replaced with a combination of a CG and an SPS grant, or vice versa. For example, the CG may include at least one of a configuration grant (CG) type 1 and / or a configuration grant (CG) type 2. For example, in CG type 1, the grant may be provided through RRC signaling and may be stored as a configuration grant. For example, in CG type 2, the grant may be provided through PDCCH and may be stored or deleted as a configuration grant based on L1 signaling indicating activation or deactivation of the grant. For example, in CG type 1, the base station may allocate periodic resources to the TX UE through an RRC message. For example, in CG type 2, the base station may allocate periodic resources to the TX UE through an RRC message, and the base station may dynamically activate or deactivate the periodic resources through DCI.

[0154] Furthermore, in the present disclosure, a channel may be replaced / replaced with a signal, or vice versa. For example, the transmission / reception of a channel may include the transmission / reception of a signal. For example, the transmission / reception of a signal may include the transmission / reception of a channel. For example, a broadcast may be replaced / replaced with at least one of unicast, multicast, and / or broadcast, or vice versa. For example, a broadcast type may be replaced / replaced with at least one of unicast, multicast, and / or broadcast, or vice versa. For example, a broadcast or broadcast type may include unicast, multicast, and / or broadcast.

[0155] Furthermore, in the present disclosure, a resource may be exchanged / replaced with a time slot or a symbol, or vice versa. For example, a resource may include a time slot and / or a symbol.

[0156] Furthermore, in the present disclosure, priority may be replaced / replaced with at least one of logical channel prioritization (LCP), latency, reliability, minimum required communication range, ProSe per-packet priority (PPP), sidelink radio bearer (SLRB), QoS profile, QoS parameters and / or requirements, or vice versa.

[0157] Furthermore, in the present disclosure, for example, for convenience of description, a (physical) channel used when an RX UE transmits at least one of the following information to a TX UE may be referred to as a PSFCH.

[0158] -SL HARQ feedback, SL CSI, SL (L1) RSRP

[0159] In addition, in the present disclosure, Uu channels may include UL channels and / or DL ​​channels. For example, UL channels may include PUSCH, PUCCH, Sounding Reference Signal (SRS), etc. For example, DL channels may include PDCCH, PDSCH, PSS / SSS, etc. For example, SL channels may include PSCCH, PSSCH, PSFCH, PSBCH, P SSS / SSSS, etc.

[0160] In addition, in the present disclosure, the sidelink information may include at least one of a sidelink message, a sidelink packet, a sidelink service, a sidelink data, a sidelink control information, and / or a sidelink transport block (TB). For example, the sidelink information may be sent via the PSSCH and / or the PSCCH.

[0161] Furthermore, in the present disclosure, high priority may mean a small priority value, and low priority may mean a large priority value. For example, Table 5 shows an example of priority.

[0162] [Table 5]

[0163] Service or logical channel Priority value Service A or Logical Channel A 1 Service B or Logical Channel B 2 Service C or Logical Channel C 3

[0164] Referring to Table 5, for example, service A or logical channel A associated with the smallest priority value may have the highest priority. For example, service C or logical channel C associated with the largest priority value may have the lowest priority.

[0165] In addition, in NR V2X communication or NR sidelink communication, the transmitting UE can reserve / select one or more transmission resources for sidelink transmission (e.g., initial transmission and / or retransmission), and the transmitting UE can send information about the location of one or more transmission resources to the receiving UE.

[0166] In addition, when performing sidelink communication, a method in which the transmitting UE reserves or predetermines transmission resources for the receiving UE may be representatively as follows.

[0167] For example, the transmitting UE may perform reservation of transmission resources based on a chain. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE may send the location information of less than K transmission resources to the receiving UE through an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, for example, the SCI may include the location information of less than K transmission resources. Alternatively, for example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE may send the location information of less than K transmission resources to the receiving UE through an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI may include the location information of less than K transmission resources. In this case, for example, by signaling the location information of less than K transmission resources to the receiving UE via only one SCI sent by the transmitting UE at any (or specific) transmission time or time resource, performance degradation due to an excessive increase in the payload of the SCI may be prevented.

[0168] Figure 11 A method in which a UE having reserved transmission resources notifies another UE of the transmission resources according to an embodiment of the present disclosure is shown. Figure 11 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0169] Specifically, for example, Figure 11 (a) shows a method for performing chain-based resource reservation by a transmitting UE by transmitting / signaling location information of (maximum) 2 transmission resources to a receiving UE via one SCI in the case of a value of K=4. For example, Figure 11 (b) shows a method for performing chain-based resource reservation by a transmitting UE by transmitting / signaling location information of (maximum) 3 transmission resources to a receiving UE via one SCI in the case of a value of K=4. Figure 11 (a) and (b), the transmitting UE may transmit / signal only the location information of the fourth transmission-related resource to the receiving UE via the fourth (or last) transmission-related PSCCH. Figure 11 (a), the transmitting UE may transmit / signal not only the location information of the fourth transmission-related resource but also the location information of the third transmission-related resource to the receiving UE via the fourth (or last) transmission-related PSCCH. Figure 11(b), the transmitting UE may transmit / signal not only the location information of the fourth transmission-related resource but also the location information of the second transmission-related resource and the location information of the third transmission-related resource to the receiving UE through the fourth (or last) transmission-related PSCCH. In this case, for example, Figure 11 In (a) and (b), if the transmitting UE can transmit / signal only the location information of the fourth transmission-related resources to the receiving UE through the fourth (or last) transmission-related PSCCH, the transmitting UE can set or designate the field / bit of the location information of the unused or remaining transmission resources to a preconfigured value (e.g., 0). Figure 11 In (a) and (b), if the sending UE can send / signal only the location information of the fourth transmission-related resources to the receiving UE through the fourth (or last) transmission-related PSCCH, the sending UE can set or designate the field / bit of the location information of the unused or remaining transmission resources to a preconfigured state / bit value indicating / representing the last transmission (among the 4 transmissions).

[0170] In addition, for example, the transmitting UE may perform reservation of transmission resources on a block basis. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE may send the location information of the K transmission resources to the receiving UE through an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI may include the location information of the K transmission resources. For example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE may send the location information of the K transmission resources to the receiving UE through an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI may include the location information of the K transmission resources. For example, Figure 11 (c) shows a method of performing block-based resource reservation by a transmitting UE by signaling location information of four transmission resources to a receiving UE via one SCI in the case of a value of K=4.

[0171] Based on the embodiments of the present disclosure, the base station / network may configure or preconfigure the UE so that (part of) the following parameters are maintained the same between multiple (reserved) transmission resources associated with a specific TB. Here, for example, the UE may maintain / configure (part of) the following parameters to be the same between multiple (reserved) transmission resources associated with a specific TB. For example, the base station / network may configure or preconfigure the UE so that (part of) the following parameters are maintained the same between transmission resources scheduled / reserved by (one) SCI. Here, for example, the UE may maintain / configure (part of) the following parameters to be the same between transmission resources scheduled / reserved by (one) SCI. For example, the parameters may include at least one of the following: (i) MCS value, (ii) RV value, (iii) NDI value, and / or (iv) the number of REs associated with the mapping of the second SCI and / or a parameter for determining the (effective) coding rate (e.g., beta offset).

[0172] Here, for example, whether to apply or enable a corresponding rule can be configured differently (or restrictively) for a UE based on a resource pool. For example, whether to apply or enable a corresponding rule can be configured differently (or restrictively) for a UE based on a service type. For example, whether to apply or enable a corresponding rule can be configured differently (or restrictively) for a UE based on a service priority. For example, whether to apply or enable a corresponding rule can be configured differently (or restrictively) for a UE based on a QoS requirement (e.g., latency, reliability). For example, whether to apply or enable a corresponding rule can be configured differently (or restrictively) for a UE based on a broadcast type (e.g., unicast, multicast, broadcast). For example, whether to apply or enable a corresponding rule can be configured differently (or restrictively) for a UE based on a HARQ feedback option (e.g., NACK-only feedback (based on TX-RX distance) or ACK / NACK feedback). For example, whether to apply or enable a corresponding rule can be configured differently (or restrictively) for a UE based on HARQ (feedback) enabled TB or HARQ (feedback) disabled TB. For example, whether to apply or enable a corresponding rule may be configured differently (or restrictively) for a UE based on a (resource pool-related) congestion level. For example, whether to apply or enable a corresponding rule may be configured differently (or restrictively) for a UE based on a periodic resource reservation method (based on a backward indication) or a chain-based resource reservation method (without a backward indication). For example, whether to apply or enable a corresponding rule may be configured differently (or restrictively) for a UE based on a maximum number of transmission resources (e.g., 2) that can be signaled via a (preconfigured) SCI.

[0173] For example, when the above rules are applied, the RX UE may be configured to perform HARQ combining of the PSSCH on the relevant scheduled / reserved resources or data. Specifically, for example, when the above rules are applied, even if the RX UE that succeeded in decoding the SCI fails (partially) in decoding each associated (additional) SCI, it may be configured to enable HARQ combining of the PSSCH on the scheduled / reserved resources associated with the SCI or data.

[0174] For example, when the size of the frequency resources of a specific subchannel constituting the resource pool is larger or smaller than the size of the frequency resources of other subchannels, it can be configured as an exception so that the above-mentioned rules are not applied. For convenience of explanation, when the size of the frequency resources of a specific subchannel constituting the resource pool is larger or smaller than the size of the frequency resources of other subchannels, the subchannel can be referred to as UNNOR_SB. For example, when UNNOR_SB is included in multiple (reserved) transmission resources associated with a specific TB, it can be configured as an exception so that the above-mentioned rules are not applied. For example, when UNNOR_SB is included in transmission resources scheduled / reserved by (one) SCI, it can be configured as an exception so that the above-mentioned rules are not applied. In this way, for example, even if UNNOR_SB is included in multiple (reserved) transmission resources associated with a specific TB, the UE can maintain the same TB size. In addition, for example, even if UNNOR_SB is included in transmission resources scheduled / reserved by (one) SCI, the UE can maintain the same TB size.

[0175] For example, between specific TB-related (reserved) transmission resources where chain-based signaling is stopped, it can be configured as an exception so that the above-mentioned rules are not applied. For example, between the (re)transmission resources after HARQ feedback (e.g., NACK) (via PSFCH) and the (re)transmission resources before HARQ feedback, it can be configured as an exception so that the above-mentioned rules are not applied. For example, between the (re)transmission resources after the time point when DTX occurs (e.g., the situation where the RX UE does not perform PSFCH transmission due to PSCCH decoding failure) and the (re)transmission resources before the time point when DTX occurs, it can be configured as an exception so that the above-mentioned rules are not applied.

[0176] Based on the embodiments of the present disclosure, the parameter set related to the bitmap for the resource pool (e.g., the bitmap applied to the resource pool) and / or the granularity of the bitmap application for the resource pool can be configured to be the same as the (reference) parameter set related to the TDD configuration on the PSBCH. For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured to be the same as the (reference) parameter set related to the signaling of the number of UL time slots on the PSBCH. For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured to be the same as the (reference) parameter set for UL (related to Uu communication). For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured to be the same as the (reference) parameter set for DL ​​(related to Uu communication). For example, the parameter set may include subcarrier spacing, CP length, CP type, etc.

[0177] For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured differently from the (reference) parameter set related to the TDD configuration on the PSBCH. For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured differently from the (reference) parameter set related to the signaling of the number of UL time slots on the PS BCH. For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured differently from the (reference) parameter set for UL (related to Uu communication). For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured differently from the (reference) parameter set for DL ​​(related to Uu communication). For example, the parameter set may include subcarrier spacing, CP length, CP type, etc.

[0178] Based on the embodiments of the present disclosure, when the number of RBs included in one subchannel is configured to be equal to the number of PSCC HRBs, the base station / network may not configure the UE with a pattern of PSSCH DMRS and / or the number of PSSCH DMRSs that have problems in mapping the second SCI (specific to the resource pool). For example, when the number of RBs included in one subchannel is configured to be equal to the number of PSCCH RBs, the UE may expect / determine that the base station / network does not configure the UE with a pattern of PSSCH DMRS and / or the number of PSSCH DMRSs that have problems in mapping the second SCI (specific to the resource pool). For example, the pattern of PSSCH DMRS and / or the number of PSSCH DMRS may be parameters related to the time domain of the DMRS mapped on the PSSCH resources. For example, when the number of RBs included in a subchannel is configured to be equal to the number of PSCCH RBs, even if the base station / network configures the UE (specific to the resource pool) with a problem in the mapping of the second SCI in the candidate pattern of the PSSCH DMRS and / or the candidate number of the PSSCH DMRS, the UE may not select / use the problem in the mapping of the second SCI in the candidate pattern of the PSSCH DMRS and / or the candidate number of the PSSCH DMRS. Here, for example, the UE may be configured to (substantially) map the second SCI in frequency first and time second starting from the first DMRS symbol (hereinafter, FRT_DMSYM) related to the PSSCH (e.g., including REs other than DMRS REs). For example, after sequentially mapping the second SCI on #(FRT_DMSYM), the UE may map the second SCI on #(FRT_DMSY M+1). Thereafter, based on the same rule, the UE may map the second SCI on #(FRT_DMSYM+N). Here, N may be a positive integer.

[0179] For example, when the UE performs mapping of the second SCI based on the pattern of PSSCH DMRS and / or the number of PSSCH DMRS, if FRT_DMSYM is truncated (completely or partially) by the PSCCH RB, the PSSCH DMRS pattern and / or the number of PSSCH DMRS can be determined / considered to be the PSSCH DMRS pattern and / or the number of PSSCH DMRS that has problems in mapping the second SCI. For example, when the UE performs mapping of the second SCI based on the pattern of PSSCH DMRS and / or the number of PSSCH DMRS, if the (earliest in the time domain) PSSCH DMRS that is not truncated (completely or partially) by the PSCCH RB exists after a preconfigured threshold position within the PSSCH duration, the PSSCH DMRS pattern and / or the number of PSSCH DMRS can be determined / considered to be the PSSCH DMRS pattern and / or the number of PSSCH DMRS that has problems in mapping the second SCI. For example, when the UE performs mapping of the second SCI based on the pattern of the PSSCH DMRS and / or the number of PSSCH DMRS, if the number of decoded (or remaining) PSSCH DMRS for the second SCI is less than a preconfigured threshold, the PSSCH DMRS pattern and / or the number of PSSCH DMRS can be determined / considered to be the PSSCH DMRS pattern and / or the number of PSSCH DMRS that is problematic in the mapping of the second SCI.

[0180] For example, the proposed rules can only be applied (restrictively) when TB transmission is performed through one subchannel. Here, for example, in this case, the UE can be configured to map the second SCI in the opposite direction from the last symbol associated with the PSSCH. For example, in this case, the UE can be configured to map the second SCI in the opposite direction from the last symbol associated with the PSSCH in the form of frequency first and time second. For example, the last symbol can be the last DMRS symbol or the last data symbol.

[0181] According to an embodiment of the present disclosure, when a TX UE uses resources on a PSFCH slot (e.g., a slot including PSFCH resources) and a NON-PSFCH slot (e.g., a slot not including PSFCH resources), if the TX UE cannot maintain the same (PSSCH) TB size between initial transmission and retransmission, the TX UE can be configured to perform transmission resource selection / reservation (related to a specific TB) using resources on only slots of the same type / characteristics (e.g., PSFCH slots or NON-PSFCH slots). For example, after the TX UE selects transmission resources related to a specific TB, if the TX UE cannot maintain the same (PSSCH) TB size between initial transmission and retransmission due to the overhead of the PSFCH resources, the TX UE can be configured to trigger / perform transmission resource reselection.

[0182] Based on the embodiments of the present disclosure, even if the number of PSFCHs required for simultaneous transmission is less than the capability of the UE, the sum of the required transmission powers of the PSFCHs may be greater than the maximum transmission power of the UE. For ease of explanation, the situation where the sum of the required transmission powers of the PSFCHs is greater than the maximum transmission power of the UE may be referred to as a power limitation situation. For example, in a power limitation situation, the UE may assume / determine at least one of a PSFCH including NACK (or ACK) information, a PSFCH related to a NACK-only feedback scheme (e.g., a PSFCH including NACK information) (in a multicast) and / or a multicast (or unicast) related PSFCH as a (relatively) high-priority PSFCH transmission. For example, in a power limitation situation, the UE may assume / determine at least one of a PSFCH including ACK (or NACK) information, a PSFCH related to an ACK / N ACK feedback scheme (in a multicast) and / or a unicast (or multicast) related PSFCH as a (relatively) low-priority PSFCH transmission. For example, until the power limitation situation is overcome, the UE may omit the (relatively) low-priority PSFCH transmission. Here, for example, in the case of power limitation for PSFCH transmissions of the same priority, the UE may omit specific PSFCH transmissions from the PSFCH transmissions of the same priority. In this case, the specific PSFCH transmission may be determined by the UE implementation.

[0183] Based on the embodiments of the present disclosure, a method for in-device coexistence of NR / LTE SL is proposed. For example, when the first SL communication and the second SL communication become TDM, the interruption time or switching time generated by switching between the first SL communication and the second SL communication can be configured in an SL area with a relatively low priority. For example, when the first SL communication and the second SL communication become TDM, the interruption time or switching time generated by switching between the first SL communication and the second SL communication can be configured in a (TB) retransmission-related SL area. For example, when the first SL communication and the second SL communication become TDM, the interruption time or switching time generated by switching between the first SL communication and the second SL communication can be configured in an SL area with a (relatively) large parameter set. For example, when the first SL communication and the second SL communication become TDM, the interruption time or switching time generated by switching between the first SL communication and the second SL communication can be configured in an SL area with a (relatively) small parameter set. For example, when the first SL communication and the second SL communication are TDM, the interruption time or switching time generated by switching between the first SL communication and the second SL communication can be configured in an SL area having a (relatively) small number of time slots that (partially) overlaps with the required interruption time or switching time. For example, the parameter set may include subcarrier spacing, CP length, CP type, etc. For example, switching between the first SL communication and the second SL communication may include switching from the first SL communication to the second SL communication. For example, switching between the first SL communication and the second SL communication may include switching from the second SL communication to the first SL communication. For example, the interruption time or switching time may be the time when operations related to SL transmission and / or SL reception are interrupted. For example, the first SL communication may be NR-based SL transmission, and the second SL communication may be LTE-based SL transmission. For example, the first SL communication may be NR-based SL transmission, and the second SL communication may be LTE-based SL reception. For example, the first SL communication may be NR-based SL reception, and the second SL communication may be LTE-based SL reception. For example, the first SL communication may be NR-based SL reception, and the second SL communication may be LTE-based SL reception. For example, the first SL communication may be NR-based SL reception, and the second SL communication may be LTE-based SL reception.

[0184] Based on the embodiments of the present disclosure, the UE may expect / determine that the resource pool is (restrictively) specified so that the difference in frequency resource sizes between the subchannels constituting the resource pool is less than or equal to a preconfigured threshold. For example, the base station / network may (restrictively) configure the resource pool for the UE so that the difference in frequency resource sizes between the subchannels constituting the resource pool is less than or equal to a preconfigured threshold. In addition, for example, when transmission resources are configured over N time slots, the UE may determine the relevant TB size based on the frequency size of the transmission resources in the time slots that do not include UNNOR_SB. For example, when transmission resources are configured over N time slots, the UE may determine the relevant TB size based on the frequency size of the transmission resources in the time slots that include UNNOR_SB. For example, when transmission resources are configured over N time slots, the UE may determine the relevant TB size based on the (minimum) frequency size among the frequency sizes of the transmission resources in the N time slots. For example, when transmission resources are configured over N time slots, the UE may determine the relevant TB size based on the (maximum) frequency size among the frequency sizes of the transmission resources in the N time slots. For example, when transmission resources are configured over N time slots, the UE may determine the relevant TB size based on the average of the frequency sizes of the transmission resources over the N time slots. Here, for example, all transmission resources over the N time slots may be (restrictively) selected to have the same number of subchannels.

[0185] Based on the embodiments of the present disclosure, within the CR evaluation (time) window, among the SL permission-related reserved (transmission) resources belonging to the future window, the UE can be configured to count (CR) differently for resources that are not used by the UE due to receiving ACK information (from the RX UE) (hereinafter, first resources) and resources that are not used by the UE due to the preemption operation (hereinafter, second resources). For example, the UE can calculate / obtain the CR value by treating / considering the first resources and the second resources differently. For example, when the resources related to the transmission of a (relatively) high priority packet (higher than or equal to a preconfigured threshold) overlap with the transmission resources used by the TX UE for the transmission of a (relatively) low priority packet (lower than or equal to a preconfigured threshold), the preemption operation can be an operation in which the UE reselects the transmission resources for the transmission of the (corresponding) low priority packet. For example, the UE can be configured not to count (CR) for the first resource, and the UE can be configured to count (CR) for the second resource. For example, the UE can be configured to count (CR) for the first resource, and the UE can be configured not to count (CR) for the second resource. For example, the UE may be configured to perform (CR) counting on the first resource, and the UE may be configured to perform (CR) counting on the second resource. For example, the UE may be configured not to perform (CR) counting on the first resource, and the UE may be configured not to perform (CR) counting on the second resource. For example, the UE may be configured not to perform (CR) counting on (existing) resources that are not used for preemption, and the UE may be configured to perform (CR) counting based on reselected (replaced) resources. For example, in the case of operations related to the second resource, in particular when SL license-related reserved (transmission) resources are (partially) preempted, this may be effective in a situation where all resources related to the SL license are reselected and / or resources replacing the preempted resources are reselected.

[0186] Based on the embodiments of the present disclosure, the base station can perform cross-RAT scheduling for the UE. For example, the NR base station (e.g., gNB) can perform cross-RAT scheduling of LTE Mode 3 SL SPS for the UE. Here, for example, when the UE performs LTE SL transmission on an LTE licensed carrier, and / or when the LTE modem (or UE) is within the coverage of the LTE base station (e.g., eNB) (on the LTE licensed carrier) (e.g., in-coverage state), the UE can perform power control related to LTE SL transmission based on the downlink path loss between the LTE base station and the LTE modem (or UE). For example, when the UE performs LTE SL transmission on an Intelligent Transport System (ITS) dedicated carrier (e.g., a carrier in which the eNB does not exist), and / or the LTE modem (or UE) is outside the coverage of the LTE base station (on the LTE licensed carrier) (e.g., out-of-coverage state), the UE can perform power control related to LTE SL transmission based on the downlink path loss between the NR base station and the NR modem (or UE). For example, when the UE performs LTE SL transmission on an ITS dedicated carrier, and / or when the LTE modem (or UE) is located outside the coverage of the LTE base station (on an LTE licensed carrier), the UE can perform power control related to LTE SL transmission without considering the downlink path loss between the base station and the UE.

[0187] For example, the LTE base station may perform cross-RAT scheduling of SL CG (Type 1) for NR Mode 1 for the UE. Here, for example, when the UE performs NR SL transmission on an NR licensed carrier, and / or when the NR modem (or UE) is located within the coverage of the NR base station (on the NR licensed carrier) (e.g., an in-coverage scenario), the UE may perform power control related to NR SL transmission based on a downlink path loss between the NR base station and the NR modem (or UE). For example, when the UE performs NR SL transmission on an ITS-only carrier (e.g., a carrier in which no NR base station exists), and / or when the NR modem (or UE) is located outside the coverage of the NR base station (on the NR licensed carrier) (e.g., an out-of-coverage scenario), the UE may perform power control related to NR SL transmission based on a downlink path loss between the LTE base station and the LTE modem (or UE). For example, when the UE performs NR SL transmission on an ITS dedicated carrier, and / or when the NR modem (or UE) is outside the coverage of the NR base station (on an NR licensed carrier), the UE can perform power control associated with NR SL transmission without considering the downlink path loss between the base station and the UE.

[0188] For example, the UE may be configured to perform power control associated with LTE SL transmission or power control associated with (inter-RAT scheduled) NR SL transmission based on a downlink path loss between a (pre-configured) synchronization reference base station (e.g., gNB or eNB) and the UE (e.g., NR modem / UE, LTE modem / UE). For example, the UE may be configured to perform power control associated with LTE SL transmission or power control associated with (inter-RAT scheduled) NR SL transmission based on a downlink path loss between a (pre-configured) RSRP measurement reference base station (e.g., gNB or eNB) and the UE (e.g., NR modem / UE, LTE modem / UE).

[0189] Based on the embodiments of the present disclosure, according to (part of) the following rules, the UE may send an SCI including resource reservation information. Here, for example, for the convenience of explanation, the maximum number of resources that the UE can signal / reserve through one SCI may be referred to as N_MAX. For example, N_MAX may be configured for the UE or may be configured in advance. For example, N_MAX may be configured for the UE in a resource pool-specific manner or may be configured in advance. For example, for the convenience of description, the number of resources signaled / reserved by the UE through one SCI may be referred to as N_SIG. For example, N_SIG may be less than or equal to N_MAX. For example, N_SIG may be determined by the implementation of the UE. For example, N_SIG may be configured for the UE or may be configured in advance. For example, for the convenience of description, the number of resources selected by the UE may be referred to as N_RSC. For example, N_RSC may be the number of resources associated with a specific TB transmission selected by the UE within a selection window.

[0190] For example, on the SCI sent on the last reserved resource (related to N_RSC), the UE may signal / send only information about a preconfigured number of past reserved resources. For example, on the SCI sent on the last reserved resource (related to N_RSC), the UE may signal / send only information about the maximum number of past reserved resources that can be signaled through one SCI (e.g., N_MAX-1 or N_SIG-1). For example, the past reserved resources may be the (relative or closest) past reserved resources on the timeline from the SCI sent on the last resource. For example, on the SCI sent on the last reserved resource (related to N_RSC), the UE may signal / send only information about the (reserved) resources used to send the SCI.

[0191] For example, on the SCI sent on the first reserved resource (related to N_RSC), the UE may only signal / send information about a preconfigured number of future reserved resources. For example, on the SCI sent on the first reserved resource (related to N_RSC), the UE may only signal / send information about the maximum number of future reserved resources that can be signaled through one SCI (e.g., N_MAX-1 or N_SIG-1). For example, the future reserved resources may be the (relative or closest) future reserved resources in the timeline from the SCI sent on the first resource.

[0192] For example, on the SCI sent on the remaining reserved resources (related to N_RSC), the UE may signal / send information about a preconfigured number of past reserved resources and information about a preconfigured number of future reserved resources. For example, the preconfigured number may be a rounded value, a rounded-up value, or a rounded-down value of (N_MAX-1) / 2. For example, the preconfigured number may be a rounded value, a rounded-up value, or a rounded-down value of (N_SIG-1) / 2. For example, the past reserved resources may be the (relative or closest) past reserved resources on the timeline from the SCI sent on the remaining resources. For example, the future reserved resources may be the (relative or closest) future reserved resources on the timeline from the SCI sent on the remaining resources.

[0193] For example, when the UE performs resource reservation periodically, the above-mentioned rules may be applied (with restrictions). For example, the above-mentioned rules may be applied (with restrictions) to periodically generated services / packets. For example, when the UE performs resource selection / reservation aperiodically, the above-mentioned rules may be applied (with restrictions). For example, the above-mentioned rules may be applied (with restrictions) to aperiodically generated services / packets. For example, when the N_MAX value is configured as 3, the above-mentioned rules may be applied (with restrictions). For example, when the N_MAX value is configured as 2, the above-mentioned rules may be applied (with restrictions). For example, when the N_SIG value is configured as 3, the above-mentioned rules may be applied (with restrictions). For example, when the N_SIG value is configured as 2, the above-mentioned rules may be applied (with restrictions).

[0194] For example, in this document, information about reserved resources may be interpreted as information about the location / quantity of (reserved) resource-related time / frequency resources, information bits about the nth resource among the reserved resources (based on an SCI) (e.g., CEILING(log2(N_MAX)) bits or CEILING(log2(N_SIG)) bits, where CEILING(X) is a function that derives the minimum integer value greater than or equal to X), or bits of a preconfigured size, etc.

[0195] Based on the embodiments of the present disclosure, PUSCH transmission in which SL (control) information (e.g., SL HARQ feedback information) is piggybacked and (other) SL channel / signal (hereinafter, OT_SLCH) transmission may (partially) overlap in the time domain. In this case, according to (part of) the following rules, the UE may determine the channel / signal / information to be omitted from the transmission, or the channel / signal / information to be sent. Here, for example, for the convenience of explanation, the SL (control) information piggybacked on the PUSCH may be referred to as PIGGY_SLUCI.

[0196] For example, the UE may (first) compare the (SL) priority between PIGGY_SLUCI and OT_SLCH. In this case, for example, if PIGGY_SLUCI has a relatively higher (SL) priority than OT_SLCH, the UE may omit OT_SLCH transmission. Otherwise, for example, if OT_SLCH has a relatively higher (SL) priority than PIGGY_SLUCI, the UE may (again) compare the priority between OT_SLCH and PUSCH. In this case, the following rules may additionally apply.

[0197] For example, if PUSCH has a relatively higher priority than OT_SLCH, the UE may omit OT_SLCH transmission. In this case, (A) the UE may (still) piggyback PIGGY_SLUCI on the PUSCH and transmit it. Alternatively, (B) since PIGGY_SLUCI has a relatively lower priority than OT_SLCH, the UE may not piggyback PIGGY_SLUCI on the PUSCH and may omit PIGGY_SLUCI transmission.

[0198] For example, if the OT_SLCH has a relatively higher priority than the PUSCH, the UE may omit PUSCH transmission. In this case, (A) the UE may also omit PIGGY_SLUCI transmission. Alternatively, (B) when PIGGY_SLUCI is not piggybacked onto the PUSCH, PIGGY_SLUCI-related channel transmission (e.g., PUCCH) (hereinafter, ORI_ULCH) does not (partially) overlap with OT_SLCH transmission in the time domain, and the UE may perform both ORI_ULCH transmission and OT_SLCH transmission. If the ORI_ULCH (partially) overlaps with the OT_SLCH transmission in the time domain, the UE may perform only the transmission with the relatively higher priority.

[0199] Based on an embodiment of the present disclosure, when a UE fails to select a (re)transmission resource with a maximum number of retransmissions (hereinafter, MX_RTNUM) within a selection window (hereinafter, LD_WIN) based on a delay budget and / or delay budget configuration, (part of) the following rules may be applied. Here, for example, LD_WIN may be related to a (generated) packet and / or an (interlocked) LCH (and / or priority) (having the highest priority). For example, MX_RTNUM may be related to a packet (e.g., MAC PDU) and / or an (interlocked) LCH (and / or priority) (having the highest priority).

[0200] For example, the UE may select HARQ RTT-based (re)transmission resources within LD_WIN as much as possible. Thereafter, by triggering a new or additional resource (re)selection operation, the UE may select resources (excluding the selected resources) for the remaining number of retransmissions (hereinafter, RM_RTNUM). For example, the UE may select (re)transmission resources (pairs) within LD_WIN in which HARQ feedback-based retransmissions can be performed as much as possible. Thereafter, by triggering a new or additional resource (re)selection operation, the UE may select resources for RM_RTNUM retransmissions. Here, for example, the UE may select RM_RTNUM retransmission resources by assuming blind retransmissions. For example, it may be configured to perform blind retransmissions on the selected RM_RTNUM retransmission resources. For example, when the above rules are applied, the (actual) number of retransmission resources selected based on the newly or additionally triggered resource (re)selection operation may be limited by the number of selectable (maximum) retransmission resources within the delay budget and may be less than or equal to RM_RTNUM. For example, the delay budget may be related to the (generated) packet and / or the (associated) LCH (and / or priority) (with the highest priority). For example, the UE may (exceptional) select a mix of HARQ feedback-based retransmission resources and blind retransmission resources within LD_WIN, and the UE may select M X_RTNUM retransmission resources. Here, for example, the UE may preferentially select as many HARQ feedback-based retransmission resources as possible (within LD_WIN), and then the UE may select as many blind retransmission resources as the number of remaining retransmissions. Or, for example, the UE may preferentially select as many HARQ feedback-based retransmission resources as possible (within LD_WIN), and then the UE may select as many HARQ feedback-based retransmission resources as the number of remaining retransmissions. Here, for example, when the above rules are applied, even for HARQ (feedback) enabled MAC PDUs (and / or LCH (related data)), it can be interpreted that blind retransmission or blind retransmission resource selection is (exceptional) allowed for the UE. For example, when applying the proposed rules of the present disclosure, LD_WIN can be interpreted as a selection window with values ​​less than the delay budget and / or the (virtual) delay budget. For example, the delay budget can be related to the (generated) packet and / or the (associated) LCH (and / or priority) (with the highest priority). For example, the selection window with a value smaller than the delay budget can be a selection window with a preconfigured (proportional) smaller value than the delay budget. Here, for example, the rules can be restrictedly applied only to HARQ (feedback) enabled MAC PDUs and / or LCHs (related data). For example, the rules can be restrictedly applied only to HARQ (feedback) disabled MAC PDUs and / or LCHs (related data).

[0201] Based on the embodiments of the present disclosure, depending on whether periodic resource reservation is allowed for the UE on the resource pool, the ratio of the number of selectable resources that should be guaranteed at a minimum after the sensing-based (high-interference) resource exclusion operation (hereinafter, X_VAL) can be configured differently for the UE. For example, depending on whether periodic resource reservation is allowed for the UE on the resource pool, the SL RSRP threshold (e.g., PSSCH DMRS RSRP, PSCCH DMRS RSRP) for the sensing-based (high-interference) resource exclusion operation can be configured differently for the UE (for a combination of the priority level associated with the packet / data of the UE performing the sensing and the priority level associated with the detected packet / data of another UE). For example, depending on whether periodic resource reservation is allowed for the UE on the resource pool, the minimum size of the selection window (e.g., (minimum) T2 value (configured for each priority level)) can be configured differently for the UE. For example, depending on whether periodic resource reservation is allowed for the UE on the resource pool, whether an additional area in which X_VAL must be guaranteed is configured within the selection window can be configured differently for the UE. For example, depending on whether periodic resource reservation is allowed for the UE on the resource pool, the size (related to the additional region) may be configured differently for the UE. For example, depending on whether periodic resource reservation is allowed for the UE on the resource pool, the X_VAL that triggers an increase in the SL RSRP threshold may be configured differently for the UE (for the additional region or based on the additional region).

[0202] For example, depending on whether only aperiodic resource reservation / selection is allowed for a UE in a resource pool, the ratio of the number of selectable resources that must be minimally guaranteed after a sensing-based (high-interference) resource exclusion operation (hereinafter, X_VAL) can be configured differently for the UE. For example, depending on whether only aperiodic resource reservation / selection is allowed for a UE in a resource pool, the SL RSRP threshold (e.g., PSSCH DMRS RSRP, PSCCH DMRS RSRP) for a sensing-based (high-interference) resource exclusion operation can be configured differently for the UE (for a combination of the priority level associated with the packet / data of the sensing UE and the priority level associated with the detected packet / data of another UE). For example, depending on whether only aperiodic resource reservation / selection is allowed for a UE in a resource pool, the minimum size of the selection window (e.g., (minimum) T2 value (configured for each priority level)) can be configured differently for the UE. For example, depending on whether only aperiodic resource reservation / selection is allowed for a UE in a resource pool, whether an additional region within the selection window in which X_VAL must be guaranteed can be configured differently for the UE. For example, depending on whether only aperiodic resource reservation / selection is allowed for the UE on the resource pool, the size (related to the additional region) may be configured differently for the UE. For example, depending on whether aperiodic resource reservation / selection is allowed for the UE on the resource pool, the X_VAL that triggers an increase in the SL RSRP threshold may be configured differently for the UE (for the additional region or based on the additional region).

[0203] According to the embodiments of the present disclosure, if the size of the frequency resources of the resource pool (hereinafter, POOL_FRQSIZE) is not a multiple of the size of the subchannel (hereinafter, SUB_SIZE), the UE may be configured to (restrictively) (additionally) use MOD(POOL_FRQSIZE, SUB_SIZE) number of RBs (where MOD(X, Y) is a function that derives a remainder when dividing X by Y) only when the UE uses all subchannels in the resource pool for transmission. Here, for example, the number of RBs of MOD(POOL_FRQSIZE, SUB_SIZE) may be configured as a single subchannel.

[0204] Based on the embodiments of the present disclosure, when a UE performs periodic resource reservation, the number of reserved resources may be determined / derived according to (part of) the following rules. For example, the rule may be restrictively applied only when the resource reservation period is less than a preconfigured threshold. For example, the rule may be restrictively applied only when the resource reservation period is greater than a preconfigured threshold.

[0205] For example, the UE may randomly select a value within a preconfigured range (e.g., 5 to 15). For ease of explanation, the randomly selected value may be referred to as RAN_CVAL. Thereafter, the UE may calculate / obtain X_VAL by multiplying RAN_CVAL by (i) SC_VAL divided by RER_PD, (ii) MAX(20, RER_PD) value, or (iii) REF_PD divided by RER_PD. Here, the UE may consider / determine the resulting value obtained by (again) multiplying X_VAL by a preconfigured scaling factor (e.g., 10 or 1) as the amount of reserved resources.

[0206] For example, SC_VAL may be at least one of: PDB (in its own buffer and / or associated with LCH data (with highest priority)) (when performing resource reservation), latency requirement, size of selection window, MAX (100 ms, size of selection window (based on PDB of data)), and / or MAX (100 ms,

[0207] (Data) PDB). For example, RER_PD may be a resource reservation period. For example, the value obtained by dividing SC_VAL by RER_PD may be CEILING(SC_VAL / RER_PD) or FLOOR(SC_VAL / RE R_PD). ​​For example, REF_PD may be a preconfigured (reservation period) value. For example, the value obtained by dividing REF_PD by REF_PD may be CEILING(REF_PD / RER_PD) or FLOOR(REF_PD / RER_PD). ​​Here, for example, CEILING(N) may be a function that derives an integer value greater than or equal to N, and FLOOR(N) may be a function that derives an integer value less than or equal to N.

[0208] For example, the range of candidate values ​​from which RAN_CVAL is selected may be configured to be scaled by CEILING(X / Y) (or FLOOR(X / Y)). For example, a scaling factor applied to the range of candidate values ​​from which RAN_CVAL is selected may be configured (different for each TX_PVAL). Here, for example, TX_PVAL may be a resource reservation period value of a (TX) UE that performs sensing operations and / or resource reservation. For example, X may be a preconfigured (period) value. For example, the value of X may be configured differently or independently for each UE depending on TX_PVAL and / or depending on whether TX_PVAL exceeds a preconfigured threshold (period) value. For example, if the TX_PVAL value is (relatively) short (shorter than a preconfigured threshold (period) value), a (preconfigured) (relatively) small X value may be applied / used; if not (e.g., if the TX_PVAL value is (relatively) long (longer than a preconfigured threshold (period) value), a (preconfigured) (relatively) large X value may be applied / used. For example, if the TX_PVAL value is (relatively) short (shorter than a preconfigured threshold (period) value), a (preconfigured) (relatively) large X value may be applied / used; if not (e.g., if the TX_PVAL value is (relatively) long (longer than a preconfigured threshold (period) value), a (preconfigured) (relatively) small X value may be applied / used.

[0209] For example, the proposed rules of the present disclosure may be configured to be restrictively applied only when TX_PVAL is less than a preconfigured reference (period) value (e.g., 100 ms). For example, the proposed rules of the present disclosure may be configured to be restrictively applied only when TX_PVAL is greater than a preconfigured reference (period) value (e.g., 100 ms).

[0210] For example, when the above rules are applied, CEILING(X / Y) can be interpreted as being maintained within a (preconfigured) certain ratio / value (by (implicitly) adjusting the value of X), regardless of changes in the TX_PVAL value (for TX_PVAL that is less than a preconfigured reference (period) value). For example, when the above rules are applied, CEILING(X / Y) values ​​can be interpreted as being maintained within a (preconfigured) certain ratio / value (by (implicitly) adjusting the value of X), regardless of changes in the TX_PVAL value (for TX_PVAL that is greater than a preconfigured reference (period) value.

[0211] For example, Y may be assumed to be TX_PVAL. For example, Y may be considered as a preconfigured (periodic) value. Here, for example, if Y is considered as a preconfigured (periodic) value, the Y value may be configured differently or independently for the UE depending on whether TX_PVAL and / or TX_PVAL exceeds a preconfigured threshold (periodic) value. For example, if the TX_PVAL value is (relatively) small (less than a preconfigured threshold (periodic) value), the (preconfigured) (relatively) small Y value may be applied / used, otherwise (for example, if the TX_PVAL value is (relatively) large (greater than a preconfigured threshold (periodic) value), the (preconfigured) (relatively) large Y value may be applied / used. For example, if the TX_PVAL value is (relatively) small (less than a preconfigured threshold (periodic) value), the (preconfigured) (relatively) large Y value may be applied / used, otherwise (for example, if the TX_PVAL value is (relatively) large (greater than a preconfigured threshold (periodic) value), the (preconfigured) (relatively) small Y value may be applied / used. Here, for example, the rule may be configured as It is only restrictedly applied when TX_PVAL is less than a preconfigured reference (period) value (e.g., 100 ms). For example, the rule can be configured to be restrictedly applied only when TX_PVAL is greater than a preconfigured reference (period) value (e.g., 100 ms). In addition, for example, when the above rule is applied, regardless of the change in the TX_PVAL value (for TX_PVAL less than the preconfigured reference (period) value), it can be interpreted as CEILING (X / Y) being maintained at a (preconfigured) certain ratio / value (by (implicitly) adjusting Y). For example, when the above rule is applied, regardless of the change in the TX_PVAL value (for TX_PVAL greater than the preconfigured reference (period) value), it can be interpreted as CEILING (X / Y) being maintained at a (preconfigured) certain ratio / value (by (implicitly) adjusting Y).

[0212] Based on the embodiments of the present disclosure, the UE may perform a sensing-based resource exclusion operation. Here, it is assumed that the resource reservation period of another UE that the UE succeeds in detection / decoding is P_VAL. In this case, for example, the UE may assume that CEILING(REF_VAL / P_VAL) resources are reserved / exist with a P_VAL period, and the UE may perform a resource exclusion operation (for resources). For example, the UE may assume that CEILING(MAX(100ms, (data's PDB-based selection window size)) / MAX(20, P_VAL)) resources (here, for example, MAX(X,Y) is a function that derives the maximum value between X and Y) are reserved / exist with a P_VAL period, and the UE may perform a resource exclusion operation (for resources). For example, the UE may assume that CEILING((data's PDB-based) selection window size / MAX(20, P_VAL)) resources are reserved / exist with a P_VAL period, and the UE may perform a resource exclusion operation (for resources). For example, REF_VAL may be a preconfigured value (from the base station / network). For example, REF_VAL may be the size of the selection window. For example, REF_VAL may be the size of the selection window configured by the (TX) UE that performs the sensing operation and / or resource reservation. For example, REF_VAL may be the result value obtained by multiplying the selection window size by a preconfigured ratio. For example, depending on the resource reservation period value (hereinafter, P_VALTX) of the (TX) UE that performs the sensing operation and / or resource reservation, REF_VAL may be configured differently or independently for the UE. For example, depending on whether P_VALTX exceeds a preconfigured threshold (period) value, REF_VAL may be configured differently or independently for the UE. For example, REF_VAL may be configured differently or independently for the UE according to the P_VAL value. For example, depending on whether P_VAL exceeds a preconfigured threshold (period) value, REF_VAL may be configured differently or independently for the UE.

[0213] For example, if the P_VALTX value or the P_VAL value is (relatively) short (shorter than a preconfigured threshold (period) value), then a (preconfigured) (relatively) small REF_VAL value can be applied / used, otherwise (e.g. if P_VAL TX value or P_VAL value is (relatively) long (longer than a preconfigured threshold (period) value), a (preconfigured) (relatively) large REF_VAL value can be applied / used. For example, if the P_VALTX value or the P_VAL value is (relatively) short (shorter than a preconfigured threshold (period) value), a (preconfigured) (relatively) large REF_VAL value can be applied / used, otherwise (for example, if the P_VALTX value or the P_VAL value is (relatively) long (longer than a preconfigured threshold (period) value), a (preconfigured) (relatively) small REF_VAL value can be applied / used. Here, for example, the rule can be configured to be restricted to be applied only when P_VALTX or P_VAL is less than a preconfigured reference (period) value (for example, 100ms). For example, the rule can be configured to be applied only when P_VALTX or P_VAL is greater than a preconfigured reference (period) value (e.g., 100 ms). In addition, for example, when the above rules are applied, regardless of how the P_VALTX value or P_VAL value changes (for P_VALTX or P_VAL that is less than a preconfigured reference (period) value), it can be interpreted that CEILING(REF_VAL / P_VAL) is maintained at a certain (preconfigured) ratio / value (by (implicitly) adjusting REF_VAL or P_VAL). For example, when the above rules are applied, regardless of how the P_VALTX value or P_VAL value changes (for P_VALTX or P_VAL that is greater than a preconfigured reference (period) value), it can be interpreted that CEILING(REF_VAL / P_VAL) is maintained at a certain (preconfigured) ratio / value (by (implicitly) adjusting REF_VAL or P_VAL).

[0214] For example, the UE may be configured (independently or differently) in a resource pool-specific manner as to whether the proposed rules and / or related parameters (e.g., REF_VAL) of the present disclosure are applied. For example, the UE may be configured (independently or differently) in a service type-specific manner as to whether the proposed rules and / or related parameters (e.g., REF_VAL) of the present disclosure are applied. For example, the UE may be configured (independently or differently) in a service priority-specific manner as to whether the proposed rules and / or related parameters (e.g., REF_VAL) of the present disclosure are applied. For example, the UE may be configured (independently or differently) in a QoS requirement (e.g., URLLC / EMBB service, reliability, delay)-specific manner as to whether the proposed rules and / or related parameters (e.g., REF_VAL) of the present disclosure are applied. For example, the UE may be configured (independently or differently) in a broadcast type (e.g., unicast, multicast, broadcast)-specific manner as to whether the proposed rules and / or related parameters (e.g., REF_VAL) of the present disclosure are applied. For example, whether to apply the proposed rules and / or related parameters (e.g., REF_VAL) of the present disclosure may be configured for the UE (independently or differently) in a specific manner for the (resource pool) congestion level (e.g., CBR). For example, whether to apply the proposed rules and / or related parameters (e.g., REF_VAL) of the present disclosure may be configured for the UE (independently or differently) in a specific manner for the SL HA RQ feedback scheme (e.g., NACK-only feedback, ACK / NACK feedback). For example, whether to apply the proposed rules and / or related parameters (e.g., REF_VAL) of the present disclosure may be configured for the UE (independently or differently) depending on whether the resource reservation period is less than or greater than a preconfigured threshold.

[0215] Figure 12 A process for a UE to select resources within a selection window according to an embodiment of the present disclosure is shown. Figure 12 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0216] Figure 13 A method for a UE to exclude specific resources within a selection window according to an embodiment of the present disclosure is shown. Figure 13 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0217] refer to Figure 12In step S1210, the TX UE may receive SCI from at least one UE (e.g., UE#1 to UE#N). For example, the TX UE may receive SCI from at least one UE within a sensing window. Here, for example, the SCI may include information related to a resource reservation period. For example, the SCI transmitted by UE#1 may include information related to a reservation period for resources reserved / selected by UE#1, the SCI transmitted by UE#2 may include information related to a reservation period for resources reserved / selected by UE#2, and the SCI transmitted by UE#N may include information related to a reservation period for resources reserved / selected by UE#N.

[0218] For example, in NR resource allocation mode 2, at least one UE may use the SCI to signal the priority of SL transmission to the TX UE. For example, the TX UE may decode the SCI, and the TX UE may perform sensing and / or resource (re)selection based on the priority. For example, the resource (re)selection process may include a step of identifying candidate resources in a resource selection window by the TX UE, and a step of selecting resources for (re)transmission from among the identified candidate resources by the TX UE.

[0219] In step S1220, the TX UE may determine the size of the selection window. In the present disclosure, the selection window may be referred to as a resource selection window. For example, the resource selection window may be a time interval during which the TX UE selects resources for SL transmission. For example, after the TX UE triggers resource (re)selection, the resource selection window may start at T1 ≥ 0, and the resource selection window may be limited by the TX UE's remaining packet delay budget.

[0220] In step S1230, the TX UE may determine resources to exclude from resource selection based on the size of the selection window and the resource reservation period. For example, in the step of identifying candidate resources in the resource selection window by the TX UE, if a specific resource is indicated by an SCI received by the TX UE from at least one UE, and if the L1 SL RSRP measurement value for the specific resource exceeds the SL RSRP threshold, the TX UE may not determine the specific resource as a candidate resource. That is, in this case, the TX UE may not select the specific resource as a resource for SL transmission. For example, the SL RSRP threshold may be determined based on the priority of SL transmission indicated by the SCI received by the TX UE and the priority of SL transmission on the resource selected by the TX UE.

[0221] For example, the TX UE may determine resources to exclude from resource selection based on Table 6.

[0222] [Table 6]

[0223]

[0224] Referring to Table 6, when (a), (b), and (c) are satisfied, the TX UE may exclude the corresponding resource (Rx, y) from the resource set (SA). That is, the TX UE may not select the resource that satisfies conditions (a), (b), and (c). In this case, for example, the TX UE may assume that CEILING (REF_VAL / P_VAL) resources are reserved / exist with a P_VAL period, and the TX UE may perform a resource exclusion operation for these resources. For example, REF_VAL may be the size of the selection window. For example, REF_VAL may be the size of the selection window configured by the (TX) UE that performs a sensing operation and / or resource reservation. For example, Y=CEILING(X) may be a function that derives a minimum integer value greater than or equal to X.

[0225] exist Figure 13 In the embodiment, it is assumed that the TX UE receives SCI from another UE based on resource A. Also, it is assumed that 5 times the resource reservation period (P) is equal to the size of the selection window (S) (i.e., 5*P=S). Specifically, it is assumed that the resource reservation period is 10ms and the size of the selection window is 50ms. In this case, the TX UE can determine CEILING(S / P) resources (i.e., Figure 13 The resources in B) are selected / reserved by the UE that sent the SCI, and the TX UE may not select the CEILING (S / P) resources (i.e. Figure 13 On the other hand, the TX UE may determine the resources after CEILING(S / P) resources (i.e., Figure 13 Resources in C) not selected / reserved by the UE that sent the SCI, it may be allowed to be used by the TX UE to select Figure 13 Resource C.

[0226] According to the prior art, when the TX UE receives SCI from another UE based on resource A, the TX UE can determine that CEILING (100 [ms] / P) resources are selected / reserved by the UE that sent the SCI, and the TX UE may not select the resources of CEILING G (100 [ms] / P). Here, P may be a resource reservation period in 'ms'. That is, according to the prior art, the TX UE cannot select Figure 13 resource C and resource B. This may result in unnecessary resource exclusion operations of unnecessary UEs. On the other hand, according to the proposed method, based on the size of the selection window and the resource reservation period, the TX UE can perform efficient resource exclusion operations.

[0227] Return Reference Figure 12 In step S1240, the TX UE may select at least one resource from the remaining resources excluding the excluded resources, and may transmit the PSCCH and / or PSSCH based on the at least one resource.

[0228] Based on an embodiment of the present disclosure, during the CR calculation / counting process, based on the HAR Q feedback (e.g., ACK) (received from the RX UE), the UE may not reflect the SL (retransmission) reserved resources that will not be used (signaled via the SCI) in the CR calculation / counting. For example, based on the HARQ feedback (e.g., ACK) (received from the RX UE), the UE may not reflect the number of subchannels associated with the SL (retransmission) reserved resources that will not be used (signaled via the SCI) in the CR calculation / counting. For example, based on UL / SL prioritization, the UE may not reflect the SL (retransmission) reserved resources that will not be used (signaled via the SCI) in the CR calculation / counting. For example, based on UL / SL prioritization, the UE may not reflect the number of subchannels associated with the SL (retransmission) reserved resources that will not be used (signaled via the SCI) in the CR calculation / counting. For example, the UL / SL prioritization scenario may be a scenario in which the UE omits SL transmission due to an overlap of high-priority UL transmission and SL transmission. Here, for example, the above rules may be configured to be restrictively applied only when the (related) SL grant (e.g., retransmission reserved resources) is released based on the reception of HARQ feedback (e.g., ACK). For example, the above rules may be configured to be restrictively applied only when the (related) SL grant (e.g., retransmission reserved resources) is cleared based on the reception of HARQ feedback (e.g., ACK). For example, the above rules may be configured to be restrictively applied only when the (interlocked) HARQ buffer is flushed. For example, the above rules may be configured to be restrictively applied only to the case where the SL grant is generated for the transmission of a single MAC PDU. For example, the rule may be configured to be restrictively applied only to the case where the SL grant is generated for the transmission of multiple MAC PDUs.

[0229] Alternatively, for example, even if the (related) SL grant (e.g., retransmission reserved resources) is released / cleared or the (associated) HARQ buffer is flushed based on the reception of HARQ feedback (e.g., ACK), since other (some) UEs on the system may not be able to use the released / cleared (re)transmission resources, the UE may be configured to (still) reflect the resources in the CR calculation / count. For example, even if the (related) SL grant (e.g., retransmission reserved resources) is released / cleared or the (associated) HARQ buffer is flushed based on the reception of HARQ feedback (e.g., ACK), since other (some) UEs on the system may not be able to use the released / cleared (re)transmission resources, the UE may be configured to (still) reflect the resources in the CR calculation / count in a resource pool specific manner. For example, even if (the associated) SL grant (e.g., retransmission reserved resources) is released / cleared based on the reception of HARQ feedback (e.g., ACK), or the (associated) HARQ buffer is flushed, because other (some) UEs on the system may not be able to use the released / cleared (re)transmission resources, the UE may be configured to (still) reflect the resources in the CR calculation / count in a service type specific manner. For example, even if (the associated) SL grant (e.g., retransmission reserved resources) is released / cleared based on the reception of HARQ feedback (e.g., ACK), or the (associated) HARQ buffer is flushed, because other (some) UEs on the system may not be able to use the released / cleared (re)transmission resources, the UE may be configured to (still) reflect the resources in the CR calculation / count in a service priority specific manner. For example, even if the (related) SL grant (e.g., retransmission reserved resources) is released / cleared based on the reception of HARQ feedback (e.g., ACK) or the (associated) HAR Q buffer is flushed, since other (some) UEs on the system may not be able to use the released / cleared (re)transmission resources, the UE can be configured to (still) reflect the resources in the CR calculation / count in a (resource pool) congestion level specific manner.

[0230] For example, due to preemption and / or UL / SL prioritization, even if the UE cannot use the previously reserved (retransmission) resources or the UE releases / clears the previously reserved (retransmission) resources and performs reselection of (retransmission) resources, since other (some) UEs on the system may not be able to use the released / cleared (re)transmission resources, the UE may be configured to (still) reflect this resource in the CR calculation / count. For example, due to preemption and / or UL / SL prioritization, even if the UE cannot use the previously reserved (retransmission) resources or the UE releases / clears the previously reserved (retransmission) resources and performs reselection of (retransmission) resources, since other (some) UEs on the system may not be able to use the released / cleared (re)transmission resources, the UE may be configured to (still) reflect this resource in the CR calculation / count in a resource pool specific manner. For example, due to preemption and / or UL / SL prioritization, even if the UE cannot use the previously reserved (retransmission) resources or the UE releases / clears the previously reserved (retransmission) resources and performs reselection of (retransmission) resources, because other (some) UEs on the system may not be able to use the released / cleared (re)transmission resources, the UE may be configured to (still) reflect the resources in the CR calculation / count in a service priority specific manner. For example, due to preemption and / or UL / SL prioritization, even if the UE cannot use the previously reserved (retransmission) resources or the UE releases / clears the previously reserved (retransmission) resources and performs reselection of (retransmission) resources, because other (some) UEs on the system may not be able to use the released / cleared (re)transmission resources, the UE may be configured to (still) reflect the resources in the CR calculation / count in a (resource pool) congestion level specific manner.

[0231] Here, for example, when the above rules are applied, during a retransmission operation based on HARQ feedback reception, the UE can be prevented from excessively reserving (retransmitting) resources.

[0232] Based on the embodiments of the present disclosure, the second SCI format may be determined as follows: For example, the second SCI format may include a second SCI format A and / or a second SCI format B.

[0233] For example, the second SCI format A can

[0234] - does not include the Zone ID field (of the TX UE) and the Communication Range field, wherein the Communication Range field may be related to the transmission MAC PDU (e.g., TB) and / or (interlocked) service, and / or

[0235] - configured to be used / specified when a HARQ feedback scheme (based on unicast and / or multicast) (hereinafter, HARQ_FDTYPE1) in which ACK or NACK information is sent (and / or a (multicast) NACK-only HARQ feedback scheme (which is not based on the distance between the TX UE and the RX UE)) is used / requested (depending on whether PSSCH decoding is successful), and / or

[0236] - configured to be used / specified when unicast and / or multicast-based SL communication is performed (and / or when a multicast HARQ feedback scheme based on HARQ_FDTYPE3 is used / requested), and / or

[0237] - Includes a HARQ feedback enable / disable indicator (field) (hereinafter, HQ_EDFD).

[0238] For example, the second SCI format B can

[0239] - includes a zone ID field (of the TX UE) and a communication range field, wherein the communication range field may be related to the transmission of a MAC PDU (e.g., TB) and / or a (interlocked) service, and / or

[0240] - configured to be used / specified when a (multicast)-only NACK HARQ feedback scheme based on a distance between a TX UE and a RX UE (hereinafter, HARQ_FDTYPE2) (and / or a (multicast)-only NACK HARQ feedback scheme (not based on a distance between a TX UE and a RX UE) (hereinafter, HARQ_FDTYPE3)) is used / requested, and / or

[0241] - configured to be used / specified when multicast-based SL communication is performed (and / or when a multicast HARQ feedback scheme based on HARQ_FDTYPE2 (and / or HARQ_FDTYPE3) is used / requested), and / or

[0242] - Includes HARQ feedback enable / disable indicator (field).

[0243] Here, for example, in the second SCI format A and / or the second SCI format B, a field (hereinafter, MID_FIELD) may be defined to notify the RX UE (from the TXUE) which parameter-based PSFCH resource should be used to transmit HARQ feedback and / or what method / type of HARQ feedback should be performed. For example, this field may have a preconfigured size (e.g., 1 bit).

[0244] Specifically, for example, if MID_FIELD is indicated as 0, the RX UE may specify / determine that the (group) member ID parameter (e.g., M_ID) value in the formula for determining the PSFCH resource (index) is 0, and the RX UE may determine / derive the PSFCH resource (index) used to send HARQ feedback based on M_ID=0. For example, if MID_FIELD is indicated as 0, the RX UE may specify / determine that the (group) member ID parameter (e.g., M_ID) value in the formula for determining the PSFCH resource (index) is 0, and the RX UE may apply a (unicast-based) HARQ feedback scheme for sending (pre-configured) ACK or NACK information. For example, if MID_FIELD is indicated as 0, the RX UE may specify / determine that the (group) member ID parameter (e.g., M_ID) value in the formula for determining the PSFCH resource (index) is 0, and the RX UE may apply a HARQ feedback scheme of HARQ_FDTYPE2. For example, if MID_FIELD is indicated as 0, the RX UE may specify / determine that the (group) member ID parameter (e.g., M_ID) value in the formula for determining the P SFCH resource (index) is 0, and the RX UE may apply the HARQ feedback scheme of HARQ_FDTYPE3.

[0245] For example, if MID_FIELD is indicated as 1, the RX UE may specify / determine the member ID parameter (e.g., M_ID) value in the formula for determining the PSFCH resource (index) as the (member ID) value provided by the (own) upper layer (e.g., V2X layer), and the RX UE may determine / derive the PSFCH resource (index) through which HARQ feedback is transmitted based on the (member ID) value. For example, if MID_FIELD is indicated as 1, the RX UE may specify / determine the member ID parameter (e.g., M_ID) value in the formula for determining the PSFCH resource (index) as the (member ID) value provided by the (own) upper layer (e.g., V2X layer), and the RX UE may apply a (groupcast-based) HARQ feedback scheme for transmitting ACK or NACK information based on the (member ID) value.

[0246] For example, if the HQ_EDFD field is indicated as disabled, the MID_FIELD field may be designated / configured to a preconfigured (specific) value (e.g., 0 or 1) (hereinafter, FX_VAL). For example, if the TX UE does not request HARQ feedback from the RX UE, the MID_FIELD field may be designated / configured to FX_VAL. For example, when the TX UE transmits a HARQ disabled MAC PDU (and / or LCH-related data) to the RX UE, the MID_FIELD field may be designated / configured to FX_VAL. For example, when the TX UE performs a blind retransmission (for transmitting a MAC PDU), the MID_FIELD field may be designated / configured to FX_VAL. Here, for example, when the above rules are applied, (if the HQ_EDFD field is indicated as disabled), when the MID_FIELD field is specified as a value other than FX_VAL, it may be considered to indicate other (preconfigured) information / status (e.g., the type of broadcast (e.g., the distinction between multicast and unicast, or the distinction between multicast and / or unicast and broadcast)) (e.g., this can be interpreted as a reserved state (to be used in future releases)).

[0247] For example, through a predefined field (e.g., 2 bits) on the second SCI format A and / or the second SCI format B and / or the first SCI format, it can be configured to be signaled to transmit broadcast type information and / or HARQ feedback scheme information. For example, through a predefined field (e.g., 2 bits) on the second SCI format A and / or the second SCI format B and / or the first SCI format, the UE can transmit broadcast type information and / or HARQ feedback scheme information. Here, for example, through a 2-bit predefined field, any one of a unicast HARQ feedback scheme, a groupcast (type 1) HARQ feedback option 1, a groupcast (type 2) HARQ feedback option 2, or a broadcast can be indicated. For example, the unicast HARQ feedback scheme can be in the form of ACK / NACK HARQ feedback. For example, according to the unicast HARQ feedback scheme, the UE can consider the (group) member ID parameter (e.g., M_ID) value in the formula for determining the PSFCH resource (index) to be 0, and then, the PSFCH resource (index) used to transmit the HARQ feedback can be determined / derived. For example, the form of multicast (type 1) HARQ feedback option 1 may be NACK-only HARQ feedback. For example, according to the multicast (type 1) HARQ feedback option 1, the UE may consider the (group) member ID parameter (e.g., M_ID) value in the formula for determining the PSFCH resource (index) to be 0, and then, the PSFCH resource (index) through which the HARQ feedback is sent may be determined / derived. For example, the form of multicast (type 2) HARQ feedback option 2 may be ACK / NACK HARQ feedback. For example, according to the multicast (type 2) HARQ feedback option 2, the UE may consider the (group) member ID parameter (e.g., M_ID) value in the formula for determining the PSFCH resource (index) to be a (member ID) value provided by an upper layer (of the UE), and then, the PSFCH resource (index) through which the HAR Q feedback is sent may be determined / derived. For example, the broadcast scheme may be in the form of disabling HARQ feedback.

[0248] Figure 14 The following illustrates a process in which a base station according to an embodiment of the present disclosure performs size alignment on SL DCI. Figure 14 Possible combination with various embodiments of the present disclosure.

[0249] Based on the embodiments of the present disclosure, multiple resource pools can be configured or pre-configured for the UE. For example, the multiple resource pools can be multiple mode 1 resource pools. For example, in step S1410, the base station can send information related to multiple resource pools to the UE. In the above case, on the mode 1 DCI (e.g., DCI format 3_0) sent by the base station, an index field (hereinafter, RP_FID) of (interlocked) resource pools can be defined. Here, for example, when the base station sends the mode 1 DCI to the UE, the base station can inform the UE for which resource pool the mode 1 DCI is being scheduled. For example, when the base station sends the mode 1 DCI to the UE, the base station can inform which resource pool the mode 1 DCI is related to.

[0250] In the above case, for example, if the following (some) parameters and / or operations (related to Mode 1 operation) can be configured differently between multiple Mode 1 resource pools, the payload size (of Mode 1 DCI) can vary depending on the resource pool targeted by the Mode 1 DCI.

[0251] Example) the maximum number of time resources (e.g., time slots) that can be signaled via Mode 1 DCI and / or the maximum number of time resources (e.g., time slots) that can be signaled via SCI, and / or

[0252] Example) the number of sub-channels constituting the resource pool, and / or

[0253] Example) whether CG action is configured, and / or whether monitoring of Mode 1 DCI (e.g., DCI format 3_0) based on CRC scrambled with SL-CS-RNTI is configured (e.g., accordingly, determining whether a (CG) configuration index field (on CG / DG related Mode 1 DCI) is present), and / or

[0254] Example) whether PUCCH resources are configured, and / or whether reporting operation for SL HARQ feedback information via PUCCH is configured, and / or the HARQ codebook type applied when reporting SL HARQ feedback information via PUCCH, and / or

[0255] Example) The number of candidate values ​​that can be specified as the time gap between the PSFCH time slot and the PUCCH time slot, for example, the number of candidate values ​​that can be specified as the time gap between the PSFCH time slot and the PUCCH time slot when a reporting operation for SL HARQ feedback information through the PUCCH is configured, and / or

[0256] Example) (maximum) number of HARQ process IDs, e.g., (maximum) number of HARQ process IDs associated with Mode 1 DCI operation and / or SL operation

[0257] However, since the UE cannot know in advance the resource pool targeted by the Mode 1 DCI sent by the base station, there may be a problem because the UE must perform blind search / decoding for the payload sizes of multiple Mode 1 DCIs (which may be different for each resource pool).

[0258] To alleviate the above-mentioned problem, for example, the payload sizes of multiple Mode-1 DCIs respectively associated with multiple resource pools can be aligned. For example, in step S1420, the base station can match the payload sizes of multiple Mode-1 DCIs respectively associated with multiple resource pools. In step S1430, the UE can monitor the multiple Mode-1 DCIs. For ease of explanation, the case in which the payload sizes of multiple Mode-1 DCIs respectively associated with multiple resource pools are aligned can be referred to as Option A. A specific example of Option A will be described below.

[0259] For example, for the maximum payload size among the payload sizes of multiple (different) Mode 1 DCIs associated with multiple resource pools, the payload sizes of the remaining Mode 1 DCIs may be aligned (e.g., zero-padded). For example, the base station may align the payload sizes of the multiple Mode 1 DCIs to the maximum payload size by performing zero padding on the payloads of the remaining Mode 1 DCIs. Table 7 shows an example of matching the payload sizes of multiple Mode 1 DCIs (e.g., DCI format 3_0).

[0260] [Table 7]

[0261]

[0262] Referring to Table 7, when multiple resource pools are configured for the UE up to the size of the DCI with the largest size among multiple DCIs (e.g., DCI format 3_0), the base station can perform zero padding on the remaining DCI. For example, it can be assumed that four resource pools (e.g., resource pool A, resource pool B, resource pool C, resource pool D) are configured for the UE, and the size of the DCI related to resource pool A is the largest. In this case, by performing zero padding on the DCI related to the remaining resource pools (e.g., DCI related to resource pool B, DCI related to resource pool C, DCI related to resource pool D), the base station can align the sizes of multiple DCIs (e.g., the size of the DCI related to resource pool A, the size of the DCI related to resource pool B, the size of the DCI related to resource pool C, the size of the DCI related to resource pool D) with each other. In addition, the UE can monitor or receive multiple DCIs based on the aligned DCI sizes. Additionally, when the size of DCI format 3_0 is not aligned with the size of DCI format 3_1, the base station can align the size of DCI format 3_0 with the size of DCI format 3_1 by performing zero padding on the DCI format with a smaller size. Here, for example, DCI format 3_0 may be DCI for scheduling NR PSCCH and NR PSSCH in one cell, and DCI format 3_1 may be DCI for scheduling LTE PSCCH and LTE PSSCH in one cell.

[0263] For example, for the smallest payload size among multiple (different) Mode 1 DCI payload sizes associated with multiple resource pools, the payload sizes of the remaining Mode 1 DCIs may be aligned (e.g., (field or bit) truncated). For example, by performing truncation on the payloads of the remaining Mode 1 DCIs, the base station may align the payload sizes of the multiple Mode 1 DCIs to the smallest payload size.

[0264] For example, the payload sizes of multiple (different) mode 1 DCIs associated with multiple resource pools may be aligned to a preconfigured (reference) payload size (e.g., (field or bit) truncation or zero padding). For example, by performing truncation or zero padding on the payloads of multiple mode 1 DCIs, the base station may align the payload sizes of multiple mode 1 DCIs to the preconfigured (reference) payload size.

[0265] For example, all parameters and / or operations (related to Mode 1 operation) may be configured identically across multiple resource pools. For ease of explanation, the case where all parameters and / or operations are configured identically across multiple resource pools may be referred to as Option B. For example, according to Option B, the UE may not expect that the payload sizes of Mode 1 DCIs used for scheduling for different resource pools are (partially) different. For example, according to Option B, the UE may determine / assume that the payload sizes of Mode 1 DCIs used for scheduling for different resource pools are all the same.

[0266] For example, the index information (bits) of the (interlocked) resource pools may be masked and / or scrambled to the Mode 1 DCI-related CRC. For ease of explanation, the case where the index information (bits) of the (interlocked) resource pools is masked and / or scrambled to the Mode 1 DCI-related CRC may be referred to as Option C. For example, the Mode 1 DCI-related CRC may be (preconfigured) CRC least significant bits (LSBs) X bits. For example, X may be a positive integer. For example, X may be 3.

[0267] In addition, for example, the payload size may be the same between a DCI format (e.g., DCI format 0_1 ​​or DCI format 0_0) (hereinafter, REF_U U DCI) related to pre-configured Uu communication (e.g., communication between a base station and a UE) and a Mode 1 DCI (e.g., DCI format 3_0). For example, the base station may align the payload sizes between REF_U U DCI and Mode 1 DCI (e.g., DCI format 3_0). For example, to prevent exceeding the (maximum) number of blind decodes (supported by the UE), the payload sizes may be aligned between REF_U U DCI and Mode 1 DCI. For example, to prevent exceeding the (maximum) number of DCI format budgets, the payload sizes may be aligned between REF_U U DCI and Mode 1 DCI.

[0268] In the above case, for example, the maximum payload size (hereinafter, REP_SLSIZE) among the payload sizes of the Mode 1 DCI associated with the multiple resource pools derived based on Option A and the payload size of the SL DCI format (e.g., DCI format 3_1) used by the NR base station for scheduling of LTE SL can be aligned. For example, the minimum payload size (hereinafter, REP_SLSIZE) among the payload sizes of the Mode 1 DCI associated with the multiple resource pools derived based on Option A and the payload size of the SL DCI format (e.g., DCI format 3_1) used by the NR base station for scheduling of LTE SL can be aligned. Additionally, for example, REP_SLSIZE and the payload size of REF_UUDCI can be aligned. For example, the base station can align the payload size of the SL DCI format (e.g., DCI format 3_1) used by the NR base station for scheduling of LTE SL with REP_SLSIZE, and the base station can align the payload size of REF_UUDCI with REP_SLSIZE. In this case, for example, if the payload size of REF_UUDCI is greater than REP_SLSIZE, all payload sizes of Mode 1 DCI associated with multiple resource pools may be aligned to the payload size of REF_UUDCI. For example, if the payload size of REF_UUDCI is greater than REP_SLSIZE, the base station may align the payload size of Mode 1 DCI associated with multiple resource pools to the payload size of REF_UUDCI by performing zero padding on the payload size of Mode 1 DCI associated with multiple resource pools.

[0269] For example, if the base station aligns the (total) payload size between Mode 1 DCIs (associated with multiple resource pools) based on Option A, the base station may be configured to align the payload size by the total payload. For ease of explanation, the case where the base station is configured to align the payload size by the total payload may be referred to as Method A. For example, according to Method A, the base station performs zero padding on the Mode 1 DCI of a (relatively) small total payload size so that it has the same (payload) size as the Mode 1 DCI of the largest total payload size. For example, according to Method A, the base station performs zero padding after the last (LSB) bit of the Mode 1 DCI of a (relatively) small total payload size so that it has the same (payload) size as the Mode 1 DCI of the largest total payload size.

[0270] For example, if the base station aligns the (total) payload size between mode 1 DCIs (associated with multiple resource pools) based on option A, the base station can be configured to align the total payload size by aligning the size per field. For ease of explanation, the case where the base station is configured to align the overall payload size by aligning the size per field is referred to as method B. For example, according to method B, when the size of a specific field (e.g., a frequency resource allocation field) of mode 1 DCI associated with resource pool X is larger than the size of the same purpose field of mode 1 DCI associated with resource pool Y, the base station can align the latter's field size with the former's field size. In this case, for example, the base station can perform zero padding on the most significant bit (MSB) of the latter's field. For example, the base station can perform zero padding on the least significant bit (LSB) of the latter's field.

[0271] For example, when method B is applied, it can be interpreted that the field type / configuration of mode 1 DCI related to multiple resource pools is the same. For example, when method B is applied, it can be interpreted that the field (setting) order of mode 1 DCI related to multiple resource pools is the same.

[0272] For example, when the field types / configurations of Mode 1 DCIs related to multiple resource pools are different, method B can be applied to the identically existing fields, and method A can be applied to the remaining fields. In this way, for example, the payload size can be configured to align between Mode 1 DCIs. For example, by (exceptional) applying method A, the payload size can be configured to align between Mode 1 DCIs.

[0273] For example, the size of fields used for the same purpose and / or the presence of fields used for specific purposes may be different between Mode 1 DCIs associated with multiple resource pools, and / or the number of Mode 1 resource pools configured for each carrier may be different. Therefore, taking this into account, a field indicating the index of the carrier on which the SL (transmission) resources are scheduled (hereinafter, CIF) may be defined to appear on the Mode 1 DCI in priority to the RP_FID field. For example, under Mode 1 DCI, the CIF field may be defined as the first field, the RP_FID field may be defined as the second field, and the (frequency / time) resource information field may be defined after the third field. For example, the CIF may be defined to appear on the Mode 1 DCI in priority to the PSSCH and / or PSCCH related time / frequency (transmission) resource information (e.g., position / number) field. For example, the CIF (associated with the first PSSCH transmission) may be defined to appear on the Mode 1 DCI in priority to the PSCCH (starting) frequency (transmission) resource information field.

[0274] For example, the above rules may be limited to only operations based on method A. For example, the above rules may be limited to only operations based on method B. Through this, for example, the UE may decode the CIF field and / or the RP_FID field regardless of the size of the field. For example, the UE may decode the CIF field and / or the RP_FID field regardless of the size of the field that varies depending on the resource pool and / or carrier.

[0275] For example, the synchronization reference source for Mode 1SL operation and / or selectable for Mode 1SL operation may be configured identically across multiple resource pools.For example, the synchronization reference source for Mode 1SL operation and / or selectable for Mode 1SL operation may be configured differently across multiple resource pools.

[0276] For example, between SL CSI reporting operations triggered based on multiple resource pools, the SL CSI reporting delay bounds may (exceptional) be allowed to overlap. For example, in the case of SL CSI reporting operations triggered based on multiple resource pools, before the UE (successfully) receives SL CSI information of the SL CSI report triggered based on a specific resource pool, the UE may (exceptional) be allowed to (additionally) trigger an SL CSI report based on another resource pool.

[0277] For example, the proposed rules of the present disclosure may be restrictively applied only to DCI related to Mode 1 CG Type 2. For example, the proposed rules of the present disclosure may be restrictively applied only to Mode 1 DG DCI.

[0278] In step S1440 , the UE may perform SL transmission based on the received DCI.

[0279] According to the proposed method, since the maximum number of blind decodings supported by the UE may not be exceeded, the complexity of the UE caused by blind decoding of the DCI can be reduced. In addition, according to the proposed method, since the maximum number of DCI formats budgeted by the UE may not be exceeded, the complexity of the UE caused by blind decoding of the DCI can be reduced.

[0280] Based on an embodiment of the present disclosure, when SL communication (e.g., unicast or multicast) is performed between UEs, when the UE changes the synchronization source / reference (hereinafter, SL_REF), the UE may declare a (SL)RLF for the corresponding SL communication (link) and / or SL session and / or PC5 RRC connection. For example, if the UE changes the SL_REF to another SL_REF after establishing a session (related to the SL communication (link)), the UE may declare a (SL)RLF for the corresponding SL communication (link) and / or SL session and / or PC5 RRC connection. For example, if the UE changes the SL_REF to another SL_REF before establishing a session (related to the SL communication (link)), the UE may declare a (SL)RLF for the corresponding SL communication (link) and / or SL session and / or PC5 RRC connection. For example, when SL communication (e.g., unicast or multicast) is performed between UEs, if the difference between the (time / frequency) synchronization associated with the changed SL_REF and the (time / frequency) synchronization associated with the SL_REF before the change exceeds a preconfigured threshold (e.g., CP length), the UE may declare a (SL)RLF for the corresponding SL communication (link) and / or SL session and / or PC5 RRC connection.

[0281] Based on the embodiments of the present disclosure, the UE may transmit multiple PSFCHs. For ease of explanation, the number of multiple PSFCH transmissions may be referred to as K_VAL. In this case, for example, the sum of the transmit powers required for multiple PSFCH transmissions may exceed the UE's maximum transmit power value and / or the PCMAX value calculated based on K_VAL PSFCH transmissions (hereinafter, power-limited case). In this case, according to (part of) the following rules, the UE may determine the PSFCH to be transmitted, and the UE may determine the transmit power (related to the transmitted PSFCH). Here, for example, it may be assumed / considered that K_VAL is less than or equal to the maximum number of PSFCHs that the UE can simultaneously transmit.

[0282] For example, after the UE divides the PSFCH groups for each (interlocked) priority value, the UE may increase the number of PSFCH groups to be transmitted in descending order of priority value (e.g., a larger priority value is interpreted as a higher priority). In this case, when a power limitation situation is reached, (A) the UE may omit (all) transmissions for the PSFCH group of the last involved priority (hereinafter, PF_GR_PL) (which leads to a power limitation situation), and / or (B) in order to avoid reaching the power limitation situation, the UE may determine / select how many PSFCHs to perform among the PSFCHs included in the PF_GR_PL according to the UE implementation. In addition, for example, when transmitting the highest priority PSFCH group, if a power limitation situation is reached, in order not to reach the power limitation situation, the UE may determine / select how many PSFCH transmissions to perform among the PSFCHs included in the PSFCH group according to the UE implementation.

[0283] For example, (in the above-mentioned example scenario (in which the rules are applied) (e.g., power limitation scenario)), the minimum number of PSFCHs transmitted simultaneously may be configured as the (total) number of PSFCHs having a priority higher than or equal to the PSFCH of priority K and / or the (total) number of PSFCHs belonging to a PSFCH group (hereinafter, NPF_K). For example, (in the above-mentioned example scenario (in which the rules are applied) (e.g., power limitation scenario)), the minimum number of PSFCHs transmitted simultaneously may be configured as the (total) number of PSFCHs having a priority lower than or equal to the PSFCH of priority K and / or the (total) number of PSFCHs belonging to a PSFCH group (hereinafter, NPF_K). For example, (in the above-mentioned example scenario (in which the rules are applied) (e.g., power limitation scenario)), the minimum number of PSFCHs transmitted simultaneously may be configured as the maximum value between NPF_K and 1. Here, for example, when PSFCH transmission is performed for the (total) number of PSFCHs having a priority higher than or equal to the PSFCH of priority K and / or the (total) number of PSFCHs belonging to the PSFCH group, a power limitation situation should not be reached. For example, when PSFCH transmission is performed for the (total) number of PSFCHs having a priority lower than or equal to the PSFCH of priority K and / or the (total) number of PSFCHs belonging to the PSFCH group, a power limitation situation should not be reached.

[0284] Based on embodiments of the present disclosure, a UE may be configured to apply restrictions to preempted resources only when the UE reserves (transmission) resources with a (transmission) resource reservation period that is longer than a preconfigured threshold. For example, the UE may be configured to apply restrictions to preempted resources only when the UE reserves (transmission) resource reservation period that is shorter than a preconfigured threshold. For example, the preempted resources may be resources for which a preemption check is performed. For example, these restrictions may be restrictions on a (future) time domain.

[0285] For example, when the UE reserves (transmission) resources with a (transmission) resource reservation period (P) longer than a (pre-configured) threshold in the interval from (SL logical) slot #K to (SL logical) slot #(K+P), the UE may be configured to perform preemption check and / or application only for the reserved resources corresponding to the (SL logic) of the cycle interval including slot #(K+P) (e.g., slot #(K+P) to slot #(K+2P-1)) and / or (SL logical) slot #(K+P), and the UE may be configured not to perform preemption check and / or application for subsequent (cycle-related) resources (hereinafter, F_RSC).

[0286] For example, when the UE reserves (transmission) resources with a (transmission) resource reservation period (P) shorter than a (pre-configured) threshold in the interval from (SL logical) slot #K to (SL logical) slot #(K+P), the UE may be configured to perform preemption check and / or application only for the reserved resources corresponding to the (SL logic) of the cycle interval including slot #(K+P) (e.g., slot #(K+P) to slot #(K+2P-1)) and / or (SL logical) slot #(K+P), and the UE may be configured not to perform preemption check and / or application for subsequent (cycle-related) resources (hereinafter, F_RSC).

[0287] For example, (in the above example scenario) the information about the (future) time interval in which the preemption check and / or application is performed and / or the information about the number of resource reservation periods may be configured to the UE by the base station / network, or may be preconfigured. For example, (in the above example scenario) the information about the (future) time interval in which the preemption check and / or application is performed and / or the information about the number of resource reservation periods may be configured to the UE by the base station / network, or may be preconfigured specifically by the resource pool. For example, (in the above example scenario) the information about the (future) time interval in which the preemption check and / or application is performed and / or the information about the number of resource reservation periods may be configured to the UE by the base station / network, or may be preconfigured specifically by the service type. For example, (in the above example scenario) the information about the (future) time interval in which the preemption check and / or application is performed and / or the information about the number of resource reservation periods may be configured to the UE by the base station / network, or may be preconfigured specifically by the (resource pool) congestion level (e.g., CBR).

[0288] For example, for preemption checking and / or for resource reselection operations (based on preemption), the above-mentioned rules can be configured for the UE to be restrictively applied only when the resource reservation period is greater than the processing time T3 required for sensing and / or generating (to be transmitted) channels / signals. For example, the UE may not perform preemption checking and / or application for F_RSC.

[0289] For example, when the resource reservation period is less than or equal to the processing time (T3) required to sense and / or generate (to transmit) channels / signals, etc., the preemption check and / or application for F_RSC may be configured to be performed by the UE implementation. For example, when the resource reservation period is less than or equal to the processing time (T3) required to sense and / or generate (to transmit) channels / signals, etc., the UE may be configured to perform the preemption check and / or application for F_RSC only when the UE has MAC PDUs and / or (interlocked) LCH related data to be sent on F_RSC. For example, when the resource reservation period is less than or equal to the processing time (T3) required to sense and / or generate (to transmit) channels / signals, etc., the UE may be configured to always perform the preemption check and / or application for F_RSC.

[0290] Based on the embodiments of the present disclosure, when the UE converts the transmission resource reservation period (P_TX, milliseconds) into the number of (SL logical) time slots, the UE can obtain the number of (SL logical) time slots based on the formula CEILING(N / Y*P_TX). Here, for example, the Y parameter can be the number of (UL) time slots based on the (interlocked) parameter set (e.g., subcarrier spacing) signaled from the PSBCH within a 20ms interval. For example, the Y parameter can be the total number of (actual) (UL) time slots included in the (UL) time slots based on the (interlocked) parameter set signaled from the PSBCH within a 20ms interval (based on the Uu communication parameter set) (the number / position of symbols that satisfy the SL parameter set and / or constitute the SL time slot). For example, the X parameter can be the number of (UL) time slots that can be designated as SL time slots. For example, the X parameter can be the number of (UL) time slots to which a bitmap associated with a resource pool for SL communication can be applied. In the present disclosure, for example, a time slot can be (broadly) interpreted as a physical time slot or a (SL) logical time slot.

[0291] Based on the embodiments of the present disclosure, a UE within the coverage of the network and in the (RRC) idle state may not expect that the SCS value and / or CP type / length (configured by the network / base station) of the reference TDD UL / DL configuration for deriving the TDD UL / DL configuration field value / configuration on the PSBCH is configured differently from the SCS value and / or CP type / length related to the SL communication. For example, an out-of-coverage UE located outside the coverage of the network may not expect that the SCS value and / or CP type / length (configured by the network / base station) of the reference TDD UL / DL configuration for deriving the TDD UL / DL configuration field value / configuration on the PSBCH is configured differently from the SCS value and / or CP type / length related to the SL communication. For example, the UE may determine that the SCS value and / or CP type / length of the reference TDD UL / DL configuration for deriving the TDD UL / DL configuration field value / configuration on the PSBCH is the same as the SCS value and / or CP type / length related to the SL communication.

[0292] Based on the embodiments of the present disclosure, in the case of periodic resource reservation, the TX UE can be configured (with restrictions) so that the remaining PDB value associated with the TB has a relationship that is smaller than the resource reservation period value (P). For example, in the case of periodic resource reservation, the TX UE can be configured (with restrictions) so that the size of the selection window has a relationship that is smaller than the resource reservation period value (P). For example, the remaining PDB value associated with the TB can be provided by a higher layer. For example, the size of the selection window can be the size of the selection window associated with TB transmission. For example, the transmission of the TB with the remaining PDB value can be completed within the period.

[0293] For example, in the case where the above rules are applied, a preemption check for reserved resources on time slot M belonging to the Nth cycle can be performed in time slot M-T3 (for example, time slot M-T3 can be interpreted / considered to be the lower limit value / position of the (starting point) of the selection window (related to TB transmission). For example, because the size of the selection window is smaller than the limit of the resource reservation cycle value and the limit of the (pre-configured) upper limit value T3, there may be a problem in which the selection window related to resource reselection for the preempted reserved resources on time slot M belonging to the Nth cycle is not correctly determined (for example, the (maximum possible) end point and / or starting point of the selection window does not cover (all or part of) the Nth cycle domain, and / or there is no guarantee that there are candidate resources that can be selected in the Nth cycle domain, and / or candidate resources that cannot be used as reselected resources for the preempted reserved resources on time slot M are included in the selection window, etc.). In order to solve such problems, it can be configured to apply the following (some) rules.

[0294] For example, the lower limit value / position of the (starting point) of the selection window associated with the resource reselection for the preempted reserved resources on the time slot M belonging to the Nth cycle can be set to the (time slot) time before T3 from the starting point of the Nth cycle. For example, the lower limit value / position of the (starting point) of the selection window associated with the resource reselection for the preempted reserved resources on the time slot M belonging to the Nth cycle can be set to the (time slot) time before T3 from the time slot time to which the earliest / previous reserved resources (in the time domain) within the Nth cycle belong. For example, the lower limit value / position of the (starting point) of the selection window associated with the resource reselection for the preempted reserved resources on the time slot M belonging to the Nth cycle can be set to the (time slot) time before T3 from the time slot M. Herein, for example, if the corresponding rule is applied, it can be interpreted that the time when the resource reselection based on the preemption is triggered and the lower limit value / position of the (starting point) of the relevant selection window are different.

[0295] For example, if the (maximum possible) end point and / or starting point of the selection window does not cover (all or part of) the Nth cycle domain (as described above), the TX UE may perform resource reselection for the preempted reserved resources on time slot M by only considering candidate resources in the covered domain (within the Nth cycle domain). For example, if candidate resources that cannot be used as reselected resources for the preempted reserved resources on time slot M are included in the selection window, the TX UE may perform resource reselection for the preempted reserved resources on time slot M by only considering the remaining candidate resources excluding the candidate resources that cannot be used. For example, if there are no candidate resources that can be selected through resource reselection for the preempted reserved resources on time slot M within the selection window, the TX UE may be configured to trigger resource reselection again (until there are candidate resources that can be selected within the selection window). For example, if there are no candidate resources that can be selected through resource reselection for the preempted reserved resources on time slot M within the selection window, the TX UE may be configured to skip the relevant TB (re)transmission.

[0296] According to an embodiment of the present disclosure, if resource reselection is triggered based on a preemption check operation, the TX UE may be configured to perform actual resource reselection only when the following condition(s) are met. For example, if transmission is missed on existing resources based on a congestion control operation and resource reselection is triggered to compensate for the missed transmission, the TX UE may be configured to perform actual resource reselection only when the following condition(s) are met.

[0297] For example) if the CR_LIMIT associated with the congestion control (e.g., the maximum number of subchannels available for transmission / resource reservation within the CR evaluation window) is not reached, and / or if the (currently) derived CR value compared to the CR_LIMIT associated with the congestion control is less than a preconfigured threshold offset, and / or if the (currently) derived CR value compared to the CR_LIMIT associated with the congestion control is less than a preconfigured threshold ratio, and / or

[0298] Example) If the difference between the (current) derived CR value and the CR_LIMIT associated with congestion control is greater than or equal to the (above) number of subchannels required for reselection, and / or

[0299] Example) if the service has a higher priority than a preconfigured threshold level, and / or if the service has a lower priority than a preconfigured threshold level, and / or if the congestion level (e.g., CBR) (within the resource pool) is lower than a preconfigured threshold, and / or if the congestion level (e.g., CBR) (within the resource pool) is higher than the preconfigured threshold, and / or if the TX UE performs periodic resource reservation, and / or if the TX UE does not perform periodic resource reservation, and / or if the TX UE performs retransmission based on SL HARQ feedback, and / or if the TX UE does not perform retransmission based on SL HARQ feedback.

[0300] Based on an embodiment of the present disclosure, when a Mode 1 DCI received on a licensed carrier schedules SL transmission on an ITS dedicated carrier, monitoring of a (pre-configured) Uu DCI format (e.g., DCI format 0_0 / 1_0 or DCI format 0_1 / 1_1) on a search space (hereinafter, ITS_MODE1SS) configured for monitoring the corresponding Mode 1 DCI may be configured together. Typically, field configurations / payload sizes such as those associated with the Uu DCI format monitored within a search space (SS) are derived based on parameters / configurations of the scheduled carrier associated with the corresponding SS. However, in the case of the example scenario described above, since Uu communication is not performed on an ITS dedicated carrier, the field configurations / payload sizes associated with the Uu DCI format are unclear within the ITS_MODE1SS. Therefore, the following (some) rules may be applied. In the present disclosure, for example, a carrier may be interpreted as or extended to a (serving) cell.

[0301] For example, the UE may not perform monitoring of the Uu DCI format within ITS_MODE1SS.

[0302] For example, the base station may configure the UE with scheduled Uu carrier information related to the Uu DCI format monitored in ITS_MODE1SS.

[0303] For example, the UE may assume / consider / determine that information such as payload size and / or field configuration related to the Uu DCI format monitored within ITS_MODE1SS is pre-configured, but the related Uu communication will not actually be performed on the ITS dedicated carrier. For example, the UE may assume / consider / determine that it does not actually monitor the (corresponding) Uu DCI format within ITS_MODE1SS. For example, the UE may assume / consider / determine that it does actually monitor the (corresponding) Uu DCI format within ITS_MODE1SS. For example, the UE may assume / consider / determine that the (corresponding) Uu DCI format within ITS_MODE1SS is not (exceptional) considered in the (UE's) DCI size budget number count and / or Mode 1 DCI size fitting. For example, the UE may assume / consider / determine that the (corresponding) Uu DCI format within ITS_MODE1SS is (exceptional) considered in the (UE's) DCI size budget number count and / or Mode 1 DCI size fitting.

[0304] Based on an embodiment of the present disclosure, in the case of periodic resource reservation, the UE may be configured to exclude only the first (initial) PSCCH / PSSCH reserved resources associated with TB transmission in the first (initial) period from resource reselection targets based on preemption check and / or preemption resource determination, and for the first (initial) PSCCH / PSSCH reserved resources associated with (each) TB transmission in each subsequent period, the UE may be configured to apply a resource reselection operation based on preemption check and / or preemption resource determination. Herein, for example, in the case of non-periodic resource reservation, only the first (initial) PSCCH / PSSCH selection / reservation resources associated with TB transmission may be excluded from resource reselection targets based on preemption check and / or preemption resource determination.

[0305] According to an embodiment of the present disclosure, in the case of Mode 1 DCI, the search space (SS) and / or related hash parameters for which Mode 1 DCI is monitored may be derived / formed based on parameters and / or CIF values ​​(e.g., in the case of a PCell, the CIF value is considered to be 0) related to the carrier (including the (DL) BWP) on which the Mode 1 DCI is received (or, the carrier on which SL transmission scheduled by Mode 1 DCI is performed (e.g., this may be limitedly applied when SL transmission scheduled by Mode 1 DCI is performed on a permitted carrier)). For example, the search space (SS) and / or related hash parameters for which Mode 1 DCI is monitored may be derived / formed based on (separately) pre-configured parameters (e.g., a CIF value (having zero), etc.). For example, the SS for which Mode 1 DCI is monitored may be configured to always overlap (partially or completely) with the SS associated with monitoring of the Uu DCI format (of a pre-configured type) of the (permitted) carrier that schedules the corresponding Mode 1 DCI. Herein, for example, in the present disclosure, a carrier may be interpreted or extended to a (serving) cell. In addition, for example, the rules proposed in the present disclosure may be applied only when SL transmission scheduled by Mode 1 DCI is performed on an ITS dedicated carrier.

[0306] Based on the embodiments of the present disclosure, when the UE transmits a HARQ feedback disabled MAC PDU by using the second SCI format including the (service-related target) minimum communication range field and / or the area ID field, the UE may set the field value to zero. For example, when the UE transmits a HARQ feedback disabled MAC PDU by using the second SCI format including the (service-related target) minimum communication range field and / or the area ID field, the UE may set the field value to a pre-configured value.

[0307] Based on the embodiments of the present disclosure, in the case of mode 1 operation, the interval between the PSCCH / PSSCH retransmission resource time (associated with one TB) and the PSFCH reception time can be guaranteed to be equal to or greater than the (pre-configured) minimum processing time (MIN_PT) only when the following (some) conditions are met.

[0308] Example), if there is (at least) one HARQ feedback enabled LCH among the LCHs mapped to Mode 1 SL grant

[0309] In addition, for example, if a Mode 1 PSCCH / PSSCH retransmission resource is scheduled without a guaranteed MIN_PT, the UE may be configured not to (re)transmit a HARQ feedback-enabled MAC PDU by using the resource. For example, even if a HARQ feedback-enabled LCH is mapped to a Mode 1 SL grant, if a Mode 1 PSCCH / PSSCH retransmission resource is scheduled without a guaranteed MIN_PT, the UE may be configured not to (re)transmit a HARQ feedback-enabled MAC PDU by using the resource.

[0310] Based on the embodiments of the present disclosure, aperiodic CSI information related to Uu communication can be reported via PUSCH. In this case, if the PUSCH transmission overlaps with the PUCCH transmission (in the time domain) including SL HARQ feedback information, the UE can be exceptionally configured to piggyback the SL HARQ feedback information on the PUSCH.

[0311] Furthermore, when the UE determines whether to reselect selected resources based on a preemption check or a reassessment check, if the UE reselects all resources in time slots starting from time slot N and located after the resource reservation period value configured in the resource pool due to the UE's inability to monitor time slot N, a problem may arise in which all periodically reserved resources should be reselected. Therefore, a method for solving the above problem and a device supporting the method must be proposed.

[0312] According to the embodiments of the present disclosure, in the case of Mode 2 operation, a time slot (e.g., time slot N) that is not monitored due to the transmit operation of the TX UE may exist within the sensing window. In this case, the TX UE may (virtually) assume / determine that another UE has already performed resource reservation on time slot N based on the allowed resource reservation period candidate value (hereinafter referred to as P_CANDI) in the resource pool, and the TX UE may determine the candidate resources that can be selected within the selection window. In this case, for example, the TX UE cannot select / reserve resources that (partially or completely) overlap with resources on time slot (N+P_CANDI) as its own transmit resources.

[0313] Figure 15 A method of selecting resources within a selection window by considering time slots not monitored by a TX UE according to an embodiment of the present disclosure is shown. Figure 15 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0314] exist Figure 15In the embodiment of FIG5 , it is assumed that P_CANDI configured for the resource pool is P1 and P2 and the TX UE cannot monitor time slot N within the sensing window. For example, the TX UE may not be able to perform monitoring of time slot N due to its own transmission in time slot N. In this case, the TX UE may not be able to select resources on time slot (N+P_CANDI) as transmission resources.

[0315] Specifically, refer to Figure 15 , the TX UE may not be able to select resources on time slot (N+P1), time slot (N+2*P1), time slot (N+3*P1), time slot (N+P2), time slot (N+2*P2) and time slot (N+3*P2) as candidate resources.

[0316] For example, the UE may perform a preemption check or a re-evaluation check on a reserved / selected resource signaled by SCI (at a previous time) or a UE-internal selected resource (hereinafter, RSC_K) that is not signaled by SCI on time slot K. In this case, if the resource selected / reserved by the UE (signaled by SCI) (hereinafter, RSC_M) is located before the time from time slot K (e.g., a resource located in time slot M, where M is a value less than K), and / or if RSC_M is included in the sensing window for preemption check, re-evaluation check, or determining whether to perform resource reselection on RSC_K on time slot K, and / or if time slot (M+P_CANDI) overlaps with time slot K, the UE may be configured to perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection on RSC_K on time slot K by applying the following (some) rules.

[0317] For example, the UE may exclude from P_CANDI the resource reservation period candidate values ​​that result in the value M+P_CANDI being equal to the value K, and the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect RSC_K for time slot K by considering only the remaining resource reservation period candidate values. For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect RSC_K for time slot K by considering only the pre-configured resource reservation period candidate values ​​among P_CANDI. For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect RSC_K for time slot K by considering only a pre-configured number of randomly selected resource reservation period candidate values ​​among P_CANDI. For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect RSC_K for time slot K by considering all P_CANDI allowed in the resource pool. For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect RSC_K for time slot K without considering all P_CANDI allowed in the resource pool. In this case, for example, it can be interpreted as a form of not applying an operation of excluding candidate resources on the time slot (M+P_CANDI). For example, the UE may assume that RSC_K always satisfies the preemption condition, and the UE may perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection on RSC_K on time slot K. For example, the UE may assume that RSC_K does not always satisfy the preemption condition, and the UE may perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection on RSC_K on time slot K.

[0318] For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is less than a pre-configured pre-emption-related priority threshold, the UE may exclude resource reservation period candidate values ​​that result in an M+P_CANDI value equal to a K value from P_CANDI, and the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering only the remaining resource reservation period candidate values. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is less than a pre-configured pre-emption-related priority threshold, the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering only the pre-configured resource reservation period candidate values ​​among P_CANDI. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is less than a pre-configured pre-emption-related priority threshold, the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering only a pre-configured number of randomly selected resource reservation period candidate values ​​among P_CANDI. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is less than a pre-configured pre-emption-related priority threshold, the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering all P_CANDI allowed in the resource pool. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or sent on RSC_M) is less than a pre-configured pre-emption-related priority threshold, the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K without considering all P_CANDI allowed in the resource pool. In this case, for example, it can be interpreted as a form of not applying an operation of excluding candidate resources on time slot (M+P_CANDI).For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is less than a pre-configured pre-emption-related priority threshold, the UE may assume that RSC_K always satisfies the pre-emption condition, and the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is less than a pre-configured pre-emption-related priority threshold, the UE may assume that RSC_K does not always satisfy the pre-emption condition, and the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K.

[0319] For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is greater than a pre-configured pre-emption-related priority threshold, the UE may exclude the resource reservation period candidate values ​​that result in the M+P_CANDI value being equal to the K value from P_CANDI, and the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering only the remaining resource reservation period candidate values. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is greater than a pre-configured pre-emption-related priority threshold, the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering only the pre-configured resource reservation period candidate values ​​among P_CANDI. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is greater than a pre-configured pre-emption-related priority threshold, the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering only a pre-configured number of randomly selected resource reservation period candidate values ​​among P_CANDI. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is greater than a pre-configured pre-emption-related priority threshold, the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering all P_CANDI allowed in the resource pool. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or sent on RSC_M) is greater than a pre-configured preemption-related priority threshold, the UE may perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K without considering all P_CANDI allowed in the resource pool. In this case, for example, it can be interpreted as a form of not applying an operation of excluding candidate resources on time slot (M+P_CANDI).For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is greater than a pre-configured pre-emption-related priority threshold, the UE may assume that RSC_K always satisfies the pre-emption condition, and the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K. For example, if the UE sends an actual packet (e.g., MAC PDU) on RSC_M, and / or if the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or to be sent on RSC_M) is greater than a pre-configured pre-emption-related priority threshold, the UE may assume that RSC_K does not always satisfy the pre-emption condition, and the UE may perform a pre-emption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K.

[0320] For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection on RSC_K by considering the resource reservation period (of another UE) derived from the SCI actually successfully received / decoded on time slot M. For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection on RSC_K by considering the selected / reserved resources (O_RSC) (of another UE) derived from the SCI actually successfully received / decoded on time slot M. For example, if the UE obtains the resource reservation period (of another UE) from the SCI actually successfully received / decoded on time slot M, and if the RSRP measurement value obtained based on the (associated) PSSCH (or PSCCH) DMRS exceeds a pre-configured threshold, the UE may perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection on RSC_K by considering the resource reservation period (of another UE) derived from the SCI actually successfully received / decoded on time slot M. For example, if the UE determines the selected / reserved resources (O_RSC) (of another UE) from the SCI actually successfully received / decoded on time slot M, and if the RSRP measurement value obtained based on the (associated) PSSCH (or PSCCH) DMRS exceeds a pre-configured threshold, the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect resources for RSC_K by considering the selected / reserved resources (O_RSC) (of the other UE). Herein, for example, O_RSC and RSC_K may partially or completely overlap. For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect resources for RSC_K by (additionally) considering the pre-configured resource reservation period (of the other UE). For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect resources for RSC_K by (additionally) considering the pre-configured selected / reserved resources (O_RSC) (of the other UE). For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering all P_CANDI allowed in the resource pool. For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering only pre-configured resource reservation period candidate values ​​among P_CANDI. For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to perform resource reselection for RSC_K on time slot K by considering only a pre-configured number of randomly selected resource reservation period candidate values ​​among P_CANDI.For example, the UE may exclude from P_CANDI the resource reservation period candidate values ​​that result in the M+P_CANDI value being equal to the K value, and the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect resources for RSC_K on time slot K by considering only the remaining resource reservation period candidate values. For example, the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect resources for RSC_K on time slot K without considering all P_CANDI allowed in the resource pool. For example, the UE may assume that RSC_K always satisfies the preemption condition, and the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect resources for RSC_K on time slot K. For example, the UE may assume that RSC_K does not always satisfy the preemption condition, and the UE may perform a preemption check, a re-evaluation check, or determine whether to reselect resources for RSC_K on time slot K. For example, if RSC_K (partially) overlaps with O_RSC, the UE may reselect different RSC_K-related resources. For example, the above embodiment can be applied to the following situations: the UE does not send an actual packet (e.g., MAC PDU) on RSC_M and / or the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or sent on RSC_M) is greater than a pre-configured preemption-related priority threshold. For example, the above embodiment can be applied to the following situations: the UE does not send an actual packet (e.g., MAC PDU) on RSC_M and / or the priority value of the packet (e.g., MAC PDU) to be sent by the UE on RSC_K (or sent on RSC_M) is less than a pre-configured preemption-related priority threshold.

[0321] Herein, for example, the above-described (some) rules may be (with limitation) applied only to the (sensing) purpose of checking whether RSC_K is a preempted resource. In other words, for example, when the MAC layer performs reselection of relevant resources because RSC_K is determined to be a preempted resource, reselection may be performed based on a set of resources reported as idle (IDLE) resources (i.e., a common sensing result that can be interpreted as a transmission resource selection in Mode 2) among the remaining resources after excluding resources (in the selection window) that (partially or completely) overlap with resources on the time slot (M+P_CANDI) through the PHY layer.

[0322] Whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE in a resource pool specific manner (or independently or differently). For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE in a service / packet type specific manner (or independently or differently). For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE in a service / packet priority specific manner (or independently or differently). For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE in a QoS requirement (e.g., URLLC / EMBB traffic, reliability, delay) specific manner (or independently or differently). For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE in a broadcast type (e.g., unicast, multicast, broadcast) specific manner (or independently or differently). For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE in a (resource pool) congestion level (e.g., CBR) specific manner (or independently or differently). For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE in a specific manner (or independently or differently) for the SL HARQ feedback scheme (e.g., NACK feedback only, ACK / NACK feedback). For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE independently or differently depending on whether the resource reservation period is less than or greater than a pre-configured threshold. For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE independently or differently depending on whether the PUCCH-based SL HARQ feedback reporting operation is configured. For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE independently or differently depending on whether the resource reservation period exceeds a (pre-configured) threshold. For example, if the resource reservation period value does not exceed the threshold, the proposed rules / method can be applied restrictively. For example, whether the rules proposed in the present disclosure are applicable and / or related parameters can be configured for the UE independently or differently depending on whether (non-)periodic resource reservation is performed. For example, according to a preemption operation or a pre-evaluation operation, whether the rules proposed in the present disclosure are applicable and / or related parameters may be configured independently or differently for the UE.

[0323] Based on the embodiments of the present disclosure, the UE may perform sensing-based resource reselection according to the procedures defined in Tables 8 and 9. Based on the embodiments of the present disclosure, the UE may perform resource reselection based on preemption or reassessment according to the procedures defined in Tables 8 to 10. Tables 8 to 10 may be combined with various embodiments of the present disclosure.

[0324] [Table 8]

[0325]

[0326]

[0327] [Table 9]

[0328]

[0329]

[0330] [Table 10]

[0331]

[0332] Figure 16 A method for performing wireless communication by a first device according to an embodiment of the present disclosure is shown. Figure 16 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0333] Reference Figure 16 , in step S1610, the first device may perform a first sensing within a first sensing window. In step S1620, the first device may select a first side link (SL) resource on the first time slot and a second SL resource on the second time slot based on the first sensing. In step S1630, the first device may determine a second sensing window based on a request for a preemption check for the second SL resource. In step S1640, the first device may determine a plurality of candidate resources based on the second sensing performed within the second sensing window. For example, based on the fact that the first device does not monitor the first time slot, the second SL resource on the second time slot may be excluded from the plurality of candidate resources based on at least one resource reservation period value configured for the resource pool. In step S1650, the first device may determine, based on excluding the second SL resource from the plurality of candidate resources, whether to perform preemption-based resource reselection on the second SL resource excluded from the plurality of candidate resources based on a priority value associated with a first medium access control (MAC) protocol data unit (PDU).

[0334] For example, the first MAC PDU may be a MAC PDU to be sent on the second SL resource.

[0335] In addition, for example, the first device may send sidelink control information (SCI) and the second MAC PDU on the first SL resource. For example, based on the first device sending the SCI and the second MAC PDU on the first SL resource, the first device may not monitor the first time slot.

[0336] For example, based on a reference signal received power (RSRP) measurement value associated with the second SL resource being greater than a threshold, the first device may reselect the second SL resource excluded from the plurality of candidate resources based on a priority value associated with the first MAC PDU. For example, the RSRP measurement value associated with the second SL resource may be obtained based on a demodulation reference signal (DMRS) on a physical sidelink control channel (PSCCH) through which sidelink control information (SCI) including information associated with resources overlapping with the second SL resource is transmitted. For example, the RSRP measurement value associated with the second SL resource may be obtained based on a demodulation reference signal (DMRS) on a physical sidelink shared channel (PSSCH) scheduled by sidelink control information (SCI) including information associated with resources overlapping with the second SL resource. In addition, for example, the first device may send the first MAC PDU based on the reselected resource.

[0337] For example, based on a reference signal received power (RSRP) measurement value associated with the second SL resource being less than or equal to a threshold, the first device may not reselect the second SL resource excluded from the plurality of candidate resources. In addition, for example, the first device may send the first MAC PDU based on the second SL resource.

[0338] In addition, for example, the first device may receive side link control information (SCI) including information related to a fourth SL resource from the second device based on the third SL resource. For example, the fourth SL resource may overlap with the second SL resource. For example, based on the fact that a priority value related to a first MAC PDU to be sent by the first device on the second SL resource is greater than a priority value related to a third MAC PDU to be sent by the second device on the fourth SL resource, and based on the fact that a reference signal received power (RSRP) measurement value obtained based on a demodulation reference signal (DMRS) on the third SL resource is greater than a threshold, the first device may reselect the second SL resource excluded from the plurality of candidate resources. For example, the priority value related to the third MAC PDU to be sent by the second device on the fourth SL resource may be less than a preconfigured priority value.

[0339] For example, the resource reservation period value selected by the first device from at least one resource reservation period value configured for the resource pool may be greater than the remaining packet delay budget (PDB). For example, the interval between the first time slot and the second time slot may be equal to N times the resource reservation period value, where N may be a positive integer. For example, the interval between the first time slot and the second time slot may be less than the resource reservation period value.

[0340] In addition, for example, the first device may determine a search space related to downlink control information (DCI) for SL scheduling based on a carrier indication field (CIF) value having zero, and the first device may monitor at least one physical downlink control channel (PDCCH) candidate within the search space. In addition, for example, the first device may receive DCI from a base station, and the first device may perform SL communication based on SL resources scheduled by the DCI.

[0341] The proposed method can be applied to devices based on various embodiments of the present disclosure. First, the processor 102 of the first device 100 can perform a first sensing within a first sensing window. In addition, the processor 102 of the first device 100 can select a first side link (SL) resource on a first time slot and a second SL resource on a second time slot based on the first sensing. In addition, the processor 102 of the first device 100 can determine a second sensing window based on a request for a preemption check of the second SL resource. In addition, the processor 102 of the first device 100 can determine a plurality of candidate resources based on the second sensing performed within the second sensing window. For example, based on the fact that the first device does not monitor the first time slot, the second SL resource on the second time slot can be excluded from the plurality of candidate resources based on at least one resource reservation period value configured for the resource pool. In addition, the processor 102 of the first device 100 can determine whether to perform preemption-based resource reselection on the second SL resource excluded from the plurality of candidate resources based on a priority value associated with a first medium access control (MAC) protocol data unit (PDU) based on excluding the second SL resource from the plurality of candidate resources.

[0342] Based on an embodiment of the present disclosure, a first device suitable for performing wireless communication can be provided. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: perform first sensing within a first sensing window; select a first side link (SL) resource on a first time slot and a second SL resource on a second time slot based on the first sensing; determine a second sensing window based on a request for a preemption check of the second SL resource; determine a plurality of candidate resources based on the second sensing performed within the second sensing window, wherein, based on the first device not monitoring the first time slot, the second SL resource on the second time slot is excluded from the plurality of candidate resources based on at least one resource reservation period value configured for a resource pool; and based on excluding the second SL resource from the plurality of candidate resources, determine whether to perform preemption-based resource reselection on the second SL resource excluded from the plurality of candidate resources based on a priority value associated with a first medium access control (MAC) protocol data unit (PDU).

[0343] Based on an embodiment of the present disclosure, a device suitable for controlling a first user equipment (UE) performing wireless communication can be provided. 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 the instructions to: perform a first sensing within a first sensing window; select a first side link (SL) resource on a first time slot and a second SL resource on a second time slot based on the first sensing; determine a second sensing window based on a request for a preemption check of the second SL resource; determine a plurality of candidate resources based on the second sensing performed within the second sensing window, wherein, based on the first UE not monitoring the first time slot, the second SL resource on the second time slot is excluded from the plurality of candidate resources based on at least one resource reservation period value configured for the resource pool; and based on excluding the second SL resource from the plurality of candidate resources, determine whether to perform preemption-based resource reselection on the second SL resource excluded from the plurality of candidate resources based on a priority value associated with a first medium access control (MAC) protocol data unit (PDU).

[0344] Based on an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, when the instructions are executed, they may cause a first device to: perform a first sensing within a first sensing window; select a first side link (SL) resource on a first time slot and a second SL resource on a second time slot based on the first sensing; determine a second sensing window based on a request for a preemption check of the second SL resource; determine a plurality of candidate resources based on the second sensing performed within the second sensing window, wherein, based on the first device not monitoring the first time slot, the second SL resource on the second time slot is excluded from the plurality of candidate resources based on at least one resource reservation period value configured for a resource pool; and based on excluding the second SL resource from the plurality of candidate resources, determine whether to perform preemption-based resource reselection on the second SL resource excluded from the plurality of candidate resources based on a priority value associated with a first medium access control (MAC) protocol data unit (PDU).

[0345] According to various embodiments of the present disclosure, even if resources in time slots starting from time slot N and located after the resource reservation period value configured in the resource pool are excluded from the candidate resource set (S_A) due to the UE being unable to monitor time slot N, the UE can ultimately determine whether to reselect the selected resource based on a preemption check based on (i) the priority of the MAC PDU to be transmitted on the selected resource and (ii) the RSRP measured on the resource (e.g., time slot) in which the SCI including information about resources overlapping with the selected resource is transmitted. Accordingly, if the UE that determines whether to reselect the selected resource based on the preemption check is unable to monitor time slot N, the problem that the UE needs to reselect all resources in time slots starting from time slot N and located after the resource reservation period value configured in the resource pool can be solved.

[0346] Various embodiments of the present disclosure may be combined with each other.

[0347] Hereinafter, devices to which respective embodiments of the present disclosure can be applied will be described.

[0348] 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).

[0349] Hereinafter, a more detailed description will be given 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.

[0350] Figure 17 A communication system (1) according to an embodiment of the present disclosure is shown.

[0351] Reference Figure 17 , a communication system (1) to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot (100a), a vehicle (100b-1, 100b-2), an extended reality (XR) device (100c), a handheld device (100d), a home appliance (100e), an Internet of Things (IoT) device (100f), and an artificial intelligence (AI) device / server (400). For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. Handheld devices may include smartphones, 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.

[0352] 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 narrowband IoT for low-power communication. In this case, for example, NB-IoT technology may be an example of low-power wide area network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1 and / or LTE Cat NB2, without being limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on LTE-M technology. In this case, as an example, LTE-M technology may be an example of LPWAN and may be referred to by various names including enhanced machine type communication (eMTC). 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, without being 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, ZigBee technology can generate a personal area network (PAN) related to low / low-power digital communication based on various standards including IEEE 802.15.4, and can be referred to by various names.

[0353] Wireless devices 100a to 100f can connect to a network 300 via a BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to an AI server 400 via the network 300. The network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via the BS 200 / network 300, wireless devices 100a to 100f can perform direct communication (e.g., sidelink communication) with each other without going through the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0354] Wireless communication / connection 150a, 150b, or 150c may be established between wireless devices 100a to 100f / BS 200 or BS 200 / BS 200. Here, the wireless communication / connection may be established via various RATs (e.g., 5G NR), such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device may transmit / receive radio signals to / from each other via the wireless communication / connections 150a and 150b. For example, the wireless communication / connections 150a and 150b may transmit / receive signals via various physical channels. To this end, various configuration information configuration processes, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of the resource allocation process for transmitting / receiving radio signals may be performed based on various proposals of the present disclosure.

[0355] Figure 18 A wireless device according to an embodiment of the present disclosure is shown.

[0356] Reference Figure 18 , the first wireless device (100) and the second wireless device (200) can transmit radio signals through various RATs (e.g., LTE and NR). Herein, {the first wireless device (100) and the second wireless device (200)} may correspond to Figure 17 {wireless device (100x) and BS (200)} and / or {wireless device (100x) and wireless device (100x)} in.

[0357] 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(s) 102 may control the memory(s) 104 and / or the transceiver(s) 106, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. For example, the processor(s) 102 may process information in the memory(s) 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver(s) 106. The processor(s) 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(s) 104. The memory(s) 104 may be connected to the processor(s) 102 and may store various information related to the operation of the processor(s) 102. For example, the memory(s) 104 may store software code including instructions for executing part or all of the processing controlled by the processor(s) 102 or for executing the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document. Here, the processor(s) 102 and the memory(s) 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver(s) 106 may be connected to the processor(s) 102 and transmit and / or receive radio signals via the antenna(s) 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver(s) 106 may be used interchangeably with the radio frequency (RF) unit(s). In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0358] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally further include one or more transceivers 206 and / or one or more antennas 208. The processor(s) 202 may control the memory(s) 204 and / or the transceiver(s) 206, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. For example, the processor(s) 202 may process information in the memory(s) 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver(s) 206. The processor(s) 202 may receive a radio signal including fourth information / signals through the transceiver(s) 106, and then store information obtained by processing the fourth information / signals in the memory(s) 204. The memory(s) 204 may be connected to the processor(s) 202 and may store various information related to the operation of the processor(s) 202. For example, the memory(s) 204 may store software code including instructions for executing part or all of the processing controlled by the processor(s) 202 or for executing the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document. Here, the processor(s) 202 and the memory(s) 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver(s) 206 may be connected to the processor(s) 202 and transmit and / or receive radio signals via the antenna(s) 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver(s) 206 may be used interchangeably with the RF unit(s). In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0359] The hardware elements of wireless devices 100 and 200 will be described in more detail below. One or more protocol layers may be, but are not limited to, implemented by 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, procedures, proposals, methods, and / or operational flows disclosed herein. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed herein. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed herein, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 can receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document.

[0360] The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in the one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. The firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be included in the one or more processors 102 and 202 or stored in one or more memories 104 and 204, thereby being driven by the one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0361] One or more memories 104 and 204 can be connected to one or more processors 102 and 202 and can store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 can be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cash memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 can be located internally and / or externally to one or more processors 102 and 202. One or more memories 104 and 204 can be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0362] One or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels described in the methods and / or operational flows 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 described in the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may transmit and receive radio signals. For example, one or more processors 102 and 202 may control the one or more transceivers 106 and 206 to transmit user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may control the one or more transceivers 106 and 206 to receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 can be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 can be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document via one or more antennas 108 and 208. In this document, one or more antennas can be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 can convert received radio signals / channels, etc. from RF band signals to baseband signals so that the received user data, control information, radio signals / channels, etc. can be processed by one or more processors 102 and 202. One or more transceivers 106 and 206 can convert the user data, control information, radio signals / channels, etc. processed by one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 can include (analog) oscillators and / or filters.

[0363] Figure 19 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0364] Reference Figure 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). Figure 19 operations / functions, not limited to Figure 18 The processor (102, 202) and / or transceiver (106, 206) of Figure 18The processor (102, 202) and / or transceiver (106, 206) are implemented Figure 19 For example, you can Figure 18 Alternatively, the processor (102, 202) can implement blocks 1010 to 1060. Figure 18 The processor (102, 202) implements blocks 1010 to 1050 and can be implemented by Figure 18 The transceiver (106, 206) is used to implement block 1060.

[0365] Can be passed Figure 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 via various physical channels (e.g., PUSCH and PDSCH).

[0366] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbol of each transmission layer can be mapped (precoded) to (one or more) corresponding antenna ports by the precoder 1040. The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 with the N*M precoding matrix W. Here, N is the number of antenna ports and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) on the complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0367] The resource mapper 1050 can 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 can generate a radio signal from the mapped modulation symbols, and the generated radio signal can 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 upconverter.

[0368] Can be used with Figure 19 The signal processing process for the signal received in the wireless device is configured in a manner opposite to the signal processing process (1010-1060) of the wireless device. Figure 18 100, 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal can be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword can be restored to the original information block by decoding. Therefore, a signal processing circuit (not shown) for receiving a signal may include a signal restorer, a resource demapper, a post-coding process, a demodulator, a descrambler, and a decoder.

[0369] Figure 20 Another example of a wireless device according to an embodiment of the present disclosure is shown. The wireless device can be implemented in various forms according to use cases / services (see Figure 17 ).

[0370] Reference Figure 20 , the wireless device (100, 200) may correspond to Figure 18 The wireless devices (100, 200) may be configured by various elements, components, units / portions, and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and additional components (140). The communication unit may include a communication circuit (112) and (one or more) transceivers (114). For example, the communication circuit (112) may include Figure 18 One or more processors (102, 202) and / or one or more memories (104, 204). For example, the transceiver(s) (114) may include Figure 18The control unit (120) is electrically connected to the communication unit (110), the memory (130), and the additional components (140), and controls the overall operation of the wireless device. For example, the control unit (120) can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). The control unit (120) can transmit information stored in the memory unit (130) to the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface in the memory unit (130).

[0371] The additional component (140) may be configured in various ways depending on the type of wireless device. For example, the additional component (140) may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be implemented in the following forms without limitation: a robot ( Figure 17 100a), vehicles ( Figure 17 100b-1 and 100b-2), XR devices ( Figure 17 100c), handheld device ( Figure 17 100d), household appliances ( Figure 17 100e), IoT devices ( Figure 17 100f), digital broadcast terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 17 400), BS( Figure 17 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0372] exist Figure 20In the embodiment of the present invention, the various elements, components, units / parts and / or modules in the wireless device (100, 200) can all be connected to each other through a wired interface, or at least part of them can be connected wirelessly through the communication unit (110). For example, in each of the wireless devices (100, 200), the control unit (120) and the communication unit (110) can be connected through a wired interface, and the control unit (120) and the first unit (e.g., 130, 140) can be connected wirelessly through the communication unit (110). Each element, component, unit / part and / or module in the wireless device (100, 200) can also include one or more elements. For example, the control unit (120) can be constructed by a collection of one or more processors. As an example, the control unit (120) can be constructed 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 constructed by random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, nonvolatile memory, and / or combinations thereof.

[0373] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Figure 20 .

[0374] Figure 21 A handheld device according to an embodiment of the present disclosure is shown. The handheld device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0375] Reference Figure 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 Figure 20 Frame 110 to 130 / 140.

[0376] The communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from other wireless devices or a base station. The control unit 120 can perform various operations by controlling the components of the handheld device 100. The control unit 120 may include an application processor (AP). The memory unit 130 can store data / parameters / programs / codes / commands required to operate the handheld device 100. The memory unit 130 can store input / output data / information. The power supply unit 140a can supply power to the handheld device 100 and may include wired / wireless charging circuits, a battery, etc. The interface unit 140b can support connection between the handheld device 100 and other external devices. The interface unit 140b may include various ports for connecting to external devices (e.g., an audio I / O port and a video I / O port). The I / O unit 140c can input or output user-input video information / signals, audio information / signals, data, and / or information. The I / O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0377] For example, in the case of data communication, the I / O unit 140c can obtain information / signals (e.g., touch, text, voice, image, or video) input by the user, and the obtained information / signals can be stored in the memory unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals and transmit the converted radio signals directly 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.

[0378] Figure 22 A vehicle or autonomous vehicle according to 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.

[0379] Reference Figure 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 Figure 20 Box 110 / 130 / 140.

[0380] The communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, base stations (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling components of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a can cause the vehicle or autonomous vehicle 100 to travel on the road. The drive unit 140a may include an engine, a motor, a transmission system, wheels, brakes, a steering system, etc. The power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can obtain vehicle status, external environment information, user information, etc. The sensor unit 140 c 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 location module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140 d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting the speed (e.g., adaptive cruise control), a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path with a destination set, etc.

[0381] For example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving path and driving plan based on the acquired data. The control unit 120 can control the drive unit 140a so that the vehicle or autonomous driving vehicle 100 can move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 can aperiodically / periodically acquire the latest traffic information data from the external server and acquire surrounding traffic information data from neighboring vehicles. During autonomous driving, the sensor unit 140c can acquire vehicle status and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving path and driving plan based on the newly acquired data / information. The communication unit 110 can transmit information about the vehicle's location, autonomous driving path, and / or driving plan to the external server. The external server can use AI technology, etc. based on the information collected from the vehicle or autonomous driving vehicle to predict traffic information data and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0382] 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 an apparatus, and the technical features in the apparatus claims can be combined to be implemented or performed in a method. In addition, the technical features in (one or more) method claims and (one or more) apparatus claims can be combined to be implemented or performed in an apparatus. In addition, the technical features in (one or more) method claims and (one or more) apparatus 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 the following steps: performing a first sensing within a first sensing window; selecting a first side link (SL) resource on a first time slot and a second side link (SL) resource on a second time slot based on the first sensing; determining a second sensing window based on a request for a preemption check on the second SL resource; determining a plurality of candidate resources based on second sensing performed within the second sensing window, wherein, based on the first device not monitoring the first time slot, excluding the second SL resource on the second time slot from the multiple candidate resources based on at least one resource reservation period value configured for a resource pool; and Based on excluding the second SL resource from the multiple candidate resources, it is determined whether to perform preemption-based resource reselection on the second SL resource excluded from the multiple candidate resources based on a priority value associated with a first medium access control MAC protocol data unit PDU.

2. The method according to claim 1, wherein The first MAC PDU is a MAC PDU to be sent on the second SL resource.

3. The method according to claim 1, further comprising the steps of: Sending side link control information SCI and a second MAC PDU on the first SL resource, Wherein, based on the first device sending the SCI and the second MAC PDU on the first SL resource, the first device does not monitor the first time slot.

4. The method according to claim 1, wherein Based on the reference signal received power RSRP measurement value associated with the second SL resource being greater than a threshold, the first device reselects the second SL resource excluded from the multiple candidate resources based on the priority value associated with the first MAC PDU.

5. The method according to claim 4, wherein The RSRP measurement value related to the second SL resource is obtained based on a demodulation reference signal DMRS on a physical sidelink control channel PSCCH through which sidelink control information SCI including information related to resources overlapping with the second SL resource is transmitted.

6. The method according to claim 4, wherein: The RSRP measurement value related to the second SL resource is obtained based on a demodulation reference signal DMRS on a physical sidelink shared channel PSSCH scheduled by sidelink control information SCI including information related to resources overlapping with the second SL resource.

7. The method according to claim 4, further comprising the steps of: The first MAC PDU is sent based on the reselected resources.

8. The method according to claim 1, wherein Based on the reference signal received power RSRP measurement value related to the second SL resource being less than or equal to a threshold, the first device does not reselect the second SL resource excluded from the multiple candidate resources.

9. The method according to claim 8, further comprising the steps of: The first MAC PDU is sent based on the second SL resources.

10. The method according to claim 1, further comprising the steps of: receiving side link control information SCI including information related to a fourth SL resource from the second device based on the third SL resource, The fourth SL resource overlaps with the second SL resource.

11. The method according to claim 10, wherein: Based on the fact that the priority value associated with the first MAC PDU to be sent by the first device on the second SL resource is greater than the priority value associated with the third MAC PDU to be sent by the second device on the fourth SL resource, and based on the fact that the reference signal received power RSRP measurement value obtained based on the demodulation reference signal DMRS on the third SL resource is greater than a threshold, the first device reselects the second SL resource excluded from the multiple candidate resources.

12. The method according to claim 11, wherein The priority value associated with the third MAC PDU to be sent by the second device on the fourth SL resource is less than a pre-configured priority value.

13. The method according to claim 1, wherein The resource reservation period value selected by the first device from among at least one resource reservation period value configured for the resource pool is greater than a remaining packet delay budget PDB.

14. A first device adapted to perform wireless communication, the first device comprising: at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions being executed by the at least one processor to perform operations comprising: performing a first sensing within a first sensing window; selecting a first side link (SL) resource on a first time slot and a second side link (SL) resource on a second time slot based on the first sensing; determining a second sensing window based on a request for a preemption check on the second SL resource; determining a plurality of candidate resources based on second sensing performed within the second sensing window, wherein, based on the fact that the first device does not monitor the first time slot, the second SL resource on the second time slot is excluded from the multiple candidate resources based on at least one resource reservation period value configured for the resource pool; and Based on excluding the second SL resource from the multiple candidate resources, it is determined whether to perform preemption-based resource reselection on the second SL resource excluded from the multiple candidate resources based on a priority value associated with a first medium access control MAC protocol data unit PDU.

15. A non-transitory computer-readable storage medium storing instructions, wherein: The instructions, when executed, cause the first device to: performing a first sensing within a first sensing window; selecting a first side link (SL) resource on a first time slot and a second side link (SL) resource on a second time slot based on the first sensing; determining a second sensing window based on a request for a preemption check on the second SL resource; determining a plurality of candidate resources based on second sensing performed within the second sensing window, wherein, based on the fact that the first device does not monitor the first time slot, the second SL resource on the second time slot is excluded from the multiple candidate resources based on at least one resource reservation period value configured for the resource pool; and Based on excluding the second SL resource from the multiple candidate resources, it is determined whether to perform preemption-based resource reselection on the second SL resource excluded from the multiple candidate resources based on a priority value associated with a first medium access control MAC protocol data unit PDU.

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