Method and apparatus for performing SL communication based on auxiliary information in NR V2X

Abstract

A method for a first device to perform wireless communication is provided, and an apparatus for supporting the method. The method includes the steps of: transmitting, via a Physical Secondary Link Control Channel (PSCCH), a first Secondary Link Control Information (SCI) to a second device, the SCI including scheduling information regarding a Physical Secondary Link Shared Channel (PSSCH), the first SCI including information related to frequency resource allocation, information related to time resource allocation, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS); and transmitting via the PSSCH, first auxiliary information to the second device, wherein the first auxiliary information may include information for secondary link (SL) resource selection for the second device.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a wireless communication system. BACKGROUND

[0002] A sidelink (SL) communication is a communication scheme in which a direct link is established between user equipments (UEs) and the UEs directly exchange voice and data with each other without intervention of an evolved node B (eNB). The SL communication is under consideration as a solution to eNB overhead caused by rapid increase of data traffic. V2X (vehicle-to-everything) refers to a communication technique by which vehicles exchange information with other vehicles, pedestrians, and objects equipped with infrastructures, etc. The V2X can be divided into four types such as V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). The V2X communication can be provided through a PC5 interface and / or a Uu interface.

[0003] In addition, as more communication devices demand greater communication capacity, there is an increasing need for mobile broadband communication that is enhanced relative to legacy radio access technologies (RATs). Therefore, communication system design considering UEs or services sensitive to reliability and delay has also been discussed. Also, a next-generation radio access technology based on enhanced mobile broadband communication, massive machine type communication (MTC), ultra-reliable low-latency communication (URLLC), etc. can be called a new RAT (radio access technology) or NR (new radio). Herein, the NR can also support vehicle-to-everything (V2X) communication.

[0004] Figure 1 is a diagram for describing NR-based V2X communication compared to V2X communication based on a RAT used prior to the NR. Figure 1 Embodiments of can be combined with various embodiments of the disclosure.

[0005] With respect to V2X communication, when a RAT used prior to the NR is discussed, a scheme of providing a safety service based on a V2X message such as a BSM (basic safety message), a CAM (cooperative awareness message), and a DENM (decentralized environmental notification message) is focused on. The V2X message can include position information, dynamic information, attribute information, etc. For example, a UE can transmit a periodic message type CAM and / or an event triggered message type DENM to another UE.

[0006] Thereafter, with respect to V2X communication, various V2X scenarios are proposed in the NR. For example, the various V2X scenarios can include platooning, advanced driving, extended sensors, remote driving, etc. SUMMARY

[0007] TECHNICAL PROBLEM

[0008] Meanwhile, the first device can transmit assistance information to the second device, and the second device can select the SL resource based on the assistance information. In this case, the form of the assistance information, the condition for using the assistance information, the condition for transmitting the assistance information, and the like need to be defined in detail.

[0009] Technical Solution

[0010] In one embodiment, a method for performing wireless communication by a first device is provided. The method can include transmitting, to a second device, first sidelink control information (SCI) including scheduling information for a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), wherein the first SCI includes information related to a frequency resource assignment, information related to a time resource assignment, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS), and transmitting, to the second device, first assistance information through the PSSCH, wherein the first assistance information includes information for sidelink (SL) resource selection of the second device.

[0011] In one embodiment, a first device adapted to perform wireless communication is provided. The first device can 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 can execute the instructions to transmit, to a second device, first sidelink control information (SCI) including scheduling information for a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), wherein the first SCI includes information related to a frequency resource assignment, information related to a time resource assignment, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS), and transmit, to the second device, first assistance information through the PSSCH, wherein the first assistance information includes information for sidelink (SL) resource selection of the second device.

[0012] Technical Effects

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

[0014] Figure 1 is a diagram for describing NR-based V2X communication compared to V2X communication based on a RAT used before NR.

[0015] Figure 2 A structure of an NR system based on an embodiment of the disclosure is illustrated.

[0016] Figure 3 A radio protocol architecture based on embodiments of the disclosure is shown.

[0017] Figure 4 A structure of a radio frame of NR based on embodiments of the disclosure is shown.

[0018] Figure 5 A structure of a slot of a NR frame based on embodiments of the disclosure is shown.

[0019] Figure 6 An example of a BWP based on embodiments of the disclosure is shown.

[0020] Figure 7 A UE performing V2X or SL communication based on embodiments of the disclosure is shown.

[0021] Figure 8 A procedure for a UE performing V2X or SL communication based on transmission mode based on embodiments of the disclosure is shown.

[0022] Figure 9 Three types of broadcast based on embodiments of the disclosure are shown.

[0023] Figure 10 A resource unit for CBR measurement based on embodiments of the disclosure is shown.

[0024] Figure 11 A procedure for a UE-A transmitting assistance information to a UE-B based on embodiments of the disclosure is shown.

[0025] Figure 12 A procedure for a UE performing SL communication based on assistance information based on embodiments of the disclosure is shown.

[0026] Figure 13 A method for performing wireless communication by a first apparatus based on embodiments of the disclosure is shown.

[0027] Figure 14 A method for performing wireless communication by a second apparatus based on embodiments of the disclosure is shown.

[0028] Figure 15 A communication system 1 based on embodiments of the disclosure is shown.

[0029] Figure 16 A wireless device based on embodiments of the disclosure is shown.

[0030] Figure 17 A signal processing circuit for transmitting a signal based on embodiments of the disclosure is shown.

[0031] Figure 18Another example of a wireless device based on an embodiment of the disclosure is shown.

[0032] Figure 19 A handheld device based on an embodiment of the disclosure is shown.

[0033] Figure 20 A vehicle or autonomous vehicle based on an embodiment of the disclosure is shown. DETAILED DESCRIPTION

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

[0035] A slash ( / ) or comma used in the disclosure can mean "and / or". For example, "A / B" can mean "A and / or B". Thus, "A / B" can mean "only A", "only B", or "both A and B". For example, "A, B, C" can mean "A, B, or C".

[0036] In the disclosure, "at least one of A and B" can mean "only A", "only B", or "both A and B". In addition, in the disclosure, the expression "at least one of A or B" or "at least one of A and / or B" can be interpreted as "at least one of A and B".

[0037] In addition, in the disclosure, "at least one of A, B, and C" can 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" can mean "at least one of A, B, and C".

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

[0039] The technical features described in a set of drawings in the disclosure can be implemented respectively, or can be implemented simultaneously.

[0040] The technology 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. The CDMA can be implemented using radio technology such as universal terrestrial radio access (UTRA) or CDMA-2000. The TDMA can be implemented using radio technology such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). The OFDMA can be implemented using radio technology 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 evolution of IEEE 802.16e, and provides backward compatibility with an IEEE 802.16e-based system. The UTRA is a part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of an evolved UMTS (E-UMTS). The 3GPP LTE uses the OFDMA in downlink and uses the SC-FDMA in uplink. LTE-higher advanced (LTE-A) is an evolution of the LTE.

[0041] 5G NR is a subsequent technology of LTE-A corresponding to a new and full mobile communication system having high performance, low latency, high availability, etc. The 5G NR can use resources of all available frequency spectrums including a low frequency band less than 1 GHz, a middle frequency band from 1 GHz to 10 GHz, and a high frequency (millimeter wave) band of 24 GHz or more.

[0042] 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 disclosure will not be limited thereto.

[0043] Figure 2 The structure of an NR system according to an embodiment of the disclosure is shown. Figure 2 Embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0044] Reference Figure 2The next generation radio access network (NG-RAN) can include BSs 20 that provide user plane and control plane protocol terminations towards the UE 10. For example, the BS 20 can include a next generation NodeB (gNB) and / or an evolved NodeB (eNB). For example, the UE 10 can be fixed or mobile, and can be referred to as other terminology, such as a mobile station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), wireless device, etc. For example, the BS can be referred to as a fixed station that communicates with the UE 10 and can be referred to as other terminology, such as a base transceiver system (BTS), access point (AP), etc.

[0045] Figure 2 Embodiments of the disclosure exemplify a case where only gNBs are included. The BSs 20 can be connected to each other via an Xn interface. The BSs 20 can be connected to each other via a fifth generation (5G) core network (5GC) and an NG interface. More specifically, the BSs 20 can be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and can be connected to a user plane function (UPF) 30 via an NG-U interface.

[0046] Radio interface protocol layers between the UE and the network can be classified as a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the open system interconnection (OSI) model commonly known in communication systems. Among them, the physical (PHY) layer belonging to the first layer provides an information transfer service using a physical channel, and the radio resource control (RRC) layer located at the third layer controls radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0047] Figure 3 A radio protocol architecture based on embodiments of the disclosure is shown. Figure 3 Embodiments of the disclosure can be combined with various embodiments of the disclosure. Specifically, Figure 3 (a) of FIG. 1 shows a radio protocol stack for a user plane for Uu communication, and Figure 3 (b) of FIG. 1 shows a radio protocol stack for a control plane for Uu communication. Figure 3 (c) of FIG. 1 shows a radio protocol stack for a user plane for SL communication, and Figure 3 (d) of FIG. 1 shows a radio protocol stack for a control plane for SL communication.

[0048] Referring to Figure 3The physical layer provides a service by using a physical channel to an upper layer. The physical layer is connected to a Medium Access Control (MAC) layer, which is an upper layer of the physical layer, through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified into Uplink Transport Channel and Downlink Transport Channel according to whether it is used for a transmission from the terminal to the network or for a transmission from the network to the terminal. The transport channel is further classified according to how data is transmitted over the radio interface and what characteristics of the data it transports.

[0049] Data is transferred through a physical channel between different physical layers (i.e., the PHY layer of the transmitter and the PHY layer of the receiver). The physical channel can be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

[0050] The MAC layer provides a service to a Radio Link Control (RLC) layer, which is an upper layer of the MAC layer, via a logical channel. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides a data transfer service through the logical channel.

[0051] The RLC layer performs concatenation, segmentation, and reassembly of a Radio Link Control Service Data Unit (RLC SDU). In order to ensure different Quality of Services (QoS) required by radio bearers (RBs), the RLC layer provides three types of operational mode, i.e., Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). The AM RLC provides error correction through an Automatic Repeat reQuest (ARQ).

[0052] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer is used for controlling the configuration, reconfiguration, and release of a logical channel, a transport channel, and a physical channel associated with a radio bearer (RB). The RB is a logical path provided by the first layer (i.e., the physical layer or PHY layer) and the second layer (i.e., the MAC layer, the RLC layer, the Packet Data Convergence Protocol (PDCP) layer, and the Service Data Adaptation Protocol (SDAP) layer) for data transmission between the terminal and the network.

[0053] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include the transfer of user data, header compression, and encryption. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include the transfer of control plane data and encryption / integrity protection.

[0054] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between a Quality of Service (QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) marking in both a DL packet and a UL packet.

[0055] The configuration of the RB implies a process for specifying a radio protocol layer and a channel property to provide a certain service and for determining a corresponding detailed parameter and operation method. The RB can then be classified into two types, i.e., a signaling radio bearer (SRB) and a data radio bearer (DRB). The SRB is used as a path for transmitting an RRC message in a control plane, and the DRB is used as a path for transmitting user data in a user plane.

[0056] When an RRC connection is established between an RRC layer of a UE and an RRC layer of an E-UTRAN, the UE is in an RRC connected (RRC_CONNECTED) state, and otherwise the UE can be in an RRC idle (RRC_IDLE) state. In the case of NR, an RRC inactive (RRC_INACTIVE) state is additionally defined, and a UE in the RRC_INACTIVE state can maintain a connection with a core network while releasing its connection with a BS.

[0057] A downlink transport channel for transmitting (or delivering) data from a network to a UE includes a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service can be transmitted via the downlink SCH or can be transmitted via a separate downlink multicast channel (MCH). In addition, an uplink transport channel for transmitting (or delivering) data from a UE to a network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

[0058] Examples of a logical channel belonging to a transport channel and mapped to a transport channel can include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), and the like.

[0059] Figure 4 The structure of a radio frame of the NR according to an embodiment of the present disclosure is shown. Figure 4 Embodiments of the present disclosure can be combined with various embodiments of the present disclosure.

[0060] Referring to Figure 4 In the NR, a radio frame can be used to perform uplink and downlink transmission. The length of the radio frame is 10 ms, and can be defined as consisting of two half frames (HF). The half frame can include five 1 ms subframes (SF). The subframe (SF) can be divided into one or more slots, and the number of slots within the subframe can be determined according to a subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP).

[0061] In case of using normal CP, each slot can include 14 symbols. In case of using extended CP, each slot can include 12 symbols. Herein, a symbol can include an OFDM symbol (or CP-OFDM symbol) and a single carrier-FDMA (SC-FDMA) symbol (or discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol).

[0062] Table 1 below represents the number of symbols per slot (N slot symb ), the number of slots per frame (N frame,u slot ), and the number of slots per subframe (N subframe,u slot ) according to an SCS setting (u) in case of using normal CP.

[0063] [Table 1]

[0064] SCS (15*2 u )]]>

[0010] N slot symb ]]> N frame,u slot ]]> N subframe,u slot ]]> 15 KHz (u = 0) 14 10 1 30 KHz (u = 1) 14 20 2 60 KHz (u = 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u = 4) 14 160 16

[0065] 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 an SCS in case of using extended CP.

[0066] [Table 2]

[0067] SCS (15*2 u )]]> N slot symb ]]> N frame,u slot ]] N subframe,u slot ]] 60 KHz (u = 2) 12 40 4

[0068] In the NR system, OFDM(A) numerologies (e.g., SCS, CP length, etc.) between a plurality of cells integrated into one UE can be configured differently. Accordingly, the (absolute time) duration (or interval) of a time resource (e.g., subframe, slot, or TTI) (collectively referred to as time unit (TU) for simplicity) composed of the same number of symbols can be configured differently in the integrated cells.

[0069] In the NR, a plurality of numerologies or SCSs for supporting various 5G services can be supported. For example, in case of an SCS of 15 kHz, a wide range of legacy cellular bands can be supported, and in case of an SCS of 30 kHz / 60 kHz, dense urban, lower latency, wider carrier bandwidths can be supported. In case of an SCS of 60 kHz or more, in order to overcome phase noise, a bandwidth greater than 24.25 GHz can be used.

[0070] The NR band can be defined as two different types of frequency ranges. The two different types of frequency ranges can be FR1 and FR2. Values of the frequency ranges can be changed (or varied), for example, the two different types of frequency ranges can be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean a'sub-6 GHz range', and FR2 can mean a 'higher than 6 GHz range', and can also be referred to as a millimeter wave (mmW).

[0071] [Table 3]

[0072] Frequency Range Designation Corresponding Frequency Range Subcarrier Spacing (SCS) FR1 450 MHz - 6000 MHz 15, 30, 60 kHz FR2 24250 MHz - 52600 MHz 60, 120, 240 kHz

[0073] As described above, values of the frequency ranges in the NR system can be changed (or varied). For example, as shown in Table 4 below, FR1 can include a bandwidth in a range of 410 MHz to 7125 MHz. More specifically, FR1 can include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and above. For example, the frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and above included in FR1 can include an unlicensed band. The unlicensed band can be used for various purposes, for example, the unlicensed band is used for vehicle-specific communication (e.g., autonomous driving).

[0074] [Table 4]

[0075] Frequency Range Designation Corresponding Frequency Range Subcarrier Spacing (SCS) FR1 410 MHz - 7125 MHz 15, 30, 60 kHz FR2 24250 MHz - 52600 MHz 60, 120, 240 kHz

[0076] Figure 5 A structure of a slot of an NR frame according to an embodiment of the disclosure is illustrated. Figure 5 Embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0077] Referring to FIG. 1, Figure 5 A slot includes a plurality of symbols in the time domain. For example, one slot can include 14 symbols in the case of a normal CP. For example, one slot can include 12 symbols in the case of an extended CP. Alternatively, one slot can include 7 symbols in the case of a normal CP. However, one slot can include 6 symbols in the case of an extended CP.

[0078] A carrier includes multiple subcarriers in a frequency domain. A resource block (RB) can be defined as multiple contiguous subcarriers (e.g., 12 subcarriers) in the frequency domain. A bandwidth part (BWP) can be defined as multiple contiguous (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via an activated BWP. Each element can be referred to as a resource element (RE) in a resource grid, and one complex symbol can be mapped to each element.

[0079] Hereinafter, a bandwidth part (BWP) and a carrier will be described in detail.

[0080] A BWP can be a contiguous set of physical resource blocks (PRBs) within a given numerology. The PRBs can be selected from a contiguous set of common resource blocks (CRBs) for a given numerology on a given carrier.

[0081] For example, a BWP can be at least any one of an active BWP, an initial BWP, and / or a default BWP. For example, a UE can not monitor downlink radio link quality in DL BWPs other than an activated DL BWP on a primary cell (PCell). For example, a UE can not receive PDCCH, physical downlink shared channel (PDSCH), or channel state information-reference signal (CSI-RS) (excluding RRM) other than an activated DL BWP. For example, a UE can not trigger channel state information (CSI) reporting for a non-activated DL BWP. For example, a UE can not transmit physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) other than an activated UL BWP. For example, in the case of downlink, an initial BWP can be given as a contiguous RB set for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by a physical broadcast channel (PBCH)). For example, in the case of uplink, an initial BWP can be given by a system information block (SIB) for a random access procedure. For example, a default BWP can be configured by a higher layer. For example, an initial value of a default BWP can be an initial DL BWP. For power saving, if a UE fails to detect downlink control information (DCI) during a specified period, the UE can switch an active BWP of the UE to a default BWP.

[0082] Further, a BWP can be defined for SL. The same SL BWP can be used in transmission and reception. For example, a transmitting UE can transmit a SL channel or a SL signal on a certain BWP, and a receiving UE can receive a SL channel or a SL signal on a certain BWP. In a licensed carrier, a SL BWP can be defined separately from a Uu BWP, and a SL BWP can have separate configuration signaling from a Uu BWP. For example, a UE can receive a configuration for a SL BWP from a BS / network. For example, a UE can receive a configuration for a Uu BWP from a BS / network. A SL BWP is (pre-)configured in a 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 a carrier.

[0083] Figure 6 An example of a BWP according to an embodiment of the disclosure is illustrated. Figure 6 Embodiments of the disclosure can be combined with various embodiments of the disclosure. It is assumed that in Figure 6 In embodiments of the disclosure, the number of BWPs is 3.

[0084] Referring to Figure 6 , a common resource block (CRB) can be a carrier resource block numbered from one end of a carrier frequency band to the other end thereof. In addition, a PRB can be a resource block numbered within each BWP. Point A can indicate a common reference point of a resource block grid.

[0085] A BWP can be configured by a point A, an offset (N start BWP ) from the point A, and a bandwidth (N size BWP ). For example, the point A can be an outer reference point of a PRB of a carrier, and subcarrier 0 of all numerologies (e.g., all numerologies supported by a network on a corresponding carrier) is aligned in the point A. For example, the offset can be a PRB distance between a lowest subcarrier within a given numerology and the point A. For example, the bandwidth can be the number of PRBs within a given numerology.

[0086] Hereinafter, V2X or SL communication will be described.

[0087] A sidelink synchronization signal (SLSS) can include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS) as SL-specific sequences. The PSSS can be referred to as a sidelink primary synchronization signal (S-PSS), and the SSSS can be referred to as a sidelink secondary synchronization signal (S-SSS). For example, a length-127 M-sequence can be used for the S-PSS, and a length-127 Gold sequence can be used for the S-SSS. For example, a UE can use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE can use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

[0088] A physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for transmitting default (system) information that a UE must first know before SL signal transmission / reception. For example, the default information can be information related to a SLSS, a duplex mode (DM), a time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to a resource pool, a type of application related to a SLSS, a subframe offset, broadcast information, etc. For example, in order to evaluate the PSBCH performance, a payload size of the PSBCH can be 56 bits including a cyclic redundancy check (CRC) of 24 bits in NR V2X.

[0089] The S-PSS, the S-SSS, and the PSBCH can be included in a block format (e.g., a SL synchronization signal (SS) / PSBCH block, hereinafter, a sidelink synchronization signal block (S-SSB)) supporting periodic transmission. The S-SSB can have the same numerology (i.e., SCS and CP length) as a physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in a carrier, and a transmission bandwidth can exist within a (pre-)configured sidelink (SL) BWP. For example, the S-SSB can have a bandwidth of 11 resource blocks (RBs). For example, the PSBCH can exist across 11 RBs. In addition, a frequency location of the S-SSB can be (pre-)configured. Accordingly, the UE does not have to perform hypothesis detection at a frequency to discover the S-SSB in a carrier.

[0090] Figure 7 A UE performing V2X or SL communication according to an embodiment of the disclosure is illustrated. Figure 7 Embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0091] Reference Figure 7In V2X or SL communication, the term "UE" can generally refer to a UE of a user. However, if a network device such as a BS transmits / receives a signal according to a communication scheme between UEs, the BS can also be regarded as a kind of UE. For example, UE 1 can be the first device 100, and UE 2 can be the second device 200.

[0092] For example, UE 1 can select a resource unit corresponding to a specific resource in a resource pool meaning a set of resource series. In addition, UE 1 can transmit an SL signal by using the resource unit. For example, the resource pool in which UE 1 is capable of transmitting a signal can be configured to UE 2 which is a receiving UE, and a signal of UE 1 can be detected in the resource pool.

[0093] Herein, if UE 1 is within a connection range of a BS, the BS can inform UE 1 of a resource pool. Otherwise, if UE 1 is outside the connection range of the BS, another UE can inform UE 1 of a resource pool, or UE 1 can use a pre-configured resource pool.

[0094] Generally, a resource pool can be configured in units of a plurality of resources, and each UE can select a unit of one or more resources to use it in its SL signal transmission.

[0095] Hereinafter, resource allocation in SL will be described.

[0096] Figure 8 A procedure of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the disclosure is illustrated. Figure 8 Embodiments of the disclosure can be combined with various embodiments of the disclosure. In various embodiments of the disclosure, a transmission mode can be referred to as a mode or a resource allocation mode. Hereinafter, for convenience of explanation, in LTE, a transmission mode can be referred to as an LTE transmission mode. In NR, a transmission mode can be referred to as an NR resource allocation mode.

[0097] For example, Figure 8 (a) of FIG. 1 illustrates UE operation related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 8 (a) of FIG. 1 illustrates UE operation related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example,

[0098] For example, Figure 8 (b) of FIG. 1 illustrates UE operation related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 (b) of FIG. 1 illustrates UE operation related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example,

[0099] Referring to Figure 8 (a) in FIG. 1, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, a BS can schedule SL resources to be used for SL transmission by a UE. For example, the BS can perform resource scheduling on UE 1 by PDCCH (e.g., downlink control information (DCI)) or RRC signaling (e.g., configured grant type 1 or configured grant type 2), and UE 1 can perform V2X or SL communication for UE 2 according to the resource scheduling. For example, UE 1 can 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).

[0100] Referring to Figure 8 (b) in FIG. 1, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, a UE can determine SL transmission resources within SL resources configured by a BS / network or pre-configured SL resources. For example, the configured SL resources or pre-configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources in a configured resource pool. For example, the UE can autonomously select resources within a selection window by performing sensing and resource (re)selection procedures. For example, sensing can be performed in units of sub-channels. In addition, UE 1 that has autonomously selected resources in a resource pool can transmit SCI to UE 2 through a PSCCH, and thereafter can transmit data based on the SCI to UE 2 through a PSSCH.

[0101] Figure 9 Three types of broadcast are shown in accordance with embodiments of the present disclosure. Figure 9 Embodiments of FIG. 1 can be combined with various embodiments of the present disclosure. Specifically, Figure 9 (a) in FIG. 1 shows broadcast-type SL communication, Figure 9 (b) in FIG. 1 shows unicast-type SL communication, and Figure 9 (c) in FIG. 1 shows groupcast-type SL communication. In the case of unicast-type SL communication, a UE can perform one-to-one communication for another UE. In the case of groupcast-type SL transmission, a UE can perform SL communication for one or more UEs in a 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.

[0102] Hereinafter, sidelink (SL) congestion control will be described.

[0103] If the UE autonomously determines the SL transmission resource, the UE also autonomously determines the size of the resource for the UE to use and the frequency of use. Of course, due to constraints from the network or the like, the use of a resource size greater than or equal to a certain level or the frequency of use can be limited. However, if all UEs use a relatively large amount of resources in a situation in which many UEs are concentrated in a certain area at a certain time, the overall performance can be significantly degraded due to mutual interference.

[0104] Therefore, the UE can need to observe the channel situation. If it is determined that an excessive amount of resources is consumed, it is preferable for the UE to 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 a unit time / frequency resource is greater than or equal to a certain level, and can adjust the amount and frequency of use of its transmission resource based on the ratio of the unit time / frequency resource in which the energy greater than or equal to a certain level is observed. In the present disclosure, the ratio of the time / frequency resource in which the energy greater than or equal to a certain level is observed can be defined as a channel busy ratio (CBR). The UE can measure the CBR of the channel / frequency. In addition, the UE can transmit the measured CBR to the network / BS.

[0105] Figure 10 A resource unit for CBR measurement based on an embodiment of the present disclosure is shown. Figure 10 Embodiments of the present disclosure can be combined with various embodiments of the present disclosure.

[0106] Referring to Figure 10 As a result of the UE measuring the RSSI based on the subchannel for a certain period (e.g., 100 ms), the CBR can represent the number of subchannels in which the measured value of the received signal strength indicator (RSSI) has a value greater than or equal to a preconfigured threshold. Alternatively, the CBR can represent the ratio of subchannels having a value greater than or equal to a preconfigured threshold among subchannels for a certain duration. For example, in an embodiment of the present disclosure, if it is assumed that a shaded subchannel is a subchannel having a value greater than or equal to a preconfigured threshold, the CBR can represent the ratio of shaded subchannels for 100 ms. In addition, the CBR can be reported to the BS. Figure 10

[0107] ​In addition, congestion control considering the priority of traffic (e.g., packet) can be necessary. To this end, for example, the UE can measure a channel occupancy ratio (CR). Specifically, the UE can measure a CBR, and the UE can determine a maximum value of a channel occupancy ratio k (CRk) that can be occupied by traffic corresponding to each priority (e.g., k) based on the CBR. For example, the UE can derive the maximum value of the channel occupancy ratio CRlimitk related to the priority of each traffic based on a predetermined table of CBR measurement values. For example, in the case of traffic having a relatively high priority, the UE can derive a relatively large maximum value of the channel occupancy ratio. Thereafter, the UE can perform congestion control by limiting the sum of the channel occupancy ratios of traffic whose priority k is lower than i to a value smaller than or equal to a certain value. Based on this method, for traffic having a relatively low priority, the channel occupancy ratio can be more strictly limited.

[0108] In addition to this, the UE can perform SL congestion control by using adjusting a transmission power level, discarding a packet, determining whether to perform retransmission, adjusting a transmission RB size (MCS coordination), etc.

[0109] Hereinafter, a hybrid automatic repeat request (HARQ) procedure will be described.

[0110] In the case of SL unicast and SL groupcast, HARQ feedback and HARQ combining in the physical layer can be supported. For example, in the case where a receiving UE operates in resource allocation mode 1 or 2, the receiving UE can receive a PSSCH from a transmitting UE, and the receiving UE can transmit HARQ feedback corresponding to the PSSCH to the transmitting UE using a sidelink feedback control information (SFCI) format through a physical sidelink feedback channel (PSFCH).

[0111] For example, SL HARQ feedback can be enabled for unicast. In this case, in a non-code block group (non-CBG), the receiving UE can decode a PSCCH targeted for the receiving UE, and when the receiving UE successfully decodes a transport block related to the PSCCH, the receiving UE can generate a HARQ-ACK. Thereafter, the receiving UE can transmit the HARQ-ACK to the transmitting UE. In contrast, after the receiving UE decodes the PSCCH targeted for the receiving UE, if the receiving UE fails to successfully decode the transport block related to the PSCCH, the receiving UE can generate a HARQ-NACK, and the receiving UE can transmit the HARQ-NACK to the transmitting UE.

[0112] For example, SL HARQ feedback can be enabled for groupcast. For example, during a non-CBG, two different types of HARQ feedback options can be supported for groupcast.

[0113] (1) Multicast Option 1: After decoding the PSCCH targeting the receiving UE, if the receiving UE fails to decode the transport block related to the PSCCH, the receiving UE can send a HARQ-NACK to the transmitting UE via PSFCH. In contrast, when the receiving UE decodes the PSCCH targeting the receiving UE, and when the receiving UE successfully decodes the transport block related to the PSCCH, the receiving UE does not send a HARQ-ACK to the transmitting UE.

[0114] (2) Multicast Option 2: After decoding the PSCCH targeting the receiving UE, if the receiving UE fails to decode the transport block related to the PSCCH, the receiving UE can send a HARQ-NACK to the transmitting UE via PSFCH. Also, when the receiving UE decodes the PSCCH targeting the receiving UE, and when the receiving UE successfully decodes the transport block related to the PSCCH, the receiving UE can send a HARQ-ACK to the transmitting UE via PSFCH.

[0115] 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 transmit HARQ feedback by using the same PSFCH resources.

[0116] 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 transmit HARQ feedback by using different PSFCH resources.

[0117] For example, when SL HARQ feedback is enabled for multicast, a receiving UE can determine whether to send HARQ feedback to a transmitting UE based on a transmit-receive (TX-RX) distance and / or a reference signal received power (RSRP).

[0118] For example, in the case of TX-RX distance based HARQ feedback in the groupcast option 1, if the TX-RX distance is less than or equal to the communication range requirement, the receiving UE can transmit the 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 can not transmit the HARQ feedback in response to the PSSCH to the transmitting UE. For example, the transmitting UE can inform the receiving UE of the location of the transmitting UE through the SCI related to the PSSCH. For example, the SCI related to the PSSCH can be the second SCI. For example, the receiving UE can 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 can decode the SCI related to the PSSCH, and thus can know the communication range requirement for the PSSCH.

[0119] For example, in the case of the resource allocation mode 1, the time (offset) between the PSFCH and the PSSCH can be configured or pre-configured. In the case of unicast and groupcast, if retransmission must be made on the SL, it can be indicated by the UE in the coverage of the PUCCH to the BS. The transmitting UE can transmit the indication to the serving BS of the transmitting UE in the form of scheduling request (SR) / buffer status report (BSR) rather than in the form of HARQ ACK / NACK. In addition, even if the BS does not receive the indication, the BS can schedule the SL retransmission resource for the UE. For example, in the case of the resource allocation mode 2, the time (offset) between the PSFCH and the PSSCH can be configured or pre-configured.

[0120] For example, from the perspective of the UE transmitting in the carrier, for the PSFCH format for the SL in the 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. Herein, the single symbol can not be the AGC duration. For example, the sequence based PSFCH format can be applied to unicast and groupcast.

[0121] For example, in the slot related to the resource pool, the PSFCH resource can be periodically configured as N slot durations, or can be pre-configured. For example, N can be configured as one or more values greater than or equal to 1. For example, N can be 1, 2, or 4. For example, the HARQ feedback for the transmission in a specific resource pool can be transmitted through the PSFCH only on the specific resource pool.

[0122] For example, if a transmitting UE transmits a PSSCH to a receiving UE across slots #x to #n, the receiving UE can transmit HARQ feedback in response to the PSSCH to the transmitting UE in slot #(N+A). For example, slot #(N+A) can include a PSFCH resource. Herein, for example, A can be a minimum integer greater than or equal to K. For example, K can be a number of logical slots. In this case, K can be a number of slots in a resource pool. Alternatively, for example, K can be a number of physical slots. In this case, K can be a number of slots inside or outside a resource pool.

[0123] For example, if a receiving UE transmits HARQ feedback on a PSFCH resource in response to one PSSCH transmitted by a transmitting UE to the receiving UE, the receiving UE can determine a frequency domain and / or code domain of the PSFCH resource based on an implicit mechanism in a configured resource pool. For example, the receiving UE can determine the frequency domain and / or code domain of the PSFCH resource based on at least one of a slot index related to the PSCCH / PSSCH / PSFCH, a subchannel related to the PSCCH / PSSCH, or an identifier for identifying each receiving UE in a group based on groupcast option 2. Additionally / alternatively, for example, the receiving UE can determine the frequency domain and / or code domain of the PSFCH resource based on at least one of a SL RSRP, a SINR, a L1 source ID, and / or location information.

[0124] For example, if a HARQ feedback transmission by a UE through a PSFCH overlaps with a HARQ feedback reception through a PSFCH, the UE can select either one of the HARQ feedback transmission through the PSFCH and the HARQ feedback reception through the PSFCH based on a priority rule. For example, the priority rule can be based on at least a priority indication of a related PSCCH / PSSCH.

[0125] For example, if HARQ feedback transmissions by a UE through a PSFCH overlap for multiple UEs, the UE can select a specific HARQ feedback transmission based on a priority rule. For example, the priority rule can be based on a lowest priority indication of a related PSCCH / PSSCH.

[0126] Hereinafter, sidelink control information (SCI) will be described.

[0127] Control information transmitted by a BS to a UE through a PDCCH can be referred to as downlink control information (DCI), and control information transmitted by a UE to another UE through a PSCCH can be referred to as SCI. For example, a UE can know a starting symbol of a PSCCH and / or a number of symbols of the PSCCH in advance before decoding the PSCCH. For example, SCI can include SL scheduling information. For example, a UE can transmit at least one SCI to another UE to schedule a PSSCH. For example, one or more SCI formats can be defined.

[0128] For example, a transmitting UE can transmit a SCI to a receiving UE on a PSCCH. The receiving UE can decode one SCI to receive a PSSCH from the transmitting UE.

[0129] For example, a transmitting UE can transmit two consecutive SCIs (e.g., 2-stage SCI) to a receiving UE on a PSCCH and / or a PSSCH. The receiving UE can decode the two consecutive SCIs (e.g., 2-stage SCI) to receive a PSSCH from the transmitting UE. For example, if SCI configuration fields are divided into two groups in consideration of a (relatively) high SCI payload size, a SCI including a first SCI configuration field group can be referred to as a first SCI or a first SCI, and a SCI including a second SCI configuration field group can be referred to as a second SCI or a second SCI. For example, a transmitting UE can transmit a first SCI to a receiving UE through a PSCCH. For example, a transmitting UE can transmit a second SCI to a receiving UE on a PSCCH and / or a PSSCH. For example, the second SCI can be transmitted to the receiving UE through an (independent) PSCCH or can be transmitted in a piggyback manner with data through a PSSCH. For example, the two consecutive SCIs can also be applied to different transmissions (e.g., unicast, broadcast, or groupcast).

[0130] For example, a transmitting UE can transmit all or part of information described below to a receiving UE through a SCI. Herein, for example, a transmitting UE can transmit all or part of information described below to a receiving UE through a first SCI and / or a second SCI.

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

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

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

[0134] - Modulation coding scheme (MCS) information, and / or

[0135] - Transmission power information, and / or

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

[0137] - SL HARQ process ID information, and / or

[0138] - New data indicator (NDI) information, and / or

[0139] - Redundancy version (RV) information, and / or

[0140] - QoS information related to (transmitted traffic / packets), e.g., priority information, and / or

[0141] - SL CSI-RS transmission indicator or information on the number of SL CSI-RS antenna ports (to be transmitted)

[0142] - Transmission UE’s location information or target receiving UE’s location (or distance area) information (for which SL HARQ feedback is requested), and / or

[0143] - Reference signal (e.g., DMRS, etc.) related to channel estimation and / or decoding of data to be transmitted over PSSCH, e.g., information related to the pattern of (time-frequency) mapping resources of DMRS, rank information, antenna port index information.

[0144] For example, the first SCI can include information related to channel sensing. For example, the receiving UE can decode the second SCI by using the PSSCH DMRS. The polar code used in PDCCH can be applied to the second SCI. For example, in the resource pool, the payload size of the first SCI can be equal for unicast, groupcast, and broadcast. After decoding the first SCI, the receiving UE does not have to perform blind decoding on the second SCI. For example, the first SCI can include scheduling information of the second SCI.

[0145] Also, in various embodiments of the disclosure, since the transmitting UE can transmit at least one of the SCI, the first SCI, and / or the second SCI to the receiving UE through the PSCCH, the PSCCH can be replaced / replaced by at least one of the SCI, the first SCI, and / or the second SCI. Additionally / alternatively, for example, the SCI can be replaced / replaced by at least one of the PSCCH, the first SCI, or the second SCI. Additionally / alternatively, for example, since the transmitting UE can transmit the second SCI to the receiving UE through the PSSCH, the PSSCH can be replaced / replaced by the second SCI.

[0146] In the disclosure, the term "configured or configuring" or "defined or defining" can be interpreted as (pre-)configured by a base station or a network (through predefined signaling (e.g., SIB, MAC signaling, RRC signaling)). For example, "A can be configured" can include "a base station or a network (pre-)configures or defines or informs A to a UE". Alternatively, the term "configured or configuring" or "defined or defining" can be interpreted as being pre-configured or pre-defined in a system. For example, "A can be configured" can include "A is pre-configured or pre-defined in a system".

[0147] In the disclosure, for example, a resource block (RB) can be replaced / replaced by a subcarrier. Also, for example, in the disclosure, a packet or traffic can be replaced / replaced by a transport block (TB) or a medium access control protocol data unit (PDU) according to a transmission layer.

[0148] In the disclosure, for example, a source ID can be replaced / replaced by a destination ID.

[0149] In the disclosure, for example, an L1 ID can be replaced / replaced by an L2 ID. For example, the L1 ID can be an L1 source ID or an L1 destination ID. For example, the L2 ID can be an L2 source ID or an L2 destination ID.

[0150] Meanwhile, the base station can allocate resources (hereinafter, SL resources) for transmitting and receiving the SL channel / signal to the UE. For example, the base station can transmit information related to the resources to the UE. In the disclosure, a method in which the base station allocates the SL resources to the UE can be referred to as a mode 1 method, a mode 1 operation, or a resource allocation mode 1.

[0151] On the other hand, the UE can select a SL resource within a resource pool based on sensing. In the disclosure, a method for selecting a SL resource by a UE can be referred to as a mode 2 method, a mode 2 operation, or a resource allocation mode 2. For example, in the resource allocation mode 2, the UE can detect SCI transmitted by other UEs, and the UE can identify resources reserved by other UEs based on the SCI, and the UE can obtain RSRP measurement values. In addition, based on the above sensing results, the UE can exclude specific resources within a resource selection window to select resources for SL transmission. In the case of a sensing operation, the UE can refer to resource allocation information received through the first SCI. However, due to the overhead of the first SCI, the amount of information that can be obtained by the UE in the first SCI can be limited.

[0152] Based on various embodiments of the disclosure, in order to assist the sensing operation and / or the resource selection operation of the first UE, the second UE can transmit additional assistance information. The first UE can use the assistance information received from the second UE in order to improve PSSCH detection performance and / or reduce half-duplex limitations and / or select a backup resource for transmission and reception of a specific signal. In embodiments of the disclosure, for ease of description, it is assumed that UE-A transmits assistance information to UE-B. It is assumed that UE-B selects resources for PSCCH / PSSCH to be transmitted to UE-A and / or resources for PSCCH / PSSCH to be transmitted to UE-C (i.e., a third UE) based on the assistance information received from UE-A.

[0153] Figure 11 A procedure for UE-A to transmit assistance information to UE-B based on embodiments of the disclosure is shown. Figure 11 Embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0154] Referring to Figure 11 In step S1100, UE-A can transmit assistance information to UE-B. For example, UE-B can select resources for PSCCH / PSSCH to be transmitted to UE-A based on the assistance information received from UE-A, and UE-B can perform SL transmission by using the resources. For example, UE-B can select resources for PSCCH / PSSCH to be transmitted to UE-C based on the assistance information received from UE-A, and UE-B can perform SL transmission by using the resources. In the disclosure, the assistance information can be referred to as additional information.

[0155] Based on embodiments of the present disclosure, information related to the reserved resource to be informed by the UE-A to the UE-B can be extended. For example, in addition to the information related to the resource included in the SCI, the assistance information can include information related to additional resources. For example, the information related to the resource included in the assistance information can be information related to the extended reserved resource. Specifically, for example, in addition to the information related to the reserved resource (e.g., up to three resources) transmitted through the SCI, the UE-A can transmit information related to other reserved resources (e.g., information related to the frequency domain resource and / or information related to the time domain resource) to the UE-B through the assistance information. In this case, for the additionally indicated reserved resource, the UE-B can determine whether to exclude the resource corresponding to the reserved resource within the resource selection window. For example, the reserved resource can be indicated in the form of a plurality of groups. For example, each of the plurality of reserved resource groups can be indicated by the first SCI and / or indicated by the second SCI and / or indicated by the PSSCH (within the data). For example, a priority value can be additionally configured / indicated for each reserved resource group. For example, an RSRP measurement value can be additionally configured / indicated for each reserved resource group. For example, an RSRP threshold value (for combination of priority) can be additionally configured / indicated for each reserved resource group. For example, a specific level value can be additionally configured / indicated for each reserved resource group. For example, when (re)selecting a resource, the UE-B can differently process the indicated reserved resource for each specific level value. For example, for a reserved resource group having a specific level, even if the RSRP measurement value is greater than (or equal to or greater than) the RSRP threshold value, the UE-B can not exclude the reserved resource group having the specific level from the set of resources selectable for transmission. For example, the extended reserved resource can be used for the same TB. For example, the extended reserved resource can be used for multiple TBs. For example, if the extended reserved resource is used for multiple TBs, the indication unit of the extended reserved resource can be per TB unit. For example, the UE-A can select the extended reserved resource based on at least one of the number of retransmissions, whether it is a retransmission, a packet size, priority information, and / or information related to the TB from a higher layer (e.g., a MAC layer) through the resource (re)selection procedure. Here, the UE-A can perform a sensing operation, and when the UE-A performs the resource (re)selection procedure or (re)selects a resource for each resource group, the size of the corresponding window and / or the number of resources can be extended. For example, the size of the window can be configured or pre-configured for the UE. For example, whether the size of the window is extended can be configured or pre-configured for the UE. For example, the (maximum) number of resources can be configured or pre-configured for the UE. For example, whether the (maximum) number of resources is extended can be configured or pre-configured for the UE.

[0156] Based on embodiments of the disclosure, the UE-A can transmit, to the UE-B, information related to time domain resources through which the UE-A cannot perform SL reception and / or information related to time domain resources through which the UE-A can perform SL reception. For example, the UE-A can transmit, to the UE-B, information related to frequency domain resources through which the UE-A cannot perform SL reception and / or information related to frequency domain resources through which the UE-A can perform SL reception. For example, the assistance information can include information related to time domain resources through which the UE-A cannot perform SL reception and / or information related to time domain resources through which the UE-A can perform SL reception. For example, the assistance information can include information related to frequency domain resources through which the UE-A cannot perform SL reception and / or information related to frequency domain resources through which the UE-A can perform SL reception. For example, the UE-A can transmit, to the UE-B, information related to time domain resources and / or information related to frequency domain resources in which the UE-A can have low reception performance. For example, the UE-A can transmit, to the UE-B, information related to time domain resources and / or information related to frequency domain resources in which the UE-A can have high reception performance. For example, the low reception performance can refer to a target error probability greater than or equal to a certain threshold. For example, the high reception performance can refer to a target error probability less than or equal to a certain threshold. For example, the low reception performance can refer to a target SINR and / or a target SNR less than or equal to a certain threshold. For example, the high reception performance can refer to a target SINR and / or a target SNR greater than or equal to a certain threshold. For example, the low reception performance can refer to a target interference level greater than or equal to a certain threshold. For example, the high reception performance can refer to a target interference level less than or equal to a certain threshold. That is, if the UE-A intends to receive PSCCH / PSSCH from the UE-B, the UE-A can transmit, to the UE-B, information related to preferred resources and / or information related to non-preferred resources. In this case, the UE-B can transmit PSCCH / PSSCH to a group of UEs including at least the UE-A by using resources other than the non-preferred resources. For example, the UE-B can transmit PSCCH / PSSCH to a group of UEs including at least the UE-A by preferentially using the preferred resources. For example, the UE-A can determine / configure a domain in which reception is not possible and / or a domain in which reception is possible based on a time when SL transmission is scheduled and / or a time when UL transmission is scheduled and / or a time when DL reception is scheduled. For example, the UL transmission and / or the DL reception can be limited to transmission / reception satisfying a certain condition (e.g., URLLC (e.g., corresponding to a priority index 1)). For example, the UL transmission and / or the DL reception can be limited to transmission / reception corresponding to system information and / or paging and / or random access (e.g., PRACH and / or MsgA and / or Msg3 and / or random access response and / or MsgB).

[0157] For example, the UL transmission and / or DL reception can correspond to a periodic transmission (e.g., a periodic CSI report, a configured grant (CG) PUSCH, a semi-persistent scheduling (SPS) PDSCH, etc.). For example, the UE-A can include, in the additional information, information on the SL transmission resource corresponding to the periodic transmission or the timing of the SL transmission resource. For example, the UE-A can transmit the additional information again if a resource reselection counter for the periodic SL transmission expires (e.g., if the resource reselection counter reaches zero). For example, the UE-A can transmit the additional information again if the UE-A triggers resource (re)selection for all or part of the resources for the periodic transmission. For example, the UE-A can transmit the additional information again if a change occurs in the periodic SL transmission resource. For example, the UE-A can trigger and / or perform transmission of the additional information if information on the periodic UL transmission and / or DL reception of the UE-A changes. For example, the UE-A can trigger and / or perform transmission of the additional information if an active DL BWP changes and / or an active UL BWP changes. This is because a configuration for the periodic UL transmission can change due to a change in the active BWP. For example, the UE-A can trigger and / or perform transmission of the additional information if the UE-A receives a DCI corresponding to a CG resource. For example, the DCI can be a DCI for activating and / or deactivating the CG resource. For example, a retransmission DCI for the CG resource can be excluded from the DCI. For example, the UE-A can trigger and / or perform transmission of the additional information if the UE-A receives a DCI for activating and / or deactivating the CG resource. On the other hand, for example, the UE-A can not trigger and / or perform transmission of the additional information if the UE-A receives a retransmission DCI for the CG resource.

[0158] For example, the UE-A can determine / configure the corresponding resource according to whether the RSRP measurement value for each resource (e.g., a slot, a subchannel, a group of slots, and / or a group of subchannels) is higher than a certain threshold value through a sensing operation. For example, the certain threshold value can be (pre-)configured, pre-defined, or selected by a UE implementation. For example, the UE-A can determine / configure the corresponding resource based on the SINR estimation value and / or the RSSI measurement value for each resource (e.g., a slot, a subchannel, a group of slots, and / or a group of subchannels).

[0159] Based on embodiments of the disclosure, UE-A can transmit all or part of the information about the sensing operation performed by UE-A to UE-B. For example, the assistance information can include information obtained by UE-A based on the sensing operation. For example, the information about the sensing operation can include at least one of the following: information related to an RSRP measurement value, a HARQ process number, an L1 destination ID, an L1 source ID, priority information (e.g., RX priority), and / or information related to the reserved resource (e.g., time resource indication value (TRIV), frequency resource indication value (FRIV), resource reservation period) indicated by the first SCI and / or the second SCI and / or the PSSCH detected by UE-A.

[0160] For example, the RSRP measurement value can be an infinite value or a value corresponding to an infinite value. In this case, for example, UE-B can exclude the resource corresponding to the RSRP measurement value (e.g., an infinite value or a value corresponding to an infinite value) from the set of available resources. For example, UE-B can exclude a transmission pattern overlapping the resource corresponding to the RSRP measurement value (e.g., an infinite value or a value corresponding to an infinite value) from the set of available resources.

[0161] For example, the RSRP measurement value corresponding to a specific value can indicate that UE-B directly measures the RSRP value based on the RS on the PSSCH corresponding to the transmission of the assistance information. Specifically, for example, if UE-A transmits assistance information including an RSRP measurement value having a specific value to UE-B through a PSSCH, UE-B can measure the RSRP based on the RS on the PSSCH.

[0162] For example, the UE-A can include and transmit, in the additional information, information on a time at which the first SCI and / or the second SCI and / or the PSSCH transmitted by the other UE is detected (e.g., information on a slot or information on a time period). For example, the additional information can include at least one of the following information: information related to a transmission priority, information related to a transmission resource reservation period, information related to a transmission resource reselection counter, and / or information related to a number of sub-channels used for the PSSCH transmission. For example, the additional information can include an RSSI measurement value for each sub-channel or sub-channel group within a certain time period. Specifically, for example, the UE-A can perform an RSSI measurement in units of sub-channels or sub-channel groups during a certain time period, and the UE-A can transmit, to the UE-B, the additional information including the RSSI measurement value for each sub-channel or sub-channel group. In this case, for example, the UE-A can repeatedly measure the RSSI value of each sub-channel or sub-channel group during a (pre-)configured or predefined time period, and the UE-A can obtain / calculate an average value of the RSSI measurement value. For example, the number of sub-channels included in the sub-channel group can be (pre-)configured to the UE. For example, the base station / network can transmit, to the UE, information related to the number of sub-channels included in the sub-channel group.

[0163] For example, the information on the sensing operation can include at least one of the following information: information on a resource selection window of the UE-A, information on a reference resource selection window for the additional information, and / or information on resources (all or part of which) excluded from the resource selection target based on sensing within the resource selection window. For example, the UE can determine the resource indicated in the additional information based on a certain MCS table and / or a certain block error rate (BLER) requirement and / or a certain modulation order value and / or a certain coding rate value and / or a certain coding rate value range. In this case, for example, the receiving UE can adjust the additional information based on the certain MCS table and / or the certain BLER requirement and / or the certain modulation order value and / or the certain coding rate value and / or the certain coding rate value range to be referred to and the actual value to be used. For example, the certain MCS table and / or the certain BLER requirement and / or the certain modulation order value and / or the certain coding rate value and / or the certain coding rate value range corresponding to the additional information can be (pre-)configured to the UE. For example, the certain MCS table and / or the certain BLER requirement and / or the certain modulation order value and / or the certain coding rate value and / or the certain coding rate value range corresponding to the additional information can be included in the additional information together with the additional information, for each resource pool and / or for each resource indicator group.

[0164] For example, the additional information can comprise resource information related to all remaining resources excluded from the resource selection target within the resource selection window. For example, the additional information can comprise resource information related to a part of the remaining resources excluded from the resource selection target within the resource selection window. For example, the resource selection window can comprise a start time and an end time. For example, the end time of the resource selection window can be given in the form of a time interval (e.g., time offset or slot offset) relative to the start time of the resource selection window. For example, the form of the start time of the resource selection window can be SFN or DFN and a slot offset relative to the indicated SFN or DFN. For example, the start time of the resource selection window can be a time after the slot offset from a particular SFN or a particular DFN. For example, the slot offset can be a slot offset for a physical slot. For example, the slot offset can be a slot offset for a slot in which a time interval between the SL starting symbol and the SL symbol length comprises a cell-specific UL resource. For example, the slot offset can be a slot offset for a slot which is a target of a resource pool configuration. For example, the slot offset can be a slot offset for a logical resource within a resource pool. For example, to reduce the overhead for indicating SFN or DFN values, the SFN or DFN value range corresponding to the location information of the reference resource selection window can be limited to a part of all possible SFN or DFN values. For example, the starting location of the reference resource selection window corresponding to the additional information can be limited to a particular SFN or a particular DFN. For example, the particular SFN or the particular DFN can be an SFN or a DFN with an even index value. For example, the particular SFN or the particular DFN can be an SFN or a DFN with an odd index value. For example, the UE can be configured or pre-configured with index values of SFNs or DFNs which can be designated / configured as the particular SFN or the particular DFN. For example, to reduce the overhead for indicating SFN or DFN values, the location information of the reference resource selection window can be transmitted by the additional information in the form of an index of the SFN or the DFN in which the additional information is transmitted and a radio frame offset value relative to the index. For example, the UE can be configured or pre-configured with a maximum value of the radio frame offset for each resource pool. For example, the UE can be configured or pre-configured with a maximum value of the radio frame offset for each service type. For example, the UE can be configured or pre-configured with a maximum value of the radio frame offset for each congestion control level range. For example, the UE can be configured or pre-configured with a maximum value of the radio frame offset for each QoS parameter. For example, the UE can be configured or pre-configured with a maximum value of the radio frame offset for each reference priority. For example, the maximum value can be configured to be equal to or less than the available time corresponding to the additional information. For example, based on the radio frame offset value, the UE can determine that the reference resource selection window starts in or is located in the same frame as the radio frame in which the additional information is received.For example, based on the radio frame offset value, the UE can determine that the reference resource selection window starts at or is located in a frame positioned a number of frames after the radio frame in which the additional information is received. For example, the starting slot position information of the reference resource selection window can be transmitted in the form of an index of a slot in which the additional information is transmitted and a slot offset value relative to the index, by the additional information. For example, a maximum value of the slot offset can be configured or pre-configured to the UE per resource pool. For example, a maximum value of the slot offset can be configured or pre-configured to the UE per service type. For example, a maximum value of the slot offset can be configured or pre-configured to the UE per congestion control level range. For example, a maximum value of the slot offset can be configured or pre-configured to the UE per QoS parameter. For example, a maximum value of the slot offset can be configured or pre-configured to the UE per reference priority. For example, the maximum value can be configured to be equal to or less than the available time corresponding to the additional information.

[0165] For example, the UE-A can include, in the additional information, information related to a starting time of a reference resource selection window used by the UE-A to generate the additional information, and transmit the additional information to the UE-B. That is, the UE-A can transmit, to the UE-B, the additional information including the information related to the starting time of the reference resource selection window used to generate the additional information. Alternatively, the information related to the starting time of the reference resource selection window used by the UE-A to generate the additional information can be transmitted separately from the additional information, for example. For example, the UE-A can transmit, to the UE-B, a first SCI including the information related to the starting time of the reference resource selection window used to generate the additional information. For example, the UE-A can transmit, to the UE-B, a second SCI including the information related to the starting time of the reference resource selection window used to generate the additional information. In this case, for example, the UE-B can obtain the information related to the reference resource selection window to be assumed in interpreting the additional information based on the first SCI or the second SCI. For example, the information related to an ending time of the reference resource selection window used by the UE-A to generate the additional information can be transmitted through the additional information. For example, the information related to a size of the reference resource selection window used by the UE-A to generate the additional information can be transmitted through the additional information. For example, the UE can be configured or pre-configured with the ending time of the reference resource selection window to be used to generate the additional information differently or independently for each resource pool. For example, the UE can be configured or pre-configured with the ending time of the reference resource selection window to be used to generate the additional information differently or independently for each reference transmission priority. For example, the UE can be configured or pre-configured with the ending time of the reference resource selection window to be used to generate the additional information differently or independently for each reference QoS parameter. For example, the UE can be configured or pre-configured with the ending time of the reference resource selection window to be used to generate the additional information differently or independently for each reference service type. For example, the UE can be configured or pre-configured with the size of the reference resource selection window to be used to generate the additional information differently or independently for each resource pool. For example, the UE can be configured or pre-configured with the size of the reference resource selection window to be used to generate the additional information differently or independently for each reference transmission priority. For example, the UE can be configured or pre-configured with the size of the reference resource selection window to be used to generate the additional information differently or independently for each reference QoS parameter. For example, the UE can be configured or pre-configured with the size of the reference resource selection window to be used to generate the additional information differently or independently for each reference service type.

[0166] For example, UE-A can transmit information related to the initial transmission time of the supplementary information via at least one of the first SCI, the second SCI, and / or the PSSCH. For example, UE-A can transmit information related to the initial transmission time of the supplementary information via the first SCI. For example, UE-A can transmit information related to the initial transmission time of the supplementary information via the second SCI. For example, UE-A can transmit information related to the initial transmission time of the supplementary information via the PSSCH. For example, if UE-A transmits information related to the initial transmission time of the supplementary information, then UE-B (e.g., a UE that has received the supplementary information) can specify the resource indicated in the supplementary information based on the information related to the initial transmission time of the supplementary information obtained via at least one of the first SCI, the second SCI, and / or the PSSCH, and UE-B can perform resource (re)selection based on the information related to that resource.

[0167] For example, UE-A may include information related to all or part of the available resources and / or excluded resources in the resource selection window in the additional information. For example, the additional information may include at least one of the following: information related to transmission priority, information related to transmission resource reservation period, information related to transmission resource reselection counter, and / or information related to the number of sub-channels used for PSSCH transmission. For example, the information may correspond to transmission packets of UE-A. For example, at least one of the following information to be used to generate the additional information may be configured or pre-configured to the UE: information related to transmission priority, information related to transmission resource reservation period, information related to transmission resource reselection counter, and / or information related to the number of sub-channels used for PSSCH transmission. For example, the default value for the number of sub-channels used by UE-A to generate the additional information for PSSCH transmission may be 1. For example, the default value for the transmission resource reservation period used by UE-A to generate the additional information may be the minimum value among the resource reservation periods configured for the resource pool used by UE-A to transmit the additional information. For example, the default value for the resource retention period used by UE-A to generate additional information could be the maximum value among the resource retention periods configured for the resource pool used by UE-A to generate additional information. For example, the default value for the resource retention period used by UE-A to generate additional information could be the average value among the resource retention periods configured for the resource pool used by UE-A to generate additional information. For example, the default value for the resource retention period used by UE-A to generate additional information could be the median value among the resource retention periods configured for the resource pool used by UE-A to generate additional information. For example, the default value for the resource retention period used by UE-A to generate additional information could be the minimum value among the resource retention periods configured for the resource pool used by UE-A to generate additional information that are greater than or equal to 100 milliseconds. For example, the default value for the resource retention period used by UE-A to generate additional information could be the minimum value among the resource retention periods configured for the resource pool used by UE-A to generate additional information that are greater than or equal to 20 milliseconds. For example, the default value for the resource retention period used by UE-A to generate additional information could be 100 milliseconds. For example, the default value for the transmission resource retention period to be used by UE-A to generate additional information could be 20 milliseconds. For example, the UE can convert the transmission resource retention period value into a logical slot offset value based on available slots on the secondary link, the slot set in the resource pool, etc., and then use the converted value to generate / obtain additional information. For example, the information could be a reference value used to generate the additional information. For example, the information could be information sent by UE-B when requesting to send additional information from UE-A, and UE-A could use this information when generating the additional information.For example, UE-A can generate additional information using the following: information related to multiple transmission priorities, information related to transmission resource reservation periods, information related to transmission resource reselection counters, information related to the start time of the transmission resource selection window, information related to the size or end time of the transmission resource selection window, and / or information related to the number of sub-channels used for PSSCH transmission, and UE-A can transmit each additional information to other UEs. In this case, for example, UE-B (e.g., a UE that has received the additional information) can select an appropriate one from the transmission packet information used to generate the additional information among multiple additional information, and UE-B can use it during UE-B's resource (re)selection process. For example, UE-B can select all or part of the same additional information among the information related to transmission priorities, information related to transmission resource reservation periods, information related to transmission resource reselection counters, and / or the number of sub-channels used for PSSCH transmission.

[0168] For example, based on information relating to reserved resources indicated by all or part of the received first SCI and / or second SCI and / or PSSCH, UE-A can determine resources to exclude within the resource selection window (hereinafter referred to as excluded resources). For example, UE-A can determine excluded resources based on reserved resources corresponding to a specific receive priority value. For example, the specific receive priority value can be a minimum value (among configured values). For example, the specific receive priority value can be a value less than or equal to a specific threshold. For example, a specific threshold can be configured or pre-configured for each resource pool. For example, a specific threshold can be configured or pre-configured for each congestion control level. For example, a specific threshold can be configured or pre-configured for each power control level. For example, a specific threshold can be configured or pre-configured for each UE type (e.g., pedestrian UE or vehicle UE). For example, a specific threshold can be configured among UEs via PC5-RRC signaling.

[0169] For example, UE-A can determine (reference) the reserved resources indicated by all or part of the received SCI within a resource selection window. For example, if resources are repeatedly reserved according to the resource reservation period indicated by the received SCI from the time UE-A detects the received SCI, UE-A can determine the position of the resources within the resource selection window. For example, UE-A can determine the number of times the reserved resources according to the received SCI are repeated within the resource selection window based on the resource reservation period and information about the resource selection window (e.g., the size or end time of the resource selection window). For ease of description, the reserved resources indicated / reserved within the resource selection window by the received SCI are referred to as a received resource pattern. For example, UE-A can generate / determine a transmission resource pattern based on the transmission reserved resource period, a transmission resource reselection counter, and / or the sub-channel used for PSSCH transmission. For example, the transmission pattern can be repeated as many times as the transmission resource reselection counter value at the start time-frequency resource of a particular pattern for the transmission reserved resource period. For example, UE-A can start with the first time slot and the first sub-channel group of the resource pool in the resource selection window, which serves as the start time of the transmission resource pattern, and check whether a portion of the resources overlaps with the received resource pattern. Next, for example, for the starting time slot and starting sub-channel group of the transmission resource pattern that causes the transmission resource pattern and the received resource to overlap in at least one resource, if the RSRP value measured by UE-A based on the received PSSCH DMRS is greater than or equal to a specific RSRP threshold, UE-A can set / determine the corresponding time slot and sub-channel group as excluded resources. For example, the RSRP threshold can be a value configured based on a combination of a reference transmission priority and a reception priority corresponding to the received resource pattern. For example, UE-A can set / determine the time slot and sub-channel group of the transmission resource pattern that overlaps with the received resource pattern generated based on the received SCI and / or other additional information as excluded resources, regardless of the RSRP measurement value. For example, if the ratio of available resources in the reference resource selection window is less than or equal to a specific resource ratio threshold, UE-A can perform an increase for the RSRP threshold, and UE-A can reselect excluded resources based on the overlap with the received resource pattern. Alternatively, for example, UE-A might not perform an increase for the RSRP threshold to generate additional information.

[0170] Meanwhile, the reference transmission information assumed by UE-A when generating additional information and the transmission information of UE-B receiving additional information may be different. Therefore, when UE-A configures additional information in the manner described above, it is necessary to define a method for UE-B to apply it. For example, basically, even if the transmission resource reservation period and / or resource reselection counter value are different, UE-B may not include a specific transmission pattern or specific resource on the time slot associated with the non-preferred resource indicated by the additional information in the available resource set. The specific transmission pattern or specific resource may correspond to the frequency domain resource within the time slot, and the specific method used for this may follow the following embodiments. For example, basically, even if the transmission resource reservation period and / or resource reselection counter value are different, UE-B may include a specific transmission pattern or specific resource on the time slot associated with the preferred resource indicated by the additional information in the available resource set. For example, a first method for excluding resources indicated by FRIV and / or TRIV in the SCI received by the UE and a second method for excluding resources repeatedly indicated after the resource reservation period indicated by the SCI received by the UE and / or the additional information may be different. This is because resources prior to the application resource reservation period are highly likely to be used by the UE that has sent SCI and / or additional information, while the corresponding resources in the next period are relatively unlikely to be used by the UE. For example, an RSRP threshold for selecting available resources by the UE in the first method and (ii) a RSRP threshold for selecting available resources by the UE in the second method can be configured or pre-configured to the UE differently. For example, if the ratio of available resources to resources within the resource selection window after the UE selects available resources is less than or equal to a (pre-)configured threshold, the UE can consider / use resources derived from the FRIV and / or TRIV indicated in the received SCI when selecting available resources even after the RSRP threshold has increased. On the other hand, for example, when selecting available resources after the RSRP threshold has increased, the UE can disregard / use resources in the next resource reservation period. In this context, when UE-A (e.g., the UE sending additional information) indicates preferred or non-preferred resources, UE-A can express / send them by distinguishing between: (i) preferred or non-preferred resources determined based on resources indicated by FRIV and / or TRIV indicated in the received SCI, and (ii) preferred or non-preferred resources determined based on resources repeatedly indicated after the resource retention period indicated in the received SCI and / or additional information (e.g., resources indicated by TRIV and / or FRIV in time slots after the resource retention period from the time of SCI reception).For example, in determining available resources based on the first method, available resources can be determined based on the UE's sensing results and / or additional information until the number of times the RSRP threshold increases is less than (or equal to or less than) a (pre-)configured number. For example, in determining available resources based on the first method, if the number of times the RSRP threshold increases is greater than (or equal to or greater than) a (pre-)configured number, available resources can be determined using the UE's sensing results without using additional information. For example, in determining available resources based on the second method, available resources can be determined based on the UE's sensing results and / or additional information until the number of times the RSRP threshold increases is less than (or equal to or less than) a (pre-)configured number. For example, in determining available resources based on the second method, if the number of times the RSRP threshold increases is greater than (or equal to or greater than) a (pre-)configured number, available resources can be determined using the UE's sensing results without using additional information.

[0171] For example, when UE-A sends additional information to UE-B including information related to non-preferred resources, if the number of sub-channels used by UE-A to generate the additional information is greater than (or equal to or greater than) the number of transmission sub-channels of UE-B, then UE-B can exclude UE-B's transmission patterns or resources that have the same starting sub-channel as the transmission pattern or resource indicated / included in the additional information from the set of available resources. For example, if the last transmission pattern in the frequency domain within a specific time slot is indicated as a non-preferred resource in the additional information, then UE-B can exclude all transmission patterns of UE-B that may overlap with that transmission pattern from the set of available resources. Alternatively, for example, UE-B can exclude all of UE-B's transmission patterns or resources that overlap with the transmission pattern or resource indicated in the additional information from the set of available resources. For example, the process of UE-B excluding resources from the set of available resources can be limited to cases where the RSRP measurement value corresponding to the resource is greater than or equal to the RSRP threshold. Alternatively, for example, UE-B can perform the process of excluding resources from the set of available resources regardless of the RSRP measurement value.

[0172] For example, when UE-A sends additional information to UE-B including information related to non-preferred resources, if the number of sub-channels used by UE-A to generate the additional information is less than (or equal to or less than) the number of transmission sub-channels of UE-B, then UE-B can exclude UE-B's transmission patterns or resources from the available resource set that partially overlap with the transmission patterns or resources indicated / included in the additional information. Alternatively, for example, if UE-B's transmission patterns or resources are in the form of including the transmission patterns or resources indicated in the additional information, then UE-B can exclude UE-B's transmission patterns or resources from the available resource set. For example, the process of UE-B excluding resources from the available resource set can be limited to cases where the RSRP measurement value corresponding to the resource is greater than or equal to the RSRP threshold. Alternatively, for example, UE-B can perform the process of excluding resources from the available resource set regardless of the RSRP measurement value.

[0173] For example, when UE-A sends additional information to UE-B including information related to preferred resources, if the number of sub-channels used by UE-A to generate the additional information is greater than (or equal to or greater than) the number of transmission sub-channels of UE-B, then UE-B may include all or part of the transmission patterns or resources of UE-B that overlap with the transmission patterns or resources indicated / included in the additional information in the set of available resources.

[0174] For example, when UE-A sends additional information to UE-B including information related to preferred resources, if the number of sub-channels used by UE-A to generate the additional information is less than (or equal to or less than) the number of transmission sub-channels of UE-B, then UE-B can include UE-B's transmission pattern or resources in the available resource set only if all of UE-B's transmission patterns or resources overlap with the transmission patterns or resources indicated / included in the additional information.

[0175] For example, the above-described method for excluding resources may vary depending on the transmission packet information of the UE-B that has received the additional information (e.g., the size or location of the resource selection window, the resource reselection counter, periodic / aperiodic resource reservation, cases where SCI is not detected due to half-duplex constraints, or the frequency at which SCI is not detected due to half-duplex constraints). For example, if the size of the UE-B's resource selection window is greater than (or equal to or greater than) a (pre-configured) threshold, the UE-B can exclude all resources or transmission patterns of the UE-B that overlap with the non-preferred resources or non-preferred patterns indicated / included in the additional information from the set of available resources. For example, if the size of the UE-B's resource selection window is less than (or equal to or less than) a (pre-configured) threshold, the UE-B can use a portion of the UE-B's transmission patterns that overlap with the non-preferred resources or non-preferred patterns indicated / included in the additional information. The above method may follow an embodiment of determining the UE-B's transmission pattern from non-preferred resources. For example, if UE-B fails to detect an SCI frequency less than (or equal to or less than) a (pre-configured) threshold within its sensing window, UE-B can exclude all resources or transmission patterns of UE-B that overlap with non-preferred resources or non-preferred patterns indicated / included in the supplementary information from the set of available resources. For example, if UE-B fails to detect an SCI frequency greater than (or equal to or greater than) a (pre-configured) threshold within its sensing window, UE-B can use a portion of its transmission patterns that overlap with non-preferred resources or non-preferred patterns indicated / included in the supplementary information. The above method can follow embodiments that determine UE-B's transmission patterns from non-preferred resources. For example, if UE-B determines available resources within its resource selection window without using / considering supplementary information, and if the ratio of available resources is greater than (or equal to or greater than) a (pre-configured) ratio, UE-B can exclude all resources or transmission patterns of UE-B that overlap with non-preferred resources or non-preferred patterns indicated / included in the supplementary information from the set of available resources. For example, if UE-B determines available resources within a resource selection window without using / considering additional information, and if the ratio of available resources is less than (or equal to or less than) a (pre-)configured ratio (the ratio of available resources may still be greater than or equal to a threshold allowed during the resource selection process), then UE-B may use a portion of a transmission pattern that overlaps with a non-preferred resource or non-preferred pattern indicated / included in the additional information. In embodiments of this disclosure, the case where UE-A indicates non-preferred resources using additional information has been described, and the process by which UE-B determines non-preferred resources based on additional information has been described. However, embodiments of this disclosure can be extended and applied to cases where other additional information indicates preferred resources, to methods that use resources indicated in other additional information more aggressively or at a certain level or above, or to methods that use resources indicated in other additional information more passively or at a certain level or below.For example, UE-B can determine the set of available resources based on sensing results within the preferred resources or preferred pattern set indicated / included in the supplementary information. In this case, for example, if the ratio of available resources to total resources in the resource selection window is less than (or equal to or less than) a (pre-)configured ratio while UE-B is using / considering the supplementary information, UE-B can again include resources other than the preferred resources indicated / included in the supplementary information in the transmission resources or transmission pattern based on UE-B's sensing results (only if the RSRP measurement value is less than (or equal to or less than) the RSRP threshold). For example, resources other than the preferred resources indicated / included in the supplementary information can be preferred resources indicated in other supplementary information received by UE-B. For example, if the ratio of available resources to total resources in the resource selection window is less than (or equal to or less than) a (pre-)configured ratio while UE-B is using / considering the supplementary information, UE-B can ignore the preferred resources indicated / included in the supplementary information and select available resources again based on UE-B's sensing results. In embodiments of this disclosure, when UE-B is provided with preferred resources, the ratio of available resources to total resources within the selection window can be replaced by the ratio of available resources within the selection window to the amount of preferred resources indicated in the additional information. For example, if UE-B receives preferred resource set information from multiple UEs, and / or if the preferred resource set is a set of resources expected to simultaneously receive PSCCH / PSSCH transmissions from UE-B (e.g., in the case of multicast and / or broadcast), then UE-B can determine available resources within the intersection of multiple preferred resource sets. In this case, for example, if the amount of preferred resources determined based on the intersection within UE-B's selection window is below a certain level (e.g., if the ratio of the intersection resource amount to total resources within the selection window is less than or equal to a (pre-)configured threshold), then UE-B can determine available resources within the union of multiple preferred resource sets. For example, before applying sensing results, UE-B can check whether the amount of preferred resources determined based on the intersection within UE-B's selection window is less than or equal to a threshold / threshold ratio. For example, after applying the sensing results, the UE-B can check whether the preferred resource quantity determined by the intersection within the UE-B's selection window is less than or equal to the threshold / threshold ratio.

[0176] For example, if UE-B performs partial sensing (e.g., sensing only for a portion of the time slots within a sensing window, or sensing only for sensing time slots associated with available time slots after determining available time slots within a selection window), the number of available time slots within the selection window based on the non-preferred and / or preferred resources indicated / included in the supplementary information may be less than a (pre-)configured threshold (e.g., a minimum number of available time slots). In this case, 1) the UE may cancel the use of the supplementary information, or 2) the UE may include resources in the available resources (e.g., resources not occupied by other SCIs based on the results of continuous partial sensing (e.g., sensing for consecutive logical time slots prior to available resources), or resources where the RSRP measurement is less than or equal to a (pre-)configured threshold), or 3) the UE may include preferred resources other than the available time slots of UE-B indicated / included in the supplementary information in the available resources. In embodiments of this disclosure, if the number of available time slots in the selection window of non-preferred resources and / or preferred resources indicated / included in the supplementary information is less than a (pre-)configured threshold (e.g., the minimum number of available time slots), it can again be replaced and applied as follows: based on the UE-B's sensing results, the ratio of available resources in available time slots to total resources is less than a (pre-)configured threshold. In embodiments of this disclosure, if the number of available time slots in the selection window of non-preferred resources and / or preferred resources indicated / included in the supplementary information is less than a (pre-)configured threshold (e.g., the minimum number of available time slots), it can again be replaced and applied as follows: based on the UE-B's sensing results, the ratio of available resources in available time slots that are preferred resources indicated in the supplementary information to total resources is less than a (previously) set threshold. In this case, for example, if resources other than available time slots of the UE-B indicated in the supplementary information are included in the candidates that can be available resources, the UE-B can calculate / obtain the ratio of available resources by including resources other than available time slots in the denominator.

[0177] Simultaneously, at least one of the transmission priority, transmission resource reservation period, transmission resource reselection counter, and / or the number of sub-channels used by UE-A to generate supplementary information may differ from the transmission packet information of UE-B that has received the supplementary information. In this case, the information regarding excluded resources included in the supplementary information needs to be independent of at least one of the following: transmission priority, transmission resource reservation period, transmission resource reselection counter, and / or the number of sub-channels used for PSSCH transmission. For example, UE-A may include information in the supplementary information regarding the receive resource pattern determined based on the reserved resources indicated in the received SCI and / or PSSCH. For example, if the RSRP value measured by UE-A from the corresponding PSSCH DMRS for each receive resource pattern is equal to or greater than a specific RSRP threshold, the location information of the time slots and sub-channels within the resource selection window may be included in the supplementary information. For example, the units of resources included in the supplementary information may be time slot groups and sub-channel groups. In this case, if the time slot groups and sub-channel groups include receive resource patterns with RSRP values ​​greater than or equal to the RSRP threshold, a combination of corresponding groups may be included in the supplementary information. For example, the RSRP threshold can be a value determined from a reference transmission priority and a reception priority corresponding to each reception resource pattern. For example, the RSRP threshold can be a value configured separately for each reception priority, and the RSRP threshold can be a value selected based on the reception priority corresponding to each reception resource pattern. For example, the RSRP threshold can be a value configured or pre-configured to the UE regardless of the transmission priority and / or reception priority. In this case, if there is an excluded resource indicated by the additional information within the resource selection window of UE-B, the UE-B that has received the additional information can check / determine whether the corresponding resource overlaps with a transmission resource pattern generated based on at least one of the UE-B's transmission resource retention period, transmission resource reselection counter, and / or the number of sub-channels used for PSSCH transmission. Through this, the UE-B can finally determine the available resources for UE-B. The information about excluded resources included in the additional information can only be used when the transmission priorities of UE-B are the same. For example, a step size (e.g., 3dB) for increasing the RSRP threshold can be configured or pre-configured to the UE. For example, a step size for increasing the RSRP threshold can be included in the additional information.

[0178] For example, UE-A may determine available resources within a resource selection window based on information related to reserved resources indicated by all or part of the first SCI and / or second SCI and / or PSSCH received by UE-A. For example, the additional information may not include the resources selected by UE-A within the reference resource selection window, or information corresponding to them. For example, when the additional information includes information related to available resources in the resource selection window, it may not include information related to excluded resources determined based on information related to reserved resources indicated by all or part of the first SCI and / or second SCI and / or PSSCH received by UE-A, as in the above embodiments. That is, the additional information may or may not include information related to reserved resources of other UEs determined based on RSRP measurements. For example, regardless of the RSRP measurement, the additional information may not include information related to resources within the resource selection window corresponding to reserved resources indicated by the first SCI and / or second SCI and / or PSSCH received by UE-A. This is because even if the interference is determined to be low from UE-A's point of view, the interference may be high from UE-B's point of view.

[0179] In this paper, during resource selection, UE-B can consider resources indicated by SCIs detected by UE-A but not by UE-B. For example, when UE-B performs resource (re)selection, UE-B can, based on the above information, not (re)select resources indicated by SCIs detected by UE-A but not by UE-B. In other words, according to the above method, interference from UEs unknown to UE-B due to the hidden node problem can be minimized.

[0180] Based on embodiments of this disclosure, UE-A can configure or suggest conditions to UE-B for the use of all or part of resources. For example, UE-A can configure or suggest conditions to UE-B for the inability to use all or part of resources. For example, auxiliary information may include conditions under which UE-B can use all or part of resources and / or conditions under which UE-B cannot use all or part of resources. For example, conditions may include specific priorities. For example, conditions may include service types. For example, conditions may include QoS parameters. For example, conditions may include broadcast types. For example, conditions may include whether SL HARQ feedback is enabled. For example, conditions may include SL HARQ feedback options. For example, conditions may include the range of RSRP measurements.

[0181] For example, conditions may include a single L1 and / or L2 destination ID or multiple L1 and / or L2 destination IDs. In this case, for example, if the destination ID used for PSCCH / PSSCH is the same as the ID that can utilize the resource information provided by UE-A, then UE-B can determine the PSCCH / PSSCH transmission resources by using the provided resource information. For example, based on the source ID and / or destination ID and / or additional information used by UE-A to provide resource information for PSCCH and / or PSSCH, and the ID information used for that resource information, if the destination ID used for PSCCH / PSSCH corresponds to all or part of these IDs, then UE-B can perform resource (re)selection for PSCCH / PSSCH transmission by using the resource information. For example, the resource information provided by UE-A may be preferred resource information and / or non-preferred resource information when UE-B transmits PSCCH / PSSCH.

[0182] For example, UE-A can send information related to a specific time interval and / or information related to time-frequency resources to UE-B. Furthermore, for example, UE-A can send conditions for the availability of resources to UE-B.

[0183] For example, if the priority value is less than or equal to (less than) a specific threshold (pre-configured and / or configured via PC5-RRC), the UE-B can use the resource. Otherwise, the UE-B can suspend resource use or cancel already allocated transmissions.

[0184] For example, if the priority value is greater than or equal to (greater than) a specific threshold (pre-configured and / or configured via PC5-RRC), the UE-B can use the resources. Otherwise, the UE-B can suspend resource use or cancel already allocated transmissions.

[0185] For example, if the total or remaining packet delay budget (PDB) value is less than or equal to (less than) a specific threshold (pre-configured and / or configured via PC5-RRC), the UE-B can use the resources. Otherwise, the UE-B can suspend resource use or cancel already allocated transmissions.

[0186] For example, if the total or remaining packet delay budget (PDB) value is greater than or equal to (greater than) a specific threshold (pre-configured and / or configured via PC5-RRC), then the UE-B can use the resources. Otherwise, the UE-B can suspend resource use or cancel already allocated transmissions.

[0187] For example, if the RSRP measurement value corresponding to a resource (e.g., based on the values ​​measured by DMRS and / or CSI-RS on the PSCCH and / or PSSCH used to indicate the resource) is less than or equal to (less than) a third threshold, UE-B can suspend the use of the resource or cancel the already allocated transmission. Otherwise, UE-B can use the resource. For example, a third threshold can be configured or pre-configured for the UE for each resource pool. For example, a third threshold can be configured or pre-configured for the UE for each priority. For example, a third threshold can be configured or pre-configured for the UE for each QoS parameter. For example, a third threshold can be configured or pre-configured for the UE for each congestion control level. For example, a third threshold can be configured or pre-configured for the UE for each resource pool. Using the methods described above, for example, resources determined to have a good channel environment can be reserved for emergency communications.

[0188] For example, the unit for configuring resources can be a single sub-channel. Alternatively, the unit can be multiple sub-channels. For example, units for configuring / indicating resources corresponding to transmission delay targets or transmission priority targets can be configured or pre-configured for the UE for each resource pool. For example, units for configuring / indicating resources corresponding to transmission delay targets or transmission priority targets can be configured or pre-configured for the UE for each priority. For example, units for configuring / indicating resources corresponding to occurrence delay targets or transmission priority targets can be configured or pre-configured for the UE for each QoS parameter. For example, units for configuring / indicating resources corresponding to transmission delay targets or transmission priority targets can be configured or pre-configured for the UE for each congestion level. Using the above method, the number of consecutive resources in the frequency domain can be adjusted according to the size of the emergency message. For example, a large number of sub-channels can be allocated to emergency messages with larger sizes. For example, UE-A can receive emergency messages or emergency situations and / or related information (e.g., the size of the emergency message, service characteristics, duration, QoS parameters and / or priority, etc.) from higher layers (e.g., application layer and / or V2X layer and / or AS layer), and UE-A can determine / configure availability and / or unavailability conditions for specific resources based on this information.

[0189] Based on embodiments of this disclosure, UE-A can send information to UE-B related to the cancellation of all or part of resources previously reserved by UE-A. For example, auxiliary information may include information related to the cancellation of resources previously reserved by UE-A. For example, UE-A can indicate the resources corresponding to the reservation cancellation to UE-B again via a first SCI and / or a second SCI and / or PSSCH using a time resource indicator value (TRIV) and / or a frequency resource indicator value (FRIV) (resource allocation method). For example, UE-A can send a reservation cancellation indication value to UE-B via a first SCI and / or a second SCI and / or PSSCH. In this case, for resource reservation information received via a PSCCH and / or PSSCH previously sent by UE-A, UE-B can cancel the reserved resources upon receiving the reservation cancellation information or after a specific time (predefined or (pre-)configured value) from the corresponding time. Upon reservation cancellation, UE-B can trigger resource reselection. For example, UE-A can send / report information to the base station indicating the release of all or part of the resources allocated by the base station. For example, UE-A can send / report to the base station information indicating that it is not using all or part of the resources allocated by the base station. This report can be sent via PUCCH and / or PUSCH, for example. For example, UE-C (i.e., the third UE) can send to UE-B information indicating that UE-A is releasing all or part of the reserved resources. For example, if UE-A transmits a first TB on all or part of the reserved resources and UE-A determines that the target UE successfully received the first TB (i.e., ACK), then UE-A can determine / configure the release of subsequent reserved resources for the first TB. For example, if UE-A receives an ACK in unicast or multicast HARQ feedback option 2, or if UE-A does not receive a PSFCH indicating NACK in multicast HARQ feedback option 1, then UE-A can determine / configure the release of subsequent reserved resources for the same TB. For example, if UE-A performs (re)transmission for the same TB by more than the number of (re)transmissions on all or part of the reserved resources, then UE-A can determine / configure the release of subsequent reserved resources for the same TB. For example, if there is no remaining packet delay budget (PDB) for all or part of the reserved resources for the same TB, the UE-A can determine / configure the release of later reserved resources for the same TB. For example, if the remaining PDB for all or part of the reserved resources for the same TB is lower than (e.g., less than or equal to) a specific threshold (configured (pre-) by PC5-RRC or predefined or configured), the UE-A can determine / configure the release of later reserved resources for the same TB.

[0190] The additional resource information described in the various embodiments of this disclosure may be in the form of indicating / representing frequency domain resources and / or time domain resources. For example, resource information may be in the form of one or more combinations of TRIV and / or FRIV and / or resource reservation period and / or priority and / or usage level. Each combination may be transmitted via a first SCI and / or a second SCI and / or PSSCH. For example, each resource group indicator combination may be included in different channels and / or signals and / or information. For example, the number of resource group indicator combinations may be configured or pre-configured for the UE for each resource pool. For example, the number of resource group indicator combinations may be configured or pre-configured for the UE for each first SCI indication value. For example, the number of resource group indicator combinations may be configured or pre-configured for the UE for each second SCI format. For example, the existence of the next resource group indicator combination may be indicated by the previous resource group indicator combination.

[0191] For example, TRIV can indicate / represent i) the time when the UE-B receives the SCI and / or ii) one or two slot offset values ​​from that time. In this document, TRIV can indicate / represent up to three time-domain resources. For example, TRIV can indicate / represent i) the time of the most recent resource in time among the time-domain resources derived from the TRIV indicated by the first SCI and / or ii) one or two slot offset values ​​from that time. For example, TRIV can indicate / represent i) the time of the most recent resource in time among the time-domain resources indicated by the previous resource group indicator and / or ii) one or two slot offset values ​​from that time. For example, various forms of TRIV and reference points can be used in combination. For example, the case where the SCI reception time is the reference point can be the case where TRIV is transmitted via the first SCI and / or the case where TRIV is transmitted via the second SCI. For example, using the last PSSCH resource time indicated by the first SCI or the last PSSCH resource time indicated by a previous group indicator as a reference point could be a case where TRIV is sent via the second SCI and / or via PSSCH. For example, the maximum slot offset number (e.g., 1 or 2) that can be indicated / represented by TRIV for each resource group indicator can be the same as the TRIV configuration of the first SCI. For example, the maximum slot offset number that can be indicated / represented by TRIV for each resource group indicator can be configured or pre-configured for the UE for each resource group indicator. For example, the maximum slot offset number that can be indicated / represented by TRIV for each resource group indicator can be configured or pre-configured for the UE for each second SCI format. For example, the maximum slot offset number that can be indicated / represented by TRIV for each resource group indicator can be configured or pre-configured for the UE for each resource pool. For example, information related to the maximum slot offset number that can be indicated / represented by TRIV for each resource group indicator can be sent via the first SCI. For example, information related to the maximum slot offset that can be indicated / represented by TRIV for each resource group indicator can be sent via a second SCI. For example, information related to the maximum slot offset that can be indicated / represented by TRIV for each resource group indicator can be sent via PSSCH. For example, the maximum slot offset can be 1 or 2.

[0192] For example, the maximum slot offset number can vary depending on the size of the TRIV indicator. For example, the maximum slot offset number can exceed two. For example, the UE can indicate up to M slot offsets within a W slot window following the reference slot of the TRIV. In this case, for example, the size of the indicator for the corresponding TRIV can be determined by the W and M values. For example, the size of the indicator for the TRIV can be expressed by the following formula.

[0193] [Formula 1]

[0194]

[0195] [Equation 2]

[0196]

[0197] For example, the resource index value corresponding to the slot offsets after s0, s1-1, s2, and s3-1 from the reference point of TRIV can be expressed by the following formula.

[0198] [Formula 3]

[0199] in,

[0200] For example, a time-domain resource indicator may include TRIV and resource retention period information for the resource indicated by TRIV.

[0201] For example, the length or number of time slots that can be indicated / represented by TRIV for each resource group indicator can be configured or pre-configured for the UE. For example, the length or number of time slots that can be indicated / represented by TRIV for each resource group indicator can be configured or pre-configured for the UE for each second SCI format. For example, the length or number of time slots that can be indicated / represented by TRIV for each resource group indicator can be configured or pre-configured for the UE for each resource pool.

[0202] For example, an FRIV can indicate / represent the number of subchannels allocated for a single PSSCH resource or multiple PSSCH resources, and / or the start subchannel index of the PSSCH resource indicated / represented by the TRIV, excluding the time when the UE-B receives the SCI. For example, an FRIV can indicate / represent the number of subchannels allocated for a single PSSCH resource or multiple PSSCH resources, and / or the start subchannel index of one or two PSSCH resources indicated / represented by the TRIV. For example, one or two PSSCH resources can be resources located after the last PSSCH resource indicated / represented by the first SCI. For example, one or two PSSCH resources can be resources located after the last PSSCH resource indicated / represented by the previous resource group indicator. For example, multiple forms of FRIVs and reference points can be used in combination.

[0203] For example, the number of sub-channels allocated, indicated / represented by the FRIV for each resource group indicator, can be the same. In this case, the FRIV for the resource group indicator transmitted other than the first SCI may not include information related to the number of allocated sub-channels. That is, information related to the number of allocated sub-channels can be excluded / omitted from the FRIV for the resource group indicator transmitted other than the first SCI.

[0204] For example, the number of subchannels allocated by FRIV for each resource group indicator can be different. This method may be particularly useful when the corresponding TB is different for each resource group. For example, the maximum number of PSSCH resources that can be indicated / represented by FRIV for each resource group indicator can be the same as the FRIV configuration of the first SCI. For example, the maximum number of PSSCH resources that can be indicated / represented by FRIV for each resource group indicator can be configured or pre-configured for the UE for each resource group indicator. For example, the maximum number of PSSCH resources that can be indicated / represented by FRIV for each resource group indicator can be configured or pre-configured for the UE for each second SCI format. For example, the maximum number of PSSCH resources that can be indicated / represented by FRIV for each resource group indicator can be configured or pre-configured for the UE for each resource pool. For example, information related to the maximum number of PSSCH resources that can be indicated / represented by FRIV for each resource group indicator can be sent through the first SCI. For example, information related to the maximum number of PSSCH resources that can be indicated / represented by FRIV for each resource group indicator can be sent through the second SCI. For example, information related to the maximum number of PSSCH resources that can be indicated / represented by FRIV for each resource group indicator can be sent via PSSCH.

[0205] For example, the priority value can be the same for each resource group indicator. In this case, the combination of resource group indicators sent other than the first SCI may not include priority information. That is, priority information can be excluded / omitted from the combination of resource group indicators sent other than the first SCI.

[0206] For example, the priority value indicated / represented by each resource group indicator can be different. For example, for a reserved resource group indicated / represented by a received resource group indicator, the UE-B can, when (re)selecting resources, apply differently whether to exclude resources based on RSRP measurements by using a threshold corresponding to the priority used for each group. For example, RSRP can be measured based on DMRS and / or CSI-RS used to indicate the corresponding information in the PSCCH and / or PSSCH. For example, the threshold can be configured differently for each resource group and / or for each usage level. For example, even for the same transmit / receive priority combination, the threshold can differ depending on the resource group. Specifically, for example, the threshold can be determined based on a combination of: i) the priority value indicated by the SCI received by the UE, and i) the priority value of the data to be transmitted by the UE. In this document, for example, the threshold can be different for each resource group indicator. For example, the threshold for the resource group indicated by the first SCI can be different from the threshold for the resource group indicated by the resource group indicator.

[0207] For example, the usage level value can be the same for each resource group indicator. In this case, the combination of resource group indicators may not include usage level information. That is, usage level information can be excluded or omitted from the combination of resource group indicators.

[0208] For example, the usage level value indicated / represented by each resource group indicator can be different. For example, for a reserved resource group indicated by the received resource group indicator, the UE-B can determine resource exclusion based on the RSRP measurement and a specific threshold. Then, the UE-B can exclude resources from the (re)selected available resource set (finally) according to the usage level. Alternatively, the UE-B can include resources in the (re)selected available resource set (finally) according to the usage level. For example, the RSRP can be measured based on the DMRS and / or CSI-RS of the PSCCH and / or PSSCH used to indicate the corresponding information. For example, whether a resource can be included in the available resource set can be configured or pre-configured for the UE for each usage level. For example, the UE can randomly and probabilistically determine whether a resource can be included in the available resource set for each usage level. For example, if the reserved resource group includes N resources, the UE can randomly determine whether to include resources in the available resource set up to a specific ratio (e.g., M / N) or a specific amount (e.g., M) for each usage level. In this document, N can be a number greater than M. For example, a specific ratio or a specific amount can be predefined for the UE. For example, a specific ratio or amount can be configured or pre-configured for the UE. For example, even if the RSRP value of a resource exceeds a threshold, the UE-B may not perform resource exclusion probabilistically. For example, if the RSRP value of a resource exceeds a threshold, the UE-B may perform resource exclusion probabilistically. If the UE-B determines resource exclusion randomly and probabilistically, a probability value can be configured or pre-configured for the UE for each usage level. For example, for each usage level, it can be configured or pre-configured for the UE whether a resource is included in the set of available resources or excluded from the set of available resources. For example, for each usage level, it can be configured or pre-configured for the UE whether a resource is included in or excluded from the selected resources used for PSCCH / PSSCH transmission.

[0209] For example, the UE may need to perform resource exclusion for specific resource groups based on a level. For example, for a specific resource group with another level, the UE may include the corresponding resource group in preferred resources. For example, an RSRP threshold for resources may be (pre-configured) for each usage level. The UE-B may determine whether to use / consider the received information for each level.

[0210] For example, for a resource group with a first-level configuration, UE-B can be instructed / configured to exclude the corresponding resource. For example, UE-B can exclude resource groups configured as first-level. For example, to avoid half-duplex limitations, UE-A can configure resource sets where SL reception is impossible as first-level and provide them to UE-B. For example, to avoid the problem of overlapping transmission and reception by UE-A in the same time slot, UE-A can configure resource sets where SL reception is impossible as first-level, and UE-A can send information related to the resource sets configured as first-level to UE-B.

[0211] For example, for a resource group with a second-level configuration, UE-B can be instructed / configured to preferentially use the corresponding resources when transmitting PSCCH / PSSCH. For example, UE-B can transmit PSCCH / PSSCH by preferentially using a resource group configured as a second-level resource group. For example, UE-A can configure a resource set preferred for SL reception (for reasons such as low interference) as a second-level resource group and provide it to UE-B. For example, UE-A can configure a resource set preferred for SL reception as a second-level resource group, and UE-A can send information related to the resource set configured as a second-level resource group to UE-B.

[0212] For example, if the UE-B cannot use resources with a second level (e.g., if the amount of ultimately available resources compared to the information to be transmitted is less than or equal to a certain threshold), the UE-B may not use the resource information for the second level. On the other hand, the UE-B can select / determine the selected resources and / or available resources by referring to the resources for the second level.

[0213] For example, information about the level may include information about the purpose of the resources (e.g., to resolve hidden node issues, to resolve half-duplex limitations, to inform preferred resources, to resolve exposed node issues, and / or to resolve persistent conflicts, etc.) or information related to the UE-B and its corresponding operations. For example, information about the level may be information about how the UE-B, having received additional information, utilizes the resource information indicated in the additional information.

[0214] For example, a UE-B that has received supplementary information can use the corresponding indicated resources differently for each resource group level indicated in the supplementary information. For example, based on the RSRP value measured by the UE-B based on the PSSCH DMRS corresponding to the first SCI, second SCI, and / or PSSCH used to send the supplementary information, resources indicated at a specific level can be used to select available resources within the UE-B's resource selection window. For example, if the RSRP measurement value is greater than or equal to the RSRP threshold, the UE-B can exclude the corresponding indicated resources from the set of available resources within the resource selection window.

[0215] For example, if the RSRP value based on the RSRP measurement included in the supplementary information or its corresponding information (for each supplementary information or for each indicated resource group) is greater than or equal to the RSRP threshold, then UE-B can exclude resources with a specific level of indication from the set of available resources within the resource selection window. For example, additionally, UE-B can only use the corresponding supplementary information if the geographical distance between UE-B and UE-A is less than or equal to a specific level. For example, additionally, UE-B can only use the corresponding supplementary information if the RSRP measurement, Channel Busy Ratio (CBR) measurement, or Congestion Ratio (CR) measurement based on the signal transmitted by UE-A is greater than or equal to a specific level.

[0216] For example, UE-B can exclude resources with specific level indications from the set of available resources within its resource selection window. For example, UE-B can include resources with specific level indications from the set of available resources within its resource selection window. For example, UE-B can replace resources with specific level indications with available resources within its resource selection window. For example, UE-B can ultimately determine only those resources with specific level indications that overlap with the available resources within the resource selection window determined based on UE-B's sensing operations, as available resources within the resource selection window. In this case, for example, if the available resources based on UE-B's sensing operations do not overlap with resources indicated by additional information, or if the amount of resources included in the available resources indicated by additional information is less than or equal to the specific level (e.g., less than or equal to a (pre-)configured threshold), UE-B may not use the corresponding additional information. For example, when UE-B determines to select resources (only if resources with specific level indications are within UE-B's available resources), UE-B can first set / determine the resource with the corresponding indication as the selected resource. In this scenario, for example, if the amount of selected resources determined by UE-B based on resource information indicated by the additional information is insufficient for UE-B's transmission, UE-B may additionally select selected resources from the remaining available resources. For example, if the amount of selected resources determined by UE-B based on resource information indicated by the additional information is insufficient for UE-B's transmission, UE-B may select selected resources from its available resources regardless of the information indicated by the additional information.

[0217] For example, if UE-B compares resources with indicators of a specific level with its selected resources and determines that they overlap in whole or in part, UE-B can perform resource reselection for all or part of the selected resources. For example, if the overlap ratio between the resource indicated by the additional information and the selected resource is greater than or equal to a (pre-)configured threshold, UE-B can report / send information related to resource re-evaluation or preemption of the selected resource, and UE-B can replace the selected resource with another resource from the available resources.

[0218] In the embodiments of this disclosure, it has been described that the operation based on the additional information of UE-B is different for each level, but it is also possible to extend from the technical ideas of this disclosure that UE-B performs different resource selection operations for each additional information in another method.

[0219] For example, information about the level can be indicated / represented by the first SCI (e.g., by a reserved field). For example, information about the level can be sent as a subheader along with resource group information via a second SCI and / or PSSCH and / or MAC message and / or PC5-RRC signaling.

[0220] Simultaneously, compared to the total resource quantity, the ratio of resources that the UE-B can select for transmission during the resource (re)selection process should be equal to or greater than a (pre-)configured threshold. If the ratio of available resources is less than the threshold, the UE-B may again include all or part of the reserved resources among the reserved resources other than those indicated / represented by the first SCI in the available resources. For example, after the UE-B excludes the reserved resources indicated by the received first SCI and the reserved resources other than those indicated by the first SCI, the UE-B can calculate / obtain the amount of optional resources (e.g., available resources) for transmission. For example, the UE-B can calculate / obtain the amount of optional resources (e.g., available resources) for transmission excluding the reserved resources indicated by the received first SCI, and the UE-B can calculate / obtain the amount of optional resources (e.g., available resources) for transmission excluding the reserved resources other than those indicated by the received first SCI. That is, the amount of resources (e.g., available resources) that can be selected for transmission can be calculated / obtained, respectively (i) for excluding reserved resources indicated by the received first SCI and (ii) for excluding reserved resources other than those indicated by the received first SCI. In this case, for example, the threshold can be the same value as the first threshold used in excluding resources indicated / represented by the regular first SCI from available resources based on RSRP. For example, the threshold can be a second threshold different from the first threshold used in excluding resources indicated / represented by the regular first SCI from available resources based on RSRP. In this case, for example, the first threshold and / or the second threshold can be configured or pre-configured for the UE. For example, the first threshold and / or the second threshold can be pre-defined for the UE. In this document, for example, UE-B can preferentially include later-time reserved resources in the available resources. For example, UE-B can preferentially include earlier-time reserved resources in the available resources. For example, UE-B can preferentially include reserved resources corresponding to those reserved resources with lower priority in the available resources. In other words, UE-B can preferentially include reserved resources that correspond to those reserved resources with higher priority values ​​among the available resources.

[0221] For example, if the ratio of available resources is less than a threshold, the UE-B may again include all or part of the reserved resources other than those indicated / represented by the first SCI in the available resources. For example, the UE-B may perform an increase for the RSRP threshold (e.g., an increase of 3dB) without a process of converting reserved resources back into available resources. For example, if the UE-B performs an increase for the RSRP threshold, the UE-B may include all reserved resources other than those indicated / represented by the first SCI in the available resources.

[0222] For example, if UE-B performs an increase for the RSRP threshold, reserved resources can be excluded from the available resources until the number of available resources selected based on the increased RSRP threshold for reserved resources other than those indicated / represented by the first SCI exceeds the (pre-)configured threshold.

[0223] For example, if the ratio of available resources calculated based on reserved resources indicated by the first SCI is less than a first threshold, the UE may increase the RSRP threshold for the first SCI, and the UE may again execute the process of determining the available resources calculated based on reserved resources indicated by the first SCI. For example, if the ratio of available resources calculated based on reserved resources indicated by the first SCI is greater than or equal to the first threshold, the UE, excluding reserved resources indicated by the first SCI, may compare the ratio of available resources calculated based on reserved resources other than those indicated by the first SCI with a second threshold. In this case, for example, if the ratio of available resources calculated based on reserved resources other than those indicated by the first SCI is equal to or greater than the second threshold, the UE may determine the configuration for the available resource set. For example, if the ratio of available resources calculated based on reserved resources other than those indicated by the first SCI is less than the second threshold, the UE may increase the RSRP threshold for the first SCI, and the UE may again execute the process of determining the available resources calculated based on reserved resources indicated by the first SCI. For example, if the ratio of available resources calculated based on reserved resources other than those indicated by the first SCI is less than a second threshold, the UE may increase the RSRP threshold for the first SCI and the RSRP threshold for reserved resources indicated by the additional information, and the UE may again perform the process of determining available resources calculated based on reserved resources indicated by the first SCI and reserved resources indicated by the additional information.

[0224] For example, an upper limit for the first RSRP threshold can be configured or pre-configured for the UE for each resource pool. For example, an upper limit for the second RSRP threshold can be configured or pre-configured for the UE for each resource pool. For example, the maximum number of increases allowed for the first RSRP threshold can be configured or pre-configured for the UE for each resource pool. For example, the maximum number of increases allowed for the second RSRP threshold can be configured or pre-configured for the UE for each resource pool. For example, only an upper limit for the second RSRP threshold or the maximum number of increases allowed for the second RSRP threshold may exist. For example, when the first RSRP threshold or the second RSRP threshold no longer increases, the ratio of resources to available resources may be less than a resource ratio threshold. In this case, the UE can determine / select resources (for PSCCH / PSSCH transmission) from currently available resources. Alternatively, for example, when the first RSRP threshold or the second RSRP threshold no longer increases, the UE may not use reserved resources indicated by additional information, and the UE can determine / configure available resources solely based on reserved resources indicated by the first SCI.

[0225] For example, the ratio of available resources can be calculated / obtained as the ratio of the number of resources available for PSCCH / PSSCH transmission, determined based on reserved resources, to the total number of resources within the resource selection window (the number of combinations of sub-channels and time slots, or the number of combinations of sub-channel groups (which may be multiple) and time slots based on the UE's transmission information). In this case, for example, the UE can calculate / obtain the ratio of available resources based solely on the reserved resources indicated by the first SCI. For example, the UE can calculate / obtain the ratio of available resources based solely on the reserved resources indicated by additional information. For example, the UE can calculate / obtain the ratio of available resources based on the reserved resources indicated by both the first SCI and additional information.

[0226] For example, the ratio of available resources can be calculated / obtained as the ratio of the number of resources available for PSCCH / PSSCH transmission determined based on reserved resources indicated by the first SCI to the number of remaining resources (the number of combinations of sub-channels and time slots, or the number of combinations of sub-channel groups (which may be multiple) and time slots based on the UE's transmission information) after excluding resources based on reserved resources indicated by additional information from the total number of resources within the resource selection window.

[0227] For example, if UE-B calculates the ratio of the number of available resources to the total number of resources, the number of available resources can be determined solely based on the reserved resources indicated / represented by the first SCI. For example, if UE-B calculates the ratio of the number of available resources to the total number of resources, UE-B can determine whether to exclude reserved resources indicated / represented by the first SCI from the available resources based on sensing operations. That is, the number of available resources corresponding to the conditions used to trigger resource (re)selection can differ from the actual number of available resources. For example, the threshold can be the same value as the first threshold used in the process of excluding resources indicated / represented by the regular first SCI from the available resources based on RSRP. For example, the threshold can be a second threshold different from the first threshold used in the process of excluding resources indicated / represented by the regular first SCI from the available resources based on RSRP. In this case, for example, the first threshold and / or the second threshold can be configured or pre-configured for the UE. For example, the first threshold and / or the second threshold can be pre-defined for the UE.

[0228] For example, additional resource information can indicate / represent time-domain resources and / or time intervals. For example, UE-A can use a bitmap to indicate / represent all or a portion of the SL time slots within a specific time interval. For example, each bit of the bitmap can correspond to a time slot in the transmit resource pool and / or receive resource pool. For example, each bit of the bitmap can correspond to a group of time slots in the transmit resource pool and / or receive resource pool. For example, the number of time slots included in a time slot group can be configured or pre-configured for the UE for each resource pool. For example, the number of time slots included in a time slot group can be configured for the UE via PC5-RRC signaling. For example, the length of the bitmap can be configured or pre-configured for the UE for each resource pool. For example, the length of the bitmap can be configured for the UE via PC5-RRC signaling. For example, the bitmap can be repeatedly applied to the SL time slots in the resource pool. For example, the bitmap can be applied to the SL time slots in the resource pool once. For example, the bitmap can be repeatedly applied to the SL time slots in the resource pool as many times as (pre-)configured. For example, the bitmap can be repeatedly applied to the SL slots in the resource pool as many times as indicated by the first SCI. For example, the bitmap can be repeatedly applied to the SL slots in the resource pool as many times as indicated by the second SCI. For example, the bitmap can be repeatedly applied to the SL slots in the resource pool as many times as indicated by the PSSCH.

[0229] For example, the starting position of the time period corresponding to the bitmap can be the time slot in which the corresponding resource information is transmitted. For example, the starting position of the time period corresponding to the bitmap can be the time slot after a specific time slot offset from the time slot in which the corresponding resource information is transmitted. For example, a specific time slot offset can be configured or pre-configured to the UE for each resource pool. For example, the specific time slot offset can be indicated by a first SCI. For example, the specific time slot offset can be indicated by a second SCI. For example, the specific time slot offset can be indicated by PSSCH. For example, the specific time slot offset can be a parameter related to the resource selection window. For example, the specific time slot offset can be a first processing time with a value of 3, 5, 9, or 17 time slots based on the SL SCS. For example, if SL SCS = 15kHz, the specific time slot offset as the first processing time can be 3 time slots. For example, if SL SCS = 30kHz, the specific time slot offset as the first processing time can be 5 time slots. For example, if SL SCS = 60kHz, the specific time slot offset as the first processing time can be 9 time slots. For example, if SL SCS = 120kHz, the specific time slot offset for the first processing time could be 17 time slots. For example, the start position of the time period could be in the form of a DFN index and / or a logical time slot offset or a physical time slot offset, and the start position of the time period could be sent to the UE via auxiliary information. For example, the time slot offset could be a time slot index within the indicated DFN index. For example, the logical time slot index could be a time slot index for time slots belonging to a resource pool. For example, the logical time slot index could be a time slot index for time slots capable of SL communication (excluding S-SSB time slots). In this case, the time slots capable of SL communication could be time slots corresponding to cell-specific UL resources, with a number of symbol periods equal to the number of SL symbols starting from the SL start symbol.

[0230] For example, a second bitmap can also be used to indicate / represent the time interval to which the bitmap is applied. For example, UE-A can use the second bitmap to indicate / represent a portion of the time interval, and UE-A can use the first bitmap to indicate / represent SL slot information within the time interval indicated / represented by the second bitmap. For example, the length of the second bitmap can be configured or pre-configured for the UE for each resource pool. For example, the length of the second bitmap can be configured for the UE via PC5-RRC signaling. For example, time-domain resources can have a second period repeating in units of a first period value, and slots or slot groups repeating in units of a second period value within the second period. For example, a first offset (e.g., slot offset or absolute time offset) can be applied to the position relative to the second period within the first period. For example, a second offset (e.g., slot offset or absolute time offset) can be applied to indicate / represent the starting position of a slot or slot group within the second period.

[0231] For example, a first period value can be configured or pre-configured for the UE for each resource pool. For example, a second period value can be configured or pre-configured for the UE for each resource pool. For example, a first offset can be configured or pre-configured for the UE for each resource pool. For example, a second offset can be configured or pre-configured for the UE for each resource pool. For example, a first period value can be configured or pre-configured for the UE for each second SCI format. For example, a second period value can be configured or pre-configured for the UE for each second SCI format. For example, a first offset can be configured or pre-configured for the UE for each second SCI format. For example, a second offset can be configured or pre-configured for the UE for each second SCI format. For example, a first period value can be configured or pre-configured for the UE for each second SCI indication value. For example, a second period value can be configured or pre-configured for the UE for each second SCI indication value. For example, a first offset can be configured or pre-configured for the UE for each second SCI indication value. For example, a second offset can be configured or pre-configured for the UE for each second SCI indication value.

[0232] For example, all types and / or characteristics of available or unavailable data used for each resource group indicator can be the same. In this case, information related to the type and / or characteristics of available or unavailable data can be indicated / represented only once for multiple resource groups.

[0233] For example, the type and / or characteristics of available or unavailable data used for each resource group indicator can be different. For example, information related to the type and / or characteristics of available or unavailable data can include recommended priority values. For example, information related to the type and / or characteristics of available or unavailable data can include thresholds for priority values. For example, information related to the type and / or characteristics of available or unavailable data can include recommended QoS parameters. For example, information related to the type and / or characteristics of available or unavailable data can include recommended service types. For example, information related to the type and / or characteristics of available or unavailable data can include recommended transmission types (e.g., broadcast type and / or HARQ feedback / options and / or rank sum and / or MCS table and / or MCS index range and / or whether CSI reporting is supported). For example, information related to the type and / or characteristics of available or unavailable data can include thresholds for the remaining PDB. For example, UE-B can use the indicated priority value for the indicated resource. For example, UE-B can perform PSSCH transmission with a priority equal to or less than the priority threshold by using the indicated resource. For example, UE-B can use the indicated resources to not perform PSSCH transmissions other than the recommended transmission type and / or features.

[0234] For example, UE-A can send additional resource information via a second SCI. For example, UE-A can send additional resource information via PSSCH (e.g., higher-layer messages, such as MAC layer messages and / or AS layer messages and / or V2X layer messages). For example, UE-A can indicate a second SCI via a first SCI, and UE-A can indicate a third SCI via the second SCI, and UE-A can send additional resource information via the third SCI. Specifically, for example, UE-A can send a first SCI including information related to the second SCI, and UE-A can send a second SCI including information related to the third SCI, and UE-A can send a third SCI including additional resource information. Alternatively, for example, UE-A can send additional resource information via a third SCI. A first SCI is used to indicate a second SCI, and the UE-A can use the first SCI to indicate a third SCI, and the UE-A can use the third SCI to send additional resource information. Specifically, for example, the UE-A can send a first SCI including information related to the second SCI and information related to the third SCI, and the UE-A can send a third SCI including additional resource information. In this case, for example, the UE can map the third SCI (e.g., the coded modulation symbol used for the third SCI) to the PSSCH resource immediately following the mapping of the coded modulation symbol used for the second SCI. For example, the number of REs to which the third SCI (e.g., the coded modulation symbol used for the third SCI) is mapped. The number of REs mapped to the third SCI can be the same as the number of REs to which the second SCI corresponding to the third SCI is mapped. For example, the method for determining the number of REs mapped to the third SCI (e.g., the coded modulation symbol used for the third SCI) is the same as the method for determining the number of REs mapped to the second SCI, and can be determined based on at least one of the following: the size of the payload of the third SCI (e.g., the size of the payload including CRC bits), the beta (β) offset value, the coding rate value indicated in the first SCI, the alpha (α) value, and / or the upper limit value. In this case, for example, the beta offset value can be determined by the first SCI... The values ​​indicated by the first SCI and the values ​​corresponding to the second SCI. For example, the beta offset value is the value indicated by the first SCI and can be a value indicated separately from the value corresponding to the second SCI. For example, the beta offset value can be the value indicated by the second SCI. For example, the alpha value can be the value corresponding to the second SCI. For example, the alpha value can be a value (pre-configured) to the UE separately from the value corresponding to the second SCI. For example, the upper limit value can be the value corresponding to the second SCI. For example, the upper limit value can be the value obtained by subtracting the number of REs to which the second SCI is mapped from the value corresponding to the second SCI. For example, in TBS calculation, the UE can exclude the number of REs to which the third SCI is mapped.Specifically, for example, the UE can calculate / obtain the TBS without considering the number of REs to which the third SCI is mapped. For example, in the TBS calculation, the UE can include the number of REs to which the third SCI is mapped. Specifically, for example, the UE can calculate / obtain the TBS by considering / including the number of REs to which the third SCI is mapped. For example, the third SCI can be indicated by the second SCI, and the third SCI can include the remaining source ID information and / or destination ID information. For example, the UE can send a portion of the 24-bit ID through the second SCI, and the UE can send the remaining 24-bit ID through the third SCI. In this case, for example, the situation may be that the TB or MAC PDU is not included in the PSSCH. For example, when the UE sends additional information, the TB or MAC PDU sent through the PSSCH may only include the source ID information and / or destination ID information. For example, the UE that has received the additional information can determine whether to apply the corresponding additional information by checking the source ID and / or destination ID. In this scenario, for example, even if a UE that has detected an SCI determines to use additional information by checking the L1-source ID and / or L1-destination ID, the UE may not use the additional information before checking the remaining source ID information and / or destination ID information sent via the TB. For example, if a UE that has detected an SCI determines to use additional information by checking the L1-source ID and / or L1-destination ID, the UE may preferentially use the additional information when applying it. In this case, if the UE does not check the remaining source ID information and / or destination ID information sent via the TB corresponding to the additional information received later, the UE may cancel the use of the additional information. For example, a receiving UE may detect and use additional information sent via the first SCI and / or the second SCI and / or the third SCI, but the receiving UE may not detect the TB corresponding to the SCI. For example, a receiving UE may detect and use additional information sent via a TB or a portion of a MAC PDU, but the receiving UE may not detect the remaining TB or remaining MAC PDU corresponding to the SCI. That is, for example, a sending UE may send additional information and TB to different UEs simultaneously. In this scenario, for example, the UE may determine whether to detect additional information based on the L1-source ID and / or L1-destination ID and / or the reserved field value of the first SCI and / or whether the third SCI is indicated.

[0235] Simultaneously, if UE-B performs resource (re)selection using information related to additional reserved resources, SL transmission may be cancelled or SL transmission power may be reduced due to conflicts between UL and SL, potentially diminishing the benefits of using additional reserved resources. Therefore, for example, if UE-B transmits PSCCH / PSSCH and / or PSFCH on resources indicated / represented by UE-A, a threshold for UL-SL prioritization can be configured or pre-configured for the UE individually. For example, if UE-B transmits PSCCH / PSSCH and / or PSFCH on resources indicated / represented by UE-A, the priority of SL transmission can be configured high in UL-SL prioritization. For example, if UE-B performs resource (re)selection based on resources indicated / represented by UE-A, and UE-B performs PSSCH transmission using the (re)selected resources, a threshold for UL-SL prioritization can be configured or pre-configured for the UE individually. For example, if UE-B performs resource (re)selection based on resources indicated / represented by UE-A, and UE-B performs PSSCH transmission using the (re)selected resources, the priority of SL transmission can be configured as high in UL-SL prioritization.

[0236] For example, UE-B can determine whether to use the additional information (e.g., auxiliary information) described in various embodiments of this disclosure based on its geographical distance from UE-A, which provides the additional information. For example, UE-B may or may not use the additional information based on its geographical distance from UE-A, which provides the additional information. For example, UE-A may send the additional information described in various embodiments of this disclosure to UE-B, and UE-A may additionally send its geographic location information (e.g., region ID) to UE-B. For example, UE-A's geographic location information may be included in the additional information. For example, UE-B may obtain the distance between UE-B and UE-A based on UE-B's own location information (i.e., UE-B's location information) and UE-A's geographic location information. In this document, for example, if the distance is less than or equal to (less than) a specific threshold, UE-B may use the additional information received from UE-A. For example, if the distance is greater than (greater than or equal to) a specific threshold, UE-B may not use the additional information received from UE-A. For example, a threshold may be predefined for the UE. For example, a threshold may be configured or pre-configured for the UE. For example, the UE may randomly determine the threshold.

[0237] For example, UE-B can determine whether to use the additional information (e.g., auxiliary information) described in various embodiments of this disclosure based on the received power or quality of the signal or channel including the additional information. For example, UE-B may or may not use the additional information depending on the received power or quality of the signal or channel including the additional information. For example, UE-B can measure the RSRP value of the signal or channel including the additional information provided by UE-A. In this document, for example, if the RSRP value is greater than or equal to (greater than) a specific threshold, UE-B may use the additional information received from UE-A. For example, if the RSRP value is less than (less than or equal to) a specific threshold, UE-B may not use the additional information received from UE-A. For example, the threshold can be predefined for the UE. For example, the threshold can be configured or pre-configured for the UE. For example, the threshold can be randomly determined by the UE.

[0238] For example, UE-B can determine whether to use the additional information (e.g., auxiliary information) described in various embodiments of this disclosure based on the priority associated with the signal or channel including the additional information. For example, UE-B may or may not use the additional information depending on the priority of the signal or channel including the additional information. For example, UE-B may use the additional information received from UE-A if the priority value corresponding to the additional information is less than or equal to (less than) a specific threshold. For example, a low priority value may refer to a high priority. For example, UE-B may use the additional information received from UE-A if the priority value corresponding to the additional information is less than or equal to (less than) the priority value corresponding to UE-B's data transmission. For example, a threshold may be predefined for the UE. For example, a threshold may be configured or pre-configured for the UE. For example, the UE may determine the threshold randomly. For example, the priority of the signal or channel including the additional information may be the maximum of the priority values ​​that UE-A, which can use to send the additional information, can utilize. For example, the priority of the signal or channel including the additional information may be the minimum of the priority values ​​that UE-A, which can use to send the additional information, can utilize. For example, the priority of the signal or channel including the additional information may be the maximum of the priority values ​​of the resources available for sending the additional information through it. For example, the priority of a signal or channel including additional information can be the minimum priority value among the resources available to transmit the additional information via it. For example, the priority of a signal or channel including additional information can be the maximum priority value of a MAC PDU transmitted with the additional information. For example, the priority of a signal or channel including additional information can be the minimum priority value of a MAC PDU transmitted with the additional information. For example, the priority of a signal or channel including additional information can be configured or pre-configured for the UE for each resource pool. For example, the priority of a signal or channel including additional information can be configured or pre-configured for the UE for each resource pool congestion level. For example, the priority of a signal or channel including additional information can be configured or pre-configured for the UE for each service type. For example, the priority of a signal or channel including additional information can be configured or pre-configured for the UE for each UE speed. For example, the priority of a signal or channel including additional information can be configured or pre-configured for the UE for each QoS parameter.

[0239] For example, L1 source IDs and / or L2 source IDs of signals or channels including additional information can be configured or pre-configured for each UE for each resource pool. For example, L1 source IDs and / or L2 source IDs of signals or channels including additional information can be configured and shared among specific UEs (via PC5-RRC signaling). For example, the L1 source IDs and / or L2 source IDs of signals or channels including additional information can be configured as L1 destination ID values ​​and / or L2 destination ID values ​​that are expected to be received or attempted to be detected by the UE sending the additional information. For example, if the UE sending the additional information expects to receive data via multicast and / or broadcast, the UE can send additional information to the PSCCH / PSSCH that can be used for resource selection in relation to PSCCH / PSSCH transmissions corresponding to multicast and / or broadcast, and whether the PSCCH / PSSCH transmission is related to the additional information can be distinguished by the L1 source IDs and / or L2 source IDs of the signals or channels including the additional information. In this scenario, for example, a UE that has received additional information can use the additional information for resource (re)selection only if the L1 source ID value and / or L2 source ID value used to send the additional information are the same as the L1 destination ID value and / or L2 destination ID value of the PSCCH / PSSCH to be sent.

[0240] For example, L1 destination IDs and / or L2 destination IDs for signals or channels including additional information can be configured or pre-configured for each UE for each resource pool. For example, L1 destination IDs and / or L2 destination IDs for signals or channels including additional information can be configured and shared among specific UEs (via PC5-RRC signaling). For example, the L1 destination IDs and / or L2 destination IDs for signals or channels including additional information can be configured as L1 destination ID values ​​and / or L2 destination ID values ​​that are expected to be received or attempted to be detected by the UE sending the additional information. In this case, for example, the L1 source ID and / or L2 source ID of the signal or channel including additional information can be determined based on the source ID of the packet information of the UE or the UE sending the additional information.

[0241] For example, the broadcast type of a signal or channel including additional information can be configured or pre-configured for the UE for each resource pool. For example, whether to provide HARQ feedback for signals or channels including additional information can be configured or pre-configured for the UE for each resource pool. For example, HARQ feedback options including signals or channels for additional information can be configured or pre-configured for the UE for each resource pool.

[0242] For example, the transmitting UE can receive additional information from multiple UEs, and the transmitting UE can determine the PSCCH / PSSCH transmission resources by collecting and / or using additional information corresponding to the destination ID to be used for PSCCH / PSSCH transmission. For example, in the case of multicast, the additional information may be additional information sent by different receiving UEs to the transmitting UE. In this case, the transmitting UE can determine the transmission resources by prioritizing resources preferred by all or some of the receiving UEs, and / or the transmitting UE can determine the transmission resources by (as far as possible) avoiding resources not preferred by all or some of the receiving UEs.

[0243] Figure 12 The present disclosure illustrates a process for a UE to perform SL communication based on auxiliary information, according to an embodiment of the present disclosure. Figure 12 The embodiments can be combined with various embodiments of this disclosure.

[0244] Reference Figure 12 In step S1210, UE-B can receive SCI from UE-A via PSCCH. For example, SCI may include information for scheduling PSSCH. In step S1220, UE-B can receive auxiliary information from UE-A via PSSCH. For example, auxiliary information may be included in MAC PDU. For example, auxiliary information may include information presented in various embodiments of this disclosure. In step S1230, UE-B can select SL resources based on the auxiliary information.

[0245] In step S1240, UE-B may send PSCCH and / or PSSCH to UE-C based on the selected SL resources. Alternatively / additionally, in step S1250, UE-B may send PSCCH and / or PSSCH to UE-A based on the selected SL resources.

[0246] Meanwhile, the relationship between the UE sending additional information that can be used for resource (re)selection by the sending UE and the sending UE can be as follows. For example, 1) the sending UE can perform PSCCH / PSSCH transmission based on the additional information to the UE sending the additional information, or 2) the sending UE can perform PSCCH / PSSCH transmission based on the additional information to UEs other than the UE sending the additional information (e.g., including or excluding the UE sending the additional information). For example, the UE receiving the additional information can distinguish the scenario based on the values ​​of the source ID and / or destination ID used to send the additional information. For example, if the values ​​of the source ID and / or destination ID are (pre-)configured values ​​or values ​​configured via PC5-RRC, then the UE receiving the additional information can perform PSCCH / PSSCH transmission based on the additional information to UEs other than the UE sending the additional information. For example, the UE can distinguish the scenario based on the type of the additional information (e.g., preferred resource or non-preferred resource). For example, if the type of the additional information is non-preferred resource, then the UE sending the additional information can be the (unique) UE receiving the PSCCH / PSSCH transmission determined based on the additional information. For example, if the type of supplementary information is a non-preferred resource, the UE receiving the supplementary information may (only) perform PSCCH / PSSCH transmission based on the supplementary information to the UE sending the supplementary information. For example, if the type of supplementary information is a preferred resource, the UE other than the UE sending the supplementary information may be the UE receiving PSCCH / PSSCH transmission based on the supplementary information. For example, if the type of supplementary information is a preferred resource, the UE receiving the supplementary information may perform PSCCH / PSSCH transmission based on the supplementary information to both the UE sending the supplementary information and the UE other than the UE sending the supplementary information.

[0247] Simultaneously, the form of resources provided by UE-A to UE-B may need to be discontinuous in the frequency domain within the same time slot. For example, UE-A informing UE-B of resources that can or cannot be used in the form of discontinuous resources for future PSCCH / PSSCH transmissions may be advantageous in terms of resource utilization adaptability. Essentially, UE-B can send / provide information to UE-A regarding transmitted packets (e.g., including packet size / volume, priority information, coding rate, data rate, size of subchannels to be used, number of subchannels to be used, and / or number of PRBs to be used, etc.), and UE-A can determine the granularity of time and / or frequency resources to specific values ​​based on information received from one or more UEs. For example, the granularity of time and / or frequency resources provided by UE-A to UE-B can be configured or pre-configured for each resource pool. Similarly, the granularity of time and / or frequency resources provided by UE-A to UE-B can be configured or pre-configured for each UE group. For example, the granularity of time resources and / or frequency resources provided by UE-A to UE-B can be configured or pre-configured for each UE type. For example, the granularity of time resources and / or frequency resources provided by UE-A to UE-B can be configured or pre-configured for each power saving level. For example, when UE-A sends time resource information and / or frequency resource information to UE-B, UE-A can also send the granularity of time resources and / or frequency resources to UE-B.

[0248] For example, a UE can indicate discontinuous frequency resources within the same time slot based on multiple combinations of TRIV and FRIV. For the above method, the reference time in the TRIV method can be the same across different TRIVs. For example, the reference time of an additional TRIV can be the time slot position of the first PSSCH indicated by the first SCI. For example, the reference time of an additional TRIV can be the time slot position of the last PSSCH indicated by the first SCI. For example, in the case of the reference time of an additional TRIV, information about the reference time can be provided for each resource indicator group. For example, the information about the reference time can be a DFN index and / or a physical time slot offset or a logical time slot offset (the first logical time slot in the indicated DFN corresponds to an offset value of 0. Logical time slots are limited to time slots in the resource pool, time slots capable of secondary link communication, or cell-specific UL resources / time slots), which can be included in the auxiliary information. For example, the information about the reference time can be included in the auxiliary information in the form of a time slot index within the resource pool period. For example, information about reference time can be extended and applied to reference time for other time-domain resource indication methods besides TRIV (e.g., bitmap or periodic resource indication methods).

[0249] For example, for time-domain resources indicated by the TRIV method, bitmap method, or time-period and offset method, the UE can indicate frequency-domain resources in the form of a bitmap. For example, a single bitmap can be applied equally to multiple time-domain resources. For example, frequency-domain resources can be indicated in the form of a bitmap for each time-domain resource. For example, frequency-domain resources can be indicated in the form of a bitmap for each time-domain resource group. For example, each bit of the bitmap can correspond to each PRB in the resource pool. For example, each bit of the bitmap can correspond to each subchannel in the resource pool. For example, the size of the subchannel can be determined to be the same as the size of the subchannels in the resource pool used to transmit resource information. For example, the size of the subchannel can be determined to be the same as the size of a separate reference subchannel. For example, the size of the reference subchannel can be configured or pre-configured for the UE for each resource pool. For example, the size of the reference subchannel can be configured or pre-configured for the UE for each UE group. For example, the size of the reference subchannel can be configured or pre-configured for the UE for each UE type. For example, the size of the reference subchannel can be configured or pre-configured for the UE for each power-saving level. For example, the size of the reference subchannel can be configured or pre-configured for the UE for each resource indicator group. For example, each bit of the bitmap can correspond to a PRB group or sub-channel group within a resource pool. For example, the number of PRBs included in a PRB group, the number of sub-channels included in a sub-channel group, or the size of the sub-channels can be configured or pre-configured for the UE for each resource pool. For example, the number of PRBs included in a PRB group, the number of sub-channels included in a sub-channel group, or the size of the sub-channels can be configured or pre-configured for the UE for each UE group. For example, the number of PRBs included in a PRB group, the number of sub-channels included in a sub-channel group, or the size of the sub-channels can be configured or pre-configured for the UE for each UE type. For example, the number of PRBs included in a PRB group, the number of sub-channels included in a sub-channel group, or the size of the sub-channels can be configured or pre-configured for the UE for each power saving level. For example, the number of PRBs included in a PRB group, the number of sub-channels included in a sub-channel group, or the size of the sub-channels can be configured or pre-configured for the UE for each resource indicator group.

[0250] For example, a UE can indicate time and frequency resources as a two-dimensional bitmap. For example, each bit of the bitmap can correspond to a combination of (i) a time slot or time slot group in a resource pool and (ii) a PRB, sub-channel, PRB group, or sub-channel group in a resource pool within a specific time period. For example, the size of the bitmap can be predefined for the UE. For example, the size of the bitmap can be configured or pre-configured for the UE for each resource pool. For example, the size of the bitmap can be predefined for the UE. For example, the size of the bitmap can be configured or pre-configured for the UE for each UE group. For example, the size of the bitmap can be predefined for the UE. For example, the size of the bitmap can be configured or pre-configured for each UE type. For example, the size of the bitmap can be pre-defined for the UE. For example, the size of the bitmap can be configured or pre-configured for each power-saving level. For example, the starting position of the time period corresponding to the bitmap can be a time slot in which the corresponding resource information is transmitted. For example, the starting position of the time period corresponding to the bitmap can be a time slot after a specific time slot offset from the time slot in which the corresponding resource information is transmitted. For example, a specific time slot offset can be configured or pre-configured for the UE for each resource pool. For example, a specific time slot offset can be indicated by a first SCI. For example, a specific time slot offset can be indicated by a second SCI. For example, a specific time slot offset can be indicated by a PSSCH. For example, a specific time slot offset can be a parameter related to a resource selection window. For example, a specific time slot offset can be a first processing time with 3, 5, 9, or 17 time slots based on the SL SCS (corresponding to 15, 30, 60, and 120kHz SL SCS, respectively). For example, the length of the time period corresponding to the bitmap can be configured or pre-configured for the UE for each resource pool. For example, the length of the time period corresponding to the bitmap can be configured or pre-configured for the UE for each UE group. For example, the length of the time period corresponding to the bitmap can be configured or pre-configured for each UE type. For example, the length of the time period corresponding to the bitmap can be configured or pre-configured for each power saving level. For example, the length of the time period corresponding to the bitmap can be indicated by a first SCI. For example, the length of the time period corresponding to the bitmap can be indicated by a second SCI. For example, the length of the time period corresponding to the bitmap can be indicated by a PSSCH. For example, the length of the time period corresponding to the bitmap can be equal to the time period during which UE-A provides / transmits the corresponding resource indicator information to UE-B. For example, the length of the time period corresponding to the bitmap can be equal to the size of a specific resource selection window. For example, the size of a specific resource selection window can be the largest of the resource selection window sizes that the UE can select within the resource pool. For example, the size of a specific resource selection window can be the smallest of the resource selection window sizes that the UE can select within the resource pool. For example, the size of a specific resource selection window can be the average size of the resource selection windows that the UE can select within the resource pool.For example, the size of a particular resource selection window can be obtained by subtracting the first processing time from a parameter (e.g., t2min_SelectionWindow) configured by a higher layer (e.g., the RRC layer) for the end of the resource selection window (e.g., t2min_SelectionWindow). The time-domain description can be extended and applied to methods other than two-dimensional bitmaps (e.g., 1D bitmaps, TRIV methods). For example, the granularity of the time domain and the granularity of the frequency domain can be determined based on the number of time-domain partitions and / or the number of frequency-domain partitions (e.g., the number of PRBs / subchannels or the number of time slots included in the PRB / subchannel group and time slot group corresponding to each bit of the bitmap). For example, if the total number of time slots corresponding to the bitmap in the time domain is N and the number of time-domain partitions is P, the granularity of the time domain can be determined as N / P. For example, if the total number of time slots corresponding to the bitmap in the time domain is N and the number of time-domain partitions is P, the granularity of the time domain can be determined as a rounded-down value of N / P. For example, if the total number of time slots corresponding to the bitmap in the time domain is N and the number of time domain partitions is P, the granularity of the time domain can be determined as a rounded-up value of N / P. For example, if the total number of time slots corresponding to the bitmap in the time domain is N and the number of time domain partitions is P, the granularity of the time domain can be determined as a rounded-down value of N / P. For example, if the granularity of the time domain consists of multiple values, larger values ​​can be placed first in time. For example, if the granularity of the time domain consists of multiple values, large and small values ​​can be placed so that they are distributed as evenly as possible. For example, the number of partitions in the time domain and / or frequency domain can be configured or pre-configured for each UE for each resource pool. For example, the number of partitions in the time domain and / or frequency domain can be configured or pre-configured for each UE group. For example, the number of partitions in the time domain and / or frequency domain can be configured or pre-configured for each UE type. For example, the number of partitions in the time domain and / or frequency domain can be configured or pre-configured for each power-saving level. For example, the number of partitions in the time and / or frequency domains can be indicated by a first SCI. For example, the number of partitions in the time and / or frequency domains can be indicated by a second SCI. For example, the number of partitions in the time and / or frequency domains can be indicated by a PSSCH.

[0251] Simultaneously, multiple UEs can send additional information to the same UE, and the UE sending the additional information can receive additional information sent by other UEs. In the above scenario, UE-A (e.g., the UE sending the additional information or the UE intending to send the additional information) can generate additional information or determine whether to send additional information based on the additional information received by UE-A. For example, in specific situations (i) triggering the sending of additional information and / or (ii) when sending additional information, UE-A can skip sending the additional information. For example, specific situations may include UE-A receiving additional information from another UE and the target UE of the additional information is the same as the target UE of the additional information to be sent by UE-A. For example, specific situations may include UE-A receiving additional information from another UE and the resources indicated / included in the additional information are the same as the resources indicated / included in the additional information to be sent by UE-A. For example, specific situations may include UE-A receiving additional information from another UE and the resources indicated / included in the additional information and the resources indicated / included in the additional information to be sent by UE-A overlap by more than a certain level. In this case, for example, if the amount of resources that overlaps with the resources indicated in other supplementary information received by the UE-A is equal to or greater than a (pre-)configured threshold compared to the amount of resources that will be indicated in the supplementary information to be sent by the UE-A, the UE-A may skip sending the supplementary information.

[0252] Simultaneously, the UE can receive additional information from multiple UEs, and in particular, the UE can perform multicast transmission to all or part of the UE sending the additional information. In the above scenario, the UE can select resources for multicast transmission using additional information provided by the receiving UE (e.g., the UE undergoing multicast transmission). For example, if the additional information indicates a non-preferred resource, the UE can select a secondary link transmission resource by avoiding the non-preferred resource indicated in each additional information. For example, if the additional information indicates a preferred resource, the UE can select a secondary link transmission resource within the intersection of the preferred resources indicated in each additional information. For example, the UE can perform resource (re)selection based on the RSRP measurement value used to transmit the received additional information (e.g., an RSRP measurement value measured based on RS transmitted on the secondary link channel used to transmit the additional information) (in descending order of RSRP measurement value or RSRP measurement values ​​equal to or greater than a specific threshold) by using only a portion of the additional information. For example, the UE can perform resource (re)selection based on the RSRP measurement value used to transmit the received additional information (in order of lowest RSRP measurement value or RSRP measurement values ​​equal to or less than a specific threshold) by using only a portion of the additional information. For example, a UE can perform resource (re)selection based on the geographic distance / location corresponding to the transmission of received supplementary information (e.g., the distance between the UE sending the supplementary information and the UE receiving the supplementary information, or information corresponding to that distance) (in ascending order of distance or distances equal to or less than a specific threshold) by using only a portion of the supplementary information. For example, the specific value could be a value (pre-)configured for the UE.

[0253] Based on various embodiments of this disclosure, UE-B can efficiently perform (re)selection of resources for transmission by UE-B based on auxiliary information transmitted by UE-A. Furthermore, UE-A can transmit auxiliary information to UE-B if certain conditions are met. This solves the problem of wasted radio resources due to UE-A indiscriminately transmitting auxiliary information.

[0254] Figure 13 A method for performing wireless communication by a first device, based on an embodiment of the present disclosure, is illustrated. Figure 13 The embodiments can be combined with various embodiments of this disclosure.

[0255] Reference Figure 13In step S1310, the first device can send first secondary link control information (SCI) to the second device via the Physical Secondary Link Control Channel (PSCCH), including scheduling information for the Physical Secondary Link Shared Channel (PSSCH). For example, the first SCI may include information related to frequency resource allocation, information related to time resource allocation, information related to the demodulation reference signal (DMRS) pattern, and information related to the modulation and coding scheme (MCS). In step S1320, the first device can send first auxiliary information to the second device via the PSSCH. For example, the first auxiliary information may include information for secondary link (SL) resource selection by the second device.

[0256] Additionally, for example, the first device may select multiple SL resources for periodic SL transmission based on sensing within a sensing window. For example, a first auxiliary information may be sent to the second device based on a resource reselection counter associated with the periodic SL transmission reaching zero. For example, a first auxiliary information may be sent to the second device based on resource reselection being triggered for all or part of the multiple SL resources. For example, a first auxiliary information may be sent to the second device based on the reselection of all or part of the multiple SL resources.

[0257] For example, based on changes in the periodic uplink (UL) transmission of the first device, first auxiliary information can be sent to the second device. For example, based on changes in the active bandwidth portion (BWP) of the first device, first auxiliary information can be sent to the second device.

[0258] Additionally, for example, the first device may receive second auxiliary information, and the first device may receive a second SCI including information related to frequency resource allocation and information related to time resource allocation. For example, the second auxiliary information may include information for SL resource selection by the first device.

[0259] Additionally, for example, based on the number of times the Reference Signal Received Power (RSRP) threshold increases, the first device may determine multiple candidate resources based on at least one of second auxiliary information and second SCI. For example, if the number of times the RSRP threshold increases is less than or equal to the threshold, multiple candidate resources may be determined based on the second auxiliary information and second SCI. For example, if the number of times the RSRP threshold increases is greater than or equal to the threshold, multiple candidate resources may be determined based on the second SCI, and the second auxiliary information may not be used to determine multiple candidate resources.

[0260] For example, based on the fact that the destination ID associated with the second auxiliary information is equal to the destination ID used for transmission in the first device, multiple candidate resources can be determined based on the second auxiliary information and the second SCI.

[0261] For example, based on the fact that the source ID associated with the second auxiliary information is equal to the destination ID used for transmission in the first device, multiple candidate resources can be determined based on the second auxiliary information and the second SCI.

[0262] The proposed method can be applied to devices based on various embodiments of this disclosure. First, the processor 102 of the first device 100 can control the transceiver 106 to transmit first secondary link control information (SCI) to the second device via the Physical Secondary Link Control Channel (PSCCH), including scheduling information for the Physical Secondary Link Shared Channel (PSSCH). For example, the first SCI may include information related to frequency resource allocation, information related to time resource allocation, information related to the demodulation reference signal (DMRS) pattern, and information related to the modulation and coding scheme (MCS). Additionally, the processor 102 of the first device 100 can control the transceiver 106 to transmit first auxiliary information to the second device via the PSSCH. For example, the first auxiliary information may include information for secondary link (SL) resource selection for the second device.

[0263] Based on embodiments of this disclosure, a first apparatus adapted to perform wireless communication can be provided. For example, the first apparatus 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 instructions to: transmit, via a Physical Secondary Link Control Channel (PSCCH), a first Secondary Link Control Information (SCI) to a second apparatus including scheduling information for a Physical Secondary Link Shared Channel (PSSCH), wherein the first SCI includes information related to frequency resource allocation, information related to time resource allocation, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS); and transmit via the PSSCH, first auxiliary information to the second apparatus, wherein the first auxiliary information includes information for secondary link (SL) resource selection for the second apparatus.

[0264] Based on embodiments of this disclosure, an apparatus adapted to control a first user equipment (UE) can be provided. For example, the apparatus may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. For example, the one or more processors may execute instructions to: transmit, via a physical secondary link control channel (PSCCH) to a second UE, a first secondary link control information (SCI) including scheduling information for a physical secondary link shared channel (PSSCH), wherein the first SCI includes information related to frequency resource allocation, information related to time resource allocation, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS); and transmit via the PSSCH to the second UE first auxiliary information, wherein the first auxiliary information includes information for secondary link (SL) resource selection for the second UE.

[0265] Based on embodiments of this disclosure, a non-transitory computer-readable storage medium storing instructions can be provided. For example, when executed, the instructions can cause a first device to: transmit, via a Physical Secondary Link Control Channel (PSCCH), a first Secondary Link Control Information (SCI) including scheduling information for a Physical Secondary Link Shared Channel (PSSCH), wherein the first SCI includes information related to frequency resource allocation, information related to time resource allocation, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS); and transmit via the PSSCH, first auxiliary information to the second device, wherein the first auxiliary information includes information for secondary link (SL) resource selection for the second device.

[0266] Figure 14 A method for performing wireless communication by a second device, based on an embodiment of the present disclosure, is illustrated. Figure 14 The embodiments can be combined with various embodiments of this disclosure.

[0267] Reference Figure 14 In step S1410, the second device can receive first secondary link control information (SCI) from the first device via the Physical Secondary Link Control Channel (PSCCH), which includes scheduling information for the Physical Secondary Link Shared Channel (PSSCH). For example, the first SCI may include information related to frequency resource allocation, information related to time resource allocation, information related to the demodulation reference signal (DMRS) pattern, and information related to the modulation and coding scheme (MCS). In step S1420, the second device can receive first auxiliary information from the first device via the PSSCH. For example, the first auxiliary information may include information for secondary link (SL) resource selection for the second device.

[0268] The proposed method can be applied to apparatuses based on various embodiments of this disclosure. First, the processor 202 of the second apparatus 200 can control the transceiver 206 to receive first secondary link control information (SCI) from the first apparatus via the Physical Secondary Link Control Channel (PSCCH), including scheduling information for the Physical Secondary Link Shared Channel (PSSCH). For example, the first SCI may include information related to frequency resource allocation, information related to time resource allocation, information related to the demodulation reference signal (DMRS) pattern, and information related to the modulation and coding scheme (MCS). Additionally, the processor 202 of the second apparatus 200 can control the transceiver 206 to receive first auxiliary information from the first apparatus via the PSSCH. For example, the first auxiliary information may include information for secondary link (SL) resource selection for the second apparatus.

[0269] Based on embodiments of this disclosure, a second apparatus adapted to perform wireless communication can be provided. For example, the second apparatus 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 instructions to: receive, via a Physical Secondary Link Control Channel (PSCCH), first secondary link control information (SCI) from a first apparatus including scheduling information for a Physical Secondary Link Shared Channel (PSSCH), wherein the first SCI includes information related to frequency resource allocation, information related to time resource allocation, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS); and receive, via the PSSCH, first auxiliary information from the first apparatus, wherein the first auxiliary information includes information for secondary link (SL) resource selection for the second apparatus.

[0270] Based on embodiments of this disclosure, an apparatus adapted to control a second user equipment (UE) can be provided. For example, the apparatus may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. For example, the one or more processors may execute instructions to: receive, via a physical secondary link control channel (PSCCH), first secondary link control information (SCI) from a first UE, including scheduling information for a physical secondary link shared channel (PSSCH), wherein the first SCI includes information related to frequency resource allocation, information related to time resource allocation, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS); and receive, via the PSSCH, first auxiliary information from the first UE, wherein the first auxiliary information includes information for secondary link (SL) resource selection for the second UE.

[0271] Based on embodiments of this disclosure, a non-transitory computer-readable storage medium storing instructions can be provided. For example, when executed, the instructions can cause a second device to: receive, via a Physical Sublink Control Channel (PSCCH), first Sublink Control Information (SCI) from a first device, including scheduling information for a Physical Sublink Shared Channel (PSSCH), wherein the first SCI includes information related to frequency resource allocation, information related to time resource allocation, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS); and receive, via the PSSCH, first auxiliary information from the first device, wherein the first auxiliary information includes information for sublink (SL) resource selection for the second device.

[0272] Based on various embodiments of this disclosure, a UE that has received auxiliary information can efficiently (re)select resources for transmission by the UE based on the auxiliary information.

[0273] The various embodiments disclosed herein can be combined with each other.

[0274] In the following, devices to which the respective embodiments of this disclosure may be applied will be described.

[0275] The various descriptions, functions, processes, proposals, methods and / or operating procedures described in this document can be applied to, but are not limited to, various fields requiring wireless communication / connectivity between devices (e.g., 5G).

[0276] The following description will be given in more detail with reference to the accompanying drawings. In the following drawings / description, unless otherwise described, the same reference numerals may denote the same or corresponding hardware blocks, software blocks, or functional blocks.

[0277] Figure 15 A communication system (1) according to an embodiment of the present disclosure is shown.

[0278] Reference Figure 15The communication system (1) applying various embodiments of this disclosure includes a wireless device, a base station (BS), and a network. Hereinafter, 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. Wireless devices may include, but are not limited to, robots (100a), vehicles (100b-1, 100b-2), extended reality (XR) devices (100c), handheld devices (100d), home appliances (100e), Internet of Things (IoT) devices (100f), and artificial intelligence (AI) devices / servers (400). For example, a vehicle may include a vehicle with wireless communication capabilities, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Hereinafter, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices can include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and can take the form of head-up displays (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Handheld devices can include smartphones, smart tablets, wearable devices (e.g., smartwatches or smart glasses) and computers (e.g., laptops). Home appliances can include TVs, refrigerators, and washing machines. IoT devices can include sensors and smart meters. For example, the BS and network can be implemented as wireless devices, and a particular wireless device (200a) can operate as a BS / network node relative to other wireless devices.

[0279] In addition to LTE, NR, and 6G, the wireless communication technologies implemented in the wireless devices 100a to 100f of this disclosure may also include narrowband Internet of Things (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 a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the aforementioned names. Alternatively or additionally, the wireless communication technologies implemented in the wireless devices 100a to 100f of this 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 one of various standards such as 1) LTE Cat 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine-type communication, and / or 7) LTE M, and is not limited to the aforementioned names. Alternatively or additionally, the wireless communication technology implemented in the wireless devices 100a to 100f of this disclosure may include at least one of Bluetooth, Low Power Wide Area Network (LPWAN), and ZigBee, which takes into account low power communication, and is not limited to the names mentioned above. As an example, ZigBee technology may generate personal area networks (PANs) related to low / low power digital communication based on various standards including IEEE 802.15.4, and may be referred to by various names.

[0280] Wireless devices 100a to 100f can connect to network 300 via BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. 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 BS 200 / network 300, wireless devices 100a to 100f can perform direct communication with each other (e.g., secondary link communication) 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.

[0281] Wireless communication / connections 150a, 150b, or 150c can be established between wireless devices 100a to 100f / BS 200 or BS200 / BS 200. Here, the wireless communication / connection can be established via various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, secondary link communication 150b (or D2D communication), or inter-BS communication (e.g., relay, access backhaul integration (IAB)). The wireless devices and BS / wireless devices can transmit / receive radio signals to / from each other via wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b can transmit / receive signals via various physical channels. For this purpose, at least a portion of various configuration information configuration processes, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for transmitting / receiving radio signals can be performed based on various proposals of this disclosure.

[0282] Figure 16 A wireless device according to an embodiment of the present disclosure is shown.

[0283] Reference Figure 16 The first wireless device (100) and the second wireless device (200) can transmit radio signals via various RATs (e.g., LTE and NR). In this document, {the first wireless device (100) and the second wireless device (200)} can correspond to... Figure 15 {Wireless device (100x) and BS (200)} and / or {Wireless device (100x) and Wireless device (100x)}.

[0284] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and / or one or more antennas 108. The processors 102 may control the memories 104 and / or the transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. For example, the processors 102 may process information in the memories 104 to generate a first information / signal, and then transmit a radio signal including the first information / signal via the transceivers 106. The processors 102 may receive a radio signal including a second information / signal via the transceivers 106, and then store the information obtained by processing the second information / signal in the memories 104. The memories 104 may be connected to the processors 102 and may store various information relating to the operation of the processors 102. For example, one or more memories 104 may store software code including commands for performing part or all of the processing controlled by one or more processors 102, or for performing the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. Here, one or more processors 102 and one or more memories 104 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). One or more transceivers 106 may be connected to one or more processors 102 and transmit and / or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. One or more transceivers 106 may be used interchangeably with one or more radio frequency (RF) units. In this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0285] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally include one or more transceivers 206 and / or one or more antennas 208. The processors 202 may control the memories 204 and / or the transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. For example, the processors 202 may process information in the memories 204 to generate a third message / signal, and subsequently transmit a radio signal including the third message / signal via the transceivers 206. The processors 202 may receive a radio signal including a fourth message / signal via the transceivers 106, and then store the information obtained by processing the fourth message / signal in the memories 204. The memories 204 may be connected to the processors 202 and may store various information relating to the operation of the processors 202. For example, one or more memories 204 may store software code including commands for performing part or all of the processing controlled by one or more processors 202, or for performing the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document. Here, one or more processors 202 and one or more memories 204 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). One or more transceivers 206 may be connected to one or more processors 202 and transmit and / or receive radio signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. One or more transceivers 206 may be used interchangeably with one or more RF units. In this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0286] The hardware elements of wireless devices 100 and 200 will now be described in more detail. One or more protocol layers may be implemented, but are not limited to, 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 in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and acquire PDUs, SDUs, messages, control information, data, or information in accordance with the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document.

[0287] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using firmware or software, and such firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to perform the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, thereby being driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0288] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located internally and / or externally to one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0289] One or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels mentioned in the methods and / or operating procedures of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may transmit and receive radio signals. For example, one or more processors 102 and 202 may perform control such that one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control such that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational procedures disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert the processed user data, control information, radio signals / channels, etc., from baseband signals to RF band signals. For this purpose, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0290] Figure 17 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0291] Reference Figure 17 The signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a pre-encoder (1040), a resource mapper (1050), and a signal generator (1060). It can perform... Figure 17 Operations / functions, but not limited to Figure 16 The processors (102, 202) and / or transceivers (106, 206) can be used. Figure 16Implemented by processors (102, 202) and / or transceivers (106, 206) Figure 17 Hardware components. For example, it can be achieved through... Figure 16 The processors (102, 202) implement boxes 1010 to 1060. Alternatively, they can be implemented using... Figure 16 The processors (102, 202) implement boxes 1010 to 1050, and can be used to... Figure 16 The transceivers (106, 206) are used to implement the frame 1060.

[0292] Can be via Figure 17 The signal processing circuit (1000) converts the codewords into radio signals. In this document, a codeword is a sequence of encoded bits for an information block. The information block may include a transport block (e.g., a UL-SCH transport block, a DL-SCH transport block). Radio signals can be transmitted via various physical channels (e.g., PUSCH and PDSCH).

[0293] Specifically, the codeword can be converted into a scrambled bit sequence by scrambler 1010. The scrambling sequence used for scrambling can be generated based on an initial value, which may include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by 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 layer mapper 1030. The modulation symbols of each transmission layer can be mapped (precoded) to one or more corresponding antenna ports by precoder 1040. The output z of precoder 1040 can be obtained by multiplying the output y of layer mapper 1030 by an N*M precoding matrix W. Here, N is the number of antenna ports, and M is the number of transmission layers. Precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) for the complex modulation symbols. Alternatively, the precoder 1040 can perform precoding without performing transform precoding.

[0294] Resource mapper 1050 maps modulation symbols for each antenna port to time-frequency resources. 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. Signal generator 1060 can generate radio signals from the mapped modulation symbols, and the generated radio signals can be transmitted to other devices via each antenna. For this purpose, signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0295] Can be with Figure 17 The signal processing procedures (1010-1060) are configured in the reverse manner for the signal processing procedures used to receive signals in a wireless device. For example, a wireless device (e.g., Figure 16 The receiver (e.g., 100, 200) can receive radio signals from the outside via the antenna port / transceiver. The received radio signals can be converted into baseband signals using a signal recovery unit. For this purpose, the signal recovery unit 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 signals can be recovered into codewords through a resource demapping process, a post-encoding process, a demodulation processor, and a descrambling process. The codewords can be recovered into the original information blocks through decoding. Therefore, the signal processing circuitry (not illustrated) used for receiving signals may include a signal recovery unit, a resource demapping unit, a post-encoder, a demodulator, a descrambler, and a decoder.

[0296] Figure 18 Another example of a wireless device according to an embodiment of this disclosure is shown. The wireless device can be implemented in various forms depending on the use case / service (see reference). Figure 15 ).

[0297] Reference Figure 18 The wireless devices (100, 200) can correspond to Figure 16 The wireless devices (100, 200) can be configured using various elements, components, units / parts, and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and 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 16 One or more processors (102, 202) and / or one or more memories (104, 204). For example, transceiver (114) may include one or more transceivers. Figure 16The device comprises one or more transceivers (106, 206) and / or one or more antennas (108, 208). The control unit (120) is electrically connected to the communication unit (110), memory (130), and add-ons (140), and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on programs / codes / commands / information stored in the memory unit (130). The control unit (120) may transmit information stored in the memory unit (130) to an external location (e.g., another communication device) via the communication unit (110) through a wireless / wired interface, or store information received from an external location (e.g., another communication device) via the communication unit (110) through a wireless / wired interface in the memory unit (130).

[0298] The add-on component (140) can be configured in various ways depending on the type of wireless device. For example, the add-on 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 can be implemented in, but is not limited to, the following forms: robot ( Figure 15 100a), vehicles ( Figure 15 100b-1 and 100b-2), XR device ( Figure 15 100c), handheld device ( Figure 15 100d), home appliances ( Figure 15 100e), IoT devices ( Figure 15 100f), digital broadcasting terminals, holographic devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, AI servers / devices ( Figure 15 400), BS ( Figure 15 (e.g., 200), network nodes, etc. Depending on the use case / service, wireless devices can be used in mobile or fixed locations.

[0299] exist Figure 18In the wireless devices (100, 200), all various elements, components, units / parts, and / or modules can be connected to each other via wired interfaces, or at least partially via communication units (110). For example, in each of the wireless devices (100, 200), the control unit (120) and the communication unit (110) can be connected via a wired connection, and the control unit (120) and the first unit (e.g., 130, 140) can be wirelessly connected via the communication unit (110). Each element, component, unit / part, and / or module within the wireless devices (100, 200) may also include one or more elements. For example, the control unit (120) may be constructed using a collection of one or more processors. As an example, the control unit (120) may be constructed using a collection of communication control processors, application processors, electronic control units (ECUs), graphics processing units, and memory control processors. As another example, memory (130) can be constructed using random access memory (RAM), dynamic RAM (DRAM), read-only memory (ROM), flash memory, volatile memory, non-volatile memory and / or combinations thereof.

[0300] The implementation will be described in detail below with reference to the accompanying drawings. Figure 18 Examples.

[0301] Figure 19 A handheld device according to an embodiment of the present disclosure is illustrated. The handheld device may include a smartphone, smartpad, wearable device (e.g., a smartwatch or smart glasses), or portable computer (e.g., a laptop). The handheld device may be referred to as a mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), advanced mobile station (AMS), or wireless terminal (WT).

[0302] Reference Figure 19 The handheld device (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a memory unit (130), a power supply unit (140a), an interface unit (140b), and an I / O unit (140c). The antenna unit (108) may be configured as part of the communication unit (110). Blocks 110 to 130 / 140a to 140c correspond to respectively Figure 18 The frame is 110 to 130 / 140.

[0303] Communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. Control unit 120 can perform various operations by controlling the constituent elements of handheld device 100. Control unit 120 may include an application processor (AP). Memory unit 130 can store data / parameters / programs / codes / commands required to drive handheld device 100. Memory unit 130 can store input / output data / information. Power supply unit 140a can supply power to handheld device 100 and includes wired / wireless charging circuitry, a battery, etc. Interface unit 140b can support connection of handheld device 100 to other external devices. Interface unit 140b may include various ports for connecting to external devices (e.g., audio I / O ports and video I / O ports). I / O unit 140c can input or output user-input video information / signals, audio information / signals, data, and / or information. I / O unit 140c may include a camera, microphone, user input unit, display unit 140d, speaker, and / or haptic module.

[0304] For example, in the case of data communication, I / O unit 140c can acquire user input information / signals (e.g., touch, text, voice, image, or video), and the acquired information / signals can be stored in memory unit 130. Communication unit 110 can convert the information / signals stored in memory into radio signals and transmit the converted radio signals directly to other wireless devices or to the BS. Communication unit 110 can receive radio signals from other wireless devices or the BS, and then recover the received radio signals into the original information / signals. The recovered information / signals can be stored in memory unit 130 and can be output in various types (e.g., text, voice, image, video, or haptic feedback) through I / O unit 140.

[0305] Figure 20 A vehicle or autonomous vehicle according to an embodiment of this disclosure is shown. The vehicle or autonomous vehicle can be implemented by mobile robots, cars, trains, manned / unmanned aerial vehicles (AVs), ships, etc.

[0306] Reference Figure 20 The vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a drive unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) may be configured as part of the communication unit (110). Boxes 110 / 130 / 140a to 140d correspond to respectively Figure 18 The frame size is 110 / 130 / 140.

[0307] Communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BS (e.g., gNB and roadside units), and servers. Control unit 120 can perform various operations by controlling elements of the vehicle or autonomous vehicle 100. Control unit 120 may include electronic control unit (ECU). Drive unit 140a can cause the vehicle or autonomous vehicle 100 to move on the road. Drive unit 140a may include engine, motor, transmission system, wheels, brakes, steering mechanism, etc. Power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and may include wired / wireless charging circuitry, battery, etc. Sensor unit 140c can acquire vehicle status, external environment information, user information, etc. Sensor unit 140c may include inertial measurement unit (IMU) sensors, collision sensors, wheel sensors, speed sensors, slope sensors, weight sensors, heading sensors, position modules, vehicle forward / reverse sensors, battery sensors, fuel sensors, tire sensors, steering sensors, temperature sensors, humidity sensors, ultrasonic sensors, lighting sensors, pedal position sensors, etc. Autonomous driving unit 140d can implement technologies for maintaining the vehicle's lane, technologies for automatically adjusting speed (e.g., adaptive cruise control), technologies for autonomously driving along a defined path, and technologies for automatically setting a route when a destination is set, etc.

[0308] For example, communication unit 110 can receive map data, traffic information data, etc., from an external server. Autonomous driving unit 140d can generate autonomous driving paths and driving plans from the acquired data. Control unit 120 can control drive unit 140a, enabling the vehicle or autonomous vehicle 100 to move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, communication unit 110 can periodically or non-periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from neighboring vehicles. During autonomous driving, sensor unit 140c can acquire vehicle status and / or surrounding environment information. Autonomous driving unit 140d can update the autonomous driving path and driving plan based on newly acquired data / information. Communication unit 110 can transmit information about vehicle location, autonomous driving path, and / or driving plan to an external server. The external server can predict traffic information data using AI technology, etc., based on information collected from the vehicle or autonomous vehicle, and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0309] The claims in this specification can be combined in various ways. For example, technical features in the method claims of this specification can be combined to implement or perform in a device, and technical features in the device claims can be combined to implement or perform in a method. Additionally, technical features in one or more method claims and one or more device claims can be combined to implement or perform in a device.

Claims

1. A method for wireless communications performed by a first apparatus, comprising: transmitting, to a second apparatus, first sidelink control information (SCI) including scheduling information for a physical sidelink shared channel (PSSCH) over a physical sidelink control channel (PSCCH), wherein the first SCI includes information related to a frequency resource assignment, information related to a time resource assignment, information related to a demodulation reference signal (DMRS) pattern, and information related to a modulation and coding scheme (MCS); and transmitting, to the second apparatus, assistance information over the PSSCH, the assistance information including a plurality of time resource indicator values (TRIVs), a plurality of frequency resource indicator values (FRIVs), and information related to a reference time location, wherein the information related to the reference time location includes a first direct frame number (DFN) index and a first slot index, and wherein the assistance information is information for sidelink (SL) resource selection by the second apparatus.

2. The method of claim 1, wherein, a reference time location of each of the plurality of TRIVs is the same as the reference time location.

3. The method of claim 1, wherein, the reference time location is a slot, among a plurality of slots within a frame determined by the first DFN index, determined by the first slot index.

4. The method of claim 1, wherein, the assistance information includes information related to a logical slot offset.

5. The method of claim 4, wherein, an initial resource location of each of the plurality of TRIVs is determined based on the reference time location or the logical slot offset.

6. The method of claim 1, wherein, the plurality of TRIVs, the plurality of FRIVs, and the information related to the reference time location are information for a non-preferred resource set.

7. The method of claim 6, wherein, a resource is included in the non-preferred resource set based on a reference signal received power (RSRP) measurement value related to the resource exceeding an RSRP threshold.

8. The method of claim 7, wherein, the RSRP threshold is determined based on a reception priority.

9. The method of claim 8, wherein, a transmission priority is not considered in determining the RSRP threshold. 10.The method of claim 1, further comprising: receiving, from the second apparatus, information for requesting assistance information, wherein the information for requesting the assistance information includes information related to a resource selection window location.

11. The method of claim 10, wherein, the information related to the resource selection window location includes information related to a start time location and an end time location of the resource selection window, and wherein the start time location of the resource selection window is represented by a second DFN index and a second slot index.

12. The method of claim 11, wherein, the start time location of the resource selection window is a slot, among a plurality of slots in a frame determined by the second DFN index, determined by the second slot index.

13. The method of claim 10, wherein, the assistance information is generated based on the information related to the resource selection window included in the information for requesting the assistance information. 14.An apparatus adapted to perform wireless communications, comprising: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations including: transmit, to a second device, first sidelink control information, SCI, including scheduling information for a physical sidelink shared channel, PSSCH, over a physical sidelink control channel, PSCCH, wherein the first SCI includes information related to a frequency resource assignment, information related to a time resource assignment, information related to a demodulation reference signal, DMRS, pattern, and information related to a modulation and coding scheme, MCS; and transmit, to the second device, assistance information over the PSSCH, the assistance information including a plurality of time resource indicator values, TRIVs, a plurality of frequency resource indicator values, FRIVs, and information related to a reference time location, wherein the information related to the reference time location includes a first direct frame number, DFN, index and a first slot index, and wherein the assistance information is information for sidelink, SL, resource selection by the second device.

15. A processing device adapted to control a first device, the processing device comprising: at least one processor; and at least one memory connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations including: transmit, to a second device, first sidelink control information, SCI, including scheduling information for a physical sidelink shared channel, PSSCH, over a physical sidelink control channel, PSCCH, wherein the first SCI includes information related to a frequency resource assignment, information related to a time resource assignment, information related to a demodulation reference signal, DMRS, pattern, and information related to a modulation and coding scheme, MCS; and transmit, to the second device, assistance information over the PSSCH, the assistance information including a plurality of time resource indicator values, TRIVs, a plurality of frequency resource indicator values, FRIVs, and information related to a reference time location, wherein the information related to the reference time location includes a first direct frame number, DFN, index and a first slot index, and wherein the assistance information is information for sidelink, SL, resource selection by the second device.

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