Method and apparatus for power saving in nr v2x

Abstract

A method for a first device to perform wireless communication and an apparatus for supporting the method are provided. The method includes the steps of determining a selection window, selecting Y candidate slots within the selection window, determining at least one slot related to the Y candidate slots based on a resource reservation period value set for a resource pool, selecting at least one sidelink (SL) resource from among SL resources included in the Y candidate slots based on sensing the at least one slot, and performing SL communication based on the at least one SL resource, where a value of Y can be a positive integer.

Description

TECHNICAL FIELD

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

[0002] A sidelink (SL) communication is a communication scheme in which direct links are 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 in 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 enhanced with respect to a conventional radio access technology (RAT). Therefore, communication system design considering reliability and latency sensitive UEs or services 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 before NR. Figure 1 Embodiments of can be combined with various embodiments of the disclosure.

[0005] With respect to V2X communication, when a RAT used before NR is discussed, a scheme focusing on 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 highlighted. 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 NR. For example, the various V2X scenarios can include platooning, advanced driving, extended sensors, remote driving, etc. SUMMARY

[0007] TECHNICAL PROBLEM

[0008] In addition, in NR V2X, partial sensing or no sensing can be supported. The partial sensing or no sensing can obtain power saving gain compared to full sensing, but can cause resource collision between UEs. Therefore, there is a need to propose a method for maximizing power saving gain while minimizing resource collision and a device supporting the method.

[0009] Technical Solution

[0010] In one embodiment, a method of performing wireless communication by a first device is provided. The method can include determining a selection window, selecting Y candidate slots within the selection window, determining at least one slot related to the Y candidate slots based on a resource reservation period value configured for a resource pool, selecting at least one sidelink (SL) resource from among SL resources included in the Y candidate slots based on sensing for the at least one slot, and performing SL communication based on the at least one SL resource, where a value of Y is a positive integer.

[0011] In one embodiment, a first device configured 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. The one or more processors can execute the instructions to determine a selection window, select Y candidate slots within the selection window, determine at least one slot related to the Y candidate slots based on a resource reservation period value configured for a resource pool, select at least one sidelink (SL) resource from among SL resources included in the Y candidate slots based on sensing for the at least one slot, and perform SL communication based on the at least one SL resource, where a value of Y is a positive integer.

[0012] Effects of Invention

[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 according to an embodiment of the disclosure is illustrated.

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

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

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

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

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

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

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

[0023] Figure 10 A resource unit for CBR measurement based on an embodiment of this disclosure is shown.

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

[0025] Figure 12 and Figure 13 A method for determining the time slots for sensing based on a UE according to an embodiment of the present disclosure is shown.

[0026] Figure 14 A method for a UE to sense N time slots based on a first time slot among selectable candidate time slots, based on an embodiment of the present disclosure, is shown.

[0027] Figure 15 A method for performing wireless communication based on an embodiment of the present disclosure is shown.

[0028] Figure 16 A method for performing wireless communication based on an embodiment of the present disclosure is shown.

[0029] Figure 17 A communication system 1 based on an embodiment of the present disclosure is shown.

[0030] Figure 18 A wireless device based on an embodiment of the present disclosure is shown.

[0031] Figure 19A signal processing circuit for transmitting a signal based on an embodiment of the disclosure is shown.

[0032] Figure 20 Another example of a wireless device based on an embodiment of the disclosure is shown.

[0033] Figure 21 A handheld device based on an embodiment of the disclosure is shown.

[0034] Figure 22 A vehicle or autonomous vehicle based on an embodiment of the disclosure is shown. DETAILED DESCRIPTION

[0035] 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".

[0036] 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".

[0037] 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".

[0038] 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".

[0039] 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 "PDCCH" 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".

[0040] The technical features described in each of the drawings in the disclosure can be implemented separately or can be implemented simultaneously.

[0041] 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 by such a radio technology as universal terrestrial radio access (UTRA) or CDMA-2000. The TDMA can be implemented by such a radio technology as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). The OFDMA can be implemented by such a radio technology 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 the system based on the IEEE 802.16e. The UTRA is a part of a universal mobile telecommunications system (UMTS). A 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.

[0042] 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.

[0043] 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.

[0044] Figure 2 The structure of the NR system according to the embodiments of the disclosure is shown. Figure 2 The embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0045] 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 BSs 20 can include next generation NodeBs (gNBs) and / or evolved NodeBs (eNBs). 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 BSs can be referred to as fixed stations that communicate to the UE 10 and can be referred to as other terminology such as a base transceiver system (BTS), access point (AP), etc.

[0046] Figure 2 Embodiments of FIG. 1 illustrate 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.

[0047] 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.

[0048] Figure 3 FIG. 1 illustrates a radio protocol architecture based on embodiments of the disclosure. Figure 3 Embodiments of FIG. 1 can be combined with various embodiments of the disclosure. Specifically, Figure 3 (a) of FIG. 1 illustrates a radio protocol stack for a user plane for Uu communication, and Figure 3 (b) of FIG. 1 illustrates a radio protocol stack for a control plane for Uu communication. Figure 3 (c) of FIG. 1 illustrates a radio protocol stack for a user plane for SL communication, and Figure 3 (d) of FIG. 1 illustrates a radio protocol stack for a control plane for SL communication.

[0049] 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, by a transport channel. Data is transported between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how and what data are transmitted through a radio interface.

[0050] Data is transmitted through a physical channel between different physical layers, i.e., a PHY layer of a transmitter and a PHY layer of a receiver. The physical channel can be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as a radio resource.

[0051] 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.

[0052] 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 Service (QoS) required by a radio bearer (RB), the RLC layer provides three types of operational mode, i.e., a Transparent Mode (TM), an Unacknowledged Mode (UM), and an Acknowledged Mode (AM). The AM RLC provides error correction through an Automatic Repeat reQuest (ARQ).

[0053] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer is used for the control of 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 the delivery of data between the UE and the network.

[0054] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include delivery of user data, header compression, and ciphering. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include delivery of control plane data and ciphering / integrity protection.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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 other user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service can be transmitted, via a 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 other user traffic or control messages.

[0059] Examples of a logical channel mapped to a transport channel belonging to a higher layer than the transport channel can include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a multicast traffic channel (MTCH).

[0060] Figure 4 The structure of a radio frame of the NR according to an embodiment of the disclosure is shown. Figure 4 Embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0061] 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).

[0062] 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).

[0063] Table 1 shown below represents the number of symbols (N slot symb ) per slot, the number of slots (N frame,u slot ) per frame, and the number of slots (N subframe,u slot ) per subframe according to SCS configuration (u) in case of using normal CP.

[0064] [Table 1]

[0065]

[0066]

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

[0068] [Table 2]

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

[0070] 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) (for simplicity, collectively referred to as time unit (TU)) composed of the same number of symbols can be configured differently in the integrated cells.

[0071] In the NR, a plurality of numerologies or SCSs for supporting various 5G services can be supported. For example, in case of SCS of 15 kHz, a wide range of legacy cellular bands can be supported, and in case of SCS of 30 kHz / 60 kHz, dense urban, lower latency, wider carrier bandwidths can be supported. In case of SCS of 60 kHz or more, in order to overcome phase noise, a bandwidth greater than 24.25 GHz can be used.

[0072] 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 millimeter wave (mmW).

[0073] [Table 3]

[0074]

[0075] 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).

[0076] [Table 4]

[0077]

[0078] 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.

[0079] Referring to 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.

[0080] 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.

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

[0082] A BWP can be a contiguous set of physical resource blocks (PRBs) within a given numerology. A PRB can be selected from a contiguous set of common resource blocks (CRBs) for a given numerology on a given carrier.

[0083] 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.

[0084] 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.

[0085] 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 an embodiment of the disclosure, the number of BWPs is 3.

[0086] 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.

[0087] 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.

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

[0089] 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.

[0090] 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 an 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 an 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 24-bit cyclic redundancy check (CRC) in NR V2X.

[0091] The S-PSS, the S-SSS, and the PSBCH can support a block format (e.g., a SL synchronization signal (SS) / PSBCH block, hereinafter, a sidelink synchronization signal block (S-SSB)) that is periodically transmitted is included. 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, a UE does not have to perform hypothesis detection at a frequency to discover the S-SSB in a carrier.

[0092] Figure 7 A UE performing V2X or SL communication according to an embodiment of the disclosure is illustrated. Figure 7 Embodiments thereof can be combined with various embodiments of the disclosure.

[0093] Reference Signs 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.

[0094] 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.

[0095] 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.

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

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

[0098] 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.

[0099] 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,

[0100] 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,

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

[0102] Referring to Figure 8 (b) in the 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 the 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, the sensing can be performed in units of sub-channels. In addition, the UE 1 that has autonomously selected resources in the resource pool can transmit SCI to the UE 2 through a PSCCH, and thereafter can transmit data based on the SCI to the UE 2 through a PSSCH.

[0103] For example, a UE can assist SL resource selection for another UE. For example, in the NR resource allocation mode 2, a UE can be provided / allocated a configured grant for SL transmission. For example, in the NR resource allocation mode 2, a UE can schedule SL transmission of another UE. For example, in the NR resource allocation mode 2, a UE can reserve SL resources for blind retransmission.

[0104] For example, in NR resource allocation mode 2, UE 1 can use SCI to indicate a priority of a SL transmission to UE 2. For example, UE 2 can decode the SCI, and UE 2 can perform sensing and / or resource (re)selection based on the priority. For example, the resource (re)selection procedure can include a step of UE 2 identifying candidate resources in a resource selection window and a step of UE 2 selecting a resource for (re)transmission among the identified candidate resources. For example, the resource selection window can be a time interval for selecting a resource for a SL transmission of a UE. For example, after UE 2 triggers the resource (re)selection, the resource selection window can start at T1≥ 0, and the resource selection window can be limited by a remaining packet delay budget of UE 2. For example, in the step of UE 2 identifying candidate resources in the resource selection window, UE 2 can not determine a particular resource as a candidate resource if the particular resource is indicated by SCI received by UE 2 from UE 1, and if a L1 SL RSRP threshold for the particular resource exceeds a SL RSRP threshold. For example, the SL RSRP threshold can be determined based on the priority of the SL transmission indicated by the SCI received by UE 2 from UE 1 and the priority of the SL transmission on the resource selected by UE 2.

[0105] For example, the L1 SL RSRP can be measured based on a SL demodulation reference signal (DMRS). For example, one or more PSSCH DMRS patterns can be configured or pre-configured in time domain for each resource pool. For example, PDSCH DMRS configuration type 1 and / or type 2 can be the same or similar as a frequency domain pattern of PSSCH DMRS. For example, a correct DMRS pattern can be indicated by SCI. For example, in NR resource allocation mode 2, a transmitting UE can select a particular DMRS pattern from the configured or pre-configured DMRS patterns for a resource pool.

[0106] For example, in NR resource allocation mode 2, a transmitting UE can perform an initial transmission of a transport block (TB) without reservation based on a sensing and resource (re)selection procedure. For example, the transmitting UE can reserve SL resources for an initial transmission of a second TB based on the sensing and resource (re)selection procedure using SCI related to a first / initial RB.

[0107] For example, in NR resource allocation mode 2, a UE can reserve resources for feedback-based PSSCH retransmissions via signaling associated with previous transmissions of the same TB. For example, the maximum number of SL resources reserved by a transmission including the current transmission can be 2, 3, or 4. For example, the maximum number of SL resources can be the same regardless of whether HARQ feedback is enabled. For example, the maximum number of HARQ (re)transmissions for a TB can be limited by configuration or pre-configuration. For example, the maximum number of HARQ (re)transmissions can be up to 32. For example, the maximum number of HARQ (re)transmissions can be left unspecified without configuration or pre-configuration. For example, configuration or pre-configuration can be specific to the sending UE. For example, in NR resource allocation mode 2, HARQ feedback for releasing unused resources by the UE can be supported.

[0108] For example, in NR resource allocation mode 2, a UE can use SCI to indicate to another UE the one or more sub-channels and / or time slots it uses. For example, a UE can use SCI to indicate to another UE the one or more sub-channels and / or time slots it has reserved for PSSCH (re)transmission. For example, the smallest allocation unit for SL resources can be a time slot. For example, the size of a sub-channel can be configured for the UE or can be pre-configured.

[0109] Figure 9 Three broadcast types according to embodiments of this disclosure are shown. Figure 9 The implementation methods can be combined with various implementation methods of this disclosure. Specifically, Figure 9 (a) in the diagram illustrates broadcast SL communication. Figure 9 (b) shows unicast SL communication, and Figure 9 (c) illustrates multicast SL communication. In the case of unicast SL communication, a UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, a UE can perform SL communication with one or more UEs in a group to which it belongs. In various embodiments of this disclosure, SL multicast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0110] The following section will describe side link (SL) congestion control.

[0111] If the UE autonomously determines the SL transmission resources, it also autonomously determines the size and frequency of the resources available for its use. Of course, due to constraints from the network and other factors, the size or frequency of resources used can be limited to a certain level. However, if many UEs are concentrated in a specific area at a specific time and all UEs use a relatively large amount of resources, overall performance will be significantly degraded due to mutual interference.

[0112] Accordingly, the UE can need to observe a channel situation. If it is determined that an excessive amount of resources is consumed, it is preferable that the UE autonomously reduce the use of resources. In the present disclosure, this can be defined as congestion control (CR). For example, the UE can determine whether the energy measured in a unit time / frequency resource is greater than or equal to a certain level, and can adjust the amount and frequency of use of transmission resources thereof based on the ratio of unit time / frequency resources in which energy greater than or equal to a certain level is observed. In the present disclosure, the ratio of time / frequency resources in which 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 a channel / frequency. In addition, the UE can transmit the measured CBR to the network / BS.

[0113] Figure 10 A resource unit for CBR measurement based on an embodiment of the present disclosure is illustrated. Figure 10 Embodiments thereof can be combined with various embodiments of the present disclosure.

[0114] Referring to Figure 10 , as a result of the UE measuring an RSSI based on a subchannel for a certain period (e.g., 100 ms), the CBR can indicate the number of subchannels in which a received signal strength indicator (RSSI) measurement value has a value greater than or equal to a preconfigured threshold value. Alternatively, the CBR can indicate the ratio of subchannels having a value greater than or equal to a preconfigured threshold value among subchannels for a certain duration. For example, in an embodiment of the present disclosure, if it is assumed that a hatched subchannel is a subchannel having a value greater than or equal to a preconfigured threshold value, the CBR can indicate the ratio of hatched subchannels for a 100 ms period. In addition, the CBR can be reported to the BS. Figure 10

[0115] In addition, congestion control considering the priority of traffic (e.g., packets) can be necessary. To this end, for example, the UE can measure a channel occupancy ratio (CR). Specifically, the UE can measure the CBR, and the UE can determine a maximum value CRlimitkof 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 a maximum value CRlimitkof a channel occupancy ratio 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 a channel occupancy ratio. Thereafter, the UE can perform congestion control by limiting the sum of 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 of a relatively low priority, the channel occupancy ratio can be more strictly limited.

[0116] ​In addition to this, the UE can perform SL congestion control by using adjusting transmit power level, dropping packets, determining whether retransmission will be performed or not, adjusting transmit RB size (MCS coordination), etc.

[0117] Hereinafter, a hybrid automatic repeat request (HARQ) procedure will be described.

[0118] In the case of SL unicast and groupcast, HARQ feedback and HARQ combining in the physical layer can be supported. For example, in the case that 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 over a Physical Sidelink Feedback Channel (PSFCH).

[0119] For example, SL HARQ feedback can be enabled for unicast. In this case, in non-code block group (non-CBG) operation, a receiving UE can decode a PSCCH targeted to 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 to the receiving UE, if the receiving UE fails to 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.

[0120] For example, SL HARQ feedback can be enabled for groupcast. For example, during non-CBG, two different types of HARQ feedback options can be supported for groupcast.

[0121] (1) Groupcast Option 1: After decoding a PSCCH targeted to the receiving UE, if the receiving UE fails to decode a transport block related to the PSCCH, the receiving UE can transmit a HARQ-NACK to the transmitting UE via a PSFCH. In contrast, when the receiving UE decodes the PSCCH targeted to the receiving UE, and when the receiving UE successfully decodes the transport block related to the PSCCH, the receiving UE does not transmit a HARQ-ACK to the transmitting UE.

[0122] (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 the 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 the PSFCH.

[0123] For example, if Multicast Option 1 is used in SL HARQ feedback, all UEs performing multicast communication can share the PSFCH resource. For example, UEs belonging to the same group can transmit HARQ feedback by using the same PSFCH resource.

[0124] For example, if Multicast Option 2 is used in SL HARQ feedback, each UE performing multicast communication can use a different PSFCH resource for HARQ feedback transmission. For example, UEs belonging to the same group can transmit HARQ feedback by using different PSFCH resources.

[0125] 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 RSRP.

[0126] For example, in Multicast Option 1, in the case of TX-RX distance-based HARQ feedback, if the TX-RX distance is less than or equal to a communication range requirement, the receiving UE can send HARQ feedback in response to the PSSCH to the transmitting UE. Otherwise, if the TX-RX distance is greater than the communication range requirement, the receiving UE can not send 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 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.

[0127] For example, in case of resource allocation mode 1, a time (offset) between PSFCH and PSSCH can be configured or pre-configured. In case of unicast and groupcast, if retransmission must be made on SL, it can be indicated by a UE in coverage of a PUCCH to a BS. The transmitting UE can transmit the indication to a serving BS of the transmitting UE in a form of a scheduling request (SR) / buffer status report (BSR) rather than a form of HARQ ACK / NACK. In addition, even if the BS does not receive the indication, the BS can schedule SL retransmission resources for the UE. For example, in case of resource allocation mode 2, a time (offset) between PSFCH and PSSCH can be configured or pre-configured.

[0128] For example, from a perspective of a UE transmitting in a carrier, for a PSFCH format for SL in a slot, TDM between PSCCH / PSSCH and 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 an AGC duration. For example, the sequence-based PSFCH format can apply to unicast and groupcast.

[0129] For example, in a slot related to a resource pool, PSFCH resources can be periodically configured for 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, HARQ feedback for transmission in a specific resource pool can be transmitted through PSFCH only on the specific resource pool.

[0130] For example, if a transmitting UE transmits a PSSCH to a receiving UE across slot #X to slot #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 PSFCH resources. 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.

[0131] For example, if the receiving UE sends a HARQ feedback on a PSFCH resource in response to a PSSCH sent to the receiving UE by the sending UE, the receiving UE can determine the frequency domain and / or code domain of the PSFCH resource based on implicit mechanisms in the 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 the slot index associated with the PSCCH / PSSCH / PSFCH, the sub-channel associated with the PSCCH / PSSCH, or the identifier of each receiving UE in the group used to identify HARQ feedback based on multicast option 2. Alternatively / in addition, for example, the receiving UE can determine the frequency domain and / or code domain of the PSFCH resource based on at least one of SL RSRP, SINR, L1 source ID, and / or location information.

[0132] For example, if HARQ feedback transmission via the UE's PSFCH overlaps with HARQ feedback reception via the PSFCH, the UE can select either HARQ feedback transmission via the PSFCH or HARQ feedback reception via the PSFCH based on priority rules. For example, the priority rules can be based at least on the priority indication of the relevant PSCCH / PSSCH.

[0133] For example, if HARQ feedback transmissions via PSFCH overlap for multiple UEs, the UE can select a specific HARQ feedback transmission based on priority rules. For instance, the priority rules could be based on the lowest priority indication of the relevant PSCCH / PSSCH.

[0134] Furthermore, in this disclosure, the transmitting UE (i.e., TX UE) can be a UE that transmits data to the (target) receiving UE (i.e., RX UE). For example, the TX UE can be a UE that performs PSCCH transmission and / or PSSCH transmission. For example, the TX UE can be a UE that sends SL CSI-RS and / or SL CSI report request indications to the (target) RX UE. For example, the TX UE can be a UE that sends (predefined) reference signals (e.g., PSSCH demodulation reference signals (DM-RS)) and / or SL(L1) RSRP report request indications (which are used for SL(L1) RSRP measurements) to the (target) RX UE. For example, the TX UE can be a UE that transmits (control) channels (e.g., PSCCH, PSSCH, etc.) and / or reference signals through (control) channels (e.g., DM-RS, CSI-RS, etc.) (which are used for the (target) RX UE's SL radio link monitoring (RLM) operation and / or SL radio link failure (RLF) operation).

[0135] Further, in the disclosure, a receiving UE (i.e., RX UE) can be a UE that transmits SL HARQ feedback to a transmitting UE (i.e., TX UE) based on whether decoding of data transmitted by the TX UE is successful and / or whether detection / decoding of PSCCH (related to PSSCH scheduling) transmitted by the TX UE is successful. For example, the RX UE can be a UE that performs SL CSI transmission to the TX UE based on SL CSI-RS and / or SL CSI report request indication received from the TX UE. For example, the RX UE can be a UE that transmits SL (L1) RSRP measurement value based on (predefined) reference signal received from the TX UE and / or SL (L1) RSRP report request indication to the TX UE. For example, the RX UE can be a UE that transmits its own data to the TX UE. For example, the RX UE can be a UE that performs SL RLM operation and / or SL RLF operation based on (preconfigured) (control) channel and / or reference signal through the (control) channel received from the TX UE.

[0136] Further, in the disclosure, the TX UE can transmit all or part of the following information to the RX UE through SCI. In this document, for example, the TX UE can transmit all or part of the following information to the RX UE through the first SCI and / or the second SCI.

[0137] - PSSCH (and / or PSCCH) related resource allocation information (e.g., number / location of time / frequency resources, resource reservation information (e.g., periodicity))

[0138] - SL CSI report request indicator or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) report request indicator

[0139] - SL CSI transmission indicator (or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) information transmission indicator)) (on PSSCH)

[0140] - Modulation and coding scheme (MCS) information

[0141] - Transmission power information

[0142] - L1 destination ID information and / or L1 source ID information

[0143] - SL HARQ process ID information

[0144] - New data indicator (NDI) information

[0145] - Redundancy version (RV) information

[0146] - QoS information (e.g., priority information) related to (transmitted service / packet)

[0147] - information on the number of SL CSI-RS antenna ports (to be transmitted) or SL CSI-RS transmission indicator

[0148] - location (or distance range) information of the target RX UE (for which SL HARQ feedback is requested) or TX UE location information

[0149] - reference signal (e.g., DM-RS, etc.) information related to decoding and / or channel estimation of data to be transmitted through PSSCH. For example, the reference signal information can be information related to the pattern of (time-frequency) mapping resources of the DM-RS, rank information, antenna port index information, information on the number of antenna ports, etc.

[0150] In addition, in the present disclosure, for example, PSCCH can be replaced / replaced with at least one of SCI, first SCI (first level SCI), and / or second SCI (second level SCI), or vice versa. For example, SCI can be replaced / replaced with at least one of PSCCH, first SCI, and / or second SCI, or vice versa. For example, PSSCH can be replaced / replaced with second SCI and / or PSCCH, or vice versa.

[0151] In addition, in the present disclosure, for example, if the SCI configuration field is divided into two groups in consideration of a (relatively) high SCI payload size, the SCI including the first SCI configuration field group can be referred to as first SCI or first level SCI, and the SCI including the second SCI configuration field group can be referred to as second SCI or second level SCI. For example, the first SCI and the second SCI can be transmitted through different channels. For example, the transmitting UE can transmit the first SCI to the receiving UE through the PSCCH. 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 the PSSCH.

[0152] In addition, in the present disclosure, for example, "configuration" or "definition" can mean (pre-) configuration from a base station or network. For example, "configuration" or "definition" can mean resource pool-specific (pre-) configuration from a base station or network. For example, the base station or network can transmit information related to "configuration" or "definition" to the UE. For example, the base station or network can transmit information related to "configuration" or "definition" to the UE through pre-defined signaling. For example, the pre-defined signaling can include at least one of RRC signaling, MAC signaling, PHY signaling, and / or SIB.

[0153] Also, in the disclosure, for example, "configuring" or "defining" can refer to specifying or configuring through pre-configuration signaling between UEs. For example, information related to "configuring" or "defining" can be transmitted or received between UEs through pre-configuration signaling. For example, the pre-configuration signaling can include at least one of RRC signaling, MAC signaling, PHY signaling, and / or SIB.

[0154] Also, in the disclosure, for example, RLF can be replaced / alternated with out-of-sync (OOS) and / or in-sync (IS), or vice versa.

[0155] Also, in the disclosure, for example, a resource block (RB) can be replaced / alternated with a subcarrier, or vice versa. For example, a packet or traffic can be replaced / alternated with a transport block (TB) or a medium access control protocol data unit (MAC PDU) according to a transmission layer, or vice versa. For example, a code block group (CBG) can be replaced / alternated with a TB, or vice versa. For example, a source ID can be replaced / alternated with a destination ID, or vice versa. For example, an L1 ID can be replaced / alternated with an L2 ID, or vice versa. 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.

[0156] Also, in the disclosure, for example, the operation of the TX UE reserving / selecting / determining a retransmission resource can include the operation of the TX UE reserving / selecting / determining a potential retransmission resource in which whether to actually use is determined based on SL HARQ feedback information received from the RX UE.

[0157] Also, in the disclosure, a sub-selection window can be replaced / alternated with a selection window and / or a pre-configured number of resource sets within the selection window, or vice versa.

[0158] Also, in the disclosure, SL mode 1 can refer to a resource allocation method or a communication method in which a base station directly schedules a SL transmission resource for a TX UE through pre-defined signaling (e.g., DCI or RRC message). For example, SL mode 2 can refer to a resource allocation method or a communication method in which a UE independently selects a SL transmission resource in a resource pool pre-configured or configured from a base station or a network. For example, a UE performing SL communication based on SL mode 1 can be referred to as a mode 1 UE or a mode 1 TX UE, and a UE performing SL communication based on SL mode 2 can be referred to as a mode 2 UE or a mode 2 TX UE.

[0159] Also, in the disclosure, for example, a dynamic grant (DG) can be replaced / alternated with a configured grant (CG) and / or a semi-persistent scheduling (SPS) grant, or vice versa. For example, a DG can be replaced / alternated with a combination of a CG and an SPS grant, or vice versa. For example, a CG can include at least one of a configured grant (CG) Type 1 and / or a configured grant (CG) Type 2. For example, in the CG Type 1, a grant can be provided through RRC signaling and can be stored as a configured grant. For example, in the CG Type 2, a grant can be provided through a PDCCH, and can be stored or deleted as a configured grant based on L1 signaling indicating activation or deactivation of the grant. For example, in the CG Type 1, a base station can allocate a periodic resource to a TX UE through an RRC message. For example, in the CG Type 2, a base station can allocate a periodic resource to a TX UE through an RRC message, and the base station can dynamically activate or deactivate the periodic resource through a DCI.

[0160] Also, in the disclosure, a channel can be replaced / alternated with a signal, or vice versa. For example, transmission / reception of a channel can include transmission / reception of a signal. For example, transmission / reception of a signal can include transmission / reception of a channel. For example, a broadcast can be replaced / alternated with at least one of unicast, groupcast, and / or broadcast, or vice versa. For example, a broadcast type can be replaced / alternated with at least one of unicast, groupcast, and / or broadcast, or vice versa. For example, a broadcast or a broadcast type can include unicast, groupcast, and / or broadcast.

[0161] Also, in the disclosure, a resource can be replaced / alternated with a slot or a symbol, or vice versa. For example, a resource can include a slot and / or a symbol.

[0162] Also, in the disclosure, a priority can be replaced / alternated with at least one of logical channel prioritization (LCP), latency, reliability, minimum required communication range, ProSe per-packet priority (PPPP), sidelink radio bearer (SLRB), a QoS profile, a QoS parameter, and / or requirement, or vice versa.

[0163] Also, in the disclosure, for example, for convenience of description, a (physical) channel used when a RX UE transmits at least one of the following information to a TX UE can be referred to as a PSFCH.

[0164] -SL HARQ feedback, SL CSI, SL (L1) RSRP

[0165] Further, in the disclosure, a Uu channel can include an UL channel and / or a DL channel. For example, the UL channel can include a PUSCH, a PUCCH, a sounding reference signal (SRS), and / or the like. For example, the DL channel can include a PDCCH, a PDSCH, a PSS / SSS, and / or the like. For example, the SL channel can include a PSCCH, a PSSCH, a PSFCH, a PSBCH, a PSSS / SSSS, and / or the like.

[0166] Further, in the disclosure, sidelink information can include at least one of a sidelink message, a sidelink packet, a sidelink service, sidelink data, sidelink control information, and / or a sidelink transport block (TB). For example, the sidelink information can be transmitted through a PSSCH and / or a PSCCH.

[0167] Further, in the disclosure, a high priority can mean a small priority value, and a low priority can mean a large priority value. For example, Table 5 shows an example of a priority.

[0168] [Table 5]

[0169] Service or logical channel Priority value Service A or logical channel A 1 Service B or logical channel B 2 Service C or logical channel C 3

[0170] Referring to Table 5, for example, a service A or a logical channel A related to a minimum priority value can have a highest priority. For example, a service C or a logical channel C related to a maximum priority value can have a lowest priority.

[0171] Further, in NR V2X communication or NR sidelink communication, a transmitting UE can reserve / choose one or more transmission resources for sidelink transmission (e.g., initial transmission and / or retransmission), and the transmitting UE can transmit information about a location of the one or more transmission resources to a receiving UE.

[0172] Further, when performing sidelink communication, a method in which a transmitting UE reserves or determines a transmission resource for a receiving UE can be representatively as follows.

[0173] For example, the transmitting UE can perform the reservation of the transmission resources based on the chain. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE can transmit the location information of less than K transmission resources to the receiving UE through the SCI transmitted to the receiving UE at any (or specific) transmission time or time resource. That is, for example, the SCI can include the location information of less than K transmission resources. Alternatively, for example, if the transmitting UE reserves K transmission resources related to a specific TB, the transmitting UE can transmit the location information of less than K transmission resources to the receiving UE through the SCI transmitted to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI can include the location information of less than K transmission resources. In this case, for example, by signaling the location information of less than K transmission resources to the receiving UE via only one SCI transmitted by the transmitting UE at any (or specific) transmission time or time resource, performance degradation due to an excessive increase in the payload of the SCI can be prevented.

[0174] Figure 11 A method in which a UE having transmission resources reserved based on an embodiment of the disclosure informs another UE of the transmission resources is shown. Figure 11 Embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0175] Specifically, for example, Figure 11 (a) of FIG. 1 shows a method in which a transmitting UE performs chain-based resource reservation by transmitting / signaling the location information of (max) 2 transmission resources to a receiving UE via one SCI in the case where the value K = 4. For example, referring to Figure 11 (b) of FIG. 1 shows a method in which a transmitting UE performs chain-based resource reservation by transmitting / signaling the location information of (max) 3 transmission resources to a receiving UE via one SCI in the case where the value K = 4. For example, referring to Figure 11 (a) and (b) of FIG. 1, the transmitting UE can transmit / signaling the location information of only the fourth transmission-related resource to the receiving UE through the fourth (or last) transmission-related PSCCH. For example, referring to Figure 11 (a) of FIG. 1, the transmitting UE can transmit / signaling the location information of not only the fourth transmission-related resource but also the location information of the third transmission-related resource to the receiving UE through the fourth (or last) transmission-related PSCCH. For example, referring to Figure 11 (b) of FIG. 1, the transmitting UE can transmit / signaling the location information of not only the fourth transmission-related resource but also the location information of the second transmission-related resource and the location information of the third transmission-related resource to the receiving UE through the fourth (or last) transmission-related PSCCH. In this case, for example, in Figure 11In (a) and (b) of the above, if the transmitting UE can transmit / signal only the location information of the fourth transmission-related resource to the receiving UE through the fourth (or last) transmission-related PSCCH, the transmitting UE can set or designate the field / bits of the location information of the unused or remaining transmission resource to a preconfigured value (e.g., 0). For example, in (a) of the above, Figure 11 In (a) and (b) of the above, if the transmitting UE can transmit / signal only the location information of the fourth transmission-related resource to the receiving UE through the fourth (or last) transmission-related PSCCH, the transmitting UE can set or designate the field / bits of the location information of the unused or remaining transmission resource to a preconfigured value (e.g., 0). For example, in (a) of the above,

[0176] Further, for example, the transmitting UE can perform the reservation of the transmission resource on a block basis. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE can transmit the location information of the K transmission resources to the receiving UE through the SCI transmitted to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI can include the location information of the K transmission resources. For example, if the transmitting UE reserves K transmission resources related to a specific TB, the transmitting UE can transmit the location information of the K transmission resources to the receiving UE through the SCI transmitted to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI can include the location information of the K transmission resources. For example, Figure 11 (c) of the above shows a method of performing the block-based resource reservation by the transmitting UE by signaling the location information of 4 transmission resources to the receiving UE through one SCI in the case where the value K = 4.

[0177] In the disclosure, for example, if the UE that has reserved the first resource removes the first resource and selects a second resource based on pre-emption or re-evaluation, the second resource can be referred to as a reselected resource.

[0178] In the disclosure, for example, the P-UE can include a pedestrian UE, a device that needs power saving, a device that performs resource selection based on partial sensing, a device that performs resource selection based on random selection (i.e., no sensing), etc.

[0179] In the disclosure, for example, the V-UE can include a vehicle, a device that does not need power saving, a device that performs resource selection based on full sensing, etc.

[0180] Based on the embodiments of this disclosure, when performing periodic resource reservation, the resource domain for the future time period in which the preemption check operation is performed in resource domain PERIOD#X can be limited to resource domain PERIOD#X+K. For example, the value of K can be fixed at 1. For example, the value of K can be a value pre-configured for the UE. In this document, for example, rules can be applied in a limited manner only when the value of the time period is greater than the minimum processing time required for the preemption check operation. For example, rules can be applied in a limited manner only when the value of the time period is greater than or equal to the minimum processing time required for the preemption check operation.

[0181] For example, when performing periodic resource reservation, on resource domain PERIOD#X, the resource domain for which a preemption check operation will be performed in the future can be limited to the resource domain of PERIOD#X after the minimum processing time required for the preemption check operation. For example, when performing periodic resource reservation, on resource domain PERIOD#X, the resource domain for which a preemption check operation will be performed in the future can be limited to the resource domain of the first future (to which the reserved resource belongs) after the minimum processing time required for the preemption check operation. For example, when performing periodic resource reservation, on resource domain PERIOD#X, the resource domain for which a preemption check operation will be performed in the future can be limited to the resource domain of the pre-configured quantity of the first future (to which the reserved resource belongs) after the minimum processing time required for the preemption check operation. For example, the pre-configured quantity could be 1.

[0182] Based on the embodiments of this disclosure, when performing periodic resource reservation, the UE can perform resource reselection based on preemption. For example, in this case, if the reselected resource cannot be signaled / reserved via the previous SCI, the UE may not signal / send a resource reservation period on the SCI associated with the reselected resource. For example, the above operation can be interpreted as a one-shot transmission type. On the other hand, for example, if the reselected resource can be signaled / reserved via the previous SCI, the UE can signal / send a resource reservation period on the SCI associated with the reselected resource, and the UE can use the reselected resource periodically.

[0183] For example, if it is necessary to reselect some resources from periodically reserved resources based on preemption, the UE can be configured to perform resource reselection for all relevant SL licenses. Alternatively, if it is necessary to reselect some resources from periodically reserved resources based on preemption, the UE can clear all relevant SL licenses and perform resource reselection.

[0184] Based on the embodiments of the disclosure, in the case of performing periodic resource reservation, in order to obtain many retransmission resources within one period, the UE can combine multiple periodic resource reservations and use them for one SL HARQ process. In this context, for example, all of the multiple combined periodic resource reservations can be configured to have (or share) the same (or common) counter value related to the number of resource reselection triggers and / or resource reservation periods. Alternatively, for example, each of the periodic resource reservations can independently have a counter value related to the number of resource reselection triggers and / or resource reservation periods. In this case, for example, if resource reselection is triggered for (at least) one periodic resource reservation, resource reselection can be performed for all of the combined periodic resource reservations. Alternatively, for example, if resource reselection is triggered for (at least) one periodic resource reservation, resource reselection can be performed only for the corresponding periodic resource reservation.

[0185] In addition, in the next generation system, in order to save the power consumption of the UE, the UE can omit the sensing operation or perform a simplified sensing operation. For example, the UE can select a reserved resource or a candidate resource for SL transmission without a sensing operation. For example, for some slots within a sensing window, the UE can attempt SCI detection, and the UE can determine whether to include or exclude the indicated reserved resource in the available resource based on the sensing information (e.g., reserved resource) indicated by the detected SCI and the legacy RSRP. For example, the UE can implement selection of the slots in which SCI detection is attempted. For example, the slots in which SCI detection is attempted can be obtained from the reserved resource or the candidate resource in which the UE will perform SL transmission. For example, the UE can obtain / determine the location of the slots for detecting SCI in the sensing window by assuming the value of a specific period of the reserved resource or the candidate resource in which SL transmission is to be performed.

[0186] For example, the UE can perform partial sensing, and the UE can select / reserve resources based on the partial sensing. For example, partial sensing can be beneficial in terms of power saving compared to full sensing. For example, in NR V2X, a full sensing procedure can be defined as shown in Tables 6 and 7. For example, in NR V2X, a full sensing procedure for preemption or re-evaluation can be defined as shown in Tables 6 to 8.

[0187] [Table 6]

[0188]

[0189]

[0190] [Table 7]

[0191]

[0192]

[0193]

[0194] [Table 8]

[0195]

[0196] For example, in LTE V2X, a partial sensing procedure can be defined as shown in Table 9.

[0197] [Table 9]

[0198]

[0199]

[0200] Based on the embodiments of the disclosure, in order to prevent the collision with other UEs (e.g., UEs performing full sensing) coexisting in the same pool to the greatest extent, the value of Y (e.g., minimum number) of the selection window related to partial sensing can be configured differently based on the priority of the transmission packet, the interference level of the resource pool, whether there is a vehicle UE (V-UE), etc. For example, the value of Y (e.g., minimum number) can be configured differently based on the priority of the transmission packet, the interference level of the resource pool, whether there is a vehicle UE (V-UE), etc., which is the number of slots of the candidate resource.

[0201] For example, in the formula (e.g., n-100*k) for determining the number / location (e.g., minimum number) of sensing subframes / slots related to a specific subframe / slot within the set of Y subframes / slots, the value of k can be limited to the value of the maximum resource reservation period allowed for the resource pool. Specifically, for example, since the UE does not perform RSSI-based sensing, the value k can be limited to the value of the maximum resource reservation period allowed for the resource pool. For example, the UE can determine the sensing subframes / slots related to a specific subframe / slot within the set of Y subframes / slots based on the value of the resource reservation period allowed for the resource pool. In the disclosure, for example, the set of Y subframes / slots can be a set of subframes / slots including at least Y candidate subframes / slots. For example, the set of Y subframes / slots can be a set of subframes / slots including at least Y candidate subframes / slots in the selection window.

[0202] Figure 12 and Figure 13 A method for a UE to determine slots for sensing based on a resource reservation period allowed for a resource pool based on the embodiments of the disclosure is shown. Figure 12 and Figure 13Embodiments of the present disclosure can be combined with various embodiments of the present disclosure.

[0203] In Figure 12 and Figure 13 In embodiments of the present disclosure, it is assumed that the allowed resource reservation periods for a resource pool are P1 and P2. Further, it is assumed that the UE performs partial sensing for selecting a slot #K.

[0204] Referring to Figure 12 , the UE can perform sensing for slots located P1 slots before slot #K and slots located P2 slots before slot #K.

[0205] Referring to Figure 13 , the UE can perform sensing for slots located P1 slots before slot #K and slots located P2 slots before slot #K. Further, optionally, the UE can perform sensing for slots located A*P1 slots before slot #K and slots located B*P2 slots before slot #K. For example, A and B can be positive integers greater than or equal to 2.

[0206] For example, in the equation (e.g., n-100*k) for determining the number / location (e.g., minimum number) of sensing subframes / slots related to a particular subframe / slot within a set of Y subframes / slots, the constant 100 can be configured / set to / different values. For example, in the equation (e.g., n-100*k) for determining the number / location (e.g., minimum number) of sensing subframes / slots related to a particular subframe / slot within a set of Y subframes / slots, the constant 100 can be configured / set to different values for each transmission packet, interference level, etc. of the P-UE. For example, in the equation (e.g., n-100*k) for determining the number / location (e.g., minimum number) of sensing subframes / slots related to a particular subframe / slot within a set of Y subframes / slots, the constant 100 can be configured / set to a value for the allowed resource reservation periods of the resource pool.

[0207] For example, if the UE selects a set of Y subframes / slots, the UE can select the set of Y subframes / slots as much as possible such that reservation by a previous SCI is possible.

[0208] For example, the value of Y can be configured differently for the UE based on retransmission requirements and / or service requirements.

[0209] For example, the UE can select Y subframes / slots in order to be able to reserve by a previous SCI.

[0210] For example, if the value of Y does not support subframes / slots up to a required number of retransmissions, the UE can not apply / perform a partial sensing operation.

[0211] For example, the UE can not perform sensing based on the formula (e.g., n-100*k) if periodic resource reservation is not allowed for the resource pool. For example, the UE can perform sensing for a pre-configured number of slots from the first slot of the selection window. For example, the UE can only sense up to 32 slots before the Nth subframe / slot.

[0212] Figure 14 A method for a UE to perform sensing for N slots based on a first slot among selectable candidate slots is shown based on embodiments of the disclosure. Figure 14 Embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0213] In Figure 14 In embodiments of the disclosure, assume that the candidate slots that the UE can select are slot #M, slot #(M+T1), and slot #(M+T1+T2). In this case, the slots that the UE needs to perform sensing can be determined based on a first slot (i.e., slot #M) among the selectable candidate slots. For example, after determining the first slot as a reference slot among the selectable candidate slots, the UE can perform sensing for (previous) N slots starting from the reference slot.

[0214] Referring to Figure 14 , based on a first slot (i.e., slot #M) among the selectable candidate slots, the UE can perform sensing for N slots. For example, the UE can perform sensing for N slots before slot #M, and the UE can select at least one SL resource from the selectable candidate slots (i.e., slot #M, slot #(M+T1), and slot #(M+T1+T2)) based on the result of the sensing. For example, N can be configured or pre-configured for the UE. For example, a time gap for processing can exist between the last slot among the N slots and slot #M.

[0215] Based on embodiments of the disclosure, a mechanism to additionally protect the transmission of P-UE compared to LTE can be introduced. For example, to save power, a mechanism to additionally protect the transmission of P-UE can be introduced.

[0216] For example, information indicating / representing a P-UE (e.g., P-UE indicator) can be included in SCI. For example, the P-UE can transmit SCI including information indicating / representing a P-UE. In this case, for example, other pre-configured RSRP threshold (e.g., Step 7 in Table 7) can be applied to the transmission of the P-UE. For example, if the UE performs a pre-emption operation or a re-evaluation operation, other pre-configured RSRP threshold (e.g., Step 7 in Table 7) can be applied to the transmission of the P-UE. For example, if the UE performs a pre-emption operation, the priority threshold (e.g., priority threshold in Table 8) for the transmission of the P-UE can be configured differently.

[0217] For example, the RSRP threshold applied in the pool allowing random sensing / partial sensing, preemption priority, and the like can be configured differently. For example, the RSRP threshold applied in the pool allowing random sensing / partial sensing, preemption priority, and the like can be configured differently compared to the pool not allowing random sensing / partial sensing.

[0218] For example, based on the format of the second SCI, PSCCH scrambling / PSCCH DMRS sequence initialization, ID on SCI, and the like, it can be distinguished whether the UE is a P-UE. For example, for interference randomization, it is necessary to determine whether to initialize PSSCH / second SCI scrambling or DMRS separately. For example, for interference randomization, PSSCH / second SCI scrambling or DMRS can be initialized separately.

[0219] For example, if the P-UE transmits SCI including a priority value, it can be configured to apply a preconfigured offset to the priority value. For example, the UE that has received the SCI can apply a preconfigured offset to the priority value, and the UE can perform a preemption operation based on the priority value to which the offset is applied.

[0220] Based on the embodiments of the disclosure, whether the UE performing partial sensing performs a preemption operation / re-evaluation operation can be configured. For example, since the preemption operation / re-evaluation operation can increase the power consumption of the UE, for the UE performing partial sensing, the preemption operation / re-evaluation operation can not be allowed.

[0221] For example, the UE performing partial sensing can perform a preemption operation / re-evaluation operation. In this case, the timeline related to the preemption operation / re-evaluation operation of the UE performing partial sensing is loose (for example, considering the frequency or time period of the detected SCI) compared to the UE performing full sensing (for example, V-UE). For example, the sensing window related to the preemption operation / re-evaluation operation of the UE performing partial sensing can be short compared to the UE performing full sensing (for example, V-UE).

[0222] For example, whether to apply the preemption operation / re-evaluation operation can be configured differently based on the type of the UE.

[0223] For example, the lower limit of the period value to which the counter scaling factor / scaling of the P-UE is applied can be configured differently from such a lower limit of the V-UE. For example, the lower limit of the period value to which the counter scaling factor / scaling is applied can be configured differently based on whether partial sensing is performed or random selection is performed.

[0224] For example, in a resource pool for P-UE only or random selection only (and / or partial sensing only), the preemption operation / re-evaluation operation can not be allowed.

[0225] Based on embodiments of the present disclosure, if a resource pool that allows both partial sensing and random selection is configured for a UE, and if the UE has partial sensing capability, and if the UE is not indicated to use either partial sensing or random selection, the UE can select partial sensing or random selection.

[0226] For example, if the interference level is high, the UE can select partial sensing, and the UE can select a resource for SL transmission based on partial sensing. For example, if the interference level of a resource pool is high, the UE can select partial sensing, and the UE can select a resource for SL transmission based on partial sensing.

[0227] For example, if the priority of the UE's packet transmission is relatively low, the UE can select partial sensing, and the UE can select a resource for SL transmission based on partial sensing. For example, if a priority value related to the UE's packet transmission is greater than a threshold value, and / or if a priority value related to the UE's packet transmission is greater than a priority value related to another UE's packet transmission, the UE can select partial sensing, and the UE can select a resource for SL transmission based on partial sensing.

[0228] For example, if the priority of the UE's packet transmission is relatively high, the UE can select partial sensing, and the UE can select a resource for SL transmission based on partial sensing. For example, if a priority value related to the UE's packet transmission is less than a threshold value, and / or if a priority value related to the UE's packet transmission is less than a priority value related to another UE's packet transmission, the UE can select partial sensing, and the UE can select a resource for SL transmission based on partial sensing.

[0229] For example, if the UE's remaining battery amount is sufficient, the UE can select partial sensing, and the UE can select a resource for SL transmission based on partial sensing. For example, if the UE's remaining battery amount is equal to or greater than a threshold value, the UE can select partial sensing, and the UE can select a resource for SL transmission based on partial sensing. For example, the UE can be a UE with RX capability.

[0230] For example, if the above conditions are not met, the UE can fall back to random selection. For example, if the above conditions are not met, the UE can select random selection, and the UE can select a resource for SL transmission based on random selection.

[0231] For example, the above disclosure can be interpreted as the UE selecting different resource selection schemes according to the priority of the service.

[0232] For example, the re-evaluation can be applied only to high-priority packet transmissions, and the pre-emption can be applied only to low-priority packet transmissions.

[0233] Based on embodiments of the disclosure, if the P-UE cannot receive the PSCCH / PSSCH, the procedure defined for the V-UE can be reused based on the (pre)configured CBR value.

[0234] For example, the CBR measurement window / CR evaluation window of the P-UE can be configured differently from that of the V-UE. For example, the P-UE can calculate / obtain the CBR value based only on the RSSI values measured in the sensing subframes / slots in the sensing window determined by the Y set. For example, the subframes / slots in the sensing window in which sensing is not performed can be counted as busy. For example, the Y set can be a set of subframes / slots including at least Y candidate subframes / slots. For example, the Y set can be a set of subframes / slots including at least Y candidate subframes / slots in the selection window.

[0235] For example, the congestion level based physical layer parameter value or the RSSI threshold value for determining busy can be configured separately for the P-UE.

[0236] For example, the CBR measurement window and / or the CR evaluation window can be (pre)configured differently for each UE type.

[0237] Based on embodiments of the disclosure, if the UE switches between multiple resource pools, a method of handling the obtained / calculated CBR value and / or the obtained / calculated CR value is proposed. For example, the obtained / calculated CBR value and / or the obtained / calculated CR value can be reset. For example, after the UE obtains the CBR value and / or the CR value for a first resource pool, if the UE switches from the first resource pool to a second resource pool, the UE can reset the CBR value and / or the CR value obtained for the first resource pool.

[0238] Based on embodiments of the disclosure, the value of X for each priority (e.g., the value X in step 7 in Table 7) can be configured separately for the P-UE. For example, the value of X for each priority of the P-UE can be configured separately from the value of X for each priority of the V-UE.

[0239] For example, the value of T2min for each priority (e.g., the value of T2min in step 1 in Table 7) can be configured separately for the P-UE. For example, the value of T2min for each priority of the P-UE can be configured separately from the value of T2min for each priority of the V-UE.

[0240] For example, the RSRP threshold boosting for P-UEs can be configured to satisfy the X% (e.g., Step 7 in Table 7) exceptionally.

[0241] For example, the value of the sensing window can be configured for P-UEs differently from V-UEs. For example, the value of the sensing window can be configured for P-UEs separately.

[0242] In addition, it is necessary to determine whether to limit the transmission scheme (e.g., rank-2, MCS table) for P-UEs, considering complexity, power consumption, etc. In addition, according to LTE V2X, a UE performing random selection / partial sensing does not perform SLSS / PSBCH transmission. In addition, in NR V2X, it is necessary to determine whether to allow a UE performing random selection / partial sensing to perform SLSS / PSBCH transmission. In addition, similar to LTE V2X, it is necessary to determine whether to set a lower limit value (e.g., 100 ms) for a selectable resource reservation period.

[0243] For example, a UE can perform SLSS / PSBCH transmission only when actually performing packet transmission. For example, as with D2D discovery, a UE can perform SLSS / PSBCH transmission only when actually performing packet transmission.

[0244] For example, a UE can perform SLSS / PSBCH transmission based on a period longer than 160 ms. For example, even if the resource for SLSS / PSBCH transmission is the same as before, a UE can perform SLSS / PSBCH transmission based on a period longer than 160 ms.

[0245] For example, if a P-UE transmits SLSS / PSBCH, the SLSS / PSBCH can be considered to be relatively high priority. For example, the priority of SLSS / PSBCH transmitted by a P-UE can be higher than the priority of SLSS / PSBCH transmitted by a V-UE. For example, since the priority of SLSS / PSBCH transmitted by a P-UE is relatively high, a neighboring UE receiving the SLSS / PSBCH can create a synchronization cluster based on the SLSS / PSBCH.

[0246] Based on the embodiments of the disclosure, a beta candidate value and / or an alpha value related to the second SCI for P-UEs can be configured differently from the beta candidate value and / or the alpha value of V-UEs. For example, the beta candidate value and / or the alpha value related to the second SCI can be configured for P-UEs separately from the beta candidate value and / or the alpha value related to the second SCI for V-UEs. For example, additionally, the corresponding parameter candidate values can be configured differently depending on whether partial sensing or random selection is performed.

[0247] For example, the DMRS pattern candidate or MCS table candidate for the P-UE can be configured differently from the V-UE. For example, the DMRS pattern candidate or MCS table candidate for the P-UE can be configured for the P-UE separately from the DMRS pattern candidate or MCS table candidate for the V-UE. For example, additionally, the corresponding parameter candidate can be configured differently based on whether partial sensing or random selection is performed.

[0248] Based on the embodiments of the disclosure, it is necessary to determine whether to allow HARQ feedback for packet transmission to be enabled based on random selection or partial sensing.

[0249] For example, packet transmission based on random selection or partial sensing can cause a large amount of interference to a UE performing full-sensing-based transmission on the same resource pool. Due to this, retransmission can increase. Therefore, for example, a RB set of a PSFCH resource can be configured separately.

[0250] For example, if a UE performing transmission based on random selection or partial sensing transmits a HARQ feedback enabling MAC PDU, the UE can use a pre-configured separate resource.

[0251] For example, only when partial sensing is allowed for a resource pool and a randomly selected resource is reserved, a UE can be allowed to transmit a HARQ feedback enabling MAC PDU based on the randomly selected resource. Alternatively, for example, if partial sensing is allowed for a resource pool and a randomly selected resource is reserved, a UE can not be allowed to transmit a HARQ feedback enabling MAC PDU based on the randomly selected resource.

[0252] For example, if ACK / NACK is supported, a value of K (e.g., PSSCH-to-PSFCH value) can be configured. For example, if the clock speed is lowered, power consumption can be reduced. In this case, a larger K value (e.g., PSSCH-to-PSFCH value) can be alternatively required.

[0253] For example, a value of the region length / width of each communication range can be configured separately for the P-UE. For example, the value of the region length / width of each communication range for the P-UE can be configured for the P-UE separately from the value of the region length / width of each communication range for the V-UE.

[0254] Based on embodiments of the present disclosure, it is necessary to determine whether SL path loss based power control is allowed for P-UEs. For example, if a P-UE has no RX capability, the P-UE can not be able to perform SL path loss based power control. For example, if a P-UE has partial RX capability, the P-UE can not be able to perform SL path loss based power control due to RSRP accuracy issues. For example, if a P-UE has partial RX capability, the P-UE can perform SL path loss based power control.

[0255] For example, the nominal power of a P-UE can be configured to be different from the nominal power of a V-UE. For example, the nominal power of a P-UE can be configured to be the same as the nominal power of a V-UE.

[0256] For example, the maximum power of a P-UE can be limited. For example, DL path loss based channel power control parameters can be included. For example, DL path loss based channel power control parameters can be limited for a P-UE.

[0257] Based on embodiments of the present disclosure, UL-SL prioritization can be different for each UE type. For example, UL-SL prioritization can also include SL prioritization cases in NR / LTE in-device coexistence. For example, a set of thresholds can be different for each UE type. For example, in in-device coexistence, SL transmission of a P-UE can be prioritized since it is important. For example, in in-device coexistence, SL transmission of a P-UE can be prioritized over other SL receptions since it is important.

[0258] For example, even if a P-UE has little chance to perform SL transmission, it can be a question whether the P-UE should drop SL transmission due to UL transmission. Therefore, SL transmission of a P-UE can be prioritized over UL transmission.

[0259] For example, whether to perform a sensing operation and / or whether to simplify a sensing operation, etc. can be (pre-)configured for each resource pool. For example, if performing a sensing operation is not supported and performing a simplified sensing operation is supported, a UE can determine whether and how to perform a sensing operation implementably. For example, a UE can determine whether and how to perform a sensing operation for each congestion level and / or for each service type and / or for each remaining power and / or for each power saving mode. For example, a UE can select partial sensing if the interference level is high, or if its packet transmission has a relatively low priority, or if the remaining battery is sufficient (over a threshold). For example, a UE can be a UE with RX capability. For example, if the above conditions are not met, a UE can fall back to random selection. For example, the above disclosure can be interpreted as a UE selects different resource selection schemes according to the priority of a service.

[0260] Further, after performing the sensing operation, the legacy UE can determine the reserved resources or candidate resources for SL transmission. Thereafter, the UE can continuously attempt to detect SCI, and the UE can perform re-evaluation, reselection, or pre-emption on the reserved resources or candidate resources based on the reserved resources indicated by the detected SCI and RSRP measurement values corresponding thereto. For example, if the RSRP measurement value of the reserved resources indicated by the latest detected SCI exceeds a certain threshold value, and if the reserved resources overlap with the candidate resources for the UE’s transmission, the UE can perform a process of reselecting the candidate resources. For example, the latest detected resources can be resources that satisfy pre-emption conditions (e.g., if the reception priority value is less than a certain threshold value and the reception priority value is less than the transmission priority value).

[0261] Based on the re-evaluation operation and / or the pre-emption operation, the UE can have to continuously attempt SCI detection after reselecting the resources, which can increase the power consumption of the UE. Accordingly, for example, whether to perform the continuous sensing operation and / or whether to perform the re-evaluation operation and / or whether to perform the pre-emption operation can be differently configured or performed for each UE type. For example, the P-UE or power saving UE can omit the continuous sensing operation and / or the re-evaluation operation and / or the pre-emption operation even if the corresponding operation is configured in the corresponding resource pool. For example, in the case of performing the continuous sensing operation and / or the re-evaluation operation and / or the pre-emption operation, a time limit for a time of SCI detection to be reflected / considered can be differently determined or configured for each UE type. For example, if it is assumed that the legacy UE determines whether to perform the re-evaluation operation and / or whether to perform the pre-emption operation based on the SCI detected from a time point m-T3 (herein, m is a candidate resource for SL transmission that first occurs in time), the P-UE can determine whether to perform the re-evaluation operation and / or whether to perform the pre-emption operation based on the SCI detected from a time point m-T’3 (e.g., herein, T’3 is a value greater than or equal to T3).

[0262] For example, in the case of determining the reserved resources indicated by the SCI detected in the sensing window, whether to apply the period and information on the number of periods (e.g., counter scaling) can be different based on the type of the UE. For example, the legacy UE determines the available resources by extending the indicated reserved resources by only one period, but the P-UE can determine the available resources by extending the indicated reserved resources by a plurality of periods. For example, the legacy UE determines the available resources by extending the indicated reserved resources by a plurality of periods, but the P-UE can determine the available resources by extending the indicated reserved resources by one period or a small number of periods.

[0263] For example, a threshold for determining whether to exclude the reserved resource from the available resources based on the indicated RSRP measurement value of the reserved resource can be (pre)configured based on the type of the UE. For example, the size of the resource reselection window can be determined differently based on the type of the UE. For example, at least one of the starting position of the resource reselection window, the lower bound of the starting position, or the upper bound of the starting position can be (pre)configured differently based on the type of the UE. For example, at least one of the ending position of the resource reselection window, the lower bound of the ending position, or the upper bound of the ending position can be (pre)configured differently based on the type of the UE. For example, the value of the allowable lower bound of the ratio of the available resources to the total resources within the resource reselection window (e.g., the X value) can be (pre)configured differently based on the type of the UE.

[0264] For example, the size of the resource sensing window can be determined differently based on the type of the UE. For example, at least one of the starting position of the resource sensing window, the lower bound of the starting position, or the upper bound of the starting position can be (pre)configured differently based on the type of the UE. For example, at least one of the ending position of the resource sensing window, the lower bound of the ending position, or the upper bound of the ending position can be (pre)configured differently based on the type of the UE.

[0265] For example, the CBR measurement window and / or the CR evaluation window can be (pre)configured differently for each UE type.

[0266] For example, the UE can distinguish / determine the type of the UE (e.g., V-UE, P-UE) based on the first SCI and / or the second SCI and / or the PSSCH. For example, the first SCI can indicate the type of the UE by using a reserved field. For example, the type of the UE can be distinguished / determined based on the format of the second SCI. For example, the type of the UE can be distinguished / determined based on the PSCCH scrambling sequence and / or the DMRS sequence and / or the PSCCH CRC masking sequence. For example, the type of the UE can be distinguished / determined based on the L1 source ID and / or the L1 destination ID. For example, if the UE determines whether to exclude the reserved resource from the available resources based on the RSRP measurement value of the reserved resource indicated by the SCI, the RSRP threshold to be used for the determination can be (pre)configured differently based on the type of the UE.

[0267] Further, SL reception operation can be limited based on the type of UE. In the above cases, a certain UE can not be able to perform PSFCH reception corresponding to PSCCH / PSSCH transmission after the PSCCH / PSSCH transmission, or can receive PSFCH at a restricted location. For example, based on the type of UE and / or sensing operation method performed by the UE or whether sensing operation is performed, whether to activate SL HARQ feedback can be differently configured / indicated. For example, a UE which does not perform sensing operation and / or a UE which performs a simplified sensing operation can not support or deactivate SL HARQ feedback. For example, based on the type of UE and / or sensing operation method performed by the UE or whether sensing operation is performed, PSFCH related configuration (e.g., period of PSFCH resource and / or location of RB and / or number of CS and / or timing or slot offset between PSSCH and PSFCH) can be differently (pre-)configured.

[0268] For example, based on the type of UE and / or sensing operation method performed by the UE or whether sensing operation is performed, whether to activate CSI report triggering can be differently configured / indicated. For example, a UE which does not perform sensing operation and / or a UE which performs a simplified sensing operation can not perform CSI report triggering. Alternatively, for example, for a UE which does not perform sensing operation and / or a UE which performs a simplified sensing operation, size of CSI report window can be differently (pre-)configured or configured (through PC5-RRC signaling).

[0269] For example, based on the type of UE and / or sensing operation method performed by the UE or whether sensing operation is performed, supportable power control method can be determined. For example, a UE which does not perform sensing operation and / or a UE which performs a simplified sensing operation can not support or deactivate power control scheme based on SL path loss. For example, for a UE which does not perform sensing operation and / or a UE which performs a simplified sensing operation, Po or nominal power value can be differently (pre-)configured. For example, for a UE which does not perform sensing operation and / or a UE which performs a simplified sensing operation, maximum transmit power value can be (pre-)configured.

[0270] For example, based on the type of UE and / or sensing operation method performed by the UE or whether sensing operation is performed, a set of thresholds for determining priority between UL and SL can be differently (pre-)configured or configured (through RRC signaling).

[0271] For example, based on the type of UE and / or sensing operation method performed by the UE or whether sensing operation is performed, second SCI mapping related parameters (e.g., beta candidate value, alpha value, etc.) can be differently (pre-)configured.

[0272] For example, the PSSCH DMRS pattern candidates can be (pre)configured differently based on the type of the UE and / or the sensing operation method or whether a sensing operation is performed by the UE. For example, the PSSCH DMRS pattern that can be indicated can be limited based on the type of the UE and / or the sensing operation method or whether a sensing operation is performed by the UE.

[0273] For example, the transmission scheme of the PSSCH can be limited based on the type of the UE and / or the sensing operation method or whether a sensing operation is performed by the UE. For example, the transmission scheme of the PSSCH can include the number of transmit antenna ports or rank. For example, the transmission scheme of the PSSCH can include information related to the available MCS table.

[0274] Hereinafter, random resource selection and partial sensing operation will be described in detail.

[0275] In this section, when the principle of LTE SL is applied to NR mode-2 operation, a high-level view on additional enhancements that can be considered for resource allocation to reduce power consumption is provided.

[0276] According to the partial sensing operation of LTE SL, when a power saving UE (P-UE) makes a resource (re)selection decision at TTI m, possible candidate resources, i.e., Y slots, are selected in a selection window, i.e., [m+T1, m+T2], and a minimum allowed value of Y is (pre)configured. Depending on what Y value is (pre)configured, the level of power consumption and the number of possible retransmissions are changed. To avoid the problematic case that the (pre)configured Y value is smaller than the necessary number of retransmissions, it can be considered that different Y values are (pre)configured for each priority value (or service type / requirement). By doing so, different numbers of retransmissions required by different service types can be efficiently supported even in the case of partial sensing operation. In addition, if the interference level (e.g., CBR) in a resource pool is low, the possibility of resource collision among different UEs can be low from an average point of view. In this case, even if a relatively small Y value is applied, the performance degradation is not significant. When there are UEs performing sensing operation in the same resource pool, it would be desirable to reduce the interference to the resources selected by the corresponding UEs as much as possible. Considering these aspects, it can be defined that different (pre)configured Y values are applied to different interference levels of a resource pool, or depending on whether a UE performing sensing operation is detected (e.g., especially when the UE type information is signaled via SCI). It is also needed to discuss whether to simply reuse the LTE SL principle of determining the minimum number or location of slots to be monitored for slot n within the set of Y slots. Specifically, in LTE SL, a P-UE senses at least slot n-100*k in any candidate resource in slot n within the set of Y slots, and the set of k is (pre)configured with every element in the range [1, 10]. We consider that under NR mode 2, since there is no need to perform RSSI measurement within the sensing window, the upper limit of k value is set to the maximum reservation period allowed in the resource pool. If the first slot to be monitored is always located 100 slots before slot n, it would be difficult to avoid the collision with a UE including a reservation resource with a short period (e.g., < 100 slots). When only candidate with a relatively short reservation period is allowed in the resource pool, the problem becomes worse. Thus, the constant value (i.e., 100) in the expression of ‘slot n-100*k’ can be changed to a (pre)configured value.

[0277] For example, due to the UE’s ((LTE / NR) SL and / or UL) transmission operation, if the UE fails to perform monitoring for some of the slots M (e.g., M = N - 100*K) among (in the sensing window), for which the sensing related to the slot N in the selection window selected based on the Y value selection (as described above) should be performed, the UE can be configured to exclude the slot N from the Y slots selected in the selection window. For example, due to the UE’s ((LTE / NR) SL and / or UL) transmission operation, if the UE fails to perform monitoring for some of the slots M (e.g., M = N - 100*K) among (in the sensing window), for which the sensing related to the slot N in the selection window selected based on the Y value selection (as described above) should be performed, the UE can be configured to select the slot N with lower priority in the selection window.

[0278] For example, due to the UE’s ((LTE / NR) SL and / or UL) transmission operation, if the UE fails to perform monitoring for a number / ratio of slots M (e.g., M = N - 100*K) among (in the sensing window) that is greater than or equal to a pre-configured threshold number / ratio (TH_NMN), for which the sensing related to the slot N in the selection window selected based on the Y value selection (as described above) should be performed, the UE can be configured to exclude the slot N from the Y slots selected in the selection window. For example, due to the UE’s ((LTE / NR) SL and / or UL) transmission operation, if the UE fails to perform monitoring for a number / ratio of slots M (e.g., M = N - 100*K) among (in the sensing window) that is greater than or equal to a pre-configured threshold number / ratio (TH_NMN), for which the sensing related to the slot N in the selection window selected based on the Y value selection (as described above) should be performed, the UE can be configured to select the slot N with lower priority in the selection window.

[0279] For example, due to the UE’s ((LTE / NR) SL and / or UL) transmission operation, if the UE fails to perform monitoring for all of the slots M (e.g., M = N - 100*K) among (in the sensing window), for which the sensing related to the slot N in the selection window selected based on the Y value selection (as described above) should be performed, the UE can be configured to exclude the slot N from the Y slots selected in the selection window. For example, due to the UE’s ((LTE / NR) SL and / or UL) transmission operation, if the UE fails to perform monitoring for all of the slots M (e.g., M = N - 100*K) among (in the sensing window), for which the sensing related to the slot N in the selection window selected based on the Y value selection (as described above) should be performed, the UE can be configured to select the slot N with lower priority in the selection window.

[0280] For example, if the above rule is applied, the UE can select Y slots (limitedly or preferentially) in the selection window so as to be able to sense all (relevant) slots based on the pre-configured K value. For example, the UE can select Y slots (limitedly or preferentially) in the selection window so as to be able to sense a number of slots (TH_YMN) greater than or equal to a pre-configured threshold number / ratio among the (relevant) slots based on the pre-configured K value.

[0281] For example, if the UE performs (periodic) resource selection / reservation related to multiple SL grants (and / or booking procedures) (BK_PR) based on partial sensing, and if the UE selects Y slots in the selection window related to a specific BK_PR #A, the UE can preferentially select Y slots such that the slots for which sensing should be performed based on the K value overlap as much as possible with the slots for which sensing is performed in other BK_PR #B related resource selection / reservation. For example, if the UE performs (periodic) resource selection / reservation related to multiple SL grants (and / or booking procedures) (BK_PR) based on partial sensing, and if the UE selects Y slots in the selection window related to a specific BK_PR #A, the UE can preferentially select Y slots such that the slots for which sensing should be performed based on the K value overlap more than or equal to a pre-configured threshold number (TH_OMN) with the slots for which sensing is performed in other BK_PR #B related resource selection / reservation. For example, if the UE selects / determines sensing slots for BK_PR #A related resource selection / reservation, the UE can preferentially select / use sensing slots for BK_PR #B related resource selection / reservation.

[0282] For example, unlike a V-UE, the (maximum or minimum) size of the sensing window and / or the (maximum or minimum) number of sensing slots (SEN_WIN) of a P-UE can be considered / determined as a maximum value among the resource reservation periodicity values configured / allowed for a resource pool. For example, unlike a V-UE, the (maximum or minimum) size of the sensing window and / or the (maximum or minimum) number of sensing slots (SEN_WIN) of a P-UE can be considered / determined as a minimum value among the resource reservation periodicity values configured / allowed for a resource pool. For example, unlike a V-UE, the (maximum or minimum) size of the sensing window and / or the (maximum or minimum) number of sensing slots (SEN_WIN) of a P-UE can be considered / determined as an average value of the resource reservation periodicity values configured / allowed for a resource pool. For example, unlike a V-UE, the (maximum or minimum) size of the sensing window and / or the (maximum or minimum) number of sensing slots (SEN_WIN) of a P-UE can be considered / determined as a pre-configured resource reservation periodicity value configured / allowed for a resource pool. For example, the (maximum or minimum) size of the sensing window and / or the (maximum or minimum) number of sensing slots can be configured differently based on the type of UE.

[0283] For example, at least one of the (maximum or minimum) number, pattern / combination, (maximum or minimum) size of the sensing window, and / or (maximum or minimum) number of sensing slots of slot M (e.g., M = N - 100*K) that the UE shall perform sensing related to the selection of slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) per priority of the service / packet. For example, at least one of the (maximum or minimum) number, pattern / combination, (maximum or minimum) size of the sensing window, and / or (maximum or minimum) number of sensing slots of slot M (e.g., M = N - 100*K) that the UE shall perform sensing related to the selection of slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) per service / packet requirement. For example, at least one of the (maximum or minimum) number, pattern / combination, (maximum or minimum) size of the sensing window, and / or (maximum or minimum) number of sensing slots of slot M (e.g., M = N - 100*K) that the UE shall perform sensing related to the selection of slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) per remaining PDB value related to the transmission of the packet. For example, at least one of the (maximum or minimum) number, pattern / combination, (maximum or minimum) size of the sensing window, and / or (maximum or minimum) number of sensing slots of slot M (e.g., M = N - 100*K) that the UE shall perform sensing related to the selection of slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) per congestion level (e.g., CBR) in the resource pool. For example, at least one of the (maximum or minimum) number, pattern / combination, (maximum or minimum) size of the sensing window, and / or (maximum or minimum) number of sensing slots of slot M (e.g., M = N - 100*K) that the UE shall perform sensing related to the selection of slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) based on whether the packet (e.g., MAC PDU) is transmitted based on HARQ feedback. For example, at least one of the (maximum or minimum) number, pattern / combination, (maximum or minimum) size of the sensing window, and / or (maximum or minimum) number of sensing slots of slot M (e.g., M = N - 100*K) that the UE shall perform sensing related to the selection of slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) per performing re-evaluation.For example, at least one of the (max or min) number, pattern / combination, (max or min) size of the sensing window, and / or (max or min) number of sensing slots of the slots M (e.g., M = N - 100*K) (in the sensing window) that the UE shall perform sensing in relation to the slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) for the resource selection based on the initial sensing. For example, at least one of the (max or min) number, pattern / combination, (max or min) size of the sensing window, and / or (max or min) number of sensing slots of the slots M (e.g., M = N - 100*K) (in the sensing window) that the UE shall perform sensing in relation to the slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) for the resource reselection based on the pre-emption. For example, at least one of the (max or min) number, pattern / combination, (max or min) size of the sensing window, and / or (max or min) number of sensing slots of the slots M (e.g., M = N - 100*K) (in the sensing window) that the UE shall perform sensing in relation to the slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) for the resource reselection based on the re-evaluation. For example, at least one of the (max or min) number, pattern / combination, (max or min) size of the sensing window, and / or (max or min) number of sensing slots of the slots M (e.g., M = N - 100*K) (in the sensing window) that the UE shall perform sensing in relation to the slot N in the selection window based on the Y-value selection (as described above) can be configured (independently or differently) for the resource reselection based on the pre-emption.

[0284] For example, if the UE performs resource selection / reservation based on the initial sensing, the (max or min) size of the sensing window and / or (max or min) number of sensing slots (INI_SENS) in relation to the initial sensing can be configured to be relatively large and / or multiple (e.g., 1 second or number of slots within 1 second). On the other hand, for example, if the UE performs pre-emption check / operation for the selected / reserved resource (signaled by SCI) and / or performs re-evaluation operation for the reselected resource and / or performs re-evaluation operation for the resource selected based on the initial sensing afterwards, the (max or min) size of the sensing window and / or (max or min) number of sensing slots (AF_SENS) in relation to the operation can be configured to be relatively small and / or few (e.g., 32 slots).

[0285] For example, if the UE performs resource selection / reservation based on initial sensing, the (max or min) size of the sensing window and / or the (max or min) number of sensing slots related to initial sensing (INI_SENS) can be configured to be relatively small and / or few. On the other hand, for example, if the UE performs pre-emption check / operation for selected / reserved resources (signaled by SCI) and / or performs re-evaluation operation for re-selected resources and / or performs re-evaluation operation for resources selected based on initial sensing later, the (max or min) size of the sensing window and / or the (max or min) number of sensing slots related to operation (AF_SENS) can be configured to be relatively large and / or many.

[0286] For example, if the UE performs random resource selection (without sensing) and / or resource selection based on partial sensing, other UEs need to perform sensing / conflict avoidance (based on re-evaluation / pre-emption) effectively for the resources. To this end, in the selection window, the UE can (preferentially or limitedly) select resources located after a pre-configured offset value (OFF VAL) from the start time of the selection window.

[0287] For example, the UE can be configured to signal / send information related to the type of sensing performed (e.g., no sensing, partial sensing, full sensing) and / or information related to the type of resource selection / reservation (e.g., random selection) through a pre-configured bit (e.g., reservation bit) and / or a field included in SCI. In this context, for example, if the UE detects / determines that a transmission resource (SEN RSC) selected / reserved by (other UEs (e.g., can be limited to P-UE)) based on a pre-configured type of sensing and / or resource selection / reservation (e.g., can be configured to be at least one of no sensing (or partial sensing or full sensing) or random selection), and if there is a selection / reserved resource of the UE overlapping with SEN RSC in the pre-emption procedure and / or the re-evaluation procedure, (A) the UE (always) performs resource reselection, and / or (B) the UE can perform pre-emption operation and / or re-evaluation operation by assuming that the (packet) priority related to SEN RSC is a pre-configured value (or by adding a pre-configured offset value (PRI OFF) to the (packet) priority related to SEN RSC or by assuming that the (packet) priority related to SEN RSC is (always) higher than its own (packet) priority).

[0288] For example, if the pre-configured type of UE receives a successfully decoded MAC PDU again (exceptionally), the UE can be configured to omit the PSFCH transmission (e.g., ACK). For example, if the pre-configured type of UE receives a successfully decoded MAC PDU again (exceptionally), the UE can perform the PSFCH transmission up to a pre-configured threshold number of times (RE_THNUM).

[0289] For example, the parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF VAL, PRI OFF, and / or RE TH NUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) per priority of the service / packet. For example, the parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF VAL, PRI OFF, and / or RE TH NUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) per requirement of the service / packet. For example, the parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF VAL, PRI OFF, and / or RE TH NUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) per remaining PDB value related to the transmission packet. For example, the parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF VAL, PRI OFF, and / or RE TH NUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) per congestion level (e.g., CBR) in the resource pool. For example, the parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF VAL, PRI OFF, and / or RE TH NUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) based on whether to send the packet (e.g., MAC PDU) based on HARQ feedback. For example, the parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF VAL, PRI OFF, and / or RE TH NUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) per performing reevaluation. For example, the parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF VAL, PRI OFF, and / or RE TH NUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) per performing preemption. For example, the parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF VAL, PRI OFF, and / or RE TH NUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) per resource reselection based on reevaluation.For example, parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF_VAL, PRI_OFF, and / or RE_THNUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) for resource reselection based on pre-emption. For example, parameters (e.g., TH_NMN, TH_YMN, TH_OMN, SEN_WIN, INI_SENS, AF_SENS, OFF_VAL, PRI_OFF, and / or RE_THNUM) and / or whether to apply the rules of the present disclosure can be configured (independently or differently) for resource selection based on initial sensing.

[0290] Proposal 1: For partial sensing operation, RAN1 discusses how to (pre)configure / determine the minimum number of candidate slots within the selection window and the minimum number or location of slots to be monitored within the sensing window.

[0291] When TX pool configuration allows both partial sensing operation and random resource selection and does not indicate that P-UE uses only one of them, it is needed to discuss how to select one of them. For example, it can be defined that P-UE selects partial sensing operation if the interference level / residual battery amount of the resource pool is above a (pre)configured threshold (or the priority value of the packet to be transmitted is below a (pre)configured threshold). Otherwise, random resource selection is selected.

[0292] Proposal 2: For the case that TX pool (pre)configuration allows both partial sensing operation and random resource selection, RAN1 discusses whether or how to define criteria for selecting one of them.

[0293] One of the methods to reduce the power consumption of P-UEs is to reduce the likelihood of retransmission (or to improve the success rate of packet transmission). In this sense, we can discuss potential enhancements to protect the transmission of P-UEs. For example, after defining the signaling of UE type information via SCI, whether to exclude the resources reserved by P-UEs (from the set of candidate resources within the selection window) when detecting them during the sensing operation (or re-evaluation / pre-emption procedure) is determined based on a separately (pre-)configured RSRP threshold. The RSRP threshold applied to the resources reserved by P-UEs can be set to be lower relative to the RSRP threshold applied to the resources reserved by vehicle UEs (V-UEs). Alternatively, a (pre-)configured offset value can be considered to be added to the RSRP value measured in the resources reserved by P-UEs. In the pre-emption operation, different (pre-)configured priority thresholds can be applied between the resources reserved by different UE types (e.g., applying a relatively high priority threshold to the resources reserved by P-UEs). Furthermore, to enable P-UEs to select resources with a relatively low interference level, a minimum percentage (X) of the candidate resources remaining after the resource exclusion procedure (or a minimum value of T2 of the selection window) can be (pre-)configured differently for V-UEs. When the ratio of the identified candidate resources to the total number of resources in the selection window is less than X%, an upper limit of the number of RSRP threshold increments (or increased RSRP threshold) can be (pre-)configured for P-UEs.

[0294] Proposal 3: RAN1 discusses whether or how to protect the reserved resources of P-UEs and enable P-UEs to select resources with low interference levels.

[0295] When random resource selection is used, it is desirable to minimize the interference to the resources selected by another UE that has performed a sensing operation. In this sense, for NR Mode-2, the mechanism of LTE SL can be reused if partial sensing is allowed in the TX pool, where a randomly selected resource is reselected after a periodic resource reservation procedure.

[0296] Proposal 4: RAN1 discusses how to enable other UEs (that perform a sensing operation) to avoid the resources randomly selected by P-UEs.

[0297] Since the re-evaluation / pre-emption procedure requires additional power consumption, it is needed to discuss whether / when a P-UE performs these operations. For example, it can simply be defined that a P-UE does not support / perform those kinds of operations, but the likelihood that a transmission resource of a P-UE collides with a transmission resource of another UE will increase. Alternatively, whether a P-UE performs a re-evaluation / pre-emption operation can be determined by taking into account, for example, the interference level of the resource pool, the priority of the packet to be transmitted, and the amount of remaining battery. In particular, in case the resource pool interference level / amount of remaining battery is below a (pre)configured threshold, a P-UE does not need to perform such operations. In addition, a re-evaluation operation is performed only for packets with a low priority value, while a pre-emption operation is performed only for packets with a high priority value. The frequency / part of performing a re-evaluation / pre-emption operation can be (pre)configured for a P-UE.

[0298] Proposal 5: RAN1 discusses whether or how to allow re-evaluation / pre-emption operations for P-UEs.

[0299] Considering the possibility that a P-UE does not have SL RX capability, it is needed to discuss how to support PHY parameter adjustment in terms of congestion control. We think that the principle of LTE SL can be reused, where the selection of the PHY parameter is based on a (pre)configured CBR value.

[0300] Proposal 6: RAN1 discusses how to support PHY parameter adjustment in terms of congestion control when a P-UE does not have SL RX capability.

[0301] One of the topics that needs further discussion is whether a P-UE can transmit a HARQ feedback (FD) enabled MAC PDU by using a randomly selected resource. If allowed, the transmission on a randomly selected resource can generate interference to both PSSCH / PSCCH RX and PSFCH RX of other UEs. To solve this problem, for example, it can be defined that a HARQ FD enabled MAC PDU is transmitted only using a resource selected by a sensing operation (i.e., a HARQ FD disabled MAC PDU can be transmitted using a randomly selected resource only). Alternatively, a set of PSFCH resources can be additionally (pre)configured for a randomly selected resource, which is orthogonal to the set of PSFCH resources of a resource selected by a sensing operation. The resource pool for HARQ FD enabled MAC PDU transmission can be (pre)configured separately between a randomly selected resource and a resource selected by using a sensing operation. It can also be (pre)configured separately for a P-UE the minimum time gap between a PSSCH and an associated PSFCH, which can be larger than that of a V-UE (e.g., to achieve power consumption reduction gain due to low processing / clock speed).

[0302] Proposal 7: RAN1 discusses whether or how to enable MAC PDU transmission by using HARQ FD with randomly selected resources.

[0303] In addition, it is necessary to discuss whether or not the OLPC parameter / maximum SL TX power value (in the power control procedure based on SL / DL PL) is the same between P-UEs and V-UEs. For example, in order to reduce power consumption, a relatively small OLPC parameter / maximum SL TX power value can be (pre-)configured separately for P-UEs.

[0304] Proposal 8: RAN1 discusses whether or how to support TX power control for P-UEs.

[0305] Since the dropping of SL packet TX has a negative impact on power consumption reduction, it is necessary to have a discussion on how to handle SL TX of P-UEs in the UL-SL prioritization procedure. For example, a separately (pre-)configured SL (or UL) priority threshold for deciding which TX to drop when SL TX overlaps with UL TX from the P-UE perspective can be defined. This SL (or UL) priority threshold can be relatively larger (or smaller) than the SL (or UL) priority threshold used for V-UEs to perform the UL-SL prioritization procedure. Alternatively, a (pre-)configured offset value can be added to the priority value of SL TX of P-UEs. By doing so, it is possible to avoid frequently dropping SL TX of P-UEs.

[0306] Proposal 9: RAN1 discusses whether or how to handle SL TX of P-UEs in the UL-SL prioritization procedure.

[0307] If the reliability of packet transmission is increased, it can be helpful for P-UEs to reduce power consumption. In this sense, a beta value (or an alpha value determining the upper limit of the second SCI mapping RE) that determines / adjusts the number of second SCI mapping REs can be (pre-)configured separately for P-UEs, which can be larger than that of V-UEs (e.g., to achieve the second SCI decoding performance gain resulting from a low coding rate). Depending on what kind of sensing method is used, the interference level on the selected resource can be different. In consideration of this aspect, different sets of beta values can be (pre-)configured between random resource selection and partial sensing operation (or between full sensing operation and partial sensing operation).

[0308] Proposal 10: RAN1 discusses whether or how to increase the reliability of packet transmission for P-UEs.

[0309] To reduce the complexity / power consumption of P-UE, it is needed to discuss whether to support / perform PSSCH TX and SL-SSB TX with 2 layers (or high modulation order). In LTE SL, P-UE performing partial sensing operation or random resource selection does not transmit SL-SSB. For example, it can be defined that P-UE performs SL-SSB TX only in the most recent SLSS slot before the actual packet is to be transmitted. With this approach, the power consumed by SL-SSB TX can be reduced.

[0310] Proposal 11: RAN1 discusses how to define the capability of P-UE, e.g., for PSSCH TX with 2 layers, high modulation order, and SL-SSB TX.

[0311] Based on various embodiments of the disclosure, a UE can perform resource (re)selection in different ways based on the type of the UE and / or based on the sensing operation method performed by the UE or whether the sensing operation is performed. With this, resource collision can be minimized while maximizing power saving gain.

[0312] Figure 15 A method of a first device performing wireless communication based on an embodiment of the disclosure is illustrated. Figure 15 Embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0313] Referring to Figure 15 At step S1510, the first device can determine a selection window. At step S1520, the first device can select Y candidate slots within the selection window. At step S1530, the first device can determine at least one slot related to the Y candidate slots based on a resource reservation period value configured for a resource pool. At step S1540, the first device can select at least one SL resource from among sidelink (SL) resources included in the Y candidate slots based on sensing for the at least one slot. At step S1550, the first device can perform SL communication based on the at least one SL resource. For example, the value of Y can be a positive integer.

[0314] Additionally, for example, the first device can determine the value of Y based on a priority of a medium access control protocol data unit (MAC PDU) to be transmitted. For example, at least one candidate value of Y can be configured for the first device for each priority.

[0315] Additionally, for example, the first device can determine the value of Y based on a congestion level of a resource pool. For example, at least one candidate value of Y can be configured for the first device for each congestion level.

[0316] For example, the Y candidate slots can be selected to be able to be informed by a previous sidelink control information (SCI).

[0317] Additionally, for example, the first apparatus can receive, from the second apparatus, first sidelink control information (SCI) including information related to the first priority and information related to the first resource, and the first apparatus can receive, from the third apparatus, second SCI including information related to the second priority and information related to the second resource. For example, the second apparatus can be a power saving required apparatus, and the third apparatus can be a power saving not required apparatus.

[0318] Additionally, for example, based on the first resource overlapping at least one SL resource, the first apparatus can determine whether to reselect the first resource based on a first RSRP threshold, and based on the second resource overlapping at least one SL resource, the first apparatus can determine whether to reselect the second resource based on a second RSRP threshold. For example, the first RSRP threshold related to the power saving required apparatus can be different from the second RSRP threshold related to the power saving not required apparatus.

[0319] Additionally, for example, based on the first resource overlapping at least one SL resource, the first apparatus can determine whether to reselect the first resource based on the information related to the first priority and a first priority threshold, and based on the second resource overlapping at least one SL resource, the first apparatus can determine whether to reselect the second resource based on the information related to the second priority and a second priority threshold. For example, the first priority threshold related to the power saving required apparatus can be different from the second priority threshold related to the power saving not required apparatus.

[0320] Additionally, for example, based on the first resource overlapping at least one SL resource, the first apparatus can determine whether to reselect the first resource based on information related to a third priority. For example, the information related to the third priority can be a value obtained by applying a priority offset value to a first priority threshold related to the power saving required apparatus. Additionally, for example, based on the second resource overlapping at least one SL resource, the first apparatus can determine whether to reselect the second resource based on information related to a second priority.

[0321] For example, the first SCI includes information indicating a power saving apparatus.

[0322] For example, based on not allowing resource selection based on full sensing for a resource pool, the first apparatus can not be allowed to perform a reevaluation operation or a preemption operation on the resource pool.

[0323] For example, for a resource pool, partial sensing based resource selection or random resource selection can be allowed. For example, based on a congestion level of the resource pool being higher than a threshold level, at least one SL resource can be selected based on partial sensing. For example, based on a remaining battery amount of the first device being greater than a threshold, at least one SL resource can be selected based on partial sensing. Additionally, for example, based on a priority of a medium access control protocol data unit (MAC PDU) to be transmitted, the first device can select one of partial sensing based resource selection or random resource selection.

[0324] For example, the resource reservation period value can include a maximum resource reservation period value. For example, an interval between the at least one time slot can not exceed the maximum resource reservation period value.

[0325] For example, the at least one time slot can be obtained by the following equation.

[0326] at least one time slot = n - a*k

[0327] Here, n can be Y candidate time slots, k can be a bitmap for indicating the at least one time slot, and a can be a resource reservation period value.

[0328] The proposed method can be applied to a device based on various embodiments of the disclosure. First, the processor 102 of the first device 100 can determine a selection window. Additionally, the processor 102 of the first device 100 can select Y candidate time slots within the selection window. Additionally, the processor 102 of the first device 100 can determine at least one time slot related to the Y candidate time slots based on a resource reservation period value configured for a resource pool. Additionally, the processor 102 of the first device 100 can select at least one sidelink (SL) resource from among SL resources included in the Y candidate time slots based on sensing for the at least one time slot. Additionally, the processor 102 of the first device 100 can control the transceiver 106 to perform SL communication based on the at least one SL resource. For example, a value of Y can be a positive integer.

[0329] Based on embodiments of the disclosure, a first device configured to perform wireless communication can be provided. For example, 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 determine a selection window, select Y candidate slots within the selection window, determine at least one slot related to the Y candidate slots based on a resource reservation period value configured for a resource pool, select at least one sidelink (SL) resource from among SL resources included in the Y candidate slots based on sensing for the at least one slot, and perform SL communication based on the at least one SL resource. For example, a value of Y can be a positive integer.

[0330] Based on embodiments of the disclosure, a device configured to control a first user equipment (UE) can be provided. For example, the device can include one or more processors, and one or more memories that are connected to the one or more processors in operation and store instructions. For example, the one or more processors can execute the instructions to determine a selection window, select Y candidate slots within the selection window, determine at least one slot related to the Y candidate slots based on a resource reservation period value configured for a resource pool, select at least one sidelink (SL) resource from among SL resources included in the Y candidate slots based on sensing for the at least one slot, and perform SL communication based on the at least one SL resource. For example, a value of Y can be a positive integer.

[0331] Based on embodiments of the disclosure, a non-transitory computer-readable storage medium storing instructions can be provided. For example, the non-transitory computer-readable storage medium stores instructions that, when executed, can cause a first device to determine a selection window, select Y candidate slots within the selection window, determine at least one slot related to the Y candidate slots based on a resource reservation period value configured for a resource pool, select at least one sidelink (SL) resource from among SL resources included in the Y candidate slots based on sensing for the at least one slot, and perform SL communication based on the at least one SL resource. For example, a value of Y can be a positive integer.

[0332] Figure 16 A method for a first device to perform wireless communication based on embodiments of the disclosure is shown. Figure 16 Embodiments of the disclosure can be combined with various embodiments of the disclosure.

[0333] Reference is made to Figure 16At step S1610, the first apparatus can determine selectable candidate slots for sidelink (SL) transmission. At step S1620, the first apparatus can determine N slots for sensing according to a first slot among the selectable candidate slots. For example, the N slots can be at least one slot for selecting at least one SL resource from among SL resources included in the selectable candidate slots. At step S1630, the first apparatus can select the at least one SL resource based on sensing for the N slots. At step S1640, the first apparatus can transmit a medium access control protocol data unit (MAC PDU) to a second apparatus through a physical sidelink shared channel (PSSCH) based on the at least one SL resource. For example, a value of N can be a positive integer.

[0334] For example, based on a change in a location of the first slot, a location of the N slots for sensing can be changed.

[0335] For example, the N slots for sensing can be determined based on a location of the first slot among the selectable candidate slots regardless of a timing at which resource selection is triggered.

[0336] For example, the at least one SL resource can be selected from among candidate SL resources. For example, a number of the candidate SL resources can be greater than or equal to X% of a total number of candidate resources, and a value of X can be differently configured based on whether the first apparatus is a power saving required apparatus, and the value of X can be a positive integer. For example, based on the number of the candidate SL resources being less than X% of the total number of the candidate resources and the first apparatus being the power saving required apparatus, a reference signal received power (RSRP) threshold value boosting to ensure that the number of the candidate SL resources is greater than or equal to X% of the total number of the candidate resources can not be allowed for the first apparatus, and the value of X can be a positive integer.

[0337] Additionally, for example, the first apparatus can transmit sidelink control information (SCI) through the PSSCH. For example, based on whether the first apparatus is the power saving required apparatus, parameters for mapping the SCI on resources related to the PSSCH can be differently configured. For example, based on a resource selection method of the first apparatus, the parameters for mapping the SCI on the resources related to the PSSCH can be differently configured, and the resource selection method can include resource selection based on random selection, resource selection based on partial sensing, or resource selection based on full sensing.

[0338] Additionally, for example, the first device can transmit a demodulation reference signal (DMRS). For example, a candidate pattern for mapping the DMRS can be differently configured based on whether the first device is a power saving required device. For example, a candidate pattern for mapping the DMRS can be differently configured based on a resource selection method of the first device, and the resource selection method can include a resource selection based on random selection, a resource selection based on partial sensing, or a resource selection based on full sensing.

[0339] For example, a candidate modulation and coding scheme (MCS) table can be differently configured based on whether the first device is a power saving required device.

[0340] For example, a candidate modulation and coding scheme (MCS) table can be differently configured based on a resource selection method of the first device, and the resource selection method can include a resource selection based on random selection, a resource selection based on partial sensing, or a resource selection based on full sensing.

[0341] For example, based on the first device performing a resource selection based on partial sensing, the first device can not be allowed to enable a hybrid automatic repeat request (HARQ) feedback for a MAC PDU.

[0342] The proposed method can be applied to a device based on various embodiments of the disclosure. First, the processor 102 of the first device 100 can determine selectable candidate slots for a sidelink (SL) transmission. In addition, the processor 102 of the first device 100 can determine N slots for sensing according to a first slot among the selectable candidate slots. For example, the N slots can be at least one slot for selecting at least one SL resource from among SL resources included in the selectable candidate slots. In addition, the processor 102 of the first device 100 can select at least one SL resource based on sensing for the N slots. In addition, the processor 102 of the first device 100 can transmit a medium access control protocol data unit (MAC PDU) through a physical sidelink shared channel (PSSCH) to a second device based on the at least one SL resource. For example, the value of N can be a positive integer.

[0343] Based on the embodiments of the disclosure, a first device configured to perform wireless communication can be provided. For example, 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 determine selectable candidate slots for sidelink (SL) transmission, determine N slots for sensing according to a first slot among the selectable candidate slots, where the N slots are at least one slot for selecting at least one SL resource from among SL resources included in the selectable candidate slots, select the at least one SL resource based on sensing for the N slots, and transmit a medium access control protocol data unit (MAC PDU) to a second device through a physical sidelink shared channel (PSSCH) based on the at least one SL resource. For example, a value of N can be a positive integer.

[0344] Based on the embodiments of the disclosure, a device configured to control a first user equipment (UE) can be provided. For example, the device can include one or more processors, and one or more memories that are connected to the one or more processors in operation and store instructions. For example, the one or more processors can execute the instructions to determine selectable candidate slots for sidelink (SL) transmission, determine N slots for sensing according to a first slot among the selectable candidate slots, where the N slots are at least one slot for selecting at least one SL resource from among SL resources included in the selectable candidate slots, select the at least one SL resource based on sensing for the N slots, and transmit a medium access control protocol data unit (MAC PDU) to a second device through a physical sidelink shared channel (PSSCH) based on the at least one SL resource. For example, a value of N can be a positive integer.

[0345] Based on the embodiments of the disclosure, a non-transitory computer-readable storage medium storing instructions can be provided. For example, the non-transitory computer-readable storage medium stores instructions that, when executed, can cause a first device to determine selectable candidate slots for sidelink (SL) transmission, determine N slots for sensing according to a first slot among the selectable candidate slots, where the N slots are at least one slot for selecting at least one SL resource from among SL resources included in the selectable candidate slots, select the at least one SL resource based on sensing for the N slots, and transmit a medium access control protocol data unit (MAC PDU) to a second device through a physical sidelink shared channel (PSSCH) based on the at least one SL resource. For example, a value of N can be a positive integer.

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

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

[0348] Various descriptions, functions, processes, proposals, methods, and / or operation flows of the disclosure described in this document can be applied to, but are not limited to, various fields requiring wireless communication / connection between apparatuses (e.g., 5G).

[0349] Hereinafter, a description will be given in greater detail with reference to the accompanying drawings. In the following drawings / description, the same reference numerals can denote the same or corresponding hardware blocks, software blocks, or functional blocks unless otherwise described.

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

[0351] Referring to Figure 17 , the communication system (1) to which various embodiments of the disclosure are applied includes wireless devices, base stations (BSs), and a network. Herein, a wireless device denotes an apparatus that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)) and can be referred to as a communication / radio / 5G device. The wireless device can include, without being limited to, a robot (100a), a vehicle (100b-1, 100b-2), an extended reality (XR) device (100c), a hand-held device (100d), a home appliance (100e), an Internet of Things (IoT) device (100f), and an artificial intelligence (AI) device / server (400). For example, the vehicle can include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Herein, the vehicle can include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device can include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and can be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device can include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or smartglasses), and a computer (e.g., a notebook). The home appliance can include a TV, a refrigerator, and a washing machine. The IoT device can include a sensor and a smartmeter. For example, the BS and the network can be implemented as a wireless device, and a specific wireless device (200a) can operate as a BS / network node with respect to other wireless devices.

[0352] Here, in addition to LTE, NR, and 6G, a wireless communication technology implemented in the wireless devices 100a to 100f of the disclosure can also include a narrowband Internet of Things for low-power communication. In this case, for example, the NB-IoT technology can be an example of a low-power wide-area network (LPWAN) technology, and can be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, without being limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the disclosure can perform communication based on the LTE-M technology. In this case, as an example, the LTE-M technology can be an example of a LPWAN, and can be referred to by various names including enhanced machine type communication (eMTC) or the like. For example, the LTE-M technology can be implemented as at least any of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication, and / or 7) LTE M, without being limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the disclosure can include at least one of Bluetooth, low-power wide-area network (LPWAN), and ZigBee considering low-power communication, without being limited to the above names. As an example, the ZigBee technology can generate a personal area network (PAN) related to small / low-power digital communication based on various standards including IEEE 802.15.4 or the like, and can be referred to by various names.

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

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

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

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

[0357] The first wireless device 100 can include one or more processors 102 and one or more memories 104, and can additionally further include one or more transceivers 106 and / or one or more antennas 108. The processor(s) 102 can control the memory(ies) 104 and / or the transceiver(s) 106, and can be configured to implement the descriptions, functions, procedures, proposals, methods and / or operational flows disclosed in the present document. For example, the processor(s) 102 can process information in the memory(ies) 104 to generate first information / signals, and then transmit radio signals including the first information / signals through the transceiver(s) 106. The processor(s) 102 can receive radio signals including second information / signals through the transceiver(s) 106, and then store information obtained by processing the second information / signals in the memory(ies) 104. The memory(ies) 104 can be connected to the processor(s) 102, and can store various information related to operations of the processor(s) 102. For example, the memory(ies) 104 can store software code including commands for executing a part or the whole of processes controlled by the processor(s) 102 or for executing the descriptions, functions, procedures, proposals, methods and / or operational flows disclosed in the present document. Here, the processor(s) 102 and the memory(ies) 104 can be part of a communication modem / circuitry / chip designed to implement a RAT (e.g., LTE or NR). The transceiver(s) 106 can be connected to the processor(s) 102, and transmit and / or receive radio signals through the antenna(s) 108. Each transceiver 106 can include a transmitter and / or a receiver. The transceiver(s) 106 can be used interchangeably with Radio Frequency (RF) units. In the present disclosure, a wireless device can represent a communication modem / circuitry / chip.

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

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

[0360] One or more processors 102 and 202 can be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 can 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) can be included in one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document can be implemented using firmware or software, and the firmware or software can be configured to include modules, procedures, or functions. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document can be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 so as to be driven by one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document can be implemented using software or firmware in the form of code, commands, and / or command sets.

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

[0362] The one or more transceivers 106 and 206 can transmit user data, control information, and / or radio signals / channels mentioned in the methods and / or operational flows of the present document, to one or more other apparatuses. The one or more transceivers 106 and 206 can receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functionalities, procedures, proposals, methods, and / or operational flows disclosed in the present document, from one or more other apparatuses. For example, the one or more transceivers 106 and 206 can be connected to the one or more processors 102 and 202, and can transmit and receive radio signals. For example, the one or more processors 102 and 202 can perform control so that the one or more transceivers 106 and 206 can transmit user data, control information, or radio signals to one or more other apparatuses. The one or more processors 102 and 202 can perform control so that the one or more transceivers 106 and 206 can receive user data, control information, or radio signals from one or more other apparatuses. The one or more transceivers 106 and 206 can be connected to the one or more antennas 108 and 208, and the one or more transceivers 106 and 206 can be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functionalities, procedures, proposals, methods, and / or operational flows disclosed in the present document, through the one or more antennas 108 and 208. In the present document, the one or more antennas can be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 can convert received radio signals / channels, etc. from RF band signals to baseband signals, in order to process received user data, control information, radio signals / channels, etc. using the one or more processors 102 and 202. The one or more transceivers 106 and 206 can convert user data, control information, radio signals / channels, etc. processed using the one or more processors 102 and 202, from baseband signals to RF band signals. To do so, the one or more transceivers 106 and 206 can include (analog) oscillators and / or filters.

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

[0364] Referring to Figure 19 , the signal processing circuit (1000) can include a scrambler (1010), a modulator (1020), a layer mapper (1030), a precoder (1040), a resource mapper (1050), and a signal generator (1060). The operations / functions of Figure 19 may be performed without being limited to the processors (102, 202) and / or transceivers (106, 206) of Figure 18 . The operations / functions of Figure 18the processor (102, 202) and / or the transceiver (106, 206) of the wireless device Figure 19 The blocks 1010 to 1060 can be implemented by the processor (102, 202) of the wireless device Figure 18 The blocks 1010 to 1050 can be implemented by the processor (102, 202) of the wireless device, and the block 1060 can be implemented by the transceiver (106, 206) of the wireless device Figure 18 The blocks 1010 to 1050 can be implemented by the processor (102, 202) of the wireless device, and the block 1060 can be implemented by the transceiver (106, 206) of the wireless device Figure 18 The block 1060 can be implemented by the transceiver (106, 206) of the wireless device.

[0365] The codeword can be converted into a radio signal via the signal processing circuit (1000) of the wireless device. Herein, the codeword is a sequence of coded bits of an information block. The information block can include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal can be transmitted through various physical channels (e.g., PUSCH and PDSCH). Figure 19 Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. A scrambling sequence used for scrambling can be generated based on an initial value, and the initial value can include ID information of the wireless device. The scrambled bit sequence can be modulated into a sequence of modulation symbols by the modulator 1020. The modulation scheme can include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The sequence of complex modulation symbols can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbols of each transmission layer can be mapped (precoded) to a corresponding antenna port(s) by the precoder 1040. The output z of the precoder 1040 can be derived by multiplying the output y of the 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. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) on the complex modulation symbols. Alternatively, the precoder 1040 can perform precoding without performing transform precoding.

[0366] The resource mapper 1050 can map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources can include a plurality of symbols (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain. The signal generator 1060 can generate a radio signal from the mapped modulation symbols, and the generated radio signal can be transmitted to other devices through each antenna. To this end, the signal generator 1060 can include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0367]

[0368] ​Can be with Figure 19 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 18 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.

[0369] Figure 20 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 17 ).

[0370] Reference Figure 20 The wireless devices (100, 200) can correspond to Figure 18 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 18 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 18The 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), the memory unit (130), and the add-on components (140), and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on 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 source (e.g., another communication device) via the communication unit (110) through a wireless / wired interface, or store information received from an external source (e.g., another communication device) via the communication unit (110) through a wireless / wired interface in the memory unit (130).

[0371] 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 17 100a), vehicles ( Figure 17 100b-1 and 100b-2), XR device ( Figure 17 100c), handheld device ( Figure 17 100d), home appliances ( Figure 17 100e), IoT devices ( Figure 17 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 17 400), BS ( Figure 17 (e.g., 200), network nodes, etc. Depending on the use case / service, wireless devices can be used in mobile or fixed locations.

[0372] exist Figure 17In the wireless device (100, 200), various elements, components, units / portions, and / or modules can all be connected to each other through a wired interface, or at least part of them can be wirelessly connected through the communication unit (110). For example, in each of the wireless device (100, 200), the control unit (120) and the communication unit (110) can be connected through a wired connection, and the control unit (120) and the first unit (e.g., 130, 140) can be wirelessly connected through the communication unit (110). Each element, component, unit / portion, and / or module within the wireless device (100, 200) can further include one or more elements. For example, the control unit (120) can be configured by a set of one or more processors. As an example, the control unit (120) can be configured by a set of communication control processor, application processor, electronic control unit (ECU), graphic processing unit, and memory control processor. As another example, the memory unit (130) can be configured by a set of random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0373] Hereinafter, examples of implementing the above-described Figure 20 will be described in detail with reference to the accompanying drawings.

[0374] Figure 20 A hand-held device according to an embodiment of the disclosure is illustrated. The hand-held device can include a smart phone, a smart pad, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The hand-held device can be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0375] Referring to Figure 21 , the hand-held device (100) can 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) can be configured as a part of the communication unit (110). Blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130 / 140 of Figure 21 , respectively.

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

[0377] For example, in the case of data communication, the I / O unit 140c can acquire information / signals (e.g., touch, text, voice, image, or video) input by a user, and the acquired information / signals can be stored in the memory unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals and transmit the converted radio signals directly to other wireless devices or to a BS. The communication unit 110 can receive radio signals from other wireless devices or a BS, and then restore the received radio signals to original information / signals. The restored information / signals can be stored in the memory unit 130 and can be output as various types (e.g., text, voice, image, video, or haptic) through the I / O unit 140.

[0378] Figure 20 A vehicle or autonomous vehicle according to an embodiment of the disclosure is illustrated. The vehicle or autonomous vehicle can be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0379] Referring to Figure 22 The vehicle or autonomous vehicle (100) can include an antenna unit (108), a communication unit (110), a control unit (120), a driving unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) can be configured as a part of the communication unit (110). The blocks 110 / 130 / 140a to 140d correspond to the blocks 110 / 130 / 140 of Figure 22 Figure 20 , respectively.

[0380] The communication unit 110 can transmit and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and road side units), and servers. The control unit 120 can perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The control unit 120 can include an electronic control unit (ECU). The driving unit 140a can cause the vehicle or the autonomous vehicle 100 to travel on a road. The driving unit 140a can include an engine, a motor, a transmission system, a wheel, a brake, a steering device, etc. The power supply unit 140b can supply power to the vehicle or the autonomous vehicle 100, and can include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can acquire vehicle states, external environment information, user information, etc. The sensor unit 140c can include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement a technology for maintaining a lane in which the vehicle travels, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path when a destination is set, etc.

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

[0382] The claims in the specification can be combined in various ways. For example, the technical features in the method claims of the specification can be combined to be implemented or executed in an apparatus, and the technical features in the apparatus claims can be combined to be implemented or executed in a method. In addition, the technical features in the method claim(s) and the technical features in the apparatus claim(s) can be combined to be implemented or executed in an apparatus. In addition, the technical features in the method claim(s) and the technical features in the apparatus claim(s) can be combined to be implemented or executed in a method.

Claims

1. A method for performing wireless communication by a first device, the method comprising the steps of: Obtain the resource reservation period value for the resource pool; Confirm selection window; Select Y candidate time slots within the selection window; Partial sensing is performed for multiple time slots, and the multiple time slots are periodically spaced from each of the Y candidate time slots by the resource reservation period value; Based on the partial sensing, at least one SL resource is selected from the sidelink SL resources included in the Y candidate time slots; and SL communication is performed based on the at least one SL resource. Where the value of Y is a positive integer.

2. The method according to claim 1, further comprising the following steps: The value of Y is determined based on the priority of the Media Access Control Protocol Data Unit (MAC PDU) to be transmitted. For each priority level, at least one candidate value of Y is configured for the first device.

3. The method according to claim 1, further comprising the following steps: The value of Y is determined based on the congestion level of the resource pool. For each congestion level, at least one candidate value for Y is configured for the first device.

4. The method according to claim 1, wherein, The Y candidate time slots were selected as those that could be notified via previous side link control information (SCI).

5. The method according to claim 1, further comprising the following step: The second device receives first side link control information (SCI), the first SCI including information related to a first priority and information related to a first resource; as well as The second SCI is received from the third device. The second SCI includes information related to the second priority and information related to the second resource. The second device is one that requires energy saving, and The third device is one that does not require power saving.

6. The method according to claim 5, further comprising the following step: Based on the overlap between the first resource and the at least one SL resource, a first RSRP threshold is used to determine whether to reselect the first resource; as well as Based on the overlap between the second resource and the at least one SL resource, a second RSRP threshold is used to determine whether to reselect the second resource. The first RSRP threshold associated with a device that requires power saving is different from the second RSRP threshold associated with a device that does not require power saving.

7. The method according to claim 5, further comprising the following step: Based on the overlap between the first resource and the at least one SL resource, a determination is made as to whether to reselect the first resource based on the information related to the first priority and the first priority threshold; and Based on the overlap between the second resource and the at least one SL resource, a determination is made as to whether to reselect the second resource, based on the information related to the second priority and the second priority threshold. The first priority threshold associated with devices that require power saving is different from the second priority threshold associated with devices that do not require power saving.

8. The method according to claim 5, further comprising the following step: Based on the overlap between the first resource and the at least one SL resource, a determination is made whether to reselect the first resource based on information related to a third priority, wherein the information related to the third priority is a value obtained by applying a priority offset value to a first priority threshold associated with a device requiring power saving; and Based on the overlap between the second resource and the at least one SL resource, it is determined whether to reselect the second resource based on the information related to the second priority.

9. The method according to claim 5, wherein, The first SCI includes information indicating a power-saving device.

10. The method according to claim 1, wherein, Since resource selection based on full sensing is not allowed for the resource pool, the first device is not allowed to perform a re-evaluation operation or a preemption operation on the resource pool.

11. The method according to claim 1, further comprising the following step: Sensing is performed on the N time slots preceding the first time slot among the Y candidate time slots. Where N is a positive integer.

12. The method according to claim 11, wherein, Based on the disallowing of periodic resource reservations for the resource pool, the sensing is performed for the N time slots preceding the first time slot among the Y candidate time slots.

13. A first means configured to perform wireless communication, the first means comprising: At least one transceiver; At least one processor; as well as At least one memory, connected to the at least one processor and storing instructions that, upon execution, cause the first device to perform operations, the operations including: Obtain the resource reservation period value for the resource pool; Confirm selection window; Select Y candidate time slots within the selection window; Partial sensing is performed for multiple time slots, and the multiple time slots are periodically spaced from each of the Y candidate time slots by the resource reservation period value; Based on the partial sensing, at least one SL resource is selected from the sidelink SL resources included in the Y candidate time slots; and SL communication is performed based on the at least one SL resource. Where the value of Y is a positive integer.

14. A processing apparatus configured to control a first device, the processing apparatus comprising: At least one processor; as well as At least one memory, connected to the at least one processor and storing instructions that, upon execution, cause the first device to perform operations, the operations including: Obtain the resource reservation period value for the resource pool; Confirm selection window; Select Y candidate time slots within the selection window; Partial sensing is performed for multiple time slots, and the multiple time slots are periodically spaced from each of the Y candidate time slots by the resource reservation period value; Based on the partial sensing, at least one SL resource is selected from the sidelink SL resources included in the Y candidate time slots; and SL communication is performed based on the at least one SL resource. Where the value of Y is a positive integer.

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