Method and apparatus for operating resource selection and HARQ operation in NR V2X

Abstract

The invention provides a method and a device for operating resource selection and HARQ (Hybrid Automatic Repeat Request) operation in NR V2X. A method of performing wireless communication by a first device is presented. The method may comprise the steps of: receiving a configured grant (CG) from a base station, wherein the CG includes information on a physical uplink control channel (PUCCH) resource associated with a sidelink; transmitting a physical sidelink control channel (PSCCH) to the second device based on the CG; transmitting a physical side link shared channel (PSSCH) associated with the PSCCH to the second device based on the CG, in which SL Hybrid Automatic Repeat Request (HARQ) feedback is disabled; and transmitting an acknowledgement (ACK) to the base station via the PUCCH resource based on the retransmission associated with the PSSCH has not been requested.

Description

[0001] This application is a divisional application of a patent application with application number 202180014047.1 (PCT / KR2021 / 001883) filed on August 11, 2022, application date on February 15, 2021, and titled “Method and device for operation resource selection and HARQ operation in NR V2X”. Technical Field

[0002] The present disclosure relates to wireless communication systems. Background Art

[0003] Sidelink (SL) communication is a communication scheme in which a direct link is established between user equipments (UEs) and the UEs directly exchange voice and data with each other without intervention of an evolved Node B (eNB). SL communication is being considered as a solution to eNB overhead caused by the rapid growth of data traffic.

[0004] V2X (Vehicle to Everything) refers to the communication technology used by vehicles to exchange information with other vehicles, pedestrians, and objects equipped with infrastructure. 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). V2X communication can be provided through the PC5 interface and / or the Uu interface.

[0005] At the same time, since a wider range of communication devices requires a larger communication capacity, the demand for stronger mobile broadband communication than the existing radio access technology (RAT) is increasing. Therefore, user equipment (UE) or services that are sensitive to reliability and latency are discussed. And the next generation of radio access technology based on enhanced mobile broadband communication, massive MTC, and ultra-reliable low-latency communication (URLLC) can be called a new radio access technology (RAT) or a new radio (NR). Here, NR can also support vehicle-to-everything (V2X) communication.

[0006] Figure 1 is a diagram for describing NR-based V2X communication compared with V2X communication based on a RAT used before NR. Figure 1 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0007] Regarding V2X communication, when discussing the RAT used before NR, the focus is on the scheme of providing safety services based on V2X messages such as BSM (Basic Safety Message), CAM (Cooperative Awareness Message) and DENM (Decentralized Environment Notification Message). V2X messages may include location information, dynamic information, attribute information, etc. For example, a UE may send a periodic message type CAM and / or an event-triggered message type DENM to another UE.

[0008] For example, the CAM may include dynamic state information of the vehicle such as direction and speed, static data of the vehicle such as size, and basic vehicle information such as external lighting status, route details, etc. For example, the UE may broadcast the CAM, and the latency of the CAM may be less than 100 ms. For example, the UE may generate a DENM and send it to another UE in an unexpected situation such as a vehicle breakdown, accident, etc. For example, all vehicles within the transmission range of the UE can receive the CAM and / or the DENM. In this case, the DENM may have a higher priority than the CAM.

[0009] Since then, various V2X scenarios have been proposed in NR regarding V2X communication. For example, these various V2X scenarios may include vehicle platooning, advanced driving, extended sensors, remote driving, etc.

[0010] For example, based on vehicle platooning, vehicles can move together by dynamically forming groups. For example, in order to perform queuing operations based on vehicle platooning, vehicles belonging to the group can receive periodic data from the leading vehicle. For example, vehicles belonging to the group can reduce or increase the interval between vehicles by using the periodic data.

[0011] For example, based on advanced driving, the vehicles can be semi-autonomous or fully autonomous. For example, each vehicle can adjust trajectory or maneuver based on data obtained from local sensors of nearby vehicles and / or nearby logical entities. In addition, for example, each vehicle can share driving intentions with nearby vehicles.

[0012] For example, based on the extended sensors, raw data, processed data or real-time video data obtained by local sensors can be exchanged between the vehicle, the logical entity, the pedestrian UE and / or the V2X application server, so that, for example, the vehicle can recognize a further improved environment compared to the environment detected using its own sensors.

[0013] For example, based on remote driving, for a person who cannot drive or a remote vehicle in a dangerous environment, a remote driver or V2X application can operate or control the remote vehicle. For example, if the route is predictable (such as public transportation), cloud computing-based driving can be used for the operation or control of the remote vehicle. In addition, for example, access to a cloud-based backend service platform can be considered for remote driving.

[0014] In addition, a scheme for specifying service requirements for various V2X scenarios such as vehicle platooning, advanced driving, extended sensors, remote driving, etc. is discussed in NR-based V2X communications. Summary of the invention

[0015] Technical issues

[0016] Meanwhile, in NR V2X communication or NR sidelink communication, when the base station signals a mode 1 grant to the transmitting UE, associated PUCCH resources may be allocated or scheduled for the transmitting UE. Then, for example, if the transmitting UE performs transmission without requesting or receiving sidelink HARQ feedback from the receiving UE through mode 1 transmission resources, and if the transmitting UE requires additional retransmission resources, a method for requesting resources from the base station may be required. In addition, for example, if the transmitting UE performs transmission without requesting or receiving sidelink HARQ feedback from the receiving UE through mode 1 transmission resources, and if additional retransmission resources are not required, it may be necessary for the transmitting UE to notify the base station that additional retransmission resources are not required.

[0017] Technical Solution

[0018] In one embodiment, a method for performing wireless communication by a first device is provided. The method may include: receiving a configuration grant (CG) from a base station, the configuration grant (CG) including information about a physical uplink control channel (PUCCH) resource associated with a side link (SL); sending a physical side link control channel (PSCCH) to a second device based on the CG; sending a physical side link shared channel (PSSCH) associated with the PSCCH to the second device based on the CG; and sending an acknowledgment (ACK) to the base station through PUCCH resources based on SL hybrid automatic repeat request (HARQ) feedback being disabled and retransmission associated with the PSSCH being not required.

[0019] Effects of the present disclosure

[0020] A user equipment (UE) may efficiently perform SL communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a diagram for describing NR-based V2X communication compared with V2X communication based on a RAT used before NR.

[0022] Figure 2 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0023] Figure 3 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is shown.

[0024] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0025] Figure 5 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0026] Figure 6The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown.

[0027] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown.

[0028] Figure 8 A radio protocol architecture for SL communication according to an embodiment of the present disclosure is shown.

[0029] Fig. 9 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown.

[0030] Fig.10 A process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure is shown.

[0031] Fig.11 Three cast types according to embodiments of the present disclosure are shown.

[0032] Fig.12 A method in which a UE having reserved transmission resources notifies another UE of the transmission resources according to an embodiment of the present disclosure is shown.

[0033] Fig.13 A process in which a sending UE sends sidelink HARQ feedback to a base station through a PUCCH according to an embodiment of the present disclosure is shown.

[0034] Fig.14 A method for a sending UE to reselect a first transmission resource based on an embodiment of the present disclosure is shown.

[0035] Fig.15 An example is shown in which a transmitting UE reselects a first transmission resource based on an overlap between the first transmission resource and a second transmission resource to be used by other UEs according to an embodiment of the present disclosure.

[0036] Fig.16 The process of a sending UE sending sidelink HARQ feedback to a base station through a PUCCH and receiving a DG from the base station based on an embodiment of the present disclosure is shown.

[0037] Fig.17 An example is shown in which a sending UE performs retransmission using resources allocated via a CG within a preconfigured time window based on an embodiment of the present disclosure.

[0038] Fig.18 A process of sending ACK to a base station based on a DG received by a sending UE according to an embodiment of the present disclosure is shown.

[0039] Fig.19A method for a first device to send sidelink HARQ feedback to a base station through a PUCCH based on an embodiment of the present disclosure is shown.

[0040] Fig. 20 A method in which a first device sends SCI to a second device through a PSCCH or a PSSCH related to the PSCCH according to an embodiment of the present disclosure is shown.

[0041] Fig.21 A communication system 1 according to an embodiment of the present disclosure is shown.

[0042] Fig. 22 A wireless device according to an embodiment of the present disclosure is shown.

[0043] Fig.23 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0044] Fig.24 Another example of a wireless device according to an embodiment of the present disclosure is shown.

[0045] Fig.25 A handheld device according to an embodiment of the present disclosure is shown.

[0046] Fig.26 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0047] In this specification, "A or B" may mean "only A", "only B", or "both A and B". In other words, in this specification, "A or B" may be interpreted as "A and / or B". For example, in this specification, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, C".

[0048] A slash ( / ) or a comma used in this specification may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0049] In the present specification, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, in the present specification, the expression "at least one of A or B" or "at least one of A and / or B" may be interpreted as "at least one of A and B".

[0050] In addition, in the present specification, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". In addition, "at least one of A, B, or C" or "at least one of A, B and / or C" may mean "at least one of A, B, and C".

[0051] In addition, brackets used in this specification may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean that "PDCCH" is proposed as an example of "control information". In other words, the "control information" of this specification is not limited to "PDCCH", and "PDDCH" may be proposed as an example of "control information". Specifically, when indicated as "control information (ie, PDCCH)", this may also mean that "PDCCH" is proposed as an example of "control information".

[0052] The technical features respectively described in one drawing in this specification may be implemented separately or may be implemented simultaneously.

[0053] The techniques described below may be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA may be implemented using a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA may be implemented using a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented using a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. IEEE802.16m is an evolved version of IEEE 802.16e and provides backward compatibility for systems based on IEEE 802.16e. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) that uses E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (LTE-A) is an evolution of LTE.

[0054] 5G NR is a subsequent technology of LTE-A corresponding to a new mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can use all available spectrum resources including low frequency bands less than 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequency bands above 24 GHz (millimeter waves).

[0055] For the sake of clarity, the following description will mainly focus on LTE-A or 5G NR. However, the technical features of the embodiments of the present disclosure are not limited thereto.

[0056] Figure 2 The structure of the NR system according to an embodiment of the present disclosure is shown. Figure 2 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0057] Reference Figure 2 , the next generation radio access network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol terminations to the UE 10. For example, the BS 20 may include a next generation Node B (gNB) and / or an evolved Node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. For example, the BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to by other terms such as a base transceiver system (BTS), an access point (AP), etc.

[0058] Figure 2 The embodiment illustrates a case where only gNB is included. The BSs 20 may be connected to each other via an Xn interface. The BSs 20 may be connected to each other via a fifth generation (5G) core network (5GC) and an NG interface. More specifically, the BSs 20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a user plane function (UPF) 30 via an NG-U interface.

[0059] Figure 3 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is shown. Figure 3 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0060] Reference Figure 3, gNB can provide functions such as inter-cell radio resource management (inter-cell RRM), radio bearer (RB) control, connection mobility control, radio admission control, measurement configuration and provision, dynamic resource allocation, etc. AMF can provide functions such as non-access stratum (NAS) security, idle state mobility processing, etc. UPF can provide functions such as mobility anchoring, protocol data unit (PDU) processing, etc. Session management function (SMF) can provide functions such as user equipment (UE) Internet protocol (IP) address allocation, PDU session control, etc.

[0061] The radio interface protocol layer between the UE and the network can be classified into the first layer (L1), the second layer (L2), and the third layer (L3) based on the lower three layers of the open system interconnection (OSI) model known in the communication system. Here, 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.

[0062] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 4 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4 (a) shows the radio protocol architecture for the user plane, and Figure 4 (b) in FIG. 4 shows a radio protocol architecture for a control plane. The user plane corresponds to a protocol stack for user data transmission, and the control plane corresponds to a protocol stack for control signal transmission.

[0063] Reference Figure 4 , the physical layer provides information transfer services to the upper layer through the physical channel. The physical layer is connected to the media access control (MAC) layer, which is the upper layer of the physical layer, through the transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how the data is transmitted through the radio interface and what characteristics of the data it transmits.

[0064] Between different PHY layers (ie, the PHY layer of the transmitter and the PHY layer of the receiver), data is transferred through a physical channel. The physical channel may be modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and the physical channel uses time and frequency as radio resources.

[0065] The MAC layer provides services to the Radio Link Control (RLC) layer, which is a higher layer of the MAC layer, via logical channels. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transfer services through logical channels.

[0066] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). In order to ensure different Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three types of operation modes, namely, Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction through Automatic Repeat Request (ARQ).

[0067] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer performs functions related to the configuration, reconfiguration, and release of radio bearers for controlling physical channels, transport channels, and logical channels. RB refers to a logical path provided by the first layer (ie, the PHY layer) and the second layer (ie, the MAC layer, the RLC layer, and the Packet Data Convergence Protocol (PDCP) layer) to transmit data between the UE and the network.

[0068] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include transmission of user data, header compression and encryption. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include transmission and encryption / integrity protection of control plane data.

[0069] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and QoS Flow ID (QFI) marking in both DL and UL packets.

[0070] Configuration of RB refers to the process for specifying the radio protocol layer and channel attributes to provide a specific service and for determining the corresponding detailed parameters and operation methods. RB can be classified into two types, namely, signaling RB (SRB) and data RB (DRB). SRB is used as a path for sending RRC messages in the control plane. DRB is used as a path for sending user data in the user plane.

[0071] When an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state, otherwise the UE may be in the RRC idle (RRC_IDLE) state. In the case of NR, an RRC inactive (RRC_INACTIVE) state is additionally defined, and the UE in the RRC_INACTIVE state may maintain the connection with the core network and release its connection with the BS.

[0072] Downlink transport channels for sending (or transmitting) data from the network to the UE include a broadcast channel (BCH) for sending system information and a downlink shared channel (SCH) for sending other user traffic or control messages. Traffic or control messages for downlink multicast or broadcast services can be sent on a downlink SCH or a separate downlink multicast channel (MCH). Data is sent from the UE to the network via an uplink transport channel. Examples of uplink transport channels include a random access channel (RACH) for sending initial control messages and an uplink SCH for sending user traffic or control messages.

[0073] Examples of logical channels belonging to a higher layer of a transport channel and mapped to the transport channel may include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

[0074] A physical channel includes several OFDM symbols in the time domain and several subcarriers in the frequency domain. One subframe includes multiple OFDM symbols in the time domain. A resource block is a unit of resource allocation and consists of multiple subcarriers and multiple OFDM symbols. In addition, each subframe may use a specific subcarrier of a specific OFDM symbol (e.g., the first OFDM symbol) of a corresponding subframe for a physical downlink control channel (PDCCH), i.e., an L1 / L2 control channel. A transmission time interval (TTI) refers to a unit time for subframe transmission.

[0075] Figure 5 The structure of the NR system according to an embodiment of the present disclosure is shown. Figure 5 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0076] Reference Figure 5In NR, a radio frame may be used to perform uplink and downlink transmissions. The length of a radio frame is 10 ms and may be defined as consisting of two half frames (HFs). A half frame may include five 1 ms subframes (SFs). A subframe (SF) may be divided into one or more slots, and the number of slots within a subframe may be determined based on a subcarrier spacing (SCS). Each slot may include 12 or 14 OFDM (A) symbols depending on a cyclic prefix (CP).

[0077] When a normal CP is used, each time slot may include 14 symbols. When an extended CP is used, each time slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or a CP-OFDM symbol) and a single carrier-FDMA (SC-FDMA) symbol (or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol).

[0078] Table 1 below shows the number of symbols (N) per time slot according to the SCS setting (u) when the normal CP is used. slot symb ), the number of time slots per frame (N frame,u slot ) and the number of time slots per subframe (N subframe,u slot ) example.

[0079] [Table 1]

[0080]

[0081] Table 2 shows an example of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS in the case of using the extended CP.

[0082] [Table 2]

[0083]

[0084] In the NR system, OFDM (A) parameter sets (e.g., SCS, CP length, etc.) may be configured differently between multiple cells integrated into one UE. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., subframe, time slot, or TTI) (collectively referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently in the integrated cells.

[0085] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, with an SCS of 15 kHz, a wide range of traditional cellular bands can be supported, and with an SCS of 30 kHz / 60 kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. With an SCS of 60 kHz or higher, bandwidths greater than 24.25 GHz can be used to overcome phase noise.

[0086] The NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values ​​of the frequency ranges may be changed (or varied), for example, the two different types of frequency ranges may be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 may mean "a range below 6 GHz", and FR2 may mean "a range above 6 GHz", and may also be referred to as millimeter wave (mmW).

[0087] [Table 3]

[0088]

[0089] As described above, the value of the frequency range in the NR system may be changed (or varied). For example, as shown in Table 4 below, FR1 may include a bandwidth in the range of 410 MHz to 7125 MHz. More specifically, FR1 may include frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 may include unlicensed bands. The unlicensed bands may be used for various purposes, for example, the unlicensed bands are used for vehicle-specific communications (e.g., autonomous driving).

[0090] [Table 4]

[0091]

[0092] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown.

[0093] Reference Figure 6 , a time slot includes multiple symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols. For example, in the case of extended CP, one time slot may include 12 symbols. Alternatively, in the case of normal CP, one time slot may include 7 symbols. However, in the case of extended CP, one time slot may include 6 symbols.

[0094] A carrier includes a plurality of subcarriers in the frequency domain. A resource block (RB) may be defined as a plurality of consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth part (BWP) may be defined as a plurality of consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP may correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier may include a maximum of N BWPs (e.g., 5 BWPs). Data communication may be performed via an activated BWP. Each element may be referred to as a resource element (RE) in a resource grid, and a complex symbol may be mapped to each element.

[0095] Meanwhile, the radio interface between a UE and another UE or the radio interface between a UE and a network may include an L1 layer, an L2 layer, and an L3 layer. In various embodiments of the present disclosure, the L1 layer may refer to a physical layer. In addition, for example, the L2 layer may refer to at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. In addition, for example, the L3 layer may refer to an RRC layer.

[0096] Hereinafter, a bandwidth part (BWP) and a carrier will be described in detail.

[0097] A BWP may be a contiguous set of physical resource blocks (PRBs) within a given parameter set. A PRB may be selected from a contiguous subset of common resource blocks (CRBs) for a given parameter set on a given carrier.

[0098] When bandwidth adaptation (BA) is used, the reception bandwidth and transmission bandwidth of the user equipment (UE) are not required to be as wide (or large) as the bandwidth of the cell, and the reception bandwidth and transmission bandwidth of the UE can be controlled (or adjusted). For example, the UE can receive information / configuration for bandwidth control (or adjustment) from the network / base station. In this case, bandwidth control (or adjustment) can be performed based on the received information / configuration. For example, bandwidth control (or adjustment) can include reduction / expansion of bandwidth, change of location of bandwidth, or change of subcarrier spacing of bandwidth.

[0099] For example, the bandwidth may be reduced during a duration of little activity in order to save power. For example, the location of the bandwidth may be moved in the frequency domain. For example, the location of the bandwidth may be moved in the frequency domain to increase scheduling flexibility. For example, the subcarrier spacing of the bandwidth may be changed. For example, the subcarrier spacing of the bandwidth may be changed to allow different services to be performed. A subset of the total cell bandwidth of a cell may be referred to as a bandwidth part (BWP). BA may be performed when the base station / network configures a BWP for the UE and when the base station / network notifies the UE of the BWP that is currently active among the BWPs. 1

[0101] For example, the BWP may be at least any one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor the downlink radio link quality in a DL BWP other than an activated DL BWP on a primary cell (PCell). For example, the UE may not receive a PDCCH, a physical downlink shared channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) other than an activated DL BWP. For example, the UE may not trigger a channel state information (CSI) report for an unactivated DL BWP. For example, the UE may not send a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) other than an activated UL BWP. For example, in the case of a downlink, the initial BWP may be given as a set of contiguous RBs for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by a physical broadcast channel (PBCH)). For example, in the case of an uplink, the initial BWP may be given by a system information block (SIB) for a random access procedure. For example, a default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be an initial DL BWP. To save energy, if the UE cannot detect downlink control information (DCI) during a specified period, the UE may switch the UE's active BWP to the default BWP. 2

[0103] At the same time, BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting UE can send a SL channel or a SL signal within a specific BWP, and a receiving UE can receive a SL channel or a SL signal within the same specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have configuration signaling separate from the Uu BWP. For example, the UE can receive a configuration for the SL BWP from the base station / network. The SL BWP can be (pre-)configured for out-of-coverage NR V2X UEs and RRC_IDLE UEs. For UEs operating in RRC_CONNECTED mode, at least one SL BWP can be activated within the carrier. 3

[0105] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown. Figure 7 The embodiments of can be combined with various embodiments of the present disclosure. Assume that Figure 7 In the embodiment, the number of BWPs is 3.

[0106] Reference Figure 7, a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier frequency band to the other end thereof. Additionally, a PRB may be a resource block numbered within each BWP. Point A may indicate a common reference point of the resource block grid.

[0107] It can be obtained by point A, the offset relative to point A (N start BWP ) and bandwidth (N size BWP ) to configure the BWP. For example, point A may be an external reference point of the PRBs of the carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) are aligned in point A. For example, the offset may be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth may be the number of PRBs within a given parameter set.

[0108] Hereinafter, V2X or SL communication will be described.

[0109] Figure 8 A radio protocol architecture for SL communication according to an embodiment of the present disclosure is shown. Figure 8 The embodiments of can be combined with various embodiments of the present disclosure. More specifically, Figure 8 (a) shows the user plane protocol stack, and Figure 8 (b) in FIG. 5 shows the control plane protocol stack.

[0110] Hereinafter, the side link synchronization signal (SLSS) and the synchronization information will be described in detail.

[0111] The SLSS may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a sidelink primary synchronization signal (S-PSS), and the SSSS may be referred to as a sidelink secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquiring detailed synchronization and for detecting a synchronization signal ID.

[0112] The physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information that the UE must first know before SL signal transmission / reception. For example, the default information may be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to resource pool, type of application related to SLSS, subframe offset, broadcast information, etc. For example, in order to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH may be 56 bits, including a 24-bit cyclic redundancy check (CRC). 4

[0114] S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sidelink synchronization signal block (S-SSB)). The S-SSB can have the same parameter set (i.e., SCS and CP length) as the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in the carrier, and the transmission bandwidth can exist within the (pre-) configured sidelink (SL) BWP. For example, the S-SSB can have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH can exist across 11 RBs. In addition, the frequency position of the S-SSB can be (pre-) configured. Therefore, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0115] Fig. 9 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown. Fig. 9 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0116] Reference Fig. 9 In V2X or SL communication, the term "UE" may generally refer to a user's UE. However, if a network device such as a BS transmits / receives signals according to a communication scheme between UEs, the BS may also be regarded as a type of UE. For example, UE 1 may be a first device 100, and UE 2 may be a second device 200.

[0117] For example, UE 1 may select a resource unit corresponding to a specific resource in a resource pool meaning a set of resource series. In addition, UE 1 may send an SL signal by using the resource unit. For example, a resource pool in which UE 1 can send a signal may be configured to UE 2 as a receiving UE, and a signal of UE 1 may be detected in the resource pool.

[0118] Herein, if UE 1 is within the connection range of the BS, the BS may inform the resource pool to UE 1. Otherwise, if UE 1 is out of the connection range of the BS, another UE may inform UE 1 of the resource pool, or UE 1 may use a preconfigured resource pool.

[0119] 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.

[0120] Hereinafter, resource allocation in SL will be described.

[0121] Fig.10 A process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure is shown. Fig.10 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for ease of explanation, in LTE, the transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

[0122] For example, Fig.10 (a) in FIG. 1 shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Fig.10 (a) in FIG. 4 shows UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to conventional SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0123] For example, Fig.10 (b) in FIG. 4 shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Fig.10 (b) in FIG. 1 shows UE operation related to NR resource allocation mode 2.

[0124] Reference Fig.10 In (a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS may schedule SL resources to be used by the UE for SL transmission. For example, the BS may perform resource scheduling for UE 1 through PDCCH (more specifically, downlink control information (DCI)), and UE 1 may perform V2X or SL communication for UE 2 according to the resource scheduling. For example, UE 1 may send sidelink control information (SCI) to UE 2 through a physical sidelink control channel (PSCCH), and thereafter send data based on the SCI to UE 2 through a physical sidelink shared channel (PSSCH).

[0125] Reference Fig.10In (b), in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the BS / network or the pre-configured SL resources. For example, the configured SL resources or the pre-configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources in the configured resource pool. For example, the UE can autonomously select resources within the selection window by performing a sensing and resource (re)selection process. For example, sensing can be performed in units of subchannels. In addition, UE 1, which has autonomously selected resources in the resource pool, can send SCI to UE 2 via PSCCH, and thereafter data based on the SCI can be sent to UE 2 via PSSCH.

[0126] Fig.11 Three playback types according to an embodiment of the present disclosure are shown. Fig.11 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig.11 (a) shows broadcast type SL communication, Fig.11 (b) shows unicast type SL communication, and Fig.11 (c) in the figure shows a multicast SL communication. In the case of a unicast SL communication, the UE can perform a one-to-one communication with another UE. In the case of a multicast SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, the SL multicast communication may be replaced by SL multicast communication, SL one-to-many communication, and the like.

[0127] Meanwhile, in the present disclosure, for example, a transmitting UE (TX UE) may be a UE that transmits data to a (target) receiving UE (RX UE). For example, the TX UE may be a UE that performs PSCCH transmission and / or PSSCH transmission. Additionally / alternatively, for example, the TX UE may be a UE that transmits a SL CSI-RS and / or a SL CSI report request indicator to a (target) RX UE. Additionally / alternatively, for example, the TX UE may be a UE that transmits a (control) channel (e.g., PSCCH, PSSCH, etc.) and / or a reference signal on a (control) channel (e.g., DM-RS, CSI-RS, etc.) for use in a SL radio link monitoring (RLM) operation and / or a SL radio link failure (RFL) operation of a (target) RX UE.

[0128] Meanwhile, in the present disclosure, for example, a receiving UE (RX UE) may be a UE that sends SL HARQ feedback to a transmitting UE (TX UE) based on whether decoding of data received from the TX UE is successful and / or detection / decoding of a PSCCH (related to PSSCH scheduling) sent by the TX UE is successful. Additionally / alternatively, for example, the RX UE may be a UE that performs SL CSI transmission to the TX UE based on a SL CSI-RS and / or a SL CSI report request indicator received from the TX UE. Additionally / alternatively, for example, the RX UE is a UE that sends to the TX UE a SL (L1) reference signal received power (RSRP) measurement value measured based on a SL (L1) RSRP report request indicator and / or a (predefined) reference signal received from the TX UE. Additionally / alternatively, for example, the RX UE may be a UE that sends data of the RX UE to the TX UE. Additionally / alternatively, for example, the RX UE may be a UE that performs a SL RLM operation and / or a SL RLF operation based on a (pre-configured) (control) channel and / or a reference signal on a (control) channel received from the TX UE.

[0129] Meanwhile, in the present disclosure, for example, in the case where the RX UE sends SL HARQ feedback information for the PSSCH and / or PSCCH received from the TX UE, the following options or some of the following options may be considered. Here, for example, the following options or some of the following options may be restrictively applied only when the RX UE successfully decodes / detects the PSCCH scheduling the PSSCH.

[0130] (1) Multicast Option 1: No Acknowledgement (NACK) information can be sent to the TX UE only when the RX UE fails to decode / receive the PSSCH received from the TX UE.

[0131] (2) Multicast Option 2: If the RX UE successfully decodes / receives the PSSCH received from the TX UE, ACK information may be sent to the TX UE, and if the RX UE fails to decode / receive the PSSCH, NACK information may be sent to the TX UE.

[0132] Meanwhile, in the present disclosure, for example, the TX UE may send the following information or some of the following information to the RX UE through the SCI. Herein, for example, the TX UE may send the following information or some of the following information to the RX UE through the first SCI and / or the second SCI.

[0133] - PSSCH (and / or PSCCH) related resource allocation information (e.g., location / number of time / frequency resources, resource reservation information (e.g., time period))

[0134] - SL CSI report request indicator or SL (L1) reference signal received power (RSRP) (and / or SL (L1) reference signal received quality (RSRQ) and / or SL (L1) reference signal strength indicator (RSSI)) report request indicator

[0135] - SL CSI transmission indicator (or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) information transmission indicator) (on PSSCH)

[0136] - Modulation and Coding Scheme (MCS) information

[0137] - TX power information

[0138] - L1 destination ID information and / or L1 source ID information

[0139] - SL HARQ process ID information

[0140] - New Data Indicator (NDI) information

[0141] - Redundancy Version (RV) information

[0142] -QoS information (related to the transmission service / packet) (e.g. priority information)

[0143] - Information on the number of antenna ports used for (transmitting) SL CSI-RS or SL CSI-RS transmission indicator

[0144] - The location (or distance range) information of the target RX UE (for which SL HARQ feedback is requested) or the TX UE location information

[0145] - Reference signal (e.g., DM-RS, etc.) information related to decoding (and / or channel estimation) of data transmitted through the PSSCH. For example, information related to the pattern of (time-frequency) mapping resources of the DM-RS, rank information, antenna port index information, information about the number of antenna ports, etc.

[0146] Meanwhile, in the present disclosure, for example, since the TX UE can send the SCI, the first SCI and / or the second SCI to the RX UE through the PSCCH, the PSCCH can be replaced / replaced with the SCI and / or the first SCI and / or the second SCI. Additionally / alternatively, the SCI can be replaced / replaced with the PSCCH and / or the first SCI and / or the second SCI. Additionally / alternatively, for example, since the TX UE can send the second SCI to the RX UE through the PSSCH, the PSSCH can be replaced / replaced with the second SCI.

[0147] Meanwhile, 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 first SCI including the first SCI configuration field group may be referred to as the first SCI, and the second SCI including the second SCI configuration field group may be referred to as the second SCI. In addition, for example, the first SCI may be transmitted to the receiving UE via the PSCCH. In addition, for example, the second SCI may be transmitted to the receiving UE via the (independent) PSCCH or may be carried and transmitted together with the data via the PSSCH.

[0148] Furthermore, in the present disclosure, for example, the term “configuration / configured” or the term “defined / defined” may refer to (pre-)configuration (for each resource pool) from a base station or a network (through predefined signaling (eg, SIB, MAC, RRC, etc.)).

[0149] Meanwhile, in the present disclosure, for example, since the RLF may be determined based on the out-of-sync (OOS) indicator or the out-of-sync (IS) indicator, the RLF may be replaced / replaced with the out-of-sync (OOS) indicator or the in-sync (IS) indicator.

[0150] Meanwhile, in the present disclosure, for example, RB may be replaced / replaced by a subcarrier. In addition, in the present disclosure, for example, a packet or a service may be replaced / replaced by a TB or a MAC PDU based on a transmission layer.

[0151] Meanwhile, in the present disclosure, CBG may be replaced / replaced by TB.

[0152] Meanwhile, in the present disclosure, for example, a source ID may be replaced / replaced by a destination ID.

[0153] Meanwhile, in the present disclosure, for example, the L1 ID may be replaced / replaced by the L2 ID. For example, the L1 ID may be the L1 source ID or the L1 destination ID. For example, the L2 ID may be the L2 source ID or the L2 destination ID.

[0154] At the same time, in the present disclosure, for example, the operation of the sending UE reserving / selecting / determining retransmission resources may include: the operation of the sending UE reserving / selecting / determining potential retransmission resources whose actual use will be determined based on the SL HARQ feedback information received from the receiving UE.

[0155] Meanwhile, in the present disclosure, the sub-selection window may be replaced / substituted with the selection window and / or a preconfigured number of resource sets within the selection window, or vice versa.

[0156] Meanwhile, in the present disclosure, SL MODE 1 may refer to a resource allocation method or a communication method in which a base station directly schedules SL transmission resources for a TX UE through predefined signaling (e.g., DCI or RRC message). For example, SL MODE 2 may refer to a resource allocation method or a communication method in which a UE independently selects SL transmission resources from a resource pool preconfigured or configured by a base station or a network. For example, a UE that performs SL communication based on SL MODE 1 may be referred to as a MODE 1 UE or a MODE 1 TX UE, and a UE that performs SL communication based on SL MODE 2 may be referred to as a MODE 2 UE or a MODE 2 TX UE.

[0157] Meanwhile, in the present disclosure, for example, a dynamic grant (DG) may be replaced / replaced by a configuration grant (CG) and / or a semi-persistent scheduling (SPS) grant, or vice versa. For example, the DG may be replaced / replaced by a combination of a CG and an SPS grant, or vice versa. For example, the CG may include at least one of a configuration grant (CG) type 1 and / or a configuration grant (CG) type 2. For example, in CG type 1, the grant may be provided by RRC signaling and may be stored as a configuration grant. For example, in CG type 2, the grant may be provided by PDCCH and may be stored or deleted as a configuration grant based on L1 signaling indicating the enabling or disabling of the grant.

[0158] In addition, in the present disclosure, a channel may be replaced / replaced with a signal, or vice versa. For example, the sending / receiving of a channel may include the sending / receiving of a signal. For example, the sending / receiving of a signal may include the sending / receiving of a channel. In addition, for example, the play may be replaced / replaced with at least one of unicast, multicast and / or broadcast, or vice versa. For example, the play type may be replaced / replaced with at least one of unicast, multicast and / or broadcast, or vice versa.

[0159] Furthermore, in the present disclosure, a resource may be exchanged / replaced with a time slot or a symbol, or vice versa. For example, a resource may include a time slot and / or a symbol.

[0160] Meanwhile, in the present disclosure, priority may be replaced / replaced with at least one of logical channel priority (LCP), latency, reliability, minimum required communication range, per packet priority (PPPP), side link radio bearer (SLRB), QoS profile, QoS parameters and / or requirements, or vice versa.

[0161] Meanwhile, in various embodiments of the present disclosure, the reserved resources and / or the selected resources may be replaced / replaced with a sidelink grant (SLGRANT).

[0162] Meanwhile, in various embodiments of the present disclosure, the delay may be replaced / substituted with a packet delay budget (PDB).

[0163] Meanwhile, in various embodiments of the present disclosure, a message for triggering a report on sidelink channel state information / sidelink channel quality information (hereinafter referred to as SL_CSI information) may be replaced / replaced with a sidelink channel state information reference signal (CSI-RS) reception.

[0164] Meanwhile, in the present disclosure, blind retransmission may refer to the TX UE performing retransmission without receiving SL HARQ feedback information from the RX UE. For example, retransmission based on SL HARQ feedback may refer to the TX UE determining whether to perform retransmission based on the SL HARQ feedback information received from the RX UE. For example, if the TX UE receives NACK and / or DTX information from the RX UE, the TX UE may perform retransmission to the RX UE.

[0165] Furthermore, in the present disclosure, for example, for convenience of description, a (physical) channel used when the RX UE transmits at least one of the following information to the TX UE may be referred to as a PSFCH.

[0166] - SL HARQ feedback, SL CSI, SL (L1) RSRP

[0167] Meanwhile, in the present disclosure, the Uu channel may include a UL channel and / or a DL channel. For example, the UL channel may include a PUSCH, a PUCCH, a sounding reference signal (SRS), etc. For example, the DL channel may include a PDCCH, a PDSCH, a PSS / SSS, etc. For example, the SL channel may include a PSCCH, a PSSCH, a PSFCH, a PSBCH, a PSSS / SSSS, etc.

[0168] Meanwhile, in the present disclosure, the sidelink information may include at least one of a sidelink message, a sidelink packet, a sidelink service, a sidelink data, a sidelink control information and / or a sidelink transport block (TB). For example, the sidelink information may be transmitted via PSSCH and / or PSCCH.

[0169] Meanwhile, in NR V2X communication or NR sidelink communication, the transmitting UE may reserve / select one or more transmission resources for sidelink transmission (e.g., initial transmission and / or retransmission), and the transmitting UE may send information about the location of the one or more transmission resources to the receiving UE.

[0170] Meanwhile, when sidelink communication is performed, a method in which a transmitting UE reserves or predetermines transmission resources for a receiving UE may be representatively as follows.

[0171] For example, the transmitting UE may perform the reservation of transmission resources based on the chain. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE may send the location information of less than K transmission resources to the receiving UE through the SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, for example, the SCI may include the location information of less than K transmission resources. Alternatively, for example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE may send the location information of less than K transmission resources to the receiving UE through the SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI may include the location information of less than K transmission resources. In this case, for example, by signaling the location information of less than K transmission resources to the receiving UE only via one SCI sent by the transmitting UE at any (or specific) transmission time or time resource, performance degradation caused by excessive increase in the payload of the SCI can be prevented.

[0172] Fig.12 A method in which a UE having reserved transmission resources notifies another UE of the transmission resources according to an embodiment of the present disclosure is shown. Fig.12 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0173] Specifically, for example, Fig.12 (a) shows a method for performing chain-based resource reservation by a transmitting UE by sending / signaling location information of (maximum) 2 transmission resources to a receiving UE via one SCI in the case of a value of K=4. For example, Fig.12 (b) shows a method for performing chain-based resource reservation by a transmitting UE by sending / signaling location information of (maximum) 3 transmission resources to a receiving UE via one SCI in the case of a value of K=4. Fig.12 (a) and (b), the transmitting UE may transmit / signal only the location information of the fourth transmission-related resources to the receiving UE via the fourth (or last) transmission-related PSCCH. Fig.12(a), the transmitting UE may transmit / signal not only the location information of the fourth transmission-related resources but also the location information of the third transmission-related resources to the receiving UE via the fourth (or last) transmission-related PSCCH. Fig.12 (b), the transmitting UE may transmit / signal not only the location information of the fourth transmission-related resources but also the location information of the second transmission-related resources and the location information of the third transmission-related resources to the receiving UE via the fourth (or last) transmission-related PSCCH. In this case, for example, Fig.12 In (a) and (b), if the transmitting UE can transmit / signal only the location information of the fourth transmission-related resources to the receiving UE through the fourth (or last) transmission-related PSCCH, the transmitting UE can set or specify the field / bit of the location information of the unused or remaining transmission resources to a preconfigured value (e.g., 0). Fig.12 In (a) and (b), if the transmitting UE can send / signal only the location information of the fourth transmission-related resources to the receiving UE through the fourth (or last) transmission-related PSCCH, the transmitting UE can set or designate the field / bit of the location information of the unused or remaining transmission resources to a preconfigured state / bit value indicating / representing the last transmission (among the 4 transmissions).

[0174] In addition, for example, the transmitting UE may perform reservation of transmission resources on a block basis. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE may send the location information of the K transmission resources to the receiving UE through the SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI may include the location information of the K transmission resources. For example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE may send the location information of the K transmission resources to the receiving UE through the SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI may include the location information of the K transmission resources. For example, Fig.12 (c) shows a method of performing block-based resource reservation by a transmitting UE by signaling location information of four transmission resources to a receiving UE via one SCI in the case of a value of K=4.

[0175] At the same time, Mode 1 resource allocation / scheduling may be inefficient, for example, because the base station cannot determine how many resources a Mode 1 transmitting UE needs for MAC PDU transmission with HARQ feedback disabled.

[0176] According to various embodiments of the present disclosure, when a mode 1 transmitting UE performs MAC PDU transmission with HARQ feedback disabled, if no additional retransmission resources are required, the transmitting UE can report ACK information to the base station via PUCCH resources. Here, for example, the PUCCH resources can be PUCCH resources related to the previous mode 1 resources.

[0177] At the same time, for example, due to the decoding and / or reception performance of the UE, because the size of the resource reservation period field (hereinafter referred to as RSV_BITNUM) on the SCI is limited, the mapping relationship between the reservation period value of the optional candidate resources specifically configured / allowed for the UE resource pool and the bit value of the reservation period field of the resource may be unclear.

[0178] According to various embodiments of the present disclosure, the base station / network may configure the candidate resource reservation period value that can be used / selected in the resource pool for the UE within a range not exceeding 2^{RSV_BITNUM}. In this case, for example, the candidate resource reservation period value configured for the UE may be sequentially mapped from the first candidate resource reservation period to the ascending state of the decimal value of the RSV_BITNUM bit.

[0179] At the same time, for example, the transmitting UE may perform initial transmission based on the Mode 1 CG resources, and the transmitting UE may report NACK to the base station via the CG-related PUCCH resources. Thereafter, when the transmitting UE is scheduled with retransmission resources via the DG DCI, it may be unclear when the transmitting UE can expect the retransmission resource scheduling associated with the corresponding sidelink HARQ process or when the transmitting UE can flush the associated buffer.

[0180] Alternatively, for example, the transmitting UE may perform initial transmission based on mode 1 CG resources, and the transmitting UE may report NACK to the base station through CG-related PUCCH resources. Thereafter, the transmitting UE may perform retransmission based on the DG DCI received from the base station. At this time, for example, when the transmitting UE reports NACK to the base station through DG-related PUCCH resources to schedule retransmission resources, and is then scheduled with additional retransmission resources through DG DCI, it may be unclear when the transmitting UE can expect DG-based retransmission resource scheduling associated with the corresponding sidelink HARQ process or when the transmitting UE can refresh the associated buffer.

[0181] According to various embodiments of the present disclosure, DG DCI-based retransmission resources may be scheduled for a transmitting UE until a preconfigured time window starting from a CG resource of a specific period during which initial transmission is performed. For example, the transmitting UE may perform DG DCI-based retransmission on a related sidelink HARQ process starting from a CG resource of a specific period during which initial transmission is performed until a preconfigured time window. Here, for example, the related sidelink HARQ process may be a sidelink HARQ process related to an initial transmission performed by the transmitting UE through a CG resource of a specific period.

[0182] In addition, for example, after a preconfigured time window, the transmitting UE may be configured to refresh a buffer associated with the associated sidelink HARQ process, or may be configured to allow the transmitting UE to refresh a buffer associated with the associated sidelink HARQ process. Here, for example, the associated sidelink HARQ process may be a sidelink HARQ process associated with an initial transmission performed by the transmitting UE through a CG resource of a specific period. That is, for example, the transmitting UE may refresh a buffer associated with the associated sidelink HARQ process regardless of whether NACK information is received from the receiving UE.

[0183] Meanwhile, for example, after the mode 1 transmitting UE receives ACK information from the receiving UE through the PSFCH, even if the mode 1 transmitting UE reports the ACK information to the base station through the PUCCH, the mode 1 transmitting UE may receive DG DCI-scheduled retransmission resources associated with the corresponding sidelink HARQ process from the base station. In this case, it may be unclear whether the mode 1 transmitting UE should perform PSCCH / PSSCH transmission or retransmission on the retransmission resources and what information to report to the base station through the DG-related PUCCH resources.

[0184] According to various embodiments of the present disclosure, after the mode 1 transmitting UE receives ACK information from the receiving UE via the PSFCH, even if the mode 1 transmitting UE reports the ACK information to the base station via the PUCCH, based on the base station misidentifying the ACK as NACK, the mode 1 transmitting UE may receive the DG DCI scheduling retransmission resources associated with the corresponding sidelink HARQ process from the base station. In this case, for example, the mode 1 transmitting UE may not perform PSCCH / PSSCH transmission on the corresponding retransmission resources. For example, the mode 1 transmitting UE may also report the ACK information to the base station via the DG-related PUCCH resources.

[0185] Meanwhile, for example, a mode 2 transmitting UE may select a transmission resource based on sensing, and may signal reservation information related to the transmission resource through the SCI. At this time, when actual packet transmission is not performed due to reasons such as uplink / sidelink priority (UL / SL priority), LTE / NR sidelink priority, etc., if a packet transmission resource of another UE having a value greater than or equal to a preconfigured threshold overlaps with the corresponding transmission resource, it may be unclear whether to perform a preemption check and reselection of the transmission resource.

[0186] According to various embodiments of the present disclosure, when actual packet transmission is not performed on a reserved resource signaled by a transmitting UE via an SCI, based on the priority of the packet / data considered when performing sensing related to selecting the corresponding reserved resource, the transmitting UE may perform a preemption check and a resource reselection determination on the reserved resource for which actual packet transmission is not performed. Alternatively, for example, when a packet (e.g., MAC PDU) to be sent via the corresponding reserved resource is available, a preemption check and a resource reselection determination may be performed on the reserved resource signaled by the SCI. That is, for example, when a packet (e.g., MAC PDU) to be sent via the corresponding reserved resource is available, the transmitting UE may perform a preemption check and a resource reselection determination on the reserved resource signaled by the SCI.

[0187] Meanwhile, according to an embodiment of the present disclosure, the UE may be configured to perform a channel occupancy rate (CR) calculation related to the sidelink communication. For example, the UE may perform a CR calculation related to the sidelink communication.

[0188] According to an embodiment, the UE may select a transmission resource based on internal sensing. Thereafter, before the UE sends information related to the selected transmission resource to another UE via the SCI, the UE may determine whether the selected transmission resource overlaps all or part of the transmission resource of the other UE. For example, when the selected transmission resource overlaps all or part of the transmission resource of the other UE, the UE may reselect the transmission resource. For example, when the UE reselects the transmission resource, the UE may be configured so that the previously selected transmission resource is not included in the CR calculation. For example, when the UE reselects the transmission resource, the UE may be configured so that the previously selected transmission resource is included in the CR calculation.

[0189] Meanwhile, according to an embodiment of the present disclosure, a field related to the period information of the reserved resources may be defined on the SCI. For example, the SCI may include a field related to the period information of the reserved resources.

[0190] According to an embodiment, the size of the field related to the period information of the reserved resources included in the SCI may be configured as X bits. The base station or the network may configure the available or selectable candidate period values ​​in the resource pool to the UE. For example, the available or selectable candidate period values ​​in the resource pool may include more than 2 x No more than 2 of the candidate period values x For example, a base station or network can set a value within a range of no more than 2 x 2 of the candidate period values x The available or selectable candidate period values ​​in the resource pool in the range of are configured to the UE. Here, for example, the base station or the network can configure the period (for example, P1, P2, P3, ..., P N )N (for example, N < 2 x +1). In this case, for example, starting from the first cycle P1, the ascending states (for example, 0, 1, ..., 2) of the decimal values ​​of X bits can be sequentially mapped. x -1). For example, P1 can be mapped to the 0 state, P2 can be mapped to the 1 state, ..., P N Can be mapped to 2 x -1 status.

[0191] At the same time, according to an embodiment of the present disclosure, in the case of operations related to mode 1 CG and / or DG, the UE can report sidelink HARQ feedback information to the base station through a preconfigured PUCCH. Thereafter, when the base station allocates additional retransmission resources to the UE through DG, according to the following various embodiments, the UE can find the link between the CG index and / or CG resources for performing initial transmission and the retransmission resources allocated through DG. For example, when the UE reports NACK information to the base station through a preconfigured PUCCH, and the base station allocates additional retransmission resources to the UE through DG, according to the following various embodiments, by linking between the CG index and / or CG resources for performing initial transmission and the retransmission resources allocated through DG, the UE can determine the DG retransmission resources associated with the CG index and / or CG resources.

[0192] According to an embodiment, a PUCCH resource index indicator field (PRI_FD) may be defined on a DG DCI to which retransmission resources are allocated. Here, for example, PUCCH resource indexes may be allocated respectively for periodically occurring CG resources or PUCCH resources configured according to a CG resource set. Specifically, for example, when the UE performs an initial transmission based on a CG resource or CG resource set of a specific period, the UE may report a NACK to the base station through the associated PUCCH resource. In this case, the PRI_FD value on the DG DCI to which retransmission resources are allocated may be indicated by the index of the associated PUCCH resource. For example, when the UE performs an initial transmission based on a CG resource or CG resource set of a specific period, the UE may report a NACK to the base station through the PUCCH resource associated with the CG resource or CG resource set of a specific period. For example, when the associated PUCCH resource index is X, the PRI_FD value on the DG DCI to which retransmission resources are allocated may be expressed as X.

[0193] According to an embodiment, when the UE performs initial transmission through CG resources and additional retransmission resources are allocated to the UE through DG, a HARQ process ID field may be defined on the DCI related to the DG instead of the CG index field. For example, the DCI related to the DG may include a HARQ process ID field without including a CG index field indicating index information of the CG associated with the DG. Here, for example, the CG index field and the HARQ process ID field may exist on the CG DCI at the same time, and the HARQ process ID values ​​may not overlap between different CGs. For example, the CG DCI may include a CG index field and a HARQ process ID field, and the HARQ process ID values ​​may not overlap between different CGs. For example, in order to remove ambiguity about the link between CG resources and associated DG retransmission resources, it can be configured so that the HARQ process ID values ​​do not overlap between different CGs.

[0194] Meanwhile, according to an embodiment of the present disclosure, when the UE performs a preemption operation, the UE may reselect transmission resources according to the following various embodiments. For example, when the UE shares information related to the transmission resources selected or reserved by the SCI with another UE, when resources related to the transmission of relatively high priority packets overlap with the selected or reserved transmission resources, the preemption operation may be an operation of reselecting the selected or reserved resources or ignoring the transmission of the selected or reserved resources.

[0195] According to an embodiment, when packet transmission is not actually performed on a specific transmission resource shared by a UE through SCI, if the resource of a relatively high priority packet sent by another UE overlaps all or part of the specific transmission resource, the overlapping transmission resource can be reselected. For example, if there is no actual transmission packet, the reference priority of the UE's priority comparison related to the packet of another UE can be considered to be the priority of the most recently transmitted packet on the selected or reserved resource shared through SCI. Or, for example, when there is no actual transmission packet, the reference priority of the UE's priority comparison related to the packet of another UE can be the priority of the packet considered when the UE performs sensing related to the selected or reserved resource shared through SCI. Or, for example, when there is no actual transmission packet, the reference priority of the UE's priority comparison related to the packet of another UE can be considered to be the highest priority of the service related to the selected or reserved resource shared by the UE through SCI. Alternatively, for example, when there is no actual transmission packet, the reference priority of the UE's priority comparison related to the packet of another UE can be considered to be a preconfigured priority.

[0196] According to an embodiment, when packet transmission is not actually performed on a specific transmission resource shared by a UE through an SCI, if a resource of a relatively high priority packet sent by another UE overlaps with all or part of the specific transmission resource, the UE performs a release operation on the overlapping transmission resource, and the UE can reselect the actual transmission resource when the packet is generated or arrives at a buffer. For example, when packet transmission is not actually performed on a specific transmission resource shared by a UE through an SCI, if a resource of a relatively high priority packet sent by another UE overlaps with all or part of the specific transmission resource, the UE performs a cancel operation on an existing side link grant, and the UE can reselect the actual transmission resource when the packet is generated or arrives at a buffer.

[0197] According to an embodiment, when a relatively low priority packet transmission has occupied or reserved resources through an initial sensing operation, the preemption operation may be an operation in which the transmission of a relatively high priority packet occupies or reserves all or part of the resources that overlap or are occupied or reserved, thereby protecting the transmission of the relatively high priority packet. That is, for example, the RSRP threshold associated with the preemption may be configured differently from the side link RSRP threshold associated with sensing. Here, for example, the RSRP threshold associated with the preemption may include an RSRP threshold associated with the preemption trigger. Here, for example, the side link RSRP threshold associated with sensing may be a final side link RSRP threshold associated with the initial sensing or a side link RSRP threshold configured by a base station or a network.

[0198] Alternatively, for example, when a UE performing a relatively low priority packet transmission performs initial sensing, the preemption operation may be an operation in which the UE fails to detect or sense a relatively high priority packet transmission, and then the UE determines the transmission resources for the relatively high priority packet and all or part of its transmission resources overlap, thereby protecting the transmission of the relatively high priority packet. That is, for example, the RSRP threshold associated with the preemption may be configured to be the same as the sidelink RSRP threshold associated with the sensing. Here, for example, the RSRP threshold associated with the preemption may include an RSRP threshold associated with the preemption trigger. Here, for example, the sidelink RSRP threshold associated with the sensing may be a final sidelink RSRP threshold associated with the initial sensing or a sidelink RSRP threshold configured by the base station or the network.

[0199] According to an embodiment, when the UE performs resource reselection based on preemption, the UE may perform resource reselection by using the final sidelink RSRP threshold used during initial sensing. For example, the final sidelink RSRP threshold may be a value obtained by increasing the sidelink RSRP threshold (e.g., increasing the sidelink RSRP threshold by 3DB) so as to ensure that the number of candidates for selectable transmission resources is greater than or equal to the number preconfigured in the selection window or the preconfigured ratio.

[0200] Alternatively, for example, when the UE performs preemption-based resource reselection, the UE may perform resource reselection by using a sidelink RSRP threshold associated with initial sensing preconfigured from the base station or the network instead of a final sidelink RSRP threshold associated with initial sensing.

[0201] Meanwhile, according to an embodiment of the present disclosure, when the number of RBs associated with the side link BWP (BW_RBNUM) is greater than the number of RBs that can be configured as frequency resources of the resource pool (RP_RBNUM), in order to increase resource utilization, the following various embodiments may be applied. Here, for example, the RP_RBNUM value may be the product of the number of RBs constituting the subchannel (SUB_RBNUM) and the number of subchannels in the resource pool (SUB_NUM) (ie, RP_RBNUM=SUB_RBNUM X SUB_NUM). In addition, in the present disclosure, for convenience of description, the difference between BW_RBNUM and RP_RBNUM may be referred to as X_VAL.

[0202] According to an embodiment, a low-indexed subchannel may include all RBs corresponding to X_VAL. A high-indexed subchannel may include all RBs corresponding to X_VAL. For example, a preconfigured indexed subchannel may include all RBs corresponding to X_VAL. Alternatively, for example, in ascending order of indexes starting from the lowest-indexed subchannel, the subchannel may be configured to include the number of FLOOR (X_VAL / SUB_NUM) or CEILING (X_VAL / SUB_NUM) RBs. For example, in descending order of indexes from the highest-indexed subchannel, the subchannel may be configured to include the number of FLOOR (X_VAL / SUB_NUM) or CEILING (X_VAL / SUB_NUM) RBs.

[0203] For example, when the above embodiment is applied, there may be subchannels with different RB numbers in the resource pool, and the TBS value may be configured to be derived based on the subchannel of SUB_RBNUM. In addition, for example, when the size of the subchannel used between the initial transmission and the retransmission is different, the TBS value may be configured to always be derived or assumed as an initial transmission related parameter (e.g., the number of RBs, MCS). For example, the TBS value may be determined by a combination of the MCS and the number of RBs. For example, the TBS value may be configured to always be derived or assumed based on the subchannel of SUB_RBNUM to which the number of RBs is not added. Alternatively, for example, when the size of the subchannel used between the initial transmission and the retransmission is different, the TBS value may be configured to be derived or assumed based on the subchannel with the least number of RBs among the subchannels related to the initial transmission and the retransmission. Alternatively, for example, when the size of the subchannel used between the initial transmission and the retransmission is different, the TBS value may be configured to be derived or assumed based on the subchannel with the largest number of RBs among the subchannels related to the initial transmission and the retransmission. Alternatively, for example, when the size of a subchannel used between initial transmission and retransmission is different, the TBS value may be configured to be derived or assumed based on an average number of RBs of subchannels associated with the initial transmission and the retransmission.

[0204] At the same time, according to an embodiment of the present disclosure, a PDB or delay budget value related to the SL CSI report can be determined or selected through predefined signaling (e.g., PC5 RRC) between UEs. For example, T_VAL may include a PDB or delay budget related to the SL CSI report. In this case, for example, because the base station of the mode 1 UE performing the SL CSI reporting operation does not have information about the T_VAL value, the base station may not be able to allocate mode 1 resources that meet the T_VAL value. To solve this problem, for example, the mode 1 UE performing the SL CSI reporting operation can report the T_VAL information related to the SL SCI report determined or selected between a pair of UEs to the base station through predefined signaling (e.g., SL UE help information).

[0205] Meanwhile, according to an embodiment of the present disclosure, in the case of SL CSI MAC CE, the priority information signaled on the SCI and the priority information considered by a higher layer (e.g., MAC, RLC, PDCP) may be different. In this case, according to the following embodiments, PHY parameter adjustment based on congestion control (e.g., maximum allowed transmit power, allowed number of retransmissions, selectable MCS range, allowed number of RBs associated with transmission, etc.) may be performed or applied.

[0206] According to an embodiment, in the case of SL CSI MAC CE, PHY parameter adjustment based on congestion control may be applied based on priority information considered by a higher layer (e.g., MAC, RLC, PDCP) different from PSSCH / PSCCH. Alternatively, for example, PHY parameter adjustment based on congestion control may be applied based on priority information signaled on SCI.

[0207] At the same time, according to an embodiment of the present disclosure, in the case of mode 1 CG operation, the UE can perform retransmission on the initial transmission according to the following various embodiments. Here, for example, it can be configured to operate or use only one HARQ process or HARQ process ID for each CG. For example, it can be configured to operate or use only one sidelink HARQ process or HARQ process ID for each CG. For example, the number of HARQ processes or HARQ process IDs that can be operated or used for each CG and / or DG can be configured from the base station / network. For example, the maximum number of sidelink HARQ processes or HARQ process IDs that can be operated or used for each CG and / or DG can be configured from the base station / network. For example, the HARQ process ID or sidelink HARQ process ID can be configured not to overlap between the CG and the DG.

[0208] According to an embodiment, when the UE performs initial transmission on the CG resources of a specific period, the UE may perform a retransmission operation related to the initial transmission (for example, the UE may report SL HARQ feedback information to the base station through PUCCH, and retransmission resources may be allocated from the base station through DG) until the CG resources of the next cycle appear. Or, for example, when the UE performs initial transmission on the CG resources of a specific period, the UE may perform a retransmission operation related to the initial transmission until a preconfigured time window or until a preconfigured timer is completed. Or, for example, when the UE performs initial transmission on the CG resources of a specific period, the UE may perform a retransmission operation related to the initial transmission within a preconfigured number / interval (for example, the number of DG transmissions used to allocate retransmission resources, or the number of CG cycles). For example, when the above embodiment is applied, the maximum allowed number of retransmissions for each priority level of each CG may only be counted until the interval in which the retransmission operation is performed, and may be initialized again. For example, when the above embodiment is applied, the maximum allowed number of retransmissions for each CG and / or the maximum allowed number of retransmissions for each priority level may only be counted until the interval in which the retransmission operation is performed, and may be initialized again. Here, for example, when the period of performing the retransmission operation has passed, the sending UE may flush its buffer. For example, after the period of performing the retransmission operation, the sending UE may flush its buffer regardless of receiving a NACK from the receiving UE.

[0209] According to an embodiment, in the case of mode 1 CG, the base station may allocate additional retransmission resources to the sending UE through DG, and the sending UE receives ACK information from the receiving UE, so that the retransmission resources of the sending UE may be released. For example, the released retransmission resources may not appear / be invalid in the next CG cycle. In addition, for example, when the base station allocates additional retransmission resources to the sending UE through DG regarding the resources of a specific CG cycle, the retransmission resources may appear respectively for the resources of subsequent CG cycles. Or, for example, the retransmission resources may appear only for the resources of the corresponding CG cycle.

[0210] According to an embodiment, if multiple sidelink HARQ processes are operated based on CG resources, when the transmitting UE reports the sidelink HARQ feedback information to the base station through PUCCH, the transmitting UE may also report the associated sidelink HARQ process ID information. For example, if multiple sidelink HARQ processes are operated based on CG resources, the transmitting UE may report the sidelink HARQ feedback information and the sidelink HARQ process ID information to the base station through PUCCH. Here, for example, on the DG DCI for allocating retransmission resources, a CG index information field and a sidelink HARQ process ID information field may be defined. For example, the DG DCI for allocating retransmission resources may include a field related to the CG index information and a field related to the sidelink HARQ process ID information. According to another embodiment, the retransmission resources allocated by the DG DCI may be shared among multiple sidelink HARQ processes. For example, specifically, because the UE reports only 1 bit to the base station through PUCCH, when the SLHARQ feedback information related to multiple sidelink HARQ processes is bundled, the retransmission resources allocated by the DG DCI may be shared among multiple sidelink HARQ processes. For example, when the above-mentioned embodiment is applied, or when multiple sidelink HARQ processes are operated based on CG resources, the retransmission resources allocated by DG DCI can be shared among multiple sidelink HARQ processes reporting NACK (for example, it may be limited to the sidelink HARQ processes associated with the same CG). For example, specifically, because the UE reports only 1 bit to the base station through the PUCCH, it can be applied when the SL HARQ feedback information associated with multiple sidelink HARQ processes is bundled.

[0211] At the same time, according to an embodiment of the present disclosure, when a mode 1 sending UE reports the ACK information received from a receiving UE to the base station through a preconfigured PUCCH resource, due to the occurrence of an ACK-TO-NACK error, and if the base station misunderstands the ACK information as NACK information and allocates retransmission resources to the sending UE via DG, the following embodiment can be applied.

[0212] According to an embodiment, the transmitting UE may report ACK information to the base station through the PUCCH resources indicated by the DG DCI without actually performing retransmission through the retransmission resources allocated via the DG.

[0213] According to an embodiment, the transmitting UE may use the retransmission resources allocated by the DG for new TB transmission. For example, the receiving UE may distinguish whether a new TB is transmitted based on the sidelink HARQ process ID information and the NDI information about the SCI.

[0214] According to an embodiment, when the transmitting UE is configured with a PUCCH-based sidelink HARQ feedback report, even if the transmitting UE receives ACK information from the receiving UE via PSFCH, the transmitting UE may be configured not to refresh its own buffer within a preconfigured period / timer. Alternatively, for example, if the transmitting UE is configured with a PUCCH-based sidelink HARQ feedback report, even if the transmitting UE receives ACK information from the receiving UE via PSFCH, the transmitting UE may be configured not to refresh its own buffer until a DG (for allocating retransmission resources) containing the same HARQ process ID and / or CG index information and switched NDI information is received. For example, even when unnecessary retransmission resources are allocated to the transmitting UE via DG due to an ACK-TO-NACK error, in order for the transmitting UE to perform retransmission to the receiving UE, the transmitting UE may not refresh its own buffer within a preconfigured period / timer. Alternatively, the transmitting UE may not refresh its own buffer until a DG (for allocating retransmission resources) containing the same HARQ process ID and / or CG index information and switched NDI information is received.

[0215] Meanwhile, according to an embodiment of the present disclosure, when the sending UE reserves multiple retransmission resources for potential retransmission operations, the sending UE can receive ACK information from the receiving UE. At this time, if the sending UE releases the remaining retransmission resources, the sending UE can perform the counting of the number of retransmissions per TB or the number of retransmissions per priority according to the following various embodiments.

[0216] According to an embodiment, the sending UE may assume that a retransmission operation is performed on the remaining transmission retransmission resources, and the sending UE may perform a count of the number of retransmissions per TB or a count of the number of retransmissions per priority level in consideration of the released remaining transmission retransmission resources. Alternatively, for example, the sending UE may not consider the released remaining retransmission resources when counting the number of retransmissions per TB or counting the number of retransmissions per priority level. For example, because the sending UE has signaled to another UE via SCI that it has reserved the corresponding resources, the sending UE may assume that a retransmission operation is performed on the remaining transmission retransmission resources, and the sending UE may perform a count of the number of retransmissions per TB or a count of the number of retransmissions per priority level in consideration of the released remaining transmission retransmission resources.

[0217] According to another embodiment, when a sending UE fails to perform actual transmission or retransmission on resources reserved or selected for a specific TB due to a conflict between uplink transmission and / or sidelink transmission, etc., the sending UE may reflect the failure to perform actual transmission or retransmission on the reserved or selected resources when counting the number of retransmissions per TB or counting the number of retransmissions per priority. Alternatively, for example, when a sending UE fails to perform actual transmission or retransmission on resources reserved or selected for a specific TB due to a conflict between uplink transmission and / or sidelink transmission, etc., the sending UE may not reflect the failure to perform actual transmission or retransmission on the reserved or selected resources when counting the number of retransmissions per TB or counting the number of retransmissions per priority.

[0218] At the same time, according to an embodiment of the present disclosure, the total number of sidelink HARQ processes that the UE can operate (e.g., K) can be greater than the number of states that the sidelink HARQ process ID field on the SCI can indicate. In this case, according to the following various embodiments, the UE can be configured to operate the sidelink HARQ process.

[0219] According to an embodiment, when the UE is operating multiple sessions, the maximum number of sidelink HARQ processes that can be used / allocated to one session can be limited to the number of states that can be indicated by the sidelink HARQ process ID field on the SCI, or may be limited to a preconfigured maximum value.

[0220] According to an embodiment, the index associated with the entire sidelink HARQ process that the UE can operate may have a value from 0 to (K-1), but because the sidelink HARQ process index and / or the number of sidelink HARQ processes (e.g., an index from 0 to 7) that can be expressed by the sidelink HARQ HARQ process ID field (e.g., 3 bits) on the SCI is less than the index associated with the entire sidelink HARQ process that the UE can operate, the value of the sidelink HARQ process ID field on the SCI may be determined by the operation of MOD (X, 8). Here, for example, X may mean an index from 0 to (K-1). For example, MOD (A, B) may be a function that derives the remainder of A divided by B.

[0221] According to an embodiment, the mode 1 UE may report information about the total number of sidelink HARQ processes capable of operation and / or information about the soft buffer size associated with its own sidelink communication to the base station as capability information. Here, for example, the size of the HARQ process ID field on the mode 1 DCI (e.g., DG or CG) may be determined or configured based on the capability information.

[0222] According to an embodiment, if mode 1 CG operation is performed, when the UE is configured to report PUCCH-based sidelink HARQ feedback information (for example, specifically, when only 1 bit is reported through PUCCH), one sidelink HARQ process or sidelink HARQ process ID per CG may be operated or used. For example, when mode 1 CG operation is performed, when the UE is not configured to report PUCCH-based sidelink HARQ feedback information (for example, specifically, when only 1 bit is reported through PUCCH), the number of sidelink HARQ processes or the sidelink HARQ process ID per CG operated or used may be determined by the UE implementation. That is, for example, the UE may independently determine whether to operate or use multiple sidelink HARQ processes or sidelink HARQ process IDs for a specific CG. Alternatively, for example, the maximum number of sidelink HARQ processes allowed per CG or the maximum number of sidelink HARQ process IDs allowed to be operated or used may be preconfigured.

[0223] Meanwhile, according to an embodiment of the present disclosure, when the UE performs CR evaluation, the base station or the network may signal the UE to what extent future time intervals and / or past time intervals will be included in the preconfigured CR evaluation window. For example, when the UE performs CR evaluation, the base station or the network may signal the UE to what extent future time intervals related to resources reserved by the UE and / or past time intervals related to resources reserved by the UE will be included in the preconfigured CR evaluation window. Or, for example, when the UE performs CR evaluation, the base station or the network may signal the UE to how much future time intervals and / or past time intervals are included as much as possible in the preconfigured CR evaluation window. For example, when the UE performs CR evaluation, the base station or the network may signal the UE to how much future time intervals and / or past time intervals related to resources reserved by the UE and / or past time intervals related to resources reserved by the UE are included as much as possible in the preconfigured CR evaluation window. Here, for example, the length of the time interval can be specifically or independently configured for at least one of the service type, service priority, broadcast type (e.g., unicast, multicast, broadcast), message generation type (e.g., periodic, aperiodic), and QoS requirements (e.g., latency, reliability).

[0224] For example, the base station or the network may signal to the UE information about the minimum future time interval and / or the minimum past time interval within the preconfigured CR evaluation window. Alternatively, for example, the base station or the network may signal to the UE information about the maximum future time interval and / or the maximum past time interval within the preconfigured CR evaluation window.

[0225] Meanwhile, according to an embodiment of the present disclosure, when the UE reserves additional transmission resources or retransmission resources, based on the last transmission resource signaled by the previous SCI or the preconfigured Xth resource, the UE may form a selection window for selecting the additional transmission resource or retransmission resource. Here, for example, the selection window may have a preconfigured size (e.g., a range within 31 time slots or 32 time slots). Here, for example, the UE may select the additional transmission resource or retransmission resource from the resources within the selection window after the time of the last transmission resource signaled by the previous SCI or the preconfigured Xth resource. In addition, for example, in addition to the time slot associated with the transmission resource previously signaled by the SCI, the UE may select the additional transmission resource or the additional retransmission resource within the selection window.

[0226] Meanwhile, according to an embodiment of the present disclosure, when the UE selects three transmission resources, the UE may preferentially randomly select the first transmission resource from the optional candidate resources based on sensing within the selection window. Thereafter, the UE may select two additional transmission resources within a preconfigured time window (e.g., 32 time slots) based on the selected first transmission resource. Here, for example, when the UE selects two additional transmission resources from the optional candidate resources on the remaining time slots within the selection window, the UE may repeatedly randomly select two transmission resources, except for the time slot associated with the selected first transmission resource, until the selected first transmission resource and the remaining two transmission resources can be included in the preconfigured time window. In addition, for example, based on the above rules, after the UE completes the selection of three transmission resources, the UE may select an additional transmission resource based on the second transmission resource or the last resource or the preconfigured Xth transmission resource signaled by the SCI. In this case, the additionally selected transmission resource may be located before the third transmission resource signaled by the SCI. For example, in the case of a service requiring low latency, based on the above rules, after the UE completes the selection of three transmission resources, the UE may select additional transmission resources based on the second transmission resource or the last resource signaled by the SCI or the preconfigured Xth transmission resource. In this case, some additionally selected transmission resources may be located before the third transmission resource signaled by the SCI.

[0227] Here, for example, in order to include a PSFCH resource or a PSFCH time slot between transmission resources (e.g., transmission resource A and transmission resource B) to be selected by the UE, after the UE randomly selects transmission resource A, the UE may select transmission resource B from among the resources after the preconfigured N time slots or the preconfigured N symbols from among the nearest PSFCH resource or PSFCH time slot that appears after the preconfigured M time slots based on the time of transmission resource A. For example, the preconfigured M time slots may include processing time for PSSCH / PSCCH reception and preparation time for PSFCH transmission. For example, the preconfigured N time slots or the preconfigured N symbols may include processing time for PSFCH reception and preparation time for PSSCH / PSCCH retransmission. Or, for example, the UE may select transmission resource A from among resources before the PSFCH resource or PSFCH time slot by M time slots within a preconfigured time window (e.g., 32) based on the PSFCH resource or PSFCH time slot. Thereafter, the UE may select transmission resource B from among the resources after N time slots or N symbols of the PSFCH resource or PSFCH time slot. Here, for example, the selected transmission resource A or transmission resource B and the PSFCH resource or PSFCH time slot may be included in a preconfigured time window (e.g., 32). For example, the selected transmission resource A and transmission resource B and the PSFCH resource or PSFCH time slot may all be included in a preconfigured time window (e.g., 32).

[0228] At the same time, according to an embodiment of the present disclosure, when a mode 1 transmitting UE performs a specific TB transmission on a sidelink transmission resource scheduled from a base station, according to a predefined rule, operations related to TB transmission can be omitted. In this case, for example, the mode 1 transmitting UE can report NACK information to the base station through the PUCCH resource, and additional retransmission resources can be allocated from the base station. Here, for example, according to the above rules, when uplink transmission and / or downlink reception overlaps with sidelink transmission #X in the time domain, operations related to sidelink transmission #X can be omitted based on the priority of the associated logical channel. And / or, for example, when uplink transmission and / or sidelink transmission #X and sidelink transmission #Y on different carriers overlap in the time domain, and when the transmit power is first allocated to the uplink transmission and / or sidelink transmission #X based on the priority of the associated logical channel, because there is no remaining transmit power that can be allocated for sidelink transmission #Y, operations related to sidelink transmission #Y can be omitted. Here, for example, the rule can be applied when the UE normally performs TB-related initial transmission on the mode 1 SL transmission resource and omits the retransmission operation. For example, it may be considered to additionally perform omitted retransmissions by reporting resources allocated to the UE based on PUCCH NACK information. For example, the rule may be applied to packet transmission or service transmission with a priority higher than a preconfigured threshold and / or a QoS requirement (e.g., latency, reliability) that is stricter than the preconfigured threshold, and / or mode 1 CG / DG-based packet transmission or service transmission. For example, the rule may be applied when the congestion level (e.g., CBR measurement value) of the resource pool is lower than a preconfigured threshold. For example, the rule may be applied when the congestion level (e.g., CBR measurement value) of the resource pool is higher than a preconfigured threshold.

[0229] At the same time, according to an embodiment of the present disclosure, in order to effectively support services with minimum communication range requirements, a TX-RX distance-based feedback operation for sending only NACK may be performed or configured. For example, in order to effectively support services with minimum communication range requirements, the UE may perform multicast option 1 based on the distance between the sending UE and the receiving UE (for example, NACK (no acknowledgement) information is sent to the sending UE only when the receiving UE fails to decode / receive the PSSCH received from the sending UE). In this case, for example, when the receiving UE cannot know its location information and / or when the accuracy of its location information is lower than a preconfigured threshold, the receiving UE may not perform PSFCH transmission (i.e., sidelink HARQ feedback information transmission) to the sending UE. Here, for example, when the operation of multicast option 1 is applied, according to the above rules, when PSFCH transmission is not performed, it can be considered that the receiving UE sends ACK information to the sending UE.

[0230] At the same time, according to an embodiment of the present disclosure, when the base station sends a mode 1 permission to the sending UE with a signal, the associated PUCCH resources may be allocated or scheduled for the sending UE. Thereafter, when the sending UE performs transmission through the mode 1 transmission resources without requesting or receiving sidelink HARQ feedback from the receiving UE, if additional retransmission resources are required to meet service-related requirements (e.g., latency, reliability), the sending UE may report NACK information to the base station through the PUCCH. On the other hand, for example, when no additional retransmission resources are required, the sending UE may report ACK information to the base station through the PUCCH. Or, for example, the sending UE may not perform PUCCH transmission. For example, when the sending UE performs blind retransmission through the mode 1 transmission resources, the sending UE may report NACK information to the base station through the PUCCH based on the required additional retransmission resources. Or, for example, when the sending UE performs blind retransmission through the mode 1 transmission resources, the sending UE may report ACK information to the base station through the PUCCH based on the unnecessary additional retransmission resources.

[0231] At the same time, according to an embodiment of the present disclosure, when resource reselection is triggered at time slot #N, based on the sensing results obtained in the interval from time slot # (N-offset1) to time slot # (N-SEN_WIN), the transmitting UE can select the transmission resource within the selection window period from slot # (N+offset2) to slot # (N+offset3). For example, SEN_WIN can be a value greater than offset1. For example, offset3 can be a value greater than offset2. Here, for example, SEN_WIN can be the length of the sensing window. In addition, the length of the sensing window can be preconfigured from the base station / network. In addition, for example, offset3 can be selected to be less than or equal to the packet delay budget (PDB) of the transmission packet. That is, for example, offset3 can be less than or equal to the packet delay budget (PDB) of the transmission packet. For example, according to the above process, after the transmitting UE selects a transmission resource (e.g., time slot # (N + offset2 + K)) within the selection window, when the transmission resource of another UE overlaps with the transmission resource before the signaling for SCI related to the transmission resource is performed, the transmitting UE can reselect the previously selected transmission resource. Such an operation can be called a re-evaluation process. Here, for example, the sensing operation related to the re-evaluation process can be configured to be performed or triggered only from the above-mentioned time slot #N to time slot # (N + offset2 + K-T1). Or, for example, the sensing operation related to the re-evaluation process can be configured to be performed or triggered only from the above-mentioned time slot # (N-offset1) to time slot # (N + offset2 + K-T1). Or, for example, the sensing operation related to the re-evaluation process can be configured to be performed or triggered only from the above-mentioned time slot # (N-SEN_WIN) to time slot # (N + offset2 + K-T1). Alternatively, for example, the sensing operation related to the re-evaluation process may be configured to be performed or triggered only from the above slot # (N+offset2) to slot # (N+offset2+K-T1). Here, for example, T1 may be the processing time required for resource reselection based on re-evaluation sensing.

[0232] Meanwhile, according to an embodiment of the present disclosure, the resource reservation period on the SCI signaled by a transmitting UE belonging to different base stations or networks may be interpreted ambiguously. Therefore, for example, the size of a field related to the resource reservation period on the SCI may be defined based on the maximum number of configurable periods (e.g., N) (e.g., CEILING (log2N)). In addition, for example, the ascending values ​​of the N periods may be mapped to the ascending states of the bit values ​​associated with each field. For example, the transmitting UE may determine the size of a field related to the resource reservation period on the SCI based on the maximum number of configurable periods (e.g., N) (e.g., CEILING (log2N)). Here, for example, when the above-mentioned embodiment is applied, even if different base stations or networks configure the reservation period value or the number of reservation periods for the resources allowed for each resource pool differently, the transmitting UE belonging to different base stations or networks may determine the resource reservation period on the SCI without any ambiguity.

[0233] At the same time, according to an embodiment of the present disclosure, the rules for determining resources associated with PSFCH transmission between unicast and groupcast can be configured differently. Specifically, for example, in the case of multicast, unlike unicast, the number of members in the group (NUM_GP) can be used as a parameter for determining PSFCH transmission resources associated with the received PSSCH / PSCCH. For example, in the case of unicast, NUM_GP can be assumed to be 0. For example, in the case of unicast, NUM_GP can be 0. For the convenience of the following description, for example, the unicast HARQ feedback scheme is referred to as UN_HARQ, and the groupcast HARQ feedback schemes are respectively referred to as GP_HARQ. When the above embodiments are applied, for example, if there is no indication / distinction on the SCI associated with the PSSCH which feedback scheme is requested between UN_HARQ and GP_HARQ, ambiguity may arise on the receiving UE side. For example, if unicast / multicast and / or UN_HARQ / GP_HARQ use the same SCI format or the second SCI format, if there is no indication / distinction on the SCI associated with the PSSCH as to which feedback scheme among UN_HARQ and GP_HARQ is requested, ambiguity may occur on the receiving UE side. For example, if the L1 destination ID and / or L1 source ID on the SCI associated with unicast / multicast and / or UN_HARQ / GP_HARQ are the same, if there is no indication / distinction on the SCI associated with the PSSCH as to which feedback scheme among UN_HARQ and GP_HARQ is requested, ambiguity may occur on the receiving UE side. For example, in order to solve such a problem, the receiving UE may determine the applied sidelink HARQ feedback scheme according to the various embodiments below.

[0234] According to an embodiment, when a receiving UE receives an SCI indicated by an L1 destination ID (e.g., LSB 16 bits of an L2 destination ID) determined in a PC5 RRC connection established by the receiving UE, the receiving UE may send sidelink HARQ feedback for a PSSCH associated with the SCI in a UN_HARQ or GP_HARQ scheme.

[0235] According to another embodiment, when the receiving UE receives the SCI indicated by the L1 destination ID determined in the PC5 RRC connection established by the receiving UE, the receiving UE may additionally check the L1 source ID on the SCI. At this time, for example, if it matches the L1 source ID (e.g., the LSB 8 bits of the L2 source ID) determined in the PC5 RRC connection established by the receiving UE, the receiving UE may send sidelink HARQ feedback for the PSSCH associated with the SCI using the UN_HARQ or GP_HARQ scheme. For example, in addition to the above case, the receiving UE may send sidelink HARQ feedback for the PSSCH associated with the SCI using the GP_HARQ or UN_HARQ scheme. That is, for example, when the L1 ID determined in the PC5 RRC connection does not match the L1 ID on the SCI, the receiving UE may send sidelink HARQ feedback for the PSSCH associated with the SCI using the GP_HARQ or UN_HARQ scheme. For example, if it matches the L1 source ID (e.g., the LSB 8 bits of the L2 source ID) determined in the PC5 RRC connection established by the receiving UE, the receiving UE may use the UN_HARQ scheme to send sidelink HARQ feedback for the PSSCH associated with the SCI. For example, if it does not match the L1 source ID (e.g., the LSB 8 bits of the L2 source ID) determined in the PC5 RRC connection established by the receiving UE, the receiving UE may use the GP_HARQ scheme to send sidelink HARQ feedback for the PSSCH associated with the PSSCH. For example, in the above rule, one of the UN_HARQ scheme or the GP_HARQ scheme may be selected depending on whether the L1 ID determined or used in the PC5 RRC connection is the same as the L1 ID on the SCI.

[0236] According to another embodiment, when the receiving UE does not establish a PC5 RRC connection, the receiving UE may send sidelink HARQ feedback for the PSSCH associated with the SCI using a UN_HARQ or GP_HARQ scheme.

[0237] Meanwhile, according to an embodiment, in the case of a sidelink HARQ feedback operation based on TX-RX distance (e.g., multicast option 1), according to the following embodiments, the sidelink HARQ feedback operation without considering the TX-RX distance may be indicated for the UE. For example, in the case of a sidelink HARQ feedback operation based on TX-RX distance (e.g., multicast option 1), according to the following embodiments, it may be indicated to disable the sidelink HARQ feedback operation based on TX-RX distance.

[0238] According to an embodiment, when the minimum communication range field and / or the area ID field associated with the transmitting UE defined on the SCI indicates a preconfigured specific state or value, a side link HARQ feedback operation can be triggered for the UE without considering the TX-RX distance. For example, when the minimum communication range field and / or the area ID field associated with the transmitting UE defined on the SCI indicates a preconfigured specific state or value, the side link HARQ feedback operation based on the TX-RX distance can be disabled for the UE. For example, the SCI can be the second SCI. Specifically, for example, when the minimum communication range field indicates a preconfigured infinity value, if the PSSCH decoding fails, the receiving UE receiving the SCI can send NACK information to the transmitting UE without considering the TX-RX distance. Or, for example, even if the receiving UE fails to decode the PSSCH, the side link HARQ feedback (e.g., NACK) may not be sent to the transmitting UE. Or, for example, when the minimum communication range field indicates a preconfigured value of 0, if the PSSCH decoding fails, the receiving UE receiving the SCI can send NACK information to the transmitting UE without considering the TX-RX distance. Alternatively, for example, even if the receiving UE fails to decode the PSSCH, the sidelink HARQ feedback (eg, NACK) may not be sent to the transmitting UE.

[0239] At the same time, according to an embodiment of the present disclosure, when scheduling sidelink transmission between different RATs, the following various embodiments may be applied. Here, the different RATs may be LTE and NR.

[0240] According to an embodiment, when an LTE base station (e.g., an eNB) schedules an NR side link (e.g., scheduling a side link transmission resource based on CG type 1), if the NR side link is performed on an NR granted carrier, a first transmission timing of the NR side link may be determined based on a TA / 2 (e.g., TA refers to a timing advance) value between the NR base station (e.g., gNB) and the UE. For example, the first transmission timing of the NR side link may be based on or In addition, for example, if the NR side link is performed on an ITS dedicated carrier, the first transmission timing of the NR side link may be determined based on the TA / 2 value between the LTE base station and the UE. Here, for example, the TA value may be 0 or a preconfigured value. Here, for example, T DCI The X value may be the start time of the time slot for receiving the cross-RAT scheduling DCI. For example, the X value may be the timing offset value indicated on the cross-RAT scheduling DCI. For example, the M value may be the timing offset value on the DCI used when the LTE base station schedules a mode 3 sidelink transmission to the UE.

[0241] According to an embodiment, when the NR base station (e.g., gNB) schedules the LTE side link (e.g., scheduling transmission resources based on mode 3 SL SPS), if the LTE side link is performed on the LTE authorized carrier, the first transmission timing of the LTE side link may be determined based on the TA / 2 value between the LTE base station (e.g., eNB) and the UE. For example, it may be based on To determine the first transmission timing. In addition, for example, if the LTE side link is performed on the ITS dedicated carrier, the first transmission timing of the NR side link can be determined based on the TA / 2 value between the NR base station (e.g., gNB) and the UE. Here, for example, the TA value can be 0 or a preconfigured value. Here, for example, T S The value can be 1 / 30720. For example, N TA The value may be the timing offset between uplink and / or downlink radio frames.

[0242] Fig.13 The process of a sending UE sending sidelink HARQ feedback to a base station through a PUCCH according to an embodiment of the present disclosure is shown. Fig.13 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0243] refer to Fig.13, in step S1310, the transmitting UE may receive a CG from the base station. For example, the CG may include information about PUCCH resources related to the side link. In step S1320, the transmitting UE may send a PSCCH to the receiving UE based on the CG. In step S1330, the transmitting UE may send a PSSCH related to the PSCCH to the receiving UE based on the CG. For example, the SCI may be sent via the PSCCH or a PSSCH related to the PSSCH. For example, the transmitting UE may send the SCI to the receiving UE via the PSCCH or a PSSCH related to the PSCCH. For example, the SCI may include period information of reserved resources related to the side link. For example, the period information of reserved resources related to the side link may be configured by a preconfigured bit value. For example, a candidate period value available in a resource pool among multiple candidate period values ​​may be configured for the transmitting UE. For example, a mapping relationship between a candidate period value configured for the transmitting UE and a preconfigured bit value may be determined. For example, a candidate period value configured for the transmitting UE may be determined to be less than or equal to the maximum number of candidate periods based on a preconfigured bit value. For example, the candidate period values ​​configured for the transmitting UE can be mapped to the preconfigured bits in ascending order of the decimal values ​​of the preconfigured bits starting with the first candidate period value.

[0244] In step S1340, the transmitting UE may transmit the sidelink HARQ feedback information to the base station via the PUCCH. For example, based on disabling HARQ feedback and not requiring retransmission associated with the PSSCH, the transmitting UE may transmit the sidelink HARQ feedback information to the base station via the PUCCH resources. For example, the sidelink HARQ feedback information may include ACK information or NACK information. For example, based on disabling HARQ feedback and not requiring retransmission associated with the PSSCH, the transmitting UE may transmit ACK to the base station via the PUCCH resources.

[0245] Fig.14 A method for a sending UE to reselect a first transmission resource based on an embodiment of the present disclosure is shown. Fig.15 An example is shown in which a transmitting UE according to an embodiment of the present disclosure reselects a first transmission resource based on an overlap of the first transmission resource with a second transmission resource to be used by other UEs. Fig.14 and Fig.15 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0246] refer to Fig.14In step S1410, the transmitting UE may perform sensing of the transmission resource based on the first priority. In step S1420, the transmitting UE may select the first transmission resource based on the sensing. For example, the SCI may include information for sharing the first transmission resource with other UEs. For example, the transmitting UE may send the SCI to other UEs via the PSCCH or the PSSCH related to the PSCCH.

[0247] In step S1430, the transmitting UE may reselect the first transmission resource based on the overlap of the first transmission resource with the second transmission resource to be used by other UEs. For example, the priority of the packet associated with the second transmission resource may be higher than the preconfigured priority. For example, based on the fact that the packet associated with the first transmission resource is not transmitted, the transmitting UE may compare the priority of the packet associated with the second transmission resource with the first priority. Here, for example, based on the fact that the priority of the packet associated with the second transmission resource is higher than the first priority, the transmitting UE may reselect the first transmission resource.

[0248] Specifically, refer to Fig.15 , the sending UE may perform sensing on the transmission resource based on the first priority within a sensing window associated with the transmission resource, and may select the first transmission resource within the selection window based on the sensing. In this case, for example, based on information related to the transmission resource received from other UEs through the SCI, the sending UE may determine that the first transmission resource and the second transmission resource are overlapped. For example, if the priority of the packet associated with the second transmission resource overlapping the first transmission resource is higher than the preconfigured priority, the sending UE may reselect the first transmission resource.

[0249] Fig.16 The process of a sending UE sending sidelink HARQ feedback to a base station through a PUCCH and receiving a DG from the base station based on an embodiment of the present disclosure is shown. Fig.17 An example is shown in which a sending UE performs retransmission using resources allocated via a CG within a preconfigured time window based on an embodiment of the present disclosure. Fig.16 and Fig.17 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0250] refer to Fig.16 , in step S1610, the transmitting UE may receive a CG from the base station. For example, the CG may include at least one of information about PUCCH resources related to the side link or periodic information of resources related to the CG. In step S1620, the transmitting UE may send a PSCCH to the receiving UE within a first period based on the CG. For example, the first period may be determined based on the periodic information of resources related to the CG. In step S1630, the transmitting UE may send a PSSCH related to the PSCCH to the receiving UE within the first period based on the CG.

[0251] In step S1640, the transmitting UE may receive sidelink HARQ feedback information from the receiving UE. For example, the transmitting UE may receive sidelink HARQ feedback for PSSCH from the receiving UE based on the sidelink HARQ feedback being enabled. For example, the sidelink HARQ feedback information may include ACK information or NACK information. For example, the transmitting UE may receive NACK for PSSCH from the receiving UE based on the sidelink HARQ feedback being enabled.

[0252] In step S1650, the transmitting UE may send sidelink HARQ feedback information to the base station via PUCCH. For example, the transmitting UE may send NACK information for PSSCH to the base station via PUCCH. In step S1660, the transmitting UE may receive DG from the base station. For example, the base station may send DG to the UE based on the NACK information.

[0253] In step S1670, the transmitting UE may retransmit the PSSCH to the receiving UE based on the DG. For example, the transmitting UE may retransmit the PSCCH or the PSSCH related to the PSCCH to the receiving UE within a preconfigured time window through the resources allocated by the DG. For example, the transmitting UE may retransmit the PSCCH or the PSSCH related to the PSCCH to the receiving UE based on the resources allocated by the DG within a preconfigured time window associated with the CG. For example, the preconfigured time window may include a period that is located after the first period and before a period that includes transmission resources having the same HARQ process ID as the HARQ process ID associated with the resources of the first period in which the initial transmission is performed.

[0254] For example, the transmitting UE may receive sidelink HARQ feedback for a PSCCH retransmitted based on a DG (hereinafter referred to as the first DG) or a PSSCH related to the PSCCH from a receiving UE. For example, based on the sidelink HARQ feedback for the retransmitted PSCCH or the retransmitted PSSCH related to the PSCCH being NACK, the transmitting UE may send NACK to the base station via the PUCCH related to the first DG. For example, the transmitting UE may receive a second DG from the base station, and the transmitting UE may retransmit the PSCCH or the PSSCH related to the PSCCH to the receiving UE within a preconfigured window related to the CG based on the resources allocated through the second DG.

[0255] Specifically, refer to Fig.17, for example, the sending UE may perform an initial transmission through a first CG resource within a first period. Then, for example, the sending UE may receive a NACK for the initial transmission from the receiving UE. For example, the sending UE may perform a retransmission within a preconfigured time window based on the reception of the NACK. For example, the preconfigured window may be a preconfigured window related to the CG. For example, the sending UE may perform a retransmission before a period in which a second CG resource having the same HARQ process ID as the first CG resource appears. That is, for example, the preconfigured time window may include a period before a period in which a second CG resource having the same HARQ process ID as the first CG resource appears.

[0256] For example, a buffer associated with a sidelink HARQ process may be refreshed by the transmitting UE after a preconfigured time window. For example, the transmitting UE may refresh a buffer of a sidelink HARQ process associated with a PSSCH after a preconfigured time window. For example, the sidelink HARQ process may be a HARQ process based on a PSCCH or a PSSCH associated with a PSCCH.

[0257] Fig.18 A process of sending ACK to a base station based on a DG received by a sending UE according to an embodiment of the present disclosure is shown. Fig.18 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0258] refer to Fig.18 , in step S1810, the transmitting UE may receive a CG from the base station. For example, the CG may include at least one of information about PUCCH resources related to the side link or periodic information of resources related to the CG. In step S1820, the transmitting UE may send a PSCCH to the receiving UE based on the CG. In step S1830, the transmitting UE may send a PSSCH related to the PSCCH to the receiving UE based on the CG. In step S1840, the transmitting UE may receive sidelink HARQ feedback information from the receiving UE. For example, the transmitting UE may receive sidelink HARQ feedback for the PSSCH from the receiving UE based on the sidelink HARQ feedback being enabled. For example, the sidelink HARQ feedback information may include ACK information or NACK information. For example, the transmitting UE may receive ACK for the PSSCH from the receiving UE based on the sidelink HARQ feedback being enabled.

[0259] In step S1850, the transmitting UE may send sidelink HARQ feedback information to the base station via the PUCCH. For example, the transmitting UE may send ACK information for the PSSCH to the base station via the PUCCH. In step S1860, the transmitting UE may receive a DG from the base station. For example, the base station may send the DG to the transmitting UE based on misidentifying the ACK information as NACK information. For example, the transmitting UE may not send the PSCCH or the PSSCH related to the PSCCH to the receiving UE based on the resources allocated via the DG. In step S1870, the transmitting UE may send ACK information to the base station via the PUCCH based on the reception of the DG.

[0260] For example, based on the sidelink HARQ feedback being enabled, and based on the transmitting UE receiving an ACK from the receiving UE, and based on the transmitting UE sending an ACK to the base station through the PUCCH, the transmitting UE may receive the DG and PUCCH information related to the DG from the base station. Thereafter, for example, the transmitting UE may not retransmit the PSCCH or the PSSCH related to the PSCCH to the receiving UE based on the resources allocated through the DG. In addition, for example, the transmitting UE may send an ACK to the base station based on the PUCCH resources allocated through the DG.

[0261] Based on an embodiment of the present disclosure, resources related to the initial transmission from the base station can be allocated to the transmitting UE through the DG. In this case, for example, the transmitting UE can receive a first DG and PUCCH information related to the first DG from the base station. Here, for example, the first DG can be a DG for allocating resources related to the initial transmission to the transmitting UE. For example, the transmitting UE can send a PSCCH to the receiving UE based on the first DG. For example, the transmitting UE can send a PSSCH related to the PSCCH to the receiving UE based on the first DG. For example, the transmitting UE can receive sidelink HARQ feedback information from the receiving UE. For example, the transmitting UE can receive sidelink HARQ feedback for PSSCH from the receiving UE based on the sidelink HARQ feedback being enabled. For example, the sidelink HARQ feedback information may include ACK information or NACK information. For example, the transmitting UE can receive ACK for PSSCH from the receiving UE based on the sidelink HARQ feedback being enabled. For example, the transmitting UE can send ACK information for PSSCH to the base station through the PUCCH. For example, the transmitting UE can receive a second DG from the base station. Here, for example, the second DG may be a DG for allocating resources related to retransmission to the sending UE. For example, the base station may send the second DG to the sending UE based on misidentifying the ACK information as NACK information. For example, the sending UE may not send the PSCCH or the PSSCH related to the PSCCH to the receiving UE based on the resources allocated by the second DG. The sending UE may send ACK information to the base station through the PUCCH based on the reception of the second DG.

[0262] Fig.19 A method for a first device to send side link HARQ feedback to a base station through a PUCCH based on an embodiment of the present disclosure is shown. Fig.19 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0263] refer to Fig.19 In step S1910, the first device 100 may receive a configured grant (CG) from a base station. For example, the CG may include information about a physical uplink control channel (PUCCH) resource associated with a side link (SL). For example, the CG may include periodic information of resources associated with the CG.

[0264] In step S1920, the first device 100 may send a physical sidelink control channel (PSCCH) to the second device 200 based on the CG. In step S1930, the first device 100 may send a physical sidelink shared channel (PSSCH) related to the PSCCH to the second device 200 based on the CG. For example, the first device 100 may send the PSCCH or the PSSCH related to the PSCCH through the CG resources in the first period. For example, the first period may be determined based on period information of resources related to the CG.

[0265] In step S1940 , the first device 100 may send an acknowledgement (ACK) to the base station through a PUCCH resource based on that SL hybrid automatic repeat request (HARQ) feedback is disabled and retransmission related to the PSSCH is not required.

[0266] For example, the first device 100 may receive first SL HARQ feedback information for PSSCH from the second device based on SL HARQ feedback being enabled. For example, the first device 100 may send the first SL HARQ feedback information to the base station via PUCCH. For example, the first device 100 may receive a first dynamic grant (DG) and PUCCH information related to the first DG from the base station based on the first SL HARQ feedback information as a negative acknowledgement (NACK). For example, the first device 100 may retransmit the PSCCH or the PSSCH related to the PSCCH to the second device 200 based on the resources allocated by the first DG within a preconfigured time window related to the CG.

[0267] For example, the first device 100 may receive second SL HARQ feedback information for a retransmitted PSCCH or a retransmitted PSSCH associated with the retransmitted PSCCH from the second device 200. For example, the first device 100 may send a NACK to the base station through a PUCCH associated with the first DG based on the second SL HARQ feedback information as NACK. For example, the first device 100 may receive a second DG and PUCCH information associated with the second DG from the base station. For example, the first device 100 may retransmit a PSCCH or a PSSCH associated with the PSCCH to the second device 200 based on resources allocated through the second DG within a preconfigured time window associated with the CG.

[0268] For example, the buffer associated with the SL HARQ process may be refreshed by the first device 100 after a preconfigured time window associated with the CG. For example, the SL HARQ process is a HARQ process based on a retransmitted PSCCH or a retransmitted PSSCH associated with the retransmitted PSCCH.

[0269] For example, the first device 100 may be enabled based on SL HARQ feedback, the first device 100 receives ACK from the second device 200, and the first device 100 sends ACK to the base station through PUCCH, and receives DG and PUCCH information related to DG from the base station. For example, the base station may misidentify ACK information sent by the first device 100 through PUCCH as NACK information. For example, the base station may send DG to the first device 100 based on misidentifying ACK information as NACK information. For example, the first device 100 may not retransmit PSCCH or PSSCH related to PSCCH to the second device 200 based on resources allocated through DG. For example, the first device 100 may send ACK to the base station based on PUCCH resources allocated through DG.

[0270] The proposed method can be applied to devices based on various embodiments of the present disclosure. First, the processor 102 of the first device 100 can control the transceiver 106 to receive a configured grant (CG) from the base station. In addition, the processor 102 of the first device 100 can control the transceiver 106 to send a physical sidelink control channel (PSCCH) to the second device 200 based on the CG. In addition, the processor 102 of the first device 100 can control the transceiver 106 to send a physical sidelink shared channel (PSSCH) related to the PSCCH to the second device 200 based on the CG. In addition, the processor 102 of the first device 100 can control the transceiver 106 to send an acknowledgment (ACK) to the base station through a PUCCH resource based on the fact that SL hybrid automatic repeat request (HARQ) feedback is disabled and retransmission related to the PSSCH is not required.

[0271] Based on an embodiment of the present disclosure, a first device configured to perform wireless communication may be provided. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: receive a configured grant (CG) from a base station, including information about a physical uplink control channel (PUCCH) resource associated with a side link (SL); send a physical sidelink control channel (PSCCH) to a second device based on the CG; send a physical sidelink shared channel (PSSCH) associated with the PSCCH to the second device based on the CG; and send an acknowledgment (ACK) to the base station via PUCCH resources based on SL hybrid automatic repeat request (HARQ) feedback being disabled and no retransmission associated with the PSSCH is required.

[0272] Based on an embodiment of the present disclosure, a device configured to control a first user equipment (UE) may be provided. For example, the device may include: one or more processors; and one or more memories, which are operably connected to the one or more processors and store instructions. For example, one or more processors may execute instructions to: receive a configured grant (CG) from a base station, including information about a physical uplink control channel (PUCCH) resource associated with a side link (SL); send a physical sidelink control channel (PSCCH) to a second UE based on the CG; send a physical sidelink shared channel (PSSCH) associated with the PSCCH to the second UE based on the CG; and send an acknowledgment (ACK) to the base station via PUCCH resources based on SL hybrid automatic repeat request (HARQ) feedback being disabled and no retransmission associated with the PSSCH is required.

[0273] Based on an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, when these instructions are executed, a first device may: receive a configured grant (CG) from a base station, the configured grant (CG) including information about a physical uplink control channel (PUCCH) resource associated with a side link (SL); send a physical side link control channel (PSCCH) to a second device based on the CG; send a physical side link shared channel (PSSCH) associated with the PSCCH to the second device based on the CG; and send an acknowledgment (ACK) to the base station via PUCCH resources based on SL hybrid automatic repeat request (HARQ) feedback being disabled and no retransmission associated with the PSSCH is required.

[0274] Fig. 20 A method in which a first device sends SCI to a second device through a PSCCH or a PSSCH related to the PSCCH according to an embodiment of the present disclosure is shown. Fig. 20 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0275] refer to Fig. 20 , in step S2010, the first device 100 may send a physical sidelink control channel (PSCCH) to the second device 200. In step S2020, the first device 100 may send a physical sidelink shared channel (PSSCH) related to the PSCCH to the second device 200. For example, the first device 100 may send the SCI through the PSCCH or the PSSCH related to the PSCCH. For example, the SCI may include period information of reserved resources related to the sidelink (SL). For example, the period information of reserved resources related to the SL may be configured by a preconfigured bit value. For example, at least one candidate period value available in a resource pool among a plurality of candidate period values ​​is configured for the first device. For example, a mapping relationship between at least one candidate period value configured for the first device and a preconfigured bit value may be determined. For example, the number of at least one candidate period value configured for the first device may be determined to be less than or equal to the maximum number of candidate periods based on the preconfigured bit value. For example, at least one candidate period value configured for the first device may be mapped to the preconfigured bit value in ascending order of the decimal value of the preconfigured bit value from the first candidate period value.

[0276] For example, the first device 100 may sense the transmission resource based on the first priority. For example, the first device 100 may select the first transmission resource based on sensing. For example, the first device 100 may reselect the first transmission resource based on the overlap of the first transmission resource with the second transmission resource to be used by the second device 200. For example, the SCI may include information for sharing the first transmission resource with other devices. For example, the second transmission resource may be a resource to be used by the second device 200 and may be a resource overlapping with the first transmission resource. For example, the priority of the packet associated with the second transmission resource may be higher than the preconfigured priority. For example, the first device 100 may compare the priority of the packet associated with the second transmission resource with the first priority based on the fact that the packet associated with the first transmission resource is not sent. For example, based on the fact that the priority of the packet associated with the second transmission resource is higher than the first priority, the first device 100 may reselect the first transmission resource. For example, if the packet associated with the first transmission resource is not sent, the first device 100 may reselect the first transmission resource based on the fact that the priority of the packet associated with the second transmission resource is higher than the preconfigured priority and the first priority.

[0277] The proposed method can be applied to devices based on various embodiments of the present disclosure. First, the processor 102 of the first device 100 can control the transceiver 106 to send a physical sidelink control channel (PSCCH) to the second device 200. In addition, the processor 102 of the first device 100 can control the transceiver 106 to send a physical sidelink shared channel (PSSCH) related to the PSCCH to the second device 200.

[0278] Based on an embodiment of the present disclosure, a first device configured to perform wireless communication may be provided. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: send a physical sidelink control channel (PSCCH) to a second device; and send a physical sidelink shared channel (PSSCH) related to the PSCCH to the second device. For example, the SCI may be sent via the PSCCH or the PSSCH related to the PSCCH. For example, the SCI may include period information of reserved resources related to a sidelink (SL). For example, the period information of reserved resources related to the SL may be configured by a preconfigured bit value. For example, at least one candidate period value available in a resource pool among a plurality of candidate period values ​​may be configured for the first device. For example, a mapping relationship between at least one candidate period value configured for the first device and a preconfigured bit value may be determined.

[0279] Based on an embodiment of the present disclosure, a first device configured to perform wireless communication may be provided. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: send a physical sidelink control channel (PSCCH) to a second device; and send a physical sidelink shared channel (PSSCH) related to the PSCCH to the second device. For example, the SCI may be sent via the PSCCH or the PSSCH related to the PSCCH. For example, the SCI may include period information of reserved resources related to a sidelink (SL). For example, the period information of reserved resources related to the SL may be configured by a preconfigured bit value. For example, at least one candidate period value available in a resource pool among multiple candidate period values ​​may be configured for the first device. For example, a mapping relationship between at least one candidate period value configured for the first device and a preconfigured bit value may be determined.

[0280] Based on an embodiment of the present disclosure, a base station may send a configured grant (CG) to a first device, the configured grant (CG) including information about a physical uplink control channel (PUCCH) resource associated with a side link (SL). For example, a physical sidelink control channel (PSCCH) may be sent from a first device to a second device based on the CG. For example, a physical sidelink shared channel (PSSCH) associated with the PSCCH may be sent from a first device to a second device based on the CG. For example, based on the SL hybrid automatic repeat request (HARQ) feedback being disabled and no retransmission associated with the PSSCH is required, the base station may receive an acknowledgment (ACK) from the first device via the PUCCH resource.

[0281] Based on an embodiment of the present disclosure, a base station configured to perform wireless communication may be provided. For example, the base station may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: transmit a configuration grant (CG) including information about a physical uplink control channel (PUCCH) resource associated with a side link (SL) to a first device, wherein the physical side link sends a control channel PSCCH from the first device to the second device based on the CG, wherein a physical sidelink shared channel PSSCH associated with the PSCCH is sent from the first device to the second device based on the CG; and receive an acknowledgment (ACK) from the first device via the PUCCH resource based on the SL hybrid automatic repeat request (HARQ) feedback being disabled and no retransmission associated with the PSSCH is required.

[0282] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0283] The various descriptions, functions, processes, proposals, methods and / or operation flows of the present disclosure described in this document may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0284] Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise described, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0285] Fig.21 A communication system ( 1 ) according to an embodiment of the present disclosure is shown.

[0286] Reference Fig.21, a communication system (1) to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot (100a), a vehicle (100b-1, 100b-2), an extended reality (XR) device (100c), a handheld device (100d), a home appliance (100e), an Internet of Things (IoT) device (100f), and an artificial intelligence (AI) device / server (400). For example, a vehicle may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of head mounted devices (HMDs), head up displays (HUDs) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device (200a) may operate as a BS / network node relative to other wireless devices.

[0287] Here, in addition to LTE, NR and 6G, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may also include a narrowband Internet of Things for low-power communication. In this case, for example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology, and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on the LTE-M technology. In this case, as an example, the LTE-M technology may be an example of an LPWAN, and may be referred to as various names including enhanced machine type communication (eMTC), etc. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, a low power wide area network (LPWAN), and ZigBee considering low power communication, and is not limited to the above names. As an example, the ZigBee technology may generate a personal area network (PAN) related to small / low power digital communication based on various standards including IEEE 802.15.4, etc., and may be referred to by various names.

[0288] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without going through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0289] Wireless communication / connection 150a, 150b or 150c may be established between wireless devices 100a to 100f / BS 200 or BS200 / BS 200. Here, the wireless communication / connection may be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device may send / receive radio signals to / from each other through wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b may send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of a resource allocation process may be performed based on various proposals of the present disclosure.

[0290] Fig. 22 A wireless device according to an embodiment of the present disclosure is shown.

[0291] Reference Fig. 22 , the first wireless device (100) and the second wireless device (200) may transmit radio signals via various RATs (e.g., LTE and NR). Herein, {the first wireless device (100) and the second wireless device (200)} may correspond to Fig.21 {wireless device (100x) and BS (200)} and / or {wireless device (100x) and wireless device (100x)}.

[0292] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may also additionally include one or more transceivers 106 and / or one or more antennas 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then send a radio signal including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive a radio signal including second information / signals through the transceiver 106, and then store the information obtained by processing the second information / signals in the (one or more) memories 104. The (one or more) memories 104 may be connected to the (one or more) processors 102, and may store various information related to the operation of the (one or more) processors 102. For example, the memory (s) 104 may store software code including commands for executing part or all of the processing controlled by the processor (s) 102 or for executing the description, function, process, proposal, method and / or operation flow disclosed in this document. Here, the processor (s) 102 and the memory (s) 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver (s) 106 may be connected to the processor (s) 102 and transmit and / or receive radio signals through the antenna (s) 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver (s) 106 may be used interchangeably with the radio frequency (RF) unit (s). In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0293] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may also additionally include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then send a radio signal including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive a radio signal including fourth information / signals through the (one or more) transceivers 106, and then store the information obtained by processing the fourth information / signals in the (one or more) memories 204. The (one or more) memories 204 may be connected to the (one or more) processors 202, and may store various information related to the operation of the (one or more) processors 202. For example, the memory (s) 204 may store software code including commands for executing part or all of the processing controlled by the processor (s) 202 or for executing the description, function, process, proposal, method and / or operation flow disclosed in this document. Here, the processor (s) 202 and the memory (s) 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver (s) 206 may be connected to the processor (s) 202 and transmit and / or receive radio signals through the antenna (s) 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver (s) 206 may be used interchangeably with the RF unit (s). In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0294] Below, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document.

[0295] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, thereby being driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0296] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cash memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located inside and / or outside one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0297] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the method and / or operation flow of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the description, function, process, proposal, method, and / or operation flow disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202, and may send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation flows disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0298] Fig.23 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0299] Reference Fig.23 The signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a precoder (1040), a resource mapper (1050), and a signal generator (1060). Fig.23 Operation / function, not limited to Fig. 22 The processor (102, 202) and / or transceiver (106, 206) of Fig. 22The processor (102, 202) and / or the transceiver (106, 206) are implemented Fig.23 For example, you can Fig. 22 The processor (102, 202) implements blocks 1010 to 1060. Alternatively, Fig. 22 The processor (102, 202) implements blocks 1010 to 1050 and can be Fig. 22 The transceiver (106, 206) is used to implement block 1060.

[0300] Can be through Fig.23 The signal processing circuit (1000) converts the codeword into a radio signal. Herein, the codeword is a coded bit sequence of an information block. The information block may include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0301] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbol of each transmission layer can be mapped (precoded) to (one or more) corresponding antenna ports by the precoder 1040. The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 with the N*M precoding matrix W. Here, N is the number of antenna ports and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) for the complex modulation symbol. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0302] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include multiple symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and multiple subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be sent to other devices through each antenna. To this end, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0303] Can Fig.23 The signal processing process for the signal received in the wireless device is configured in a manner opposite to the signal processing process (1010-1060) of the wireless device. For example, the wireless device (e.g., Fig. 22 100, 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal can be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword can be restored to the original information block by decoding. Therefore, a signal processing circuit (not illustrated) for receiving a signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0304] Fig.24 Another example of a wireless device according to an embodiment of the present disclosure is shown. The wireless device can be implemented in various forms according to the use case / service (refer to Fig.21 ).

[0305] Reference Fig.24 , the wireless device (100, 200) may correspond to Fig. 22 The wireless devices (100, 200) may be configured by various elements, components, units / portions and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130) and additional components (140). The communication unit may include a communication circuit (112) and (one or more) transceivers (114). For example, the communication circuit (112) may include Fig. 22 One or more processors (102, 202) and / or one or more memories (104, 204) of the present invention. For example, the transceiver(s) (114) may include Fig. 22The control unit (120) is electrically connected to the communication unit (110), the memory (130) and the additional components (140), and controls the overall operation of the wireless device. For example, the control unit (120) can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). The control unit (120) can send information stored in the memory unit (130) to the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface in the memory unit (130).

[0306] The additional component (140) may be configured in various ways depending on the type of the wireless device. For example, the additional component (140) may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be implemented in the following forms without limitation: a robot ( Fig.21 100a), vehicles ( Fig.21 100b-1 and 100b-2), XR devices ( Fig.21 100c), handheld devices ( Fig.21 100d), household appliances ( Fig.21 100e), IoT devices ( Fig.21 100f), digital broadcasting terminals, hologram equipment, public safety equipment, MTC equipment, medical equipment, fintech equipment (or financial equipment), security equipment, climate / environmental equipment, AI servers / equipment ( Fig.21 400), BS ( Fig.21 200), network nodes, etc. Depending on the use case / service, wireless devices can be used in mobile or fixed places.

[0307] exist Fig.24In the wireless device (100, 200), all the various elements, components, units / parts and / or modules in the wireless device (100, 200) can be connected to each other through a wired interface, or at least part of them can be connected wirelessly through the communication unit (110). For example, in each of the wireless devices (100, 200), the control unit (120) and the communication unit (110) can be connected by wire, and the control unit (120) and the first unit (e.g., 130, 140) can be connected wirelessly through the communication unit (110). Each element, component, unit / part and / or module within the wireless device (100, 200) can also include one or more elements. For example, the control unit (120) can be constructed by a collection of one or more processors. As an example, the control unit (120) can be constructed by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory ( 130 ) may be constructed by random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, nonvolatile memory, and / or combinations thereof.

[0308] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig.24 .

[0309] Fig.25 A handheld device according to an embodiment of the present disclosure is shown. The handheld device may 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 handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0310] Reference Fig.25 The handheld device (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a memory unit (130), a power supply unit (140a), an interface unit (140b) and an I / O unit (140c). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 to 130 / 140a to 140c correspond to Fig.24 Frame 110 to 130 / 140.

[0311] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the handheld device 100. The control unit 120 may include an application processor (AP). The memory unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. The memory unit 130 may store input / output data / information. The power supply unit 140a may supply power to the handheld device 100 and include a wired / wireless charging circuit, a battery, etc. The interface unit 140b may support the connection of the handheld device 100 to other external devices. The interface unit 140b may include various ports (e.g., audio I / O ports and video I / O ports) for connecting to external devices. The I / O unit 140c may input or output video information / signals, audio information / signals, data and / or information input by a user. The I / O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker and / or a tactile module.

[0312] For example, in the case of data communication, the I / O unit 140c can obtain information / signals (e.g., touch, text, voice, image, or video) input by the user, and the obtained information / signals can be stored in the memory unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals, and directly send the converted radio signals to other wireless devices or to the BS. The communication unit 110 can receive radio signals from other wireless devices or BSs, and then restore the received radio signals to the original information / signals. The restored information / signals can be stored in the memory unit 130, and can be output as various types (e.g., text, voice, image, video, or tactile) through the I / O unit 140.

[0313] Fig.26 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0314] Reference Fig.26 The vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a drive unit (140a), a power supply unit (140b), a sensor unit (140c) and an autonomous driving unit (140d). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to Fig.24 Frame 110 / 130 / 140.

[0315] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may cause the vehicle or autonomous vehicle 100 to travel on the road. The drive unit 140a may include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100, and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire vehicle status, external environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path with a destination set, and the like.

[0316] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically acquire the most recent traffic information data from an external server and acquire surrounding traffic information data from adjacent vehicles. In the middle of autonomous driving, the sensor unit 140c may acquire vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly acquired data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving path, and / or driving plan to an external server. The external server may predict traffic information data using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0317] The claims in this specification can be combined in various ways. For example, the technical features in the method claims of this specification can be combined to be implemented or performed in a device, and the technical features in the device claims can be combined to be implemented or performed in a method. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a device. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a method.

Claims

1. A method for performing wireless communication by a first device, the method comprising: transmitting sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) to the second device through a physical sidelink control channel (PSCCH); and sending data to the second device via the PSSCH, Wherein, the SCI includes fields related to the resource reservation period, wherein, according to a log2 relationship, the bit size of the field corresponds to the number of candidate resource reservation periods associated with the resource pool configured for the first device, and Wherein, the log2 relationship is X=log2N, where X is the bit size of the field and N is the number of the candidate resource reservation periods associated with the resource pool configured for the first device.

2. The method according to claim 1, wherein: The number of candidate resource reservation periods is less than or equal to a maximum number associated with candidate resource reservation periods.

3. The method according to claim 1, further comprising: sensing a transmission resource based on a first priority; selecting a first transmission resource based on the sensing; as well as reselecting the first transmission resource as a second transmission resource based on the first transmission resource overlapping with a third transmission resource to be used by the second device, The SCI includes information for sharing the first transmission resource with other devices.

4. The method according to claim 3, wherein: The second priority of the first packet to be sent in the third transmission resource is higher than the preconfigured priority.

5. The method according to claim 4, further comprising: comparing the second priority of the first packet to be sent in the third transmission resource with the first priority based on that the second packet to be sent in the first transmission resource has not been sent, The second priority of the first packet to be sent in the third transmission resource is higher than the first priority.

6. A first device configured to perform wireless communication, the first device comprising: one or more memories storing instructions; one or more transceivers; as well as one or more processors connected to the one or more memories and the one or more transceivers, The one or more processors execute the instructions to: transmitting sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) to the second device through a physical sidelink control channel (PSCCH); and sending data to the second device via the PSSCH, Wherein, the SCI includes fields related to the resource reservation period, wherein, according to a log2 relationship, the bit size of the field corresponds to the number of candidate resource reservation periods associated with the resource pool configured for the first device, and Wherein, the log2 relationship is X=log2N, where X is the bit size of the field and N is the number of the candidate resource reservation periods associated with the resource pool configured for the first device.

7. The first device according to claim 6, wherein: The number of the candidate resource reservation periods is less than or equal to a maximum number related to the candidate resource reservation periods.

8. The first device according to claim 6, wherein: The one or more processors further execute the instructions to: sensing a transmission resource based on a first priority; selecting a first transmission resource based on the sensing; and reselecting the first transmission resource as a second transmission resource based on the first transmission resource overlapping with a third transmission resource to be used by the second device, The SCI includes information for sharing the first transmission resource with other devices.

9. The first device according to claim 8, wherein: The second priority of the first packet to be sent in the third transmission resource is higher than the preconfigured priority.

10. The first device according to claim 9, wherein: The one or more processors further execute the instructions to: comparing the second priority of the first packet to be sent in the third transmission resource with the first priority based on that the second packet to be sent in the first transmission resource has not been sent, The second priority of the first packet to be sent in the third transmission resource is higher than the first priority.

11. An apparatus configured to control a first user equipment (UE), the apparatus comprising: one or more processors; as well as one or more memories operably connected to the one or more processors and storing instructions, The one or more processors execute the instructions to: transmitting sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) to the second UE through a physical sidelink control channel (PSCCH); and sending data to the second UE via the PSSCH, Wherein, the SCI includes fields related to the resource reservation period, wherein, according to a log2 relationship, the bit size of the field corresponds to the number of candidate resource reservation periods associated with the resource pool configured for the first UE, and Wherein, the log2 relationship is X = log2N, where X is the bit size of the field and N is the number of the candidate resource reservation periods associated with the resource pool configured for the first UE.

12. The device according to claim 11, wherein The number of the candidate resource reservation periods is less than or equal to a maximum number related to the candidate resource reservation periods.

13. The device according to claim 11, wherein: The one or more processors further execute the instructions to: sensing a transmission resource based on a first priority; selecting a first transmission resource based on the sensing; and reselecting the first transmission resource as a second transmission resource based on the first transmission resource overlapping with a third transmission resource to be used by the second UE, The SCI includes information for sharing the first transmission resource with other UEs.

14. The device according to claim 13, wherein: The second priority of the first packet to be sent in the third transmission resource is higher than the preconfigured priority.

15. The device according to claim 14, wherein: The one or more processors further execute the instructions to: comparing the second priority of the first packet to be sent in the third transmission resource with the first priority based on that the second packet to be sent in the first transmission resource has not been sent, The second priority of the first packet to be sent in the third transmission resource is higher than the first priority.

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