METHOD AND APPARATUS FOR PERFORMING SIDELINK RETRANSMISSION IN NR V2X

Abstract

According to an embodiment of the present disclosure, there is provided a method for a first device performing sidelink communication, the method including the steps of receiving, from a base station, a sidelink grant associated with initial transmission resources and first retransmission resources of a transmission block, transmitting a PSCCH and a PSSCH associated with the PSCCH to a second device based on the initial transmission resources, determining a PSFCH resource for receiving a PSFCH from the second device based on a slot index and a subchannel index associated with the PSSCH, receiving the PSFCH associated with the first PSSCH from the second device based on the PSFCH resource, comparing a time interval between the PSFCH resource and the first retransmission resource with a minimum processing time required between reception of the PSFCH and retransmission of the transmission block, and performing sidelink communication with the second device based on the comparison of the time interval and the minimum processing time, wherein the first device drops retransmission of the transmission block on the first retransmission resource when the transmission block is a transmission block for which sidelink HARQ feedback is activated and the time interval is less than the minimum processing time.

Description

[Technical field]

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

[0002] Sidelink (SL) refers to a communication method in which a direct link is established between terminals (User Equipment, UE) and voice or data is directly exchanged between terminals without going through a base station (BS). SL is considered as one solution that can solve the burden on base stations due to the rapidly increasing data traffic. V2X (vehicle-to-everything) refers to a communication technology that exchanges information with other vehicles, pedestrians, infrastructure objects, etc. through wired / wireless communication. V2X can be classified 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 a PC5 interface and / or a Uu interface.

[0003] Meanwhile, as more and more communication devices require larger communication capacity, the need for improved mobile broadband communication compared to existing Radio Access Technology (RAT) is emerging. As a result, communication systems that take into account reliability and latency-sensitive services or terminals are being discussed, and next-generation wireless access technologies that take into account improved mobile broadband communication, massive Machine Type Communication (MTC), Ultra-Reliable and Low Latency Communication (URLLC), etc. can be called new radio access technology (RAT) or new radio (NR). NR can also support vehicle-to-everything (V2X) communication.

[0004] 1 is a diagram for comparing and explaining V2X communication based on a RAT prior to NR and V2X communication based on NR. The embodiment of FIG. 1 may be combined with various embodiments of the present disclosure.

[0005] In relation to V2X communication, in RATs prior to NR, methods of providing safety services based on V2X messages such as Basic Safety Message (BSM), Cooperative Awareness Message (CAM), and Decentralized Environmental Notification Message (DENM) were mainly discussed. V2X messages can include location information, dynamic information, attribute information, etc. For example, a terminal can transmit a periodic message type CAM and / or an event triggered message type DENM to other terminals.

[0006] Since then, various V2X scenarios have been proposed in NR in relation to V2X communication. For example, various V2X scenarios can include vehicle platooning, advanced driving, extended sensors, remote driving, etc. Summary of the Invention [Problem to be solved by the invention]

[0007] A technical problem of the present disclosure is to provide a sidelink (SL) communication method between devices (or terminals) and a device (or terminal) that executes the same.

[0008] Another technical problem of the present disclosure is to provide a method for performing sidelink retransmission in NR V2X and an apparatus (or terminal) for performing the same.

[0009] Another technical object of the present disclosure is to provide a method for performing sidelink communication based on a comparison between a minimum processing time and an actual time interval between a PSFCH resource and a retransmission resource in NR V2X, and an apparatus (or a terminal) for executing the method. [Means for solving the problem]

[0010] According to an embodiment of the present disclosure, a method for a first device performing sidelink communication is provided, the method includes the steps of receiving a sidelink grant related to an initial transmission resource and a first retransmission resource of a transport block from a base station, transmitting a PSCCH (Physical Sidelink Control Channel) and a PSSCH (Physical Sidelink Shared Channel) related to the PSCCH based on the initial transmission resource to a second device, determining a PSFCH resource for receiving a PSFCH (Physical Sidelink Feedback Channel) from the second device based on a slot index and a subchannel index related to the PSSCH, receiving the PSFCH related to the first PSSCH from the second device based on the PSFCH resource, and determining a time interval between the PSFCH resource and the first retransmission resource as a minimum processing time required between receiving the PSFCH and retransmitting the transport block. and performing sidelink communication with the second device based on a comparison of the time interval and the minimum processing time, wherein retransmission for the transmission block is dropped on the first retransmission resource by the first device based on the time interval being less than the minimum processing time, the transmission block being a transmission block for which sidelink Hybrid Automatic Repeat Request (HARQ) feedback is enabled and the retransmission for the transmission block is dropped on the first retransmission resource by the first device.

[0011] According to an embodiment of the present disclosure, a first device performing sidelink communication is provided, the first device including at least one memory for storing instructions, at least one transceiver, and at least one processor connecting the at least one memory and the at least one transceiver, the at least one processor controlling the at least one transceiver to receive, from a base station, a sidelink grant associated with an initial transmission resource and a first retransmission resource of a transport block, controlling the at least one transceiver to transmit, to a second device, a Physical Sidelink Control Channel (PSCCH) and a Physical Sidelink Shared Channel (PSSCH) associated with the PSCCH based on the initial transmission resource, and transmitting a Physical Sidelink Feedback Channel (PSFCH) from the second device based on a slot index and a subchannel index associated with the PSSCH. determining a PSFCH resource for receiving a PSFCH for the PSSCH from the second device based on the PSFCH resource, controlling the at least one transceiver to receive the PSFCH for the PSSCH from the second device based on the PSFCH resource, comparing a time interval between the PSFCH resource and the first retransmission resource to a minimum processing time required between reception of the PSFCH and retransmission of the transmission block, and controlling the at least one transceiver to perform sidelink communication with the second device based on a comparison of the time interval and the minimum processing time,Based on the "Request" feedback being an enabled transmission block and the time interval being less than the minimum processing time, a retransmission for the transmission block is dropped on the first retransmission resource by the first device. Effect of the Invention

[0012] The terminal can efficiently carry out SL communication. [Brief description of the drawings]

[0013] [Figure 1] This is a diagram for explaining a comparison between V2X communication based on a RAT prior to NR and V2X communication based on NR. [Diagram 2] 1 illustrates a structure of an NR system according to one embodiment of the present disclosure. [Diagram 3] 1 illustrates a radio protocol architecture according to one embodiment of the present disclosure. [Figure 4] 1 illustrates a structure of an NR radio frame according to one embodiment of the present disclosure. [Diagram 5] 1 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. [Figure 6] 1 illustrates an example of a BWP according to one embodiment of the present disclosure. [Figure 7] 1 illustrates a terminal performing V2X or SL communication according to one embodiment of the present disclosure. [Figure 8] According to one embodiment of the present disclosure, a procedure in which a terminal performs V2X or SL communication depending on a transmission mode is shown. [Figure 9] 1 illustrates three cast types according to one embodiment of the present disclosure. [Figure 10] FIG. 10 illustrates a method in which a terminal that has reserved a transmission resource notifies other terminals of information related to the transmission resource according to one embodiment of the present disclosure. [Figure 11] According to one embodiment of the present disclosure, a method for a first device to perform sidelink communication with a second device based on a sidelink grant received from a base station is provided. [Figure 12] FIG. 1 is a flow diagram illustrating a method for a first device to perform sidelink communication according to one embodiment of the present disclosure. [Figure 13] FIG. 1 is a flow diagram illustrating a method for a second device to perform sidelink communication according to one embodiment of the present disclosure. [Figure 14] 1 illustrates a communication system 1 according to an embodiment of the present disclosure. [Figure 15] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 16] 1 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure. [Figure 17] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 18] 1 illustrates a mobile device according to one embodiment of the present disclosure. [Figure 19] 1 illustrates a vehicle or autonomous vehicle, according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] As used herein, "A or B" may mean "only A," "only B," or "both A and B." Also, as used herein, "A or B" may be interpreted as "A and / or B." For example, as used herein, "A, B or C" may mean "only A," "only B," "only C," or "any combination of A, B and C."

[0015] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Thus, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0016] In this specification, "at least one of A and B" can mean "only A", "only B", or "both A and B". In addition, in this specification, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted as "at least one of A and B".

[0017] In addition, in this specification, "at least one of A, B and C" can mean "only A," "only B," "only C," or "any combination of A, B and C." In addition, "at least one of A, B or C" or "at least one of A, B and / or C" can mean "at least one of A, B and C."

[0018] In addition, parentheses used in this specification may mean "for example." Specifically, when "control information (PDCCH)" is used, "PDCCH" is proposed as an example of "control information." In addition, "control information" in this specification is not limited to "PDCCH," and "PDDCH" is proposed as an example of "control information." In addition, when "control information (i.e., PDCCH)" is used, "PDCCH" is proposed as an example of "control information."

[0019] In this specification, technical features individually described in one drawing may be embodied individually or simultaneously.

[0020] The following technologies can be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented in wireless technologies such as universal terrestrial radio access (UTRA) and CDMA2000. TDMA can be implemented in wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented in wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (registered trademark) (3rd generation partnership project) LTE (long term evolution) employs OFDMA on the downlink and SC-FDMA on the uplink as part of evolved UMTS (E-UMTS) that uses evolved-UMTS terrestrial radio access (E-UTRA). LTE-A (advanced) is an evolution of 3GPP LTE.

[0021] 5G NR is a successor technology to LTE-A and is a new clean-slate type mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, including low frequency bands below 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequency (millimeter wave) bands above 24 GHz.

[0022] For clarity of explanation, the following description will focus on 5G NR, but the technical idea of ​​an embodiment of the present disclosure is not limited thereto.

[0023] 2 shows a structure of an NR system according to one embodiment of the present disclosure. The embodiment of FIG. 2 can be combined with various embodiments of the present disclosure.

[0024] Referring to FIG. 2, the NG-RAN (Next Generation-Radio Access Network) may include a base station 20 that provides a terminal 10 with protocol termination of a user plane and a control plane. For example, the base station 20 may include a gNB (next generation-NodeB) and / or an eNB (evolved-NodeB). For example, the terminal 10 may be fixed or mobile, and may be referred to as other terms such as a MS (Mobile Station), a UT (User Terminal), a SS (Subscriber Station), a MT (Mobile Terminal), a Wireless Device, etc. For example, the base station is a fixed station that communicates with the terminal 10, and may be referred to as other terms such as a BTS (Base Transceiver System), an Access Point, etc.

[0025] The embodiment of FIG. 2 illustrates a case where only gNBs are included. The base stations 20 may be connected to each other via an Xn interface. The base stations 20 may be connected to a 5th generation core network (5G Core Network: 5GC) via an NG interface. More specifically, the base station 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.

[0026] The radio interface protocol layers between a terminal and a network can be divided into L1 (first layer), L2 (second layer), and L3 (third layer) based on the three lowest layers of the Open System Interconnection (OSI) reference model widely known in communication systems. Among these, the physical layer belonging to the first layer provides an information transfer service using a physical channel, and the Radio Resource Control (RRC) layer located in the third layer plays a role in controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

[0027] FIG. 3 illustrates a radio protocol architecture according to an embodiment of the present disclosure. The embodiment of FIG. 3 can be combined with various embodiments of the present disclosure. Specifically, FIG. 3(a) illustrates a user plane radio protocol stack for Uu communication, and FIG. 3(b) illustrates a control plane radio protocol stack for Uu communication. FIG. 3(c) illustrates a user plane radio protocol stack for SL communication, and FIG. 3(d) illustrates a control plane radio protocol stack for SL communication.

[0028] Referring to FIG. 3, the physical layer provides information transfer services to a higher layer using physical channels. The physical layer is connected to a higher layer, the Medium Access Control (MAC) layer, via transport channels. Data moves between the MAC layer and the physical layer via the transport channels. Transport channels are classified according to how and what characteristics data is transmitted over the radio interface.

[0029] Data is transferred between different physical layers, i.e., between the physical layers of a transmitter and a receiver, via a physical channel, which may be modulated by an Orthogonal Frequency Division Multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.

[0030] The MAC layer provides services to the higher-level radio link control (RLC) layer via logical channels. The MAC layer provides a mapping function from multiple logical channels to multiple transport channels. The MAC layer also provides a logical channel multiplexing function by mapping multiple logical channels to a single transport channel. The MAC sublayer provides data transfer services on the logical channels.

[0031] The RLC layer performs concatenation, segmentation, and reassembly of RLC SDUs (Service Data Units). To guarantee various Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three operation modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction via automatic repeat request (ARQ).

[0032] The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transmission channels, and physical channels in relation to the configuration, re-configuration, and release of radio bearers. RB refers to the logical path provided by layer 1 (physical layer or PHY layer) and layer 2 (MAC layer, RLC layer, PDCP (Packet Data Convergence Protocol) layer, SDAP (Service Data Adaptation Protocol) layer) for data transmission between the terminal and the network.

[0033] The functions of the PDCP layer in the user plane include transmission of user data, header compression, and ciphering, and the functions of the PDCP layer in the control plane include transmission of control plane data and encryption / integrity protection.

[0034] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between QoS flows and data radio bearers, QoS flow identifier (ID) marking in downlink and uplink packets, etc.

[0035] RB configuration refers to the process of defining the characteristics of the radio protocol layer and channel to provide a specific service and setting each specific parameter and operation method. RB is divided into two types: SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). SRB is used as a path to transmit RRC messages in the control plane, and DRB is used as a path to transmit user data in the user plane.

[0036] When an RRC connection is established between the RRC layer of the terminal and the RRC layer of the base station, the terminal is in an RRC_CONNECTED state, otherwise, it is in an RRC_IDLE state. In the case of NR, an RRC_INACTIVE state is additionally defined, and a terminal in the RRC_INACTIVE state maintains a connection with the core network and can release a connection with the base station.

[0037] Downlink transport channels for transmitting data from a network to a terminal include a Broadcast Channel (BCH) for transmitting system information and a Shared Channel (SCH) for transmitting user traffic and control messages. Traffic or control messages of downlink multicast or broadcast services can be transmitted via the downlink SCH or via a separate Multicast Channel (MCH). Meanwhile, uplink transport channels for transmitting data from a terminal to a network include a Random Access Channel (RACH) for transmitting initial control messages and a Shared Channel (SCH) for transmitting user traffic and control messages.

[0038] Above the transport channel, logical channels that are mapped to the transport channel include the Broadcast Control Channel (BCCH), the Paging Control Channel (PCCH), the Common Control Channel (CCCH), the Multicast Control Channel (MCCH), and the Multicast Traffic Channel (MTCH).

[0039] 4 illustrates a structure of a radio frame for NR according to one embodiment of the present disclosure. The embodiment of FIG. 4 can be combined with various embodiments of the present disclosure.

[0040] Referring to FIG. 4, in NR, radio frames can be used for uplink and downlink transmission. A radio frame has a length of 10 ms and can be defined as two 5 ms half-frames (HF). A half-frame can include five 1 ms subframes (SF). A subframe can be divided into one or more slots, and the number of slots in a subframe can be determined by a subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM(A) symbols depending on a cyclic prefix (CP).

[0041] If normal CP is used, each slot can contain 14 symbols. If extended CP is used, each slot can contain 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), Single Carrier-FDMA (SC-FDMA) symbols (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbols).

[0042] Table 1 below shows the number of symbols per slot (N slot symb ), the number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot ) is shown below.

[0043] [Table 1]

[0044] Table 2 illustrates the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS when the extended CP is used.

[0045] [Table 2]

[0046] In the NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) can be set to be different between multiple cells merged into one terminal, and thus, the (absolute time) duration of time resources (e.g., subframes, slots, or TTIs) (commonly referred to as TUs (Time Units) for convenience) consisting of the same number of symbols can be set to be different between the merged cells.

[0047] In NR, multiple numerologies or SCSs to support various 5G services can be supported. For example, if the SCS is 15 kHz, a wide area in a traditional cellular band can be supported, and if the SCS is 30 kHz / 60 kHz, dense-urban, lower latency, and wider carrier bandwidth can be supported. If the SCS is 60 kHz or higher, a bandwidth larger than 24.25 GHz can be supported to overcome phase noise.

[0048] The NR frequency band can be defined into two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The values ​​of the frequency ranges can be changed, and for example, the two types of frequency ranges are as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean the "sub 6GHz range" and FR2 can mean the "above 6GHz range" and can be called millimeter wave (mmW).

[0049] [Table 3]

[0050] As described above, the values ​​of the frequency range of the NR system may be changed. For example, FR1 may include a band of 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, the frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher included in FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, for example, for communication for vehicles (e.g., autonomous driving).

[0051] [Table 4]

[0052] 5 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. The embodiment of FIG. 5 can be combined with various embodiments of the present disclosure.

[0053] 5, a slot includes a number of symbols in the time domain. For example, in the case of the normal CP, one slot may include 14 symbols, and in the case of the extended CP, one slot may include 12 symbols. Alternatively, in the case of the normal CP, one slot may include 7 symbols, and in the case of the extended CP, one slot may include 6 symbols.

[0054] A carrier includes a plurality of subcarriers in the frequency domain. A resource block (RB) can be defined as a plurality (e.g., 12) of consecutive subcarriers in the frequency domain. A bandwidth part (BWP) can be defined as a plurality of consecutive (P)RBs ((Physical) Resource Blocks) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed via an activated BWP. Each element is called a resource element (RE) in the resource grid, and one complex symbol can be mapped to it.

[0055] The following explains BWP (Bandwidth Part) and carriers.

[0056] A Bandwidth Part (BWP) is a contiguous set of physical resource blocks (PRBs) in a given numerology. A PRB can be selected from a contiguous subset of common resource blocks (CRBs) for a given numerology on a given carrier.

[0057] For example, the BWP is at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor downlink radiolink quality in DL BWPs other than an active DL BWP on a primary cell (PCell). For example, the UE does not receive a PDCCH, a physical downlink shared channel (PDSCH), or a CSI-RS (reference signal) (without RRM) outside an active DL BWP. For example, the UE does not trigger a CSI (Channel State Information) report for an inactive DL BWP. For example, the UE does not transmit a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel) outside an active UL BWP. For example, when in the downlink, the initial BWP is given as a contiguous RB set for a remaining minimum system information (RMSI) CORESET (control resource set) (set by a physical broadcast channel (PBCH)). For example, in the uplink, the initial BWP is provided by a system information block (SIB) for a random access procedure. For example, the default BWP is configured by a higher layer. For example, the initial value of the default BWP is the initial DL BWP. In order to save energy, when the terminal cannot detect DCI for a certain period of time, the terminal can switch the active BWP of the terminal to the default BWP.

[0058] Meanwhile, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting terminal can transmit an SL channel or an SL signal on a specific BWP, and a receiving terminal can receive an SL channel or an SL signal on the specific BWP. In a licensed carrier, an SL BWP can be defined separately from a Uu BWP, and the SL BWP can have separate configuration signaling from the Uu BWP. For example, a terminal can receive a configuration for an SL BWP from a base station / network. For example, a terminal can receive a configuration for a Uu BWP from a base station / network. An SL BWP can be (pre) configured for out-of-coverage NR V2X terminals and RRC_IDLE terminals in a carrier. At least one SL BWP can be activated in a carrier for a terminal in an RRC_CONNECTED mode.

[0059] 6 shows an example of a BWP according to an embodiment of the present disclosure. The embodiment of FIG. 6 can be combined with various embodiments of the present disclosure. In the embodiment of FIG. 6, it is assumed that there are three BWPs.

[0060] Referring to Figure 6, CRB (common resource block) is a carrier resource block numbered from one end of a carrier band to the other end, and PRB is a resource block numbered within each BWP. Point A may indicate a common reference point for a resource block grid.

[0061] BWP is point A, offset from point A (N start BWP ) and bandwidth (N size BWP) For example, point A is the external reference point of the PRB of the carrier to which subcarrier 0 of all numerologies (e.g., all numerologies supported by the network on the carrier) is aligned. For example, the offset is the PRB spacing between the lowest subcarrier in a given numerology and point A. For example, the bandwidth is the number of PRBs in a given numerology.

[0062] The following describes V2X or SL communication.

[0063] The SLSS (Sidelink Synchronization Signal) is a SL-specific sequence and may include a PSSS (Primary Sidelink Synchronization Signal) and a SSSS (Secondary Sidelink Synchronization Signal). The PSSS may be referred to as an S-PSS (Sidelink Primary Synchronization Signal), and the SSSS may be referred to as an S-SSS (Sidelink Secondary Synchronization Signal). For example, length-127 M-sequences may be used for the S-PSS, and length-127 Gold sequences may be used for the S-SSS. For example, the terminal may perform initial signal detection and obtain synchronization using the S-PSS. For example, the terminal may obtain detailed synchronization and detect a synchronization signal ID using the S-PSS and S-SSS.

[0064] The PSBCH (Physical Sidelink Broadcast Channel) is a (broadcast) channel that transmits basic (system) information that a terminal should know first before transmitting and receiving an SL signal. For example, the basic information includes information related to SLSS, duplex mode (DM), TDDUL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool related information, application type related to SLSS, subframe offset, broadcast information, etc. For example, for evaluation of PSBCH performance, in NR V2X, the size of the PSBCH payload is 56 bits including a 24-bit CRC (Cyclic Redundancy Check).

[0065] The S-PSS, S-SSS, and PSBCH can be included in a block format (e.g., an SLSS (Synchronization Signal) / PSBCH block, hereinafter, S-SSB (Sidelink-Synchronization Signal Block)) that supports periodic transmission. The S-SSB can have the same numerology (i.e., SCS and CP length) as a PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) in a carrier, and the transmission bandwidth is within a (pre-) configured SL BWP (Sidelink Bandwidth Part). For example, the bandwidth of the S-SSB is 11 RBs (Resource Blocks). For example, the PSBCH spans 11 RBs. And the frequency location of the S-SSB can be (pre-) configured. Therefore, the terminal does not need to perform hypothesis detection in frequency to find the S-SSB in the carrier.

[0066] 7 illustrates a terminal performing V2X or SL communication according to an embodiment of the present disclosure. The embodiment of FIG. 7 can be combined with various embodiments of the present disclosure.

[0067] 7, the term terminal in V2X or SL communication may mainly mean a user terminal. However, when a network device such as a base station transmits and receives a signal by a communication method between terminals, the base station may also be considered as a kind of terminal. For example, terminal 1 is a first device 100, and terminal 2 is a second device 200.

[0068] For example, terminal 1 can select a resource unit corresponding to a specific resource in a resource pool, which means a collection of resources. Then, terminal 1 can transmit an SL signal using the resource unit. For example, terminal 2, which is a receiving terminal, can receive a setting of a resource pool to which terminal 1 can transmit a signal, and can detect a signal of terminal 1 in the resource pool.

[0069] Here, when the terminal 1 is within the connection range of the base station, the base station can inform the terminal 1 of the resource pool. On the other hand, when the terminal 1 is outside the connection range of the base station, other terminals can inform the resource pool, or the terminal 1 can use a pre-configured resource pool.

[0070] In general, a resource pool may be composed of multiple resource units, and each terminal may select one or multiple resource units to use for transmitting its SL signal.

[0071] The following describes resource allocation in SL.

[0072] FIG. 8 illustrates a procedure in which a terminal performs V2X or SL communication according to a transmission mode according to an embodiment of the present disclosure. The embodiment of FIG. 8 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 convenience of explanation, in LTE, the transmission mode may be referred to as an LTE transmission mode, and in NR, the transmission mode may be referred to as an NR resource allocation mode.

[0073] For example, (a) of FIG. 8 illustrates a terminal operation associated with LTE transmission mode 1 or LTE transmission mode 3. Or, for example, (a) of FIG. 8 illustrates a terminal operation associated with NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to general SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0074] For example, (b) of FIG. 8 illustrates terminal operation associated with LTE transmission mode 2 or LTE transmission mode 4. Or, for example, (b) of FIG. 8 illustrates terminal operation associated with NR resource allocation mode 2.

[0075] Referring to (a) of FIG. 8, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, a base station can schedule SL resources used by a terminal for SL transmission. For example, a base station can perform resource scheduling for terminal 1 via a PDCCH (e.g., Downlink Control Information (DCI)) or RRC signaling (e.g., Configured Grant Type 1 or Configured Grant Type 2), and terminal 1 can perform V2X or SL communication with terminal 2 through the resource scheduling. For example, terminal 1 can transmit Sidelink Control Information (SCI) to terminal 2 via a Physical Sidelink Control Channel (PSCCH), and then transmit data based on the SCI to terminal 2 via a Physical Sidelink Shared Channel (PSSCH).

[0076] Referring to (b) of FIG. 8, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal may determine an SL transmission resource within a SL resource configured by a base station / network or a preconfigured SL resource. For example, the configured SL resource or the preconfigured SL resource is a resource pool. For example, the terminal may autonomously select or schedule a resource for SL transmission. For example, the terminal may autonomously select a resource within a configured resource pool to perform SL communication. For example, the terminal may perform sensing and resource (re)selection procedures and autonomously select a resource within a selection window. For example, the sensing may be performed on a subchannel basis. Then, the terminal 1 that autonomously selects a resource within a resource pool may transmit an SCI to the terminal 2 via a PSCCH, and then transmit data based on the SCI to the terminal 2 via a PSSCH.

[0077] FIG. 9 illustrates three cast types according to an embodiment of the present disclosure. The embodiment of FIG. 9 can be combined with various embodiments of the present disclosure. Specifically, FIG. 9 (a) illustrates broadcast type SL communication, FIG. 9 (b) illustrates unicast type SL communication, and FIG. 9 (c) illustrates groupcast type SL communication. In the case of unicast type SL communication, a terminal can perform one-to-one communication with another terminal. In the case of groupcast type SL communication, a terminal can perform SL communication with one or more terminals in a group to which the terminal belongs. In various embodiments of the present disclosure, the SL groupcast communication can be replaced with SL multicast communication, SL one-to-many communication, etc.

[0078] On the other hand, in NR V2X communication or NR sidelink communication, the transmitting terminal can reserve / select one or more transmission resources for sidelink transmission (e.g., initial transmission and / or retransmission), and the transmitting terminal can inform the receiving terminal of information regarding the location of the one or more transmission resources.

[0079] On the other hand, when performing sidelink communication, the method in which the transmitting terminal reserves or predetermines transmission resources for the receiving terminal is typically in the following form.

[0080] For example, the transmitting terminal can reserve transmission resources on a chain basis. Specifically, for example, when the transmitting terminal reserves K transmission resources, the transmitting terminal can transmit or inform the receiving terminal of location information of less than K transmission resources via an SCI transmitted to the receiving terminal at any (or specific) transmission time or time resource. That is, for example, the SCI includes location information of less than K transmission resources. Or, for example, when the transmitting terminal reserves K transmission resources related to a specific TB, the transmitting terminal can inform or transmit location information of less than K transmission resources to the receiving terminal via an SCI transmitted to the receiving terminal at any (or specific) transmission time or time resource. That is, the SCI includes location information of less than K transmission resources. In this case, for example, the transmitting terminal signals only location information of less than K transmission resources to the receiving terminal via one SCI transmitted at any (or specific) transmission time or time resource, thereby preventing performance degradation due to a transient increase in SCI payload.

[0081] 10 illustrates a method for a terminal that has reserved a transmission resource to inform other terminals of information related to the transmission resource according to one embodiment of the present disclosure. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure.

[0082] Specifically, for example, (a) of FIG. 10 shows a method of performing chain-based resource reservation by transmitting / signaling (maximum) two transmission resource position information to a receiving terminal via one SCI when the K value is 4. For example, (b) of FIG. 10 shows a method of performing chain-based resource reservation by transmitting / signaling (maximum) three transmission resource position information to a receiving terminal via one SCI when the K value is 4. For example, referring to (a) and (b) of FIG. 10, the transmitting terminal can transmit / signal only the fourth transmission-related resource position information to the receiving terminal via the fourth (or last) transmission-related PSCCH. For example, referring to (a) of FIG. 10, the transmitting terminal can transmit / signal not only the fourth transmission-related resource position information but also the third transmission-related resource position information to the receiving terminal via the fourth (or last) transmission-related PSCCH. For example, referring to (b) of FIG. 10, the transmitting terminal may transmit / signal not only the fourth transmission-related resource position information but also the second transmission-related resource position information and the third transmission-related resource position information to the receiving terminal via the fourth (or last) transmission-related PSCCH. In this case, for example, in (a) and (b) of FIG. 10, when the transmitting terminal transmits / signals only the fourth transmission-related resource position information to the receiving terminal via the fourth (or last) transmission-related PSCCH, the transmitting terminal may set or designate the position information field / bit of the unused or remaining transmission resources to a preset value (e.g., 0). For example, in (a) and (b) of FIG. 10, when the transmitting terminal transmits / signals only the fourth transmission-related resource position information to the receiving terminal via the fourth (or last) transmission-related PSCCH, the transmitting terminal may set or designate the position information field / bit of the unused or remaining transmission resources to indicate a preset state / bit value indicating the last transmission (of four transmissions).

[0083] Meanwhile, for example, a transmitting terminal may perform reservation of transmission resources on a block basis. Specifically, for example, when a transmitting terminal performs reservation of K transmission resources, the transmitting terminal may transmit or inform all of the location information related to the K transmission resources to the receiving terminal via the SCI transmitted to the receiving terminal at any (or specific) transmission time or time resource. That is, the SCI includes the location information of the K transmission resources. For example, when a transmitting terminal performs reservation of K transmission resources related to a specific TB, the transmitting terminal may transmit or inform all of the location information related to the K transmission resources to the receiving terminal via the SCI transmitted to the receiving terminal at any (or specific) transmission time or time resource. That is, the SCI includes the location information of the K transmission resources. For example, (c) of FIG. 10 shows a method of performing block-based resource reservation by a transmitting terminal signaling four transmission resource location information to a receiving terminal via one SCI when the value of K is 4.

[0084] FIG. 11 illustrates a method for a first device to perform sidelink communication with a second device based on a sidelink grant received from a base station according to one embodiment of the present disclosure.

[0085] In step S1110, the first device according to an embodiment may receive a sidelink grant associated with initial transmission resources and retransmission resources of a transmission block from the base station. In step S1120, the first device may transmit a PSCCH and a PSSCH associated with the PSCCH based on the initial transmission resources. In step S1130, the first device may determine a PSFCH resource for receiving a PSFCH from the second device based on a slot index and a subchannel index associated with the PSSCH. In step S1140, the first device may receive a PSFCH associated with the PSSCH based on the PSFCH resource. In step S1150, the first device may compare a time interval between the PSFCH resource and the retransmission resource with a minimum processing time required between receiving the PSFCH and retransmitting the transmission block. In step S1160, the first device may perform sidelink communication with the second device based on a comparison of the time interval and the minimum processing time.

[0086] In the following, embodiments and / or examples directly or indirectly related to at least one of steps S1110 to S1160 will be discussed. Meanwhile, the following embodiments and / or examples are only related to at least one of steps S1110 to S1160, and even if the following embodiments and / or examples and at least one of steps S1110 to S1160 are mutually arranged in content, the arranged content should not be interpreted as departing from the scope of the present specification.

[0087] [Proposed method #1]: As an example, MODE 1 operation is set according to the following (part of) rules. Also, as an example, whether to apply the proposed method of the present disclosure and related parameters can be set differently depending on MODE 1 CG (and / or MODE 1 DG), service type (and / or priority), QOS (Quality of Service) requirements (e.g., latency, reliability), cast type (e.g., unicast, groupcast, broadcast), HARQ feedback option (e.g., (TX-RX distance-based) NACK ONLY feedback, ACK / NACK feedback), etc.

[0088] For example, during MODE 1 CG operation, the terminal may be configured to report the remaining value of the TB-related maximum allowable retransmission count (MAX_RENUM) set in the form of "PER PRIORITY PER CG" (and / or "PER HARQ PROCESS ID") to the base station (via predefined signaling (e.g., PUCCH, PUSCH)). Here, for example, the report may be composed of information such as the remaining retransmission count and / or (related) HARQ PROCESS ID and / or (related) CG INDEX and / or (related) (service / traffic) PRIORITY. When the above rule is applied, for example, the base station may reduce waste of additional retransmission resource allocation via DG DCI.

[0089] For example, MAX_RENUM (as described above) may be shared between a CG resource-based retransmission operation and a retransmission resource-based retransmission operation further allocated via a DG DCI (linked with a CG resource). Here, as an example, when this rule is applied, service-related QOS requirements (e.g., RELIABILITY) can be efficiently satisfied.

[0090] For example, the SIZE ALIGNMENT operation between MODE 1 DCI and UU DCI shall not be performed if the UU DCI FORMAT size budget used (e.g., the total number is four or less, but at the same time, the number of different DCI FORMAT SIZEs scrambled into C-RNTI must be three or less) is less than four (and / or the size budget related to the UU DCI FORMAT scrambled into C-RNTI used is less than three (e.g., the SIZE FITTING target of MODE 1 DCI is limited to the UU DCI FORMAT scrambled into C-RNTI) and / or the remaining size budget (i.e., 1) excluding the (maximum) size budget related to the UU DCI FORMAT scrambled into C-RNTI is not used (e.g., the SIZE FITTING target of MODE 1 DCI is limited to the remaining UU DCI FORMAT excluding the UU DCI FORMAT scrambled into C-RNTI)). A size alignment operation is not applied between DCIs, otherwise, a UU DCI FORMAT (scrambled by C-RNTI or not scrambled by C-RNTI) that requires the least amount of zero padding from the viewpoint of MODE 1 DCI is selected, and a size alignment operation is applied between this and MODE 1 DCI, or a UU DCI FORMAT that has the least difference in size between MODE 1 DCI and UU DCI FORMRAT (scrambled by C-RNTI or not scrambled by C-RNTI) is selected, and a size of a relatively small DCI is fitted to the maximum value of the UU DCI FORMAT size and MODE 1 DCI size. Here, as an example, when the above rule is applied, if the total number of blind decodes required (on one slot) (and / or the total number of NON-OVERLAPPED CCEs related to channel estimation) exceeds a (pre-set) maximum allowable number, processing may be performed according to the conventional UU rule.Also, as an example, the above rule is applied (limitedly) only when a (specific) UU DCI format that has been pre-specified as a (mutual) size fitting target of the MODE 1 DCI is not set to be monitored.

[0091] For example, the resource reservation period field size on the SCI is fixed to 4 bits, and the number of resource reservation period candidates that can be set by the base station / network specifically for the MODE 2 resource pool (and / or MODE 2 UE) is more than 16. As an example, when different TX pools (e.g., MODE 1 / 2 TX pools) overlap (and / or MODE 1 UE and MODE 2 UE coexist on the same TX pool), if the understanding / interpretation of the resource reservation period value on the SCI does not match between TX UEs based on different TX pools (or TX UEs based on different MODEs), sensing and resource exclusion operations cannot be performed efficiently. In consideration of this, as an example, when a MODE 1 resource pool is configured, the resource reservation period candidate values ​​(e.g., up to 16) allowed (on the resource pool) may be signaled (by the base station / network). Here, as an example, when this rule is applied, the MODE 1 CG resource-related reservation period value is selected only (limitedly) from among the resource reservation period candidate values ​​configured specifically for the MODE 1 resource pool. Also, as an example, when the above-described rule is applied, the MODE 1 CG type 1 resource-related (compared to SFN 0) (physical slot) offset value can be set as one value within the range from "0" to "the maximum value (MS)-1 of the resource reservation period candidates set in the MODE 1 resource pool."

[0092] For example, if different HARQ PROCESS ID allocation (e.g., RRC) is possible between MODE 1 CGs, the CG index field on the additional retransmission resource allocation related DG DCI (ADRSC_DCI) is not required. In such a case, as an example, size fitting is applied between the ADRSC_DCI and the MODE 1 CG type 2 ACTIVATION (and / or RELEASE) DCI.

[0093] For example, when configuring MODE 1 CG resources, resources related to a particular CG period (PERIOD) #X may be located within another (adjacent) CG period #Y. Here, as an example, when the rule is applied, resources related to different CG periods may be configured not to overlap (in part or in whole) (in the time domain). As another example, when resources related to different CG periods overlap (in part or in whole) (in the time domain), it may be considered that CG resources related to a relatively low priority packet transmission (and / or a relatively early (or subsequent) period in the time domain) are dropped.

[0094] For example, the TX UE is allowed to select only a portion of the configured MODE 1 CG resources (e.g., the signaling on the SCI is longer than the CG resource reservation period configured by the base station, or the signaling on the SCI is shorter than the CG frequency resource size configured by the base station) and signal related information to another terminal on the SCI.

[0095] [Proposed Method #2]: As an example, if a pre-configured UU communication (e.g., communication between a base station and a terminal)-related (USS (or CSS)) (NON-FALLBACK (or FALLBACK)) DCI FORMAT (e.g., DCIFORMAT0_1 (or DCIFORMAT0_0)) (REF_DCI) with a matching payload size (NR SL MODE 1 (and / or LTE SL MODE 3 SPS scheduled by NR UU)) (SL_DCI) is not present / monitored (on the same search space (and / or CORESET)), the SL_DCI is present / monitored UU communication-related (USS (or CSS)) (NON-FALLBACK (or FALLBACK)) DCI FORMAT (e.g., DCIFORMAT0_1 (or DCIFORMAT0_0)) (REF_DCI) is not present / monitored (on the same search space (and / or CORESET)). A size fitting operation is performed with the FORMAT with the smallest payload size difference with the SL_DCI (or a pre-configured UU communication-related (fallback (or non-fallback)) DCI FORMAT (e.g., DCI FORMAT0_0) existing on the USS (or CSS)). Here, as an example, this rule is applied only when the terminal's DCI format size budget is already fully used for the UU communication-related (USS or CSS) DCI FORMAT.

[0096] [Proposed Method #3]: As an example, (when multiple resource pools are configured during SL MODE 1 operation), the (linked) resource pool (index) information field may be defined only on the (SL-RNTI (and / or SL-CS-RNTI)-based) SL MODE 1 DG DCI FORMAT (e.g., in some cases only when the transmission is performed via the SL MODE 1 DG from the initial transmission) (e.g., DCI FORMAT3_0), and / or the base station / network may notify the terminal of the resource pool information linked to the SL MODE 1 DG DCI FORMAT described above via pre-defined signaling (e.g., RRC) (e.g., there is no need for the (linked) resource pool (index) information field to be defined on the (above-described) DCI FORMAT). Also, as an example, the resource pool (index) information field (described above) may not be defined on the SL CROSS-RAT DCI FORMAT (e.g., DCI FORMAT3_1) used when an NR UU schedules LTE SL MODE 3 SPS, and / or the field may exist but be specified (e.g., for virtual CRC use) to a pre-configured value (e.g., 0).

[0097] [Proposed Method #4]: As an example, from the perspective of a TX UE (for a particular TB), a minimum processing time value (MIN_PR) required between PSFCH reception (from a RX UE) and PSCCH / PSSCH retransmission is defined. Here, as an example, in MODE 1 operation, the terminal can expect the base station to allocate / schedule retransmission resources that satisfy MIN_PR between PSFCH reception and PSCCH / PSSCH retransmission only when the following (some) conditions (for the same TB) are satisfied:

[0098] For example, one condition is that at least one LCH (logical channel) with activated HARQ feedback is assigned / scheduled with a mapped MODE 1 CG SL grant (and / or all assigned LCHs are assigned / scheduled with MODE 1 CG SL grants with the HARQ feedback activated characteristic).

[0099] And / or, for example, one condition may be if a MODE 1 DG SL grant (and / or a MODE 1 CG SL grant) is assigned / scheduled (and / or the MODE 1 SL grant is assigned / scheduled for a resource pool for which a PSFCH is configured (or not configured) and / or if a PUCCH resource is configured (or not configured) for the MODE 1 SL grant).

[0100] As another example, in the case where all assigned LCHs are assigned / scheduled with MODE 1 CG SL grants having the characteristic that HARQ feedback is deactivated (DISABLED) (and / or where MODE 1 DG SL grants are assigned / scheduled, and / or where MODE 1 SL grants are configured / scheduled for a resource pool where PSFCH is not configured (or configured), and / or where PUCCH resources are not configured (or configured) for the MODE 1 SL grant), as an exception, the terminal can be configured not to expect the base station to assign / schedule retransmission resources that satisfy the MIN_PR between PSFCH reception and PSCCH / PSSCH retransmission (for the same TB). As an example, if the base station assigns / schedules a MODE 1 SL grant to a terminal having (partial or complete) retransmission resources that do not satisfy the MIN_PR between PSFCH reception and PSCCH / PSSCH retransmission (for the same TB), it may also be possible for the terminal not to perform MAC PDU transmissions for which HARQ feedback is required (based on data related to an LCH for which HARQ feedback is activated) for the associated resources (and / or MODE 1 SL grant) (and / or to only perform MAC PDU transmissions for which blind retransmissions are required (of LCH-related data for which HARQ feedback is deactivated)). Also, as an example, a MODE 1 SL grant with retransmission resources for which the MIN_PR between PSFCH reception and PSCCH / PSSCH retransmission is satisfied (for the same TB) is allocated / scheduled by the base station and used for MAC PDU transmission for which HARQ feedback is required (based on data related to an LCH for which HARQ feedback is activated), but if further allocated retransmission resources (via the DG) do not satisfy the MIN_PR between PSFCH reception and PSCCH / PSSCH retransmission, it can be configured to omit (and / or perform BLIND retransmission) the (remaining) associated TB (re)transmissions.Also, by way of example, the TX UE may expect the base station to assign / schedule at least one of the MODE 1 CG grants (and / or DG grants) to satisfy the MIN_PR (and / or have PUCCH resources) between PSFCH reception and PSCCH / PSSCH retransmission (for a resource pool configured with PSFCH resources and / or if the TX UE intends to perform a service (and / or LCH) related transmission for which HARQ feedback based retransmission is required). Also, by way of example, the TX UE may expect that (unlike MODE 1 CG) MODE 1 DG is (always) assigned / scheduled to satisfy the MIN_PR (for a resource pool configured with PSFCH) between PSFCH reception and PSCCH / PSSCH retransmission (for a resource pool configured with PSFCH). As an example, in the case of DG (and / or CG), if the TX UE reports to the base station only data information (e.g., BSR (buffer status report), (predicted) TRAFFIC GENERATION PERIOD / SIZE), etc.) related to the LCH for which HARQ feedback is activated (and / or reports that (at least one) HARQ feedback includes the LCH for which the LCH is activated and related data information), it may expect to be assigned / scheduled retransmission resources that satisfy the MIN_PR between PSFCH reception and PSCCH / PSSCH retransmission. In addition, as an example, whether to apply the proposed method of the present disclosure and related parameters can be set differently depending on MODE 1 CG (and / or MODE 1 DG), service type (and / or priority), QOS requirements (e.g., delay, reliability), cast type (e.g., unicast, groupcast, broadcast), HARQ feedback option (e.g., (TX-RX distance based) NACK ONLY feedback, ACK / NACK feedback), (resource pool) congestion level (e.g., CBR), whether PUCCH-based SL HARQ reporting is configured (e.g., in the case of MODE 1 GRANT with PUCCH resources configured, the proposed method is applied), etc.Furthermore, as an example, it is also possible to set the following rules (some of them) to be applied:

[0101] [Proposed method #5]: As an example, on the other hand, the length of the PSSCH symbol period in the form of a sidelink CSI reference resource is the number of SL symbols in an SL slot minus the PSCCH symbol period and / or the AGC symbol (the first symbol in the SL slot) and / or the TX-RX switch symbol (the last symbol in the SL slot). For example, the length of the PSCCH symbol period is a value (pre-configured) for the resource pool that triggered the CSI report, or is a specific fixed value (e.g., 2 or 3). For example, the AGC symbol is also an area that is actually transmitted, so it is not excluded in the length of the reference PSSCH symbol period. Or, for example, since excluding the PSCCH overhead on a symbol-by-symbol basis may result in an excessive value, a total symbol overhead value can be set to 3 for all or part of the multiple overheads. That is, the length of the symbol period for the PSSCH in the SL CSI reference resource is the number of SL symbols in the SL slot minus 3.

[0102] [Proposed method #6]: As an example, on the other hand, it can be considered that PUCCH is transmitted via SCell (PUCCH SCell as follows), and in this case, it is necessary to define / configure whether SL HARQ-ACK report for SL CG type 1 is transmitted via PCell or PUCCH SCell. For example, a cell transmitting the SL HARQ-ACK report or PUCCH is determined by a UL carrier associated with an SL carrier in which an SL resource of SL CG type 1 is transmitted. For example, the UL carrier is again linked to a specific DL carrier, and the DL carrier again may belong to a specific cell group, and the SL HARQ-ACK report or PUCCH of SL CG type 1 is transmitted to the cell by a PUCCH cell corresponding to the cell group. The DL carrier is linked to the UL carrier based on same-carrier-scheduling, or is a scheduling cell configured for the UL carrier in cross-slot-scheduling. On the other hand, the SL carrier is an ITS carrier, and in this case, there may be no cell group information linked to the carrier. For example, when SL CG type 1 is transmitted in the ITS band, the SL HARQ-ACK report or PUCCH is transmitted to the PCell (and / or PSCell and / or PUCCH SCell and / or a pre-configured Cell (among PCell, PSCell and PUCCH SCell)). On the other hand, when PUCCH transmission is configured for SL CG type 1, the UE can expect to receive DCI for allocating a retransmission resource for the CG resource from a specific DL carrier again. For example, the cell from which the SL HARQ-ACK report or PUCCH for SL CG type 1 is transmitted is determined based on the DL carrier or cell from which the retransmission DCI for the CG resource is transmitted.For example, a cell that transmits a SL HARQ-ACK report or a PUCCH is determined by a cell group linked to a DL carrier to which a retransmission DCI for the CG resource is transmitted. For example, a cell that transmits a SL HARQ-ACK report or a PUCCH for SL CG type 1 is determined by a DL cell to which RRC information for the CG resource is transmitted. For example, a cell that transmits a SL HARQ-ACK report or a PUCCH is determined by a cell group linked to a DL cell to which RRC information for the CG resource is transmitted.

[0103] FIG. 12 is a flow diagram illustrating a method for a first device to perform sidelink communication according to one embodiment of the present disclosure.

[0104] The operations disclosed in the flow diagram of FIG. 12 may be performed in combination with various embodiments of the present disclosure. In one example, the operations disclosed in the flow diagram of FIG. 12 are performed based on at least one of the devices shown in FIG. 14 to FIG. 19. In one example, the first device in FIG. 12 corresponds to the first wireless device 100 in FIG. 15 described below, and the second device corresponds to the second wireless device 200 in FIG. 15. In another example, the first device in FIG. 12 corresponds to the second wireless device 200 in FIG. 15 described below, and the second device corresponds to the first wireless device 100.

[0105] In step S1210, the first device according to one embodiment may receive a sidelink grant from the base station, the sidelink grant being associated with an initial transmission resource and a first retransmission resource of a transport block.

[0106] In step S1220, the first device according to one embodiment can transmit a PSCCH (Physical Sidelink Control Channel) and a PSSCH (Physical Sidelink Shared Channel) related to the PSCCH to the second device based on the initial transmission resource.

[0107] In step S1230, the first device of one embodiment can determine a PSFCH resource for receiving a PSFCH (Physical Sidelink Feedback Channel) from the second device based on a slot index and a subchannel index associated with the PSSCH.

[0108] In step S1240, the first device according to one embodiment may receive the PSFCH related to the first PSSCH from the second device based on the PSFCH resource.

[0109] In step S1250, the first device of one embodiment may compare the time interval between the PSFCH resource and the first retransmission resource with a minimum processing time required between receiving the PSFCH and retransmitting the transmission block.

[0110] In step S1260, the first device according to one embodiment may perform sidelink communication with the second device based on a comparison between the time interval and the minimum processing time.

[0111] In one embodiment, the transmission block is a transmission block for which sidelink Hybrid Automatic Repeat Request (HARQ) feedback is enabled, and retransmission for the transmission block is dropped on the first retransmission resource by the first device based on the time interval being less than the minimum processing time.

[0112] In one embodiment, the transmission block with activated sidelink HARQ feedback is a transmission block to which a logical channel (LCH) with activated sidelink HARQ feedback is mapped.

[0113] In one embodiment, based on the time interval being smaller than the minimum processing time, the transmission blocks for which the sidelink HARQ feedback is activated are not transmitted to the second device and the transmission blocks for which the sidelink HARQ feedback is disabled are transmitted to the second device.

[0114] In one embodiment, based on the activation of Channel State Information (CSI) reporting, the symbol set for the PSSCH in a sidelink slot may not include an AGC symbol and a symbol for transmit-to-receive conversion.

[0115] In an embodiment, the symbol set for the PSSCH may include symbols other than the AGC symbol and the symbol for the transmit-receive conversion among the sidelink symbols included in the sidelink slot.

[0116] In one embodiment, the total number of symbols included in the symbol set for the PSSCH is the total number of sidelink symbols included in the sidelink slot minus two.

[0117] In one embodiment, the AGC symbol is the first symbol in time in the sidelink slot and the symbol for transmit to receive conversion is the last symbol in time in the sidelink slot.

[0118] In one embodiment, the total number of symbols included in the symbol set for the PSSCH is configured for a resource pool that triggered the CSI report.

[0119] According to an embodiment, the first device may transmit a PUCCH (Physical Uplink Control Channel) related to a sidelink HARQ feedback for the sidelink grant to the base station based on the PSFCH, and may receive a DCI (Downlink Control Information) including information on a second retransmission resource related to the sidelink grant from the base station.

[0120] In one embodiment, the cell for transmission of the PUCCH is determined based on the cell from which the DCI is expected to be received.

[0121] In one embodiment, the information on the second retransmission resource is included in a dynamic grant scrambled into a sidelink-configured scheduling-radio network temporary identifier (SL-CS-RNTI).

[0122] In one embodiment, the sidelink grant is received based on RRC signaling from the base station, and a type of the sidelink grant is a sidelink configured grant (CG) type 1.

[0123] According to an embodiment of the present disclosure, there is provided a first device performing sidelink communication. The first device includes at least one memory for storing instructions, at least one transceiver, and at least one processor connecting the at least one memory and the at least one transceiver, the at least one processor controlling the at least one transceiver to receive a sidelink grant associated with an initial transmission resource and a first retransmission resource of a transport block from a base station, controlling the at least one transceiver to transmit a Physical Sidelink Control Channel (PSCCH) and a Physical Sidelink Shared Channel (PSSCH) associated with the PSCCH based on the initial transmission resource to a second device, and transmitting a Physical Sidelink Feedback Channel (PSFCH) from the second device based on a slot index and a subchannel index associated with the PSSCH. determining a PSFCH resource for receiving a PSFCH for the PSSCH from the second device based on the PSFCH resource, controlling the at least one transceiver to receive the PSFCH for the PSSCH from the second device based on the PSFCH resource, comparing a time interval between the PSFCH resource and the first retransmission resource to a minimum processing time required between reception of the PSFCH and retransmission of the transmission block, and controlling the at least one transceiver to perform sidelink communication with the second device based on a comparison of the time interval and the minimum processing time, wherein the transmission block is a sidelink Hybrid Automatic Repeat Request (HARQ) based on the comparison of the time interval and the minimum processing time.Based on the "Request" feedback being an enabled transmission block and the time interval being less than the minimum processing time, a retransmission for the transmission block is dropped on the first retransmission resource by the first device.

[0124] According to an embodiment of the present disclosure, there is provided an apparatus (or a chip (set)) for controlling a first terminal. The apparatus includes at least one processor and at least one memory coupled to be executed by the at least one processor and storing instructions, the instructions being executed by the at least one processor such that the first terminal: receives, from a base station, a sidelink grant associated with an initial transmission resource and a first retransmission resource of a transport block; transmits, to a second device, a Physical Sidelink Control Channel (PSCCH) and a Physical Sidelink Shared Channel (PSSCH) associated with the PSCCH based on the initial transmission resource; determines a PSFCH resource for receiving a Physical Sidelink Feedback Channel (PSFCH) from the second device based on a slot index and a subchannel index associated with the PSSCH; receives from the second device the PSFCH for the PSSCH based on the PSFCH resource; and determines a time interval between the PSFCH resource and the first retransmission resource. and comparing a time interval (amount of time required for a transmission block) between reception of the PSFCH and a retransmission of the transmission block with a minimum processing time required between reception of the PSFCH and a retransmission of the transmission block, and performing sidelink communication with the second device based on a comparison of the time interval and the minimum processing time, wherein the first device drops retransmission of the transmission block on the first retransmission resource based on the transmission block being a transmission block for which sidelink Hybrid Automatic Repeat Request (HARQ) feedback is enabled and the time interval is less than the minimum processing time.

[0125] In one example, the first terminal of the embodiment represents the first device described throughout this disclosure. In one example, the at least one processor, the at least one memory, etc. in the device that controls the first terminal may be implemented on separate subchips, or at least two or more components may be implemented via one subchip.

[0126] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium for storing instructions is provided. The non-transitory computer-readable storage medium, when the instructions are executed, causes the first device to: receive from a base station a sidelink grant associated with an initial transmission resource and a first retransmission resource of a transport block; transmit to a second device a Physical Sidelink Control Channel (PSCCH) and a Physical Sidelink Shared Channel (PSSCH) associated with the PSCCH based on the initial transmission resource; determine a PSFCH resource for receiving a Physical Sidelink Feedback Channel (PSFCH) from the second device based on a slot index and a subchannel index associated with the PSSCH; receive from the second device the PSFCH for the PSSCH based on the PSFCH resource; and determine a time interval between the PSFCH resource and the first retransmission resource to be equal to or greater than a minimum processing time required between receiving the PSFCH and retransmitting the transport block. and performing sidelink communication with the second device based on a comparison of the time interval and the minimum processing time, wherein the first device drops a retransmission for the transmission block on the first retransmission resource based on the time interval being smaller than the minimum processing time, the transmission block being a transmission block for which sidelink Hybrid Automatic Repeat Request (HARQ) feedback is enabled, and the first device drops a retransmission for the transmission block on the first retransmission resource based on the time interval being smaller than the minimum processing time.

[0127] FIG. 13 is a flow diagram illustrating a method for a second device to perform sidelink communication according to one embodiment of the present disclosure.

[0128] The operations disclosed in the flow diagram of Fig. 13 may be performed in combination with various embodiments of the present disclosure. In one example, the operations disclosed in the flow diagram of Fig. 13 are performed based on at least one of the devices shown in Figs. 14 to 19. In one example, the second device of Fig. 13 corresponds to the second wireless device 200 of Fig. 15 described below, and the first device corresponds to the first wireless device 100 of Fig. 19. In another example, the second device of Fig. 13 corresponds to the first wireless device 100 of Fig. 15 described below, and the first device corresponds to the second wireless device 200 of Fig. 15.

[0129] In step S1310, the second device according to an embodiment may receive a PSCCH and a PSSCH associated with the PSCCH from the first device via an initial transmission resource of a transport block.

[0130] In step S1320, the second device according to one embodiment may transmit a PSFCH associated with the PSSCH to the first device based on whether the decoding of the PSSCH is successful or not.

[0131] In an embodiment, a sidelink grant relating to the initial transmission resources and retransmission resources of the transmission block is received from a base station by the first device.

[0132] In one embodiment, the first device compares a time interval between a PSFCH resource associated with the PSFCH and the retransmission resource with a minimum processing time required between reception of the PSFCH by the first device and a retransmission of the transmission block.

[0133] In one embodiment, the retransmission for the transmission block is dropped on the first retransmission resource by the first device based on the transmission block being a transmission block for which sidelink HARQ feedback is activated and the time interval is less than the minimum processing time.

[0134] In one embodiment, the transmission block with activated sidelink HARQ feedback is a transmission block to which a logical channel (LCH) with activated sidelink HARQ feedback is mapped.

[0135] In one embodiment, based on the time interval being smaller than the minimum processing time, the transmission blocks for which the sidelink HARQ feedback is activated are not transmitted to the second device and the transmission blocks for which the sidelink HARQ feedback is disabled are transmitted to the second device.

[0136] In one embodiment, based on the activation of Channel State Information (CSI) reporting, the symbol set for the PSSCH in a sidelink slot may not include an AGC symbol and a symbol for transmit-to-receive conversion.

[0137] In an embodiment, the symbol set for the PSSCH may include symbols other than the AGC symbol and the symbol for the transmit-receive conversion among the sidelink symbols included in the sidelink slot.

[0138] In one embodiment, the total number of symbols included in the symbol set for the PSSCH is the total number of sidelink symbols included in the sidelink slot minus two.

[0139] In one embodiment, the AGC symbol is the first symbol in time in the sidelink slot and the symbol for transmit to receive conversion is the last symbol in time in the sidelink slot.

[0140] In one embodiment, the total number of symbols included in the symbol set for the PSSCH is configured for a resource pool that triggered the CSI report.

[0141] According to an embodiment, the first device may transmit a PUCCH (Physical Uplink Control Channel) related to a sidelink HARQ feedback for the sidelink grant to the base station based on the PSFCH, and may receive a DCI (Downlink Control Information) including information on a second retransmission resource related to the sidelink grant from the base station.

[0142] In one embodiment, the cell for transmission of the PUCCH is determined based on the cell from which the DCI is expected to be received.

[0143] In one embodiment, the information on the second retransmission resource is included in a dynamic grant scrambled into a sidelink-configured scheduling-radio network temporary identifier (SL-CS-RNTI).

[0144] In one embodiment, the sidelink grant is received based on RRC signaling from the base station, and a type of the sidelink grant is a sidelink configured grant (CG) type 1.

[0145] According to an embodiment of the present disclosure, there is provided a second device for performing sidelink communication. The second device includes at least one memory for storing instructions, at least one transceiver, and at least one processor connecting the at least one memory and the at least one transceiver, and the at least one processor is configured to receive a transport block from the first device. and controls the at least one transceiver to receive a PSCCH and a PSSCH associated with the PSCCH via an initial transmission resource of a transmission block, and controls the at least one transceiver to transmit a PSFCH associated with the PSSCH to the first device based on whether decoding of the PSSCH is successful or not, wherein the first device receives a sidelink grant associated with the initial transmission resource and a retransmission resource of the transmission block from a base station, the first device compares a time interval between a PSFCH resource associated with the PSFCH and the retransmission resource with a minimum processing time required between reception of the PSFCH by the first device and retransmission of the transmission block, and drops retransmission of the transmission block on the first retransmission resource by the first device based on the transmission block being a transmission block for which sidelink HARQ feedback is activated and the time interval is less than the minimum processing time.

[0146] The various embodiments of the present disclosure may be intercombined.

[0147] Hereinafter, an apparatus to which various embodiments of the present disclosure can be applied will be described.

[0148] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or operational flow charts disclosed in this document may be applied to various fields requiring wireless communication / connection between devices (e.g., 5G).

[0149] The following description will be given in more detail with reference to the accompanying drawings. In the following drawings and descriptions, the same reference numerals may represent the same or corresponding hardware blocks, software blocks, or function blocks, unless otherwise stated.

[0150] FIG. 14 illustrates a communication system 1 according to an embodiment of the present disclosure.

[0151] Referring to FIG. 14, a communication system 1 to which various embodiments of the present disclosure are applied includes a wireless device, a base station, and a network. Here, the wireless device means a device that performs communication using a wireless connection technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)), and is called a communication / wireless / 5G device. Without being limited thereto, the wireless device may include a robot 100a, a vehicle 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a handheld device (Hand-held device) 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI device / server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing communication between vehicles, and the like. Here, the vehicle may include a UAV (Unmanned Aerial Vehicle) (e.g., a drone). The XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, and may be embodied in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, etc. The mobile devices may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, a smart glasses), a computer (e.g., a notebook, etc.), etc. The home appliances may include a TV, a refrigerator, a washing machine, etc. The IoT devices may include a sensor, a smart meter, etc. For example, a base station and a network may be embodied as a wireless device, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0152] Here, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low power communication. At this time, for example, NB-IoT technology is an example of LPWAN (Low Power Wide Area Network) 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-mentioned names. Furthermore, or generally, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may perform communication based on LTE-M technology. At this time, as an example, LTE-M technology is an example of LPWAN technology, and may be called by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above-mentioned names. In addition, or in general, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may include at least one of ZigBee (registered trademark), Bluetooth (registered trademark), and Low Power Wide Area Network (LPWAN), which consider low power communication, and is not limited to the above names. As an example, Zigbee technology can generate personal area networks (PANs) related to small / low power digital communication based on various standards such as IEEE 802.15.4, and is called by various names.

[0153] The wireless devices 100a to 100f may be connected to a network 300 via a base station 200. An AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to an 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. The wireless devices 100a to 100f may communicate with each other via the base station 200 / network 300, but may also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Furthermore, an IoT device (eg, a sensor) can directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

[0154] Wireless communications / connections 150a, 150b, and 150c may be established between the wireless devices 100a to 100f and the base station 200, and between the base stations 200 and 200. Here, the wireless communication / connections may be performed via various wireless connection technologies (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, IAB (Integrated Access Backhaul)). Through the wireless communication / connections 150a, 150b, and 150c, the wireless device and the base station / wireless device, and the base station and the base station may transmit / receive wireless signals to each other. For example, the wireless communication / connections 150a, 150b, and 150c may transmit / receive signals via various physical channels. To this end, based on various proposals of the present disclosure, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. may be performed.

[0155] FIG. 15 illustrates a wireless device according to one embodiment of the present disclosure.

[0156] 15, a first wireless device 100 and a second wireless device 200 can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, {first wireless device 100, second wireless device 200} may correspond to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG. 14.

[0157] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may be configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flow charts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate a first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver 106. The processor 102 may also receive a wireless signal including a second information / signal via the transceiver 106, and then store information obtained from signal processing of the second information / signal in the memory 104. The memory 104 may be coupled to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing some or all of the processes controlled by the processor 102 or implementing the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein. Here, the processor 102 and the memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 may be coupled to the processor 102 and may transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be mixed with an RF (Radio Frequency) unit. In this disclosure, a wireless device may also refer to a communication modem / circuit / chip.

[0158] The second wireless device 200 may include one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may be configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flow charts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate a third information / signal, and then transmit a wireless signal including the third information / signal via the transceiver 206. The processor 202 may also receive a wireless signal including a fourth information / signal via the transceiver 206, and then store information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 may be coupled to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing some or all of the processes controlled by the processor 202 or for implementing the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein. Here, the processor 202 and the memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver and may be mixed with an RF unit. In this disclosure, a wireless device may also refer to a communication modem / circuit / chip.

[0159] The hardware elements of the wireless devices 100, 200 are described in more detail below. Without being limited thereto, one or more protocol layers may be embodied by one or more processors 102, 202. For example, one or more processors 102, 202 may embody one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP, etc.). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 can generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information to the one or more transceivers 106, 206 according to the functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 can receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein.

[0160] The one or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein may be implemented using firmware or software configured to be executed by one or more processors 102, 202 or stored in one or more memories 104, 204 and run by one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein may be implemented using firmware or software in the form of code, instructions and / or collections of instructions.

[0161] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may comprise ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. Additionally, the one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0162] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or operational flow diagrams, etc., herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams, etc., disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 can be coupled to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208 and may be configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams, etc., disclosed herein via one or more antennas 108, 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, 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing the received user data, control information, radio signals / channels, etc., using one or more processors 102, 202. One or more transceivers 106, 206 may convert user data, control information, radio signals / channels, etc., processed using one or more processors 102, 202, from baseband signals to RF band signals. To this end, one or more transceivers 106, 206 may include an (analog) oscillator and / or a filter.

[0163] FIG. 16 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure.

[0164] Referring to FIG. 16, 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. Without being limited thereto, the operations / functions of FIG. 16 may be executed by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 15. The hardware elements of FIG. 16 may be embodied by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 15. For example, the blocks 1010 to 1060 may be embodied by the processors 102, 202 of FIG. 15. Also, the blocks 1010 to 1050 may be embodied by the processors 102, 202 of FIG. 15, and the block 1060 may be embodied by the transceivers 106, 206 of FIG. 15.

[0165] The codeword can be converted into a radio signal through the signal processing circuit 1000 of FIG. 16. Here, the codeword is an encoded bit sequence of an information block. The information block can include a transmission block (e.g., a transmission block of a UL-SCH, a transmission block of a DL-SCH). The radio signal can be transmitted through various physical channels (e.g., a PUSCH, a PDSCH).

[0166] Specifically, the codeword may be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence used for scrambling may be generated based on an initialization value, and the initialization value may include ID information of the wireless device, etc. The scrambled bit sequence may be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-BPSK (pi / 2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying), m-QAM (m-Quadrature Amplitude Modulation), etc. The complex modulation symbol sequence may be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbols of each transmission layer may be mapped to a corresponding antenna port(s) by the precoder 1040 (precoding). The output z of the precoder 1040 is obtained by multiplying the output y of the layer mapper 1030 by a precoding matrix W of N*M. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder 1040 may perform precoding after performing transform precoding (e.g., DFT transformation) on the complex modulation symbols. Also, the precoder 1040 may perform precoding without performing transform precoding.

[0167] The resource mapper 1050 can map the modulation symbols of each antenna port to a time-frequency resource. The time-frequency resource can include a plurality of symbols (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain. The signal generator 1060 generates a radio signal from the mapped modulation symbols, and the generated radio signal can be transmitted to other devices via each antenna. To this end, the signal generator 1060 can include an Inverse Fast Fourier Transform (IFFT) module, a Cyclic Prefix (CP) inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, and the like.

[0168] In the wireless device, the signal processing process for the received signal may be configured in reverse to the signal processing processes 1010 to 1060 of FIG. 16. For example, the wireless device (e.g., 100, 200 of FIG. 15) may receive a wireless signal from the outside through an antenna port / transmitter / receiver. The received wireless signal may be converted to a baseband signal through a signal restorer. For this purpose, 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. Thereafter, the baseband signal may be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword may be restored to the original information block through decoding. Therefore, a signal processing circuit (not shown) for the received signal may include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0169] 17 illustrates a wireless device according to an embodiment of the present disclosure. The wireless device may be embodied in various forms depending on the use case / service (see FIG. 14).

[0170] 17, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 15 and may be configured with various elements, components, units, and / or modules. For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit may include a communication circuit 112 and a transceiver(s) 114. For example, the communication circuit 112 may include one or more processors 102, 202 and / or one or more memories 104, 204 of FIG. 15. For example, the transceiver(s) 114 may include one or more transceivers 106, 206 and / or one or more antennas 108, 208 of FIG. 15. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls the overall operation of the wireless device. For example, the control unit 120 can control electrical / mechanical operations of the wireless device based on the programs / codes / instructions / information stored in the memory unit 130. In addition, the control unit 120 can transmit information stored in the memory unit 130 to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit 110, or store information received from an external device (e.g., another communication device) via a wireless / wired interface through the communication unit 110 in the memory unit 130.

[0171] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Without being limited thereto, the wireless device may be embodied in the form of a robot (100a in FIG. 14), a vehicle (100b-1, 100b-2 in FIG. 14), an XR device (100c in FIG. 14), a mobile device (100d in FIG. 14), a home appliance (100e in FIG. 14), an IoT device (100f in FIG. 14), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a Fintech device (or a financial device), a security device, a climate / environment device, an AI server / device (400 in FIG. 14), a base station (200 in FIG. 14), a network node, or the like. The wireless device may be mobile or fixed depending on the use case / service.

[0172] In FIG. 17, various elements, components, units / parts, and / or modules in the wireless devices 100 and 200 may be interconnected entirely through a wired interface, or at least some of them may be wirelessly connected through the communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired and the control unit 120 and a first unit (e.g., 130, 140) may be wirelessly connected through the communication unit 110. Also, each element, component, unit / part, and / or module in the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured as a set of one or more processors. For example, the control unit 120 may be configured as a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 may be composed of a Random Access Memory (RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0173] The embodiment of FIG. 17 will now be described in more detail with reference to other drawings.

[0174] 18 illustrates a mobile device according to an embodiment of the present disclosure. The mobile device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, a smart glasses), or a portable computer (e.g., a notebook, etc.). The mobile device may be called 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).

[0175] 18, the portable 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 input / output 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 blocks 110 to 130 / 140 in FIG. 17, respectively.

[0176] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from other wireless devices and base stations. The control unit 120 can control components of the portable device 100 and perform various operations. The control unit 120 can include an AP (Application Processor). The memory unit 130 can store data / parameters / programs / codes / commands required for operating the portable device 100. The memory unit 130 can also store input / output data / information, etc. The power supply unit 140a supplies power to the portable device 100 and can include a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support connection between the portable device 100 and other external devices. The interface unit 140b can include various ports (e.g., audio input / output ports, video input / output ports) for connection with external devices. The input / output unit 140c can receive or output video information / signals, audio information / signals, data, and / or information input by a user. The input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0177] For example, in the case of data communication, the input / output unit 140c may acquire information / signals (e.g., touch, text, voice, image, video) input by a user, and the acquired information / signals may be stored in the memory unit 130. The communication unit 110 may convert the information / signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to another wireless device or to a base station. In addition, the communication unit 110 may receive wireless signals from another wireless device or a base station, and then restore the received wireless signals to the original information / signals. The restored information / signals may be stored in the memory unit 130 and then output in various forms (e.g., text, voice, image, video, haptic) via the input / output unit 140c.

[0178] 19 illustrates a vehicle or an autonomous vehicle according to an embodiment of the present disclosure. The vehicle or the autonomous vehicle may be embodied as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, or the like.

[0179] 19, a vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 17, respectively.

[0180] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit 120 can control elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 can include an ECU (Electronic Control Unit). The driving unit 140a can cause the vehicle or autonomous vehicle 100 to run on the ground. The driving unit 140a can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and can include wired / wireless charging circuits, batteries, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a forward / reverse sensor of the vehicle, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane while driving, a technology for automatically adjusting speed like adaptive cruise control, a technology for automatically driving along a predetermined route, a technology for automatically setting a route and driving when a destination is set, etc.

[0181] 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 route and a driving plan based on the acquired data. The control unit 120 may control the driving unit 140a so that the vehicle or the autonomous driving vehicle 100 moves along the autonomous driving route according to the driving plan (e.g., speed / direction adjustment). During the autonomous driving, the communication unit 110 may non-periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from surrounding vehicles. Also, during the autonomous driving, the sensor unit 140c may acquire vehicle status and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly acquired data / information. The communication unit 110 may transmit information on the vehicle position, the autonomous driving route, the driving plan, etc. to an external server. The external server may predict traffic information data in advance using AI technology, etc. based on information collected from the vehicle or the autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or the autonomous driving vehicle.

[0182] The claims described in this specification may be combined in various ways. For example, the technical features of the method claims of this specification may be combined and embodied in an apparatus, and the technical features of the device claims of this specification may be combined and embodied in a method. Furthermore, the technical features of the method claims and the technical features of the device claims of this specification may be combined and embodied in an apparatus, and the technical features of the method claims and the technical features of the device claims of this specification may be combined and embodied in a method.

Claims

1. 1. A method for a first device conducting sidelink communication, comprising: receiving, from a base station, a sidelink grant relating to initial transmission resources and first retransmission resources of a transport block; Transmitting a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH) related to the PSCCH to a second device according to the initial transmission resource; determining a PSFCH resource for receiving a Physical Sidelink Feedback Channel (PSFCH) from the second device based on a slot index and a subchannel index associated with the PSSCH; receiving, from the second device, the PSFCH related to the PSSCH based on the PSFCH resources; comparing a time interval between the PSFCH resource and the first retransmission resource to a minimum processing time required between reception of the PSFCH and retransmission of the transmission block; performing sidelink communication with the second device based on a comparison of the time interval and the minimum processing time; the transmission block is a transmission block for which sidelink Hybrid Automatic Repeat Request (HARQ) feedback is enabled, and retransmission of the transmission block is dropped on the first retransmission resource by the first device based on the time interval being less than the minimum processing time.

2. The method according to claim 1 , wherein the transmission block for which the sidelink HARQ feedback is activated is a transmission block to which a logical channel (LCH) for which the sidelink HARQ feedback is activated is mapped.

3. 2. The method of claim 1, wherein the transmission blocks with sidelink HARQ feedback activated are not transmitted to the second device and the transmission blocks with sidelink HARQ feedback disabled are transmitted to the second device based on the time interval being smaller than the minimum processing time.

4. 2. The method of claim 1, wherein based on an activated Channel State Information (CSI) reporting, the symbol set for the PSSCH in a sidelink slot does not include an AGC symbol and a symbol for transmit-receive conversion.

5. The method of claim 4, wherein the symbol set for the PSSCH includes symbols excluding the AGC symbol and the symbol for the transmit-receive conversion from among sidelink symbols included in the sidelink slot.

6. 6. The method of claim 5, wherein the total number of symbols included in the symbol set for the PSSCH is a value obtained by subtracting 2 from the total number of sidelink symbols included in the sidelink slot.

7. the AGC symbol is a first symbol in time within the sidelink slot, 5. The method of claim 4, wherein the symbol for transmit-to-receive conversion is the last symbol in time in the sidelink slot.

8. The method of claim 4, wherein a total number of symbols included in the symbol set for the PSSCH is configured for a resource pool that triggered the CSI report.

9. transmitting a Physical Uplink Control Channel (PUCCH) related to the sidelink HARQ feedback for the sidelink grant based on the PSFCH to the base station; receiving, from the base station, a Downlink Control Information (DCI) including information on a second retransmission resource associated with the sidelink grant; The method of claim 1, wherein a cell for transmitting the PUCCH is determined based on a cell from which the DCI is expected to be received.

10. 10. The method of claim 9, wherein the information about the second retransmission resource is included in a dynamic grant scrambled with a sidelink-configured scheduling-radio network temporary identifier (SL-CS-RNTI).

11. the sidelink grant is received based on RRC signaling from the base station; 2. The method of claim 1, wherein a type of the sidelink grant is a sidelink configured grant (CG) type 1.

12. In a first device performing sidelink communication, at least one memory for storing instructions; at least one transceiver; at least one processor coupled to the at least one memory and the at least one transceiver; The at least one processor controlling the at least one transceiver to receive, from a base station, a sidelink grant relating to an initial transmission resource and a first retransmission resource of a transport block; Controlling the at least one transceiver to transmit a Physical Sidelink Control Channel (PSCCH) and a Physical Sidelink Shared Channel (PSSCH) related to the PSCCH based on the initial transmission resource to a second device; determining a PSFCH resource for receiving a PSFCH (Physical Sidelink Feedback Channel) from the second device based on a slot index and a subchannel index associated with the PSSCH; controlling the at least one transceiver to receive, from the second device, the PSFCH for the PSSCH based on the PSFCH resources; Comparing a time interval between the PSFCH resource and the first retransmission resource to a minimum processing time required between reception of the PSFCH and retransmission of the transmission block; controlling the at least one transceiver to conduct sidelink communications with the second device based on a comparison of the time interval and the minimum processing time; the transmission block is a transmission block for which sidelink Hybrid Automatic Repeat Request (HARQ) feedback is enabled, and retransmission of the transmission block is dropped on the first retransmission resource by the first device based on the time interval being less than the minimum processing time.

13. In an apparatus for controlling a first terminal, the apparatus comprises: at least one processor; at least one memory coupled to store instructions for execution by the at least one processor; Execution of the instructions by the at least one processor causes the first terminal to: receiving, from a base station, a sidelink grant relating to an initial transmission resource and a first retransmission resource of a transport block; Transmitting a PSCCH (Physical Sidelink Control Channel) and a PSSCH (Physical Sidelink Shared Channel) related to the PSCCH to a second device based on the initial transmission resource; determining a PSFCH resource for receiving a PSFCH (Physical Sidelink Feedback Channel) from the second device based on a slot index and a subchannel index associated with the PSSCH; receiving, from the second device, the PSFCH for the PSSCH based on the PSFCH resource; Comparing a time interval between the PSFCH resource and the first retransmission resource to a minimum processing time required between reception of the PSFCH and retransmission of the transmission block; performing sidelink communication with the second device based on a comparison of the time interval and the minimum processing time; the transmission block is a transmission block for which sidelink Hybrid Automatic Repeat Request (HARQ) feedback is enabled, and retransmission of the transmission block is dropped on the first retransmission resource by the first terminal based on the time interval being less than the minimum processing time.

14. A non-transitory computer-readable storage medium storing instructions that, when executed, cause a first device to: receiving, from a base station, a sidelink grant relating to an initial transmission resource and a first retransmission resource of a transport block; A second device transmits a PSCCH (Physical Sidelink Control Channel) and a PSSCH (Physical Sidelink Shared Channel) related to the PSCCH based on the initial transmission resource; determining a PSFCH resource for receiving a PSFCH (Physical Sidelink Feedback Channel) from the second device based on a slot index and a subchannel index associated with the PSSCH; receiving, from the second device, the PSFCH related to the PSSCH based on the PSFCH resource; comparing a time interval between the PSFCH resource and the first retransmission resource with a minimum processing time required between reception of the PSFCH and retransmission of the transmission block; performing sidelink communication with the second device based on a comparison of the time interval and the minimum processing time; the transmission block is a transmission block for which sidelink Hybrid Automatic Repeat Request (HARQ) feedback is enabled, and a retransmission of the transmission block is dropped on the first retransmission resource by the first device based on the time interval being less than the minimum processing time.

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