SL mode 1 operation method and device considering SL DRX active time of receiving terminal in NR V2X

Abstract

A method for operating a first device 100 in a wireless communication system is proposed. The method may include receiving information related to at least one first SL resource, including an initial transmission resource and at least one retransmission resource, from a base station 300, and transmitting a HARQ NACK to the base station 300 based on the at least one retransmission resource not being included in the SL DRX active time of the second device 200.

Description

[Technical Field]

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

[0002] Sidelink (SL) is a communication method that establishes a direct link between terminals (User Equipment, UE) and directly exchanges voice or data between terminals without going through a base station (BS). SL is being considered as a solution to alleviate the burden on base stations due to the rapidly increasing data traffic. V2X (vehicle-to-everything) is a communication technology that exchanges information with other vehicles, pedestrians, infrastructure-based objects, etc. via wired or wireless communication. V2X can be divided into four types: V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X communication can be provided via the PC5 interface and / or Uu interface.

[0003] Meanwhile, as more communication devices require larger communication capacities, there is an emerging need for improved mobile broadband communication compared to existing radio access technologies (RATs). Accordingly, 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. Summary of the Invention [Means for solving the problem]

[0004] According to one embodiment of the present disclosure, a method for a first device to perform wireless communication is provided. For example, the method may include the steps of receiving information related to at least one first sidelink (SL) resource from a base station, the information including an initial transmission resource and at least one retransmission resource; acquiring an SL discontinuous reception (DRX) configuration of a second device, the SL DRX configuration including at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer including at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and at least one of a running time of the SL DRX on-duration timer, a running time of the SL DRX inactivity timer, or a running time of the SL DRX retransmission timer is included in an SL DRX active time of the second device; and acquiring an SL discontinuous reception (DRX) configuration of a second device, the SL DRX configuration including at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer including at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and The method may include transmitting a hybrid automatic repeat request (HARQ) negative acknowledge (NACK) to the base station based on the fact that the at least one retransmission resource is not included in the DRX active time.

[0005] According to one embodiment of the present disclosure, there is provided a first device for wireless communication, wherein the first device may include one or more memories for storing instructions, one or more transceivers, and one or more processors coupling the one or more memories and the one or more transceivers. For example, the one or more processors execute the instructions to receive information related to at least one first sidelink (SL) resource, including an initial transmission resource and at least one retransmission resource, from a base station, and acquire SL discontinuous reception (DRX) configuration of a second device, wherein the SL DRX configuration includes at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer includes at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and at least one of a running time of the SL DRX on-duration timer, a running time of the SL DRX inactivity timer, or a running time of the SL DRX retransmission timer is included in the SL DRX active time of the second device, and Based on the fact that the at least one retransmission resource is not included in the DRX active time, a hybrid automatic repeat request (HARQ) negative acknowledge (NACK) may be sent to the base station.

[0006] According to one embodiment of the present disclosure, there is provided an apparatus configured to control a first terminal, wherein the apparatus may include, for example, one or more processors and one or more memories coupled to and storing instructions for execution by the one or more processors. For example, the one or more processors execute the instructions to receive information related to at least one first sidelink (SL) resource, including an initial transmission resource and at least one retransmission resource, from a base station and acquire SL discontinuous reception (DRX) configuration of a second terminal, wherein the SL DRX configuration includes at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer includes at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and at least one of a running time of the SL DRX on-duration timer, a running time of the SL DRX inactivity timer, or a running time of the SL DRX retransmission timer is included in the SL DRX active time of the second terminal, and the SL Based on the fact that the at least one retransmission resource is not included in the DRX active time, a hybrid automatic repeat request (HARQ) negative acknowledge (NACK) may be sent to the base station.

[0007] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having instructions recorded thereon is provided. For example, when executed, the instructions cause a first device to receive information related to at least one first sidelink (SL) resource, including an initial transmission resource and at least one retransmission resource, from a base station, and to acquire an SL discontinuous reception (DRX) configuration of a second device, wherein the SL DRX configuration includes at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer includes at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and at least one of a running time of the SL DRX on-duration timer, a running time of the SL DRX inactivity timer, or a running time of the SL DRX retransmission timer is included in an SL DRX active time of the second device, and When the at least one retransmission resource is not included in the DRX active time, a hybrid automatic repeat request (HARQ) negative acknowledge (NACK) may be transmitted to the base station.

[0008] According to an embodiment of the present disclosure, there is provided a method for a second device to perform wireless communication. For example, the method includes acquiring a sidelink (SL) discontinuous reception (DRX) configuration, receiving sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) from a first device via a physical sidelink control channel (PSCCH) based on at least one second SL resource, and receiving a medium access control (MAC) protocol data unit (PDU) from the first device via the PSSCH based on the at least one second SL resource, wherein the at least one second SL resource reallocated by a base station based on a hybrid automatic repeat request (HARQ) negative acknowledge (NACK) is included in the SL DRX active time, and the HARQ NACK can be transmitted from the first device to the base station based on at least one retransmission resource included in the at least one first SL resource not being included in the SL DRX active time.

[0009] According to one embodiment of the present disclosure, there is provided a second device for wireless communication, wherein the second device may include one or more memories for storing instructions, one or more transceivers, and one or more processors connecting the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to acquire a sidelink (SL) discontinuous reception (DRX) configuration, receive sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) from a first device via a physical sidelink control channel (PSCCH) based on at least one second SL resource, and receive a medium access control (MAC) protocol data unit (PDU) from the first device via the PSSCH based on the at least one second SL resource, but based on a hybrid automatic repeat request (HARQ) negative acknowledge (NACK), the at least one second SL resource reallocated by a base station from at least one first SL resource is included in the SL DRX active time, and the HARQ NACK may be transmitted from the first device to a base station based on at least one retransmission resource included in the at least one first SL resource not being included in the SL DRX active time. [Effects of the Invention]

[0010] The terminal can efficiently carry out SL communication. [Brief explanation of the drawings]

[0011] [Figure 1] 1 illustrates the structure of an NR system according to one embodiment of the present disclosure.

[0012] [Figure 2]1 illustrates a radio protocol architecture according to one embodiment of the present disclosure.

[0013] [Figure 3] 1 illustrates a structure of an NR radio frame according to one embodiment of the present disclosure.

[0014] [Figure 4] 1 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure.

[0015] [Figure 5] 1 illustrates an example of a BWP according to an embodiment of the present disclosure.

[0016] [Figure 6] According to one embodiment of the present disclosure, a procedure for a terminal to perform V2X or SL communication depending on a transmission mode is shown.

[0017] [Figure 7] 1 illustrates three cast types according to one embodiment of the present disclosure.

[0018] [Figure 8] 1 illustrates an embodiment in which an SL grant partially overlaps with the SL DRX active time of a receiving terminal, according to an embodiment of the present disclosure.

[0019] [Figure 9] 10 illustrates an embodiment in which the SL grant partially overlaps with the SL DRX active time of the receiving terminal according to an embodiment of the present disclosure.

[0020] [Figure 10] 10 illustrates a procedure in which a transmitting terminal transmits NACK information when an SL grant partially overlaps with an SL DRX active time of a receiving terminal according to an embodiment of the present disclosure.

[0021] [Figure 11] 1 illustrates a procedure for a first device to perform wireless communication according to one embodiment of the present disclosure.

[0022] [Figure 12] 10 illustrates a procedure for a second device to perform wireless communication according to one embodiment of the present disclosure.

[0023] [Figure 13] 1 illustrates a communication system 1 according to one embodiment of the present disclosure.

[0024] [Figure 14] 1 illustrates a wireless device according to one embodiment of the present disclosure.

[0025] [Figure 15] 1 illustrates a signal processing circuit for a transmit signal according to one embodiment of the present disclosure.

[0026] [Figure 16] 1 illustrates a wireless device according to one embodiment of the present disclosure.

[0027] [Figure 17] 1 illustrates a mobile device according to one embodiment of the present disclosure.

[0028] [Figure 18] 1 illustrates a vehicle or autonomous vehicle according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0029] As used herein, "A or B" can mean "only A," "only B," or "both A and B." Also, as used herein, "A or B" can be interpreted as "A and / or B." For example, as used herein, "A, B, or C" can mean "only A," "only B," "only C," or "any combination of A, B, and C."

[0030] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Therefore, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0031] As used herein, "at least one of A and B" can mean "only A," "only B," or "both A and B." Additionally, as used herein, 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."

[0032] Furthermore, 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." Furthermore, "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."

[0033] Furthermore, parentheses used herein may mean "for example." Specifically, when "control information (PDCCH)" is used, "PDCCH" is proposed as an example of "control information." Furthermore, "control information" in this specification is not limited to "PDCCH," and "PDCCH" is proposed as an example of "control information." Furthermore, when "control information (i.e., PDCCH)" is used, "PDCCH" is proposed as an example of "control information."

[0034] In the following description, "when, if, in case of" may be replaced with "based on."

[0035] In this specification, technical features individually described in one drawing may be embodied individually or simultaneously.

[0036] In this specification, a higher layer parameter may be a parameter that is configured for a terminal, configured in advance, or predefined. For example, a base station or a network may transmit the higher layer parameter to the terminal. For example, the higher layer parameter may be transmitted via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0037] 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), and single carrier frequency division multiple access (SC-FDMA). 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), and 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 evolved UTRA (E-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 (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.

[0038] 5G NR is a successor technology to LTE-A and is a new clean-slate 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 between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz.

[0039] For clarity of explanation, the description will be centered on 5G NR, but the technical idea according to an embodiment of the present disclosure is not limited thereto.

[0040] For terms and technologies used in this specification that are not specifically explained, reference may be made to wireless communication standard documents published before the filing of this specification.

[0041] 1 illustrates the structure of an NR system according to one embodiment of the present disclosure. The embodiment of FIG. 1 can be combined with various embodiments of the present disclosure.

[0042] Referring to FIG. 1 , a Next Generation Radio Access Network (NG-RAN) may include a base station 20 that provides user plane and control plane protocol termination for a terminal 10. For example, the base station 20 may include a next generation NodeB (gNB) and / or an evolved NodeB (eNB). For example, the terminal 10 may be fixed or mobile, and may be referred to as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, or other terms. For example, a base station is a fixed station that communicates with the terminal 10, and may be referred to as a base transceiver system (BTS), an access point, or other terms.

[0043] The embodiment of Figure 1 illustrates a case where only gNBs are included. Base stations 20 may be connected to each other via an Xn interface. Base stations 20 may be connected to a 5G Core Network (5GC) via an NG interface. More specifically, base stations 20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface and to a user plane function (UPF) 30 via an NG-U interface.

[0044] The radio interface protocol layers between a terminal and a network can be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based on the bottom three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. Among these, the physical layer, which belongs to Layer 1, provides an information transfer service using a physical channel, and the Radio Resource Control (RRC) layer, which is located in Layer 3, controls radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

[0045] Figure 2 illustrates a radio protocol architecture according to one embodiment of the present disclosure. The embodiment of Figure 2 can be combined with various embodiments of the present disclosure. Specifically, Figure 2(a) illustrates a user plane radio protocol stack for Uu communication, and Figure 2(b) illustrates a control plane radio protocol stack for Uu communication. Figure 2(c) illustrates a user plane radio protocol stack for SL communication, and Figure 2(d) illustrates a control plane radio protocol stack for SL communication.

[0046] Referring to Figure 2, the physical layer provides information transfer services to higher layers using physical channels. The physical layer is connected to the 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.

[0047] Data is transferred between different physical layers, i.e., between the physical layers of a transmitter and a receiver, via a physical channel, which can be modulated using Orthogonal Frequency Division Multiplexing (OFDM) and utilizes time and frequency as radio resources.

[0048] 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.

[0049] The RLC layer performs concatenation, segmentation, and reassembly of RLC Service Data Units (SDUs). To guarantee various Quality of Service (QoS) requirements for 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).

[0050] The Radio Resource Control (RRC) 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, reconfiguration, 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.

[0051] The functions of the PDCP layer in the user plane include user data transmission, header compression, and ciphering, and the functions of the PDCP layer in the control plane include control plane data transmission and encryption / integrity protection.

[0052] 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.

[0053] RB configuration refers to the process of defining the characteristics of the radio protocol layer and channel to provide a specific service and setting their specific parameters and operation methods. RBs are 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.

[0054] 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 the connection with the base station.

[0055] Downlink transport channels for transmitting data from a network to a terminal include a Broadcast Channel (BCH) for transmitting system information and a Downlink Shared Channel (SCH) for transmitting user traffic and control messages. Traffic or control messages of a downlink multicast or broadcast service 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 an Uplink Shared Channel (SCH) for transmitting user traffic and control messages.

[0056] Above the transport channels, logical channels that are mapped to the transport channels include BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), and MTCH (Multicast Traffic Channel).

[0057] 3 illustrates a radio frame structure for NR according to one embodiment of the present disclosure. The embodiment of FIG. 3 can be combined with various embodiments of the present disclosure.

[0058] Referring to Figure 3, 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 the subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP).

[0059] When a normal CP is used, each slot can contain 14 symbols. When an extended CP is used, each slot can contain 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols) or Single Carrier-FDMA (SC-FDMA) symbols (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbols).

[0060] Table 1 below shows the number of symbols per slot (N) depending on the SCS setting (u) when normal CP is used. slot symb ), number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot ) is shown below.

[0061] [Table 1]

[0062] 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.

[0063] [Table 2]

[0064] In an NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) can be set to be different between multiple cells merged into one terminal, thereby allowing 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 to be set to be different between the merged cells.

[0065] In NR, multiple numerologies or SCSs can be supported to support various 5G services. For example, if the SCS is 15 kHz, wide areas in traditional cellular bands can be supported, and if the SCS is 30 kHz / 60 kHz, dense-urban areas, lower latency, and wider carrier bandwidths can be supported. If the SCS is 60 kHz or higher, bandwidths greater than 24.25 GHz can be supported to overcome phase noise.

[0066] The NR frequency band can be defined as two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The values ​​of the frequency ranges can be changed. For example, the two types of frequency ranges are shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean the "sub 6 GHz range" and FR2 can mean the "above 6 GHz range" and can be called millimeter wave (mmW).

[0067] [Table 3]

[0068] As mentioned above, the numerical values ​​of the frequency range of the NR system may be changed. For example, FR1 may include the band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 may include frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included in FR1 may include unlicensed bands. Unlicensed bands may be used for various purposes, such as communications for vehicles (e.g., autonomous driving).

[0069] [Table 4]

[0070] 4 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. The embodiment of FIG. 4 can be combined with various embodiments of the present disclosure.

[0071] 4, a slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot may include 14 symbols, and in the case of an extended CP, one slot may include 12 symbols. Alternatively, in the case of a normal CP, one slot may include 7 symbols, and in the case of an extended CP, one slot may include 6 symbols.

[0072] A carrier includes multiple subcarriers in the frequency domain. A Resource Block (RB) can be defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) can be defined as multiple (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 activated BWPs. Each element is called a Resource Element (RE) in the resource grid, and one complex symbol can be mapped to it.

[0073] The following explains BWP (Bandwidth Part) and carriers.

[0074] A Bandwidth Part (BWP) is a contiguous set of physical resource blocks (PRBs) in a given numerology. PRBs can be selected from a contiguous subset of common resource blocks (CRBs) for a given numerology on a given carrier.

[0075] For example, the BWP may be at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor downlink radio link quality in DL BWPs other than the active DL BWP on the primary cell (PCell). For example, the UE may not receive a PDCCH, a physical downlink shared channel (PDSCH), or a CSI-RS (reference signal) (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a CSI (Channel State Information) report for an inactive DL BWP. For example, the UE may not transmit a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel) outside the active UL BWP. For example, in the downlink, the initial BWP is given as a contiguous RB set for the remaining minimum system information (RMSI) control resource set (CORESET) (set by the physical broadcast channel (PBCH)). For example, in the uplink, the initial BWP is provided by a system information block (SIB) for the 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. 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.

[0076] 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 the SL BWP from a base station / network. For example, a terminal can receive a configuration for the Uu BWP from a base station / network. An SL BWP can be configured (pre-configured) for out-of-coverage NR V2X terminals and RRC_IDLE terminals within a carrier. For a terminal in RRC_CONNECTED mode, at least one SL BWP can be activated within the carrier.

[0077] 5 illustrates an example of a BWP according to an embodiment of the present disclosure. The embodiment of FIG. 5 can be combined with various embodiments of the present disclosure. In the embodiment of FIG. 5, it is assumed that there are three BWPs.

[0078] Referring to Figure 5, CRBs (common resource blocks) are carrier resource blocks numbered from one end of a carrier band to the other end, and PRBs are resource blocks numbered within each BWP. Point A can indicate a common reference point for the resource block grid.

[0079] 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.

[0080] The following describes V2X or SL communication.

[0081] The Sidelink Synchronization Signal (SLSS) is a SL-specific sequence and may include a Primary Sidelink Synchronization Signal (PSSS) and a Secondary Sidelink Synchronization Signal (SSSS). The PSSS may be referred to as a Sidelink Primary Synchronization Signal (S-PSS), and the SSSS may be referred to as a Sidelink Secondary Synchronization Signal (S-SSS). For example, 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, a terminal may perform initial signal detection and acquire synchronization using the S-PSS. For example, a terminal may acquire detailed synchronization and detect a synchronization signal ID using the S-PSS and S-SSS.

[0082] The PSBCH (Physical Sidelink Broadcast Channel) is a (broadcast) channel that transmits basic (system) information that a terminal must know first before transmitting or 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, type of application related to SLSS, subframe offset, broadcast information, etc. For example, for evaluating PSBCH performance, in NR V2X, the size of the PSBCH payload is 56 bits, including a 24-bit CRC (Cyclic Redundancy Check).

[0083] The S-PSS, S-SSS, and PSBCH can be included in a block format (e.g., an S-SS (Synchronization Signal) / PSBCH block, hereinafter referred to as an 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 the PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) in a carrier, and the transmission bandwidth is within a (pre-) configured S-BWP (Sidelink Bandwidth Part). For example, the bandwidth of the S-SSB is 11 RBs (Resource Blocks). For example, the PSBCH spans 11 RBs. 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.

[0084] 6 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. 6 can 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 description, 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.

[0085] For example, (a) of Figure 6 illustrates terminal operation associated with LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, (a) of Figure 6 illustrates 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.

[0086] For example, (b) of FIG. 6 illustrates terminal operation associated with LTE transmission mode 2 or LTE transmission mode 4. Or, for example, (b) of FIG. 6 illustrates terminal operation associated with NR resource allocation mode 2.

[0087] Referring to (a) of Figure 6, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, a base station can schedule SL resources to be used by a terminal for SL transmission. For example, in step S600, the base station can transmit information related to SL resources and / or information related to UL resources to a first terminal. For example, the UL resources can include PUCCH resources and / or PUSCH resources. For example, the UL resources can be resources for reporting SL HARQ feedback to the base station.

[0088] For example, the first terminal may receive information related to dynamic grant (DG) resources and / or information related to configured grant (CG) resources from the base station. For example, the CG resources may include CG type 1 resources or CG type 2 resources. In this specification, the DG resources may be resources configured / assigned to the first terminal by the base station via downlink control information (DCI). In this specification, the CG resources may be (periodic) resources configured / assigned to the first terminal by the base station via DCI and / or an RRC message. For example, in the case of CG type 1 resources, the base station may send an RRC message including information related to the CG resources to the first terminal. For example, in the case of CG type 2 resources, the base station may send an RRC message including information related to the CG resources to the first terminal, and the base station may send a DCI related to the activation or release of the CG resources to the first terminal.

[0089] In step S610, the first terminal may transmit a PSCCH (e.g., Sidelink Control Information (SCI) or 1st-stage SCI) to a second terminal based on the resource scheduling. In step S620, the first terminal may transmit a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) associated with the PSCCH to a second terminal. In step S630, the first terminal may receive a PSFCH associated with the PSCCH / PSSCH from a second terminal. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second terminal via the PSFCH. In step S640, the first terminal may transmit / report HARQ feedback information to a base station via a PUCCH or a PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first terminal based on the HARQ feedback information received from the second terminal. For example, the HARQ feedback information reported to the base station may be information generated by the first terminal based on a preset rule. For example, the DCI may be DCI for SL scheduling. For example, the format of the DCI may be DCI format 3_0 or DCI format 3_1.

[0090] An example of DCI format 3_0 will be described below.

[0091] DCI format 3_0 is used for scheduling NR PSCCH and NR PSSCH in one cell.

[0092] The following information is transmitted via DCI format 3_0 with CRC scrambled by SL-RNTI or SL-CS-RNTI:

[0093] Resource Pool Index - ceiling(log2I) bits, where I is the number of resource pools for transmission configured by the higher layer parameter sl-TxPoolScheduling.

[0094] - Time gap - 3 bits determined by the higher layer parameter sl-DCI-ToSL-Trans

[0095] - HARQ process number - 4 bits

[0096] -New Data Indicator - 1 bit

[0097] - the lowest index of the subchannel allocation for the initial transmission - ceiling(log2(N SL subChannel ))bit

[0098] -SCI format 1-A field: frequency resource allocation, time resource allocation

[0099] -PSFCH-to-HARQ feedback timing indicator -ceiling(log2N fb_timing ) bits, where N fb_timing is the number of entries in the higher layer parameter sl-PSFCH-ToPUCCH.

[0100] -PUCCH resource indicator - 3 bits

[0101] -Configuration index - 0 bit if the UE is not configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI; otherwise, 3 bits. If the UE is configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI, this field is reserved for DCI format 3_0 with CRC scrambled by SL-RNTI.

[0102] Counter sidelink allocation index - 2 bits, 2 bits if the UE is configured with pdsch-HARQ-ACK-Codebook=dynamic, 2 bits if the UE is configured with pdsch-HARQ-ACK-Codebook=semi-static

[0103] -Padding bits, if needed

[0104] Referring to (b) of FIG. 6, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal can determine SL transmission resources within SL resources configured by the base station / network or pre-configured SL resources. For example, the configured SL resources or pre-configured SL resources may be a resource pool. For example, the terminal can autonomously select or schedule resources for SL transmission. For example, the terminal can self-select resources within a configured resource pool to perform SL communication. For example, the terminal can perform sensing and resource (re)selection procedures and self-select resources within a selection window. For example, the sensing can be performed in units of subchannels. For example, in step S610, the first terminal that self-selected resources within the resource pool may use the resources to transmit PSCCH (e.g., SCI (Sidelink Control Information) or 1 stIn step S620, the first terminal transmits a PSSCH (e.g., a 2-stage SCI) associated with the PSCCH to the second terminal. nd In step S630, the first terminal may receive a PSFCH associated with the PSCCH / PSSCH from the second terminal.

[0105] Referring to (a) or (b) of FIG. 6, for example, the first terminal can transmit an SCI to the second terminal on the PSCCH. Alternatively, for example, the first terminal can transmit two consecutive SCIs (e.g., 2-stage SCIs) to the second terminal on the PSCCH and / or PSSCH. In this case, the second terminal can decode the two consecutive SCIs (e.g., 2-stage SCIs) to receive the PSSCH from the first terminal. In this specification, the SCI transmitted on the PSCCH is referred to as a 1 st SCI, 1st SCI, 1 st -stage SCI or 1 st The SCI transmitted on the PSSCH can be referred to as a 2-stage SCI format. nd SCI, 2nd SCI, 2 nd -stage SCI or 2 nd -stage SCI format. For example, st -stage SCI formats can include SCI format 1-A, 2 nd -stage SCI formats may include SCI format 2-A and / or SCI format 2-B.

[0106] An example of SCI format 1-A will be described below.

[0107] SCI format 1-A is PSSCH and 2 on PSSCH nd -stage Used for scheduling SCI.

[0108] The following information is transmitted using SCI Format 1-A.

[0109] - Priority - 3 bits

[0110] - Frequency resource allocation - If the value of the upper layer parameter sl-MaxNumPerReserve is set to 2, then ceiling(log2(N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, if the value of the upper layer parameter sl-MaxNumPerReserve is set to 3, then ceilinglog2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits

[0111] - Time resource allocation - 5 bits if the value of the upper layer parameter sl-MaxNumPerReserve is set to 2; otherwise, 9 bits if the value of the upper layer parameter sl-MaxNumPerReserve is set to 3

[0112] -Resource reservation period-ceiling(log2N rsv_period ) bits, where N rsv_period is the number of entries in the upper layer parameter sl-ResourceReservePeriodList if the upper layer parameter sl-MultiReserveResource is set; otherwise, a 0 bit

[0113] -DMRS pattern -ceiling(log2N pattern ) bits, where N pattern is the number of DMRS patterns configured by the higher layer parameter sl-PSSCH-DMRS-TimePatternList

[0114] -2 nd -stageSCI format - 2 bits as defined in Table 5

[0115] - Better_OffsetsIndicator - 2 bits as provided by the upper layer parameter sl-BetaOffsets2ndSCI

[0116] Number of DMRS ports - 1 bit as defined in Table 6

[0117] -Modulation and coding method - 5 bits

[0118] - Additional MCS table indicator - 1 bit if one MCS table is set by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are set by the higher layer parameter sl-Additional-MCS-Table; 0 bit otherwise

[0119] PSFCH overhead indicator - 1 bit if higher layer parameter sl-PSFCH-Period=2 or 4; 0 bit otherwise

[0120] Reserved Bits - The number of bits determined by the higher layer parameter sl-NumReservedBits, the value of which is set to 0.

[0121] [Table 5]

[0122] [Table 6]

[0123] An example of SCI format 2-A will be described below.

[0124] In HARQ operation, if the HARQ-ACK information includes an ACK or a NACK, or if the HARQ-ACK information includes only a NACK, or if there is no feedback of the HARQ-ACK information, SCI format 2-A is used to decode the PSSCH.

[0125] The following information is transmitted via SCI Format 2-A.

[0126] - HARQ process number - 4 bits

[0127] -New Data Indicator - 1 bit

[0128] -redundancy version - 2 bits

[0129] - Source ID - 8 bits

[0130] -Destination ID - 16 bits

[0131] - HARQ feedback activation / deactivation indicator - 1 bit

[0132] Cast Type Indicator - 2 bits as defined in Table 7

[0133] - CSI Request - 1 bit

[0134] [Table 7]

[0135] An example of SCI format 2-B will be described below.

[0136] SCI format 2-B is used for decoding the PSSCH and is used with HARQ operation when the HARQ-ACK information includes only NACK or there is no feedback of HARQ-ACK information.

[0137] The following information is transmitted via SCI Format 2-B.

[0138] - HARQ process number - 4 bits

[0139] -New Data Indicator - 1 bit

[0140] -redundancy version - 2 bits

[0141] - Source ID - 8 bits

[0142] -Destination ID - 16 bits

[0143] - HARQ feedback activation / deactivation indicator - 1 bit

[0144] - Zone ID - 12 bits

[0145] - Range requirements - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0146] 6(a) or 6(b), in step S630, the first terminal may receive the PSFCH. For example, the first terminal and the second terminal may determine a PSFCH resource, and the second terminal may use the PSFCH resource to transmit HARQ feedback to the first terminal.

[0147] Referring to FIG. 6(a), in step S640, the first terminal can transmit SL HARQ feedback to the base station via the PUCCH and / or PUSCH.

[0148] FIG. 7 illustrates three cast types according to an embodiment of the present disclosure. The embodiment of FIG. 7 can be combined with various embodiments of the present disclosure. Specifically, (a) of FIG. 7 illustrates broadcast-type SL communication, (b) of FIG. 7 illustrates unicast-type SL communication, and (c) of FIG. 7 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, SL groupcast communication can be replaced with SL multicast communication, SL one-to-many communication, etc.

[0149] In this specification, the wording "configuration or definition" may be interpreted as being (pre)configured by a base station or a network (via predefined signaling (e.g., SIB, MAC signaling, RRC signaling)). For example, "A can be configured" may include "a base station or a network (pre)configuring / defining or informing a terminal of A." Alternatively, the wording "configuration or definition" may be interpreted as being pre-configured or defined by a system. For example, "A can be configured" may include "A is pre-configured / defined by a system."

[0150] Referring to the standard documents, some procedures and technical specifications relevant to this disclosure are as follows:

[0151] [Table 8]

[0152] [Table 9]

[0153] [Table 10]

[0154] [Table 11]

[0155] Meanwhile, Release 17NR V2X supports SL DRX operation. In one embodiment of the present disclosure, a method is proposed for canceling a transmission resource request (e.g., a triggered (pending) SR or BSR) procedure of a terminal performing sidelink operation. In the following description, "when, if, in case of" is replaced with "based on".

[0156] According to an embodiment of the present disclosure, a terminal performing SL DRX operation can operate in an active mode during DRX active time and perform PSCCH / PSSCH monitoring. On the other hand, during SL DRX inactive time, the terminal can operate in a sleep mode and not perform PSCCH / PSSCH monitoring for SL data reception. For example, the active time can include a period during which an on-duration timer, an inactivity timer, or a retransmission timer is operating, or a period during which the terminal operates in an active mode.

[0157] According to an embodiment of the present disclosure, the following SL DRX operation method is proposed.

[0158] For example, if a Mode 1 sidelink grant allocated to a transmitting terminal by a base station partially overlaps with the SL DRX active time of the receiving terminal, the terminal may transmit SL data to the receiving terminal with best effort so that even partially overlapping resources (i.e., initial transmission resources) are used as much as possible. For example, if the resource overlapping the SL DRX active time of a sidelink grant is not the first resource of the sidelink grant, the terminal may use the first resource overlapping the SL DRX active time, which is not the first resource of the sidelink grant, as the initial transmission resource.

[0159] 8 illustrates an embodiment in which an SL grant partially overlaps with the SL DRX active time of a receiving terminal according to an embodiment of the present disclosure. The embodiment of FIG. 8 can be combined with various embodiments of the present disclosure.

[0160] 8 illustrates resources (810, 820, 830) of an SL grant received by a transmitting terminal from a base station. For example, the transmitting terminal may use the first resource 810 among the resources for initial transmission of a MAC PDU. It is assumed that the receiving terminal is a terminal that performs SL DRX operation based on the SL DRX configuration. For example, among the resources 810 and 820, resources 810 and 820 may be included in the active time of the SL DRX configuration. For example, the term "partially overlapped" referred to in the present disclosure may refer to a case such as this embodiment in which some of the resources 810, 820, and 830, i.e., 810 and 820, overlap the active time.

[0161] 9 illustrates an embodiment in which an SL grant partially overlaps with an SL DRX active time of a receiving terminal according to an embodiment of the present disclosure. The embodiment of FIG. 9 can be combined with various embodiments of the present disclosure.

[0162] 9 illustrates resources (910, 920, 930) of an SL grant received by a transmitting terminal from a base station. It is assumed that the receiving terminal is a terminal that performs SL DRX operation based on the SL DRX configuration. For example, resources 920 and 930 may be included in the active time of the SL DRX configuration. For example, the transmitting terminal may use resource 920, which is included in the active time, of the resources (910, 920, 930), for initial transmission of a MAC PDU, rather than resource 910, which is the first resource among the resources. That is, the transmitting terminal may discard resource 910. For example, the term "partially overlapped" referred to in this disclosure may refer to a case such as this embodiment in which some of the resources 910, 920, and 930, i.e., 920 and 930, overlap the active time.

[0163] According to an embodiment of the present disclosure, a transmitting terminal may report SL HARQ feedback (ACK / NACK) received from a receiving terminal to a base station via a PUCCH linked with a sidelink mode 1 grant. If the transmitting terminal determines that retransmission resources are necessary, even in the case of a MAC PDU transmission in which HARQ feedback is disabled, the transmitting terminal may report a NACK to the base station via the PUCCH, and the base station may allocate the retransmission resources. For example, if the sidelink grant partially overlaps with the SL DRX active time of the receiving terminal, i.e., if an initial transmission resource is included in the active time and at least one retransmission resource is not included in the active time, the transmitting terminal may report a NACK to the base station via the PUCCH. Then, the base station may allocate the retransmission resources in response to the NACK.

[0164] 10 illustrates a procedure for a transmitting terminal to transmit NACK information when an SL grant partially overlaps with an SL DRX active time of a receiving terminal according to one embodiment of the present disclosure. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure.

[0165] Referring to FIG. 10, in step S1010, the transmitting terminal may acquire SL PUCCH configuration. For example, the following operations may be performed in a PUCCH transmission opportunity when the time alignment timer of the transmitting terminal is running. For example, the time alignment timer may be associated with a TAG including a serving cell to which HARQ feedback is transmitted. In step S1020, the transmitting terminal may acquire a MAC PDU for an SL grant associated with the PUCCH transmission opportunity. For example, the SL grant may include a configured grant or a dynamic grant. In step S1030, the transmitting terminal may transmit a HARQ NACK to the base station. For example, the transmission of the HARQ NACK may be performed based on the PSCCH interval and PSSCH interval for one or more retransmissions of a MAC PDU of the SL grant not being within an SL DRX active time. For example, the transmission of the HARQ NACK may be performed based on i) the most recent transmission of the MAC PDU being prioritized, ii) HARQ feedback for the MAC PDU being allowed or the next retransmission of the MAC PDU being necessary, iii) at least one of the PSCCH or PSSCH intervals for the initial transmission of the MAC PDU of the SL grant being within the SL DRX active time, or iv) HARQ feedback for the MAC PDU being allowed or the SL grant for the next retransmission of the MAC PDU being unavailable.

[0166] According to an embodiment of the present disclosure, if a Mode 1 sidelink grant allocated to a transmitting terminal by a base station partially overlaps with the SL DRX active period of a receiving terminal, the transmitting terminal may discard the allocated Mode 1 sidelink grant and report an ACK (or NACK) indication to the base station via a PUCCH. For example, the PUCCH (ACK or NACK) report may be a report intended to cause the base station to not allocate any more Mode 1 sidelink resources. For example, the PUCCH (NACK) report may be a report intended to cause the base station to reallocate Mode 1 sidelink resources.

[0167] According to an embodiment of the present disclosure, when a Mode 1 sidelink grant allocated to a transmitting terminal by a base station partially overlaps with the SL DRX active time of a receiving terminal, if the number of overlapping resources is less than the maximum number of transmissions configured by the base station, the transmitting terminal may discard the allocated Mode 1 sidelink grant and report an ACK (or NACK) indication to the base station via the PUCCH. For example, the maximum number of transmissions may be the maximum number of transmissions allowed for sidelink transmission or the maximum number of transmissions allowed for the TB configured in sl-CG-MaxTransNumlist. For example, the PUCCH (ACK or NACK) report may be a report intended to prevent the base station from allocating any more Mode 1 sidelink resources. For example, the PUCCH (NACK) report may be a report intended to cause the base station to reallocate Mode 1 sidelink resources.

[0168] According to an embodiment of the present disclosure, when a Mode 1 sidelink grant allocated to a transmitting terminal by a base station overlaps with a DRX active period of a receiving terminal, the maximum allowed number of overlapping resources for the overlapping Mode 1 sidelink grant may be equal to the maximum number of transmissions configured by the base station. For example, the maximum number of transmissions configured by the base station may include the maximum number of transmissions allowed for sidelink transmission or the maximum number of transmissions allowed for a TB configured in sl-CG-MaxTransNumlist.

[0169] According to an embodiment of the present disclosure, if the transmitting terminal does not receive any Mode 1 sidelink grants allocated by the base station during the SL DRX active period of the receiving terminal, the transmitting terminal may discard the allocated Mode 1 sidelink grants and report an ACK (or NACK) indication to the base station via the PUCCH. For example, the PUCCH (ACK or NACK) report may be intended to prompt the base station not to allocate Mode 1 sidelink resources any more. For example, the PUCCH (NACK) report may prompt the base station to reallocate Mode 1 sidelink resources.

[0170] According to an embodiment of the present disclosure, a method is proposed in which a transmitting terminal discards a Mode 1 sidelink grant allocated from a base station only if the Mode 1 sidelink grant allocated to the transmitting terminal does not belong to the DRX active time of all intended receiving terminals associated with all sidelink services (unicast, groupcast, and / or broadcast) of interest to the transmitting terminal, and uses the Mode 1 sidelink grant allocated from the base station otherwise, for example, because the Mode 1 sidelink grant allocated by the base station may be a common resource that can be used by all terminals.

[0171] For example, the proposed operation in this disclosure is a solution applicable to sidelink unicast, groupcast, and / or broadcast operations, e.g., the present disclosure is a solution applicable to both SL HARQ feedback granted MAC PDU transmission and SL HARQ feedback not granted MAC PDU transmission operations.

[0172] The SL DRX configuration referred to in this disclosure may include at least one or more of the following parameters:

[0173] [Table 12]

[0174] For example, the following SL DRX timers mentioned in this disclosure can be used in the following applications:

[0175] SL DRX on-duration timer: This can indicate the interval during which a terminal performing SL DRX operation must basically operate during active time to receive the PSCCH / PSSCH of the remote terminal.

[0176] SL DRX inactivity timer: This timer can indicate a period during which the SL DRX on duration period, which is a period during which a UE performing SL DRX operation must basically operate in an active time to receive the PSCCH / PSSCH of the remote UE, is extended. That is, the SL DRX on duration timer can be extended by the SL DRX inactivity timer period. Also, if the UE receives a new packet (new PSSCH transmission) from the remote UE, the UE can extend the SL DRX on duration timer by starting the SL DRX inactivity timer.

[0177] SL DRX HARQ RTT timer: This can indicate a period during which a terminal performing an SL DRX operation operates in a sleep mode until it receives a retransmission packet (or a PSSCH assignment) transmitted by a remote terminal. That is, when a terminal starts an SL DRX HARQ RTT timer, the terminal determines that the remote terminal will not transmit an SL retransmission packet to the terminal until the SL DRX HARQ RTT timer expires, and can operate in a sleep mode for the duration of the timer.

[0178] SL DRX retransmission timer: This can indicate an interval during which a terminal performing an SL DRX operation operates in an active time to receive a retransmission packet (or a PSSCH allocation) transmitted by a remote terminal. For example, when the SL DRX HARQ RTT timer expires, the SL DRX retransmission timer starts. During this timer interval, the terminal can monitor reception of a retransmission SL packet (or a PSSCH allocation) transmitted by the remote terminal.

[0179] For example, the following Uu DRX timers mentioned in this disclosure can be used for the following purposes:

[0180] drx-HARQ-RTT-TimerSL timer: This timer can indicate an interval during which a transmitting terminal (a terminal supporting Uu DRX operation) performing sidelink communication based on sidelink resource allocation mode 1 does not perform PDCCH (or DCI) monitoring for sidelink mode 1 resource allocation from the base station.

[0181] drx-Retransmission timerSL timer: This timer can indicate the interval during which a transmitting terminal (a terminal supporting Uu DRX operation) performing sidelink communication based on sidelink resource allocation mode 1 performs PDCCH (or DCI) monitoring for sidelink mode 1 resource allocation from the base station.

[0182] In addition, in the following description, the names of timers (SL DRX on duration timer, SL DRX inactivity timer, SL DRX HARQ RTT timer, SL DRX retransmission timer, etc.) are exemplary, and timers that perform the same / similar functions based on the contents described in each timer can be considered to be the same / similar timers regardless of their names.

[0183] The proposal of the present disclosure is a solution that can be applied and expanded as a method for solving the problem of loss due to interference that occurs when switching Uu BWP (band width part).

[0184] In addition, this solution can be applied and expanded as a method for solving the problem of loss due to interference that occurs when switching between SL BWPs when a terminal supports multiple SL BWPs.

[0185] The proposals of the present disclosure can be extended and applied not only to the default / common SL DRX setting or the default / common SL DRX pattern or the parameters (and timers) included in the default / common SL DRX setting, but also to the parameters (and timers) included in the SL DRX setting specific to a terminal pair or the SL DRX pattern specific to a terminal pair or the SL DRX setting specific to a terminal pair.

[0186] Furthermore, for example, the term "on-duration" referred to in the proposal of the present disclosure can be expanded to mean an active time period, and the term "off-duration" can be expanded to mean a sleep time period. For example, the active time can refer to a period during which a terminal operates in a wake-up state (a state in which the RF module is on) to receive / transmit a wireless signal. For example, the sleep time can refer to a period during which a terminal operates in a sleep mode state (a state in which the RF module is off) to save power. For example, a sleep time period does not necessarily mean that a transmitting terminal must operate in a sleep mode. That is, if necessary, the terminal can operate in an active time period for a while to perform a sensing operation / transmission operation, even during a sleep time period.

[0187] Furthermore, for example, the applicability and / or related parameters (e.g., thresholds) of (some) proposed methods / rules of the present disclosure may be set specifically (or differently or independently) depending on the resource pool, congestion level, service priority (and / or type), QoS requirements (e.g., delay, reliability) or PQI, traffic type (e.g., (a)periodic generation), SL transmission resource allocation mode (mode 1, mode 2), etc.

[0188] For example, whether the proposed rules of the present disclosure can be applied (and / or related parameter setting values) depends on the resource pool, service / packet type (and / or priority), QoS profile or QoS requirement (e.g., URLLC / EMBB traffic, reliability, delay), PQI, PFI, cast type (e.g., unicast, groupcast, broadcast), (resource pool) congestion level (e.g., CBR), SL HARQ feedback method (e.g., NACK-only feedback, ACK / NACK feedback), HARQ feedback enabled MAC PDU (and / or HARQ feedback disabled MAC PDU) transmission, PUCCH-based SL It may also be configured specifically (and / or independently and / or differently) for at least one of the following: whether to configure HARQ feedback reporting operation, whether to (not) configure preemption (and / or re-evaluation) (or based resource reselection), (L2 or L1) (source and / or destination) identifier, (L2 or L1) (combination of source layer ID and destination layer ID) identifier, (L2 or L1) (combination of source layer ID and destination layer ID pair and cast type) identifier, direction of source layer ID and destination layer ID pair, PC5 RRC connection / link, whether to perform SL DRX, SL mode type (resource allocation mode 1, resource allocation mode 2), and whether to perform (aperiodic) resource reservation.

[0189] For example, the term "certain time" mentioned in the proposal of the present disclosure may refer to a time in which a terminal operates in an active time for a predefined time to receive an SL signal or SL data from a counterpart terminal, or a time or a specific timer (SL DRX retransmission timer, SL DRX inactivity timer, or a timer that ensures that the receiving terminal can operate in an active time in its DRX operation).

[0190] Also, for example, the proposals and proposed rule applicability (and / or associated parameter settings) of this disclosure may also be applied to mm Wave SL operation.

[0191] 11 illustrates a procedure for a first device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure.

[0192] 11, in step S1110, a first device may receive information related to at least one first sidelink (SL) resource from a base station, including an initial transmission resource and at least one retransmission resource. In step S1120, the first device may acquire an SL discontinuous reception (DRX) configuration of a second device. For example, the SL DRX configuration includes at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer including at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX hybrid automatic repeat request (HARQ) round trip time (RTT) timer, and at least one of the running time of the SL DRX on-duration timer, the running time of the SL DRX inactivity timer, or the running time of the SL DRX retransmission timer may be included in the SL DRX active time of the second device. In step S1130, the first device may send a hybrid automatic repeat request (HARQ) negative acknowledge (NACK) to the base station based on the fact that the SL DRX active time does not include the at least one retransmission resource.

[0193] For example, the first device may further receive information related to at least one second SL resource from the base station, for example, the at least one second SL resource may be reallocated by the base station based on the HARQ NACK.

[0194] For example, the at least one second SL resource may be included in the SL DRX active time.

[0195] For example, the first device may further transmit, based on the at least one second SL resource, sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) via a physical sidelink control channel (PSCCH) to the second device; and, based on the at least one second SL resource, transmit a medium access control (MAC) protocol data unit (PDU) to the second device via the PSSCH.

[0196] For example, the transmission of a MAC PDU over the PSSCH may be an initial transmission.

[0197] For example, the transmission of a MAC PDU over the PSSCH may be a retransmission.

[0198] For example, SL HARQ feedback for the MAC PDU is allowed.

[0199] For example, SL HARQ feedback for the MAC PDU is disallowed.

[0200] For example, the first device may further send the SL DRX configuration to the second device.

[0201] For example, an initial transmission resource of the at least one first SL resource may be included in the SL DRX active time.

[0202] For example, the initial transmission resource can be used for initial transmission based on the fact that among the at least one first SL resource, resources beyond the initial transmission resource are not included in the SL DRX active time.

[0203] For example, the HARQ NACK may be transmitted based on the number of resources included in the SL DRX active time among the at least one first SL resource being less than a threshold.

[0204] For example, the threshold value may be a maximum number of transmissions for the MAC PDU set by the base station.

[0205] The above-described embodiment can be applied to various devices described below. First, the processor 102 of the first device 100 can control the transceiver 106 to receive information related to at least one first sidelink (SL) resource, including an initial transmission resource and at least one retransmission resource, from a base station. Then, the processor 102 of the first device 100 can acquire an SL discontinuous reception (DRX) configuration of the second device 200. For example, the SL DRX configuration includes at least one of information related to an SL DRX cycle or information related to an SL DRX timer, and the SL DRX timer includes at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer. At least one of the running time of the SL DRX on-duration timer, the running time of the SL DRX inactivity timer, or the running time of the SL DRX retransmission timer may be included in the SL DRX active time of the second device 200. Then, the processor 102 of the first device 100 may control the transceiver 106 to transmit a HARQ (hybrid automatic repeat request) NACK (negative acknowledgement) to the base station based on the fact that the SL DRX active time does not include the at least one retransmission resource.

[0206] According to one embodiment of the present disclosure, there is provided a first device for wireless communication, wherein the first device may include one or more memories for storing instructions; one or more transceivers; and one or more processors coupling the one or more memories and the one or more transceivers. For example, the one or more processors execute the instructions to receive, from a base station, information related to at least one first sidelink (SL) resource, including an initial transmission resource and at least one retransmission resource; acquire SL discontinuous reception (DRX) configuration of a second device, the SL DRX configuration including at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer including at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and at least one of a running time of the SL DRX on-duration timer, a running time of the SL DRX inactivity timer, or a running time of the SL DRX retransmission timer is included in the SL DRX active time of the second device; and acquire SL discontinuous reception (DRX) configuration of a second device, the SL DRX configuration including at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer including at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and at least one of a running time of the SL DRX on-duration timer, a running time of the SL DRX inactivity timer, or a running time of the SL DRX retransmission timer is included in the SL DRX active time of the second device; Based on the fact that the at least one retransmission resource is not included in the DRX active time, a hybrid automatic repeat request (HARQ) negative acknowledge (NACK) may be sent to the base station.

[0207] For example, the first device may further receive information related to at least one second SL resource from the base station, for example, the at least one second SL resource may be reallocated by the base station based on the HARQ NACK.

[0208] For example, the at least one second SL resource may be included in the SL DRX active time.

[0209] For example, the first device may further transmit, based on the at least one second SL resource, sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) via a physical sidelink control channel (PSCCH) to the second device; and, based on the at least one second SL resource, transmit a medium access control (MAC) protocol data unit (PDU) to the second device via the PSSCH.

[0210] For example, the transmission of a MAC PDU over the PSSCH may be an initial transmission.

[0211] For example, the transmission of a MAC PDU over the PSSCH may be a retransmission.

[0212] For example, SL HARQ feedback for the MAC PDU is allowed.

[0213] For example, SL HARQ feedback for the MAC PDU is disallowed.

[0214] For example, the first device may further send the SL DRX configuration to the second device.

[0215] For example, an initial transmission resource of the at least one first SL resource may be included in the SL DRX active time.

[0216] For example, the initial transmission resource can be used for initial transmission based on the fact that among the at least one first SL resource, resources beyond the initial transmission resource are not included in the SL DRX active time.

[0217] For example, the HARQ NACK may be transmitted based on the number of resources included in the SL DRX active time among the at least one first SL resource being less than a threshold.

[0218] For example, the threshold value may be a maximum number of transmissions for the MAC PDU set by the base station.

[0219] According to one embodiment of the present disclosure, there is provided an apparatus configured to control a first terminal, for example, the apparatus may include one or more processors; and one or more memories coupled to and storing instructions for execution by the one or more processors. For example, the one or more processors execute the instructions to receive, from a base station, information related to at least one first sidelink (SL) resource, including an initial transmission resource and at least one retransmission resource; acquire an SL discontinuous reception (DRX) configuration of a second terminal, the SL DRX configuration including at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer including at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and at least one of a running time of the SL DRX on-duration timer, a running time of the SL DRX inactivity timer, or a running time of the SL DRX retransmission timer is included in the SL DRX active time of the second terminal; and acquire an SL discontinuous reception (DRX) configuration of a second terminal, the SL DRX configuration including at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer including at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and at least one of a running time of the SL DRX on-duration timer, a running time of the SL DRX inactivity timer, or a running time of the SL DRX retransmission timer is included in the SL DRX active time of the second terminal; Based on the fact that the at least one retransmission resource is not included in the DRX active time, a hybrid automatic repeat request (HARQ) negative acknowledge (NACK) may be sent to the base station.

[0220] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having instructions recorded thereon is provided. For example, when executed, the instructions cause the first device to: receive information related to at least one first sidelink (SL) resource from a base station, the information including an initial transmission resource and at least one retransmission resource; acquire SL discontinuous reception (DRX) configuration of a second device, the SL DRX configuration including at least one of information related to an SL DRX cycle or information related to an SL DRX timer, the SL DRX timer including at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer, and at least one of a running time of the SL DRX on-duration timer, a running time of the SL DRX inactivity timer, or a running time of the SL DRX retransmission timer is included in the SL DRX active time of the second device; and When the at least one retransmission resource is not included in the DRX active time, a hybrid automatic repeat request (HARQ) negative acknowledge (NACK) may be transmitted to the base station.

[0221] 12 illustrates a procedure for a second device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 12 can be combined with various embodiments of the present disclosure.

[0222] 12, in step S1210, a second device may acquire a sidelink (SL) discontinuous reception (DRX) configuration. In step S1220, the second device may receive sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) via a physical sidelink control channel (PSCCH) from a first device based on at least one second SL resource. In step S1230, the second device may receive a medium access control (MAC) protocol data unit (PDU) from the first device via the PSSCH based on the at least one second SL resource. For example, based on a hybrid automatic repeat request (HARQ) negative acknowledge (NACK), the at least one second SL resource reallocated by the base station from at least one first SL resource is included in the SL DRX active time, and the HARQ NACK can be transmitted from the first device to the base station based on the at least one retransmission resource included in the at least one first SL resource not being included in the SL DRX active time.

[0223] For example, an initial transmission resource of the at least one first SL resource may be included in the SL DRX active time.

[0224] The above-described embodiment can be applied to various devices described below. First, the processor 202 of the second device 200 can acquire a sidelink (SL) discontinuous reception (DRX) configuration. Then, the processor 202 of the second device 200 can control the transceiver 206 to receive sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) via a physical sidelink control channel (PSCCH) from the first device 100 based on at least one second SL resource. Then, the processor 202 of the second device 200 can control the transceiver 206 to receive medium access control (MAC) protocol data units (PDUs) from the first device 100 via the PSSCH based on the at least one second SL resource. For example, based on a hybrid automatic repeat request (HARQ) negative acknowledge (NACK), the at least one second SL resource reallocated by the base station from the at least one first SL resource is included in the SL DRX active time, and the HARQ NACK can be transmitted from the first device 100 to the base station based on the at least one retransmission resource included in the at least one first SL resource not being included in the SL DRX active time.

[0225] According to one embodiment of the present disclosure, there is provided a second device for wireless communication, wherein the second device may include one or more memories for storing instructions, one or more transceivers, and one or more processors coupling the one or more memories and the one or more transceivers. For example, the one or more processors execute the instructions to acquire a sidelink (SL) discontinuous reception (DRX) configuration; receive sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) from a first device via a physical sidelink control channel (PSCCH) based on at least one second SL resource; and receive a medium access control (MAC) protocol data unit (PDU) from the first device via the PSSCH based on the at least one second SL resource, but based on a hybrid automatic repeat request (HARQ) negative acknowledge (NACK), the at least one second SL resource reallocated by a base station from at least one first SL resource is included in the SL DRX active time, and the HARQ NACK can be transmitted from the first device to the base station based on at least one retransmission resource included in the at least one first SL resource not being included in the SL DRX active time.

[0226] For example, an initial transmission resource of the at least one first SL resource may be included in the SL DRX active time.

[0227] Various embodiments of the present disclosure may be interconnected.

[0228] Hereinafter, a description will be given of an apparatus to which various embodiments of the present disclosure can be applied.

[0229] 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 (e.g., 5G) between devices.

[0230] Hereinafter, the present invention will be described in more detail with reference to the drawings. In the following drawings / descriptions, the same reference numerals may represent the same or corresponding hardware blocks, software blocks, or function blocks unless otherwise stated.

[0231] 13 illustrates a communication system 1 according to one embodiment of the present disclosure. The embodiment of FIG. 13 can be combined with various embodiments of the present disclosure.

[0232] 13 , a communication system 1 to which various embodiments of the present disclosure are applied includes wireless devices, base stations, and a network. Here, the wireless devices refer to devices that perform communication using wireless connection technologies (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and are referred to as communication / wireless / 5G devices. Without being limited thereto, the wireless devices may include a robot 100a, vehicles 100b-1 and 100b-2, an XR (eXtended Reality) device 100c, a handheld device 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI device / server 400. For example, the vehicles may include vehicles equipped with wireless communication capabilities, autonomous vehicles, vehicles capable of performing inter-vehicle communication, etc. Here, the vehicles may include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices include Augmented Reality (AR), Virtual Reality (VR), and 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. Mobile devices may include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebooks, etc.), etc. Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a base station or 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.

[0233] 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 (NIT) for low-power communication. Here, for example, NB-IoT technology is an example of Low Power Wide Area Network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1 and / or LTE Cat NB2, 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. Here, for example, LTE-M technology is an example of LPWAN technology and is referred to by various names such as enhanced Machine Type Communication (eMTC). 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. Additionally, or generally, the wireless communication technology implemented in wireless devices 100a-100f herein may include, but is not limited to, at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN), which are considered low-power communications. For example, ZigBee technology is based on various standards, such as IEEE 802.15.4, and can create personal area networks (PANs) related to small / low-power digital communications, and is referred to by various names.

[0234] The wireless devices 100a to 100f may be connected to a network 300 via a base station 200. Artificial Intelligence (AI) 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, or may communicate directly with each other (e.g., sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may communicate directly with each other (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). Furthermore, an IoT device (for example, a sensor) can directly communicate with another IoT device (for example, a sensor) or another wireless device 100a to 100f.

[0235] Wireless communication / connections 150a, 150b, and 150c can be established between the wireless devices 100a to 100f and the base station 200, and between the base stations 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, Integrated Access Backhaul (IAB)). Through the wireless communication / connections 150a, 150b, and 150c, wireless devices and base stations, and base stations, can transmit / receive wireless signals to / from each other. For example, the wireless communication / connections 150a, 150b, and 150c can 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.

[0236] 14 illustrates a wireless device according to one embodiment of the present disclosure. The embodiment of FIG. 14 can be combined with various embodiments of the present disclosure.

[0237] 14, a first wireless device 100 and a second wireless device 200 may transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR), where {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.

[0238] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and / or one or more antennas 108. The 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 flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate 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 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 for implementing the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. Here, the processor 102 and the memory 104 are part of a communications 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 referred to as a radio frequency (RF) unit. In this disclosure, a wireless device may also refer to a communications modem / circuit / chip.

[0239] The second wireless device 200 includes one or more processors 202, one or more memories 204, and may additionally 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 flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate 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 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 flowcharts disclosed herein. Here, the processor 202 and the memory 204 are part of a communications 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 referred to as an RF unit. In this disclosure, a wireless device may also refer to a communications modem / circuit / chip.

[0240] The hardware elements of the wireless devices 100, 200 will be described in more detail below. Without limitation, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). 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) in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts 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 according to the functions, procedures, suggestions, and / or methods disclosed herein to the one or more transceivers 106, 206. 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.

[0241] 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. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts 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 flowcharts 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 flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions, and / or collections of instructions.

[0242] One or more memories 104, 204 may be coupled to 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. The one or more memories 104, 204 may also be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0243] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or operational flowcharts 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 flowcharts 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. Furthermore, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208 and configured to transmit and receive user data, control information, radio signals / channels, etc., referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein via one or more antennas 108, 208. In this document, one or more antennas may refer to 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 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.

[0244] 15 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure. The embodiment of FIG. 15 can be combined with various embodiments of the present disclosure.

[0245] Referring to FIG. 15, a 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. 15 may be performed by the processors 102 and 202 and / or the transceivers 106 and 206 of FIG. 14. The hardware elements of FIG. 15 may be embodied in the processors 102 and 202 and / or the transceivers 106 and 206 of FIG. 14. For example, blocks 1010 to 1060 may be embodied in the processors 102 and 202 of FIG. 14. Furthermore, blocks 1010 to 1050 may be embodied in the processors 102 and 202 of FIG. 14, and block 1060 may be embodied in the transceivers 106 and 206 of FIG. 14.

[0246] The codeword can be converted into a radio signal via the signal processing circuit 1000 of FIG. 15. Here, the codeword is an encoded bit sequence of an information block. The information block can include a transmission block (e.g., a UL-SCH transmission block, a DL-SCH transmission block). The radio signal can be transmitted via various physical channels (e.g., a PUSCH, a PDSCH).

[0247] 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, which may include ID information of the wireless device. The scrambled bit sequence may be modulated into a modulation symbol sequence by the modulator 1020. Modulation schemes may include pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature Amplitude Modulation (m-QAM), 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 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 an N*M precoding matrix W. 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) on complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0248] The resource mapper 1050 can map modulation symbols for each antenna port to time-frequency resources. The time-frequency resources can include multiple symbols (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and multiple subcarriers in the frequency domain. The signal generator 1060 generates wireless signals from the mapped modulation symbols, and the generated wireless signals 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, etc.

[0249] In a wireless device, the signal processing process for a received signal may be configured as the inverse of the signal processing processes 1010 to 1060 in FIG. 15. For example, a wireless device (e.g., 100 or 200 in FIG. 14) may receive a wireless signal from an external device via an antenna port / transceiver. The received wireless signal may be converted to a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. 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.

[0250] 16 illustrates a wireless device according to an embodiment of the present disclosure. The wireless device may be implemented in various forms depending on the use case / service (see FIG. 13). The embodiment of FIG. 16 may be combined with various embodiments of the present disclosure.

[0251] 16, wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 14 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 additional elements 140. The communication unit may include a communication circuit 112 and transceiver(s) 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and / or one or more memories 104 and 204 of FIG. 14. For example, the transceiver(s) 114 may include one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 of FIG. 14. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional elements 140 and controls the overall operation of the wireless device. For example, the control unit 120 can control the 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 the communication unit 110 via a wireless / wired interface, or can store information received from an external device (e.g., another communication device) via the communication unit 110 via a wireless / wired interface in the memory unit 130.

[0252] 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. 13), a vehicle (100b-1, 100b-2 in FIG. 13), an XR device (100c in FIG. 13), a mobile device (100d in FIG. 13), a home appliance (100e in FIG. 13), an IoT device (100f in FIG. 13), 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. 13), a base station (200 in FIG. 13), a network node, etc. The wireless device may be mobile or fixed depending on the use case / service.

[0253] 16, various elements, components, units / sections, and / or modules within the wireless devices 100 and 200 may be interconnected entirely via a wired interface, or at least some may be connected wirelessly via the communication unit 110. For example, within the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected via a wire, and the control unit 120 and a first unit (e.g., 130, 140) may be connected wirelessly via the communication unit 110. Furthermore, each element, component, unit / section, and / or module within 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.

[0254] The embodiment of FIG. 16 will now be described in more detail with reference to other drawings.

[0255] FIG. 17 illustrates a mobile device according to one embodiment of the present disclosure. The mobile device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), or a portable computer (e.g., a laptop). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT). The embodiment of FIG. 17 may be combined with various embodiments of the present disclosure.

[0256] 17, a 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. 16, respectively.

[0257] 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 the 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, and instructions required to operate the portable device 100. The memory unit 130 can also store input / output data / information. 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 and 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.

[0258] 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. The communication unit 110 may also receive wireless signals from another wireless device or a base station and 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.

[0259] 18 illustrates a vehicle or an autonomous vehicle according to an embodiment of the present disclosure. The vehicle or autonomous vehicle may be a mobile robot, a car, a train, an aerial vehicle (AV), a ship, etc. The embodiment of FIG. 18 may be combined with various embodiments of the present disclosure.

[0260] 18, a vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 16, respectively.

[0261] 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, roadside units, etc.), and servers. The control unit 120 can control elements of the vehicle or autonomous vehicle 100 and 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 travel on the ground. The driving unit 140a can include an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and can include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, 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.

[0262] 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 (e.g., adjusting speed / direction) so that the vehicle or autonomous vehicle 100 moves along the autonomous driving route according to the driving plan. During 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 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 regarding the vehicle position, autonomous driving route, driving plan, etc. to an external server. The external server may predict traffic information data in advance using AI technology based on information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0263] The claims described herein may be combined in various ways. For example, technical features of method claims herein may be combined and embodied in an apparatus, and technical features of apparatus claims herein may be combined and embodied in a method. Furthermore, technical features of method claims herein and technical features of apparatus claims herein may be combined and embodied in an apparatus, and technical features of method claims herein and technical features of apparatus claims herein may be combined and embodied in a method.

Claims

1. A method performed by a first device, comprising: receiving information related to at least one first sidelink (SL) resource from a base station, the at least one first SL resource including an initial transmission resource and at least one retransmission resource; acquiring a SL DRX (discontinuous reception) setting of the second device, The SL DRX configuration includes at least one of information related to an SL DRX cycle or information related to an SL DRX timer; the SL DRX timer includes at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer; At least one of a time during which the SL DRX on duration timer is running, a time during which the SL DRX inactivity timer is running, or a time during which the SL DRX retransmission timer is running is included in an SL DRX active time of the second device; and transmitting a HARQ negative acknowledge (NACK) to the base station based on the SL DRX active time not including the at least one retransmission resource.

2. receiving information related to at least one second SL resource from the base station; The method of claim 1 , wherein the at least one second SL resource is reallocated by the base station based on the HARQ NACK.

3. The method of claim 2 , wherein the at least one second SL resource is included in the SL DRX active time.

4. transmitting sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) to the second device via a physical sidelink control channel (PSCCH) based on the at least one second SL resource; 3. The method of claim 2, further comprising: transmitting a medium access control (MAC) protocol data unit (PDU) via the PSSCH to the second device based on the at least one second SL resource.

5. The method of claim 4 , wherein the transmission of the MAC PDU over the PSSCH is an initial transmission.

6. The method of claim 4 , wherein the transmission of the MAC PDU over the PSSCH is a retransmission.

7. The method of claim 4 , wherein SL HARQ feedback for the MAC PDU is allowed.

8. The method of claim 4 , wherein SL HARQ feedback for the MAC PDU is not allowed.

9. The method of claim 1 , further comprising the step of transmitting the SL DRX configuration to the second device.

10. The method of claim 1 , wherein the initial transmission resource of the at least one first SL resource is included in the SL DRX active time.

11. The method of claim 10 , wherein the initial transmission resource is used for the initial transmission based on the at least one first SL resource that precedes the initial transmission not being included in the SL DRX active time.

12. The method of claim 1 , wherein the HARQ NACK is transmitted based on the number of the at least one first SL resource included in the SL DRX active time being less than a threshold.

13. The method of claim 12 , wherein the threshold is a maximum number of transmissions for a MAC PDU set by the base station.

14. In the first device, at least one transceiver; at least one processor; coupled to and executing on the at least one processor, receiving information related to at least one first sidelink (SL) resource from a base station, the at least one first SL resource including an initial transmission resource and at least one retransmission resource; acquiring a SL DRX (discontinuous reception) setting of a second device, The SL DRX configuration includes at least one of information related to an SL DRX cycle or information related to an SL DRX timer; the SL DRX timer includes at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer; At least one of a time during which the SL DRX on duration timer is running, a time during which the SL DRX inactivity timer is running, or a time during which the SL DRX retransmission timer is running is included in an SL DRX active time of the second device; and and transmitting a HARQ negative acknowledgement (NACK) to the base station based on the SL DRX active time not including the at least one retransmission resource.

15. a processing device adapted to control a first device, at least one processor; coupled to and executing on the at least one processor, receiving information related to at least one first sidelink (SL) resource from a base station, the at least one first SL resource including an initial transmission resource and at least one retransmission resource; acquiring a SL DRX (discontinuous reception) setting of a second device, The SL DRX configuration includes at least one of information related to an SL DRX cycle or information related to an SL DRX timer; the SL DRX timer includes at least one of an SL DRX on-duration timer, an SL DRX inactivity timer, an SL DRX retransmission timer, or an SL DRX HARQ (hybrid automatic repeat request) RTT (round trip time) timer; At least one of a time during which the SL DRX on duration timer is running, a time during which the SL DRX inactivity timer is running, or a time during which the SL DRX retransmission timer is running is included in an SL DRX active time of the second device; and and transmitting a HARQ negative acknowledgement (NACK) to the base station based on the SL DRX active time not including the at least one retransmission resource.

Images