Method and apparatus for starting SL DRX timer based on DCI in NR V2X

Abstract

A method for a first device to perform wireless communication and a device supporting the same are provided, the method including the steps of: acquiring a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer, receiving downlink control information (DCI) from a base station including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource based on a physical downlink control channel (PDCCH) resource, and starting the HARQ RTT timer after a time domain of the PDCCH resource based on the PUCCH resource being not configured for the first device, the HARQ RTT timer being a minimum duration before a retransmission grant is expected by the first device.

Description

[Technical field]

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

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

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

[0004] On the other hand, a UE performing SL communication based on resource allocation mode 1 can receive an SL grant from a base station and can perform SL transmission based on the SL grant. On the other hand, for UE power saving, when a Uu DRX configuration and / or a SL DRX configuration is configured for the UE, it is necessary to clearly define a time period during which the UE needs to operate in an active time to receive an SL grant and / or a time period during which the UE is not expected to receive an SL grant. [Means for solving the problem]

[0005] In one embodiment, a method for a first device to perform wireless communication is provided, the method including the steps of: acquiring a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer, receiving downlink control information (DCI) from a base station including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource based on a physical downlink control channel (PDCCH) resource, and starting the HARQ RTT timer from a time domain of the PDCCH resource on the basis that the PUCCH resource is not configured for the first device, the HARQ RTT timer being a minimum duration before a retransmission grant is expected by the first device.

[0006] In one embodiment, a first device for wireless communication is provided. The first 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. The one or more processors execute the instructions to obtain a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer, receive downlink control information (DCI) from a base station including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource based on a physical downlink control channel (PDCCH) resource, and start the HARQ RTT timer from a time domain of the PDCCH resource on the basis that the PUCCH resource is not configured for the first device, the HARQ RTT timer being a minimum duration before a retransmission grant is expected by the first device.

[0007] In one embodiment, an apparatus configured to control a first terminal is provided. The apparatus may include one or more processors and one or more memories coupled for execution by the one or more processors and storing instructions. The one or more processors execute the instructions to obtain a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer, receive downlink control information (DCI) from a base station including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource based on a physical downlink control channel (PDCCH) resource, and start the HARQ RTT timer from a time domain of the PDCCH resource on the basis that the PUCCH resource is not configured for the first terminal, the HARQ RTT timer being a minimum duration before a retransmission grant is expected by the first terminal. Effect of the Invention

[0008] The energy saving gain of the terminal can be maximized, and the reliability of SL communication can be ensured. [Brief description of the drawings]

[0009] [Figure 1] 1 illustrates a structure of an NR system according to one embodiment of the present disclosure. [Diagram 2] 1 illustrates a radio protocol architecture according to one embodiment of the present disclosure. [Diagram 3] 1 illustrates a structure of an NR radio frame according to one embodiment of the present disclosure. [Figure 4] 1 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. [Diagram 5] 1 illustrates an example of a BWP according to one embodiment of the present disclosure. [Figure 6] According to one embodiment of the present disclosure, a procedure in which a terminal performs V2X or SL communication depending on a transmission mode is shown. [Figure 7] 1 illustrates three cast types according to one embodiment of the present disclosure. [Figure 8] According to one embodiment of the present disclosure, a procedure for a UE to start a Uu DRX timer based on a SL grant is shown. [Figure 9] According to an embodiment of the present disclosure, a method for a UE to start a MODE 1 DCI monitoring related Uu DRX timer based on a MODE 1 SL grant related resource when a PUCCH resource is not configured is illustrated. [Figure 10] 1 illustrates a case where the UE starts the HARQ RTT timer based on a SL resource that is not a PDCCH resource. [Figure 11] This figure illustrates a problem in which, when the transmission pools of UEs performing sidelink transmission and reception are different, the RX UE cannot correctly derive the next transmission resource information included in the SCI transmitted by the TX UE. [Figure 12] According to one embodiment of the present disclosure, a method for a first device to perform wireless communication is illustrated. [Figure 13] According to one embodiment of the present disclosure, a method for a base station to perform wireless communication is disclosed. [Figure 14] 1 illustrates a communication system 1 according to an embodiment of the present disclosure. [Figure 15] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 16] 1 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure. [Figure 17] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 18] 1 illustrates a mobile device according to one embodiment of the present disclosure. [Figure 19] 1 illustrates a vehicle or autonomous vehicle, according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] As used herein, "A or B" may mean "only A," "only B," or "both A and B." Also, as used herein, "A or B" may be interpreted as "A and / or B." For example, as used herein, "A, B or C" may mean "only A," "only B," "only C," or "any combination of A, B and C."

[0011] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Thus, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0012] In this specification, "at least one of A and B" can mean "only A", "only B", or "both A and B". In addition, in this specification, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted as "at least one of A and B".

[0013] In addition, in this specification, "at least one of A, B and C" can mean "only A," "only B," "only C," or "any combination of A, B and C." In addition, "at least one of A, B or C" or "at least one of A, B and / or C" can mean "at least one of A, B and C."

[0014] In addition, parentheses used in the present specification may mean "for example." Specifically, when "control information (PDCCH)" is used, "PDCCH" is proposed as an example of "control information." In addition, "control information" in the present specification is not limited to "PDCCH," and "PDCCH" is proposed as an example of "control information." In addition, when "control information (i.e., PDCCH)" is used, "PDCCH" is proposed as an example of "control information."

[0015] In the following description, "when, if, in case of" may be replaced with "based on".

[0016] In this specification, technical features individually described in one drawing may be embodied individually or simultaneously.

[0017] In this specification, a higher layer parameter may be a parameter that is configured, preconfigured, or predefined for a terminal. For example, a base station or a network may transmit the higher layer parameter to a terminal. For example, the higher layer parameter may be transmitted via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0018] The following technologies can be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented in wireless technologies such as universal terrestrial radio access (UTRA) and CDMA2000. TDMA can be implemented in wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented in wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (registered trademark) (3rd generation partnership project) LTE (long term evolution) employs OFDMA on the downlink and SC-FDMA on the uplink as part of evolved UMTS (E-UMTS) that uses evolved-UMTS terrestrial radio access (E-UTRA). LTE-A (advanced) is an evolution of 3GPP LTE.

[0019] 5G NR is a successor technology to LTE-A and is a new clean-slate type mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, including low frequency bands below 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequency (millimeter wave) bands above 24 GHz.

[0020] For clarity of explanation, the following description will focus on 5G NR, but the technical idea of ​​an embodiment of the present disclosure is not limited thereto.

[0021] 1 shows a 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.

[0022] Referring to FIG. 1, the NG-RAN (Next Generation-Radio Access Network) may include a base station 20 that provides a terminal 10 with protocol termination of a user plane and a control plane. For example, the base station 20 may include a gNB (next generation-NodeB) and / or an eNB (evolved-NodeB). For example, the terminal 10 may be fixed or mobile, and may be referred to as other terms such as a MS (Mobile Station), a UT (User Terminal), a SS (Subscriber Station), a MT (Mobile Terminal), a Wireless Device, etc. For example, the base station is a fixed station that communicates with the terminal 10, and may be referred to as other terms such as a BTS (Base Transceiver System), an Access Point, etc.

[0023] The embodiment of FIG. 1 illustrates a case where only gNBs are included. The base stations 20 may be connected to each other via an Xn interface. The base stations 20 may be connected to a fifth generation core network (5G Core Network: 5GC) via an NG interface. More specifically, the base station 20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a user plane function (UPF) 30 via an NG-U interface.

[0024] The radio interface protocol layers between a terminal and a network can be divided into L1 (first layer), L2 (second layer), and L3 (third layer) based on the three lowest layers of the Open System Interconnection (OSI) reference model widely known in communication systems. Among these, the physical layer belonging to the first layer provides an information transfer service using a physical channel, and the Radio Resource Control (RRC) layer located in the third layer plays a role in controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

[0025] FIG. 2 illustrates a radio protocol architecture according to an embodiment of the present disclosure. The embodiment of FIG. 2 can be combined with various embodiments of the present disclosure. Specifically, FIG. 2(a) illustrates a radio protocol stack of a user plane for Uu communication, and FIG. 2(b) illustrates a radio protocol stack of a control plane for Uu communication. FIG. 2(c) illustrates a radio protocol stack of a user plane for SL communication, and FIG. 2(d) illustrates a radio protocol stack of a control plane for SL communication.

[0026] Referring to FIG. 2, the physical layer provides information transfer services to a higher layer using physical channels. The physical layer is connected to a higher layer, the Medium Access Control (MAC) layer, via transport channels. Data moves between the MAC layer and the physical layer via the transport channels. Transport channels are classified according to how and what characteristics data is transmitted over the radio interface.

[0027] Data is transferred between different physical layers, i.e., between the physical layers of a transmitter and a receiver, via a physical channel, which may be modulated by an Orthogonal Frequency Division Multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.

[0028] 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.

[0029] The RLC layer performs concatenation, segmentation, and reassembly of RLC SDUs (Service Data Units). To guarantee various Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three operation modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction via automatic repeat request (ARQ).

[0030] The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transmission channels, and physical channels in relation to the configuration, re-configuration, and release of radio bearers. RB refers to the logical path provided by layer 1 (physical layer or PHY layer) and layer 2 (MAC layer, RLC layer, PDCP (Packet Data Convergence Protocol) layer, SDAP (Service Data Adaptation Protocol) layer) for data transmission between the terminal and the network.

[0031] The functions of the PDCP layer in the user plane include transmission of user data, header compression, and ciphering, and the functions of the PDCP layer in the control plane include transmission of control plane data and encryption / integrity protection.

[0032] 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.

[0033] RB configuration refers to the process of defining the characteristics of the radio protocol layer and channel to provide a specific service and setting each specific parameter and operation method. RB is divided into two types: SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). SRB is used as a path to transmit RRC messages in the control plane, and DRB is used as a path to transmit user data in the user plane.

[0034] 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 can maintain a connection with the core network and release the connection with the base station.

[0035] Downlink transport channels for transmitting data from a network to a terminal include a Broadcast Channel (BCH) for transmitting system information and a Shared Channel (SCH) for transmitting user traffic and control messages. Traffic or control messages of downlink multicast or broadcast services can be transmitted via the downlink SCH or via a separate Multicast Channel (MCH). Meanwhile, uplink transport channels for transmitting data from a terminal to a network include a Random Access Channel (RACH) for transmitting initial control messages and a Shared Channel (SCH) for transmitting user traffic and control messages.

[0036] Above the transport channel, logical channels that are mapped to the transport channel include the Broadcast Control Channel (BCCH), the Paging Control Channel (PCCH), the Common Control Channel (CCCH), the Multicast Control Channel (MCCH), and the Multicast Traffic Channel (MTCH).

[0037] 3 illustrates a structure of a radio frame 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.

[0038] Referring to FIG. 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 a subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM(A) symbols depending on a cyclic prefix (CP).

[0039] If normal CP is used, each slot can contain 14 symbols. If extended CP is used, each slot can contain 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), Single Carrier-FDMA (SC-FDMA) symbols (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbols).

[0040] Table 1 below illustrates the number of symbols per slot (Nslotsymb), the number of slots per frame (Nframe,uslot), and the number of slots per subframe (Nsubframe,uslot) according to the SCS setting (u) when a normal CP is used.

[0041] [Table 1]

[0042] 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.

[0043] [Table 2]

[0044] In the NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) can be set to be different between multiple cells merged into one terminal, and thus, the (absolute time) duration of time resources (e.g., subframes, slots, or TTIs) (commonly referred to as TUs (Time Units) for convenience) consisting of the same number of symbols can be set to be different between the merged cells.

[0045] In NR, multiple numerologies or SCSs to support various 5G services can be supported. For example, if the SCS is 15 kHz, a wide area in a traditional cellular band can be supported, and if the SCS is 30 kHz / 60 kHz, dense-urban, lower latency, and wider carrier bandwidth can be supported. If the SCS is 60 kHz or higher, a bandwidth larger than 24.25 GHz can be supported to overcome phase noise.

[0046] The NR frequency band can be defined into two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The values ​​of the frequency ranges can be changed, and for example, the two types of frequency ranges are as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean the "sub 6GHz range" and FR2 can mean the "above 6GHz range" and can be called millimeter wave (mmW).

[0047] [Table 3]

[0048] As described above, the values ​​of the frequency range of the NR system may be changed. For example, FR1 may include a band of 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, the frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher included in FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, for example, for communication for vehicles (e.g., autonomous driving).

[0049] [Table 4]

[0050] 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.

[0051] 4, a slot includes a number of symbols in the time domain. For example, in the case of the normal CP, one slot may include 14 symbols, and in the case of the extended CP, one slot may include 12 symbols. Alternatively, in the case of the normal CP, one slot may include 7 symbols, and in the case of the extended CP, one slot may include 6 symbols.

[0052] 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 an activated BWP. Each element is called a resource element (RE) in the resource grid, and one complex symbol can be mapped to it.

[0053] The following explains BWP (Bandwidth Part) and carriers.

[0054] A Bandwidth Part (BWP) is a contiguous set of physical resource blocks (PRBs) in a given numerology. A PRB can be selected from a contiguous subset of common resource blocks (CRBs) for a given numerology on a given carrier.

[0055] For example, the BWP is at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor downlink radiolink quality in DL BWPs other than an active DL BWP on a primary cell (PCell). For example, the UE does not receive a PDCCH, a physical downlink shared channel (PDSCH), or a CSI-RS (reference signal) (without RRM) outside an active DL BWP. For example, the UE does not trigger a CSI (Channel State Information) report for an inactive DL BWP. For example, the UE does not transmit a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel) outside an active UL BWP. For example, when in the downlink, the initial BWP is given as a contiguous RB set for a remaining minimum system information (RMSI) CORESET (control resource set) (set by a physical broadcast channel (PBCH)). For example, in the uplink, the initial BWP is provided by a system information block (SIB) for a random access procedure. For example, the default BWP is configured by a higher layer. For example, the initial value of the default BWP is the initial DL BWP. In order to save energy, when the terminal cannot detect DCI for a certain period of time, the terminal can switch the active BWP of the terminal to the default BWP.

[0056] Meanwhile, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting terminal can transmit an SL channel or an SL signal on a specific BWP, and a receiving terminal can receive an SL channel or an SL signal on the specific BWP. In a licensed carrier, an SL BWP can be defined separately from a Uu BWP, and the SL BWP can have separate configuration signaling from the Uu BWP. For example, a terminal can receive a configuration for an SL BWP from a base station / network. For example, a terminal can receive a configuration for a Uu BWP from a base station / network. An SL BWP can be (pre) configured for out-of-coverage NR V2X terminals and RRC_IDLE terminals in a carrier. At least one SL BWP can be activated in a carrier for a terminal in an RRC_CONNECTED mode.

[0057] 5 shows 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.

[0058] Referring to Figure 5, CRB (common resource block) is a carrier resource block numbered from one end of a carrier band to the other end, and PRB is a resource block numbered within each BWP. Point A may indicate a common reference point for a resource block grid.

[0059] The BWP can be set by point A, an offset from point A (NstartBWP), and a bandwidth (NsizeBWP). For example, point A is the outer 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.

[0060] The following describes V2X or SL communication.

[0061] The SLSS (Sidelink Synchronization Signal) is a SL-specific sequence and may include a PSSS (Primary Sidelink Synchronization Signal) and a SSSS (Secondary Sidelink Synchronization Signal). The PSSS may be referred to as an S-PSS (Sidelink Primary Synchronization Signal), and the SSSS may be referred to as an S-SSS (Sidelink Secondary Synchronization Signal). For example, length-127 M-sequences may be used for the S-PSS, and length-127 Gold sequences may be used for the S-SSS. For example, the terminal may perform initial signal detection and obtain synchronization using the S-PSS. For example, the terminal may obtain detailed synchronization and detect a synchronization signal ID using the S-PSS and S-SSS.

[0062] The PSBCH (Physical Sidelink Broadcast Channel) is a (broadcast) channel that transmits basic (system) information that a terminal should know first before transmitting and receiving an SL signal. For example, the basic information includes information related to SLSS, duplex mode (DM), TDDUL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool related information, application type related to SLSS, subframe offset, broadcast information, etc. For example, for evaluation of PSBCH performance, in NR V2X, the size of the PSBCH payload is 56 bits including a 24-bit CRC (Cyclic Redundancy Check).

[0063] The S-PSS, S-SSS, and PSBCH can be included in a block format (e.g., an SLSS (Synchronization Signal) / PSBCH block, hereinafter, S-SSB (Sidelink-Synchronization Signal Block)) that supports periodic transmission. The S-SSB can have the same numerology (i.e., SCS and CP length) as a PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) in a carrier, and the transmission bandwidth is within a (pre-) configured SL BWP (Sidelink Bandwidth Part). For example, the bandwidth of the S-SSB is 11 RBs (Resource Blocks). For example, the PSBCH spans 11 RBs. And the frequency location of the S-SSB can be (pre-) configured. Therefore, the terminal does not need to perform hypothesis detection in frequency to find the S-SSB in the carrier.

[0064] FIG. 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 may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for convenience of 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.

[0065] For example, (a) of FIG 6 illustrates a terminal operation associated with LTE transmission mode 1 or LTE transmission mode 3. Or, for example, (a) of FIG 6 illustrates a terminal operation associated with NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to general SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0066] For example, FIG. 6(b) illustrates terminal operation associated with LTE transmission mode 2 or LTE transmission mode 4. Or, for example, FIG. 6(b) illustrates terminal operation associated with NR resource allocation mode 2.

[0067] Referring to (a) of FIG. 6, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, a base station may schedule SL resources to be used by a terminal for SL transmission. For example, in step S600, the base station may transmit information related to SL resources and / or information related to UL resources to a first terminal. For example, the UL resources may include PUCCH resources and / or PUSCH resources. For example, the UL resources may be resources for reporting SL HARQ feedback to the base station.

[0068] 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 that the base station configures / assigns to the first terminal via downlink control information (DCI). In this specification, the CG resources may be (periodic) resources that the base station configures / assigns to the first terminal via DCI and / or RRC messages. For example, in the case of CG type 1 resources, the base station may transmit 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 transmit an RRC message including information related to the CG resources to the first terminal, and the base station may transmit a DCI related to activation or release of the CG resources to the first terminal.

[0069] In step S610, the first terminal may transmit a PSCCH (e.g., Sidelink Control Information (SCI) or 1st-stage SCI) to the 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 the second terminal. In step S630, the first terminal may receive a PSFCH associated with the PSCCH / PSSCH from the 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 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 a DCI for SL scheduling. For example, the format of the DCI may be DCI format 3_0 or DCI format 3_1.

[0070] An example of DCI format 3_0 will be described below.

[0071] DCI format 3_0 is used for scheduling of NR PSCCH and NR PSSCH in one cell.

[0072] The following information is transmitted via DCI format 3_0 with the CRC scrambled by the SL-RNTI or SL-CS-RNTI.

[0073] Resource Pool Index - ceiling(log2I) bits, where I is the number of resource pools for transmission configured by the higher layer parameter sl-TxPoolScheduling.

[0074] - Time gap - 3 bits determined by the higher layer parameter sl-DCI-ToSL-Trans

[0075] - HARQ process number - 4 bits

[0076] -New Data Indicator - 1 bit

[0077] - the lowest index of subchannel allocation for the initial transmission - ceiling(log2(N SL subChannel ))bit

[0078] -SCI format 1-A field: frequency resource allocation, time resource allocation

[0079] -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.

[0080] - PUCCH resource indicator - 3 bits

[0081] - 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.

[0082] 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

[0083] -Padding bits, if needed

[0084] Referring to FIG. 6(b), in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal may 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 may autonomously select or schedule resources for SL transmission. For example, the terminal may self-select resources within a configured resource pool to perform SL communication. For example, the terminal may perform sensing and resource (re)selection procedures and self-select resources within a selection window. For example, the sensing may be performed in units of subchannels. For example, in step S610, the first terminal that self-selects resources within a resource pool may transmit a PSCCH (e.g., SCI (Sidelink Control Information) or 1st-stage SCI) to the second terminal using the resources. In step S620, the first terminal may transmit a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) associated with the PSCCH to the second terminal. In step S630, the first terminal may receive a PSFCH associated with the PSCCH / PSSCH from the second terminal.

[0085] With reference to (a) or (b) of FIG. 6, for example, the first terminal may transmit an SCI to the second terminal on the PSCCH. Alternatively, for example, the first terminal may 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 may 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 may be referred to as the 1st SCI, the first SCI, the 1st-stage SCI, or the 1st-stage SCI format, and the SCI transmitted on the PSSCH may be referred to as the 2nd SCI, the second SCI, the 2nd-stage SCI, or the 2nd-stage SCI format. For example, the 1st-stage SCI format may include SCI format 1-A, and the 2nd-stage SCI format may include SCI format 2-A and / or SCI format 2-B.

[0086] An example of SCI format 1-A will be described below.

[0087] SCI format 1-A is for PSSCH and 2 on PSSCH. nd Used for -stage SCI scheduling.

[0088] The following information is transmitted using SCI Format 1-A.

[0089] - Priority - 3 bits

[0090] -Frequency resource allocation - When the value of the upper layer parameter sl-MaxNumPerReserve is set to 2, ceiling(log2(N SL subChannel (N SL subChannel +1) / 2)) bits, otherwise, if the value of the upper hierarchical parameter sl-MaxNumPerReserve is set to 3, the ceiling log2(N SL subChannel (NSL subChannel +1)(2N SL subChannel +1) / 6) bit

[0091] - 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

[0092] -Resource reservation cycle -ceiling(log2N rsv_period ) bits, where N rsv_period If the upper layer parameter sl-MultiReserveResource is set, the number of entries in the upper layer parameter sl-ResourceReservePeriodList. Otherwise, a 0 bit

[0093] -DMRS pattern -ceiling(log2N pattern ) bits, where N pattern is the number of DMRS patterns set by the upper layer parameter sl-PSSCH-DMRS-TimePatternList.

[0094] -2 nd -stage SCI format - 2 bits as defined in Table 5

[0095] - beta_offset indicator - 2 bits as provided by the higher level parameter sl-BetaOffsets2ndSCI

[0096] Number of DMRS ports - 1 bit as defined in Table 6

[0097] -Modulation and coding method - 5 bits

[0098] Additional MCS table indicator - 1 bit if one MCS table is set by the upper layer parameter sl-Additional-MCS-Table, 2 bits if two MCS tables are set by the upper layer parameter sl-Additional-MCS-Table, 0 bit otherwise

[0099] PSFCH overhead indicator - 1 bit if upper layer parameter sl-PSFCH-Period=2 or 4, 0 bit otherwise

[0100] -Reserved Bits--The number of bits determined by the higher layer parameter sl-NumReservedBits, which is set to 0.

[0101] [Table 5]

[0102] [Table 6]

[0103] An example of SCI format 2-A will be described below.

[0104] In a 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 for decoding the PSSCH.

[0105] The following information is transmitted via SCI Format 2-A:

[0106] - HARQ process number - 4 bits

[0107] -New Data Indicator - 1 bit

[0108] -redundancy version - 2 bits

[0109] -Source ID - 8 bits

[0110] -Destination ID - 16 bits

[0111] HARQ feedback activation / deactivation indicator - 1 bit

[0112] - Cast Type Indicator - 2 bits as defined in Table 7

[0113] -CSI Request - 1 bit

[0114] [Table 7]

[0115] An example of SCI format 2-B will be described below.

[0116] In a HARQ operation, if the HARQ-ACK information only includes a NACK, or if there is no feedback of the HARQ-ACK information, SCI format 2-B is used for decoding the PSSCH.

[0117] The following information is transmitted via SCI Format 2-B:

[0118] - HARQ process number - 4 bits

[0119] -New Data Indicator - 1 bit

[0120] -redundancy version - 2 bits

[0121] -Source ID - 8 bits

[0122] -Destination ID - 16 bits

[0123] HARQ feedback activation / deactivation indicator - 1 bit

[0124] -Zone ID - 12 bits

[0125] - communication range requirements - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0126] 6A or 6B, in step S630, the first terminal may receive a 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.

[0127] 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.

[0128] 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, FIG. 7(a) illustrates broadcast type SL communication, FIG. 7(b) illustrates unicast type SL communication, and FIG. 7(c) illustrates groupcast type SL communication. In the case of unicast type SL communication, a terminal can perform one-to-one communication with another terminal. In the case of groupcast type SL communication, a terminal can perform SL communication with one or more terminals in a group to which the terminal belongs. In various embodiments of the present disclosure, the SL groupcast communication can be replaced with SL multicast communication, SL one-to-many communication, etc.

[0129] The Hybrid Automatic Repeat Request (HARQ) procedure will now be described.

[0130] For example, SL HARQ feedback may be enabled for unicast. In this case, in a non-CBG (non-Code Block Group) operation, if a receiving terminal decodes a PSCCH targeting the receiving terminal and the receiving terminal successfully decodes a transmission block associated with the PSCCH, the receiving terminal may generate a HARQ-ACK. The receiving terminal may then transmit the HARQ-ACK to the transmitting terminal. On the other hand, if the receiving terminal cannot successfully decode a transmission block associated with the PSCCH after the receiving terminal decodes a PSCCH targeting the receiving terminal, the receiving terminal may generate a HARQ-NACK. The receiving terminal may then transmit the HARQ-NACK to the transmitting terminal.

[0131] For example, SL HARQ feedback may be enabled for groupcast. For example, in non-CBG operation, two HARQ feedback options may be supported for groupcast.

[0132] (1) Groupcast Option 1: After a receiving terminal decodes a PSCCH targeted at the receiving terminal, if the receiving terminal fails to decode a transmission block associated with the PSCCH, the receiving terminal may transmit a HARQ-NACK to the transmitting terminal via a PSFCH. On the other hand, if the receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal does not transmit a HARQ-ACK to the transmitting terminal.

[0133] (2) Groupcast Option 2: After a receiving terminal decodes a PSCCH targeted at the receiving terminal, if the receiving terminal fails to decode a transmission block associated with the PSCCH, the receiving terminal can transmit a HARQ-NACK to the transmitting terminal via a PSFCH. And, if the receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal can transmit a HARQ-ACK to the transmitting terminal via a PSFCH.

[0134] For example, when groupcast option 1 is used for SL HARQ feedback, all terminals performing groupcast communication can share the PSFCH resource, e.g., terminals belonging to the same group can use the same PSFCH resource to transmit HARQ feedback.

[0135] For example, when groupcast option 2 is used for SL HARQ feedback, each terminal performing groupcast communication may use different PSFCH resources for transmitting HARQ feedback. For example, terminals belonging to the same group may transmit HARQ feedback using different PSFCH resources.

[0136] In this specification, HARQ-ACK may be referred to as ACK, ACK information, or positive-ACK information, and HARQ-NACK may be referred to as NACK, NACK information, or negative-ACK information.

[0137] The following describes the UE procedure for reporting HARQ-ACK in sidelink.

[0138] The UE shall use N to transmit the PSFCH including the HARQ-ACK information in response to the PSSCH reception. PSSCH subchThe HARQ-ACK information may be indicated by an SCI format that schedules PSSCH reception on one or more subchannels from the subchannels. The UE provides HARQ-ACK information including an ACK or a NACK, or only a NACK.

[0139] The UE can be provided with the number of slots in the resource pool for PSFCH transmission occasion resources by sl-PSFCH-Period-r16. If the number is 0, PSFCH transmission from the UE is disabled in the resource pool. The UE can be provided with the number of slots in the resource pool for PSFCH transmission occasion resources by sl-PSFCH-Period-r16. If the number is 0, PSFCH transmission from the UE is disabled in the resource pool. PSFCH PSSCH = 0, slot t′ k SL (0<=k <T′ max ), where t′ k SL is a slot that belongs to the resource pool, and T′ max is the number of slots in the resource pool within 10240 msec, and N PSFCH PSSCH is provided in sl-PSFCH-Period-r16. The UE can be instructed by higher layers not to transmit a PSFCH in response to a PSSCH reception. If the UE receives a PSSCH in a resource pool and the HARQ feedback enabled / not allowed indicator field included in the associated SCI format 2-A or SCI format 2-B has a value of 1, the UE provides HARQ-ACK information via a PSFCH transmission in the resource pool. The UE transmits a PSFCH in a first slot, where the first slot is the slot after the minimum number of slots provided by sl-MinTimeGapPSFCH-r16 of the resource pool including the PSFCH resource and after the last slot of PSSCH reception.

[0140] The UE determines a set M of PRBs in the resource pool for PSFCH transmission on the PRBs of the resource pool. PSFCH PRB,setThe number of subchannels for the resource pool provided by sl-NumSubchannel is N subch and N PSFCH PSSCH For a smaller or equal number of PSSCH slots associated with a PSFCH slot, the UE PRB,set PSFCH Of the PRBs, [(i+j·N PSFCH PSSCH )·M PSFCH subch,slot , (i+1+j N PSFCH PSSCH )·M PSFCH subch,slot −1] PRB is assigned to slot i and subchannel j of the PSSCH slot associated with the PSFCH slot. Here, M PSFCH subch,slot =M PSFCH PRB,set / (N subch N PSFCH PSSCH ), 0<=i <N PSFCH PSSCH , 0<=j <N subch and the allocation starts with increasing i and continues with increasing j. PSFCH PRB,set N subch N PSFCH PSSCH I expect it to be a multiple of .

[0141] The UE determines the number of PSFCH resources available for multiplexing the HARQ-ACK information included in the PSFCH transmission as R PSFCH PRB,CS =N PSFCH type M PSFCH subch,slot N PSFCH CS Here, N PSFCH CS is the number of cyclic shift pairs for the resource pool, and based on instructions from the upper hierarchy,

[0142] -N PSFCH type= 1 and M PSFCH subch,slot The PRB is associated with the starting subchannel of the corresponding PSSCH.

[0143] -N PSFCH type =N PSSCH subch and N PSSCH subch M PSFCH subch,slot PRB is the N of the corresponding PSSCH. PSSCH subch Associated with one or more of the sub-channels.

[0144] The PSFCH resources are first PSFCH type M PSFCH subch,slot After PRBs are indexed in ascending order of PRB index, N PSFCH CS The cyclic shift pairs are indexed in ascending order of cyclic shift pair index.

[0145] The UE receives the index of the PSFCH resource for PSFCH transmission (P ID +M ID ) mod R PSFCH PRB,CS Here, P ID is the physical layer source ID provided by the SCI format 2-A or 2-B for scheduling PSSCH reception, and M ID is the ID of the UE receiving the PSSCH indicated by the higher layer if the UE detects SCI format 2-A with the cast type indicator field value "01", otherwise, ID is 0.

[0146] The UE shall use Table 8 to determine N PSFCH CS and determine a value of m0 for calculating a cyclic shift α value from a cyclic shift pair index corresponding to the PSFCH resource index.

[0147] [Table 8]

[0148] If the UE detects SCI format 2-A with a cast type indicator field value of '01' or '10', as shown in Table 9, or if the UE detects SCI format 2-B or SCI format 2-A with a cast type indicator field value of '11', as shown in Table 10, the UE shall select a value m for calculating the cyclic shift α value. cs The UE applies one cyclic shift of the cyclic shift pair to the sequence used for PSFCH transmission.

[0149] [Table 9]

[0150] [Table 10]

[0151] On the other hand, NR V2X in Release 16 does not support UE power saving operations. On the other hand, NR V2X in Release 17 and later will support UE power saving operations (e.g., Power Saving UE).

[0152] On the other hand, for the energy saving operation of the UE (e.g., SL DRX operation), it is necessary to define the SL DRX configuration (e.g., SL DRX cycle, SL DRX on-duration timer, SL DRX off-duration timer, SL DRX slot offset (e.g., offset indicating the start point of the SL DRX on-duration timer), SL DRX start offset (e.g., offset indicating the start point of the SL DRX cycle), timers for supporting SL DRX operation, etc.) used by the Power Saving UE (P-UE). Also, it is necessary to define the operation of the transmitting UE (TX) and receiving UE (RX) in the on-duration (e.g., period during which sidelink reception / transmission can be performed) and / or the off-duration (e.g., period during which the UE operates in sleep mode).

[0153] Meanwhile, the Uu DRX operation of Release 16 supports Uu DRX operation linked with UL transmission or DL ​​reception operation between a terminal and a base station. However, the Uu DRX operation of Release 16 does not support Uu DRX operation for NR SL TX and NR SL RX. Therefore, it is necessary to propose a method of Uu DRX operation linked with sidelink transmission and sidelink reception of a UE and a device supporting the same.

[0154] On the other hand, a UE performing SL communication based on resource allocation mode 1 can receive an SL grant from a base station and can perform SL transmission based on the SL grant. On the other hand, for UE power saving, when a Uu DRX configuration and / or a SL DRX configuration is configured for the UE, it is necessary to clearly define a time period during which the UE needs to operate in an active time to receive an SL grant and / or a time period during which the UE is not expected to receive an SL grant.

[0155] 8 illustrates a procedure in which a UE starts a Uu DRX timer based on an SL grant according to one embodiment of the present disclosure. The embodiment of FIG. 8 can be combined with various embodiments of the present disclosure.

[0156] 8, in step S800, a TX UE may acquire a DRX configuration. For example, the DRX configuration may include a Uu DRX configuration and / or a SL DRX configuration. For example, a TX UE may receive the DRX configuration from a base station. For example, the DRX configuration may be configured or preconfigured for the TX UE.

[0157] For example, the Uu DRX configuration may include information related to a drx-HARQ-RTT-TimerSL timer (hereinafter, HARQ RTT timer) and / or information related to a drx-RetransmissionTimerSL timer (hereinafter, retransmission timer). For example, the timers are used for the following purposes:

[0158] (1) drx-HARQ-RTT-TimerSL timer: A period during which a TX UE (a UE 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 a base station.

[0159] For example, drx-HARQ-RTT-TimerSL is operated per SL HARQ process. For example, drx-HARQ-RTT-TimerSL is the minimum duration before a SL retransmission grant is expected by the MAC entity.

[0160] (2) drx-RetransmissionTimerSL timer: a period during which a TX UE (a UE 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 a base station.

[0161] For example, drx-RetransmissionTimerSL is operated for each SL HARQ process. For example, drx-RetransmissionTimerSL is the maximum duration until a grant for SL retransmission is received.

[0162] The SL DRX configuration referred to in this disclosure may include at least one or more of the following parameters / information:

[0163] (1) SL DRX-onDurationTimer: the duration at the beginning of a SL DRX Cycle

[0164] (2) SL DRX-SlotOffset: the delay before starting the SL DRX-on Duration Timer

[0165] (3) SL DRX-InactivityTimer: the duration after the PSCCH occasion in which a PSCCH indicates a new SL transmission for the MAC entity

[0166] (4) (HARQ process or sidelink process) SL DRX-Retransmission Timer: the maximum duration until a retransmission is received

[0167] (5) (HARQ process or sidelink process) SL DRX-HARQ-RTT-Timer: the minimum duration before PSCCH(Sidelink Control Information)&PSSCHf or SL HARQ retransmission is expected by the MAC entity

[0168] (6) SL DRX-LongCycleStartOffset: the Long DRX Cycle and drx-Start Offset which defines the subframe where the Long and Short DRX Cycle starts

[0169] (7) SL DRX-ShortCycle (optional): the Short DRX Cycle

[0170] (8) SL DRX-ShortCycleTimer (optional): the duration the UE shall follow the Short DRX Cycle

[0171] (9) (Sidelink process specific) SL DRX-HARQ-RTT-Timer: the minimum duration before an assignment for HARQ retransmission is expected by the MAC entity

[0172] (10) SL DRX-StartOffset: the subframe where the SL DRX Cycle starts

[0173] (11)SL DRX-Cycle:SL DRX Cycle

[0174] The following SL DRX timers mentioned in this disclosure are used for the following purposes:

[0175] (1) SL DRX on duration timer: A period during which a UE performing SL DRX operation must operate in an active time to receive the PSCCH / PSSCH of a remote UE

[0176] (2) SL DRX inactivity timer: A period that extends the SL DRX on duration period, which is a period during which a UE performing SL DRX operation must basically operate in an active state to receive the PSCCH / PSSCH of a remote UE.

[0177] For example, the UE can extend the SL DRX on-duration timer by the duration of the SL DRX inactivity timer, and if the UE receives a new packet (e.g., a new PSSCH transmission) from the peer UE, the UE can start the SL DRX inactivity timer and extend the SL DRX on-duration timer.

[0178] For example, the SL DRX inactivity timer is used to extend the SL DRX on-duration timer period, which is the period during which a RX UE performing SL DRX operation must basically operate in an active state to receive the PSCCH / PSSCH of the remote TX UE. That is, the SL DRX on-duration timer is extended only for the SL DRX inactivity timer period. Also, if the RX UE receives a new packet (e.g., a new PSSCH transmission) from the remote TX UE, the RX UE can start the SL DRX inactivity timer to extend the SL DRX on-duration timer.

[0179] (3) SL DRX HARQ RTT timer: A period during which a UE performing SL DRX operation operates in sleep mode until it receives a retransmission packet (or a PSSCH assignment) transmitted by a peer UE.

[0180] For example, when a UE starts a SL DRX HARQ RTT timer, the UE can determine that the other UE will not transmit a sidelink retransmission packet to the UE until the SL DRX HARQ RTT timer expires, and can operate in a sleep mode while the timer is running. For example, when a UE starts a SL DRX HARQ RTT timer, the UE does not need to monitor a sidelink retransmission packet from the other UE until the SL DRX HARQ RTT timer expires. For example, when an RX UE receives a PSCCH / PSSCH transmitted by a TX UE and transmits a SL HARQ NACK feedback, the RX UE can start a SL DRX HARQ RTT timer. In this case, the RX UE can determine that the other TX UE will not transmit a sidelink retransmission packet to the UE until the SL DRX HARQ RTT timer expires, and the RX UE can operate in a sleep mode while the timer is running.

[0181] (4) SL DRX retransmission timer: A timer that starts when the SL DRX HARQ RTT timer expires, and a period during which a UE performing a SL DRX operation operates during an active time to receive a retransmission packet (or a PSSCH assignment) transmitted by a peer UE.

[0182] For example, during the timer period, the UE may receive or monitor a retransmission sidelink packet (or PSSCH assignment) transmitted by the counterpart UE. For example, a RX UE may receive or monitor a retransmission sidelink packet (or PSSCH assignment) transmitted by the counterpart TX UE while the SL DRX retransmission timer is running.

[0183] In this disclosure, the names of the timers (Uu DRX HARQ RTT TimerSL, Uu DRX Retransmission TimerSL, Sidelink DRX On Duration Timer, Sidelink DRX Inactivity timer, Sidelink DRX HARQ RTT Timer, Sidelink DRX Retransmission Timer, etc.) are examples, and timers that perform the same / similar functions based on the contents described in each timer are considered to be the same / similar timers regardless of their names.

[0184] In step S810, the TX UE may receive an SL grant from the base station. In this case, it is assumed that a PUCCH resource is not configured for the TX UE. For example, a PUCCH resource related to the SL grant is not configured for the TX UE. For example, whether a PUCCH resource is configured is indicated to the TX UE according to Table 11.

[0185] [Table 11]

[0186] In step S820, the TX UE may start a Uu DRX timer. For example, based on that a PUCCH resource for SL HARQ feedback report is not configured for the TX UE, the TX UE may determine a time to start the Uu DRX timer. For example, the TX UE may start a HARQ RTT timer at the determined time. Then, when the HARQ RTT timer expires, the TX UE may start a retransmission timer.

[0187] Hereinafter, the Uu DRX operation when the PUCCH is not configured will be described in detail.

[0188] According to an embodiment of the present disclosure, the operation (e.g., start) and / or parameter value of a Uu DRX timer (e.g., HARQ RTT timer, retransmission timer) for MODE 1 DCI monitoring is configured to be different depending on whether a MODE 1 SL grant is allocated / scheduled on a pool in which a PSFCH resource is configured. For example, the operation (e.g., start) and / or parameter value of a Uu DRX timer (e.g., HARQ RTT timer, retransmission timer) for MODE 1 DCI monitoring is configured to be different depending on whether a PSFCH resource is configured in a MODE 1 SL grant. For example, the operation (e.g., start) and / or parameter value of a Uu DRX timer (e.g., HARQ RTT timer, retransmission timer) for MODE 1 DCI monitoring is configured to be different depending on whether a PSFCH resource (satisfying a required (minimum) time gap) exists between MODE 1 SL grant-related resources.

[0189] Specifically, for example, in the case of a MODE 1 SL grant allocated / scheduled on a pool with a PSFCH resource configured and / or a MODE 1 SL grant with a PSFCH configured, the UE is configured to (always) start a MODE 1 DCI monitoring related Uu DRX timer (e.g., HARQ RTT timer) and / or a Uu retransmission timer based on the time of the PSFCH resource (regardless of whether a HARQ feedback ENABLED / DISABLED MAC PDU is actually transmitted via the MODE 1 SL grant). Otherwise, the UE is configured to (always) start a MODE 1 DCI monitoring related Uu DRX timer (e.g., HARQ RTT timer) and / or a Uu retransmission timer based on a MODE 1 SL grant related resource of a pre-configured position / order (regardless of whether a HARQ feedback ENABLED / DISABLED MAC PDU is actually transmitted via the MODE 1 SL grant). For example, the MODE 1 SL grant related resource is a resource (ie, a PDCCH resource) on which the MODE 1 SL grant is received.

[0190] 9 illustrates a method for a UE to start a MODE 1 DCI monitoring related Uu DRX timer based on a MODE 1 SL grant related resource when a PUCCH resource is not configured according to one embodiment of the present disclosure. The embodiment of FIG. 9 can be combined with various embodiments of the present disclosure.

[0191] Referring to FIG. 9, the UE may receive a MODE 1 SL grant from the base station. Then, the UE may start a HARQ RTT timer at the first symbol after the end of the MODE 1 SL grant related resource (i.e., PDCCH resource). In this case, while the HARQ RTT timer is running, the UE may expect / determine that the SL retransmission grant related to the HARQ process associated with the HARQ RTT timer is not transmitted by the base station. Furthermore, the UE may perform PSCCH / PSSCH transmission based on the MODE 1 SL grant. Then, when the HARQ RTT timer expires, the UE may start a retransmission timer, and the UE may monitor the MODE 1 SL grant transmitted by the base station. If the UE receives a MODE 1 SL grant from the base station, the UE may start a HARQ RTT timer at the first symbol after the end of the MODE 1 SL grant related resource (i.e., PDCCH resource).

[0192] According to an embodiment of the present disclosure, if SL PUCCH configuration is not configured for the UE, SL DRX operation needs to be defined differently according to the SL HARQ feedback mode. That is, when transmitting a HARQ feedback enabled MAC PDU, the TX UE may start the drx-HARQ-RTT-TimerSL for the HARQ process ID at the first symbol after the end of the PSFCH reception carrying the SL HARQ feedback (i.e., NACK). Also, when transmitting a HARQ feedback disabled MAC PDU, the TX UE may start the drx-HARQ-RTT-TimerSL or drx-RetransmissionTimerSL for the HARQ process ID at the first symbol after the end of the last (or first) transmission (in a bundle) of the PSSCH transmission.

[0193] For example, if a SL PUCCH configuration is not configured for a UE, then drx-HARQ-RTT-TimerSL is supported for the UE when transmitting a HARQ feedback disabled MAC PDU. For example, if a SL PUCCH configuration is not configured for a UE, then drx-HARQ-RTT-TimerSL is not supported for the UE when transmitting a HARQ feedback disabled MAC PDU.

[0194] For example, if a SL PUCCH configuration is not configured for a UE, the SL DRX operation is defined differently depending on the SL HARQ feedback mode.

[0195] For example, if SL PUCCH configuration is not configured for a UE, when transmitting a HARQ feedback enabled MAC PDU, the TX UE may start the drx-HARQ-RTT-TimerSL for the HARQ process ID at the first symbol after the end of reception of the PSFCH carrying the SL HARQ feedback (i.e., NACK).

[0196] For example, if no SL PUCCH configuration is configured for a UE, when transmitting a HARQ feedback enabled MAC PDU using only a HARQ feedback enabled LCH and a mapped SL CG grant, the TX UE may start the drx-HARQ-RTT-TimerSL for the HARQ process ID at the first symbol after the end of reception of the PSFCH carrying the SL HARQ feedback (i.e., NACK).

[0197] For example, if SL PUCCH configuration is not configured for a UE, when transmitting a MAC PDU with HARQ feedback disabled, the TX UE may start the drx-HARQ-RTT-TimerSL or drx-RetransmissionTimerSL for the HARQ process ID at the first symbol after the end of the last (or first) transmission (in the bundle) of the PSSCH transmission.

[0198] For example, if no SL PUCCH configuration is configured for a UE, when transmitting a HARQ feedback disabled MAC PDU using only a HARQ feedback disabled LCH and a mapped SL CG grant, the TX UE may start the drx-HARQ-RTT-TimerSL or drx-RetransmissionTimerSL for the HARQ process ID at the first symbol after the last transmission (within the bundle) of the PSSCH transmission ends.

[0199] In step S830, the TX UE may send the second SCI and the first SCI for scheduling the PSSCH to the RX UE via the PSCCH based on the SL grant.

[0200] In step S840, the TX UE receives the SL grant and PSSCH The second SCI and MAC PDU may be sent to the RX UE via the second SCI and MAC PDU.

[0201] In step S850, the TX UE may receive an SL grant from the base station. For example, when the HARQ RTT timer started in step S820 expires and the retransmission timer is running, the TX UE may monitor the SL grant sent by the base station, and the TX UE may receive the SL grant from the base station. In this case, if the PUCCH resource related to the SL grant is not configured for the TX UE, the TX UE may determine a start time of the Uu DRX timer based on the method proposed in this disclosure, and in step S860, the TX UE may start the Uu DRX timer at the determined start time.

[0202] 10 illustrates a case where a UE starts a HARQ RTT timer based on a SL resource that is not a PDCCH resource. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure.

[0203] Referring to FIG. 10, it is assumed that the UE starts the HARQ RTT timer based on the PSSCH / PSCCH resource. In this case, the UE needs to perform monitoring for the SL grant even though the SL grant is not transmitted by the base station during the T1 period, which may cause the UE to consume unnecessary power. In addition, the base station may not be able to allocate the SL grant to the UE during the T2 period when the HARQ RTT timer is running. That is, even if the base station has an allocatable SL resource during the T2 period, the base station may not be able to allocate the SL grant to the UE because the UE's HARQ RTT timer is running. As a result, the UE's SL transmission is delayed, and the reliability of the SL transmission, which requires low latency, may not be corrected. Furthermore, the flexibility of the base station's SL resource allocation may be unduly limited.

[0204] On the other hand, according to various embodiments of the present disclosure, the UE can omit monitoring the SL grant immediately after receiving the SL grant during the time when the SL grant is not expected to be transmitted from the base station. This can reduce the power consumption of the UE. Furthermore, when the PUCCH resource is not configured for the UE, the UE can start the HARQ RTT timer based on the PDCCH resource, thereby obtaining the power saving gain of the UE and at the same time ensuring the reliability of the SL communication that requires low latency.

[0205] According to one embodiment of the present disclosure, the SL HARQ RTT timer is derived at the retransmission resource timing when the SCI indicates a retransmission resource, and an explicitly configured SL HARQ RTT timer may still be required.

[0206] On the other hand, the SL DRX operation based on the above assumption may not operate correctly. When the transmission pools of UEs performing sidelink transmission and reception are different, a problem may occur in which the RX UE cannot correctly derive the next transmission resource information included in the SCI transmitted by the TX UE.

[0207] 11 is a diagram illustrating a problem that a RX UE cannot correctly derive next transmission resource information included in an SCI transmitted by a TX UE when the transmission pools of UEs performing sidelink transmission and reception are different. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure.

[0208] For example, referring to FIG. 11, UE1 / 2 use physical slot indexes 1, 3, 5, 7, 9, 11, 13, 15... for the transmission pool, and UE3 uses physical slot indexes 2, 6, 10, 14... for the transmission pool. UE1 uses physical slot indexes 1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 15... including all transmission pools of UE1 / 2 / 3 for the reception pool. At this time, UE1 confirms that the TRIV (i.e., Time Resource Indicator Value) included in the SCI transmitted by UE2 is displayed as 2, and monitors the reception of the next SCI at reception pool index 4. Since UE1 uses the same transmission pool as UE2, the resource information included in the SCI is accurately derived by UE1. However, a problem occurs if UE1 uses a different transmission pool from UE3. For example, if UE1 receives the SCI transmitted by UE3 and confirms that TRIV is displayed as 3, the location of the receiving pool is calculated based on its own receiving pool (e.g., because UE3's transmitting pool is different from UE1's transmitting pool). That is, UE1 determines that UE3 will transmit the next SCI at physical slot index 6 (UE1's receiving pool "5") and performs UE3's SCI monitoring operation at that point. However, UE3's next SCI transmission point is at physical slot index 14 (UE1's receiving pool "11"). Therefore, if different transmission pools are used between UEs, the next resource information included in the SCI may be misinterpreted, and a problem may occur when performing SL DRX operation based on the next resource information included in the SCI.

[0209] To solve this problem, the transmit and receive pools of two UEs performing SL TX / RX can all be aligned. In order to ensure that the SL DRX timer operation based on SCI information is guaranteed without the mentioned limitations, the following operations can be considered.

[0210] In one method, the SCI can provide transmission pool index information to be used for its transmission, and the linkage between the indexes of the transmission pools (of different gNBs) is set (at a time point). That is, the TX UE can provide the transmission pool information to be used by the TX UE to the RX UE.

[0211] Alternatively, a mechanism may be considered that allows sleep only in slots in the receive pool where misalignment occurs, such as m.

[0212] -(value specified by TRIV in SCI - 1) * (length of SL slot)

[0213] -Physical slot (value indicated by TRIV in SCI - 1)

[0214] - SL slots belonging to the receive pool (value indicated by TRIV in SCI minus 1)

[0215] Or the next resource time information can be specified as an absolute time in the SCI and notified to the RX UE, which can further use the absolute time information to infer the approximate next resource information point.

[0216] For example, if UEs performing SL transmission and reception use different transmission pools, the RX UE may not be able to correctly derive the next resource information included in the SCI transmitted by the TX UE.

[0217] For example, in order for the RX UE to correctly derive the next resource information from the SCI, it may be necessary to align resource pools between UEs. In order to operate correctly without such constraints, connection information between indexes of different resource pools can be provided.

[0218] For example, instead of a mechanism in which the SL DRX HARQ RTT timer value is directly derived on the TRIV value of the SCI, a mechanism in which the SL DRX HARQ RTT timer value is derived by a predefined function based on the TRIV value on the SCI is considered.

[0219] For example, the SCI includes 1 to 2 pieces of next resource information. Under the above assumption, additional discussion and verification is required as to whether the SL DRX HARQ RTT / retransmission timer is set considering only the first next resource information or only the second next resource information. For example, to avoid unnecessary power consumption at the RX UE side, if the RX UE fails to decode the SCI in the second resource (indicated by the previous SCI received in the first resource), the SL DRX retransmission timer is driven from the second resource onwards and up to the third resource (indicated by the previous SCI received in the first resource).

[0220] If a resource reserved in a previous SCI is reselected due to preemption, it may affect the SL DRX operation. For example, if the TX UE reselects a resource at a time earlier than the resource indicated by the previous SCI for resource reselection due to preemption, the RX UE may not be able to receive the transmission of the TX UE when the RX UE wakes up after the resource indicated by the SCI. Also, if the TX UE performs resource reselection after the resource indicated by the SCI, there may be a problem of not being able to satisfy the PDB of the SL data. One possible solution to solve this problem is for the TX UE to instruct the RX UE via the SCI not to perform a sleep operation if the remaining selection window is short or the remaining PDB is short.

[0221] For example, SL DRX operation based on resource information included in the SCI may affect the resource selection procedure mentioned above.

[0222] According to an embodiment of the present disclosure, the RX UE may not be able to receive the SCI on the resource indicated by the previous SCI of the TX UE. Therefore, when the TX UE reselects the resource indicated by the previous SCI, it needs to consider whether the RX UE can properly receive the data of the TX UE in the time domain in which the RX UE needs to perform the resource reselection of the TX UE. For example, when the TX UE performs the reselection of the resource reserved by the previous SCI, the RX UE may not be able to receive the SCI on the resource indicated by the previous SCI of the TX UE. Therefore, it needs to consider whether the RX UE can properly receive the data of the TX UE in the time domain in which the TX UE performs the resource reselection.

[0223] For example, the TX UE may start a SL DRX retransmission timer (e.g., a timer in the TX UE to synchronize with the timer in the RX UE) based on the most recently received NACK, and the preemption-based resource reselection is performed while the SL DRX retransmission timer in the RX UE is running.

[0224] According to an embodiment of the present disclosure, the TX UE and the RX UE may perform additional power saving operations based on the PSFCH reception and transmission. The TX UE may operate in a sidelink DRX sleep mode from the time of transmitting the PSCCH / PSSCH to the time of receiving the PSFCH to reduce power consumption. Also, the TX UE may wake up at the time of receiving the PSFCH to monitor the PSFCH transmitted by the RX UE. The RX UE may perform a sleep operation related to the SL HARQ process in the time interval between the initial PSSCH reception and the time of transmitting the PSFCH to reduce additional power consumption. Also, the RX UE may perform a sleep mode operation related to the SL HARQ process in the time interval between the time of transmitting the PSFCH and the time of receiving the PSSCH retransmission to reduce additional power consumption.

[0225] For example, a TX UE can reduce power consumption by operating in a sidelink DRX sleep mode from the time of PSCCH / PSSCH transmission to the time of PSFCH reception, and a RX UE can reduce additional power consumption by performing a sleep operation associated with a SL HARQ process in the time interval between the initial PSSCH reception and the time of PSFCH transmission.

[0226] For example, unicast specific SL DRX configuration is configured per source / destination ID pair. For example, when configuring UE specific SL DRX configuration, unicast characteristics (e.g., PQI, etc.) and parameters are considered. For example, UE specific SL DRX configuration for SL unicast is configured per PC5 unicast connection (e.g., source ID / destination ID pair) taking into account the QoS class (e.g., PQI) associated with a specific PC5 unicast link (or PC5 RRC). UE specific SL DRX configuration needs to be configured taking into account the QoS class (e.g., PQI) of SL data served via a specific unicast link.

[0227] For example, a UE-specific SL DRX configuration may be configured taking into account the QoS class (eg, PQI) of the SL data served over a particular unicast link.

[0228] For example, UE specific SL DRX configuration for SL unicast needs to be configured taking into account the PC5 RRC connection specific QoS class (e.g. PQI) (e.g. direction of source Layer 2 ID / destination Layer 2 ID pair).

[0229] Meanwhile, the RX UE that receives the SCI transmitted by the TX UE can perform power saving operation by referring to the next resource information included in the SCI. For example, if the RX UE normally receives and successfully decodes the SCI, the RX UE can operate in a sleep state (or in a state where it does not need to monitor the PSCCH / PSSCH of the TX UE) until the next transmission resource point included in the SCI. Or, if the RX UE fails to receive the SCI at the transmission resource position specified in the previous SCI, the RX UE can wake up until the next transmission resource point indicated in the SCI (to monitor the PSCCH / PSSCH transmitted by the TX UE).

[0230] However, as in the embodiment of FIG. 11, due to a problem of resource pool asynchronousity, a problem may occur in which the RX UE misinterprets the next resource information specified by the TX UE in the SCI, and the SL DRX operation cannot be normally performed.

[0231] For example, if the transmission pool of "A" UE and the transmission pool of "B" UE are different from each other and the reception pool includes both the transmission pools (superset), the "B" UE cannot accurately derive the next resource information (time / frequency point) indicated in the SCI transmitted by the "A" UE. That is, for this reason (because the RX UE can derive the next resource information (time / frequency) specified by the TX UE differently), the RX UE supporting the SL DRX operation cannot normally perform the SL DRX operation based on the next resource information of the SCI transmitted by the TX UE.

[0232] Specifically, for example, UE1 / 2 use resource pool indexes 1, 3, 5, 7, 9, 11, 13, 16... for the transmission pool, and UE3 uses resource pool indexes 2, 6, 10, 14... for the transmission pool. UE1 uses resource pool indexes 1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 15... for the reception pool, which includes all the transmission pools of UE1 / 2 / 3. At this time, if UE1 confirms that the TRIV (time-frequency information for the next transmission resource) included in the SCI transmitted by UE2 is indicated as 2, UE1 monitors the next SCI reception at reception pool index 4 (by interpreting the TRIV based on the slot of the transmission pool). UE1 can correctly derive the transmission resource information included in the SCI because it uses the same transmission pool as UE2. However, a problem occurs if UE1 uses a different transmission pool from UE3. For example, if UE1 receives an SCI transmitted by UE3 and confirms that the TRIV (time / frequency information for the next transmission resource) is set to 3, UE1 interprets the TRIV based on its own reception pool. That is, UE1 determines that UE3 will transmit the next SCI at resource pool index 6 (UE1 reception pool "5") and performs an SCI monitoring operation for UE3 at that point. However, the actual next SCI transmission resource point for UE3 is resource pool index 14 (UE1 reception pool "11").

[0233] Therefore, when different transmission pools are used between UEs, there is a possibility that the transmission resource information included in the SCI may be misinterpreted, which may cause problems when performing SL DRX operations based on the transmission resource information base included in the SCI (e.g., awake and sleep operations based on the next transmission resource information base included in the SCI, or setting the timer values ​​(SL DRX HARQ RTT Timer, SL DRX Retransmission Timer, SL DRX Inactivity timer) based on the next transmission resource information base included in the SCI).

[0234] In this disclosure, the following operation is proposed to solve the above-mentioned problems.

[0235] For example, a UE (TX UE and / or RX UE) can transmit / signal information on a resource pool (resource pool information used by the UE) and resource pool utilization / modification information to a counterpart UE (RX UE and / or TX UE). For example, the information is used to make a UE that has transmitted resource pool information change the resource pool information again when the UE confirms the resource pool information (e.g., resource pool index) transmitted by the counterpart UE and the resource pool information does not match its own resource pool information. For example, a UE can transmit utilization information to apply a resource pool "+1". The UE can transmit the proposed resource pool information to be used and resource pool utilization / modification information to the UE, but the UE that receives the resource pool information and resource pool utilization / modification information transmitted by the serving base station of the UE to the UE from the base station can also transmit the information to the counterpart peer UE.

[0236] For example, it is assumed that "A" UE uses resource pool index "1" in the transmission pool and "B" UE uses resource pool index "2" in the transmission pool. Also, it is assumed that "B" UE uses a resource pool including both resource pool indexes "1" and "2" in the reception pool. In this case, "A" UE can transmit resource pool information (e.g., resource pool index "1") used by "A" UE to "B" UE. For example, the information is transmitted via SCI and / or PC5 RRC message. "B" UE can determine that its own transmission pool (resource pool index 2) and the transmission pool (resource pool index 1) used by "A" UE are different, and it may misinterpret the transmission resource information included in the SCI transmitted by "A" UE. In this case, "B" UE can instruct "A" UE (via SCI / MAC CE / PC5 RRC message) to include the next transmission resource information in the SCI using a transmission pool corresponding to resource pool index "2" (apply +1 or directly inform value "2") other than resource pool index "1" when using the transmission pool.

[0237] Through the proposed method, the RX UE can synchronize the transmission pool of the TX UE with the transmission pool it uses, and correctly interpret the transmission resource information included in the SCI transmitted by the TX UE. Thus, the RX UE can perform SL DRX operation by accurately referring to the transmission resource information included in the SCI.

[0238] In addition, in different embodiments, the serving base station may signal / transmit to its own terminal resource pool (location) information configured by different base stations (e.g., including this in one candidate resource pool configured by the serving base station for its own terminal) and / or index mapping / linkage information between resource pools of different base stations.

[0239] Various embodiments of the present disclosure are applicable when a UE receives an SCI from a counterpart UE at the end of an SL active time (e.g., a period during which the UE monitors an SL channel or signal) and the next transmission resource reserved via the SCI received in the active time is in an SL inactive time (e.g., a period during which the UE does not need to monitor an SL channel or signal, or a period during which the UE can operate in a power saving mode). Also, various embodiments of the present disclosure are equally applicable to the SL active time period and the SL inactive time period of the UE.

[0240] The proposal of the present disclosure can be applied and extended to a bill to solve the problem of loss caused by interruption when switching Uu BWP. In addition, the proposal of the present disclosure can be applied and extended to a bill to solve the problem of loss caused by interruption when switching SL BWP when multiple SL BWPs are supported for a terminal.

[0241] The proposal of the present disclosure is extended to not only the default / common SL DRX configuration, the default / common SL DRX pattern, or parameters (e.g., timers) included in the default / common SL DRX configuration, but also the UE-pair specific SL DRX configuration, the UE-pair specific SL DRX pattern, or parameters (e.g., timers) included in the UE-pair specific SL DRX configuration. In addition, the on-duration mentioned in the proposal of the present disclosure can be extended to an active time (e.g., a time during which the UE operates in a wake-up state (e.g., an RF module is on) to receive / transmit a radio signal), and the off-duration can be extended to a sleep time (e.g., a time during which the UE operates in a sleep mode state (e.g., an RF module is off) for energy saving). This does not mean that the TX UE must operate in a sleep mode during the sleep time period. If necessary, the TX UE is allowed to operate in an active time for a while for a sensing operation and / or a transmission operation even during the sleep time.

[0242] For example, the applicability and / or related parameters (e.g., thresholds) of the method / rules proposed (partially) in the present disclosure are set to be specific to a resource pool (or different or independent). For example, the applicability and / or related parameters (e.g., thresholds) of the method / rules proposed (partially) in the present disclosure are set to be specific to a congestion level (or different or independent). For example, the applicability and / or related parameters (e.g., thresholds) of the method / rules proposed (partially) in the present disclosure are set to be specific to a service priority (or different or independent). For example, the applicability and / or related parameters (e.g., thresholds) of the method / rules proposed (partially) in the present disclosure are set to be specific to a service type (or different or independent). For example, the applicability and / or related parameters (e.g., thresholds) of the method / rules proposed (partially) in the present disclosure are set to be specific to a QoS requirement (e.g., latency, reliability) (or different or independent). For example, whether or not to apply the method / rules proposed (in part) of the present disclosure and / or related parameters (e.g., thresholds) are set specific to (or different from or independently of) the PQI (5QI (5G QoS identifier) ​​for PC5). For example, whether or not to apply the method / rules proposed (in part) of the present disclosure and / or related parameters (e.g., thresholds) are set specific to (or different from or independently of) the traffic type (e.g., periodic generation or non-periodic generation). For example, whether or not to apply the method / rules proposed (in part) of the present disclosure and / or related parameters (e.g., thresholds) are set specific to (or different from or independently of) the SL transmission resource allocation mode (e.g., mode 1 or mode 2).

[0243] For example, the applicability of the proposed rule of the present disclosure and / or the related parameter setting value are set to be specific to a resource pool (or differently or independently). For example, the applicability of the proposed rule of the present disclosure and / or the related parameter setting value are set to be specific to a service / packet type (or differently or independently). For example, the applicability of the proposed rule of the present disclosure and / or the related parameter setting value are set to be specific to a service / packet priority (or differently or independently). For example, the applicability of the proposed rule of the present disclosure and / or the related parameter setting value are set to be specific to a QoS requirement (e.g., URLLC / EMBB traffic, reliability, latency). For example, the applicability of the proposed rule of the present disclosure and / or the related parameter setting value are set to be specific to a PQI (or differently or independently). For example, the applicability of the proposed rule of the present disclosure and / or the related parameter setting value are set to be specific to a cast type (e.g., unicast, groupcast, broadcast) (or differently or independently). For example, whether or not the proposed rules of the present disclosure are applied and / or the related parameter setting values ​​are set specific to (resource pool) congestion level (e.g., CBR) (or differently or independently). For example, whether or not the proposed rules of the present disclosure are applied and / or the related parameter setting values ​​are set specific to (or differently or independently) SL HARQ feedback method (e.g., NACK-only feedback, ACK / NACK feedback). For example, whether or not the proposed rules of the present disclosure are applied and / or the related parameter setting values ​​are set specific to (or differently or independently) HARQ Feedback Enabled MAC PDU transmission. For example, whether or not the proposed rules of the present disclosure are applied and / or the related parameter setting values ​​are set specific to (or differently or independently) HARQ Feedback DISABLED MAC PDU transmission. For example, whether or not the proposed rules of the present disclosure are applied and / or the related parameter setting values ​​are set specific to (or differently or independently) whether PUCCH-based SL HARQ feedback reporting operation is configured.For example, the applicability of the proposed rules of the present disclosure and / or the associated parameter setting values ​​are set specific to (or different from or independent of) pre-emption or pre-emption-based resource reselection. For example, the applicability of the proposed rules of the present disclosure and / or the associated parameter setting values ​​are set specific to (or different from or independent of) re-evaluation or re-evaluation-based resource reselection. For example, the applicability of the proposed rules of the present disclosure and / or the associated parameter setting values ​​are set specific to (or different from or independent of) (L2 or L1) (source and / or destination) identifiers. For example, the applicability of the proposed rules of the present disclosure and / or the associated parameter setting values ​​are set specific to (or different from or independent of) (L2 or L1) (combination of source ID and destination ID) identifiers. For example, the applicability of the proposed rules of the present disclosure and / or the related parameter setting values ​​are set to be specific (or different or independent) to an identifier (L2 or L1) (combination of a pair of source ID and destination ID and cast type). For example, the applicability of the proposed rules of the present disclosure and / or the related parameter setting values ​​are set to be specific (or different or independent) to a direction of a pair of source layer ID and destination layer ID. For example, the applicability of the proposed rules of the present disclosure and / or the related parameter setting values ​​are set to be specific (or different or independent) to a PC5 RRC connection / link. For example, the applicability of the proposed rules of the present disclosure and / or the related parameter setting values ​​are set to be specific (or different or independent) to a case where SL DRX is performed. For example, the applicability of the proposed rules of the present disclosure and / or the related parameter setting values ​​are set to be specific (or different or independent) to a SL mode type (e.g., resource allocation mode 1 or resource allocation mode 2). For example, applicability of the proposed rules of the present disclosure and / or related parameter settings may be set specifically (or differently or independently) for the case where (non-)periodic resource reservation is performed.

[0244] The certain time mentioned in the proposal of the present disclosure may refer to a time during which a UE operates in an active time for a predefined time to receive a sidelink signal or sidelink data from a counterpart UE. The certain time mentioned in the proposal of the present disclosure may refer to a time during which a UE operates in an active time for a specific timer (e.g., a Sidelink DRX Retransmission Timer, a Sidelink DRX Inactivity timer, or a timer that ensures that a RX UE can operate in an active time in DRX operation) to receive a sidelink signal or sidelink data from a counterpart UE. In addition, the applicability (and / or related parameter setting values) of the proposal and the proposed rules of the present disclosure also apply to mm Wave SL operation.

[0245] 12 illustrates a method for a first 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.

[0246] Referring to FIG. 12, in step S1210, the first device may acquire a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer. In step S1220, the first device may receive downlink control information (DCI) including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource from a base station based on a physical downlink control channel (PDCCH) resource. In step S1230, the first device may start the HARQ RTT timer after a time domain of the PDCCH resource based on the PUCCH resource not being configured for the first device. For example, the HARQ RTT timer is a minimum duration before a retransmission grant is expected by the first device.

[0247] For example, based on the information related to the PUCCH resource being zero, the PUCCH resource is not configured for the first device.

[0248] For example, the HARQ RTT timer starts at the first symbol after the end of the PDCCH resource.

[0249] For example, the at least one SL resource is associated with the PUCCH resource.

[0250] For example, the DCI may include an index of a resource pool, for example, based on the period of a physical sidelink feedback channel (PSFCH) resource configured for the resource pool being zero, the HARQ RTT timer is started after the time domain of the PDCCH resource.

[0251] Further, for example, the first device may start a retransmission timer after the HARQ RTT timer expires. For example, the retransmission timer is a maximum duration until the retransmission grant is received. For example, the retransmission grant is a DCI including information related to at least one SL resource allocated by the base station for SL retransmission of the first device. For example, the HARQ RTT timer and the retransmission timer are timers set for each HARQ process between the first device and the base station.

[0252] For example, the DCI is a DCI that is cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (SL-RNTI).

[0253] For example, the DCI is a DCI that is CRC (cyclic redundancy check) scrambled by a SL-CS (configured scheduling)-RNTI (radio network temporary identifier).

[0254] Further, for example, the first device can transmit a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second sidelink control information (SCI) to a second device via a physical sidelink control channel (PSCCH) based on the at least one SL resource. Further, for example, the first device can transmit the second SCI or a medium access control protocol data unit (MAC PDU) to the second device via the PSSCH based on the at least one SL resource.

[0255] For example, the HARQ RTT timer starts after the time domain of the PDCCH resources, regardless of whether a physical sidelink feedback channel (PSFCH) resource is configured for a resource pool.

[0256] The proposed method is applied to devices according to various embodiments of the present disclosure. First, the processor 102 of the first device 100 may acquire a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer. Then, the processor 102 of the first device 100 may control the transceiver 106 to receive downlink control information (DCI) from a base station, including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource, based on a physical downlink control channel (PDCCH) resource. Then, the processor 102 of the first device 100 may start the HARQ RTT timer after a time domain of the PDCCH resource, based on the PUCCH resource not being configured for the first device. For example, the HARQ RTT timer is a minimum duration before a retransmission grant is expected by the first device.

[0257] According to an embodiment of the present disclosure, a first device configured to perform wireless communication is provided. For example, the first device may include one or more memories 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 obtain a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer, receive downlink control information (DCI) from a base station including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource based on a physical downlink control channel (PDCCH) resource, and start the HARQ RTT timer after a time domain of the PDCCH resource based on the PUCCH resource being not configured for the first device. For example, the HARQ RTT timer is a minimum duration before a retransmission grant is expected by the first device.

[0258] According to an embodiment of the present disclosure, an apparatus configured to control a first terminal is provided. For example, the apparatus may include one or more processors and one or more memories connected to be executed by the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to obtain a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer, receive downlink control information (DCI) from a base station including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource based on a physical downlink control channel (PDCCH) resource, and start the HARQ RTT timer after a time domain of the PDCCH resource based on the PUCCH resource being not configured for the first terminal. For example, the HARQ RTT timer is a minimum duration before a retransmission grant is expected by the first terminal.

[0259] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium having instructions recorded thereon is provided. For example, the instructions, when executed, may cause a first device to acquire a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer, receive downlink control information (DCI) from a base station including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource based on a physical downlink control channel (PDCCH) resource, and start the HARQ RTT timer after a time domain of the PDCCH resource based on the PUCCH resource being not configured for the first device. For example, the HARQ RTT timer is a minimum duration before a retransmission grant is expected by the first device.

[0260] 13 illustrates a method for a base station to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 13 can be combined with various embodiments of the present disclosure.

[0261] Referring to FIG. 13, in step S1310, the base station may transmit a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer to the first device. In step S1320, the base station may transmit downlink control information (DCI) including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource to the first device based on a physical downlink control channel (PDCCH) resource. For example, based on the PUCCH resource not being configured for the first device, the HARQ RTT timer may be started by the first device after a time domain of the PDCCH resource, and the HARQ RTT timer is a minimum duration before a retransmission grant is expected by the first device.

[0262] For example, based on the information related to the PUCCH resource being zero, the PUCCH resource is not configured for the first device.

[0263] For example, the HARQ RTT timer starts at the first symbol after the end of the PDCCH resource.

[0264] For example, the at least one SL resource is associated with the PUCCH resource.

[0265] For example, the DCI may include an index of a resource pool, for example, based on the period of a physical sidelink feedback channel (PSFCH) resource configured for the resource pool being zero, the HARQ RTT timer is started after the time domain of the PDCCH resource.

[0266] Further, for example, the first device may start a retransmission timer after the HARQ RTT timer expires. For example, the retransmission timer is a maximum duration until the retransmission grant is received. For example, the retransmission grant is a DCI including information related to at least one SL resource allocated by the base station for SL retransmission of the first device. For example, the HARQ RTT timer and the retransmission timer are timers set for each HARQ process between the first device and the base station.

[0267] For example, the DCI is a DCI that is cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (SL-RNTI).

[0268] For example, the DCI is a DCI that is CRC (cyclic redundancy check) scrambled by a SL-CS (configured scheduling)-RNTI (radio network temporary identifier).

[0269] Further, for example, the first device can transmit a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second sidelink control information (SCI) to a second device via a physical sidelink control channel (PSCCH) based on the at least one SL resource. Further, for example, the first device can transmit the second SCI or a medium access control protocol data unit (MAC PDU) to the second device via the PSSCH based on the at least one SL resource.

[0270] For example, the HARQ RTT timer starts after the time domain of the PDCCH resources, regardless of whether a physical sidelink feedback channel (PSFCH) resource is configured for a resource pool.

[0271] The proposed method is applied to devices according to various embodiments of the present disclosure. First, the processor 202 of the base station 200 can control the transceiver 206 to transmit a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer to the first device. Then, the processor 202 of the base station 200 can control the transceiver 206 to transmit downlink control information (DCI) including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource to the first device based on a physical downlink control channel (PDCCH) resource. For example, based on the PUCCH resource not being configured for the first device, the HARQ RTT timer can be started by the first device after a time domain of the PDCCH resource, and the HARQ RTT timer is a minimum duration before a retransmission grant is expected by the first device.

[0272] According to an embodiment of the present disclosure, a base station configured to perform wireless communication is provided. For example, the base station may include one or more memories 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 transmit a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer to a first device, and transmit downlink control information (DCI) including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource to the first device based on a physical downlink control channel (PDCCH) resource. For example, based on the PUCCH resource not being configured for the first device, the HARQ RTT timer may be started by the first device after a time domain of the PDCCH resource, and the HARQ RTT timer is a minimum duration before a retransmission grant is expected by the first device.

[0273] According to an embodiment of the present disclosure, an apparatus configured to control a base station is provided. For example, the apparatus may include one or more processors and one or more memories connected to be executable by the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to transmit a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer to a first terminal, and transmit downlink control information (DCI) including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource to the first terminal based on a physical downlink control channel (PDCCH) resource. For example, based on the PUCCH resource not being configured for the first terminal, the HARQ RTT timer may be started by the first terminal after a time domain of the PDCCH resource, and the HARQ RTT timer is a minimum duration before a retransmission grant is expected by the first terminal.

[0274] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium having instructions recorded thereon is provided. For example, the instructions, when executed, may cause a base station to transmit a discontinuous reception (DRX) configuration to a first device, the DRX configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer, and transmit downlink control information (DCI) to the first device, the DCI including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource based on a physical downlink control channel (PDCCH) resource. For example, based on the PUCCH resource not being configured for the first device, the HARQ RTT timer may be started by the first device after a time domain of the PDCCH resource, the HARQ RTT timer being a minimum duration before a retransmission grant is expected by the first device.

[0275] The various embodiments of the present disclosure may be intercombined.

[0276] Hereinafter, an apparatus to which various embodiments of the present disclosure can be applied will be described.

[0277] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or operational flow charts disclosed in this document may be applied to various fields requiring wireless communication / connection between devices (e.g., 5G).

[0278] Hereinafter, the present invention will be described in more detail with reference to the drawings. In the following drawings / description, the same reference numerals may represent the same or corresponding hardware blocks, software blocks, or function blocks, unless otherwise stated.

[0279] Fig. 14 illustrates a communication system 1 according to an embodiment of the present disclosure. The embodiment of Fig. 14 can be combined with various embodiments of the present disclosure.

[0280] Referring to FIG. 14, a communication system 1 to which various embodiments of the present disclosure are applied includes a wireless device, a base station, and a network. Here, the wireless device means a device that performs communication using a wireless connection technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)), and is called a communication / wireless / 5G device. Without being limited thereto, the wireless device may include a robot 100a, a vehicle 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a handheld device (Hand-held device) 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI device / server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing communication between vehicles, and the like. Here, the vehicle may include a UAV (Unmanned Aerial Vehicle) (e.g., a drone). The XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, and may be embodied in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, etc. The mobile devices may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, a smart glasses), a computer (e.g., a notebook, etc.), etc. The home appliances may include a TV, a refrigerator, a washing machine, etc. The IoT devices may include a sensor, a smart meter, etc. For example, a base station and a network may be embodied as a wireless device, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0281] Here, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low power communication. At this time, for example, NB-IoT technology is an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-mentioned names. Furthermore, or generally, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may perform communication based on LTE-M technology. At this time, as an example, LTE-M technology is an example of LPWAN technology, and may be called by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above-mentioned names. In addition, or in general, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may include at least one of ZigBee (registered trademark), Bluetooth (registered trademark), and Low Power Wide Area Network (LPWAN), which consider low power communication, and is not limited to the above names. As an example, Zigbee technology can generate personal area networks (PANs) related to small / low power digital communication based on various standards such as IEEE 802.15.4, and is called by various names.

[0282] The wireless devices 100a to 100f may be connected to a network 300 via a base station 200. An AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to an AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f may communicate with each other via the base station 200 / network 300, but may also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Furthermore, an IoT device (eg, a sensor) can directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

[0283] Wireless communications / connections 150a, 150b, and 150c may be established between the wireless devices 100a to 100f and the base station 200, and between the base stations 200 and 200. Here, the wireless communication / connections may be performed via various wireless connection technologies (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, IAB (Integrated Access Backhaul)). Through the wireless communication / connections 150a, 150b, and 150c, the wireless device and the base station / wireless device, and the base station and the base station may transmit / receive wireless signals to each other. For example, the wireless communication / connections 150a, 150b, and 150c may transmit / receive signals via various physical channels. To this end, based on various proposals of the present disclosure, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. may be performed.

[0284] 15 illustrates a wireless device according to one embodiment of the present disclosure. The embodiment of FIG. 15 can be combined with various embodiments of the present disclosure.

[0285] 15, a first wireless device 100 and a second wireless device 200 can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, {first wireless device 100, second wireless device 200} may correspond to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG. 14.

[0286] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may be configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flow charts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate a first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver 106. The processor 102 may also receive a wireless signal including a second information / signal via the transceiver 106, and then store information obtained from signal processing of the second information / signal in the memory 104. The memory 104 may be coupled to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing some or all of the processes controlled by the processor 102 or implementing the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein. Here, the processor 102 and the memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 may be coupled to the processor 102 and may transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be mixed with an RF (Radio Frequency) unit. In this disclosure, a wireless device may also refer to a communication modem / circuit / chip.

[0287] The second wireless device 200 may include one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may be configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flow charts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate a third information / signal, and then transmit a wireless signal including the third information / signal via the transceiver 206. The processor 202 may also receive a wireless signal including a fourth information / signal via the transceiver 206, and then store information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 may be coupled to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing some or all of the processes controlled by the processor 202 or for implementing the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein. Here, the processor 202 and the memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver and may be mixed with an RF unit. In this disclosure, a wireless device may also refer to a communication modem / circuit / chip.

[0288] The hardware elements of the wireless devices 100, 200 are described in more detail below. Without being limited thereto, one or more protocol layers may be embodied by one or more processors 102, 202. For example, one or more processors 102, 202 may embody one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP, etc.). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 can generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information to the one or more transceivers 106, 206 according to the functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 can receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein.

[0289] The one or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein may be implemented using firmware or software configured to be executed by one or more processors 102, 202 or stored in one or more memories 104, 204 and run by one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein may be implemented using firmware or software in the form of code, instructions and / or collections of instructions.

[0290] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may be comprised of 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 be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0291] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or operational flow diagrams, etc., herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams, etc., disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 can be coupled to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208 and may be configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams, etc., disclosed herein via one or more antennas 108, 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing the received user data, control information, radio signals / channels, etc., using one or more processors 102, 202. One or more transceivers 106, 206 may convert user data, control information, radio signals / channels, etc., processed using one or more processors 102, 202, from baseband signals to RF band signals. To this end, one or more transceivers 106, 206 may include an (analog) oscillator and / or a filter.

[0292] 16 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure. The embodiment of FIG. 16 can be combined with various embodiments of the present disclosure.

[0293] Referring to FIG. 16, the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Without being limited thereto, the operations / functions of FIG. 16 may be executed by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 15. The hardware elements of FIG. 16 may be embodied by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 15. For example, the blocks 1010 to 1060 may be embodied by the processors 102, 202 of FIG. 15. Also, the blocks 1010 to 1050 may be embodied by the processors 102, 202 of FIG. 15, and the block 1060 may be embodied by the transceivers 106, 206 of FIG. 15.

[0294] The codeword can be converted into a radio signal through the signal processing circuit 1000 of FIG. 16. Here, the codeword is an encoded bit sequence of an information block. The information block can include a transmission block (e.g., a transmission block of a UL-SCH, a transmission block of a DL-SCH). The radio signal can be transmitted through various physical channels (e.g., a PUSCH, a PDSCH).

[0295] Specifically, the codeword may be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence used for scrambling may be generated based on an initialization value, and the initialization value may include ID information of the wireless device, etc. The scrambled bit sequence may be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-BPSK (pi / 2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying), m-QAM (m-Quadrature Amplitude Modulation), etc. The complex modulation symbol sequence may be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbols of each transmission layer may be mapped to a corresponding antenna port(s) by the precoder 1040 (precoding). The output z of the precoder 1040 is obtained by multiplying the output y of the layer mapper 1030 by a precoding matrix W of N*M. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder 1040 may perform precoding after performing transform precoding (e.g., DFT transformation) on the complex modulation symbols. Also, the precoder 1040 may perform precoding without performing transform precoding.

[0296] The resource mapper 1050 can map the modulation symbols of each antenna port to a time-frequency resource. The time-frequency resource can include a plurality of symbols (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain. The signal generator 1060 generates a radio signal from the mapped modulation symbols, and the generated radio signal can be transmitted to other devices via each antenna. To this end, the signal generator 1060 can include an Inverse Fast Fourier Transform (IFFT) module, a Cyclic Prefix (CP) inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, and the like.

[0297] In the wireless device, the signal processing process for the received signal may be configured in reverse to the signal processing processes 1010 to 1060 of FIG. 16. For example, the wireless device (e.g., 100, 200 of FIG. 15) may receive a wireless signal from the outside through an antenna port / transmitter / receiver. The received wireless signal may be converted to a baseband signal through a signal restorer. For this purpose, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Thereafter, the baseband signal may be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword may be restored to the original information block through decoding. Therefore, a signal processing circuit (not shown) for the received signal may include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0298] FIG. 17 illustrates a wireless device according to an embodiment of the present disclosure. The wireless device can be realized in various forms depending on the use case / service (see FIG. 14). The embodiment of FIG. 17 can be combined with various embodiments of the present disclosure.

[0299] 17, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 15 and may be configured with various elements, components, units, and / or modules. For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit may include a communication circuit 112 and a transceiver(s) 114. For example, the communication circuit 112 may include one or more processors 102, 202 and / or one or more memories 104, 204 of FIG. 15. For example, the transceiver(s) 114 may include one or more transceivers 106, 206 and / or one or more antennas 108, 208 of FIG. 15. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls the overall operation of the wireless device. For example, the control unit 120 can control electrical / mechanical operations of the wireless device based on the programs / codes / instructions / information stored in the memory unit 130. In addition, the control unit 120 can transmit information stored in the memory unit 130 to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit 110, or store information received from an external device (e.g., another communication device) via a wireless / wired interface through the communication unit 110 in the memory unit 130.

[0300] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Without being limited thereto, the wireless device may be embodied in the form of a robot (100a in FIG. 14), a vehicle (100b-1, 100b-2 in FIG. 14), an XR device (100c in FIG. 14), a mobile device (100d in FIG. 14), a home appliance (100e in FIG. 14), an IoT device (100f in FIG. 14), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a Fintech device (or a financial device), a security device, a climate / environment device, an AI server / device (400 in FIG. 14), a base station (200 in FIG. 14), a network node, or the like. The wireless device may be mobile or fixed depending on the use case / service.

[0301] In FIG. 17, various elements, components, units / parts, and / or modules in the wireless devices 100 and 200 may be interconnected entirely through a wired interface, or at least some of them may be wirelessly connected through the communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired and the control unit 120 and a first unit (e.g., 130, 140) may be wirelessly connected through the communication unit 110. Also, each element, component, unit / part, and / or module in the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured as a set of one or more processors. For example, the control unit 120 may be configured as a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 may be composed of a Random Access Memory (RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0302] The embodiment of FIG. 17 will now be described in more detail with reference to other drawings.

[0303] FIG. 18 illustrates a mobile device according to an embodiment of the present disclosure. The mobile device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, a smart glass), or a mobile computer (e.g., a laptop computer). 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. 18 may be combined with various embodiments of the present disclosure.

[0304] 18, the portable device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input / output unit 140c. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130 / 140 in FIG. 17, respectively.

[0305] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from other wireless devices and base stations. The control unit 120 can control components of the portable device 100 and perform various operations. The control unit 120 can include an AP (Application Processor). The memory unit 130 can store data / parameters / programs / codes / commands required for operating the portable device 100. The memory unit 130 can also store input / output data / information, etc. The power supply unit 140a supplies power to the portable device 100 and can include a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support connection between the portable device 100 and other external devices. The interface unit 140b can include various ports (e.g., audio input / output ports, video input / output ports) for connection with external devices. The input / output unit 140c can receive or output video information / signals, audio information / signals, data, and / or information input by a user. The input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0306] For example, in the case of data communication, the input / output unit 140c may acquire information / signals (e.g., touch, text, voice, image, video) input by a user, and the acquired information / signals may be stored in the memory unit 130. The communication unit 110 may convert the information / signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to another wireless device or to a base station. In addition, the communication unit 110 may receive wireless signals from another wireless device or a base station, and then restore the received wireless signals to the original information / signals. The restored information / signals may be stored in the memory unit 130 and then output in various forms (e.g., text, voice, image, video, haptic) via the input / output unit 140c.

[0307] 19 illustrates a vehicle or an autonomous vehicle according to an embodiment of the present disclosure. The vehicle or the autonomous vehicle may be a mobile robot, a car, a train, an aerial vehicle (AV), a ship, etc. The embodiment of FIG. 19 may be combined with various embodiments of the present disclosure.

[0308] 19, a vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 17, respectively.

[0309] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit 120 can control elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 can include an ECU (Electronic Control Unit). The driving unit 140a can cause the vehicle or autonomous vehicle 100 to run on the ground. The driving unit 140a can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and can include wired / wireless charging circuits, batteries, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a forward / reverse sensor of the vehicle, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane while driving, a technology for automatically adjusting speed like adaptive cruise control, a technology for automatically driving along a predetermined route, a technology for automatically setting a route and driving when a destination is set, etc.

[0310] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data. The control unit 120 may control the driving unit 140a so that the vehicle or the autonomous driving vehicle 100 moves along the autonomous driving route according to the driving plan (e.g., speed / direction adjustment). During the autonomous driving, the communication unit 110 may non-periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from surrounding vehicles. Also, during the autonomous driving, the sensor unit 140c may acquire vehicle status and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly acquired data / information. The communication unit 110 may transmit information on the vehicle position, the autonomous driving route, the driving plan, etc. to an external server. The external server may predict traffic information data in advance using AI technology, etc. based on information collected from the vehicle or the autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or the autonomous driving vehicle.

[0311] The claims described in this specification may be combined in various ways. For example, the technical features of the method claims of this specification may be combined and embodied in an apparatus, and the technical features of the device claims of this specification may be combined and embodied in a method. Furthermore, the technical features of the method claims and the technical features of the device claims of this specification may be combined and embodied in an apparatus, and the technical features of the method claims and the technical features of the device claims of this specification may be combined and embodied in a method.

Claims

1. 1. A method for wireless communication in a first device, comprising: obtaining a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer; receiving downlink control information (DCI) from a base station according to a physical downlink control channel (PDCCH) resource, the downlink control information including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource; and starting the HARQ RTT timer after a time domain of the PDCCH resource based on the PUCCH resource being not configured for the first device; The HARQ RTT timer is a minimum interval before a retransmission grant is expected by the first device.

2. The method of claim 1 , wherein the PUCCH resource is not configured for the first device based on the information related to the PUCCH resource being zero.

3. The method of claim 1 , wherein the HARQ RTT timer is started at a first symbol after the end of the PDCCH resource.

4. The method of claim 1 , wherein the at least one SL resource is associated with the PUCCH resource.

5. The method of claim 1 , wherein the DCI includes an index of a resource pool.

6. 6. The method of claim 5, wherein the HARQ RTT timer is started after the time domain of the PDCCH resource based on a periodicity of a physical sidelink feedback channel (PSFCH) resource configured for the resource pool being zero.

7. starting a retransmission timer after the HARQ RTT timer expires; The method of claim 1 , wherein the retransmission timer is a maximum duration until the retransmission grant is received.

8. The method of claim 7 , wherein the retransmission grant is a DCI that includes information related to at least one SL resource allocated by the base station for SL retransmission of the first device.

9. The method of claim 7 , wherein the HARQ RTT timer and the retransmission timer are timers set for each HARQ process between the first device and the base station.

10. The method of claim 1, wherein the DCI is a DCI having a cyclic redundancy check (CRC) scrambled by a radio network temporary identifier (SL-RNTI).

11. The method of claim 1, wherein the DCI is a DCI having a CRC scrambled by a SL-CS (configured scheduling)-RNTI.

12. transmitting, to a second device, a first sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) and a second SCI via a physical sidelink control channel (PSCCH) based on the at least one SL resource; 2. The method of claim 1, further comprising: transmitting the second SCI or medium access control (MAC) protocol data unit (PDU) to the second device via the PSSCH based on the at least one SL resource.

13. The method of claim 1 , wherein the HARQ RTT timer is started after the time region of the PDCCH resource, regardless of whether a PSFCH resource is configured for a resource pool.

14. 1. A first device adapted for wireless communication, At least one transceiver; At least one processor; at least one memory coupled to the at least one processor for storing instructions; The instructions, when executed, cause the first device to: Obtaining a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer; receiving downlink control information (DCI) from a base station according to a physical downlink control channel (PDCCH) resource, the downlink control information including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource; starting the HARQ RTT timer after a time domain of the PDCCH resource based on the PUCCH resource being not configured for the first device; The HARQ RTT timer is a minimum interval before a retransmission grant is expected by the first device.

15. a processing device adapted to control the first device, At least one processor; at least one memory coupled to the at least one processor for storing instructions; The instructions, when executed, cause the first device to: Obtaining a discontinuous reception (DRX) configuration including information related to a hybrid automatic repeat request (HARQ) round trip time (RTT) timer; receiving downlink control information (DCI) from a base station according to a physical downlink control channel (PDCCH) resource, the downlink control information including information related to at least one sidelink (SL) resource and information related to a physical uplink control channel (PUCCH) resource; starting the HARQ RTT timer after a time domain of the PDCCH resource based on the PUCCH resource being not configured for the first device; The HARQ RTT timer is a minimum interval before a retransmission grant is expected by the first device.

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