Method and apparatus for operating an SL DRX timer in NR V2X

Abstract

In a wireless communication system, an operating method of a first device 100 is proposed, which may include the steps of: transmitting an SCI including resource-related information to a second device 200 based on a first resource, where the resource-related information includes information related to a resource subsequent to the first resource; receiving collision information from the second device 200; and reselecting a resource in a candidate resource set, in which the resource subsequent to the first resource is excluded, based on the collision information.

Description

Technical Field

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

Background Art

[0002] Sidelink (SL) means a communication method in which a direct link is established between terminals (User Equipment, UE), and voice or data, etc. are directly exchanged between the terminals without going through a base station (Base Station, BS). SL is considered as one solution to solve the burden on the base station due to rapidly increasing data traffic. V2X (vehicle-to-everything) means a communication technology in which information is exchanged with other vehicles, pedestrians, and things with built-in infrastructure 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 via the PC5 interface and / or the Uu interface.

[0003] On the one hand, as more and more communication devices require larger communication capacities, there is a growing need for mobile broadband communication that is improved compared to existing radio access technologies (RATs). As a result, communication systems that take into account services or terminals sensitive to reliability and latency have been discussed, and next-generation wireless connection technologies that consider improved mobile broadband communication, massive machine type communication (mMTC), ultra-reliable and low-latency communication (URLLC), etc., can be referred to as new radio access technology (new RAT) or NR (new radio). V2X (vehicle-to-everything) communication can also be supported in NR.

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

[0005] In relation to V2X communication, in RAT prior to NR, solutions for providing safety services based on V2X messages such as basic safety messages (BSMs), cooperative awareness messages (CAMs), and decentralized environmental notification messages (DENMs) have been mainly discussed. V2X messages can include location information, dynamic information, attribute information, etc. For example, a terminal can send a periodic message type CAM and / or an event triggered message type DENM to other terminals.

[0006] Subsequently, in connection with V2X communication, various V2X scenarios are presented in NR. For example, the various V2X scenarios can include vehicle platooning, advanced driving, extended sensors, remote driving, and the like.

Summary of the Invention

Means for Solving the Problems

[0007] According to an embodiment of the present disclosure, a method for a first device to perform wireless communication is provided. For example, the method includes: transmitting sidelink control information (SCI) including information related to a resource to a second device based on a first resource, where the information related to the resource includes information related to the next resource of the first resource; receiving collision information from the second device; and reselecting a resource in a candidate resource set excluding the next resource of the first resource based on the collision information.

[0008] According to an embodiment of the present disclosure, a first device for performing wireless communication is provided. For example, the first device can include one or more memories for storing instructions, one or more transceivers, and one or more processors for connecting the one or more memories and the one or more transceivers. For example, the one or more processors execute the instructions, transmit sidelink control information (SCI) including information related to a resource to a second device based on a first resource, where the information related to the resource includes information related to the next resource of the first resource, receive collision information from the second device, and can reselect a resource in a candidate resource set excluding the next resource of the first resource based on the collision information.

[0009] 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 executable by the one or more processors and configured to store instructions. For example, the one or more processors execute the instructions to transmit sidelink control information (SCI) including information related to a resource to a second terminal based on a first resource, where the information related to the resource includes information related to a next resource of the first resource, receive collision information from the second terminal, and reselect a resource from a candidate resource set excluding a next resource of the first resource based on the collision information.

[0010] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium recording instructions is provided. For example, when executed, the instructions cause a first apparatus to: transmit sidelink control information (SCI) including information related to a resource to a second apparatus based on a first resource, where the information related to the resource includes information related to a next resource of the first resource, receive collision information from the second apparatus, and reselect a resource from a candidate resource set excluding a next resource of the first resource based on the collision information.

[0011] According to an embodiment of the present disclosure, a method for a second device to perform wireless communication is provided. For example, the method includes: receiving, based on a first resource, sidelink control information (SCI) including information related to the resource from a first device, where the information related to the resource includes information related to the next resource of the first resource; determining a collision related to the next resource of the first resource; generating collision information based on the collision related to the next resource of the first resource; and transmitting the collision information to the first device, where based on the collision information, the next resource of the first resource is excluded from a candidate resource set, and resource reselection is performed based on the candidate resource set from which the next resource of the first resource is excluded.

[0012] According to an embodiment of the present disclosure, a second device for performing wireless communication is provided. For example, the second device may include one or more memories for storing instructions, one or more transceivers, and one or more processors for connecting the one or more memories and the one or more transceivers. For example, the one or more processors execute the instructions to receive, based on a first resource, sidelink control information (SCI) including information related to the resource from a first device, where the information related to the resource includes information related to the next resource of the first resource, determine a collision related to the next resource of the first resource, generate collision information based on the collision related to the next resource of the first resource, and transmit the collision information to the first device, where based on the collision information, the next resource of the first resource is excluded from a candidate resource set, and resource reselection is performed based on the candidate resource set from which the next resource of the first resource is excluded.

Advantages of the Invention

[0013] The terminal can efficiently perform SL communication.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0035] In this specification, "A or B" can mean "only A", "only B", or "both A and B". Also, in this specification, "A or B" can be interpreted as "A and / or B". For example, in this specification, "A, B or C" can mean "only A", "only B", "only C", or "any combination of A, B and C".

[0036] The slashes ( / ) and commas used in this specification can mean "and / or". For example, "A / B" can mean "A and / or B". Thus, "A / B" can mean "only A", "only B", or "both A and B". For example, "A, B, C" can mean "A, B or C".

[0037] In this specification, "at least one of A and B" can mean "only A", "only B", or "both A and B". Also, in this specification, expressions such as "at least one of A or B" and "at least one of A and / or B" can be interpreted in the same way as "at least one of A and B".

[0038] 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". Also, "at least one of A, B, or C" and "at least one of A, B, and / or C" can mean "at least one of A, B, and C".

[0039] Also, the parentheses used in this specification can mean "for example". Specifically, when displayed as "control information (PDCCH)", "PDCCH" is proposed as an example of "control information". Also, the "control information" in this specification is not limited to "PDCCH", and "PDDCH" is proposed as an example of "control information". Also, when displayed as "control information (i.e., PDCCH)", "PDCCH" is proposed as an example of "control information".

[0040] In this specification, the technical features individually described within one drawing can be embodied individually or simultaneously.

[0041] The following technologies can be used in various wireless communication systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), etc. CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) and CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented with wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, E-UTRA (evolved UTRA), etc. IEEE802.16m is an evolution of IEEE802.16e and provides backward compatibility with systems based on IEEE802.16e. UTRA is part of UMTS (universal mobile telecommunications system). 3GPP (3rd generation partnership project) (registered trademark) LTE (long term evolution) is part of E-UMTS (evolved UMTS) that uses E-UTRA (evolved-UMTS terrestrial radio access), adopts OFDMA in the downlink, and adopts SC-FDMA in the uplink. LTE-A (advanced) is an evolution of 3GPP LTE.

[0042] 5G NR is a successor technology to LTE-A and is a new Clean-slate form of mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, such as low-frequency bands below 1 GHz, intermediate-frequency bands from 1 GHz to 10 GHz, and high-frequency (millimeter-wave) bands above 24 GHz.

[0043] For the sake of clarity, the description will focus on 5G NR, but the technical idea according to an embodiment of the present disclosure is not limited thereto.

[0044] FIG. 2 shows the structure of the NR system according to an embodiment of the present disclosure. The embodiment of FIG. 2 can be combined with various embodiments of the present disclosure.

[0045] Referring to FIG. 2, NG-RAN (Next Generation - Radio Access Network) can include a base station 20 that provides protocol termination of the user plane and the control plane to the terminal 10. For example, the base station 20 can include a gNB (next generation - NodeB) and / or an eNB (evolved - NodeB). For example, the terminal 10 can be fixed or have mobility and is also called by other terms such as MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), MT (Mobile Terminal), Wireless Device, etc. For example, the base station is a fixed station that communicates with the terminal 10 and is also called by other terms such as BTS (Base Transceiver System), Access Point, etc.

[0046] The embodiment of FIG. 2 illustrates the case including only the gNB. The base stations 20 can be interconnected with each other via the Xn interface. The base stations 20 can be connected to a 5th generation core network (5G Core Network: 5GC) via the NG interface. More specifically, the base station 20 can be connected to the AMF (access and mobility management function) 30 via the NG-C interface and can be connected to the UPF (user plane function) 30 via the NG-U interface.

[0047] The layers of the radio interface protocol between the terminal and the network can be classified into L1 (the first layer), L2 (the second layer), and L3 (the third layer) based on the lower three 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 physical channels, and the RRC (Radio Resource Control) layer located in the third layer plays a role of controlling radio resources between the terminal and the network. For this purpose, the RRC layer exchanges RRC messages between the terminal and the base station.

[0048] FIG. 3 shows a radio protocol architecture according to an embodiment of the present disclosure. The embodiment of FIG. 3 can be combined with various embodiments of the present disclosure. Specifically, FIG. 3(a) shows the radio protocol stack of the user plane for Uu communication, and FIG. 3(b) shows the radio protocol stack of the control plane for Uu communication. FIG. 3(c) shows the radio protocol stack of the user plane for SL communication, and FIG. 3(d) shows the radio protocol stack of the control plane for SL communication.

[0049] Referring to FIG. 3, the physical layer provides an information transfer service to the upper layer by using a physical channel. The physical layer is connected to the upper layer MAC (Medium Access Control) layer via a transport channel. Data moves between the MAC layer and the physical layer via the transport channel. The transport channel is classified according to how data is transmitted and what characteristics it has via a wireless interface.

[0050] Data moves between different physical layers, i.e., between the physical layers of a transmitter and a receiver, via a physical channel. The physical channel can be modulated by the OFDM (Orthogonal Frequency Division Multiplexing) method and utilizes time and frequency as wireless resources.

[0051] The MAC layer provides services to the upper layer RLC (radio link control) layer via a logical channel. The MAC layer provides a mapping function from multiple logical channels to multiple transport channels. In addition, the MAC layer provides a logical channel multiplexing function by mapping from multiple logical channels to a single transport channel. The MAC sublayer provides a data transfer service on the logical channel.

[0052] The RLC layer performs concatenation, segmentation, and reassembly of RLC SDUs (Service Data Units). To ensure the various QoS (Quality of Service) requirements of the Radio Bearer (RB), the RLC layer provides three operating modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction via ARQ (automatic repeat request).

[0053] The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transport channels, and physical channels in relation to the configuration, re-configuration, and release of radio bearers. An RB means a logical path provided by the first layer (physical layer or PHY layer) and the second layer (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.

[0054] The functions of the PDCP layer in the user plane include the transfer of user data, header compression, and ciphering. The functions of the PDCP layer in the control plane include the transfer of control plane data and ciphering / integrity protection.

[0055] The SDAP (Service Data Adaptation Protocol) layer is defined only in the user plane. The SDAP layer performs functions such as mapping between QoS flows and data radio bearers, and marking QoS flow identifiers (IDs) in downlink and uplink packets.

[0056] When an RB is configured, it means the process of defining the characteristics of radio protocol layers and channels to provide a specific service, and setting each specific parameter and operation method. Also, RBs are divided into two types: SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

[0057] When an RRC connection is established between the RRC layer of the terminal and the RRC layer of the base station, the terminal enters the RRC_CONNECTED state; otherwise, it enters the RRC_IDLE state. In the case of NR, an additional RRC_INACTIVE state is defined. A terminal in the RRC_INACTIVE state can maintain its connection with the core network while releasing its connection with the base station.

[0058] For the downlink transport channel that transmits data from the network to the terminal, there is a BCH (Broadcast Channel) that transmits system information, and in addition, a downlink SCH (Shared Channel) that transmits user traffic and control messages. In the case of downlink multicast or broadcast service traffic or control messages, they can also be transmitted via the downlink SCH, or can be transmitted via a separate downlink MCH (Multicast Channel). On the other hand, for the uplink transport channel that transmits data from the terminal to the network, there is a RACH (Random Access Channel) that transmits an initial control message, and in addition, an uplink SCH (Shared Channel) that transmits user traffic and control messages.

[0059] Above the transport channel, among the logical channels mapped to the transport channel, there are BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), MTCH (Multicast Traffic Channel), etc.

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

[0061] Referring to FIG. 4, in NR, wireless frames can be used for uplink and downlink transmissions. The wireless frame has a length of 10 ms and can be defined in two 5-ms half-frames (HF). The half-frame can include five 1-ms subframes (SF). The subframe can be divided into one or more slots, and the number of slots in the subframe can be determined by the subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM(A) symbols by means of a CP (cyclic prefix).

[0062] When normal CP is used, each slot can include 14 symbols. When extended CP is used, each slot can include 12 symbols. Here, the symbol can include an OFDM symbol (or a CP-OFDM symbol), an SC-FDMA (Single Carrier-FDMA) symbol (or a DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) symbol).

[0063] Table 1 below exemplifies the number of symbols per slot (N slot symb ), the number of slots per frame (N frame,u slot ), and the number of slots per subframe (N subframe,u slot ) according to the SCS setting (u) when normal CP is used.

[0064]

Table 1

[0065] Table 2 exemplifies the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS when extended CP is used.

[0066]

Table 2

[0067] In the NR system, the OFDM(A) numerology (e.g., SCS, CP length, etc.) can be set to be different among a plurality of cells merged into one terminal. Thereby, the (absolute time) intervals of time resources (e.g., subframes, slots or TTIs) (for convenience, commonly referred to as TUs (Time Unit)) composed of the same number of symbols can be set to be different among the merged cells.

[0068] In NR, a number of numerologies or SCSs for supporting various 5G services can be supported. For example, when the SCS is 15 kHz, a wide area in a traditional cellular band can be supported. When the SCS is 30 kHz / 60 kHz, a dense-urban, lower latency, and wider carrier bandwidth can be supported. When the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz can be supported to overcome phase noise.

[0069] The NR frequency band can be defined in two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The numerical values of the frequency ranges can be changed. 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 "sub 6GHz range", and FR2 can mean "above 6GHz range", and can be called millimeter wave (mmW).

[0070]

Table 3

[0071] As described above, the numerical values of the frequency range of the NR system can be changed. For example, FR1 can include a band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 can 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 within FR1 can include an unlicensed band. The unlicensed band can be used for various applications, for example, it can be used for communication for vehicles (e.g., autonomous driving).

[0072]

Table 4

[0073] FIG. 5 shows the slot structure of an NR frame according to an embodiment of the present disclosure. The embodiment of FIG. 5 can be combined with various embodiments of the present disclosure.

[0074] Referring to FIG. 5, a slot includes a plurality of symbols in the time domain. For example, in the case of normal CP, one slot can include 14 symbols, and in the case of extended CP, one slot can include 12 symbols. Or, in the case of normal CP, one slot can include 7 symbols, and in the case of extended CP, one slot can include 6 symbols.

[0075] The carrier wave includes a plurality of sub - carrier waves in the frequency domain. An RB (Resource Block) can be defined as a plurality (e.g., 12) of consecutive sub - carrier waves in the frequency domain. A BWP (Bandwidth Part) can be defined as a plurality of consecutive (P)RBs ((Physical)Resource Blocks) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier wave can include a maximum of N (e.g., 5) BWPs. Data communication can be performed via the activated BWP. Each element is called a resource element (RE) in the resource grid, and one complex symbol can be mapped to it.

[0076] Hereinafter, the BWP (Bandwidth Part) and the carrier are described.

[0077] A BWP (Bandwidth Part) is a continuous set of PRBs (physical resource blocks) with a given numerology. A PRB can be selected from a continuous subset of CRBs (common resource blocks) for a given numerology on a given carrier wave.

[0078] For example, the BWP is at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the terminal may not monitor the downlink radio link quality in a DL BWP other than the active DL BWP on the PCell (primary cell). For example, the terminal does not receive a PDCCH, a PDSCH (physical downlink shared channel), or a CSI-RS (reference signal) (excluding RRM) outside the active DL BWP. For example, the terminal does not trigger a CSI (Channel State Information) report for an inactive DL BWP. For example, the terminal does not transmit a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel) outside the active UL BWP. For example, when it is downlink, the initial BWP is given as a set of consecutive RBs for an RMSI (remaining minimum system information) CORESET (control resource set) (set by the PBCH (physical broadcast channel)). For example, when it is uplink, the initial BWP is given by an SIB (system information block) for the random access procedure. For example, the default BWP is set by a higher layer. For example, the initial value of the default BWP is the initial DL BWP. For energy saving, when the terminal cannot detect DCI for a certain period, the terminal can switch the active BWP of the terminal to the default BWP.

[0079] On one hand, a BWP can be defined for an 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 the SL channel or the SL signal on the said specific BWP. For a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have separate configuration signalling from the Uu BWP. For example, a terminal can receive the configuration for the SL BWP from a base station / network. For example, a terminal can receive the configuration for the Uu BWP from a base station / network. The SL BWP can be (pre-)configured for out-of-coverage NR V2X terminals and RRC_IDLE terminals within a carrier. For a terminal in the RRC_CONNECTED mode, at least one SL BWP can be activated within a carrier.

[0080] FIG. 6 shows an example of a BWP according to an embodiment of the present disclosure. The embodiment of FIG. 6 can be combined with various embodiments of the present disclosure. In the embodiment of FIG. 6, it is assumed that there are three BWPs.

[0081] Referring to FIG. 6, a CRB (common resource block) is a carrier resource block numbered from one end of a carrier band to the other end. And a PRB is a resource block numbered within each BWP. Point A can indicate a common reference point for a resource block grid.

[0082] A BWP is defined by point A, the offset (N start BWP ) from point A, and the bandwidth (N size BWP) can be set by. For example, point A is the external reference point of the PRB of the carrier where sub-carrier 0 of all numerologies (e.g., all numerologies supported by the network in the corresponding carrier) is aligned. For example, the offset is the PRB interval between the lowest sub-carrier in a given numerology and point A. For example, the bandwidth is the number of PRBs in a given numerology.

[0083] The following will describe V2X or SL communication.

[0084] SLSS (Sidelink Synchronization Signal) is a SL-specific sequence that can include PSSS (Primary Sidelink Synchronization Signal) and SSSS (Secondary Sidelink Synchronization Signal). The PSSS can be referred to as S-PSS (Sidelink Primary Synchronization Signal), and the SSSS can be referred to as S-SSS (Sidelink Secondary Synchronization Signal). For example, length-127M-sequences can be used for S-PSS, and length-127 Gold sequences can be used for S-SSS. For example, a terminal can use S-PSS to detect the first signal and acquire synchronization. For example, a terminal can use S-PSS and S-SSS to acquire detailed synchronization and detect the synchronization signal ID.

[0085] The PSBCH (Physical Sidelink Broadcast Channel) is a (broadcast) channel through which the basic (system) information that a terminal should know first before SL signal transmission and reception is transmitted. For example, the basic information includes information related to SLSS, Duplex Mode (DM), TDD UL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool related information, the type of application related to SLSS, subframe offset, broadcast information, etc. For example, for the evaluation of PSBCH performance, in NR V2X, the payload size of the PSBCH is 56 bits including a 24-bit CRC (Cyclic Redundancy Check).

[0086] S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., an SLSS (Synchronization Signal) / PSBCH block, hereinafter referred to as an S-SSB (Sidelink-Synchronization Signal Block)). The S-SSB can have the same numerology (i.e., SCS and CP length) as the PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) within the carrier, and the transmission bandwidth is within the (pre-set) 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 position of the S-SSB can be (pre-set). Therefore, the terminal does not need to perform hypothesis detection by frequency to find the S-SSB in the carrier.

[0087] FIG. 7 shows a terminal that performs V2X or SL communication according to an embodiment of the present disclosure. The embodiment of FIG. 7 can be combined with various embodiments of the present disclosure.

[0088] Referring to FIG. 7, the term "terminal" in V2X or SL communication can mainly mean the user's terminal. However, when network equipment such as a base station transmits and receives signals according to the communication method between terminals, the base station can also be regarded as a kind of terminal. For example, terminal 1 is the first device 100, and terminal 2 is the second device 200.

[0089] For example, terminal 1 can select a resource unit corresponding to a specific resource within a resource pool that means a set of a series of resources. Then, terminal 1 can use the resource unit to transmit an SL signal. For example, terminal 2, which is the receiving terminal, can receive the setting of the resource pool in which terminal 1 can transmit a signal, and can detect the signal of terminal 1 within the resource pool.

[0090] Here, when terminal 1 is within the connection range of the base station, the base station can notify terminal 1 of the resource pool. On the contrary, when terminal 1 is outside the connection range of the base station, another terminal can notify the resource pool, or terminal 1 can use a pre-set resource pool.

[0091] Generally, a resource pool can be composed of a plurality of resource units, and each terminal can select one or more resource units and use them for transmitting its own SL signal.

[0092] The following describes resource allocation in SL.

[0093] FIG. 8 shows a procedure in which a terminal executes V2X or SL communication in a transmission mode according to an embodiment of the present disclosure. The embodiment of FIG. 8 can be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode can be referred to as a mode or a resource allocation mode. Hereinafter, for convenience of explanation, in LTE, the transmission mode can be referred to as an LTE transmission mode, and in NR, the transmission mode can be referred to as an NR resource allocation mode.

[0094] For example, (a) of FIG. 8 shows terminal operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, (a) of FIG. 8 shows terminal operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to general SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0095] For example, (b) of FIG. 8 shows terminal operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, (b) of FIG. 8 shows terminal operations related to NR resource allocation mode 2.

[0096] Referring to Fig. 8(a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the base station can schedule the SL resources used by the terminal for SL transmission. For example, the base station can perform resource scheduling for terminal 1 via PDCCH (e.g., DCI (Downlink Control Information)) or RRC signaling (e.g., Configured Grant Type1 or Configured Grant Type2), and terminal 1 can perform V2X or SL communication with terminal 2 according to the resource scheduling. For example, after terminal 1 transmits SCI (Sidelink Control Information) to terminal 2 via PSCCH (Physical Sidelink Control Channel), it can transmit the data based on the SCI to terminal 2 via PSSCH (Physical Sidelink Shared Channel).

[0097] Referring to Fig. 8(b), in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal can determine the SL transmission resources within the SL resources set by the base station / network or the pre-set SL resources. For example, the set SL resources or the pre-set SL resources are a resource pool. For example, the terminal can autonomously select or schedule resources for SL transmission. For example, the terminal can itself select resources within the set resource pool and perform SL communication. For example, the terminal can execute sensing and resource (re-)selection procedures and itself select resources within the selection window. For example, the sensing can be performed in units of sub-channels. Then, terminal 1 that has itself selected resources within the resource pool can transmit SCI to terminal 2 via PSCCH and then transmit the data based on the SCI to terminal 2 via PSSCH.

[0098] FIG. 9 shows three cast types according to an embodiment of the present disclosure. The embodiment of FIG. 9 can be combined with various embodiments of the present disclosure. Specifically, FIG. 9(a) shows broadcast type SL communication, FIG. 9(b) shows unicast type SL communication, and FIG. 9(c) shows groupcast type SL communication. In the case of unicast type SL communication, the terminal can perform one-to-one communication with other terminals. In the case of groupcast type SL communication, the terminal can perform SL communication with one or more terminals within the group to which it belongs. In various embodiments of the present disclosure, SL groupcast communication can be replaced with SL multicast communication, SL one-to-many communication, etc.

[0099] The following describes power saving.

[0100] As terminal power saving technologies, terminal adaptation to traffic and power consumption characteristics, adaptation related to frequency / time changes, adaptation to antennas, adaptation to DRX (discontinuous reception) settings, adaptation to terminal processing capabilities, adaptation for reducing PDCCH monitoring / decoding, power saving signals / channels / procedures for triggering adaptation to terminal power consumption, reduction of power consumption in RRM measurements, etc. can be considered.

[0101] The following describes discontinuous reception (DRX), which is one of the technologies that can achieve terminal power saving.

[0102] The procedures of DRX-related terminals can be summarized together with Table 5 below.

[0103]

Table 5

[0104] FIG. 10 shows an example of a DRX cycle according to an embodiment of the present disclosure. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure.

[0105] Referring to FIG. 10, the terminal uses DRX in the RRC_IDLE state and the RRC_INACTIVE state to reduce power consumption. When DRX is set, the terminal executes DRX operations according to the DRX configuration information. The terminal operating as DRX repeats reception operations to turn on and off.

[0106] For example, when DRX is set, the terminal attempts to receive the PDCCH, which is a downlink channel, only within a pre-set time interval and does not attempt to receive the PDCCH within the remaining time intervals. The time interval during which the terminal needs to attempt to receive the PDCCH is called the on-duration, and the on-duration interval is defined once per DRX cycle.

[0107] The terminal can receive DRX configuration information from the gNB via RRC signaling and can operate as DRX via reception of a (long) DRX command MAC CE.

[0108] The DRX configuration information is included in the MAC-CellGroupConfig. The IE MAC-CellGroupConfig is used for setting MAC parameters for a cell group including DRX.

[0109] The DRX command MAC CE or the long DRX command MAC CE is identified by a MAC PDU sub-header having an LCID (logical channel ID). This has a fixed size of 0 bits.

[0110] The following Table 6 illustrates the values of the LCID for the DL-SCH.

[0111]

Table 6

[0112] The PDCCH monitoring operation of the terminal is controlled by DRX and Bandwidth Adaptation (BA). On the other hand, when DRX is set, the terminal does not need to continuously perform PDCCH monitoring. On the other hand, DRX has the following characteristics.

[0113] - on-duration: The period during which the terminal waits to receive the next PDCCH after waking up. If the terminal successfully decodes the PDCCH, the terminal maintains the wake-up state and starts the inactivity timer.

[0114] - inactivity timer: The period during which the terminal is locked again when the time period for which the terminal waits for a successful PDCCH decoding since the last successful PDCCH decoding has elapsed. The terminal needs to restart the inactivity timer after a single successful decoding of the PDCCH for only the first transmission (i.e., not for retransmission).

[0115] - retransmission timer: The time period during which retransmission is expected.

[0116] - period: Defines the periodic repetition of the on-duration and subsequent possible inactivity periods.

[0117] The following describes DRX within the MAC layer. The following represents the MAC entity as the terminal or the MAC entity of the terminal.

[0118] The MAC entity is configured by the RRC with a DRX function that controls the terminal's PDCCH monitoring activity for the C-RNTI (radio network temporary identifier), CS-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, and TPC-SRS-RNTI of the MAC entity. When using the DRX operation, the MAC entity needs to monitor the PDCCH. In the RRC_CONNECTED state, if DRX is configured, the MAC entity can monitor the PDCCH discontinuously using the DRX operation. Otherwise, the MAC entity needs to continuously monitor the PDCCH.

[0119] The RRC controls the DRX operation by setting the parameters of the DRX configuration information.

[0120] When the DRX period is set, the active time includes the following times.

[0121] - The time when the drx-onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL or ra-ContentionResolutionTimer is running; or

[0122] - The time when a scheduling request is transmitted on the PUCCH and is pending; or

[0123] - The time when no PDCCH is received that instructs a new transmission to the MAC entity's C-RNTI after the normal reception of a random access response for a random access preamble that is not selected by the MAC entity among the contention-based random access preambles.

[0124] When DRX is set, the terminal needs to follow the following procedure.

[0125] 1> If the MAC PDU is transmitted in a configured uplink grant

[0126] 2> Immediately after the first reception of the corresponding PUSCH transmission, start the drx-HARQ-RTT-TimerUL for the corresponding HARQ process;

[0127] 2> Abort the drx-RetransmissionTimerUL for the corresponding HARQ procedure.

[0128] 1> If the drx-HARQ-RTT-TimerDL expires:

[0129] 2> If the data of the corresponding HARQ procedure is not successfully decoded:

[0130] 3> Start the drx-RetransmissionTimerDL for the corresponding HARQ procedure.

[0131] 1> If the drx-HARQ-RTT-TimerUL expires:

[0132] 2> Start the drx-RetransmissionTimerUL for the corresponding HARQ procedure.

[0133] 1> If a DRX command MAC CE or a long DRX command MAC CE is received:

[0134] 2> Abort the drx-onDurationTimer;

[0135] 2> Abort the drx-InactivityTimer.

[0136] 1> If the drx-InactivityTimer expires or a DRX command MAC CE is received:

[0137] 2> If a short DRX cycle is configured:

[0138] 3>Start or restart the drx-ShortCycleTimer;

[0139] 3>Use a short DRX cycle.

[0140] 2>If not:

[0141] 3>Use a long DRX cycle.

[0142] 1>If the drx-ShortCycleTimer expires:

[0143] 2>Use a long DRX cycle.

[0144] 1>If a long DRX command MAC CE is received:

[0145] 2>Abort the drx-ShortCycleTimer;

[0146] 2>Use a long DRX cycle.

[0147] 1>If a short DRX cycle is used and [(SFN * 10) + subframe number] modulo (drx-ShortCycle) = (drx-StartOffset) modulo (drx-ShortCycle); or

[0148] 1>If a long DRX cycle is used and [(SFN * 10) + subframe number] modulo (drx-LongCycle) = drx-StartOffset:

[0149] 2>If drx-SlotOffset is set:

[0150] 3>Start the drx-onDurationTimer after drx-SlotOffset.

[0151] 2>If not:

[0152] 3>Start the drx-onDurationTimer.

[0153] 1>If the MAC entity is within the active time:

[0154] 2>Monitor the PDCCH;

[0155] 2>If the PDCCH indicates a DL transmission or if a DL allocation is set:

[0156] 3>Start the drx-HARQ-RTT-TimerDL for the corresponding HARQ procedure immediately after the corresponding PUCCH transmission;

[0157] 3>Abort the drx-RetransmissionTimerDL for the corresponding HARQ procedure.

[0158] 2>If the PDCCH indicates a UL transmission:

[0159] 3>Start the drx-HARQ-RTT-TimerUL for the corresponding HARQ procedure immediately after the first reception of the corresponding PUSCH transmission;

[0160] 3>Abort the drx-RetransmissionTimerUL for the corresponding HARQ procedure.

[0161] 2>If the PDCCH indicates a new transmission (UL or DL):

[0162] 3>Start or resume the drx-InactivityTimer.

[0163] 1>Otherwise (i.e., not part of the active time):

[0164] 2>Do not transmit type-0-triggeredSRS.

[0165] 1> If the CQI masking (cqi-Mask) is set by the upper layer

[0166] 2> If the drx-onDurationTimer does not operate:

[0167] 3> Do not perform CSI reporting on PUCCH.

[0168] 1> Otherwise:

[0169] 2> If the MAC entity is not within the active time:

[0170] 3> Do not perform CSI reporting on PUCCH.

[0171] Regardless of whether the MAC entity monitors the PDCCH or not, when the MAC entity is expected, it transmits HARQ feedback and type-1-triggred SRS.

[0172] If it is not at the complete PDCCH time point (i.e., when the active time starts or ends in the middle of the PDCCH time point), the MAC entity does not need to monitor the PDCCH.

[0173] In this specification, the word "set or defined" is interpreted as being (previously) set by the base station or network via (pre-defined signaling (e.g., SIB, MAC signaling, RRC signaling)). For example, "A is set" can include "the base station or network (previously) sets / defines A for the terminal or notifies it". Or, the word "set or defined" is interpreted as being previously set or defined by the system. For example, "A is set" can include "A is previously set / defined by the system".

[0174] On the other hand, in this specification, for example, a transmitting terminal (TX UE) is a terminal that transmits data to a (target) receiving terminal (RX UE). For example, the transmitting terminal is a terminal that performs PSCCH and / or PSSCH transmission. For example, the transmitting terminal is a terminal that transmits SL CSI-RS and / or an SL CSI reporting request indicator to a (target) receiving terminal. For example, the transmitting terminal is a terminal that transmits a (pre-defined) reference signal (e.g., PSSCH DM-RS (demodulation reference signal)) used for SL (L1) RSRP measurement and / or an SL (L1) RSRP reporting request indicator to a (target) receiving terminal. For example, the transmitting terminal is a terminal that transmits a (control) channel (e.g., PSCCH, PSSCH, etc.) and / or a reference signal (e.g., DM-RS, CSI-RS, etc.) on the (control) channel, which is used for the SL RLM (radio link monitoring) operation and / or the SL RLF (radio link failure) operation of a (target) receiving terminal.

[0175] On the other hand, in this specification, a receiving terminal (RX UE) is a terminal that transmits SL HARQ feedback to a transmitting terminal according to whether it has successfully decoded the data received from the transmitting terminal (TX UE) and / or whether it has successfully detected / decoded the PSCCH (related to PSSCH scheduling) transmitted by the transmitting terminal. For example, the receiving terminal is a terminal that performs SL CSI transmission to the transmitting terminal based on the SL CSI-RS and / or the SL CSI reporting request indicator received from the transmitting terminal. For example, the receiving terminal is a terminal that transmits the measured SL (L1) RSRP measurement value to the transmitting terminal based on the (pre-defined) reference signal and / or the SL (L1) RSRP reporting request indicator received from the transmitting terminal. For example, the receiving terminal is a terminal that transmits its own data to the transmitting terminal. For example, the receiving terminal is a terminal that performs the SL RLM operation and / or the SL RLF operation based on the (pre-configured) (control) channel and / or the reference signal on the (control) channel received from the transmitting terminal.

[0176] On the other hand, in this specification, for example, the transmitting terminal can transmit at least any one of the following information to the receiving terminal via the SCI. Here, for example, the transmitting terminal can transmit at least any one of the following information to the receiving terminal via the first SCI (first SCI) and / or the second SCI (second SCI).

[0177] - PSSCH (and / or PSCCH) related resource allocation information (e.g., position / number of time / frequency resources, resource reservation information (e.g., period))

[0178] - SL CSI report request indicator or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) report request indicator

[0179] - SL CSI transmission indicator (on PSSCH) (or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) information transmission indicator)

[0180] - MCS (Modulation and Coding Scheme) information

[0181] - Transmission power information

[0182] - L1 destination ID information and / or L1 source ID information

[0183] - SL HARQ process ID information

[0184] - NDI (new data indicator) information

[0185] - RV (redundancy version) information

[0186] - (Transmission traffic / packet related) QoS information (e.g., priority information)

[0187] - SL CSI-RS transmission indicator or information on the number of SL CSI-RS antenna ports (to be transmitted)

[0188] - Location information of the transmitting terminal or location (or distance region) information of the target receiving terminal (where SL HARQ feedback is required)

[0189] - Reference signal (such as DM-RS, etc.) information related to decoding of data transmitted via PSSCH and / or channel estimation. For example, the reference signal information is information related to the pattern of (time-frequency) mapping resources of DM-RS, RANK information, antenna port index information, antenna port number information, etc.

[0190] On the other hand, in this specification, for example, PSCCH is mutually replaced / substituted with at least any one of SCI, the first SCI (1 st -stage SCI) and / or the second SCI (2 nd -stage SCI). For example, SCI is mutually replaced / substituted with at least any one of PSCCH, the first SCI and / or the second SCI. For example, PSSCH is mutually replaced / substituted with the second SCI and / or PSCCH.

[0191] On the other hand, in this specification, for example, when the SCI configuration field is divided into two groups considering (relatively) high SCI payload sizes, the first SCI including the first SCI configuration field group can be referred to as 1 st SCI, and the second SCI including the second SCI configuration field group can be referred to as 2 nd SCI. For example, 1 st SCI and 2 nd SCI are transmitted via different channels. For example, 1 st SCI is transmitted to the receiving terminal via PSCCH. For example, 2 ndThe SCI is transmitted to the receiving terminal via the (independent) PSCCH or piggybacked and transmitted together with data via the PSSCH.

[0192] On the other hand, in this specification, for example, "configuration" or "definition" means a (pre-)configuration from a base station or a network. For example, "configuration" or "definition" means a (pre-)configuration for specifying a resource pool from a base station or a network. For example, a base station or a network can transmit information related to "configuration" or "definition" to a terminal. For example, a base station or a network can transmit information related to "configuration" or "definition" to a terminal via pre-defined signaling. For example, the pre-defined signaling can include at least any one of RRC signaling, MAC signaling, PHY signaling, and / or SIB.

[0193] On the other hand, in this specification, for example, "configuration" or "definition" means being specified or configured via pre-configured signaling between terminals. For example, information related to "configuration" or "definition" is transmitted and received between terminals via pre-configured signaling. For example, the pre-defined signaling is PC5 RRC signaling.

[0194] On the other hand, in this specification, for example, RLF is mutually replaced / substituted with OOS (Out-of-Synch) and / or IS (In-Synch).

[0195] On the other hand, in this specification, for example, an RB (resource block) can be mutually replaced / substituted with a sub-carrier. For example, a packet or traffic can be mutually replaced / substituted with a TB (transport block) or a MAC PDU (medium access control protocol data unit) according to the layer to which it is transmitted. For example, a CBG (code block group) can be mutually replaced / substituted with a TB. For example, a source ID can be mutually replaced / substituted with a destination ID. For example, an L1 ID can be mutually replaced / substituted with an L2 ID. For example, an L1 ID is an L1 source ID or an L1 destination ID. For example, an L2 ID is an L2 source ID or an L2 destination ID.

[0196] On the other hand, in this specification, for example, the operation in which a transmitting terminal reserves / selects / determines a retransmission resource means an operation of reserving / selecting / determining a potential retransmission resource whose actual use or not is determined based on the SL HARQ feedback information received by the transmitting terminal from the receiving terminal.

[0197] On the other hand, in this specification, a resource can be mutually replaced / substituted with a slot or a symbol. For example, a resource includes a slot and / or a symbol. For example, a PSSCH can be mutually replaced / substituted with a PSCCH.

[0198] On the other hand, in this specification, SL MODE 1 means a resource allocation method or communication method in which a base station directly schedules SL transmission resources for a transmitting terminal via pre-defined signaling (e.g., DCI or RRC message). For example, SL MODE 2 means a resource allocation method or communication method in which a terminal independently selects SL transmission resources within a resource pool set by or pre-set by a base station or a network. For example, a terminal performing SL communication based on SL MODE 1 can be referred to as a MODE 1 UE or a MODE 1 transmitting terminal, and a terminal performing SL communication based on SL MODE 2 can be referred to as a MODE 2 UE or a MODE 2 transmitting terminal.

[0199] On the other hand, in this specification, for example, DG (dynamic grant) can be mutually replaced / substituted with CG (configured grant) and / or SPS grant (semi persistent scheduling grant). For example, DG can be mutually replaced / substituted with a combination of CG and SPS grant. For example, CG includes at least one of CG type 1 (configured grant type 1) and / or CG type 2 (configured grant type 2). For example, in CG type 1, a grant is provided by RRC signaling and stored as a configured grant. For example, in CG type 2, a grant is provided by PDCCH and stored or deleted as a grant set based on L1 signaling indicating activation or deactivation of the grant. For example, in CG type 1, a base station can allocate periodic resources to a transmitting terminal via an RRC message. For example, in CG type 2, a base station can allocate periodic resources to a transmitting terminal via an RRC message, and the base station can dynamically activate or deactivate the periodic resources via DCI.

[0200] On the other hand, in this specification, a channel is interchangeable / replaceable with a signal. For example, the transmission and reception of a channel can include the transmission and reception of a signal. For example, the transmission and reception of a signal can include the transmission and reception of a channel. For example, a cast is interchangeable / replaceable with at least any one of unicast, groupcast, and / or broadcast. For example, a cast type is interchangeable / replaceable with at least any one of unicast, groupcast, and / or broadcast. For example, a cast or a cast type can include unicast, groupcast, and / or broadcast.

[0201] On the other hand, in this specification, a resource is interchangeable / replaceable with a slot or a symbol. For example, a resource includes a slot and / or a symbol.

[0202] On the other hand, in this specification, a priority is interchangeable / replaceable with at least any one of LCP (Logical Channel Prioritization), latency, reliability, minimum required communication range, PPP (Prose Per-Packet Priority), SLRB (Sidelink Radio Bearer), QoS profile, QoS parameter, and / or requirement.

[0203] On the other hand, in this specification, for example, for the convenience of explanation, a (physical) channel used when a receiving terminal transmits at least any one of the following information to a transmitting terminal can be referred to as a PSFCH.

[0204] - SL HARQ feedback, SL CSI, SL (L1) RSRP

[0205] On the other hand, in this specification, the Uu channel includes the UL channel and / or the DL channel. For example, the UL channel includes PUSCH, PUCCH, SRS (Sounding Refernece Signal), etc. For example, the DL channel includes PDCCH, PDSCH, PSS / SSS, etc. For example, the SL channel includes PSCCH, PSSCH, PSFCH, PSBCH, PSSS / SSSS, etc.

[0206] On the other hand, in this specification, the sidelink information includes at least one of sidelink messages, sidelink packets, sidelink services, sidelink data, sidelink control information, and / or sidelink TB (Transport Block). For example, the sidelink information is transmitted via PSSCH and / or PSCCH.

[0207] On the other hand, in this specification, a higher priority means a smaller priority value, and a lower priority means a larger priority value. For example, Table 5 shows an example of priorities.

[0208]

Table 7

[0209] Referring to Table 7, for example, Service A or Logical Channel A related to the smallest priority value may have the highest priority. For example, Service C or Logical Channel C related to the largest priority value may have the lowest priority.

[0210] On the other hand, in NR V2X communication or NR sidelink communication, the transmitting terminal can reserve / select one or more transmission resources for sidelink transmission (e.g., initial transmission and / or retransmission), and the transmitting terminal can notify the receiving terminal of information regarding the positions of the one or more transmission resources.

[0211] On the other hand, when performing sidelink communication, the method by which a transmitting terminal reserves or pre-determines transmission resources for a receiving terminal is typically in the following forms.

[0212] For example, the transmitting terminal can perform reservation of transmission resources on a chain basis. Specifically, for example, when the transmitting terminal performs reservation of K transmission resources, the transmitting terminal can transmit or notify the receiving terminal of the position information of less than K transmission resources via an SCI transmitted to the receiving terminal at an arbitrary (or specific) transmission time or time resource. That is, for example, the SCI includes the position information of less than K transmission resources. Or, for example, when the transmitting terminal performs reservation of K transmission resources related to a specific TB, the transmitting terminal can notify or transmit the position information of less than K transmission resources to the receiving terminal via an SCI transmitted to the receiving terminal at an arbitrary (or specific) transmission time or time resource. That is, the SCI includes the position information of less than K transmission resources. At this time, for example, by signaling only the position information of less than K transmission resources to the receiving terminal via one SCI transmitted at an arbitrary (or specific) transmission time or time resource, it is possible to prevent performance degradation due to a transient increase in the SCI payload.

[0213] FIG. 11 shows, according to an embodiment of the present disclosure, a method by which a terminal that has reserved transmission resources notifies other terminals of information related to the transmission resources. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure.

[0214] Specifically, for example, in FIG. 11(a), when the K value is 4, the transmitting terminal transmits / signals the position information of (up to) two transmission resources to the receiving terminal via one SCI, thereby executing chain-based resource reservation. For example, in FIG. 11(b), when the K value is 4, the transmitting terminal transmits / signals the position information of (up to) three transmission resources to the receiving terminal via one SCI, thereby executing chain-based resource reservation. For example, referring to FIGS. 11(a) and (b), the transmitting terminal can transmit / signal only the position information of the fourth (or last) transmission-related resource to the receiving terminal via the fourth (or last) transmission-related PSCCH. For example, referring to FIG. 11(a), the transmitting terminal can transmit / signal not only the position information of the fourth (or last) transmission-related resource but also the position information of the third transmission-related resource to the receiving terminal additionally via the fourth (or last) transmission-related PSCCH. For example, referring to FIG. 11(b), the transmitting terminal can transmit / signal not only the position information of the fourth (or last) transmission-related resource but also the position information of the second and third transmission-related resources to the receiving terminal additionally via the fourth (or last) transmission-related PSCCH. At this time, for example, in FIGS. 11(a) and (b), when the transmitting terminal transmits / signals only the position information of the fourth (or last) transmission-related resource to the receiving terminal via the fourth (or last) transmission-related PSCCH, the transmitting terminal can set or specify the position information field / bit of the unused or remaining transmission resources to a pre-set value (for example, 0). For example, in FIGS. 11(a) and (b), when the transmitting terminal transmits / signals only the position information of the fourth (or last) transmission-related resource to the receiving terminal via the fourth (or last) transmission-related PSCCH, the transmitting terminal can set or specify to indicate a pre-set state / bit value indicating that the position information field / bit of the unused or remaining transmission resources is the last transmission (among four transmissions).

[0215] On the other hand, for example, the transmitting terminal can reserve transmission resources on a block basis. Specifically, for example, when the transmitting terminal reserves K transmission resources, the transmitting terminal can transmit or notify all the position information related to the K transmission resources to the receiving terminal via the SCI transmitted to the receiving terminal at an arbitrary (or specific) transmission time or time resource. That is, the SCI includes the position information of the K transmission resources. For example, when the transmitting terminal reserves K transmission resources related to a specific TB, the transmitting terminal can transmit or notify all the position information related to the K transmission resources to the receiving terminal via the SCI transmitted to the receiving terminal at an arbitrary (or specific) transmission time or time resource. That is, the SCI includes the position information of the K transmission resources. For example, (c) in FIG. 11 shows a method of performing block-based resource reservation by the transmitting terminal signaling four transmission resource position information to the receiving terminal via one SCI when the K value is 4.

[0216] According to an embodiment of the present disclosure, due to characteristics of wireless communication, SL-UL prioritization comparison (and / or LTE SL-NR SL prioritization comparison) of a receiving terminal, etc., it may be difficult for a transmitting terminal to always guarantee normal reception of a (target) receiving terminal for an SCI (and / or PSCCH, and / or PSSCH) transmitted by itself. For example, the characteristics of the wireless communication may include interference, fading effect, etc. Also, for example, due to a resource reselection operation based on a pre-emption check (and / or re-evaluation) performed by a (target) receiving terminal, an SCI (and / or PSCCH, and / or PSSCH) transmission omission (and / or resource reselection operation) based on SL-UL prioritization comparison (and / or LTE SL-NR SL prioritization comparison, and / or congestion control), etc., it may be difficult to always guarantee transmission / reception of the SCI (and / or PSCCH, and / or PSSCH) of the transmitting terminal on a resource reserved / selected via a prior SCI received from the transmitting terminal. Considering this, for example, an efficient SL DRX timer operation method between different terminals is proposed in the following proposed method.

[0217] According to an embodiment of the present disclosure, when the receiving terminal fails to decode the SCI (and / or PSCCH) on the resource reserved / selected via the previous SCI (received from the transmitting terminal) (and / or when it is not possible to perform a decoding attempt for the SCI (and / or PSCCH)), the most recent (associated with the same TB (and / or SL HARQ process)) (based on normal SCI decoding) NACK (negative acknowledge) information (e.g., PSFCH) transmission time (and / or the omission time of the NACK information (and / or PSFCH transmission)) (RX_NKTIMING) within the (past) time window of a pre-set length is used as a reference / base to assume that the SL DRX timer (e.g., retransmission (RE-TX) timer, HARQ RTT timer) is started. Then, for example, the receiving terminal is set to perform a decoding / monitoring operation (and / or wake-up operation) for the SCI (associated with the TB) based on the assumed SL DRX timer start time.

[0218] Here, for example, when such rules are applied, the transmitting terminal does not perform SCI transmission to the (target) receiving terminal on the resources reserved / selected via a previous SCI (and / or reselects the resources reserved / selected via a previous SCI at another time / frequency resource) due to, for example, resource reselection operations based on preemption check (and / or re-evaluation), omission of SCI (and / or PSCCH, and / or PSSCH) transmission based on SL-UL priority comparison (and / or LTE SL-NR SL priority comparison, and / or congestion control), etc. It can be assumed that the SL DRX timer (for example, retransmission timer, HARQ RTT timer) of the (receiving terminal) is started based on the reception timing (TX_NKTIMING) of NACK information (for example, PSFCH) from the most recent receiving terminal within the (past) time window of a preset length for the same TB (and / or SL HARQ process). Then, for example, the transmitting terminal is set to select (limitingly) the retransmission resources of the SCI related to the TB in consideration of this. Here, for example, when the SL DRX timer based on TX_NKTIMING expires, the transmitting terminal is set to omit the TB transmission (and / or retransmission) related to the associated SL HARQ process.

[0219] Here, for example, TX_NKTIMING is interpreted / defined when the transmitting terminal normally receives the PSFCH of the (target) receiving terminal's (actual) NACK information, or is interpreted / defined not only when the transmitting terminal normally receives the PSFCH of the (target) receiving terminal's (actual) NACK information but also includes the time when the PSFCH cannot be monitored / received for SL-UL priority comparison etc. That is, for example, TX_NKTIMING is interpreted / defined (limited) so as not to include the time when the transmitting terminal cannot monitor / receive the PSFCH for SL-UL priority comparison (and / or, LTE SL-NR SL priority comparison, and / or, PSFCH TX-RX priority comparison) etc. from the receiving terminal, or is interpreted / defined to include not only the time of normal reception of NACK information but also the time when the transmitting terminal cannot monitor / receive the PSFCH for SL-UL priority comparison etc. from the receiving terminal.

[0220] For example, the transmission of IUC messages (inter-UE coordination messages) is set to be executed / triggered according to the following (partial) rules.

[0221] For example, in the case of a pre-set terminal type (for example, a power saving terminal, a pedestrian terminal), it is set not to execute the IUC message transmission when it has the remaining (battery) power below the pre-set threshold level. And / or, for example, in the case of a power saving terminal with the remaining (battery) power above the pre-set threshold level, even if it receives ACK information from the (target) receiving terminal, it is set to wake up within the (SL DRX) inactive time interval for sensing operations etc. required for IUC message generation.

[0222] According to an embodiment of the present disclosure, the reselection check for the received IUC message-based reservation / selected (future) resource is performed (limitedly) only in the situation where a MAC PDU transmitted via the (future) resource exists / generated (and / or is performed (limitedly) only for the (future) reservation / selected resource located within a preset time window). For example, the situation where a MAC PDU transmitted via the (future) resource exists / generated is interpreted when there is priority information of the data transmitted via the (future) resource.

[0223] And / or, for example, the reselection check for the received IUC message-based reservation / selected (future) resource is set to determine only for the resources used for the transmission of (one and / or a preset number of) MAC PDUs (e.g., TB) (generated at present) of another (target) terminal (grasped based on SCI decoding) by the terminal that generates / transmits the IUC message whether there can be a resource collision (and / or whether there is interference above a preset threshold level), and feedback (to the (target) terminal).

[0224] FIG. 12 shows a procedure for a receiving terminal to transmit an IUC message according to an embodiment of the present disclosure. The embodiment of FIG. 12 can be combined with various embodiments of the present disclosure.

[0225] Referring to FIG. 12, the transmitting terminal can transmit an SCI to the receiving terminal, and the receiving terminal can transmit an IUC message to the transmitting terminal based on the SCI. For example, the transmitting terminal can determine whether resource reselection is possible based on the IUC message. The SCI can include information related to the next resource and / or resource reservation period information, or may not include it.

[0226] For example, referring to Fig. 12(a), in step S1210A, the receiving terminal can receive an SCI including resource information from the transmitting terminal based on the first resource. Here, the resource information can include information related to at least one resource including the first resource and the second resource. For example, the second resource is the first resource after the first resource among the at least one resource. In step S1220A, the receiving terminal can determine whether a collision occurs related to the at least one resource. In step S1230A, the receiving terminal can transmit information related to whether the collision occurs to the transmitting terminal via an IUC message. Here, the transmission resource for receiving the IUC message can determine whether resource reselection is possible for the second resource based on the IUC message. For example, the transmission resource can receive the IUC message and perform resource reselection for the second resource.

[0227] For example, referring to Fig. 12(b), in step S1210B, the receiving terminal can receive an SCI including resource reservation period information from the transmitting terminal based on the first resource. Here, the SCI does not include information related to another resource. In step S1220B, the receiving terminal can determine whether a collision occurs related to the first resource in the next period. In step S1230B, the receiving terminal can transmit information related to whether the collision occurs to the transmitting terminal via an IUC message. Here, the transmission resource for receiving the IUC message can determine whether resource reselection is possible for the first resource in the next period based on the IUC message. For example, the transmission resource can receive the IUC message and perform resource reselection for the first resource in the next period.

[0228] For example, referring to FIG. 12(c), in step S1210C, the receiving terminal can receive from the transmitting terminal a SCI including resource information and resource reservation period information based on a first resource. Here, the resource information can include information related to at least one resource including the first resource and a second resource. For example, the second resource is the first resource after the first resource among the at least one resource. In step S1220C, the receiving terminal can determine whether a collision can occur with respect to the at least one resource and the first resource in the next period. In step S1230C, the receiving terminal can transmit to the transmitting terminal information related to whether a collision can occur via an IUC message. Here, the transmission resource for receiving the IUC message can determine whether resource reselection is possible for the second resource based on the IUC message. For example, the transmission resource can receive the IUC message and perform resource reselection for the second resource. That is, when the SCI includes all of the resource reservation period and resource information, if the transmitting terminal receives information related to whether a collision can occur, the transmitting terminal can perform resource reselection for the second resource, which is the resource next to the resource (first resource) where the SCI is transmitted.

[0229] For example, the IUC message is transmitted via a PSFCH. For example, the IUC message is transmitted separately from HARQ feedback information. For example, from the perspective of the transmitting terminal, when the reception of the IUC message overlaps with the reporting of HARQ feedback information via UL, the reporting of the HARQ feedback information takes precedence. For example, the transmitting terminal can determine whether to perform resource reselection based on the IUC message.

[0230] According to an embodiment of the present disclosure, when a transmitting terminal executes an LCP procedure for MAC PDU transmission to at least one receiving terminal that performs SL DRX operation, MAC PDU generation / transmission is set to be executed based on data (usable) related to the highest-priority LCH among at least one LCH having a destination (ID) related to at least one receiving terminal that is in the active time (at the resource time point related to the generated SL grant). That is, for example, when the LCP procedure is executed, if the receiving terminal related to the destination ID is in the active time at the resource time point related to the generated SL grant, MAC PDU generation / transmission is executed based on the priority among the LCHs having the destination ID.

[0231] FIG. 13 shows an embodiment in which an LCP procedure is executed according to an embodiment of the present disclosure. The embodiment of FIG. 13 can be combined with various embodiments of the present disclosure.

[0232] Referring to FIG. 13, four LCHs that are the targets for executing the LCP procedure are shown. For example, the LCP procedure means a procedure for determining the order of generating a MAC PDU based on, for example, the priority of at least one LCH that is the target. For example, in the present embodiment, the LCP procedure executed for LCH1, LCH2, LCH3, and LCH4 is described. For example, in the present embodiment, the LCP procedure executed based on the SL DRX setting set for each destination ID related to each LCH, at the same time as the priority related to each LCH, is described.

[0233] For example, the priority value of the available data related to LCH1 is 3, the priority value of the available data related to LCH2 is 4, the priority value of the available data related to LCH3 is 1, and the priority value of the available data related to LCH4 is 2. In this case, it can be shown that the lower the priority value, the higher the related priority. That is, among LCH1 to LCH4 in the present embodiment, the LCH with the highest priority of the related available data is LCH3.

[0234] Here, for example, it is assumed that the destination ID related to LCH1 and LCH2 is A, and the destination ID related to LCH3 and LCH4 is B. Also, for example, it is assumed that the time when the MAC PDU generated as a result of the executed LCP is transmitted is included in the active time of the SL DRX setting A related to the A, and at the same time, is not included in the active time of the SL DRX setting B related to the B. Here, although the priority of LCH3 is the highest as described above, according to the present embodiment, when the time when the generated MAC PDU is transmitted is not included in the active time of the SL DRX setting related to LCH3, the terminal that executes the LCP procedure can exclude LCH3 and LCH4 from the generation of the MAC PDU. That is, the generated MAC PDU can include only LCH1 and LCH2. Through this, the generated MAC PDU is always transmitted during the active time of the receiving terminal, and SL communication is executed more efficiently.

[0235] According to an embodiment of the present disclosure, between different terminals, (transmission and / or reception) resource pool information related to the application of the SL DRX operation of itself (or another terminal) is signaled via an IUC message (and / or pre-set upper / physical layer signaling). For example, the resource pool information can include a resource pool index, time / frequency resource position information constituting the resource pool, and the like.

[0236] For example, service type (and / or (LCH or service) priority and / or QOS requirements (e.g., latency, reliability, minimum communication range) and / or PQI parameters) (and / or HARQ feedback enabled (and / or disabled) LCH / MAC PDU (transmission) and / or CBR measurement values of a resource pool and / or SL cast type (e.g., unicast, groupcast, broadcast) and / or SL groupcast HARQ feedback options (e.g., NACK only feedback, ACK / NACK feedback, TX-RX distance-based NACK only feedback) and / or SL MODE 1CG type (e.g., SL CG type 1 / 2) and / or SL mode type (e.g., mode 1 / 2) and / or resource pool and / or availability of a resource pool with PSFCH resources set and / or source (L2) ID (and / or destination (L2) ID) and / or PC5 RRC connection link and / or SL link and / or connection state with (a base station) (e.g., RRC CONNECTED state, IDLE state, INACTIVE state) and / or SL HARQ process (ID) and / or availability of SL DRX operation execution for (a transmitting terminal or a receiving terminal) and / or availability of an energy-saving (transmitting or receiving) terminal and / or when PSFCH transmission and PSFCH RX overlap (and / or multiple PSFCH transmissions (exceeding terminal capability)) from a specific terminal perspective (and / or when PSFCH transmission (and / or PSFCH reception) is omitted) and / or when a receiving terminal actually (normally) receives a PSCCH (and / or PSSCH) (re)transmission from a transmitting terminal, etc., among the elements / parameters, (or separately), for at least one of them, the applicability of the said rule (and / or the proposed method / rule-related parameter values of the present disclosure) is specified (or, differently, or independently) set / permitted.

[0237] Also, in the present disclosure, the "configuration" (or "designation") word is interpreted in an extended sense, such as in a form in which the base station notifies the terminal via a pre-defined (physical layer or upper layer) channel / signal (e.g., SIB, RRC, MAC CE), and / or in a form provided via pre-configuration, and / or in a form in which the terminal notifies another terminal via a pre-defined (physical layer or upper layer) channel / signal (e.g., SL MAC CE, PC5 RRC).

[0238] Also, in the present disclosure, the "PSFCH" word is interpreted in an extended sense as "(NR or LTE) PSSCH (and / or (NR or LTE) PSCCH) (and / or (NR or LTE) SL SSB (and / or UL channel / signal))".

[0239] Also, the proposed methods in the present disclosure are combined with each other and extended for use in a new form.

[0240] According to an embodiment of the present disclosure, the transmitting terminal can confirm, via an IUC message, whether there is a collision for the resource indicated by the transmitting terminal via the SCI. Through this, the transmitting terminal can perform resource reselection for the resource where a collision occurs, and as a result, SL communication is executed smoothly.

[0241] FIG. 14 shows a procedure for a first device to perform wireless communication according to an embodiment of the present disclosure. The embodiment of FIG. 14 can be combined with various embodiments of the present disclosure.

[0242] Referring to FIG. 14, in step S1410, the first device can transmit SCI (sidelink control information) including information related to the resource to the second device based on the first resource. For example, the information related to the resource can include information related to the next resource of the first resource. In step S1420, the first device can receive collision information from the second device. In step S1430, the first device can reselect a resource in a candidate resource set excluding the next resource of the first resource based on the collision information.

[0243] For example, the information related to the resource can include a resource reservation period.

[0244] For example, the information related to the resource includes information related to at least one resource different from the first resource within the same period as the first resource, and based on the second resource being the first resource among the at least one resource after the first resource, the next resource of the first resource is the second resource.

[0245] For example, based on the information related to the resource not including information related to a resource different from the first resource within the same period as the first resource, the next resource of the first resource is a resource in the next period of the first resource.

[0246] For example, the information related to the resource does not include a resource reservation period.

[0247] For example, the information related to the resource includes information related to at least one resource different from the first resource within the same period as the first resource, and based on the second resource being the first resource among the at least one resource after the first resource, the next resource of the first resource is the second resource.

[0248] For example, the collision information is generated based on decoding of an SCI transmitted by a third device.

[0249] For example, the collision information is generated based on interference related to resources used by the third device to transmit a MAC (medium access control) PDU (protocol data unit).

[0250] For example, the resource next to the first resource is a resource related to one MAC PDU.

[0251] For example, the reselection is performed based on the presence of a MAC PDU transmitted in the resource next to the first resource.

[0252] For example, the presence of the MAC PDU is determined based on the presence of priority information related to the MAC PDU.

[0253] For example, the reselection can include: excluding the resource next to the first resource from a candidate resource set, and selecting a second resource within the candidate resource set.

[0254] For example, the collision information is received via an inter-UE coordination message.

[0255] The above-described embodiments can be applied to various apparatuses described below. For example, the processor 102 of the first apparatus 100 can control the transceiver 106 to transmit SCI (sidelink control information) including information related to resources to the second apparatus 200 based on the first resource. For example, the information related to the resource can include information related to the next resource of the first resource. Then, the processor 102 of the first apparatus 100 can control the transceiver 106 to receive collision information from the second apparatus 200. Then, the processor 102 of the first apparatus 100 can reselect a resource from a candidate resource set in which the next resource of the first resource is excluded based on the collision information.

[0256] According to an embodiment of the present disclosure, a first apparatus for performing wireless communication is provided. For example, the first apparatus can include one or more memories for storing instructions, one or more transceivers, and one or more processors for connecting the one or more memories and the one or more transceivers. For example, the one or more processors execute the instructions, transmit SCI (sidelink control information) including information related to resources to a second apparatus based on a first resource, where the information related to the resource includes information related to the next resource of the first resource, receive collision information from the second apparatus, and reselect a resource from a candidate resource set in which the next resource of the first resource is excluded based on the collision information.

[0257] For example, the information related to the resource can include a resource reservation period.

[0258] For example, the information related to the resource includes information related to at least one resource different from the first resource within the same period as the first resource, and based on the second resource being the first resource among the at least one resource after the first resource, the next resource of the first resource is the second resource.

[0259] For example, based on the information related to the resource not including information related to a resource different from the first resource within the same period as the first resource, the next resource of the first resource is a resource in the next period of the first resource.

[0260] For example, the information related to the resource does not include a resource reservation period.

[0261] For example, the information related to the resource includes information related to at least one resource different from the first resource within the same period as the first resource, and based on the second resource being the first resource among the at least one resource after the first resource, the next resource of the first resource is the second resource.

[0262] For example, the collision information is generated based on decoding of an SCI transmitted by a third device.

[0263] For example, the collision information is generated based on interference related to a resource used by the third device to transmit a MAC (medium access control) PDU (protocol data unit).

[0264] For example, the next resource of the first resource is a resource related to one MAC PDU.

[0265] For example, the reselection is performed based on the presence of a MAC PDU transmitted at the next resource of the first resource.

[0266] For example, the presence of the MAC PDU is determined based on the presence of priority information related to the MAC PDU.

[0267] For example, the reselection may include: excluding the next resource of the first resource from a candidate resource set, and selecting a second resource within the candidate resource set.

[0268] For example, the collision information is received via an inter-UE coordination message between terminals.

[0269] 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 executable by the one or more processors and storing instructions. For example, the one or more processors execute the instructions to transmit SCI (sidelink control information) including information related to a resource to a second terminal based on a first resource, where the information related to the resource includes information related to the next resource of the first resource, receive collision information from the second terminal, and reselect a resource in a candidate resource set from which the next resource of the first resource has been excluded based on the collision information.

[0270] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium recording instructions is provided. For example, when executed, the instructions cause a first device to: transmit SCI (sidelink control information) including information related to a resource to a second device based on a first resource, where the information related to the resource includes information related to a next resource of the first resource, receive collision information from the second device, and reselect a resource from a candidate resource set excluding a next resource of the first resource based on the collision information.

[0271] FIG. 15 shows a procedure for a second device to perform wireless communication according to an embodiment of the present disclosure. The embodiment of FIG. 15 can be combined with various embodiments of the present disclosure.

[0272] Referring to FIG. 15, in step S1510, the second device can receive SCI (sidelink control information) including information related to a resource from the first device based on a first resource. For example, the information related to the resource can include information related to a next resource of the first resource. In step S1520, the second device can determine a collision related to a next resource of the first resource. In step S1530, the second device can generate collision information based on the collision related to a next resource of the first resource. In step S1540, the second device can transmit the collision information to the first device. For example, based on the collision information, a next resource of the first resource is excluded from a candidate resource set, and resource reselection is performed based on the candidate resource set excluding the next resource of the first resource.

[0273] For example, the information related to the resource includes information related to at least one resource different from the first resource within the same period as the first resource, and based on the second resource being the first resource after the first resource among the at least one resource, the next resource of the first resource is the second resource.

[0274] The above-described embodiments can be applied to various devices described below. For example, the processor 202 of the second device 200 can control the transceiver 206 to receive SCI (sidelink control information) including information related to the resource from the first device 100 based on the first resource. For example, the information related to the resource can include information related to the next resource of the first resource. Then, the processor 202 of the second device 200 can determine a collision related to the next resource of the first resource. Then, the processor 202 of the second device 200 can generate collision information based on the collision related to the next resource of the first resource. Then, the processor 202 of the second device 200 can control the transceiver 206 to transmit the collision information to the first device 100. For example, based on the collision information, the next resource of the first resource is excluded from the candidate resource set, and resource reselection is performed based on the candidate resource set from which the next resource of the first resource has been excluded.

[0275] According to an embodiment of the present disclosure, a second device for performing wireless communication is provided. For example, the second device may include one or more memories for storing instructions, one or more transceivers, and one or more processors for connecting the one or more memories and the one or more transceivers. For example, the one or more processors execute the instructions and receive SCI (sidelink control information) including information related to a resource from a first device based on a first resource, where the information related to the resource includes information related to a next resource of the first resource, determine a collision related to the next resource of the first resource, and generate collision information based on the collision related to the next resource of the first resource, and transmit the collision information to the first device. Based on the collision information, the next resource of the first resource is excluded from a candidate resource set, and resource reselection is performed based on the candidate resource set from which the next resource of the first resource has been excluded.

[0276] For example, the information related to the resource includes information related to at least one resource different from the first resource within the same period as the first resource, and based on the second resource being the first resource among the at least one resource, the next resource of the first resource is the second resource.

[0277] Various embodiments of the present disclosure can be mutually combined.

[0278] Hereinafter, a device to which various embodiments of the present disclosure can be applied will be described.

[0279] Without being limited thereto, the various descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document can be applied to various fields that require wireless communication / connection (e.g., 5G) between devices.

[0280] The following will be more specifically exemplified with reference to the drawings. In the following drawings / description, the same reference numerals can exemplify the same or corresponding hardware blocks, software blocks, or functional blocks unless otherwise described differently.

[0281] FIG. 16 shows a communication system 1 according to an embodiment of the present disclosure.

[0282] Referring to FIG. 16, 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 executes communication using a wireless connection technology (for example, 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, vehicles 100b-1, 100b-2, an XR (Extended Reality) device 100c, a hand-held device 100d, a home appliance 100e, an IoT (Internet of Thing) device 100f, and an AI device / server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of executing communication between vehicles, and the like. Here, the vehicle may include a UAV (Unmanned Aerial Vehicle) (for example, a drone). The XR device includes an AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) device, and may be embodied in the form of an HMD (Head-Mounted Device), an HUD (Head-Up Display) provided in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like. The hand-held device may include a smartphone, a smart pad, a wearable device (for example, a smart watch, smart glasses), a computer (for example, a notebook, etc.). The home appliance may include a TV, a refrigerator, a washing machine, and the like. The IoT device may include a sensor, a smart meter, and the like. For example, the base station and the network may be embodied by a wireless device, and a specific wireless device 200a may also operate as a base station / network node for other wireless devices.

[0283] Here, the wireless communication technologies implemented in the wireless devices 100a to 100f of this specification can include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low-power communication. At this time, for example, the NB-IoT technology is an example of LPWAN (Low Power Wide Area Network) technology and can be implemented as standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-mentioned names. Further or generally, the wireless communication technologies implemented in the wireless devices 100a to 100f of this specification can communicate based on the LTE-M technology. At this time, as an example, the LTE-M technology is an example of LPWAN technology and is called by various names such as eMTC (enhanced Machine Type Communication). For example, the LTE-M technology can be implemented by at least any 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. Further, or generally, the wireless communication technologies implemented in the wireless devices 100a to 100f of this specification can include at least any one of ZigBee, Bluetooth (registered trademark), and Low Power Wide Area Network (LPWAN) considering low-power communication, and are not limited to the above-mentioned names. As an example, the Zigbee technology can generate PAN (personal area networks) related to small / low-power digital communication based on various standards such as IEEE 802.15.4 and is called by various names.

[0284] Wireless devices 100a to 100f can be connected to network 300 via base station 200. AI (Artificial Intelligence) technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can be connected to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network, etc. Wireless devices 100a to 100f can communicate with each other via base station 200 / network 300, but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0285] Wireless devices 100a to 100f, base station 200, and between base stations 200 can perform wireless communication / linking 150a, 150b, 150c. Here, the wireless communication / linking can be performed via uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and communication 150c between base stations (for example, various wireless connection technologies such as relay, IAB (Integrated Access Backhaul) (for example, 5G NR)). Through the wireless communication / linking 150a, 150b, 150c, the wireless device and the base station / wireless device, and the base station and the base station can transmit / receive wireless signals to / from each other. For example, the wireless communication / linking 150a, 150b, 150c can transmit / receive signals via various physical channels. Therefore, based on various proposals of the present disclosure, at least a part of various configuration information setting processes, various signal processing processes (for example, channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. for transmitting / receiving wireless signals can be executed.

[0286] FIG. 17 shows a wireless device according to an embodiment of the present disclosure.

[0287] Referring to FIG. 17, the first wireless device 100 and the second wireless device 200 can transmit and receive wireless signals via various wireless connection technologies (for example, LTE, NR). Here, {the first wireless device 100, the second wireless device 200} can correspond to {the wireless device 100x, the base station 200} and / or {the wireless device 100x, the wireless device 100x} in FIG. 16.

[0288] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 can control the memory 104 and / or the transceiver 106 and can be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. For example, after the processor 102 processes the information in the memory 104 to generate a first piece of information / signal, it can transmit a wireless signal including the first piece of information / signal via the transceiver 106. Also, after the processor 102 receives a wireless signal including a second piece of information / signal via the transceiver 106, it can store the information obtained from the signal processing of the second piece of information / signal in the memory 104. The memory 104 can be coupled to the processor 102 and can store various information related to the operation of the processor 102. For example, the memory 104 can execute some or all of the processes controlled by the processor 102, or store software code including instructions for executing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor 102 and the memory 104 are part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 106 can be coupled to the processor 102 and can transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 can include a transmitter and / or a receiver. The transceiver 106 can be used interchangeably with an RF (Radio Frequency) unit. In the present disclosure, the wireless device can also mean a communication modem / circuit / chip.

[0289] The second wireless device 200 includes one or more processors 202, one or more memories 204, and can additionally further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 can control the memory 204 and / or the transceiver 206 and can be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. For example, after the processor 202 processes the information in the memory 204 to generate a third piece of information / signal, it can transmit a wireless signal including the third piece of information / signal via the transceiver 206. Also, after the processor 202 receives a wireless signal including a fourth piece of information / signal via the transceiver 206, it can store the information obtained from the signal processing of the fourth piece of information / signal in the memory 204. The memory 204 can be connected to the processor 202 and can store various information related to the operation of the processor 202. For example, the memory 204 can execute some or all of the processes controlled by the processor 202 or store software code including instructions for implementing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor 202 and the memory 204 are part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 206 can be connected to the processor 202 and can transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 can include a transmitter and / or a receiver, and the transceiver 206 can be interchanged with an RF unit. In this disclosure, the wireless device can also mean a communication modem / circuit / chip.

[0290] Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. Without being limited thereto, one or more protocol layers can be implemented by one or more processors 102 and 202. For example, one or more processors 102 and 202 can implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102 and 202 can generate one or more PDUs (Protocol Data Units) and / or one or more SDUs (Service Data Units) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors 102 and 202 can generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors 102 and 202 can generate a signal (e.g., a baseband signal) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document and provide it to one or more transceivers 106 and 206. One or more processors 102 and 202 can receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document.

[0291] The one or more processors 102, 202 are referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 can be embodied by hardware, firmware, software, or combinations 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) can be included in the one or more processors 102, 202. The descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document can be embodied using firmware or software, and the firmware or software can be embodied to include modules, procedures, functions, etc. The descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document can be included in the one or more processors 102, 202 as firmware or software configured to execute, or stored in the one or more memories 104, 204 and driven by the one or more processors 102, 202. The descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document can be embodied using firmware or software in the form of code, instruction words, and / or sets of instruction words.

[0292] One or more memories 104, 204 can be coupled to one or more processors 102, 202 and can store various forms of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 can be composed of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer-readable storage medium, and / or combinations thereof. The one or more memories 104, 204 can be located inside and / or outside the one or more processors 102, 202. Also, the one or more memories 104, 204 can be coupled to the one or more processors 102, 202 via various techniques such as wired or wireless connections.

[0293] One or more transceivers 106, 206 can transmit user data, control information, radio signals / channels, etc. mentioned in the text, method, and / or operation flow diagram, etc. to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, radio signals / channels, etc. mentioned in the description, function, procedure, proposal, method, and / or operation flow diagram, etc. disclosed in this document from one or more other devices. For example, one or more transceivers 106, 206 can be connected to one or more processors 102, 202 and can transmit and receive radio signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or radio 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 radio signals from one or more other devices. Also, one or more transceivers 106, 206 can be connected to one or more antennas 108, 208 and can be configured to transmit and receive user data, control information, radio signals / channels, etc. mentioned in the description, function, procedure, proposal, method, and / or operation flow diagram, etc. disclosed in this document via one or more antennas 108, 208. In this document, one or more antennas are multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 can convert received radio signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, radio signals / channels, etc. using one or more processors 102, 202. One or more transceivers 106, 206 can convert user data, control information, radio signals / channels, etc. processed using one or more processors 102, 202 from baseband signals to RF band signals. For this purpose, one or more transceivers 106, 206 can include (analog) oscillators and / or filters.

[0294] FIG. 18 shows a signal processing circuit for a transmission signal according to an embodiment of the present disclosure.

[0295] Referring to FIG. 18, 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. 18 may be executed by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 17. The hardware elements of FIG. 18 may be implemented by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 17. For example, blocks 1010 to 1060 may be implemented by the processors 102, 202 of FIG. 17. Also, blocks 1010 to 1050 may be implemented by the processors 102, 202 of FIG. 17, and block 1060 may be implemented by the transceivers 106, 206 of FIG. 17.

[0296] The codeword can be converted into a radio signal through the signal processing circuit 1000 of FIG. 18. Here, the codeword is an encoded bit sequence of an information block. The information block may include a transmission block (e.g., a transmission block of UL-SCH, a transmission block of DL-SCH). The radio signal can be transmitted through various physical channels (e.g., PUSCH, PDSCH).

[0297] Specifically, the codeword can be converted into a bit sequence scrambled by the scrambler 1010. The scramble sequence used for scrambling is generated based on an initialization value, which can include ID information of the wireless device, etc. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 1020. The modulation method can 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 can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbols of each transmission layer can be mapped to the 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 the N*M precoding matrix W. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder 1040 can perform precoding after performing a transform precoding (e.g., DFT transform) on the complex modulation symbols. Also, the precoder 1040 can perform precoding without performing transform precoding.

[0298] The resource mapper 1050 can map the modulated symbols of each antenna port to time-frequency resources. The time-frequency resources 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 modulated symbols, and the generated radio signal can be transmitted to other devices via each antenna. For this purpose, the signal generator 1060 can include an IFFT (Inverse Fast Fourier Transform) module, a CP (Cyclic Prefix) inserter, a DAC (Digital-to-Analog Converter), a frequency uplink converter, etc.

[0299] In a wireless device, the signal processing process for a received signal can be configured as the reverse of the signal processing processes 1010 to 1060 in FIG. 18. For example, a wireless device (e.g., 100, 200 in FIG. 17) can receive a radio signal from the outside via an antenna port / transceiver. The received radio signal can be converted into a baseband signal via a signal restorer. For this purpose, the signal restorer can include a frequency downlink converter, an ADC (analog-to-digital converter), a CP remover, and an FFT (Fast Fourier Transform) module. Thereafter, the baseband signal can be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword can be restored to the original information block through decoding. Therefore, the signal processing circuit (not shown) for the received signal can include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0300] FIG. 19 shows a wireless device according to an embodiment of the present disclosure. The wireless device can be embodied in various forms depending on usage examples / services (see FIG. 16).

[0301] Referring to FIG. 19, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 17 and can be composed of various elements, components, units / parts, and / or modules. For example, the wireless devices 100 and 200 can include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit can include a communication circuit 112 and a transceiver(s) 114. For example, the communication circuit 112 can include one or more processors 102 and 202 and / or one or more memories 104 and 204 of FIG. 17. For example, the transceiver(s) 114 can include one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 of FIG. 17. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional elements 140 and controls various operations of the wireless device. For example, the control unit 120 can control the electrical / mechanical operations of the wireless device based on programs / codes / instructions / information stored in the memory unit 130. Also, the control unit 120 can transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via a wireless / wired interface through the communication unit 110, or store information received from the outside (e.g., other communication devices) via a wireless / wired interface through the communication unit 110 in the memory unit 130.

[0302] The additional element 140 can be configured in various ways depending on the type of wireless device. For example, the additional element 140 can include at least one of a power unit / battery, an input / output unit (I / O unit), a drive unit, and a computing unit. Without being limited thereto, the wireless device can be embodied in the form of a robot (100a in FIG. 16), a vehicle (100b-1, 100b-2 in FIG. 16), an XR device (100c in FIG. 16), a portable device (100d in FIG. 16), a home appliance (100e in FIG. 16), an IoT device (100f in FIG. 16), a digital broadcast 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. 167), a base station (200 in FIG. 16), a network node, etc. The wireless device can be movable or used at a fixed location depending on the usage example / service.

[0303] In FIG. 19, various elements, components, units / parts, and / or modules within the wireless devices 100 and 200 can be interconnected as a whole via a wired interface or at least partially wirelessly connected via the communication unit 110. For example, within the wireless devices 100 and 200, the control unit 120 and the communication unit 110 can be wired-connected, and the control unit 120 and the first unit (e.g., 130, 140) can be wirelessly connected via the communication unit 110. Also, each element, component, unit / part, and / or module within the wireless devices 100 and 200 can further include one or more elements. For example, the control unit 120 can be composed of a set of one or more processors. For example, the control unit 120 can be composed of a set including a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphic processing processor, a memory control processor, etc. As another example, the memory unit 130 can be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or combinations thereof.

[0304] Hereinafter, with reference to other drawings, a more detailed description will be given for the embodiment example of FIG. 19.

[0305] FIG. 20 shows a portable device according to an embodiment of the present disclosure. The portable device can include a smartphone, a smart pad, a wearable device (e.g., a smartwatch, smart glasses), a portable computer (e.g., a notebook, etc.). The portable device can be called an MS (Mobile Station), a UT (user terminal), an MSS (Mobile Subscriber Station), an SS (Subscriber Station), an AMS (Advanced Mobile Station), or a WT (Wireless terminal).

[0306] Referring to FIG. 20, the mobile 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 respectively correspond to blocks 110 to 130 / 140 in FIG. 19.

[0307] The communication unit 110 can transmit and receive signals (such as data, control signals, etc.) to and from other wireless devices and base stations. The control unit 120 can control the components of the mobile device 100 and execute various operations. The control unit 120 may include an AP (Application Processor). The memory unit 130 can store data / parameters / programs / codes / instructions necessary for driving the mobile device 100. Also, the memory unit 130 can store input / output data / information, etc. The power supply unit 140a can supply power to the mobile device 100 and may include a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support the connection of the mobile device 100 to other external devices. The interface unit 140b may include various ports for connection to external devices (such as audio input / output ports, video input / output ports). The input / output unit 140c can receive or output video information / signals, audio information / signals, data, and / or information input from the 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, etc.

[0308] As an example, in the case of data communication, the input / output unit 140c acquires information / signals (e.g., touch, text, voice, image, video) input by the user, and the acquired information / signals can be stored in the memory unit 130. The communication unit 110 converts the information / signals stored in the memory into wireless signals, and the converted wireless signals can be directly transmitted to other wireless devices or transmitted to a base station. Also, after receiving a wireless signal from another wireless device or a base station, the communication unit 110 can restore the received wireless signal to the original information / signals. The restored information / signals can be output in various forms (e.g., text, voice, image, video, haptic) via the input / output unit 140c after being stored in the memory unit 130.

[0309] FIG. 21 shows a vehicle or an autonomous driving vehicle according to an embodiment of the present disclosure. The vehicle or the autonomous driving vehicle can be embodied as a mobile robot, a vehicle, a train, an aerial vehicle (AV) with / without a pilot, a ship, etc.

[0310] Referring to FIG. 21, the vehicle or the autonomous driving vehicle 100 can include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 can be constituted as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d respectively correspond to blocks 110 / 130 / 140 in FIG. 19.

[0311] The communication unit 110 can transmit and receive signals (such as data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 can control elements of the vehicle or the autonomous driving vehicle 100 and execute various operations. The control unit 120 can include an ECU (Electronic Control Unit). The driving unit 140a can cause the vehicle or the autonomous driving vehicle 100 to travel 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 can supply power to the vehicle or the autonomous driving vehicle 100 and can include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can obtain vehicle state, surrounding environment information, user information, etc. The sensor unit 140c can include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement technologies such as maintaining the lane during driving, automatically adjusting the speed like adaptive cruise control, automatically driving along a determined route, and automatically setting and driving along a route when a destination is set.

[0312] As an example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving route and a driving plan based on the acquired data. The control unit 120 can 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 (for example, speed / direction adjustment). During autonomous driving, the communication unit 110 can non-periodically acquire the latest traffic information data from an external server and acquire the surrounding traffic information data from surrounding vehicles. Also, during autonomous driving, the sensor unit 140c can acquire vehicle state and surrounding environment information. The autonomous driving unit 140d can update the autonomous driving route and the driving plan based on the newly acquired data / information. The communication unit 110 can transmit information regarding the vehicle position, the autonomous driving route, the driving plan, etc. to the external server. The external server can predict traffic information data in advance using AI technology, etc. based on the 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.

[0313] The claims described in this specification can be combined in various ways. For example, the technical features of the method claims in this specification can be combined and implemented in an apparatus, and the technical features of the apparatus claims in this specification can be combined and implemented in a method. Also, the technical features of the method claims in this specification and the technical features of the apparatus claims can be combined and implemented in an apparatus, and the technical features of the method claims in this specification and the technical features of the apparatus claims can be combined and implemented in a method.

Claims

1. In the method by the first device, selecting at least one sidelink resource; transmitting SCI (sidelink control information) to a second device based on a PSCH (physical sidelink control channel) resource included in the selected at least one sidelink resource, wherein the SCI includes information related to the position of the next resource in chronological order regarding the PSCH resource; receiving, from the second device, a feedback channel including collision information which is information regarding the existence of a resource collision in the next resource in the chronological order regarding the PSCH resource; determining the resource collision based on the collision information; reselecting a resource based on the resource collision, wherein the resource is reselected based on the resource collision from sidelink resources excluding the next resource in the chronological order regarding the PSCH resource.

2. The method according to claim 1, wherein the SCI further includes a resource reservation period.

3. The method according to claim 2, wherein the next resource in the chronological order regarding the PSCH resource is the first resource in a resource pool after the PSCH resource.

4. The method according to claim 1, wherein the next resource in the chronological order regarding the PSCH resource is a resource after the number of slots in the resource pool from the PSCH resource.

5. The method according to claim 1, wherein the SCI does not include a resource reservation period.

6. The method according to claim 5, wherein the next resource in the chronological order regarding the PSCH resource is the first resource in a resource pool after the PSCH resource.

7. The method according to claim 1, wherein the collision information is generated based on decoding of SCI transmitted by a third device.

8. The method according to claim 7, wherein the collision information is generated based on interference related to resources used by the third device for transmitting a MAC (medium access control) PDU (protocol data unit).

9. The method according to claim 1, wherein the next resource in the chronological order related to the PSCCH resource is a resource related to one MAC PDU.

10. The method according to claim 1, wherein the reselection is performed based on the existence of a MAC PDU transmitted in the next resource in the chronological order related to the PSCCH resource.

11. The method according to claim 10, wherein the existence of the MAC PDU is determined based on the existence of priority information related to the MAC PDU.

12. One or more processors; One or more transceivers; One or more memories connected to the one or more processors and the one or more transceivers and storing instructions for performing operations, wherein the operations include selecting at least one sidelink resource; transmitting SCI (sidelink control information) to a second device based on a PSCCH (physical sidelink control channel) resource included in the selected at least one sidelink resource, wherein the SCI includes information related to the position of the next resource in the chronological order related to the PSCCH resource; receiving, from the second device, collision information included in a feedback channel, which is information related to the existence of a resource collision in the next resource in the chronological order related to the PSCCH resource; determining the resource collision based on the collision information; reselection of a resource based on the resource collision, wherein the resource is reselected based on the resource collision from sidelink resources excluding the next resource in the chronological order related to the PSCCH resource, a first device.

13. In a processing device adapted to control a first device, one or more processors; one or more memories operably connectable to the one or more processors and storing instructions for performing operations, wherein the operations include selecting at least one sidelink resource; Transmitting SCI (sidelink control information) to a second device based on a PSCH (physical sidelink control channel) resource included in at least one selected sidelink resource, wherein the SCI includes information related to the position of the next resource in chronological order with respect to the PSCH resource; Receiving, from the second device, a feedback channel including collision information which is information regarding the presence of a resource collision in the next resource in the chronological order with respect to the PSCH resource; Determining the resource collision based on the collision information; Re-selecting a resource based on the resource collision, and The resource is re-selected based on the resource collision from sidelink resources excluding the next resource in the chronological order with respect to the PSCH resource, a processing device.

Images