Method and apparatus for transmitting and receiving information relating to conflicts of reserved resources in a wireless communication system - Patents.com

Abstract

In a wireless communication system according to one embodiment of the present specification, a method for a first terminal to transmit information regarding a collision of reserved resources includes steps of receiving a first SCI related to a first reserved resource for a PSSCH from a second terminal, receiving a second SCI related to a second reserved resource for a PSSCH from three terminals, determining a collision between the first reserved resource and the second reserved resource, and transmitting information regarding the collision to the second terminal or the third terminal.

Description

[Technical Field]

[0001] The present specification relates to a method and apparatus for transmitting and receiving information regarding collisions of reserved resources in a wireless communication system. [Background technology]

[0002] Wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.) Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and multi carrier frequency division multiple access (MC-FDMA) systems.

[0003] Sidelink (SL) is a communication method that establishes a direct link between terminals (User Equipment, UE) to directly exchange voice or data between terminals without going through a base station (BS). SL is considered as one solution to alleviate the burden on base stations due to the rapidly increasing data traffic.

[0004] V2X (vehicle-to-everything) refers to a communication technology that exchanges information with other vehicles, pedestrians, and infrastructure-based objects via wired or wireless communication. V2X is divided into four types: V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X communication is provided via the PC5 interface and / or Uu interface.

[0005] Meanwhile, as more communication devices require larger communication capacities, there is a growing need for improved mobile broadband communication compared to existing radio access technologies (RATs). Accordingly, communication systems that take into account reliability- and latency-sensitive services or terminals are being discussed. Next-generation radio access technologies that take into account improved mobile broadband communication, massive machine-type communication (MTC), and ultra-reliable and low latency communication (URLLC) can be called new radio access technologies (RATs) or new radios (NRs). NRs can also support vehicle-to-everything (V2X) communication.

[0006] Two schemes are considered for the inter-UE coordination mechanism. In scheme 1, UE-A provides UE-B with a set of resources that can be used for UE-B's resource (re)selection procedure. In scheme 2, UE-A provides UE-B with resource conflict-related information for resources indicated by UE-B's Sidelink Control Information (SCI). UE-B can avoid resource conflicts by reselecting some of the resources indicated by UE-B's SCI.

[0007] Meanwhile, the threshold for RSRP measurement based on SCI format 1-A performed by the UE may be determined based on a combination of transmission priority and reception priority. In this case, the reception priority may be determined as the priority of the received SCI format 1-A, and the transmission priority may be determined as the priority of the TB transmitted by the corresponding UE. In one example, the index for selecting one of the RSRP thresholds in the RSRP list is the reception priority value + (transmission priority value - 1). * It can be determined as 8. Summary of the Invention [Problem to be solved by the invention]

[0008] Regarding scheme 2 for inter-UE coordination, the following problems may arise:

[0009] The RSRP measurement and the RSRP threshold are used to determine whether the reserved resources collide.

[0010] According to the prior art, when two reserved resources (UE-B, UE-C) are overlapped in the time and frequency domains, it is unclear whether UE-A uses the RSRP measured from the SCI of a certain terminal (SCI format 1-A) to compare with the RSRP threshold. That is, whether or not the reserved resources collide may be determined differently depending on whether UE-A uses the RSRP measured from the SCI of UE-B or the RSRP measured from the SCI of UE-C.

[0011] Also, as described above, depending on the setting of the transmission priority value, the RSRP threshold to be used may vary greatly, and whether or not a resource conflict occurs may be determined differently. In the prior art, it is not clear how to set the transmission priority value for determining the RSRP threshold, so it may be difficult to guarantee the accuracy of whether or not a reserved resource conflict occurs.

[0012] If it is determined that the reserved resources collide based on the determined RSRP threshold, it is necessary to determine the target terminals to which the conflict information is to be transmitted. For example, if the conflict information is transmitted to all terminals that transmitted the first SCI (first stage SCI) related to each reserved resource, resource reselection for all terminals must be performed, which is inefficient. For example, if the conflicting resource is transmitted to any terminal among the terminals that transmitted the first SCI, the terminal that performs transmission with higher importance may have to reselect the resource.

[0013] The purpose of this document is to propose a method for solving the aforementioned problems.

[0014] The technical problems to be solved in this specification are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0015] In a wireless communication system according to an embodiment of the present specification, a method for a first terminal to transmit information regarding a conflict of reserved resources includes the steps of receiving first Sidelink Control Information (SCI) related to first reserved resources for a Physical Sidelink Shared Channel (PSSCH) from a second terminal, receiving second SCI related to second reserved resources for a PSSCH from a third terminal, determining a conflict between the first reserved resources and the second reserved resources, and transmitting information regarding the conflict to the second terminal or the third terminal.

[0016] The collision is determined based on i) a measured Reference Signal Received Power (RSRP) and ii) an RSRP threshold.

[0017] The measured RSRP is an RSRP measured based on the first SCI or an RSRP measured based on the second SCI.

[0018] The measured RSRP is determined based on whether the first terminal is an intended receiver associated with the PSSCH of the second terminal or not, and whether the first terminal is an intended receiver associated with the PSSCH of the third terminal.

[0019] The first SCI and the second SCI may be received over a physical sidelink control channel (PSCCH).

[0020] The RSRP threshold may be determined based on a reception priority value and a transmission priority value. Based on the first terminal being an intended receiver of the PSSCH associated with the third terminal, the collision may be determined based on the RSRP measured based on the first SCI and the RSRP threshold, and the RSRP threshold may be determined based on a first priority value of the first SCI set to the reception priority value and a second priority value of the second SCI set to the transmission priority value.

[0021] The RSRP threshold may be determined based on a reception priority value and a transmission priority value. Based on the first terminal being an intended receiver of a PSSCH associated with a second terminal, the collision may be determined based on the RSRP measured based on the second SCI and the RSRP threshold, and the RSRP threshold may be determined based on a second priority value of the second SCI set to the reception priority value and a first priority value of the first SCI set to the transmission priority value.

[0022] Based on the first priority value being greater than the second priority value, information about the collision may be transmitted to the second terminal.

[0023] Based on the second priority value being greater than the first priority value, information about the collision may be transmitted to the third terminal.

[0024] Based on the first priority value and the second priority value being equal, the information about the collision may be transmitted to the second terminal or the third terminal.

[0025] The measured RSRP may include RSRP measured based on a demodulation reference signal for a physical sidelink control channel (PSCCH DMRS) and / or a demodulation reference signal for a physical sidelink shared channel (PSSCH DMRS).

[0026] The collision-related information may be transmitted based on a Physical Sidelink Feedback Channel (PSFCH).

[0027] The resources for transmission of the PSFCH may be pre-configured or configured by the base station.

[0028] In another embodiment of the present specification, a first terminal for transmitting information regarding collisions of reserved resources in a wireless communication system includes one or more transceivers, one or more processors for controlling the one or more transceivers, and one or more memories operably connected to the one or more processors.

[0029] The one or more memories store instructions for performing operations upon being executed by the one or more processors.

[0030] The operations include receiving first Sidelink Control Information (SCI) related to first reserved resources for a Physical Sidelink Shared Channel (PSSCH) from a second terminal, receiving second SCI related to second reserved resources for a PSSCH from a third terminal, determining a conflict between the first reserved resources and the second reserved resources, and transmitting information related to the conflict to the second terminal or the third terminal.

[0031] The collision is determined based on i) a measured Reference Signal Received Power (RSRP) and ii) an RSRP threshold.

[0032] The measured RSRP is RSRP measured based on the first SCI or RSRP measured based on the second SCI.

[0033] The measured RSRP is determined based on whether the first terminal is an intended receiver associated with a PSSCH of the second terminal, or whether the first terminal is an intended receiver associated with a PSSCH of the third terminal.

[0034] In a wireless communication system according to another embodiment of the present specification, an apparatus for controlling a first terminal to transmit information regarding collisions of reserved resources includes one or more processors and one or more memories operably connected to the one or more processors.

[0035] The one or more memories store instructions that perform operations upon being executed by the one or more processors.

[0036] The operations include receiving first Sidelink Control Information (SCI) related to first reserved resources for a Physical Sidelink Shared Channel (PSSCH) from a second terminal, receiving second SCI related to second reserved resources for a PSSCH from a third terminal, determining a conflict between the first and second reserved resources, and transmitting information related to the conflict to the second terminal or the third terminal.

[0037] The collision is determined based on i) a measured Reference Signal Received Power (RSRP) and ii) an RSRP threshold.

[0038] The measured RSRP is RSRP measured based on the first SCI or RSRP measured based on the second SCI.

[0039] The measured RSRP is determined based on whether the first terminal is an intended receiver associated with the PSSCH of the second terminal or not, or whether the first terminal is an intended receiver associated with the PSSCH of the third terminal.

[0040] According to other embodiments of the present disclosure, one or more non-transitory () computer-readable media store one or more instructions.

[0041] The one or more instructions perform operations upon being executed by one or more processors.

[0042] The operations include receiving first Sidelink Control Information (SCI) related to first reserved resources for a Physical Sidelink Shared Channel (PSSCH) from a second terminal and receiving second SCI related to second reserved resources for a PSSCH from a third terminal; determining a conflict between the first reserved resources and the second reserved resources; and transmitting information related to the conflict to the second terminal or the third terminal.

[0043] The collision is determined based on i) a measured Reference Signal Received Power (RSRP) and ii) an RSRP threshold.

[0044] The measured RSRP is an RSRP measured based on the first SCI or an RSRP measured based on the second SCI.

[0045] The measured RSRP is determined based on whether the first terminal is an intended receiver associated with the PSSCH of the second terminal, or whether the first terminal is an intended receiver associated with the PSSCH of the third terminal.

[0046] In a wireless communication system according to another embodiment of the present specification, a method for a second terminal to receive information regarding a conflict of reserved resources includes the steps of transmitting first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH) to a first terminal, and receiving information regarding a conflict between the first reserved resources and a second reserved resource from the first terminal.

[0047] The second reserved resource is associated with a second SCI for a PSSCH of the third terminal, and the collision is determined by the first terminal based on i) a Reference Signal Received Power (RSRP) measured by the first terminal and ii) an RSRP threshold.

[0048] The measured RSRP is an RSRP measured based on the first SCI or an RSRP measured based on the second SCI.

[0049] The measured RSRP is determined based on whether the first terminal is an intended receiver associated with the PSSCH of the second terminal, or whether the first terminal is an intended receiver associated with the PSSCH of the third terminal.

[0050] The method may further include performing resource reselection for the PSSCH based on information related to the collision.

[0051] In accordance with another embodiment of the present specification, a second terminal for receiving a physical sidelink feedback channel (PSFCH) in a wireless communication system includes one or more transceivers, one or more processors for controlling the one or more transceivers, and one or more memories operably connected to the one or more processors.

[0052] The one or more memories store instructions that perform operations upon being executed by the one or more processors.

[0053] The operations include transmitting, to a first terminal, first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH); and receiving, from the first terminal, information regarding a conflict between the first reserved resources and second reserved resources.

[0054] The second reserved resource is associated with a second SCI for a PSSCH of the third terminal, and the collision is determined by the first terminal based on i) a Reference Signal Received Power (RSRP) measured by the first terminal and ii) an RSRP threshold.

[0055] The measured RSRP is an RSRP measured based on the first SCI or an RSRP measured based on the second SCI.

[0056] The measured RSRP is determined based on whether the first terminal is an intended receiver associated with the PSSCH of the second terminal, or whether the first terminal is an intended receiver associated with the PSSCH of the third terminal. [Effects of the Invention]

[0057] According to an embodiment of the present specification, the RSRP measurement target for determining a collision of reserved resources may be determined differently depending on whether the first terminal is an intended receiver of the PSSCH of the second terminal or an intended receiver of the PSSCH of the third terminal. Therefore, an RSRP measurement value that is more suitable for whether resources collide may be used.

[0058] According to the embodiments of the present specification, the transmission / reception priority value for the RSRP threshold is determined based on the receiving terminals associated with the overlapping reserved resources, and thus, an RSRP threshold suitable for determining whether or not there is a resource conflict can be used.

[0059] According to the above-described embodiment, the accuracy of determining whether or not a resource conflict exists can be improved, and the efficiency of inter-terminal coordination operations based on conflict information can be improved.

[0060] According to an embodiment of the present specification, conflict information is transmitted to a terminal with a low priority (high priority value), and only terminals with a low priority among terminals scheduled for each of the overlapped reserved resources are allowed to reselect resources, thereby improving the efficiency of resource reselection and protecting the transmission of terminals with a high priority.

[0061] The effects obtained in this specification are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which this specification pertains from the following description. [Brief explanation of the drawings]

[0062] The accompanying drawings, which are included as part of the detailed description to aid in understanding the present specification, provide embodiments to the present specification and, together with the detailed description, explain the technical features of the present specification.

[0063] [Figure 1] 1 illustrates the structure of an NR system according to one embodiment of the present specification. [Figure 2] 1 illustrates the structure of a radio frame for NR according to one embodiment of the present specification. [Figure 3] 1 illustrates a slot structure of an NR frame according to one embodiment of the present specification. [Figure 4] 1 illustrates a terminal performing V2X or SL communication according to an embodiment of the present specification. [Figure 5] 1 illustrates a resource unit for V2X or SL communication according to an embodiment herein. [Figure 6] According to an embodiment of the present specification, a procedure for a terminal to perform V2X or SL communication depending on a transmission mode will be described. [Figure 7] 1 shows three cast types according to one embodiment of the present disclosure. [Figure 8] 1 illustrates multiple BWPs according to an embodiment of the present disclosure. [Figure 9] 1 illustrates a BWP according to an embodiment of the present disclosure. [Figure 10] 1 illustrates a resource unit for CBR measurement according to an embodiment herein. [Figure 11] FIG. 1 illustrates a resource pool associated with CBR measurement. [Figure 12] According to one embodiment of this specification, a procedure for UE-A to send assistance information to UE-B is shown. [Figure 13] 10 is a flowchart illustrating a method in which a first terminal transmits information regarding collision of reserved resources in a wireless communication system according to an embodiment of the present specification. [Figure 14]10 is a flowchart illustrating a method for a second terminal to receive information regarding collision of reserved resources in a wireless communication system according to another embodiment of the present specification. [Figure 15] 1 illustrates a communication system 1 according to an embodiment of the present disclosure. [Figure 16] 1 illustrates a wireless device according to an embodiment of the present disclosure. [Figure 17] 1 illustrates a signal processing circuit for a transmit signal according to an embodiment of the present disclosure. [Figure 18] 1 illustrates a wireless device according to an embodiment of the present disclosure. [Figure 19] 1 illustrates a mobile device according to an embodiment of the present disclosure. [Figure 20] 1 illustrates a vehicle or autonomous vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0064] In various embodiments herein, " / " and "," should be interpreted as meaning "and / or." For example, "A / B" may mean "A and / or B." Furthermore, "A, B" may mean "A and / or B." Furthermore, "A / B / C" may mean "at least one of A, B, and / or C." Furthermore, "A, B, C" may mean "at least one of A, B, and / or C."

[0065] In various embodiments herein, "or" should be interpreted as meaning "and / or." For example, "A or B" includes "A only," "B only," and / or "both A and B." In other words, "or" should be interpreted as meaning "additionally or alternatively."

[0066] The following technologies can be used in various wireless communication systems, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA). CDMA can be implemented in wireless technologies such as universal terrestrial radio access (UTRA) and CDMA2000. TDMA can be implemented in wireless technologies such as global system for mobile communications (GSM), general packet radio service (GPRS), and enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented in wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (3rd generation partnership project) long term evolution (LTE) employs OFDMA in the downlink and SC-FDMA in the uplink as part of evolved UMTS (E-UMTS) which uses evolved-UMTS terrestrial radio access (E-UTRA).LTE-A (advanced) is an evolution of 3GPP LTE.

[0067] 5G NR is a successor technology to LTE-A and is a new clean-slate mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, including low-frequency bands below 1 GHz, intermediate-frequency bands between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz.

[0068] For clarity of explanation, the description will focus on LTA-A or 5G NR, but the technical idea according to an embodiment of this specification is not limited thereto.

[0069] The Radio Interface Protocol layers between a terminal and a network are divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3), based on the bottom three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. Of these, the physical layer, which belongs to Layer 1, provides information transfer services using physical channels, and the Radio Resource Control (RRC) layer, located in Layer 3, controls radio resources between the terminal and the network. To achieve this, the RRC layer exchanges RRC messages between the terminal and the base station.

[0070] The MAC layer provides services to the upper layer, the radio link control (RLC) layer, via logical channels. The MAC layer provides a mapping function from multiple logical channels to multiple transmission channels. The MAC layer also provides a logical channel multiplexing function by mapping multiple logical channels to a single transmission channel. The MAC sublayer provides data transmission services on the logical channels.

[0071] The RLC layer performs concatenation, segmentation, and reassembly of RLC SDUs (Service Data Units). To guarantee various Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three operation modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction using automatic repeat request (ARQ).

[0072] The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transmission channels, and physical channels in relation to the configuration, reconfiguration, and release of radio bearers. RB refers to the logical path provided by layer 1 (physical layer or PHY layer) and layer 2 (MAC layer, RLC layer, PDCP (Packet Data Convergence Protocol) layer) for data transmission between the terminal and the network.

[0073] The functions of the PDCP layer in the user plane include transmission of user data, header compression, and ciphering, while the functions of the PDCP layer in the control plane include transmission of control plane data and encryption / integrity protection.

[0074] RB configuration refers to the process of defining the characteristics of radio protocol layers and channels to provide specific services, and setting their specific parameters and operation methods. RBs are further divided into two types: SRBs (Signaling Radio Bearers) and DRBs (Data Radio Bearers). SRBs are used as paths for transmitting RRC messages in the control plane, and DRBs are used as paths for transmitting user data in the user plane.

[0075] When an RRC connection is established between the RRC layer of the terminal and the RRC layer of the E-UTRAN, the terminal is in the RRC_CONNECTED state; otherwise, it is in the RRC_IDLE state. In the case of NR, the RRC_INACTIVE state is additionally defined, and a terminal in the RRC_INACTIVE state maintains its connection with the core network but can release its connection with the base station.

[0076] Downlink transmission channels for transmitting data from a network to a terminal include a BCH (Broadcast Channel) for transmitting system information and a downlink SCH (Shared Channel) for transmitting user traffic and control messages. Traffic or control messages of downlink multicast or broadcast services may be transmitted via the downlink SCH or via a separate downlink MCH (Multicast Channel). Meanwhile, uplink transmission channels for transmitting data from a terminal to a network include a RACH (Random Access Channel) for transmitting initial control messages and an uplink SCH (Shared Channel) for transmitting user traffic and control messages.

[0077] Logical channels that are located above transmission channels and are mapped to transmission channels include BCCH (Broadcast Control Channel), PCCH (Common Control Channel), MCCH (Multicast Control Channel), and MTCH (Multicast Traffic Channel).

[0078] A physical channel consists of multiple OFDM symbols in the time domain and multiple subcarriers in the frequency domain. One subframe consists of multiple OFDM symbols in the time domain. A resource block is a resource allocation unit and consists of multiple OFDM symbols and multiple subcarriers. In addition, each subframe can use a specific subcarrier of a specific OFDM symbol (e.g., the first OFDM symbol) for the Physical Downlink Control Channel (PDCCH), i.e., the L1 / L2 control channel. A Transmission Time Interval (TTI) is the unit time for subframe transmission.

[0079] FIG. 1 illustrates the structure of an NR system according to one embodiment of the present specification.

[0080] Referring to FIG. 1, a Next Generation Radio Access Network (NG-RAN) includes a next generation Node B (gNB) and / or eNB that provide user plane and control plane protocol termination for a terminal. FIG. 1 illustrates a case where only a gNB is included. The gNB and eNB are connected to each other via an Xn interface. The gNB and eNB are connected to a 5th generation core network (5G Core Network: 5GC) via an NG interface. More specifically, they are connected to an access and mobility management function (AMF) via an NG-C interface and to a user plane function (UPF) via an NG-U interface.

[0081] FIG. 2 illustrates a structure of a radio frame for NR according to one embodiment of the present specification.

[0082] Referring to Figure 2, radio frames can be used for uplink and downlink transmission in NR. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HF). A half-frame includes five 1 ms subframes (SF). A subframe is divided into one or more slots, and the number of slots within a subframe can be determined according to the subcarrier spacing (SCS). Each slot includes 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP).

[0083] When normal CP is used, each slot contains 14 symbols. When extended CP is used, each slot contains 12 symbols. Here, the symbols include OFDM symbols (or CP-OFDM symbols) and SC-FDMA (Single Carrier-FDMA) symbols (or DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) symbols).

[0084] Table 1 below shows the number of symbols per slot (N) depending on the SCS setting (u) when a normal CP is used. slot symb ), number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot ) is shown below.

[0085] [Table 1]

[0086] Table 2 shows examples of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS when an extended CP is used.

[0087] [Table 2]

[0088] In an NR system, multiple cells merged into one terminal can be configured to have different OFDM(A) numerologies (e.g., SCS, CP length, etc.), which allows the (absolute time) duration of time resources (e.g., subframes, slots, or TTIs) (commonly referred to as TUs (Time Units) for convenience) consisting of the same number of symbols to be different between the merged cells.

[0089] NR supports multiple numerologies or SCSs to support various 5G services. For example, a 15 kHz SCS supports wide areas in traditional cellular bands, while a 30 kHz / 60 kHz SCS supports dense urban areas, lower latency, and wider carrier bandwidths. A 60 kHz or higher SCS supports bandwidths greater than 24.25 GHz to overcome phase noise.

[0090] The NR frequency band can be defined as two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The numerical values ​​of the frequency ranges may be changed, and for example, the two types of frequency ranges are as shown in Table 3 below. Of the frequency ranges used in the NR system, FR1 means the "sub 6 GHz range" and FR2 means the "above 6 GHz range" and may also be called millimeter wave (mmW).

[0091] [Table 3]

[0092] As mentioned above, the numerical values ​​of the frequency ranges of the NR system can be changed. For example, FR1 includes the band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 includes frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included in FR1 include unlicensed bands. Unlicensed bands can be used for various purposes, such as communications for vehicles (e.g., autonomous driving).

[0093] [Table 4]

[0094] FIG. 3 illustrates a slot structure of an NR frame according to one embodiment of the present specification.

[0095] 3, a slot includes multiple symbols in the time domain. For example, in the case of the normal CP, one slot includes 14 symbols, but in the case of the extended CP, one slot includes 12 symbols. Alternatively, in the case of the normal CP, one slot includes 7 symbols, but in the case of the extended CP, one slot includes 6 symbols.

[0096] A carrier includes multiple subcarriers in the frequency domain. A Resource Block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) is defined as multiple (P) Physical Resource Blocks (RBs) in the frequency domain, and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier includes up to N (e.g., 5) BWPs. Data communication can be performed via activated BWPs. Each element may be called a Resource Element (RE) in the resource grid, and one complex symbol can be mapped to it.

[0097] Meanwhile, a radio interface between terminals or a radio interface between a terminal and a network is composed of an L1 layer, an L2 layer, and an L3 layer. In various embodiments herein, the L1 layer may refer to a physical layer. For example, the L2 layer may refer to at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. For example, the L3 layer may refer to an RRC layer.

[0098] Sidelink Synchronization Signal (SLSS) and synchronization information

[0099] The SLSS is a SL-specific sequence and includes a Primary Sidelink Synchronization Signal (PSSS) and a Secondary Sidelink Synchronization Signal (SSSS). The PSSS may be referred to as a Sidelink Primary Synchronization Signal (S-PSS), and the SSSS may be referred to as a Sidelink Secondary Synchronization Signal (S-SSS). For example, length-127 M-sequences are used for the S-PSS, and length-127 Gold sequences are used for the S-SSS. For example, a terminal can perform initial signal detection and acquire synchronization using the S-PSS. For example, a terminal can acquire detailed synchronization and detect a synchronization signal ID using the S-PSS and S-SSS.

[0100] The PSBCH (Physical Sidelink Broadcast Channel) may be a (broadcast) channel that transmits basic (system) information that a terminal should first know before transmitting or receiving an SL signal. For example, the basic information may be information about SLSS, duplex mode (DM), TDD UL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool-related information, type of application related to SLSS, subframe offset, broadcast information, etc. For example, for evaluation of PSBCH performance, in NRV2X, the payload size of the PSBCH may be 56 bits including a 24-bit CRC.

[0101] The S-PSS, S-SSS, and PSBCH are included in a block format (e.g., an SLSS (Synchronization Signal) / PSBCH block, hereinafter referred to as an S-SSB (Sidelink-Synchronization Signal Block)) that supports periodic transmission. The S-SSB may have the same numerology (i.e., SCS and CP length) as the PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) in a carrier, and the transmission bandwidth may be within a (pre-set) configured SL BWP (Sidelink BWP). For example, the bandwidth of the S-SSB may be 11 RBs (Resource Blocks). For example, the PSBCH may span 11 RBs. The frequency location of the S-SSB may be (pre-set). Therefore, the terminal does not need to perform hypothesis detection in frequency to find the S-SSB in the carrier.

[0102] Meanwhile, in an NR SL system, multiple numerologies with different SCSs and / or CP lengths can be supported. In this case, as the SCS increases, the length of the time resource over which the transmitting terminal transmits the S-SSB decreases. This reduces the coverage of the S-SSB. Therefore, to ensure S-SSB coverage, the transmitting terminal can transmit one or more S-SSBs to the receiving terminal within one S-SSB transmission period according to the SCS. For example, the number of S-SSBs that the transmitting terminal transmits to the receiving terminal within one S-SSB transmission period can be pre-configured or configured in the transmitting terminal. For example, the S-SSB transmission period is 160 ms. For example, an S-SSB transmission period of 160 ms can be supported for all SCSs.

[0103] For example, if the SCS is 15 kHz in FR1, the transmitting terminal can transmit one or two S-SSBs to the receiving terminal within one S-SSB transmission period. For example, if the SCS is 30 kHz in FR1, the transmitting terminal can transmit one or two S-SSBs to the receiving terminal within one S-SSB transmission period. For example, if the SCS is 60 kHz in FR1, the transmitting terminal can transmit one, two, or four S-SSBs to the receiving terminal within one S-SSB transmission period.

[0104] For example, if the SCS is 60 kHz in FR2, the transmitting terminal can transmit 1, 2, 4, 8, 16, or 32 S-SSBs to the receiving terminal within one S-SSB transmission period. For example, if the SCS is 120 kHz in FR2, the transmitting terminal can transmit 1, 2, 4, 8, 16, 32, or 64 S-SSBs to the receiving terminal within one S-SSB transmission period.

[0105] Meanwhile, when the SCS is 60 kHz, two types of CPs can be supported. The structure of the S-SSB transmitted from the transmitting terminal to the receiving terminal varies depending on the CP type. For example, the CP type is a normal CP (NCP) or an extended CP (ECP). Specifically, for example, when the CP type is NCP, the number of symbols to which the PSBCH is mapped within the S-SSB transmitted from the transmitting terminal can be 9 or 8. On the other hand, when the CP type is ECP, the number of symbols to which the PSBCH is mapped within the S-SSB transmitted from the transmitting terminal can be 8 or 6. For example, the PSBCH can be mapped to the first symbol within the S-SSB transmitted from the transmitting terminal. For example, a receiving terminal receiving an S-SSB can perform an automatic gain control (AGC) operation during the first symbol period of the S-SSB.

[0106] FIG. 4 illustrates a terminal performing V2X or SL communication according to an embodiment of the present specification.

[0107] Referring to Figure 4, in V2X or SL communication, the term "terminal" mainly refers to a user's terminal. However, when network equipment such as a base station transmits and receives signals according to a communication method between terminals, the base station may also be considered a type of terminal. For example, terminal 1 is a first device 100, and terminal 2 is a second device 200.

[0108] For example, terminal 1 can select a resource unit corresponding to a specific resource in a resource pool, which means a collection of resources. Then, terminal 1 can transmit an SL signal using the resource unit. For example, terminal 2, which is a receiving terminal, can be configured with a resource pool to which terminal 1 can transmit a signal and can detect the signal of terminal 1 in the resource pool.

[0109] Here, when the terminal 1 is within the connection range of the base station, the base station can inform the terminal 1 of a resource pool. On the other hand, when the terminal 1 is outside the connection range of the base station, another terminal can inform the terminal 1 of a resource pool, or the terminal 1 can use a pre-configured resource pool.

[0110] Generally, a resource pool is composed of multiple resource units, and each terminal selects one or more resource units to use for its SL signal transmission.

[0111] FIG. 5 illustrates a resource unit for V2X or SL communication according to an embodiment herein.

[0112] Referring to FIG. 5, the total frequency resources of the resource pool are N F The total time resources of the resource pool are divided into N T Therefore, there are a total of N F *N T 5 shows a resource pool in which N resource units can be defined. TAn example in which the period is repeated at a period of subframes is shown.

[0113] As shown in Figure 5, one resource unit (e.g., Unit #0) appears repeatedly periodically. Alternatively, to obtain a diversity effect in the time or frequency dimension, the index of the physical resource unit to which one logical resource unit is mapped can change in a predetermined pattern over time. In this resource unit structure, a resource pool refers to a collection of resource units that a terminal wishing to transmit an SL signal can use for transmission.

[0114] The resource pools are subdivided into several types. For example, the resource pools are divided into the following types according to the content of the SL signals transmitted in each resource pool:

[0115] (1) A Scheduling Assignment (SA) is a signal containing information such as the location of resources used by a transmitting terminal to transmit an SL data channel, as well as information such as a Modulation and Coding Scheme (MCS) or a Multiple Input Multiple Output (MIMO) transmission method, and a Timing Advance (TA) required for demodulating the data channel. The SA can be multiplexed and transmitted together with SL data on the same resource unit. In this case, the SA resource pool refers to a resource pool in which the SA is multiplexed and transmitted together with the SL data. The SA may also be called an SL control channel.

[0116] (2) The SL data channel (Physical Sidelink Shared Channel, PSSCH) is a resource pool used by a transmitting terminal to transmit user data. If SA is multiplexed and transmitted together with SL data on the same resource unit, only the SL data channel excluding SA information can be transmitted in the resource pool for the SL data channel. That is, REs (Resource Elements) used to transmit SA information on individual resource units in the SA resource pool can still be used to transmit SL data in the resource pool for the SL data channel. For example, the transmitting terminal can map PSSCH to consecutive PRBs and transmit them.

[0117] (3) A discovery channel can be a resource pool for a transmitting terminal to transmit information such as its ID, allowing neighboring terminals to discover it.

[0118] Even when the contents of the SL signals described above are the same, different resource pools can be used according to the transmission and reception attributes of the SL signals. For example, even if the same SL data channel or discovery message is used, it can be divided into different resource pools according to the method of determining the transmission timing of the SL signal (e.g., whether it is transmitted at the time of receiving a synchronization reference signal or whether it is transmitted with a certain timing advance applied at the time of receiving), the method of resource allocation (e.g., whether the base station assigns transmission resources for individual signals to individual transmitting terminals or whether individual transmitting terminals themselves select individual signal transmission resources within a resource pool), the signal format (e.g., the number of symbols each SL signal occupies in one subframe or the number of subframes used to transmit one SL signal), the signal strength from the base station, the transmission power strength of the SL terminal, etc.

[0119] Resource Allocation in SL

[0120] 6 illustrates a procedure in which a terminal performs V2X or SL communication according to a transmission mode according to an embodiment of this specification. In various embodiments of this specification, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for convenience of explanation, a transmission mode in LTE may be referred to as an LTE transmission mode, and a transmission mode in NR may be referred to as an NR resource allocation mode.

[0121] For example, (a) of Figure 6 illustrates terminal operation associated with LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, (a) of Figure 6 illustrates terminal operation associated with NR resource allocation mode 1. For example, LTE transmission mode 1 is applicable to general SL communication, and LTE transmission mode 3 is applicable to V2X communication.

[0122] For example, (b) of FIG. 6 illustrates terminal operation associated with LTE transmission mode 2 or LTE transmission mode 4. Or, for example, (b) of FIG. 6 illustrates terminal operation associated with NR resource allocation mode 2.

[0123] 6(a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, a base station schedules SL resources to be used by a terminal for SL transmission. For example, the base station may perform resource scheduling for terminal 1 via a PDCCH (more specifically, Downlink Control Information (DCI)), and terminal 1 performs V2X or SL communication with terminal 2 through the resource scheduling. For example, terminal 1 transmits Sidelink Control Information (SCI) to terminal 2 via a Physical Sidelink Control Channel (PSCCH), and then transmits data based on the SCI to terminal 2 via a Physical Sidelink Shared Channel (PSSCH).

[0124] For example, in NR resource allocation mode 1, a terminal can be provided with or allocated resources for one or more SL transmissions of one Transport Block (TB) from a base station via a dynamic grant. For example, the base station provides resources for PSCCH and / or PSSCH transmission to the terminal using the dynamic grant. For example, the transmitting terminal reports SL Hybrid Automatic Repeat Request (HARQ) feedback received from the receiving terminal to the base station. In this case, the PUCCH resource and timing for reporting the SL HARQ feedback to the base station are determined based on an indication in the PDCCH for the base station to allocate resources for SL transmission.

[0125] For example, the DCI indicates a slot offset between the reception of the DCI and the first SL transmission scheduled by the DCI. For example, the minimum gap between the DCI scheduling the SL transmission resource and the first scheduled SL transmission resource is not smaller than the processing time of the corresponding terminal.

[0126] For example, in NR resource allocation mode 1, the terminal is periodically provided or allocated a resource set by the base station for multiple SL transmissions via a configured grant. For example, the configured grant includes a configured grant type 1 or a configured grant type 2. For example, the terminal can determine a TB to transmit in each occasion indicated by a given configured grant.

[0127] For example, a base station may allocate SL resources to terminals on the same carrier, and may allocate SL resources to terminals on different carriers.

[0128] For example, an NR base station controls LTE-based SL communication. For example, the NR base station transmits NR DCI to a terminal to schedule LTE SL resources. In this case, for example, a new RNTI for scrambling the NR DCI can be defined. For example, the terminal may include an NR SL module and an LTE SL module.

[0129] For example, after a terminal including an NR SL module and an LTE SL module receives an NR SL DCI from a gNB, the NR SL module can convert the NR SL DCI to LTE DCI type 5A, and the NR SL module can transmit the LTE DCI type 5A to the LTE SL module every X ms. For example, after the LTE SL module receives LTE DCI format 5A from the NR SL module, the LTE SL module can apply activation and / or deactivation to the first LTE subframe Z ms later. For example, X can be dynamically displayed using a DCI field. For example, the minimum value of X varies depending on UE capability. For example, the terminal can report a single value depending on the UE capability. For example, X can be a positive number.

[0130] Referring to (b) of FIG. 6, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, a terminal can determine SL transmission resources within SL resources configured by a base station / network or preconfigured SL resources. For example, the configured SL resources or preconfigured SL resources may be a resource pool. For example, a terminal can autonomously select or schedule resources for SL transmission. For example, a terminal can perform SL communication by self-selecting resources within a configured resource pool. For example, a terminal can perform sensing and resource (re)selection procedures to self-select resources within a selection window. For example, the sensing can be performed on a subchannel basis. Then, terminal 1, which self-selects resources within the resource pool, can transmit SCI to terminal 2 via a PSCCH and then transmit data based on the SCI to terminal 2 via a PSSCH.

[0131] A re-evaluation operation can be performed for the resource (re)selection. Immediately before transmitting on the reserved resources, the terminal re-evaluates the selectable resource set to determine whether its intended transmission is still suitable. Based on the sensing result, the re-evaluation is performed in a slot based on a preset value (T3). For example, the re-evaluation operation is performed in a slot (e.g., m-T3) prior to slot (m) in which an SCI indicating the reserved resource(s) is first signaled.

[0132] The preset value (T3) is related to pre-emption and / or re-evaluation of SL resources. Specifically, the UE can perform operations related to pre-emption and / or re-evaluation based on Table 5 below.

[0133] [Table 5-1] [Table 5-2]

[0134] The preset value (T3) is a processing time set for terminal resource selection. The subcarrier spacing is set to the same value as JPEG0007737546000007.jpg13152. Table 6 below shows the subcarrier spacing setting for the sidelink bandwidth (SL BWP). The processing time determined based on JPEG0007737546000008.jpg12146 is shown below. For example, JPEG0007737546000009.jpg12149 is set to determine the start point (T1) of the resource selection window.

[0135] [Table 6]

[0136] For example, a terminal can assist other terminals in selecting SL resources. For example, in NR resource allocation mode 2, a terminal can be configured with a grant for SL transmission. For example, in NR resource allocation mode 2, a terminal can schedule SL transmissions of other terminals. For example, in NR resource allocation mode 2, a terminal can reserve SL resources for blind retransmissions.

[0137] For example, in NR resource allocation mode 2, the first terminal uses the SCI to indicate the priority of SL transmission to the second terminal. For example, the second terminal decodes the SCI, and performs sensing and / or resource (re)selection based on the priority. For example, the resource (re)selection procedure includes a step in which the second terminal identifies candidate resources in a resource selection window and a step in which the second terminal selects a resource for (re)transmission from the identified candidate resources. For example, the resource selection window may be a time interval during which the terminal selects a resource for SL transmission. For example, after the second terminal triggers resource (re)selection, the resource selection window starts from T1≧0, and the resource selection window is limited by the remaining packet delay budget of the second terminal. T1 is a processing time set for resource selection. JPEG0007737546000011.jpg14138. For example, if the slot in which the resource (re)selection is triggered is n, the resource selection window is determined to be the time interval from n+T1 to n+T2, where T2 indicates a number of slots that is less than or equal to the number of slots corresponding to the remaining packet delay budget.

[0138] For example, when a second terminal identifies candidate resources in a resource selection window, if a specific resource is indicated by an SCI received by the second terminal from the first terminal and the L1 SL RSRP measurement value for the specific resource exceeds an SL RSRP threshold, the second terminal may not determine the specific resource as a candidate resource. For example, the SL RSRP threshold may be determined based on the priority of SL transmission indicated by the SCI received by the second terminal from the first terminal and the priority of SL transmission on the resource selected by the second terminal.

[0139] For example, the L1 SL RSRP can be measured based on an SL Demodulation Reference Signal (DMRS). For example, one or more PSSCH DMRS patterns can be configured or pre-configured in the time domain for each resource pool. For example, the PDSCH DMRS configuration Type 1 and / or Type 2 can be the same as or similar to the frequency domain pattern of the PSSCH DMRS. For example, the exact DMRS pattern can be indicated by the SCI. For example, in NR resource allocation mode 2, the transmitting terminal can select a specific DMRS pattern from among the DMRS patterns configured or pre-configured for the resource pool.

[0140] For example, in NR resource allocation mode 2, based on the sensing and resource (re)selection procedure, the transmitting terminal can perform the initial transmission of a transport block (TB) without reservation. For example, based on the sensing and resource (re)selection procedure, the transmitting terminal can reserve SL resources for the initial transmission of a second TB using the SCI associated with the first TB.

[0141] For example, in NR resource allocation mode 2, a UE can reserve resources for feedback-based PSSCH retransmissions via signaling related to a previous transmission of the same Transport Block (TB). For example, the maximum number of SL resources reserved by one transmission, including the current transmission, is two, three, or four. For example, the maximum number of SL resources is the same regardless of whether HARQ feedback is enabled. For example, the maximum number of HARQ (re)transmissions for one TB is limited by configuration or pre-configuration. For example, the maximum number of HARQ (re)transmissions may be up to 32. For example, if there is no configuration or pre-configuration, the maximum number of HARQ (re)transmissions may not be specified. For example, the configuration or pre-configuration is for the transmitting UE. For example, in NR resource allocation mode 2, HARQ feedback for releasing resources unused by the UE may be supported.

[0142] For example, in NR resource allocation mode 2, a terminal can use an SCI to indicate to other terminals one or more subchannels and / or slots to be used by the terminal. For example, a terminal can use an SCI to indicate to other terminals one or more subchannels and / or slots reserved by the terminal for PSSCH (re)transmission. For example, the minimum allocation unit of SL resources is a slot. For example, the size of a subchannel can be configured for the terminal or can be preset.

[0143] SCI (Sidelink Control Information)

[0144] Control information transmitted from a base station to a terminal via a PDCCH is referred to as Downlink Control Information (DCI), while control information transmitted from a terminal to another terminal via a PSCCH is referred to as SCI. For example, a terminal may know the start symbol of the PSCCH and / or the number of symbols of the PSCCH before decoding the PSCCH. For example, the SCI includes SL scheduling information. For example, a terminal transmits at least one SCI to another terminal to schedule the PSCCH. For example, one or more SCI formats (formats) may be defined.

[0145] For example, a transmitting terminal transmits an SCI to a receiving terminal on a PSCCH, and the receiving terminal decodes one SCI to receive the PSSCH from the transmitting terminal.

[0146] For example, the transmitting terminal transmits two consecutive SCIs (e.g., 2-stage SCIs) on the PSCCH and / or PSSCH to the receiving terminal. The receiving terminal decodes the two consecutive SCIs (e.g., 2-stage SCIs) to receive the PSSCH from the transmitting terminal. For example, if the SCI configuration fields are divided into two groups in consideration of a (relatively) high SCI payload size, the SCI including the first SCI configuration field group may be referred to as the first SCI or the first SCI. st The SCI including the second SCI configuration field group may be referred to as the second SCI or the second nd The SCI may be referred to as an SCI. For example, a transmitting terminal transmits a first SCI to a receiving terminal via a PSCCH. For example, a transmitting terminal transmits a second SCI to a receiving terminal on a PSCCH and / or a PSSCH. For example, the second SCI is transmitted to a receiving terminal via a (separate) PSCCH or piggybacked with data via a PSSCH. For example, two consecutive SCIs may be applied to different transmissions (e.g., unicast, broadcast, or groupcast).

[0147] For example, the transmitting terminal transmits some or all of the following information to the receiving terminal via the SCI: Here, for example, the transmitting terminal transmits some or all of the following information to the receiving terminal via the first SCI and / or the second SCI:

[0148] PSSCH and / or PSCCH related resource allocation information, such as time / frequency resource location / number, resource reservation information (e.g., periodicity), and / or

[0149] -SL CSI report request indicator or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) report request indicator, and / or

[0150] - SL CSI transmission indicator (on PSSCH) (or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) information transmission indicator), and / or

[0151] -MCS information, and / or

[0152] -transmission power information, and / or

[0153] L1 destination ID information and / or L1 source ID information, and / or

[0154] -SL HARQ process ID information, and / or

[0155] -NDI (New Data Indicator) information, and / or

[0156] -RV (Redundancy Version) information, and / or

[0157] - (transmission traffic / packet related) QoS information, e.g., priority information, and / or

[0158] -SL CSI-RS transmission indicator or (transmitted) SL CSI-RS antenna port number information

[0159] -Location information of the transmitting terminal or location (or distance area) information of the target receiving terminal (for which SL HARQ feedback is required), and / or

[0160] -Reference signal (e.g., DMRS, etc.) information related to decoding and / or channel estimation of data transmitted via PSSCH, for example, information on the pattern of DMRS (time-frequency) mapping resources, rank information, antenna port index information;

[0161] For example, the first SCI may include information about channel sensing. For example, the receiving terminal decodes the second SCI using the PSSCH DMRS. The polar code used for the PDCCH may be applied to the second SCI. For example, in a resource pool, the payload size of the first SCI is the same for unicast, groupcast, and broadcast. After decoding the first SCI, the receiving terminal does not need to perform blind decoding of the second SCI. For example, the first SCI may include scheduling information for the second SCI.

[0162] Meanwhile, in various embodiments herein, since the transmitting terminal can transmit at least one of the SCI, the first SCI, and / or the second SCI to the receiving terminal via the PSCCH, the PSCCH may be substituted / replaced by at least one of the SCI, the first SCI, and / or the second SCI. And / or, for example, the SCI may be substituted / replaced by at least one of the PSCCH, the first SCI, and / or the second SCI. And / or, for example, since the transmitting terminal can transmit the second SCI to the receiving terminal via the PSSCH, the PSSCH may be substituted / replaced by the second SCI.

[0163] Meanwhile, FIG. 7 shows three cast types according to one embodiment of the present disclosure.

[0164] Specifically, (a) of FIG. 7 shows broadcast type SL communication, (b) of FIG. 7 shows unicast type SL communication, and (c) of FIG. 7 shows groupcast type SL communication. In unicast type SL communication, a terminal can perform one-to-one communication with another terminal. In groupcast type SL communication, a terminal can perform SL communication with one or more terminals in a group to which the terminal belongs. In various embodiments of the present specification, SL groupcast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0165] The following describes CAM (Cooperative Awareness Message) and DENM (Decentralized Environmental Notification Message).

[0166] In vehicle-to-vehicle communication, periodic messages such as CAM and event-triggered messages such as DENM are transmitted. CAM includes dynamic vehicle status information such as direction and speed, static vehicle data such as dimensions, and basic vehicle information such as external lighting status and route details. The size of CAM can be 50-300 bytes. CAM is broadcast and latency must be less than 100 ms. DENM is a message generated in the event of an unexpected situation such as a vehicle breakdown or accident. The size of DENM is less than 3000 bytes, and all vehicles within the transmission range can receive the message. In this case, DENM may have a higher priority than CAM.

[0167] Carrier reselection will now be described.

[0168] In V2X or SL communication, a terminal may perform carrier reselection based on the configured carrier's Channel Busy Ratio (CBR) and / or the Prose Per-Packet Priority (PPPP) of a V2X message to be transmitted. For example, carrier reselection may be performed by the terminal's MAC layer. In various embodiments herein, ProSe Per Packet Priority (PPPP) may be substituted for ProSe Per Packet Reliability (PPPR), and PPPR may be substituted for PPPP. For example, a smaller PPPP value indicates higher priority, and a larger PPPP value indicates lower priority. For example, a smaller PPPR value indicates higher reliability, and a larger PPPR value indicates lower reliability. For example, a PPPP value associated with a service, packet, or message associated with a high priority is smaller than a PPPP value associated with a service, packet, or message associated with a low priority. For example, a PPPR value associated with a service, packet, or message associated with high reliability is smaller than a PPPR value associated with a service, packet, or message associated with low reliability.

[0169] CBR refers to the portion of sub-channels in a resource pool where the Sidelink-Received Signal Strength Indicator (S-RSSI) measured by the UE is detected to exceed a preset threshold. There is a PPPP associated with each logical channel, and the PPPP value setting must reflect the latency required by both the UE and the base station. During carrier reselection, the UE can select one or more carriers from the candidate carriers in increasing order, starting with the lowest CBR.

[0170] The following describes RRC connection establishment between terminals.

[0171] For V2X or SL communication, a transmitting terminal may need to establish a (PC5) RRC connection with a receiving terminal. For example, the terminal may obtain a V2X-specific SIB. For a terminal configured by a higher layer to transmit V2X or SL communication and having data to transmit, if the V2X-specific SIB includes at least the frequency on which the terminal is configured to transmit for SL communication, the terminal can establish an RRC connection with another terminal without including a transmission resource pool for the frequency. For example, once an RRC connection is established between the transmitting terminal and the receiving terminal, the transmitting terminal can perform unicast communication with the receiving terminal via the established RRC connection.

[0172] Once an RRC connection is established between the terminals, the transmitting terminal can send RRC messages to the receiving terminal.

[0173] The receiving terminal performs antenna / resource demapping, demodulation, and decoding on the received information. The information is transmitted to the RRC layer via the MAC layer, RLC layer, and PDCP layer. Therefore, the receiving terminal receives the RRC message generated by the transmitting terminal.

[0174] V2X or SL communication can be supported for terminals in RRC_CONECTED mode, RRC_IDLE mode, and (NR)RRC_INACTIVE mode. That is, terminals in RRC_CONECTED mode, RRC_IDLE mode, and (NR)RRC_INACTIVE mode can perform V2X or SL communication. Terminals in RRC_INACTIVE mode or RRC_IDLE mode can perform V2X or SL communication by using cell-specific configuration included in a V2X-specific SIB.

[0175] RRC is used to exchange at least UE capabilities and AS layer configuration. For example, a first terminal transmits its UE capabilities and AS layer configuration to a second terminal, and the first terminal receives its UE capabilities and AS layer configuration from the second terminal. For UE capability transfer, the information flow is triggered during or after PC5-S signaling for direct link setup.

[0176] The following explains SL RLM (Radio Link Monitoring).

[0177] For unicast AS-level link management, SL Radio Link Monitoring (RLM) and / or Radio Link Failure (RLF) declarations are supported. For RLC Acknowledged Mode (AM) in SL unicast, RLF declaration is triggered by an indication from RLC indicating that the maximum number of retransmissions has been reached. The AS-level link status (e.g., failure) needs to be known to upper layers. Unlike the RLM procedure for unicast, groupcast-related RLM design may not be considered. RLM and / or RLF declarations are not required between group members for groupcast.

[0178] For example, the transmitting terminal may transmit a reference signal to the receiving terminal, and the receiving terminal may use the reference signal to perform SL RLM. For example, the receiving terminal may use the reference signal to declare SL RLF. For example, the reference signal may be referred to as an SL reference signal.

[0179] Measurement and Reporting for SL

[0180] The following describes SL measurement and reporting.

[0181] SL measurement and reporting (e.g., RSRP, RSRQ) between terminals are considered in SL for purposes such as QoS prediction, initial transmission parameter setting, link adaptation, link management, and admission control. For example, a receiving terminal receives a reference signal from a transmitting terminal, and the receiving terminal measures the channel state for the transmitting terminal based on the reference signal. Then, the receiving terminal reports channel state information (CSI) to the transmitting terminal. SL-related measurements and reporting include CBR measurement and reporting and location information reporting. Examples of CSI (Channel Status Information) for V2X include CQI (Channel Quality Indicator), PMI (Precoding Matrix Index), RI (Rank Indicator, RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), path gain / path loss, SRI (Sounding Reference Symbols, Resource Indicator), CRI (CSI-RS Resource Indicator), interference condition, and vehicle motion. In the case of unicast communication, CQI, RI, and PMI, or some of them, can be supported in non-subband-based aperiodic CSI reporting assuming four or fewer antenna ports. The CSI procedure may not rely on a standalone RS. CSI reporting is activated and deactivated depending on the configuration.

[0182] For example, a transmitting terminal transmits a CSI-RS to a receiving terminal, and the receiving terminal measures a CQI or RI using the CSI-RS. For example, the CSI-RS may be referred to as an SL CSI-RS. For example, the CSI-RS is confined within a PSSCH transmission. For example, the transmitting terminal transmits the CSI-RS to the receiving terminal by including it on a PSSCH resource.

[0183] Physical layer processing will now be described.

[0184] According to one embodiment herein, a data unit is subject to physical layer processing at the transmitting side before being transmitted over the radio interface, and according to one embodiment herein, a radio signal carrying the data unit is subject to physical layer processing at the receiving side.

[0185] Table 7 shows the mapping relationship between the uplink transmission channels and the physical channels, and Table 8 shows the mapping relationship between the uplink control channel information and the physical channels.

[0186] [Table 7]

[0187] [Table 8]

[0188] Table 9 shows the mapping relationship between the downlink transmission channels and the physical channels, and Table 10 shows the mapping relationship between the downlink control channel information and the physical channels.

[0189] [Table 9]

[0190] [Table 10]

[0191] Table 11 shows the mapping relationship between the SL transmission channels and the physical channels, and Table 12 shows the mapping relationship between the SL control channel information and the physical channels.

[0192] [Table 11]

[0193] [Table 12]

[0194] In the physical layer processing at the transmitting / receiving side described above, the time and frequency domain resources (e.g., OFDM symbols, subcarriers, carrier frequencies) associated with subcarrier mapping, OFDM modulation, and frequency up / down conversion are determined based on resource allocation (e.g., uplink grant, downlink allocation).

[0195] HARQ(Hybrid Automatic Repeat Request) for SL

[0196] The HARQ (Hybrid Automatic Repeat Request) procedure will be explained below.

[0197] Error compensation techniques for ensuring communication reliability include the Forward Error Correction (FEC) scheme and the Automatic Repeat Request (ARQ) scheme. The FEC scheme adds an extra error correction code to information bits to correct errors at the receiving end. The FEC scheme has the advantage of having little time delay and not requiring additional information exchange between the transmitting and receiving ends, but has the disadvantage of reducing system efficiency in good channel environments. The ARQ scheme can improve transmission reliability, but has the disadvantage of introducing time delays and reducing system efficiency in poor channel environments.

[0198] The Hybrid Automatic Repeat Request (HARQ) method combines FEC and ARQ, and improves performance by checking whether the data received by the physical layer contains undecodeable errors and requesting a retransmission if an error occurs.

[0199] For SL unicast and groupcast, HARQ feedback and HARQ combining in the physical layer can be supported. For example, when a receiving terminal operates in resource allocation mode 1 or 2, the receiving terminal receives a PSSCH from a transmitting terminal, and transmits HARQ feedback for the PSSCH to the transmitting terminal via a PSFCH (Physical Sidelink Feedback Channel) using a Sidelink Feedback Control Information (SFCI) format.

[0200] For example, SL HARQ feedback can be enabled for unicast. In this case, in non-CBG (non-Code Block Group) operation, when a receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal generates a HARQ-ACK. The receiving terminal then transmits the HARQ-ACK to the transmitting terminal. On the other hand, if the receiving terminal decodes a PSCCH targeted at the receiving terminal but fails to successfully decode a transmission block associated with the PSCCH, the receiving terminal generates a HARQ-NACK. The receiving terminal then transmits the HARQ-NACK to the transmitting terminal.

[0201] For example, SL HARQ feedback is enabled for groupcast. For example, in non-CBG operation, two HARQ feedback options are supported for groupcast.

[0202] (1) Groupcast Option 1: After a receiving terminal decodes a PSCCH targeted at the receiving terminal, if the receiving terminal fails to decode a transmission block associated with the PSCCH, the receiving terminal transmits a HARQ-NACK to the transmitting terminal via a PSFCH. On the other hand, if the receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal does not transmit a HARQ-ACK to the transmitting terminal.

[0203] (2) Groupcast Option 2: After a receiving terminal decodes a PSCCH targeted at the receiving terminal, if the receiving terminal fails to decode a transmission block associated with the PSCCH, the receiving terminal transmits a HARQ-NACK to the transmitting terminal via a PSFCH. Then, if the receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal transmits a HARQ-ACK to the transmitting terminal via a PSFCH.

[0204] For example, when groupcast option 1 is used for SL HARQ feedback, all terminals performing groupcast communication share the PSFCH resource, i.e., terminals belonging to the same group use the same PSFCH resource to transmit HARQ feedback.

[0205] For example, when groupcast option 2 is used for SL HARQ feedback, each terminal performing groupcast communication uses a different PSFCH resource for HARQ feedback transmission, for example, terminals belonging to the same group can transmit HARQ feedback using different PSFCH resources.

[0206] For example, when SL HARQ feedback is enabled for groupcast, the receiving terminal determines whether to send HARQ feedback to the transmitting terminal based on the TX-RX (Transmission-Reception) distance and / or RSRP.

[0207] For example, in the case of TX-RX distance-based HARQ feedback in groupcast option 1, if the TX-RX distance is smaller than or equal to the communication range requirement, the receiving terminal transmits HARQ feedback for the PSSCH to the transmitting terminal. On the other hand, if the TX-RX distance is larger than the communication range requirement, the receiving terminal does not transmit HARQ feedback for the PSSCH to the transmitting terminal. For example, the transmitting terminal informs the receiving terminal of the location of the transmitting terminal via an SCI associated with the PSSCH. For example, the SCI associated with the PSSCH may be a second SCI. For example, the receiving terminal can estimate or obtain the TX-RX distance based on the location of the receiving terminal and the location of the transmitting terminal. For example, the receiving terminal can decode an SCI associated with the PSSCH to determine the communication range requirement used for the PSSCH.

[0208] For example, in the case of resource allocation mode 1, the time between the PSFCH and the PSSCH can be configured or preset. In the case of unicast and groupcast, if retransmission is necessary on the SL, this can be indicated to the base station by a terminal within the coverage using the PUCCH. The transmitting terminal can also send an indication to the serving base station of the transmitting terminal in the form of a Scheduling Request (SR) / Buffer Report (BSR) that is not in the form of a HARQ ACK / NACK. Also, even if the base station does not receive the indication, the base station can schedule SL retransmission resources to the terminal. For example, in the case of resource allocation mode 2, the time between the PSFCH and the PSSCH can be configured or preset.

[0209] For example, from the perspective of UE transmission on a carrier, TDM between the PSCCH / PSSCH and the PSFCH is permitted for the PSFCH format for SL in a slot. For example, a sequence-based PSFCH format having one symbol may be supported. Here, the one symbol may not be an AGC period. For example, the sequence-based PSFCH format may be applicable to unicast and groupcast.

[0210] For example, within a slot associated with a resource pool, the PSFCH resources may be periodically configured or pre-configured as an N-slot interval, where N may be set to one or more values ​​greater than or equal to 1. For example, N may be 1, 2, or 4. For example, HARQ feedback for transmissions in a particular resource pool is transmitted only via the PSFCH on the particular resource pool.

[0211] For example, if a transmitting terminal transmits a PSSCH to a receiving terminal from slot #X to slot #N, the receiving terminal can transmit HARQ feedback for the PSSCH to the transmitting terminal in slot #(N+A). For example, slot #(N+A) may include a PSFCH resource. Here, for example, A may be the smallest integer greater than or equal to K. For example, K is the number of logical slots. In this case, K may be the number of slots in a resource pool. Or, for example, K is the number of physical slots. In this case, K is the number of slots inside and outside the resource pool.

[0212] For example, when a receiving terminal transmits HARQ feedback on a PSFCH resource in response to a PSSCH transmitted from a transmitting terminal to the receiving terminal, the receiving terminal may determine the frequency domain and / or code domain of the PSFCH resource based on an implicit mechanism within a configured resource pool. For example, the receiving terminal may determine the frequency domain and / or code domain of the PSFCH resource based on at least one of a slot index associated with the PSCCH / PSSCH / PSFCH, a subchannel associated with the PSCCH / PSSCH, and / or an identifier for distinguishing each receiving terminal in a group for groupcast option 2-based HARQ feedback. And / or, for example, the receiving terminal may determine the frequency domain and / or code domain of the PSFCH resource based on at least one of SL RSRP, SINR, L1 source ID, and / or location information.

[0213] For example, if a terminal's HARQ feedback transmission via the PSFCH and its reception via the PSFCH overlap, the terminal selects either the HARQ feedback transmission via the PSFCH or the HARQ feedback reception via the PSFCH based on a priority rule. For example, the priority rule may be based on the minimum priority indication of the associated PSCCH / PSSCH.

[0214] For example, if HARQ feedback transmissions related to PSFCHs for multiple terminals overlap, the terminal may select a specific HARQ feedback transmission based on a priority rule, which may be based on the minimum priority indication of the associated PSCCH / PSSCH.

[0215] Bandwidth Part and Resource Pool

[0216] Below, we will explain BWP (Bandwidth Part) and resource pool.

[0217] When using Bandwidth Adaptation (BA), the reception bandwidth and transmission bandwidth of the terminal do not need to be as large as the cell bandwidth, and the reception bandwidth and transmission bandwidth of the terminal can be adjusted. For example, the network / base station can notify the terminal of the bandwidth adjustment. For example, the terminal receives information / settings for bandwidth adjustment from the network / base station. In this case, the terminal performs bandwidth adjustment based on the received information / settings. For example, the bandwidth adjustment may include bandwidth reduction / expansion, bandwidth relocation, or bandwidth subcarrier spacing change.

[0218] For example, bandwidth may be reduced during periods of low activity to save power. For example, the location of the bandwidth may be moved in the frequency domain. For example, the location of the bandwidth may be moved in the frequency domain to increase scheduling flexibility. For example, the subcarrier spacing of the bandwidth may be changed. For example, the subcarrier spacing of the bandwidth may be changed to accommodate different services. A subset of the total cell bandwidth of a cell may be referred to as a Bandwidth Part (BWP). BA is performed by the base station / network configuring a BWP for the terminal and informing the terminal of the currently active BWP from the configured BWPs.

[0219] FIG. 8 illustrates multiple BWPs according to an embodiment of the present disclosure.

[0220] Referring to FIG. 8, BWP1 having a bandwidth of 40 MHz and a subcarrier spacing of 15 kHz, BWP2 having a bandwidth of 10 MHz and a subcarrier spacing of 15 kHz, and BWP3 having a bandwidth of 20 MHz and a subcarrier spacing of 60 kHz are set.

[0221] 9 shows a BWP according to one embodiment of the present specification. In the embodiment of FIG. 9, it is assumed that there are three BWPs.

[0222] Referring to Figure 9, CRBs (common resource blocks) are carrier resource blocks numbered from one end of a carrier band to the other end, and PRBs are resource blocks numbered within each BWP. Point A can indicate a common reference point for the resource block grid.

[0223] BWP is point A, offset from point A (Nstart BWP ) and bandwidth (N size BWP ) For example, point A is the external reference point of the PRB of the carrier to which subcarrier 0 of all numerologies (e.g., all numerologies supported by the network on that carrier) is aligned. For example, the offset is the PRB spacing between the lowest subcarrier in a given numerology and point A. For example, the bandwidth is the number of PRBs in a given numerology.

[0224] A BWP is defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting terminal can transmit an SL channel or SL signal on a specific BWP, and a receiving terminal can receive an SL channel or SL signal on the specific BWP. In a licensed carrier, an SL BWP can be defined separately from a Uu BWP, and the SL BWP has separate configuration signaling from the Uu BWP. For example, a terminal receives a configuration for the SL BWP from a base station / network. An SL BWP can be configured (pre-configured) for out-of-coverage NR V2X terminals and RRC_IDLE terminals within a carrier. For terminals in RRC_CONECTED mode, at least one SL BWP can be activated within a carrier.

[0225] A resource pool is a set of time-frequency resources that can be used for SL transmission and / or SL reception. From the perspective of a terminal, the time domain resources in a resource pool may not be contiguous. Multiple resource pools can be (pre-)configured to a terminal within one carrier. From the perspective of the physical layer, a terminal can perform unicast, groupcast, and broadcast communications using configured or pre-configured resource pools.

[0226] Sidelink congestion control

[0227] The following describes sidelink congestion control.

[0228] When a terminal determines its own SL transmission resource, it also determines the size and frequency of the resource it uses. Of course, due to constraints from the network, etc., the use of resource size and frequency above a certain level may be restricted. However, if many terminals are concentrated in a specific area at a specific time, and all terminals use relatively large resources, the overall performance may be significantly degraded due to mutual interference.

[0229] Therefore, the UE needs to monitor the channel conditions. If it is determined that too many resources are being consumed, the UE preferably operates in a manner that reduces its resource usage. In this specification, this is defined as congestion control (CR). For example, the UE may determine whether the energy measured in a unit time / frequency resource is above a certain level, and adjust the amount and frequency of its transmission resources according to the ratio of unit time / frequency resources in which energy above the certain level is observed. In this specification, the ratio of time / frequency resources in which energy above the certain level is observed is defined as the channel busy ratio (CBR). The UE may measure the CBR for each channel / frequency. Additionally, the UE may transmit the measured CBR to the network / base station.

[0230] FIG. 10 illustrates a resource unit for CBR measurement according to one embodiment of the present specification.

[0231] Referring to FIG. 10, CBR may refer to the number of subchannels whose RSSI measurement result values ​​are equal to or greater than a preset threshold when a terminal measures RSSI (Received Signal Strength Indicator) on a subchannel basis for a specific period (e.g., 100 ms). Alternatively, CBR may refer to the proportion of subchannels in a specific period whose values ​​are equal to or greater than a preset threshold. For example, in the embodiment of FIG. 10, if it is assumed that the shaded subchannels are subchannels whose values ​​are equal to or greater than a preset threshold, CBR may refer to the proportion of the shaded subchannels for a 100 ms period. Additionally, the terminal may report the CBR to the base station.

[0232] FIG. 11 is a diagram illustrating a resource pool related to CBR measurement.

[0233] For example, when PSCCH and PSSCH are multiplexed as in the embodiment of Figure 11, a terminal can perform one CBR measurement for one resource pool. Here, if a PSFCH resource is configured or pre-configured, the PSFCH resource can be excluded from the CBR measurement.

[0234] Furthermore, congestion control that takes into account the priority of traffic (e.g., packets) is required. To this end, for example, a terminal can measure channel occupancy (CR). Specifically, the terminal measures the CBR and can determine the maximum value (CRlimitk) of channel occupancy (CRk) that can be occupied by traffic corresponding to each priority (e.g., k) according to the CBR. For example, the terminal can derive the maximum value (CRlimitk) of channel occupancy for each traffic priority based on a table in which CBR measurements are predefined. For example, for traffic with a relatively high priority, the terminal can derive a relatively large maximum value of channel occupancy. Thereafter, the terminal can perform congestion control by limiting the sum of the channel occupancy rates of traffic with a traffic priority k lower than i to a certain value or less. This method can impose a stronger channel occupancy restriction on traffic with a relatively low priority.

[0235] In addition, the terminal can control SL congestion by using methods such as adjusting the size of transmission power, dropping packets, determining whether to retransmit, and adjusting the size of transmission RBs (MCS adjustment).

[0236] In this specification, the wording "configured or defined" can be interpreted as being (pre)configured by a base station or a network (via predefined signaling (e.g., SIB, MAC signaling, RRC signaling)). For example, "A can be configured" includes "a base station or a network (pre)configuring / defining or informing a terminal of A." Alternatively, the wording "configured or defined" can be interpreted as being pre-configured or defined by the system. For example, "A can be configured" includes "A is pre-configured / defined by the system."

[0237] For the sake of convenience, the following abbreviations / acronyms will be used in this specification.

[0238] ACK / NACK:Acknowledgement / No Acknowledgement

[0239] AGC: Automatic Gain Control

[0240] AS: Access Stratum

[0241] CB:Codeblock

[0242] CBG / CG:Codeblock Group

[0243] CBR:Channel Busy Ratio

[0244] CE: Control Element

[0245] CFO: Carrier Frequency Offset

[0246] CG: Configured Grant

[0247] CP: Cyclic Prefix

[0248] CRC: Cyclic Redundancy Check

[0249] CSI: Channel State Information

[0250] CSI-RS:Channel State Information Reference Signal

[0251] DCI: Downlink Control Channel

[0252] DL:Downlink

[0253] DM-RS:Demodulation RS

[0254] ECP:Extended CP

[0255] FDD:Frequency Division Duplex

[0256] HARQ:Hybrid Automatic Repeat Request

[0257] L1:Layer 1

[0258] L2:Layer 2

[0259] LBS:Location Based Service

[0260] LCS:Location Service

[0261] LSB:Least Significant Bit

[0262] MAC:Medium Access Control

[0263] MCS:Modulation Coding Scheme

[0264] MIB:Master Information Block

[0265] MPR:Maximum Power Reduction

[0266] MSB:Most Significant Bit

[0267] NAS:Non-Access Stratum

[0268] NCP:Normal CP

[0269] NDI:New Data Indicator

[0270] PBCH:Physical Broadcast Channel

[0271] PDCCH:Physical Downlink Control Channel

[0272] PDCP:Packet Data Convergence Protocol

[0273] PDSCH:Physical Downlink Shared Channel

[0274] PDU:Protocol Data Unit

[0275] PRS:Positioning Reference Signal

[0276] PSBCH:Physical Sidelink Broadcast Channel

[0277] PSCCH:Physical Sidelink Control Channel

[0278] PSFCH:Physical Sidelink Feedback Channel

[0279] PSS:Primary Synchronization Signal

[0280] PSSCH:Physical Sidelink Shared Channel

[0281] PUCCH:Physical Uplink Control Channel

[0282] PUSCH:Physical Uplink Shared Channel

[0283] QoS:Quality of Service

[0284] RB:Resource Block

[0285] RLC:Radio Link Control

[0286] RLM:Radio Link Monitoring

[0287] RLF:Radio Link Failure

[0288] RRC:Radio Resource Control

[0289] RS:Reference Signal

[0290] RSRP:Reference Signal Received Power

[0291] RSRQ:Reference Signal Received Quality

[0292] RSSI:Received Signal Strength Indicator

[0293] RSTD:Reference Signal Time Difference

[0294] RSU:Road Side Unit

[0295] RTT:Round Trip Time

[0296] RV:Redundancy Version

[0297] SCI:Sidelink Control Information

[0298] SCS:Sub-Carrier Spacing

[0299] SDAP:Service Data Adaptation Protocol

[0300] SIB:System Information Block

[0301] SL:Sidelink

[0302] SL OLPC: Sidelink Open Loop Power Control

[0303] SL PL:Sidelink Pathloss

[0304] SLSSID:SL Synchronixatino Signal Identification

[0305] SNR:Signal-to-Noise Ratio

[0306] SPP:Sidelink Positioning Protocol

[0307] SPS:Semi-Persistent Scheduling

[0308] S-PSS:Sidelink PSS

[0309] SRS:Sounding Reference Signal

[0310] SSB:Synchronization Signal Block

[0311] SSS:Secondary Synchronization Signal

[0312] S-SSB: Sidelink SSB

[0313] S-SSS: Sidelink SSS

[0314] TB: Transport Block

[0315] TDD: Time Division Duplex

[0316] TDOA:Time Difference of Arriaval

[0317] TOA: Time of Arrival

[0318] UE: User Equipment / End

[0319] UL:Uplink

[0320] Uu-PSS:Uu link PSS

[0321] Uu-SSS:Uu link SSS

[0322] XOR: Exclusive OR

[0323] Meanwhile, 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 TX UE is a terminal that performs PSCCH and / or PSSCH transmission. And / or the TX UE is a terminal that transmits SL CSI-RS and / or SL CSI report request indicators to the (target) RX UE. And / or the TX UE is a terminal that transmits (control) channels (e.g., PSCCH, PSSCH, etc.) and / or reference signals on the (control) channels (e.g., DM-RS, CSI-RS, etc.) used for SL RLM and / or SLRLF operation of the (target) RX UE.

[0324] Meanwhile, in this specification, for example, a receiving terminal (RX UE) may be a terminal that transmits SL HARQ feedback to a transmitting terminal (TX UE) depending on whether it has successfully decoded data received from the TX UE and / or whether it has successfully detected / decoded a PSCCH (related to PSSCH scheduling) transmitted by the TX UE. And / or, the RX UE may be a terminal that transmits SL CSI to the TX UE based on an SL CSI-RS and / or an SL CSI report request indicator received from the TX UE. And / or, the RX UE may be a terminal that transmits SL (L1) RSRP measurement values ​​measured based on a (predefined) reference signal and / or an SL (L1) RSRP report request indicator received from the TX UE to the TX UE. And / or, the RX UE may be a terminal that transmits its own data to the TX UE. And / or the RX UE may be a terminal that performs SL RLM and / or SL RLF operations based on (preconfigured) (control) channels and / or reference signals on said (control) channels received from the TX UE.

[0325] Meanwhile, in this specification, for example, when an RX UE transmits SL HARQ feedback information for a PSSCH and / or a PSCCH received from a TX UE, the following schemes or some of the following schemes may be considered: Here, for example, the following schemes or some of the following schemes may be applied only when the RX UE successfully decodes / detects a PSCCH scheduling a PSSCH.

[0326] Option 1) NACK information can be sent to the TX UE only when the RX UE fails to decode / receive the PSSCH received from the TX UE.

[0327] Method (Option) 2) If the RX UE successfully decodes / receives the PSSCH received from the TX UE, it can send ACK information to the TX UE, and if it fails to decode / receive the PSSCH, it can send NACK information to the TX UE.

[0328] Meanwhile, in this specification, for example, a TX UE may transmit the following information or a part of the following information to a RX UE via an SCI: Here, for example, the TX UE may transmit a part or all of the following information to a RX UE via a first SCI (FIRST SCI) and / or a second SCI (SECOND SCI):

[0329] -PSSCH (and / or PSCCH) related resource allocation information (e.g., time / frequency resource position / number, resource reservation information (e.g., periodicity))

[0330] -SL CSI report request indicator or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) report request indicator

[0331] -SL CSI transmission indicator (on PSSCH) (or SL (L1) RSRP (and / or SL (L1) RSRQ, and / or SL (L1) RSSI) information transmission indicator)

[0332] -MCS information

[0333] -TX POWER information

[0334] -L1 DESTINATION ID information and / or L1 SORCE ID information

[0335] -SL HARQ PROCESS ID information

[0336] -NDI information

[0337] -RV information

[0338] -(Transmission traffic / packet related) QoS information (e.g., priority information)

[0339] -SL CSI-RS transmission indicator or (transmitted) SL CSI-RS antenna port number information

[0340] TX UE location information or target RX UE location (or distance area) information (for which SL HARQ feedback is required)

[0341] Reference signal (e.g., DM-RS, etc.) information related to decoding (and / or channel estimation) of data transmitted via PSSCH, such as information on the (time-frequency) mapping resource pattern of DM-RS, RANK information, antenna port index information, etc.

[0342] Meanwhile, in this specification, for example, since a TX UE can transmit an SCI, a first SCI (FIRST SCI), and / or a second SCI (SECOND SCI) to an RX UE via a PSCCH, the PSCCH may be substituted / replaced with an SCI and / or a FIRST SCI and / or a SECOND SCI. And / or an SCI may be substituted / replaced with a PSCCH and / or a FIRST SCI and / or a SECOND SCI. And / or, for example, since a TX UE can transmit a SECOND SCI to an RX UE via a PSSCH, the PSSCH may be substituted / replaced with a SECOND SCI.

[0343] Meanwhile, in this specification, for example, if the SCI configuration fields are divided into two groups in consideration of a (relatively) high SCI payload size, the first SCI including the first SCI configuration field group may be referred to as the FIRST SCI, and the second SCI including the second SCI configuration field group may be referred to as the SECOND SCI. For example, the FIRST SCI may be transmitted to the receiving terminal via a PSCCH. For example, the SECOND SCI may be transmitted to the receiving terminal via an (independent) PSCCH or may be piggybacked with data and transmitted via a PSSCH.

[0344] On the other hand, in this specification, for example, "configuration" or "definition" may mean (resource pool-specific) (PRE)CONFIGURATION from a base station or network (via predefined signaling (e.g., SIB, MAC, RRC, etc.)).

[0345] On the other hand, in this specification, for example, RLF can be determined based on an OUT-OF-SYNCH (OOS) indicator or an IN-SYNCH (IS) indicator, and therefore may be substituted / replaced with OUT-OF-SYNCH (OOS) or IN-SYNCH (IS).

[0346] Meanwhile, in this specification, for example, RB may be replaced / substituted with SUBCARRIER. Also, as an example, in the present invention, packet or traffic may be replaced / substituted with TB or MAC PDU depending on the layer to be transmitted.

[0347] On the other hand, herein, CBG or CG may be substituted / replaced with TB.

[0348] However, in this specification, for example, a SOURCE ID may be substituted / replaced with a DESTINATION ID.

[0349] Meanwhile, in this specification, for example, an L1 ID may be substituted / replaced with an L2 ID. For example, an L1 ID may be an L1 source ID or an L1 destination ID. For example, an L2 ID may be an L2 source ID or an L2 destination ID.

[0350] Meanwhile, in this specification, for example, the operation of a transmitting terminal reserving / selecting / determining a retransmission resource may mean the operation of the transmitting terminal reserving / selecting / determining a potential retransmission resource, which is determined to be actually used or not based on SL HARQ feedback information received from a receiving terminal.

[0351] Meanwhile, in this specification, SL MODE1 may refer to a resource allocation method or communication method in which a base station directly schedules a sidelink transmission (SL TX) resource of a terminal via predefined signaling (e.g., DCI), and SL MODE2 may refer to a resource allocation method or communication method in which a terminal independently selects an SL TX resource from a predefined resource pool, or is configured by a base station or a network.

[0352] Meanwhile, in this specification, for convenience of explanation, a (physical) channel used when an RX UE transmits at least one of the following information to a TX UE is referred to as a Physical Sidelink Feedback Channel (PSFCH):

[0353] -SL HARQ feedback, SL CSI, SL (L1) RSRP

[0354] Meanwhile, the base station allocates resources (hereinafter referred to as SL resources) used for transmitting and receiving SL channels / signals to the terminal. For example, the base station transmits information about the resources to the terminal. In this specification, the method by which the base station allocates SL resources to the terminal may be referred to as Mode 1 method, Mode 1 operation, or resource allocation Mode 1.

[0355] In contrast, the terminal can select SL resources within the resource pool based on sensing. In this specification, the manner in which the terminal selects SL resources may be referred to as a Mode 2 method, Mode 2 operation, or resource allocation Mode 2. For example, in resource allocation Mode 2, the terminal can detect SCIs transmitted by other terminals, identify resources reserved by other terminals based on the SCIs, and obtain RSRP measurements. Then, the terminal can select resources to be used for SL transmission, excluding specific resources within the resource selection window, based on the sensing results. For example, the specific resources are based on the resource(s) (e.g., removed or dropped resource(s)) based on Table 5.

[0356] In the sensing operation, the UE may refer to resource allocation information received via the first SCI, but due to the overhead of the first SCI, the amount of information the UE can obtain on the first SCI is limited.

[0357] According to various embodiments of the present specification, the second terminal transmits additional auxiliary information to assist the first terminal in its sensing operation and / or resource selection operation. The first terminal may use the auxiliary information received from the second terminal to improve PSSCH detection performance and / or reduce half-duplex limitations and / or select reserved resources for transmitting and receiving specific signals. In the embodiments of the present specification, for convenience of explanation, it is assumed that UE-A transmits auxiliary information to UE-B. It is assumed that UE-B selects resources for the PSCCH / PSSCH to be transmitted to UE-A and / or resources for the PSCCH / PSSCH to be transmitted to UE-C (i.e., a third UE) based on the auxiliary information received from UE-A.

[0358] 12 illustrates a procedure in which UE-A transmits auxiliary information to UE-B according to an embodiment of the present disclosure. The embodiment of FIG. 12 can be combined with various embodiments of the present disclosure.

[0359] 12, at S1200, UE-A transmits auxiliary information to UE-B. For example, UE-B selects resources for a PSCCH / PSSCH to be transmitted to UE-A based on the auxiliary information received from UE-A, and UE-B performs SL transmission using the resources. For example, UE-B selects resources for a PSCCH / PSSCH to be transmitted to UE-C based on the auxiliary information received from UE-A, and UE-B performs SL transmission using the resources. In this specification, auxiliary information may also be referred to as additional information.

[0360] On the other hand, when UE-A transmits preferred or non-preferred resources for transmission to assist UE-A in resource selection, it transmits via PSCCH / PSSCH depending on the amount of information, and UE-A independently (re)selects resources to secure the PSCCH / PSSCH resources, which reduces the efficiency of the resource reselection method using the auxiliary information. On the other hand, PSCCH / PSSCH transmission including the auxiliary information also increases congestion or causes problems such as a half-duplex problem.

[0361] According to an embodiment of the present specification, UE-A may transmit to UE-B information or an indicator that triggers reselection of selected / reserved resources for UE-B transmission. For example, the resource reselection indicator or resource collision indicator may be transmitted by UE-A to UE-B via a PSFCH resource or in a PSFCH format. According to an embodiment of the present specification, the PSFCH resource or its candidate set for the resource collision indicator may be configured (pre-configured) independently of the PSFCH resource configuration for SL HARQ-ACK, or may be configured between UEs via PC5-RRC.

[0362] According to an embodiment of the present specification, the PSFCH resource or its candidate set for the resource collision indicator may inherit all or part of the PSFCH resource configuration for SL HARQ-ACK (e.g., PSFCH resource cycle), and / or the PSFCH state (ACK or NACK, m_CS value) may be configured separately (in advance) or configured in PC5-RRC. For example, the PSFCH resource period for the resource collision indicator may be the same as and / or larger than the PSFCH resource period for SL HARQ-ACK.

[0363] Meanwhile, the reserved resources of the UE may be determined based on the transmission resource pool of the UE, and more specifically, the reserved resources of the UE may be determined by applying a time resource indicator value (TRIV) and / or a resource reservation period to a set of slots in the transmission resource pool of the UE.

[0364] In this specification, UE-A may refer to a terminal that determines whether or not there is a conflict between reserved resources and transmits a resource conflict indicator (PSFCH with conflict information). Furthermore, a terminal to which UE-A transmits a resource conflict indicator may be referred to as UE-B or UE-C. UE-B and UE-C may refer to terminals that transmit an SCI indicating reserved resources to UE-A. The terms "UE-B" and "UE-C" are used to distinguish terminals that may receive a resource conflict indicator, and are not used to limit terminals to which operations according to embodiments of this specification are applied to terminals in a specific order based on UE-A. As a specific example, an embodiment / operation based on the SCI / reserved resources / RSRP of UE-C is not intended to be limited to one that is applied to a UE designated as the third based on UE-A. That is, an embodiment / operation based on the SCI / reserved resources / RSRP of UE-C may be modified / interpreted / applied to an embodiment / operation based on the SCI / reserved resources / RSRP of UE-B. In other words, if UE-A is the first terminal, the second terminal may be UE-B or UE-C, and the third terminal may be UE-C or UE-B. An embodiment / operation based on the SCI / reserved resources / RSRP of the second terminal may be interpreted as an embodiment / operation based on the SCI / reserved resources / RSRP of the third terminal, and vice versa.

[0365] Meanwhile, if the understanding of resource pools differs between the terminal UE-B, which indicates information about reserved resources (e.g., via a first SCI (first stage SCI)), and the terminal UE-A, which determines whether there is a resource conflict for the reserved resources and can send a resource conflict indicator (PSFCH with conflict information), the resource conflict determined by the UE-A may be inaccurate. That is, the accuracy of the presence or absence of resource conflict may be low. For example, the UE-A may determine that the reserved resources conflict even when there is no conflict, and transmit a resource conflict indicator (PSFCH with conflict information). In this case, the reserved resources may refer to reserved resources that are overlapped in the time and frequency domains. In order to ensure the accuracy of the presence or absence of resource conflict, the following embodiments may be considered.

[0366] For example, when UE-A determines whether there is a resource conflict between UE-B's reserved resources and UE-C's reserved resources, the transmission resource pool for UE-B's reserved resources, the transmission resource pool for UE-C's reserved resources, and the transmission resource pool configured for UE-A may all be the same. For example, UE-A, which transmits additional information, and UE-B, which receives and uses the additional information, may use at least one identical transmission resource pool. This is because UE-B and / or UE-C have the same understanding of the locations of UE-B's and UE-C's reserved resources determined by UE-A. That is, for the accuracy of determining whether a resource conflict has occurred and for resource reselection after transmitting a resource conflict indicator, the locations of UE-B's reserved resources and UE-C's reserved resources where a resource conflict has occurred must be identically identified by UE-A, UE-B, and UE-C. For example, UE-A may be configured with multiple transmission resource pools, at least one of which may be the same as the transmission pool for UE-B's reserved resources and the transmission pool for UE-C's reserved resources. For example, UE-A can check whether the same transmission resource pool is set up through information exchange with UE-B and / or UE-C (terminals performing transmissions that are subject to resource conflict with the resources reserved by UE-B), and then UE-A can determine whether there is a resource conflict with the resources reserved by UE-B and / or UE-C.

[0367] For example, when UE-A determines whether there is a resource collision between resources reserved by UE-B and resources reserved by UE-C, UE-A may determine whether there is a resource collision for each transmission resource pool of UE-A based on an SCI (e.g., a first SCI) and / or a PSSCH obtained from a slot belonging to the same transmission resource pool. For example, UE-A may determine the reserved resources for UE-B based on the transmission resource pool of UE-A including the slot in which the SCI received from UE-B is received. For example, UE-A may determine the reserved resources for UE-C based on the transmission resource pool of UE-A including the slot in which the SCI received from UE-C is received. This is because UE-B, UE-C, and UE-A derive their reserved resources from the same transmission resource pool and have the same understanding of the location of the reserved resources. In other words, when considering the accuracy of determining whether there is a resource collision and the efficiency of resource reselection operations, the location of the reserved resources for each UE must be identified in the same way even in different UEs. For example, UE-A may not determine resource collision based on SCI and / or PSSCH received across different resource pools. For example, UE-A may not determine whether there is resource collision between reserved resources determined based on UE-B's SCI received in UE-A's first transmission resource pool (i.e., UE-B's SCI received in slots belonging to the first transmission resource pool) and reserved resources determined based on UE-C's SCI received in UE-A's second transmission resource pool (i.e., UE-C's SCI received in slots belonging to the second transmission resource pool).

[0368] For example, when UE-A determines whether there is a resource conflict between UE-B's reserved resources and UE-C's reserved resources, UE-A may have previously acquired transmission resource pool information for UE-B's reserved resources and / or transmission resource pool information for UE-C's reserved resources.

[0369] For example, in the above example, transmission resource pool information for UE-B's reserved resources and / or transmission resource pool information for UE-C's reserved resources may be configured in UE-A (in advance). For example, in the above example, UE-A may receive configuration of transmission resource pool information for UE-B's reserved resources and / or transmission resource pool information for UE-C's reserved resources via PC5-RRC. For example, in determining resource conflicts, UE-A may determine UE-B's reserved resources based on the UE-B's transmission resource pool and / or determine UE-C's reserved resources based on the UE-C's transmission resource pool. Then, UE-A may determine whether there is resource conflict based on whether there is overlap between the corresponding reserved resources. For example, UE-A may receive configuration of information regarding transmission resource pools and / or SOURCE ID and / or DESIGN UP ID information for the resource pools. UE-A can determine the respective transmission resource pools based on the SOURCE ID and / or DESTINATION ID obtained from the SCI transmitted by UE-B and the SOURCE ID and / or DESTINATION ID obtained from the SCI transmitted by UE-C.

[0370] On the other hand, if UE-A is the intended receiver of UE-C's transmission (e.g., UE-A is the intended receiver for UE-C's PSSCH transmission), it can determine a resource conflict between UE-C's reserved resources and UE-B's reserved resources. UE-A can send a resource conflict indicator (e.g., PSFCH) to UE-C and / or UE-B.

[0371] For example, UE-A may determine whether to transmit a resource conflict indicator to UE-B based on PSCCH DMRS and / or PSSCH DMRS-based RSRP measurement values ​​corresponding to an SCI (e.g., first stage SCI / SCI format 1-A) indicating UE-C's reserved resources and / or PSCCH DMRS and / or PSSCH DMRS-based RSRP measurement values ​​corresponding to an SCI (e.g., first stage SCI / SCI format 1-A) indicating UE-B's reserved resources.

[0372] For example, UE-A may send a resource collision indicator when a value obtained by dividing an RSRP measurement value corresponding to a resource reserved by UE-B (e.g., RSRP measured based on SCI format 1-A of UE-B) by an RSRP measurement value corresponding to a resource reserved by UE-C (e.g., RSRP measured based on SCI format 1-A of UE-C) is equal to or less than a (pre-) configured threshold (when a resource collision between the reserved resources is determined). That is, UE-A may determine that a collision occurs between the resource reserved by UE-B and the resource reserved by UE-C and transmit the resource collision indicator.

[0373] For example, UE-A may not send a resource collision indicator (when a resource collision between reserved resources is determined) if the RSRP measurement values ​​corresponding to the resources reserved by UE-C (e.g., RSRP measured based on SCI format 1-A of UE-C) excluding the RSRP measurement values ​​corresponding to the resources reserved by UE-B (e.g., RSRP measured based on SCI format 1-A of UE-B) are equal to or exceed a (pre-) set threshold. That is, UE-A may determine that no collision occurs between the resources reserved by UE-B and the resources reserved by UE-C, and may not send the resource collision indicator.

[0374] For example, in the above example, UE-B may have multiple reserved resources, in which case the sum of the RSRP measurements may be set as the denominator.

[0375] For example, the threshold may be set to different values ​​depending on the MCS value or its range obtained from the SCI indicating the reserved resources of the UE-C, or depending on the data rate, coding rate, or modulation order.

[0376] For example, UE-A may send a resource collision indicator when an RSRP measurement value (e.g., RSRP measured based on SCI format 1-A of UE-B) corresponding to a resource reserved by UE-B is greater than and / or equal to an RSRP threshold (when a resource collision between the reserved resources is determined). That is, UE-A may determine that a collision occurs between a resource reserved by UE-B and a resource reserved by UE-C and transmit the resource collision indicator. In this case, the RSRP threshold may be determined as follows: i) a priority value obtained in an SCI (e.g., SCI format 1-A) indicating the reserved resource by UE-C is used as a transmission priority, and ii) a priority value obtained in an SCI (e.g., SCI format 1-A) indicating the reserved resource by UE-B is used as a reception priority.

[0377] As a specific example, when UE-A is an intended receiver for UE-C's PSSCH transmission, if the RSRP measured based on UE-B's SCI (SCI format 1-A) is greater than the RSRP threshold, UE-A may determine that a collision has occurred between UE-B's reserved resources and UE-C's reserved resources. The RSRP threshold Th(pi, pj) may be one of the values ​​in an RSRP threshold list. The RSRP threshold may be determined based on the reception priority (prio_RX) and the transmission priority (prio_TX) in the RSRP threshold list (e.g., sl-Thres-RSRP-List or ThresPSCH-RSRP-List). As an example, an index i for determining the RSRP threshold Th(prio_RX, prio_TX) may be determined as follows:

[0378] JPEG0007737546000018.jpg12149

[0379] The index i may represent the i-th RSRP threshold in the RSRP threshold list, where the reception priority (prio_RX) may be set to the priority value of the SCI of UE-B, and the transmission priority (prio_TX) may be set to the priority value of the SCI of UE-C.

[0380] Conversely, when UE-A is an intended receiver for UE-B's PSSCH transmission, if the RSRP measured based on UE-C's SCI (SCI format 1-A) is greater than the RSRP threshold, UE-A may determine that a collision has occurred between UE-B's reserved resources and UE-C's reserved resources. The reception priority (prio_RX) for determining the RSRP threshold may be set to the priority value of UE-C's SCI, and the transmission priority (prio_TX) for determining the RSRP threshold may be set to the priority value of UE-B's SCI.

[0381] For example, UE-A may not send a resource collision indicator (when a resource collision between the reserved resources is determined) when the RSRP measurement value corresponding to the reserved resources of UE-B (e.g., RSRP measured based on SCI format 1-A of UE-B) is less than and / or equal to the RSRP threshold. That is, UE-A may determine that no collision occurs between the reserved resources of UE-B and the reserved resources of UE-C and not send the resource collision indicator. In this case, the RSRP threshold may be determined as follows: i) the priority value acquired by UE-C in the SCI (e.g., SCI format 1-A) indicating the reserved resources is used as the transmission priority, and ii) the priority value acquired by UE-B in the SCI (e.g., SCI format 1-A) indicating the reserved resources is used as the reception priority.

[0382] As a specific example, when UE-A is an intended recipient of UE-C's PSSCH transmission, if the RSRP measured based on UE-B's SCI (SCI format 1-A) is less than or equal to the RSRP threshold, it can be determined that no collision occurs between UE-B's reserved resources and UE-C's reserved resources. The RSRP threshold Th(pi, pj) can be one of the values ​​in an RSRP threshold list. The RSRP threshold can be determined based on the reception priority (prio_RX) and the transmission priority (prio_TX) of the values ​​in an RSRP threshold list (e.g., sl-Thres-RSRP-List or ThresPSCH-RSRP-List). As an example, an index i for determining the RSRP threshold Th(prio_RX, prio_TX) can be determined as follows:

[0383] i=prio_RX+(prio_TX-1)*8

[0384] The index i may represent the i-th RSRP threshold in the RSRP threshold list. In this case, the reception priority (prio_RX) is set to the priority value of the SCI of UE-B, and the transmission priority (prio TX ) may be set to the priority value of the SCI of the UE-C.

[0385] Conversely, when UE-A is the intended receiver for UE-B's PSSCH transmission, if the RSRP measured based on UE-C's SCI (SCI format 1-A) is less than or equal to the RSRP threshold, it can be determined that no collision occurs between UE-B's reserved resources and UE-C's reserved resources. RX ) is set to the priority value of the SCI of the UE-C, and the transmission priority (prio_ TX ) may be set to the priority value of UE-B's SCI.

[0386] The application of an operation related to determining whether or not there is a resource conflict based on the RSRP threshold determined based on the transmission / reception priority may be configured via a higher layer parameter. For example, the RSRP threshold determined based on the transmission / reception priority may be utilized based on the higher layer parameter sl-optionForCondition2-A-1 being set to 0 ("RSRP-ThresPerPriorities").

[0387] As an example, based on the setting of the upper layer parameter sl-optionForCondition2-A-1 to 1 ("RSRP-ThresWithRsrpMeasurement"), another threshold (e.g., deltaRSRPthreshold) may be utilized. For example, if UE-A is an intended receiver of UE-B's PSSCH, UE-A may determine that a collision occurs between UE-B's reserved resources and UE-C's reserved resources based on the RSRP value (RSRP2) measured based on UE-C's SCI being greater than the RSRP value (RSRP1) measured based on UE-B's SCI plus deltaRSRPthreshold (RSRP2>RSRP1+deltaRSRPthreshold). Conversely, if UE-A is the intended recipient of UE-C's PSSCH, UE-A can determine that a collision occurs between UE-B's reserved resources and UE-C's reserved resources based on the RSRP value (RSRP1) measured based on UE-B's SCI being greater than the RSRP value (RSRP2) measured based on UE-C's SCI plus delta RSRP threshold (RSRP1 > RSRP2 + delta-threshold). The delta RSRP threshold may be a value preset in UE-A.

[0388] In an embodiment of the present disclosure, if UE-A determines to send a resource conflict indicator, it may transmit it to UE-B and / or UE-C. For example, UE-A may transmit the resource conflict indicator preferentially to a terminal with a higher priority value (i.e., a terminal performing a transmission with a lower priority). As a specific example, it may be assumed that the priority value p1 acquired from UE-B's SCI format 1-A is greater than the priority value p2 acquired from UE-C's SCI format 1-A (p1 > p2). In this case, UE-A may transmit a resource conflict indicator (PSFCH with conflict information) to UE-B. As yet another example, it may be assumed that the priority value p1 acquired from UE-B's SCI format 1-A is equal to the priority value p2 acquired from UE-C's SCI format 1-A (p1 = p2). In this case, UE-A may transmit a resource conflict indicator (PSFCH with conflict information) to UE-B or UE-C.

[0389] For example, UE-A may preferentially send a resource conflict indicator to a terminal with a small number of allocated resources or allocated subchannels. For example, UE-A may preferentially send a resource conflict indicator to a terminal with a large number of allocated resources or allocated subchannels. For example, UE-A may preferentially send a resource conflict indicator to a terminal with a small MCS index value or converted spectral efficiency. For example, UE-A may preferentially send a resource conflict indicator to a terminal with a high MCS index value or converted spectral efficiency.

[0390] On the other hand, if UE-A decides to transmit a resource conflict indicator to UE-B and / or UE-C, UE-B and / or UE-C may also recognize the resource conflict and reselect resources corresponding to the resource conflict before transmitting the indicator. In this situation, transmission of the resource conflict indicator may be unnecessary. For example, after determining to transmit a resource conflict indicator to UE-B and / or UE-C, if UE-A recognizes that UE-B and / or UE-C have reselected resources corresponding to the resource conflict before actually transmitting the indicator, UE-A may cancel transmission of the resource conflict indicator. For example, UE-A may determine this situation based on the reserved resources indicated in the SCI transmitted by UE-B and / or UE-C before transmitting the resource conflict indicator (taking into account the processing time budget). In other words, UE-A may cancel (or drop) the transmission of the resource conflict indicator based on the SCI (indicated by the reserved resource) received from UE-B and / or UE-C prior to transmission of the resource conflict indicator.

[0391] In the embodiments of the present disclosure, the UE does not transmit a resource conflict indicator for an observed resource conflict, but the concept of the present invention can be extended and applied to the UE's use of the indicator when observing / determining whether a resource conflict exists. That is, the operation according to the embodiment related to canceling the transmission of the resource conflict indicator described above can be equally applied to the operation according to the embodiment for determining whether a resource conflict exists. In determining whether a resource conflict exists, UE-A can determine whether a conflict exists between reserved resources based on the SCI (reserved resources indicated by the SCI) further received from UE-B and / or UE-C.

[0392] The various embodiments herein can be combined with each other.

[0393] In a specific aspect, the operations of UE-A / UE-B / UE-C according to the above-described embodiments (e.g., operations related to transmitting and receiving a resource conflict indicator (PSFCH with conflict information)) may be processed by the devices of Figures 15 to 20 (e.g., processors 102, 202 of Figure 16) described below.

[0394] In addition, the operations of UE-A / UE-B / UE-C according to the above-mentioned embodiments (e.g., operations related to transmitting and receiving a resource conflict indicator (PSFCH with conflict information)) may be stored in a memory (e.g., 104, 204 in FIG. 16) in the form of instructions / programs (e.g., instructions, executable code) for driving at least one processor (e.g., 102, 202 in FIG. 16).

[0395] The above-described embodiment will now be described in detail from the perspective of the operation of the first terminal with reference to Fig. 13. The methods described below are only separated for the sake of convenience, and unless mutually exclusive, it goes without saying that some components of any one method may be substituted for some components of another method or may be combined with each other and applied.

[0396] FIG. 13 is a flowchart illustrating a method in which a first terminal transmits information regarding collision of reserved resources in a wireless communication system according to an embodiment of the present specification.

[0397] Referring to FIG. 13, in a wireless communication system according to one embodiment of the present specification, a method in which a first terminal transmits information regarding a collision of reserved resources may include a step of receiving an SCI related to a first reserved resource (S1310), a step of receiving an SCI related to a second reserved resource (S1320), a step of determining a collision between the first reserved resource and the second reserved resource (S1330), and a step of transmitting information regarding the collision (S1340).

[0398] In the following description with reference to FIG. 13, the terms "first terminal," "second terminal," and "third terminal" are defined as follows: "first terminal" may refer to a terminal (UE-A) that transmits information about a collision. "Second terminal" and "third terminal" may refer to terminals that can receive information about a collision. "Third terminal" may refer to a terminal different from the second terminal. Specifically, the second terminal may be UE-B or UE-C according to the above-described embodiment, and the third terminal may be UE-C or UE-B according to the above-described embodiment.

[0399] At S1310, the first terminal receives first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH) from the second terminal. The first SCI may be a first-stage SCI (SCI format 1-A) received via the physical sidelink control channel (PSCCH). Specifically, the first SCI is associated with resource allocation mode 2 (see (b) of FIG. 6).

[0400] The operation of receiving first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH) from a second terminal (100 / 200 in FIGS. 15-20) by a first terminal (100 / 200 in FIGS. 15-20) according to the above-described step S1310 may be realized by the apparatuses of FIGS. 15-20. For example, referring to FIG. 16, one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to receive first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH) from the second terminal 200.

[0401] At S1320, the first terminal receives a second SCI associated with second reserved resources for a PSSCH from the third terminal. The second SCI may be a first stage SCI (SCI format 1-A) received via a physical sidelink control channel (PSCCH). Here, the PSSCH may refer to a PSSCH different from the PSSCH of the second terminal. That is, the PSSCH of the third terminal may be classified as the second PSSCH, and the PSSCH of the second terminal may be classified as the first PSSCH. The second SCI is associated with resource allocation mode 2 ((b) of FIG. 6).

[0402] The first SCI and the second SCI may be received via a Physical Sidelink Control Channel (PSCCH). More specifically, the first SCI may be received via a first PSCCH, and the second SCI may be received via a second PSCCH.

[0403] The operation of the first terminal (100 / 200 in FIGS. 15 to 20) receiving the second SCI related to the second reserved resources for the PSSCH from the third terminal (100 / 200 in FIGS. 15 to 20) in accordance with S1320 described above may be realized by the apparatuses of FIGS. 15 to 20. For example, referring to FIG. 16, the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to receive the second SCI related to the second reserved resources for the PSSCH from the second terminal 200.

[0404] At S1330, the first terminal determines a conflict between the first reserved resource and the second reserved resource.

[0405] According to one embodiment, the collision may be determined based on i) a measured Reference Signal Received Power (RSRP) and ii) an RSRP threshold.

[0406] The measured RSRP may be based on an RSRP measured based on a first SCI or an RSRP measured based on the second SCI. In this case, the measured RSRP may include an RSRP measured based on a demodulation reference signal for a physical sidelink control channel (PSCCH DMRS) and / or a demodulation reference signal for a physical sidelink shared channel (PSSCH DMRS). For example, the measured RSRP may be an RSRP measured based on a first PSCCH DMRS and / or a first PSSCH DMRS associated with the first SCI. For example, the measured RSRP may be an RSRP measured based on a second PSCCH DMRS and / or a second PSSCH DMRS associated with the second SCI.

[0407] According to the prior art, when two reserved resources (UE-B, UE-C) are overlapped in the time and frequency domains, it is unclear which terminal's SCI (SCI format 1-A) UE-A uses to compare the RSRP measured with the RSRP threshold. That is, whether or not the reserved resources collide may be determined differently depending on whether UE-A uses the RSRP measured with the SCI of UE-B or the RSRP measured with the SCI of UE-C. Furthermore, the RSRP threshold for determining collision between reserved resources may be determined as different values ​​depending on the reception priority value and the transmission priority value. In particular, as described above, the RSRP threshold used may vary significantly depending on the setting of the transmission priority value, and therefore, whether or not the reserved resources collide may be determined differently. According to the prior art, it is unclear how to set the transmission priority value for determining the RSRP threshold, so it may be difficult to ensure accuracy in determining whether or not the reserved resources collide. To solve the above problem, the following embodiment may be considered.

[0408] According to one embodiment, the measured RSRP may be determined based on whether the first terminal is an intended receiver associated with the PSSCH of the second terminal or not, or whether it is an intended receiver associated with the PSSCH of the third terminal.

[0409] According to one embodiment, the RSRP threshold may be determined based on a reception priority value and a transmission priority value. Based on whether the first terminal is an intended receiver of the PSSCH (e.g., a second PSSCH) associated with the third terminal, the following operations may be applied: The collision may be determined based on the RSRP measured based on the first SCI and the RSRP threshold. The RSRP threshold may be determined based on a first priority value of the first SCI set as the reception priority value and a second priority value of the second SCI set as the transmission priority value. In this case, the priority value of each SCI may refer to the value of a priority field (Priority field, 3 bits).

[0410] According to one embodiment, the RSRP threshold may be determined based on a reception priority value and a transmission priority value. Based on whether the first terminal is an intended receiver of the PSSCH (e.g., a first PSSCH) associated with the second terminal, the following operations may be applied: The collision may be determined based on the RSRP measured based on the second SCI and the RSRP threshold. The RSRP threshold may be determined based on a second priority value of the second SCI set as the reception priority value and a first priority value of the first SCI set as the transmission priority value.

[0411] According to the above-described S1330, the operation of the first terminal (100 / 200 in FIGS. 15 to 20) determining a conflict between the first reserved resource and the second reserved resource may be realized by the apparatuses of FIGS. 15 to 20. For example, referring to FIG. 16, one or more processors 102 may control one or more transceivers 106 and / or one or more memories 104 to determine a conflict between the first reserved resource and the second reserved resource.

[0412] In S1340, the first terminal transmits information about the collision to the second terminal or the third terminal.

[0413] According to one embodiment, the collision information may be transmitted based on the Physical Sidelink Feedback Channel (PSFCH).

[0414] According to one embodiment, the resources for transmitting the PSFCH may be pre-configured or configured by the base station. For example, configuration information for the PSFCH resources may be pre-defined / configured when the first terminal is implemented. For example, configuration information for the PSFCH resources may be transmitted from the base station to the first terminal.

[0415] It is necessary to determine the target (terminal) to which the conflict information is transmitted. For example, if conflict information is transmitted to all terminals that have transmitted a first SCI (first stage) related to each reserved resource, resource reselection must be performed for all terminals, which is inefficient. For example, if a conflict resource is transmitted to any terminal among the terminals that have transmitted the first SCI, a terminal that performs a transmission with higher importance may have to reselect a resource. In this regard, the following embodiments may be considered.

[0416] According to one embodiment, the collision information may be transmitted to the terminal with the highest priority value of the SCI among the terminals that transmitted the SCI.

[0417] As an example, information about the collision can be transmitted to the second terminal based on the first priority value being greater than the second priority value.

[0418] The first priority value means the priority value of the first SCI transmitted by the second terminal, and the second priority value means the priority value of the second SCI transmitted by the third terminal.

[0419] As another example, information about the collision may be transmitted to the third terminal based on the second priority value being greater than the first priority value.

[0420] As yet another example, based on the first priority value and the second priority value being equal, the information about the collision may be transmitted to the second terminal or the third terminal.

[0421] The second or third terminal that receives the information about the collision may perform resource reselection. Specifically, the second or third terminal may reselect resources for a PSSCH (e.g., the first or second PSSCH) based on the information about the collision. In this case, other resources may be selected within a range excluding the reserved resource (the first or second reserved resource) where the collision occurred.

[0422] If the second or third terminal does not receive the collision information, the second or third terminal may transmit a PSSCH based on the reserved resource. Specifically, the second or third terminal can transmit a PSSCH (e.g., a first PSSCH or a second PSSCH) based on the reserved resource (a first reserved resource or a second reserved resource). In this case, the intended receiver of the PSSCH (e.g., a first PSSCH or a second PSSCH) may be the first terminal or a terminal different from the first terminal.

[0423] The operation of the first terminal (100 / 200 in FIGS. 15-20) transmitting information about the collision to the second or third terminal (100 / 200 in FIGS. 15-20) in accordance with the above-described S1340 can be realized by the devices of FIGS. 15-20. For example, referring to FIG. 16, one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104 to transmit information about the collision to the second or third terminal 200.

[0424] The above-described embodiment will now be described in detail from the perspective of the operation of the second terminal with reference to Figure 14. The methods described below are only separated for the sake of convenience, and unless mutually exclusive, some components of any one method may be substituted for some components of another method, or may be applied in combination with each other.

[0425] FIG. 14 is a flowchart illustrating a method for a second terminal to receive information regarding collision of reserved resources in a wireless communication system according to another embodiment of the present specification.

[0426] Referring to FIG. 14, in a wireless communication system according to another embodiment of the present specification, a method for a second terminal to receive information regarding a collision of reserved resources may include a step of transmitting an SCI related to the reserved resources (S1410) and a step of receiving information related to the collision (S1420).

[0427] In the following description of FIG. 14, the terms "first terminal," "second terminal," and "third terminal" are defined as follows: "first terminal" may refer to a terminal (UE-A) that transmits collision-related information; "second terminal" and "third terminal" may refer to terminals that can receive collision-related information; and "third terminal" may refer to a terminal different from the second terminal. Specifically, the second terminal may be UE-B or UE-C according to the above-described embodiment, and the third terminal may be UE-C or UE-B according to the above-described embodiment.

[0428] In the following, the operation of receiving collision information will be described mainly with reference to the operation of the second terminal. However, for the sake of convenience and to avoid redundant explanations, the operation of the second terminal (UE-B or UE-C) described below (S1410, S1420, etc.) may be interpreted / applied as the operation of the third terminal (UE-C or UE-B).

[0429] At S1410, the second terminal transmits first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH) to the first terminal. The first SCI may be a first stage SCI (SCI format 1-A) received via the physical sidelink control channel (PSCCH). Specifically, the first SCI may be associated with resource allocation mode 2 (FIG. 6(b)).

[0430] In accordance with the above-described step S1410, the operation of transmitting first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH) from the second terminal (100 / 200 in FIGS. 15-20) to the first terminal (100 / 200 in FIGS. 15-20) may be realized by the apparatuses of FIGS. 15-20. For example, referring to FIG. 16, one or more processors 202 may control one or more transceivers 206 and / or one or more memories 204 to transmit first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH) to the first terminal 100.

[0431] At this time, the third terminal transmits a second SCI related to a second reserved resource for the PSSCH to the first terminal. The second SCI may be a first stage SCI (SCI format 1-A) transmitted via a physical sidelink control channel (PSCCH). Here, the PSSCH may refer to a PSSCH different from the PSSCH of the second terminal. That is, the PSSCH of the third terminal may be classified as the second PSSCH, and the PSSCH of the second terminal may be classified as the first PSSCH. The second SCI may be associated with resource allocation mode 2 (FIG. 6(b)).

[0432] The first SCI and the second SCI may be transmitted via a Physical Sidelink Control Channel (PSCCH). More specifically, the first SCI may be transmitted via a first PSCCH, and the second SCI may be transmitted via a second PSCCH.

[0433] At S1420, the second terminal receives information regarding a conflict between the first reserved resource and a second reserved resource from the first terminal, the second reserved resource being associated with a second SCI for a PSSCH of the third terminal.

[0434] According to one embodiment, the collision information may be received based on a Physical Sidelink Feedback Channel (PSFCH).

[0435] The collision may be determined by the first terminal. According to one embodiment, the collision may be determined by the first terminal based on i) Reference Signal Received Power (RSRP) measured by the first terminal and ii) an RSRP threshold.

[0436] The measured RSRP may be based on an RSRP measured based on the first SCI or an RSRP measured based on the second SCI. In this case, the measured RSRP may include an RSRP measured based on a demodulation reference signal for a physical sidelink control channel (PSCCH DMRS) and / or a demodulation reference signal for a physical sidelink shared channel (PSSCH DMRS). For example, the measured RSRP may be an RSRP measured based on a first PSCCH DMRS and / or a first PSSCH DMRS associated with the first SCI. For example, the measured RSRP may be an RSRP measured based on a second PSCCH DMRS and / or a second PSSCH DMRS associated with the second SCI.

[0437] The RSRP threshold may be determined based on a receive priority value and a transmit priority value.

[0438] According to the prior art, when two reserved resources (UE-B, UE-C) are overlapped in the time and frequency domains, it is unclear whether UE-A uses the RSRP measured from the SCI (SCI format 1-A) of one UE to compare with the RSRP threshold. That is, whether or not the reserved resources collide may be determined differently depending on whether UE-A uses the RSRP measured from the SCI of UE-B or the RSRP measured from the SCI of UE-C. Furthermore, the RSRP threshold for determining collision between the reserved resources may be determined as different values ​​depending on the reception priority value and the transmission priority value. In particular, as described above, the RSRP threshold used may vary greatly depending on the value of the transmission priority value, and whether or not the reserved resources collide may be determined differently. According to the prior art, it is unclear how to set the transmission priority value for determining the RSRP threshold, so it may be difficult to ensure the accuracy of whether or not the reserved resources collide. To solve the above problem, the following embodiments may be considered.

[0439] According to one embodiment, the measured RSRP may be determined based on whether the first terminal is an intended receiver associated with the PSSCH of the second terminal, or whether the first terminal is an intended receiver associated with the PSSCH of a third terminal.

[0440] According to one embodiment, the RSRP threshold may be determined based on a reception priority value and a transmission priority value. Based on whether the first terminal is an intended receiver of the PSSCH (e.g., a second PSSCH) associated with the third terminal, the following operations may be applied: The collision may be determined based on the RSRP measured based on the first SCI and the RSRP threshold. The RSRP threshold may be determined based on a first priority value of the first SCI set as the reception priority value and a second priority value of the second SCI set as the transmission priority value. In this case, the priority value of each SCI may refer to the value of a priority field (Priority field, 3 bits).

[0441] According to one embodiment, the RSRP threshold may be determined based on a reception priority value and a transmission priority value. Based on whether the first terminal is an intended receiver of the PSSCH (e.g., a first PSSCH) associated with the second terminal, the following operations may be applied: The collision may be determined based on the RSRP measured based on the second SCI and the RSRP threshold. The RSRP threshold may be determined based on a second priority value of the second SCI set as the reception priority value and a first priority value of the first SCI set as the transmission priority value.

[0442] According to one embodiment, the resources for receiving the PSFCH may be pre-configured or configured by the base station. For example, configuration information for the PSFCH resources may be pre-defined / configured when the second terminal is implemented. For example, configuration information for the PSFCH resources may be transmitted from the base station to the second terminal.

[0443] It is necessary to determine the target (terminal) to which the information related to the collision is to be transmitted. For example, if all terminals that have transmitted first stage SCIs (firstSCIs) related to each reserved resource receive conflict information, all terminals must perform resource reselection, which is inefficient. For example, if a conflicting resource is transmitted to any terminal among the terminals that have transmitted the first stage SCIs (firstSCIs), the terminal performing a transmission with higher importance may have to reselect a resource. In this regard, the following embodiments may be considered.

[0444] According to one embodiment, the collision information may be transmitted to the terminal with the highest priority value of the SCI among the terminals that transmitted the SCI.

[0445] As an example, information about the collision may be transmitted to the second terminal based on the first priority value being greater than the second priority value.

[0446] The first priority value means the priority value of the first SCI transmitted by the second terminal, and the second priority value means the priority value of the second SCI transmitted by the third terminal.

[0447] As another example, information about the collision may be transmitted to the third terminal based on the second priority value being greater than the first priority value.

[0448] As yet another example, based on the first priority value and the second priority value being equal, the information about the collision may be transmitted to the second terminal or the third terminal.

[0449] That is, the operation of S1420 described above may be performed based on the first priority value being greater than the second priority value. Based on the second priority value being greater than the first priority value, a PSSCH (e.g., first PSSCH) transmission operation other than S1420 may be performed.

[0450] In other words, if the priority of the PSSCH transmission of the second terminal is lower than that of the third terminal, the second terminal can receive information about the collision from the first terminal. If the priority of the PSSCH transmission of the second terminal is higher than that of the third terminal, the second terminal can transmit the PSSCH based on pre-reserved resources. In this case, the intended receiver of the PSSCH can be the first terminal or a terminal different from the first terminal.

[0451] According to the above-described S1420, the operation of the second terminal (100 / 200 in FIGS. 15 to 20) receiving information regarding a conflict between the first reserved resource and the second reserved resource from the first terminal (100 / 200 in FIGS. 15 to 20) can be realized by the apparatuses of FIGS. 15 to 20. For example, referring to FIG. 16, one or more processors 202 can control one or more transceivers 206 and / or one or more memories 204 to receive information regarding a conflict between the first reserved resource and the second reserved resource from the first terminal 100.

[0452] The method may further include a resource reselection step. Specifically, the method may further include a step of performing resource reselection for the PSSCH based on the information about the collision. The second terminal that receives the information about the collision may perform resource reselection. Specifically, the second terminal may reselect resources for the PSSCH (e.g., a first PSSCH) based on the information about the collision. In this case, other resources may be selected within a range excluding the reserved resource (first reserved resource) where the collision occurred. The second terminal may transmit SCI based on the resources selected based on the resource reselection, and transmit the PSSCH from the resources reserved by the corresponding SCI.

[0453] If the second terminal does not receive the collision information, the second terminal may transmit a PSSCH based on the reserved resource. Specifically, the second terminal may transmit a PSSCH (e.g., a first PSSCH) based on the reserved resource (first reserved resource). In this case, the intended receiver of the PSSCH (e.g., the first PSSCH) may be the first terminal or a terminal different from the first terminal.

[0454] Although not shown in the figure, depending on whether or not the second terminal receives information about a collision, it can act according to 1) or 2) below.

[0455] 1) SCI transmission (S1410) - Receiving collision information (S1420) - Resource reselection

[0456] 2) SCI transmission (S1410) - PSSCH transmission based on reserved resources

[0457] An apparatus to which various embodiments of the present specification can be applied will now be described.

[0458] Although the configurations disclosed herein are not limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams of the present invention disclosed herein may be applied to various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0459] The following description will be given in more detail with reference to the accompanying drawings. In the following drawings and descriptions, the same reference numerals denote the same or corresponding hardware blocks, software blocks, or function blocks unless otherwise stated.

[0460] FIG. 15 illustrates a communication system 1 according to an embodiment of the present disclosure.

[0461] As shown in FIG. 15 , a communication system 1 applicable to the present invention includes wireless devices, base stations, and a network. Here, the wireless devices refer to devices that communicate using wireless connection technologies (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and may be referred to as communication / wireless / 5G devices. The wireless devices may include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an XR (eXtended Reality) device 100c, a handheld device 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI device / server 400. For example, the vehicles may include vehicles equipped with wireless communication capabilities, autonomous vehicles, vehicles capable of vehicle-to-vehicle communication, and the like. Here, the vehicles may include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices include Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR) devices, and may be implemented in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, etc. Mobile devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., laptops, etc.), etc. Home appliances include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a base station or network may be implemented as a wireless device, and a specific wireless device 100a may operate as a base station / network node for other wireless devices.

[0462] The wireless devices 100a to 100f may be connected to a network 300 via a base station 200. AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to an AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, or the like. The wireless devices 100a to 100f may communicate with each other via the base station 200 / network 300, but may also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Furthermore, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0463] Wireless communications / connections 150a, 150b, and 150c can be established between the wireless devices 100a to 100f and the base station 200, and between the base station 200 and the base station 200. Here, the wireless communication / connection may be performed via various wireless connection technologies (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and inter-base station communication 150c (e.g., relay, Integrated Access Backhaul (IAB)). Through the wireless communication / connections 150a, 150b, and 150c, a wireless device and a base station / wireless device, and a base station and a base station can transmit / receive wireless signals to each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, based on various proposals in this specification, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. may be performed.

[0464] FIG. 16 illustrates a wireless device according to an embodiment of the present disclosure.

[0465] 16, the first wireless device 100 and the second wireless device 200 can transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device 100, the second wireless device 200} may correspond to {wireless device 100x, the base station 200} and / or {wireless device 100x, the wireless device 100x} in FIG. 17.

[0466] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and / or one or more antennas 108. The processor 102 is configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information / signals, and then transmit a wireless signal including the first information / signals via the transceiver 106. The processor 102 may also receive a wireless signal including second information / signals via the transceiver 106, and then store information obtained from signal processing of the second information / signals in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for performing some or all of the processes controlled by the processor 102 or for performing the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. Here, the processor 102 and the memory 104 may be part of a communications modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 106 may be connected to the processor 102 and may transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be referred to as a radio frequency (RF) unit. In this specification, a wireless device may also refer to a communications modem / circuit / chip.

[0467] The second wireless device 200 includes one or more processors 202, one or more memories 204, and may additionally include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may be configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information / signal, and then transmit a wireless signal including the third information / signal via the transceiver 206. The processor 202 may also receive a wireless signal including fourth information / signal via the transceiver 206, and then store information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for performing some or all of the processes controlled by the processor 202 or for performing the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. Here, the processor 202 and the memory 204 may be part of a communications modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 may be connected to the processor 202 and may transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be referred to as an RF unit. In this specification, a wireless device may also refer to a communications modem / circuit / chip.

[0468] The hardware elements of the wireless devices 100, 200 will be described in more detail below. Without limitation, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP, etc.). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 may generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, suggestions, and / or methods disclosed herein to the one or more transceivers 106, 206. The one or more processors 102, 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein.

[0469] The one or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. As an example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein may be included in one or more processors 102, 202 or stored in one or more memories 104, 204 and executed by one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions and / or collections of instructions.

[0470] One or more memories 104, 204 may be coupled to one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may comprise ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0471] One or more transceivers 106, 206 may transmit user data, control information, wireless signals / channels, etc., as referred to in the methods and / or operational flowcharts herein, to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts herein, from one or more other devices. For example, one or more transceivers 106, 206 may be connected to one or more processors 102, 202 and may transmit and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Furthermore, one or more transceivers 106, 206 may be connected to one or more antennas 108, 208, and the one or more transceivers 106, 206 may be configured to transmit and receive user data, control information, wireless signals / channels, etc., referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein via the one or more antennas 108, 208. In this document, one or more antennas may refer to multiple physical antennas (e.g., antenna ports). The one or more transceivers 106, 206 may convert received wireless signals / channels, etc., from RF band signals to baseband signals for processing using one or more processors 102, 202. The one or more transceivers 106, 206 may convert user data, control information, wireless signals / channels, etc., processed using one or more processors 102, 202, from baseband signals to RF band signals. To this end, one or more of the transceivers 206, 206 may include (analog) oscillators and / or filters.

[0472] FIG. 17 illustrates a signal processing circuit for a transmit signal according to an embodiment of the present disclosure.

[0473] Referring to FIG. 17, the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a free coder 1040, a resource mapper 1050, and a signal generator 1060. Although not limited thereto, the operations / functions of FIG. 19 may be performed by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 18. The hardware elements of FIG. 19 may be implemented by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 18. For example, the blocks 1010 to 1060 may be implemented by the processors 102, 202 of FIG. 18. Furthermore, the blocks 1010 to 1050 may be implemented by the processors 102, 202 of FIG. 18, and the block 1060 may be implemented by the transceivers 106, 206 of FIG. 18.

[0474] The codeword can be converted into a radio signal via the signal processing circuit 1000 of FIG. 19. Here, the codeword is an encoded bit sequence of an information block. The information block can include a transmission block (e.g., a UL-SCH transmission block, a DL-SCH transmission block). The radio signal can be transmitted via various physical channels (e.g., a PUSCH, a PDSCH).

[0475] Specifically, the codeword may be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence used for scrambling may be generated based on an initialization value, which may include ID information of the wireless device, etc. The scrambled bit sequence may be modulated into a sequence of modulation symbols by the modulator 1020. Modulation schemes may include pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature Amplitude Modulation (m-QAM), etc. The sequence of complex modulation symbols may be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbols of each transmission layer may be mapped to the corresponding antenna port by the free coder 1040 (free coding). The output z of the free coder 1040 may be obtained by multiplying the output y of the layer mapper 1030 by an N*M precoding matrix W, where N is the number of antenna ports and M is the number of transmission layers. Here, the free coder 1040 may perform free coding after performing transform free coding (e.g., DFT transform) on the complex modulation symbols, or may perform free coding without performing transform precoding.

[0476] The resource mapper 1050 can map modulation symbols for each antenna port to time-frequency resources. The time-frequency resources can include multiple symbols (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and multiple subcarriers in the frequency domain. The signal generator 1060 generates wireless signals from the mapped modulation symbols, and the generated wireless signals can be transmitted to other devices via each antenna. To this end, the signal generator 1060 can include an inverse fast fourier Transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), a frequency uplink converter, etc.

[0477] The signal processing process for a received signal in a wireless device may be configured as the reverse of the signal processing processes (1010 to 1060) of FIG. 19. For example, a wireless device (e.g., 100 or 200 of FIG. 18) may receive a wireless signal from the outside through an antenna port / transceiver. The received wireless signal may be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Thereafter, the baseband signal may be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword may be restored to the original information block through decoding. Therefore, a signal processing circuit (not shown) for the received signal may include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0478] Figure 18 illustrates a wireless device according to an embodiment of the present specification. The wireless device can be implemented in various forms depending on the use case / service (see Figure 17).

[0479] 18 , wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 18 and may be configured with various elements, components, units, and / or modules. For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and / or one or more memories 104 and 204 of FIG. 18. For example, the transceiver 114 may include one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 of FIG. 18. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls the operations of the wireless device. For example, the control unit 120 can control the electrical / mechanical operations of the wireless device based on the programs / codes / instructions / information stored in the memory unit 130. In addition, the control unit 120 can transmit information stored in the memory unit 130 to an external device (e.g., another communication device) via the communication unit 110 through a wireless / wired interface, and can store information received from an external device (e.g., another communication device) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0480] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. The wireless device may be realized in the form of, but not limited to, a robot (FIG. 22, 100a), a vehicle (FIG. 22, 100b-1, 100b-2), an XR device (FIG. 22, 100c), a mobile device (FIG. 22, 100d), a home appliance (FIG. 22, 100e), an IoT device (FIG. 22, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a FinTech device (or financial device), a security device, a climate / environment device, an AI server / device (FIG. 22, 400), a base station (FIG. 22, 200), a network, a node, or the like. The wireless device may be mobile or fixed depending on the use case / service.

[0481] 18, various elements, components, units / sections, and / or modules within wireless devices 100 and 200 may be entirely connected to each other via a wired interface, or at least some of them may be connected wirelessly via communication unit 110. For example, within wireless devices 100 and 200, control unit 120 and communication unit 110 may be connected via a wired interface, and control unit 120 and a first unit (e.g., 130, 140) may be connected wirelessly via communication unit 110. Furthermore, each element, component, unit / section, and / or module within wireless devices 100 and 200 may further include one or more elements. For example, control unit 120 may be configured with a set of one or more processors. For example, control unit 120 may be configured with a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 may be composed of a random access memory (RAM), a dynamic RAM (DRAM), a read only memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0482] The implementation of FIG. 18 will be described in more detail below with reference to the drawings.

[0483] 19 illustrates an example of a mobile device to which the present invention is applied. The mobile device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), or a handheld computer (e.g., a notebook). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0484] 19, portable device 100 includes antenna unit 108, communication unit 110, control unit 120, and memory unit 130, which may include power supply unit 140a, interface unit 140b, and input / output unit 140c. Antenna unit 108 may be configured as a part of communication unit 110. Blocks 110 to 130 and 140a to 140c correspond to blocks 110 to 130 and 140 in FIG. 18, respectively.

[0485] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from other wireless devices and base stations. The control unit 120 can control the components of the mobile device 100 to perform various operations. The control unit 120 can include an AP (Application Processor). The memory unit 130 can store data, parameters, programs, codes, and instructions required to operate the mobile device 100. The memory unit 130 can also store input / output data / information. The power supply unit 140a supplies power to the mobile device 100 and can include a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support connection between the mobile device 100 and other external devices. The interface unit 140b can include various ports (e.g., audio input / output ports, video input / output ports) for connection with external devices. The input / output unit 140c can receive and output video information / signals, audio information / signals, data, and / or information input by a user. The input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0486] For example, in the case of data communication, the input / output unit 140c may acquire information / signals (e.g., touch, text, voice, image, video) input by a user, and the acquired information / signals may be stored in the memory unit 130. The communication unit 110 may convert the information / signals stored in the memory into wireless signals and transmit the converted wireless signals directly to another wireless device or to a base station. In addition, the communication unit 110 may receive wireless signals from another wireless device or a base station and restore the received wireless signals to the original information / signals. The restored information / signals may be stored in the memory unit 130 and then output in various forms (e.g., text, voice, image, video, etc.) via the input / output unit 140c.

[0487] 20 illustrates a vehicle or an autonomous vehicle according to an embodiment of the present specification. The vehicle or autonomous vehicle may be a mobile robot, a car, a train, an aerial vehicle (AV), a ship, or the like.

[0488] 20, a vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 is configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 20, respectively.

[0489] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 controls elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The driving unit 140a enables the vehicle or autonomous vehicle 100 to travel on the ground. The driving unit 140a includes an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuits, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The automatic driving unit 140d can realize a technology for maintaining a lane while driving, a technology for automatically adjusting speed like adaptive cruise control, a technology for automatically driving along a predetermined route, a technology for automatically setting a route and driving when a destination is set, etc.

[0490] For example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a driving plan based on the acquired data. The control unit 120 controls the driving unit 140a (e.g., adjusting speed / direction) so that the vehicle or autonomous vehicle 100 moves along the autonomous driving route according to the driving plan. During autonomous driving, the communication unit 110 non-periodically acquires the latest traffic information data from an external server and acquires surrounding traffic information data from surrounding vehicles. Also, during autonomous driving, the sensor unit 140c acquires vehicle status and surrounding environment information. The autonomous driving unit 140d can update the autonomous driving route and driving plan based on the newly acquired data / information. The communication unit 110 transmits information regarding the vehicle position, autonomous driving route, driving plan, etc. to an external server. The external server can predict traffic information data in advance using AI technology based on information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0491] The claims described in this specification may be combined in various ways. For example, the technical features of the method claims in this specification may be combined to realize an apparatus, and the technical features of the apparatus claims in this specification may be combined to realize a method. Furthermore, the technical features of the method claims and the technical features of the apparatus claims in this specification may be combined to realize an apparatus, and the technical features of the method claims and the technical features of the apparatus claims in this specification may be combined to realize a method.

Claims

1. A method performed by a first UE (user equipment), receiving, from a second UE, first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH); receiving a second SCI associated with a second reserved resource for the PSSCH from a third UE; determining a collision between the first reserved resource and the second reserved resource; transmitting information related to the collision to the second UE or the third UE; The collision is i) a measured Reference Signal Received Power (RSRP), which is an RSRP measured based on the first SCI or an RSRP measured based on the second SCI; ii) an RSRP threshold determined based on the receiving priority value and the transmitting priority value; i) the measured RSRP, ii) the reception priority value, and iii) the transmission priority value are determined based on whether the first UE is an intended recipient associated with the PSSCH of the second UE or an intended recipient associated with the PSSCH of the third UE; based on the first UE being the intended recipient of the PSSCH associated with the third UE, i) the measured RSRP, ii) the reception priority value, and iii) the transmission priority value are determined as i) the measured RSRP based on the first SCI, ii) a first priority value of the first SCI, and iii) a second priority value of the second SCI; and, based on the first UE being the intended recipient of the PSSCH associated with the second UE, i) the measured RSRP, ii) the reception priority value, and iii) the transmission priority value are determined as i) the RSRP measured based on the second SCI, ii) the second priority value of the second SCI, and iii) the first priority value of the first SCI.

2. The method of claim 1 , wherein the first SCI and the second SCI are received via a Physical Sidelink Control Channel (PSCCH). Claim 3: Based on the first UE being the intended recipient of the PSSCH associated with the third UE, the collision is i) the RSRP measured based on the first SCI; and ii) the RSRP threshold determined based on the first priority value of the first SCI set as the receiving priority value and the second priority value of the second SCI set as the transmitting priority value. Claim 4: Based on the first UE being the intended recipient of the PSSCH associated with the second UE, the collision i) the RSRP measured based on the second SCI; and ii) the RSRP threshold determined based on the second priority value of the second SCI set as the receiving priority value and the first priority value of the first SCI set as the transmitting priority value.

5. The method of claim 3 or 4, wherein the information related to the collision is transmitted to the second UE based on the first priority value being greater than the second priority value.

6. The method of claim 3 or 4, wherein the information related to the collision is transmitted to the third UE based on the second priority value being greater than the first priority value.

7. The method of claim 3 or 4, wherein the information related to the collision is transmitted to the second UE or the third UE based on the first priority value being the same as the second priority value.

8. The method of claim 1 , wherein the measured RSRP includes RSRP measured based on a PSCCH demodulation reference signal (DMRS) and / or a PSSCH DMRS.

9. The method of claim 1 , wherein the information related to the collision is transmitted based on a Physical Sidelink Feedback Channel (PSFCH).

10. The method of claim 9 , wherein resources for transmission of the PSFCH are preconfigured or configured by a base station.

11. A first user equipment (UE) for transmitting information related to a collision of reserved resources in a wireless communication system, one or more transceivers; one or more processors configured to control the one or more transceivers; one or more memories operatively connected to the one or more processors; the one or more memories are configured to store instructions that perform operations upon being executed by the one or more processors; The operation is receiving, from a second UE, first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH); receiving a second SCI associated with a second reserved resource for the PSSCH from a third UE; determining a conflict between the first reserved resource and the second reserved resource; transmitting information related to the collision to the second UE or the third UE; The collision is i) a measured Reference Signal Received Power (RSRP), which is an RSRP measured based on the first SCI or an RSRP measured based on the second SCI; ii) an RSRP threshold determined based on the receiving priority value and the transmitting priority value; i) the measured RSRP, ii) the reception priority value, and iii) the transmission priority value are determined based on whether the first UE is an intended recipient associated with the PSSCH of the second UE or an intended recipient associated with the PSSCH of the third UE; based on the first UE being the intended recipient of the PSSCH associated with the third UE, i) the measured RSRP, ii) the reception priority value, and iii) the transmission priority value are determined as i) the measured RSRP based on the first SCI, ii) a first priority value of the first SCI, and iii) a second priority value of the second SCI; A first UE, wherein based on the first UE being the intended recipient of the PSSCH associated with the second UE, i) the measured RSRP, ii) the reception priority value, and iii) the transmission priority value are determined as i) the RSRP measured based on the second SCI, ii) the second priority value of the second SCI, and iii) the first priority value of the first SCI.

12. In a second UE (user equipment), one or more transceivers; one or more processors configured to control the one or more transceivers; one or more memories operatively connected to the one or more processors; the one or more memories are configured to store instructions that perform operations upon being executed by the one or more processors; The operation is transmitting, to a first UE, first sidelink control information (SCI) related to first reserved resources for a physical sidelink shared channel (PSSCH); receiving information related to a collision between the first reserved resource and the second reserved resource from the first UE; the second reserved resource is associated with a second SCI for a PSSCH of a third UE; The collision is i) a Reference Signal Received Power (RSRP) measured by the first UE, the RSRP being measured based on the first SCI or the RSRP being measured based on the second SCI; and ii) an RSRP threshold determined based on a receiving priority value and a transmitting priority value; i) the measured RSRP, ii) the reception priority value, and iii) the transmission priority value are determined based on whether the first UE is an intended recipient associated with the PSSCH of the second UE or an intended recipient associated with the PSSCH of the third UE; based on the first UE being the intended recipient of the PSSCH associated with the third UE, i) the measured RSRP, ii) the reception priority value, and iii) the transmission priority value are determined as i) the measured RSRP based on the first SCI, ii) a first priority value of the first SCI, and iii) a second priority value of the second SCI; A second UE, wherein based on the first UE being the intended recipient of the PSSCH associated with the second UE, i) the measured RSRP, ii) the reception priority value, and iii) the transmission priority value are determined as i) the RSRP measured based on the second SCI, ii) the second priority value of the second SCI, and iii) the first priority value of the first SCI.

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