Method and apparatus for sidelink communication using reserved resources in a communication system

Abstract

A method and apparatus for sidelink communication using reserved resources in a communication system are disclosed. An operation method of a first terminal can include the steps of generating SCI including a first information element indicating whether there is transmission of SL data #1 using a reserved resource after transmission of SL data #0; transmitting the SCI to a second terminal; and transmitting the SL data #0 to the second terminal based on the SCI.

Description

Technical Field

[0001] This disclosure relates to a sidelink communication technique, and more specifically, to a technique for sidelink communication using reserved resources. Background Technology

[0002] To handle the surge in wireless data following the commercialization of fourth-generation (4G) communication systems (e.g., Long Term Evolution (LTE) and LTE-Advanced (LTE-A) systems), fifth-generation (5G) communication systems (e.g., New Radio (NR) systems) are being considered, utilizing both 4G frequency bands (e.g., below 6 GHz) and higher frequency bands (e.g., above 6 GHz). 5G systems can support Enhanced Mobile Broadband (eMBB), Ultra-Reliable and Low-Latency Communication (URLLC), and Massive Machine-Type Communication (mMTC), among others.

[0003] 4G and 5G communication systems can support vehicle-to-everything (V2X) communication (e.g., sidelink communication). V2X communication supported in cellular communication systems such as 4G and 5G can be referred to as "Cellular-V2X (C-V2X) communication." V2X communication (e.g., C-V2X communication) can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, and so on.

[0004] In cellular communication systems, V2X communication (e.g., C-V2X communication) can be performed based on sidelink communication technologies (e.g., proximity-based service (ProSe) communication, device-to-device (D2D) communication, etc.). For example, a sidelink channel can be established for vehicles participating in V2V communication, and this sidelink channel can be used for communication between vehicles. Configured grant (CG) resources can be used to perform sidelink communication. CG resources can be configured periodically, and they can be used to send periodic data (e.g., periodic sidelink data).

[0005] On the other hand, reserved resources can be used to perform sidelink communication. Reserved resources can be pre-configured. Depending on the communication situation, reserved resources may not be used, and in this case, resource utilization efficiency may decrease.

[0006] The purpose of this disclosure in order to solve the above problems is to provide a method and apparatus for sidelink communication using reserved resources. Summary of the Invention

[0007] According to a first exemplary embodiment of the present disclosure for achieving this purpose, an operation method of a first terminal may include: generating side link control information (SCI) including a first information element indicating whether there is a transmission of SL data #1 utilizing reserved resources after the transmission of side link (SL) data #0; sending the SCI to a second terminal; and sending SL data #0 to the second terminal based on the SCI.

[0008] The first information element is set to either a first value or a second value. A first information element set to the first value can indicate that there is a transmission of SL data #1 utilizing reserved resources, while a first information element set to the second value can indicate that there is no transmission of SL data #1 utilizing reserved resources or that reserved resources are released after the transmission of SL data #0.

[0009] The SCI may further include a second information element indicating whether the transmission of SL data #0 is a preemptive transmission. This second information element is set to either a first value or a second value. A second information element set to the first value indicates that the transmission of SL data #0 is not a preemptive transmission, while a second information element set to the second value indicates that the transmission of SL data #0 is a preemptive transmission.

[0010] SCI may further include a third information element indicating reserved resources for the transmission and reception of SL data #0.

[0011] SCI may include a first-stage SCI and a second-stage SCI, wherein the first-stage SCI may further include a fourth information element indicating whether the second-stage SCI is used in side-link communication according to the broadcast scheme.

[0012] The maximum N can be reserved through SCI. max One resource, N max It can be set by the base station, and N max It can be a natural number.

[0013] Reserved resources can be configured by the first terminal or base station.

[0014] According to a second exemplary embodiment of the present disclosure for achieving this purpose, an operation method of a second terminal may include: receiving side link control information (SCI) from a first terminal; receiving side link (SL) data #0 from the first terminal based on the SCI; and performing an SL data #1 reception operation based on a first information element indicating whether there is a transmission of SL data #1 utilizing reserved resources after the transmission of SL data #0, the first information element being included in the SCI.

[0015] A first information element set to a first value can indicate that there is a transmission of SL data #1 utilizing reserved resources, while a first information element set to a second value can indicate that there is no transmission of SL data #1 utilizing reserved resources or that reserved resources are released after the transmission of SL data #0.

[0016] SCI may further include a second information element indicating whether the transmission of SL data #0 is a preemptive transmission. The second information element set to a first value can indicate that the transmission of SL data #0 is not a preemptive transmission, and the second information element set to a second value can indicate that the transmission of SL data #0 is a preemptive transmission.

[0017] SCI may further include a third information element indicating reserved resources for the transmission and reception of SL data #0.

[0018] SCI may include a first-stage SCI and a second-stage SCI, wherein the first-stage SCI may further include a fourth information element indicating whether the second-stage SCI is used in side-link communication according to the broadcast scheme.

[0019] According to a third exemplary embodiment of the present disclosure for achieving this purpose, a first terminal may include: a processor; and a memory storing one or more instructions executable by the processor, wherein the one or more instructions are executed to: generate sidelink control information (SCI) including a first information element indicating whether there is a transmission of SL data #1 utilizing reserved resources after the transmission of sidelink (SL) data #0; transmit the SCI to a second terminal; and transmit SL data #0 to the second terminal based on the SCI.

[0020] A first information element set to a first value can indicate that there is a transmission of SL data #1 utilizing reserved resources, while a first information element set to a second value can indicate that there is no transmission of SL data #1 utilizing reserved resources or that reserved resources are released after the transmission of SL data #0.

[0021] SCI may further include a second information element indicating whether the transmission of SL data #0 is a preemptive transmission. The second information element set to a first value can indicate that the transmission of SL data #0 is not a preemptive transmission, and the second information element set to a second value can indicate that the transmission of SL data #0 is a preemptive transmission.

[0022] SCI may further include a third information element indicating reserved resources for the transmission and reception of SL data #0.

[0023] SCI may include a first-stage SCI and a second-stage SCI, wherein the first-stage SCI may further include a fourth information element indicating whether the second-stage SCI is used in side-link communication according to the broadcast scheme.

[0024] According to exemplary embodiments of this disclosure, a transmitting terminal can send sidelink control information (SCI) to a receiving terminal, and can send sidelink (SL) data to the receiving terminal based on the SCI. The SCI may include information indicating whether there is a possibility of sending SL data utilizing reserved resources after the current SL data transmission, information indicating whether the current SL data transmission is a preemptive transmission, and / or information indicating reserved resources. Therefore, sidelink communication can be effectively performed based on the information included in the SCI, and the performance of the communication system can be improved. Attached Figure Description

[0025] Figure 1 This is a conceptual diagram illustrating a V2X communication scenario.

[0026] Figure 2 This is a conceptual diagram illustrating a first exemplary embodiment of a cellular communication system.

[0027] Figure 3 This is a conceptual diagram illustrating a first exemplary embodiment of a communication node constituting a cellular communication system.

[0028] Figure 4 This is a block diagram illustrating a first exemplary embodiment of the user plane protocol stack of a UE performing sidelink communication.

[0029] Figure 5 This is a block diagram illustrating a first exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication.

[0030] Figure 6 This is a block diagram illustrating a second exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication.

[0031] Figure 7 This is a sequence diagram illustrating a first exemplary embodiment of a sidelink communication method in a communication system. Detailed Implementation

[0032] While this disclosure may have various modifications and alternatives, specific embodiments are shown by way of example and described in detail in the accompanying drawings. However, it should be understood that this description is not intended to limit the disclosure to the specific embodiments, but rather, the disclosure is intended to cover all modifications, equivalents, and alternatives that fall within the spirit and scope of this disclosure.

[0033] Although the terms “first,” “second,” etc., may be used herein for various elements, these elements should not be construed as being limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and a second element may be referred to as a first element. The term “and / or” includes any and all combinations of one or more of the related listed items.

[0034] What will be understood is that when a component is referred to as "connected" or "coupled" to another component, the component can be directly connected or coupled to the other component, or there may be intermediate components. Conversely, when a component is referred to as "directly connected" or "directly coupled" to another component, there are no intermediate components.

[0035] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that, when used herein, the terms “comprising,” “including,” “containing,” and / or “comprising” specify the presence of the stated feature, integer, step, operation, element, part, and / or combination thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof.

[0036] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0037] In the following description, preferred exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In describing the present disclosure, for ease of overall understanding, the same reference numerals are used throughout the description of the drawings to refer to the same elements, and repeated descriptions will be omitted.

[0038] Figure 1 This is a conceptual diagram illustrating a V2X communication scenario.

[0039] like Figure 1 As shown, V2X communication can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc. V2X communication can be supported by a cellular communication system (e.g., cellular communication system 140), and V2X communication supported by cellular communication system 140 can be referred to as "cellular-V2X (C-V2X) communication." Here, cellular communication system 140 can include 4G communication systems (e.g., LTE communication systems or LTE-A communication systems), 5G communication systems (e.g., NR communication systems), etc.

[0040] V2V communication can include communication between a first vehicle 100 (e.g., a communication node located in the first vehicle 100) and a second vehicle 110 (e.g., a communication node located in vehicle 110). Various driving information, such as speed, heading, time, and location, can be exchanged between the first vehicle 100 and vehicle 110 via V2V communication. For example, autonomous driving (e.g., platooning) can be supported based on the driving information exchanged via V2V communication. V2V communication supported in the cellular communication system 140 can be performed based on "sidelink" communication technologies (e.g., ProSe and D2D communication technologies). In this case, communication between the first vehicle 100 and the second vehicle 110 can be performed using at least one sidelink channel established between the first vehicle 100 and the second vehicle 110.

[0041] V2I communication can include communication between a first vehicle 100 (e.g., a communication node located in the first vehicle 100) and roadside infrastructure (e.g., a roadside unit (RSU)) 120. Infrastructure 120 may also include traffic lights or streetlights located on the roadside. For example, when performing V2I communication, communication can be performed between a communication node located in the first vehicle 100 and a communication node located in a traffic light. Traffic information, driving information, etc., can be exchanged between the first vehicle 100 and infrastructure 120 via V2I communication. V2I communication supported in the cellular communication system 140 can also be performed based on sidelink communication technologies (e.g., ProSe communication technology and D2D communication technology). In this case, a sidelink channel can be used to perform communication between the first vehicle 100 and infrastructure 120.

[0042] V2P communication can include communication between a first vehicle 100 (e.g., a communication node located in the first vehicle 100) and a person 130 (e.g., a communication node carried by the person 130). Driving information of the first vehicle 100 and motion information (such as speed, heading, time, position, etc.) of the person 130 can be exchanged between the first vehicle 100 and the person 130 via V2P communication. The communication node located in the first vehicle 100 or the communication node carried by the person 130 can generate a hazard warning based on the obtained driving and motion information to determine dangerous situations. V2P communication supported in the cellular communication system 140 can be performed based on sidelink communication technologies (e.g., ProSe communication technology and D2D communication technology, etc.). In this case, at least one sidelink channel can be used to perform communication between the communication node located in the first vehicle 100 or the communication node carried by the person 130.

[0043] V2N communication can be communication between a first vehicle 100 (e.g., a communication node located in the first vehicle 100) and a server connected via a cellular communication system 140 (e.g., a cellular communication network). V2N communication can be performed based on 4G communication technology (e.g., LTE or LTE-A as specified in the 3GPP standard) or 5G communication technology (e.g., NR as specified in the 3GPP standard). Alternatively, V2N communication can be performed based on Wireless Access in Vehicular Environments (WAVE) communication technology or Wireless Local Area Network (WLAN) communication technology as defined in IEEE 802.11, or on Wireless Personal Area Network (WPAN) communication technology as defined in IEEE 802.15.

[0044] On the other hand, the cellular communication system 140 that supports V2X communication can be configured as follows.

[0045] Figure 2 This is a conceptual diagram illustrating a first exemplary embodiment of a cellular communication system.

[0046] like Figure 2 As shown, a cellular communication system may include an access network, a core network, etc. The access network may include base station 210, repeater 220, user equipment (UE) 231 to 236, etc. UE 231 to UE 236 may include [missing information - likely related to a specific location or component]. Figure 1 The communication nodes in vehicles 100 and 110, located in Figure 1 Communication nodes in infrastructure 120 Figure 1 Personnel 130 carry communication nodes, etc. When the cellular communication system supports 4G communication technology, the core network may include a Serving Gateway (S-GW) 250, a Packet Data Network (PDN) Gateway (P-GW) 260, a Mobility Management Entity (MME) 270, etc.

[0047] When a cellular communication system supports 5G communication technology, the core network may include User Plane Function (UPF) 250, Session Management Function (SMF) 260, Access and Mobility Management Function (AMF) 270, etc. Alternatively, when the cellular communication system operates in Non-Stand Alone (NSA) mode, the core network consisting of S-GW 250, P-GW 260, and MME 270 can support both 4G and 5G communication technologies, while the core network consisting of UPF 250, SMF 260, and AMF 270 can support both 5G and 4G communication technologies.

[0048] Furthermore, when a cellular communication system supports network slicing technology, the core network can be divided into multiple logical network slices. For example, network slices that support V2X communication can be configured (e.g., V2V network slices, V2I network slices, V2P network slices, V2N network slices, etc.), and V2X communication can be supported through V2X network slices configured in the core network.

[0049] Communication nodes constituting a cellular communication system (e.g., base stations, repeaters, UEs, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) can perform communication by utilizing at least one of the following communication technologies: Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiplexing (OFDM), Filtered OFDM, Single-Carrier FDMA (SC-FDMA), Non-Orthogonal Multiple Access (NOMA), Generalized Frequency Division Multiplexing (GFDM), FilterBank Multi-Carrier (FBMC), and Universal Filtered Multi-Carrier (FBMC). Multi-Carrier (UFMC) technology and Space Division Multiple Access (SDMA) technology.

[0050] The communication nodes that constitute a cellular communication system (e.g., base stations, repeaters, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) can be configured as follows.

[0051] Figure 3 This is a conceptual diagram illustrating a first exemplary embodiment of a communication node constituting a cellular communication system.

[0052] like Figure 3 As shown, the communication node 300 may include at least one processor 310, a memory 320, and a transceiver 330 connected to a network for performing communication. Additionally, the communication node 300 may further include an input interface device 340, an output interface device 350, a storage device 360, etc. Each component included in the communication node 300 can communicate with each other when connected via a bus 370.

[0053] However, each component included in communication node 300 can be connected to processor 310 via a separate interface or a separate bus instead of the common bus 370. For example, processor 310 can be connected via a dedicated interface to at least one of memory 320, transceiver 330, input interface device 340, output interface device 350, and storage device 360. According to exemplary embodiments of this disclosure, processor 310 (e.g., computer, microprocessor, CPU, ASIC, circuit, logic circuit, etc.) and associated non-transitory memory storing software instructions that provide functionality for input interface device 340, output interface device 350, and storage device 360 ​​when executed by processor 310. In this document, memory and processor can be implemented as separate semiconductor circuits. Alternatively, memory and processor can be implemented as a single integrated semiconductor circuit. Processor can be implemented as one or more processors.

[0054] Processor 310 can execute at least one instruction stored in at least one of memory 320 and storage device 360. Processor 310 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor that performs methods according to embodiments of the present disclosure. Each of memory 320 and storage device 360 ​​may include at least one of volatile storage media and non-volatile storage media. For example, memory 320 may include at least one of read-only memory (ROM) and random access memory (RAM).

[0055] Refer again Figure 2 In the communication system, base station 210 can form a macro cell or a small cell, and can connect to the core network via ideal backhaul or non-ideal backhaul. Base station 210 can transmit signals received from the core network to UEs 231 to UE 236 and repeater 220, and can also transmit signals received from UEs 231 to UE 236 and repeater 220 to the core network. UEs #1 231, UE #2 232, UE #4 234, UE #5 235, and UE #6 236 can belong to the cell coverage area of ​​base station 210. UEs #1 231, UE #2 232, UE #4 234, UE #5 235, and UE #6 236 can connect to base station 210 by performing a connection establishment procedure with the base station. UE#1 231, UE#2 232, UE#4 234, UE#5 235 and UE#6 236 can communicate with base station 210 after connecting to base station 210.

[0056] Repeater 220 can connect to base station 210 and relay communication between base station 210 and UE#3 233 and UE#4 234. That is, repeater 220 can transmit signals received from base station 210 to UE#3 233 and UE#4 234, and can also transmit signals received from UE#3 233 and UE#4 234 to base station 210. UE#4 234 can be within the cell coverage area of ​​both base station 210 and repeater 220, while UE#3 233 can be within the cell coverage area of ​​repeater 220. That is, UE#3 233 can be located outside the cell coverage area of ​​base station 210. UE#3 233 and UE#4 234 can connect to repeater 220 by performing a connection establishment procedure. After connecting to repeater 220, UE#3 233 and UE#4 234 can communicate with repeater 220.

[0057] Base station 210 and repeater 220 can support multiple-input multiple-output (MIMO) technologies (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) communication technologies, carrier aggregation (CA) communication technologies, unlicensed band communication technologies (e.g., licensed assisted access (LAA), enhanced LAA (eLAA), etc.), and sidelink communication technologies (e.g., ProSe communication technology, D2D communication technology). UE#1 231, UE#2 232, UE#5 235, and UE#6 236 can perform operations corresponding to base station 210 and operations supported by base station 210. UE#3 233 and UE#4 234 can perform operations corresponding to repeater 220 and operations supported by repeater 220.

[0058] Here, base station 210 can be referred to as Node B (NB), Evolved Node B (eNB), Base Transceiver Station (BTS), Radio Remote Head (RRH), Transmission Reception Point (TRP), Radio Unit (RU), Roadside Unit (RSU), Radio Transceiver, Access Point, Access Node, etc. Repeater 220 can be referred to as small base station, relay node, etc. Each of UE#1 231 to UE#6 236 can be referred to as terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, On-Broad Unit (OBU), etc.

[0059] On the other hand, communication between UE#5 235 and UE#6 236 can be performed based on sidelink communication technologies (e.g., ProSe communication technology, D2D communication technology). Sidelink communication can be performed based on a one-to-one scheme or a one-to-many scheme. When using sidelink communication technology to perform V2V communication, UE#5 235 can be located at... Figure 1 The communication node in the first vehicle 100, UE#6 236, can be located in Figure 1 The communication node in vehicle #2 110. When performing V2I communication using sidelink communication technology, UE #5 235 can be located in Figure 1 The communication node in the first vehicle 100, UE#6 236, can be located in Figure 1 The communication node in infrastructure 120. When performing V2P communication using sidelink communication technology, UE#5 235 can be located in Figure 1 The communication node in the first vehicle 100, UE#6 236, can be Figure 1 The personnel numbered 130 and carried communication nodes.

[0060] Based on the location of the UEs participating in sidelink communication (e.g., UE#5 235 and UE#6 236), the application sidelink communication scenarios can be classified as shown in Table 1 below. For example, Figure 2 The sidelink communication scenario between UE#5 235 and UE#6 236 shown can be sidelink communication scenario #C.

[0061] [Table 1]

[0062]

[0063]

[0064] On the other hand, the user plane protocol stack of the UE performing sidelink communication (e.g., UE#5 235 and UE#6 236) can be configured as follows.

[0065] Figure 4 This is a block diagram illustrating a first exemplary embodiment of the user plane protocol stack of a UE performing sidelink communication.

[0066] like Figure 4 As shown, UE#5 235 can be Figure 2 The UE#5 235 and UE#6 236 shown can be Figure 2 The example shown is UE#6 236. The sidelink communication scenario between UE#5 235 and UE#6 236 can be one of the sidelink communication scenarios #A to #D in Table 1. The user plane protocol stack of each of UE#5 235 and UE#6 236 may include a Physical (PHY) layer, a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a Packet Data Convergence Protocol (PDCP) layer.

[0067] Sidelink communication between UE#5 235 and UE#6 236 can be performed using the PC5 interface (e.g., the PC5-U interface). Layer 2 identifiers (IDs) (e.g., source Layer 2 ID, destination Layer 2 ID) can be used for sidelink communication, and the Layer 2 ID can be an ID configured for V2X communication (e.g., V2X services). Additionally, hybrid Automatic Repeat Request (HARQ) feedback operations can be supported in sidelink communication, and RLC Acknowledged Mode (RLC AM) or RLC Unacknowledged Mode (RLC UM) can be supported.

[0068] On the other hand, the control plane protocol stack of the UE performing sidelink communication (e.g., UE#5 235 and UE#6 236) can be configured as follows.

[0069] Figure 5 This is a block diagram illustrating a first exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication. Figure 6 This is a block diagram illustrating a second exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication.

[0070] like Figure 5 and Figure 6 As shown, UE#5 235 can be Figure 2The UE#5 235 and UE#6 shown can be Figure 2 The sidelink communication scenario between UE#6 236 and UE#5 235 can be one of the sidelink communication scenarios #A to #D in Table 1. Figure 5 The control plane protocol stack shown can be a control plane protocol stack used for sending and receiving broadcast information (e.g., Physical Sidelink Broadcast Channel, PSBCH)).

[0071] Figure 5 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, and a Radio Resource Control (RRC) layer. Sidelink communication between UE#5 235 and UE#6 236 can be performed using a PC5 interface (e.g., a PC5-C interface). Figure 6 The control plane protocol stack shown can be a control plane protocol stack for one-to-one side link communication. Figure 6 The control plane protocol stack shown may include the PHY layer, MAC layer, RLC layer, PDCP layer, and PC5 signaling protocol layer.

[0072] On the other hand, the channels used in sidelink communication between UE#5 235 and UE#6 236 may include the Physical Sidelink Shared Channel (PSSCH), the Physical Sidelink Control Channel (PSCCH), the Physical Sidelink Discovery Channel (PSDCH), and the Physical Sidelink Broadcast Channel (PSBCH). The PSSCH can be used to send and receive sidelink data and can be configured in the UE (e.g., UE#5 235 or UE#6 236) via higher-layer signaling. The PSCCH can be used to send and receive sidelink control information (SCI) and can also be configured in the UE (e.g., UE#5 235 or UE#6 236) via higher-layer signaling.

[0073] PSDCH can be used in the discovery process. For example, a discovery signal can be sent via PSDCH. PSBCH can be used to send and receive broadcast information (e.g., system information). Additionally, demodulation reference signals (DMRS), synchronization signals, etc., can be used in sidelink communication between UE#5 235 and UE#6 236. Synchronization signals can include the primary sidelink synchronization signal (PSSS) and the secondary sidelink synchronization signal (SSSS).

[0074] On the other hand, the side link transmission modes (TM) can be classified as side link TM#1 to TM#4 as shown in Table 2 below.

[0075] [Table 2]

[0076] Side Link™ describe #1 Sending data using resources scheduled by the base station #2 UE transmits autonomously without base station scheduling. #3 In V2X communication, resources scheduled by the base station are used for transmission. #4 In V2X communication, the UE transmits autonomously without the need for base station scheduling.

[0077] When sidelink TM#3 or TM#4 is supported, each of UE#5 235 and UE#6 236 can utilize the resource pool configured by base station 210 to perform sidelink communication. The resource pool can be configured for each item in the sidelink control information and sidelink data.

[0078] The resource pool for sidelink control information can be configured based on RRC signaling procedures (e.g., dedicated RRC signaling procedures, broadcast RRC signaling procedures). The resource pool for receiving sidelink control information can be configured via a broadcast RRC signaling procedure. When sidelink TM#3 is supported, the resource pool for sending sidelink control information can be configured via a dedicated RRC signaling procedure. In this case, sidelink control information can be sent using resources scheduled by base station 210 within the resource pool configured by the dedicated RRC signaling procedure. When sidelink TM#4 is supported, the resource pool for sending sidelink control information can be configured via either a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, sidelink control information can be sent using resources autonomously selected by the UE (e.g., UE#5235 or UE#6236) within the resource pool configured by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0079] When sidelink TM#3 is supported, a resource pool for transmitting and receiving sidelink data does not need to be configured. In this case, sidelink data can be transmitted and received using resources scheduled by base station 210. When sidelink TM#4 is supported, a resource pool for transmitting and receiving sidelink data can be configured using a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, sidelink data can be transmitted and received using resources autonomously selected by the UE (e.g., UE#5 235 or UE#6 236) from the resource pool configured by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0080] The following describes a method for retransmitting sidelink data. In an exemplary embodiment, a HARQ response may be referred to as a "HARQ acknowledgment (ACK)". A HARQ response may indicate ACK or negate ACK (NACK). A downlink (DL) HARQ response may be a HARQ response to downlink data, an uplink (UL) HARQ response may be a HARQ response to uplink data, and a sidelink (SL) HARQ response may be a HARQ response to sidelink data.

[0081] Even when describing a method (e.g., signal transmission or reception) to be performed at a first communication node, the corresponding second communication node can also perform a method (e.g., signal reception or transmission) corresponding to the method performed at the first communication node. That is, when describing the operation of UE#1 (e.g., vehicle #1), its corresponding UE#2 (e.g., vehicle #2) can perform an operation corresponding to the operation of UE#1. Conversely, when describing the operation of UE#2, the corresponding UE#1 can perform an operation corresponding to the operation of UE#2. In the exemplary embodiments described below, the operation of the vehicle can be the operation of a communication node located within the vehicle.

[0082] In an exemplary embodiment, signaling can be one or a combination of two or more of higher-layer signaling, MAC signaling, and physical (PHY) signaling. Messages used for higher-layer signaling can be referred to as "high-layer messages" or "high-layer signaling messages." Messages used for MAC signaling can be referred to as "MAC messages" or "MAC signaling messages." Messages used for PHY signaling can be referred to as "PHY messages" or "PHY signaling messages." Higher-layer signaling can refer to the operation of sending and receiving system information (e.g., Master Information Block (MIB), System Information Block (SIB)) and / or RRC messages. MAC signaling can refer to the operation of sending and receiving MAC control elements (CE). PHY signaling can refer to the operation of sending and receiving control information (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI), SCI).

[0083] Sidelink signals can be synchronization signals and reference signals used for sidelink communication. For example, synchronization signals can be Synchronization Signal / Physical Broadcast Channel (SS / PBCH) blocks, Sidelink Synchronization Signals (SLSS), Primary Sidelink Synchronization Signals (PSSS), Secondary Sidelink Synchronization Signals (SSSS), etc. Reference signals can be Channel State Information-Reference Signals (CSI-RS), DMRS, Phase Tracking-Reference Signals (PT-RS), Cell Specific Reference Signals (CRS), Sounding Reference Signals (SRS), Discovery Reference Signals (DRS), etc.

[0084] Sidelink channels can be PSSCH, PSCCH, PSDCH, PSBCH, Physical Sidelink Feedback Channel (PSFCH), etc. Additionally, a sidelink channel can refer to a sidelink channel that includes sidelink signals mapped to specific resources within the corresponding sidelink channel. Sidelink communication can support broadcast, multicast, and unicast services.

[0085] Sidelink communication can be performed using either a single SCI scheme or a multi-SCI scheme. When using a single SCI scheme, data transmission (e.g., sidelink data transmission, sidelink-shared channel (SL-SCH) transmission) can be performed based on one SCI (e.g., a 1st-stage SCI). When using a multi-SCI scheme, two SCIs (e.g., a 1st-stage SCI and a 2nd-stage SCI) can be used to perform data transmission. SCIs can be transmitted on the PSCCH and / or PSSCH. When using a single SCI scheme, SCIs (e.g., 1st-stage SCIs) can be transmitted via the PSCCH. When using a multi-SCI scheme, a 1st-stage SCI can be transmitted on the PSCCH, and a 2nd-stage SCI can be transmitted on either the PSCCH or PSSCH. The 1st-stage SCI can be referred to as the "first-stage SCI," and the 2nd-stage SCI can be referred to as the "second-stage SCI."

[0086] Phase 1 SCI may include one or more of the following information elements: priority information, frequency resource allocation information, time resource allocation information, resource reservation period information, demodulation reference signal (DMRS) mode information, Phase 2 SCI format information, beta_offset indicator, number of DMRS ports, and modulation and coding scheme (MCS) information. Phase 2 SCI may include one or more of the following information elements: HARQ processor identifier (ID), redundancy version (RV), source ID, destination ID, CSI request information, area ID, and communication range requirements.

[0087] Figure 7 This is a sequence diagram illustrating a first exemplary embodiment of a sidelink communication method in a communication system.

[0088] like Figure 7 As shown, the communication system may include a transmitting terminal (e.g., a first terminal) and a receiving terminal (e.g., a second terminal). The transmitting terminal may be... Figure 2 The UE 235 shown can be a receiving terminal that is Figure 2 The UE 236 shown. The transmitting terminal and the receiving terminal can be connected with... Figure 3 The communication nodes 300 shown are configured identically or similarly. The transmitting and receiving terminals can support... Figures 4 to 6 The protocol stack shown.

[0089] The transmitting terminal can generate an SCI to perform sidelink communication with the receiving terminal (S701). The SCI may include a first-stage SCI and / or a second-stage SCI. The transmitting terminal may send the SCI to the receiving terminal on the PSCCH and / or PSSCH (S702). The receiving terminal can receive the SCI from the transmitting terminal by performing a monitoring operation on the PSCCH and / or PSSCH, and can identify the information elements included in the SCI. The transmitting terminal can send sidelink (SL) data to the receiving terminal based on the information elements included in the SCI (S703). SL data can be sent on the PSSCH indicated by the SCI. The receiving terminal can receive SL data from the transmitting terminal based on the information elements included in the SCI. In addition, the receiving terminal can perform the operation of receiving other SL data after receiving the SL data based on the information elements included in the SCI (e.g., the information elements described in Table 3 below).

[0090] The aforementioned SCI (e.g., the first-stage SCI and / or the second-stage SCI) may further include one or more information elements described in Table 3 below. That is, the information elements listed in Table 3 may be included in at least one of the first-stage SCI and the second-stage SCI. Here, "SL transmission" may be "transmission of SCI", "transmission of SL data", or "transmission of SCI + transmission of SL data scheduled by SCI".

[0091] [Table 3]

[0092]

[0093]

[0094] A fourth information element can be included in the first-stage SCI, and the size of the fourth information element can be 1 bit. The fourth information element can indicate whether a second-stage SCI associated with the first-stage SCI exists in sidelink communication according to the broadcast scheme. The maximum number of resources that can be reserved using one SCI can be defined as N. max The sending terminal can reserve n resources by utilizing one SCI. n can be defined as (1 ≤ n ≤ N). max ). n and N max Each of the n reserved resources can be a natural number. These n reserved resources can be periodic or aperiodic resources.

[0095] The base station can send an indication of the maximum number N of resources that can be reserved by utilizing one or more of the following: higher-layer signaling (e.g., system information, RRC messages, etc.), MAC signaling (e.g., MACCE), and PHY signaling (e.g., DCI format 3_0 and DCI format 3_1). maxThe reserved resources can be configured by the base station. In this case, the base station can send the configuration information of the reserved resources by utilizing one or more of higher-layer signaling, MAC signaling, and PHY signaling. PSCCH and / or PSSCH can be sent in n reserved resources. The first-stage SCI may include information elements indicating the order in which the reserved resources (e.g., transmission resources) are sent. The index of the reserved resources (e.g., transmission resources) can be set to 0 to N. max -1 one.

[0096] When there are insufficient bits to represent the index of reserved resources, these bits can indicate whether there is an SL transmission utilizing the reserved resources after the current SL transmission, rather than indicating the index of the reserved resources. For example, the first information element included in the SCI (e.g., the first-stage SCI and / or the second-stage SCI) can be configured as shown in Table 4 below.

[0097] [Table 4]

[0098]

[0099] The size of the first information element can be 1 bit. The first value can be 0 or 1, and the second value can be 1 or 0. The number of reserved resources, n, can be set in the first information element included in the SCI as shown in Table 5 below. Reserved resources #0 to #3 can be contiguous or non-contiguous resources.

[0100] [Table 5]

[0101]

[0102] When the number of reserved resources is 1 (i.e., n = 1), since no SL is sent after the SL sent in reserved resource #0, the first information element included in the SCI sent in reserved resource #0 (e.g., the first-stage SCI) can be set to 1. When the number of reserved resources is 2 (i.e., n = 2), the first information element included in the SCI sent in reserved resource #0 can be set to 0, and the first information element included in the SCI sent in reserved resource #1 can be set to 1.

[0103] When the number of reserved resources is 3 (i.e., n = 3), the first information element included in the SCI sent in reserved resources #0 and #1 can be set to 0, and the first information element included in the SCI sent in reserved resource #2 can be set to 1. When the number of reserved resources is 4 (i.e., n = 4), the first information element included in the SCI sent in reserved resources #0 to #2 can be set to 0, and the first information element included in the SCI sent in reserved resource #3 can be set to 1. Here, "SL sending exists" can mean that SL sending is performed. "SL sending does not exist" can mean that SL sending is not performed.

[0104] In another exemplary embodiment, the first information element can be set as shown in Table 6 below.

[0105] [Table 6]

[0106]

[0107] The size of the first information element can be 1 bit. The first value can be 0 or 1, and the second value can be 1 or 0. The number of reserved resources, n, can be set in the first information element included in the SCI as shown in Table 7 below. Reserved resources #0 to #3 can be contiguous or non-contiguous resources.

[0108] [Table 7]

[0109]

[0110] When the number of reserved resources is 2 (i.e., n=2), the first information element included in the SCI sent in reserved resource #0 can be set to 1. A first information element set to 1 indicates that SL transmission should not be performed in reserved resources after reserved resource #0. That is, a first information element set to 1 indicates the release of reserved resources.

[0111] When the number of reserved resources is 3 (i.e., n = 3), the first information element included in the SCI sent in reserved resource #1 can be set to 1. In this case, SL transmission can be performed up to reserved resource #1, and reserved resources after reserved resource #1 can be released. That is, SL transmission can be omitted in reserved resource #2.

[0112] When the number of reserved resources is 4 (i.e., n = 4), the first information element included in the SCI sent in reserved resource #1 can be set to 1. In this case, SL transmission can be performed up to reserved resource #1, and reserved resources after reserved resource #1 can be released. That is, SL transmission can be omitted in reserved resources #2 and #3.

[0113] The first information element defined in Table 4 can be sent in the last reserved resource during SL transmission. On the other hand, the first information element defined in Table 6 can be sent in any reserved resource during SL transmission.

[0114] On the other hand, the SCI (e.g., the first-stage SCI and / or the second-stage SCI) may include a second information element. The second information element may be configured as shown in Table 8 below.

[0115] [Table 8]

[0116] Second information element describe First value (e.g., 0) The first value can indicate that the current SL transmission is not a preemptive transmission. The second value (e.g., 1) The second value can indicate whether the current SL transmission is a preemptive transmission.

[0117] The second information element, set to the second value, indicates that urgent data will be sent instead of SL data in the reserved resources associated with the second information element. The size of the second information element can be 1 bit. The first value can be 0 or 1, and the second value can be 1 or 0. The number of reserved resources (n) can be considered as shown in Table 9 below for setting the second information element included in the SCI.

[0118] [Table 9]

[0119]

[0120]

[0121] A second information element set to 0 indicates that the current SL transmission is not preemptive. A second information element set to 1 indicates that the current SL transmission is preemptive. When the number of reserved resources is 2 (i.e., n = 2), the second information element included in the SCI transmitted in reserved resource #0 can be set to 1, and the second information element included in the SCI transmitted in reserved resource #1 can be set to 0. In this case, urgent data transmission can be performed in reserved resource #0, and normal data transmission (e.g., SL transmission) can be performed in reserved resource #1.

[0122] When the number of reserved resources is 3 (i.e., n = 3), the second information element included in the SCI sent in reserved resource #0 can be set to 0, the second information element included in the SCI sent in reserved resource #1 can be set to 1, and the second information element included in the SCI sent in reserved resource #2 can be set to 0. In this case, emergency data transmission can be performed in reserved resource #1, and normal data transmission (e.g., SL transmission) can be performed in reserved resources #0 and #2.

[0123] When the number of reserved resources is 4 (i.e., n = 4), the second information element included in the SCI sent in reserved resources #0 and #3 can be set to 0, and the second information element included in the SCI sent in reserved resources #1 and #2 can be set to 1. In this case, emergency data can be sent in reserved resources #1 and #2, and normal data (e.g., SL transmission) can be sent in reserved resources #0 and #3.

[0124] On the other hand, an SCI can reserve n resources (e.g., up to N). max (n reserved resources). These n reserved resources can be periodic or aperiodic resources. When performing SL transmissions (e.g., PSCCH and / or PSSCH transmissions) among the n reserved resources, information indicating the order in which the reserved resources perform SL transmissions among the n reserved resources can be included in the SCI (e.g., first-phase SCI and / or second-phase SCI). That is, the SCI can include information elements (e.g., third information elements) that explicitly or implicitly indicate the reserved resources for which SL transmissions are performed. The index of the reserved resources can be set to 0 to N. max -1 is one of them. The third information element included in SCI can be set as shown in Table 10 below.

[0125] [Table 10]

[0126] Third Information Element describe First value (e.g., 00) The first value can indicate the first reserved resource among the reserved resources. The second value (e.g., 01) The second value can indicate the second reserved resource in the reserved resources. The third value (e.g., 10) The third value can indicate the third reserved resource in the reserved resources. The fourth value (e.g., 11) The fourth value can indicate the fourth reserved resource in the reserved resources.

[0127] The size of the third information element can be 2 bits. In this case, the first value can be 00, the second value can be 01, the third value can be 10, and the fourth value can be 11. The number of reserved resources (n) can be set as shown in Table 11 below for the third information element included in the SCI.

[0128] [Table 11]

[0129]

[0130] When the number of reserved resources is 1 (i.e., n = 1), the third information element included in the SCI sent in reserved resource #0 can be set to 00, and the third information element set to 00 can indicate that SL transmission is performed in the first reserved resource. When the number of reserved resources is 2 (i.e., n = 2), the third information element included in the SCI sent in reserved resource #0 can be set to 00, and the third information element included in the SCI sent in reserved resource #1 can be set to 01. The third information element set to 01 can indicate that SL transmission is performed in the second reserved resource.

[0131] When the number of reserved resources is 3 (i.e., n = 3), the third information element included in the SCI sent in reserved resource #0 can be set to 00, the third information element included in the SCI sent in reserved resource #1 can be set to 01, and the third information element included in the SCI sent in reserved resource #2 can be set to 10. The third information element set to 10 can indicate that SL transmission is performed in the third reserved resource.

[0132] When the number of reserved resources is 4 (i.e., n = 4), the third information element included in the SCI sent in reserved resource #0 can be set to 00, the third information element included in the SCI sent in reserved resource #1 can be set to 01, the third information element included in the SCI sent in reserved resource #2 can be set to 10, and the third information element included in the SCI sent in reserved resource #3 can be set to 11. A third information element set to 11 can indicate that an SL transmission should be performed in the fourth reserved resource.

[0133] In another exemplary embodiment, the third information element included in the SCI may be configured as shown in Table 12 below.

[0134] [Table 12]

[0135]

[0136] The number of reserved resources, n, can be set as shown in Table 13 below, based on the third information element included in the SCI in Table 12. According to Table 13, a third information element set to 11 can indicate that the SL transmission in the current reserved resources is the last SL transmission.

[0137] [Table 13]

[0138]

[0139]

[0140] When the number of reserved resources is 2 (i.e., n = 2), the third information element included in the SCI sent in reserved resource #0 can be set to 00, and the third information element included in the SCI sent in reserved resource #1 (e.g., the last reserved resource) can be set to 11. When the number of reserved resources is 3 (i.e., n = 3), the third information element 0 included in the SCI sent in reserved resource #0 can be set to 00, the third information element included in the SCI sent in reserved resource #1 can be set to 01, and the third information element included in the SCI sent in reserved resource #2 (e.g., the last reserved resource) can be set to 11.

[0141] When the number of reserved resources is 4 (i.e., n=4), the third information element included in the SCI sent in reserved resource #0 can be set to 00, the third information element included in the SCI sent in reserved resource #1 can be set to 01, the third information element included in the SCI sent in reserved resource #2 can be set to 10, and the third information element included in the SCI sent in reserved resource #3 (e.g., the last reserved resource) can be set to 11.

[0142] In another exemplary embodiment, the number n of reserved resources can be set as shown in Table 14 below, with the third information element included in the SCI according to Table 12. According to Table 14, a third information element set to 11 can indicate the release of reserved resources. In this case, the third information element (e.g., a third information element set to 11) can be sent to any of the reserved resources.

[0143] [Table 14]

[0144]

[0145] When the number of reserved resources is 2 (i.e., n = 2), the third information element included in the SCI sent in reserved resource #0 can be set to 11. A third information element set to 11 can indicate that SL sending should not be performed in reserved resources after reserved resource #0. That is, a third information element set to 11 can indicate the release of reserved resources.

[0146] When the number of reserved resources is 3 (i.e., n = 3), the third information element included in the SCI sent in reserved resource #1 can be set to 11. In this case, SL transmission can be performed up to reserved resource #1, and reserved resources after reserved resource #1 can be released. That is, SL transmission can be omitted in reserved resource #2.

[0147] When the number of reserved resources is 4 (i.e., n = 4), the third information element included in the SCI sent in reserved resource #1 can be set to 11. In this case, SL transmission can be performed up to reserved resource #1, and reserved resources after reserved resource #1 can be released. That is, SL transmission can be omitted in reserved resources #2 and #3.

[0148] In the exemplary embodiment according to Table 14, the third information element set to 11 can be interpreted as indicating that no additional SL transmission is required. In this case, the reserved resource may not exist, and therefore the operation of releasing the reserved resource may not be performed.

[0149] On the other hand, an SCI (e.g., a first-stage SCI and / or a second-stage SCI) may include one or more of a first information element, a second information element, a third information element, and a fourth information element, or a combination of two or more of them. For example, an SCI may include a combination of a first information element (e.g., a first information element defined in Table 4 or Table 6) and a second information element (e.g., a second information element defined in Table 8). In this case, the SCI may include a 2-digit field corresponding to the combination of the first and second information elements. As another example, an SCI may include a combination of a second information element (e.g., a second information element defined in Table 8) and a third information element (e.g., a third information element defined in Table 10 or Table 12). In this case, the SCI may include a 3-digit field corresponding to the combination of the second and third information elements.

[0150] To reduce the overhead of the first-stage SCI, the exemplary embodiments described above can be extended by incorporating a second-stage SCI. For example, the first-stage SCI may include a first information element (e.g., a first information element defined in Table 4 or Table 6), and the second-stage SCI may include a second information element (e.g., a second information element defined in Table 8) and / or a third information element (e.g., a third information element defined in Table 10 or Table 12). Alternatively, the first-stage SCI may include a third information element (e.g., a third information element defined in Table 10 or Table 12), and the second-stage SCI may include a first information element (e.g., a first information element defined in Table 4 or Table 6) and / or a second information element (e.g., a second information element defined in Table 8).

[0151] Regardless of the type of transmission (e.g., broadcast, multicast, unicast), the first-stage SCI may include an indicator indicating whether the second-stage SCI associated with the first-stage SCI includes a first information element, a second information element, a third information element, and / or a fourth information element. The indicator may be 1 bit in size.

[0152] Exemplary embodiments of this disclosure can be implemented as program instructions executable by various computers and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or combinations thereof. The program instructions recorded on the computer-readable medium may be specifically designed and configured for this disclosure, or may be well-known and available to those skilled in the art of computer software.

[0153] Examples of computer-readable media may include hardware devices such as ROM, RAM, and flash memory, specifically configured to store and execute program instructions. Examples of program instructions include, for example, machine code generated by a compiler, and high-level language code that can be executed by a computer using an interpreter. The aforementioned exemplary hardware devices may be configured to operate as at least one software module to perform embodiments of this disclosure, and vice versa.

[0154] Although exemplary embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the spirit and scope of the present disclosure as set forth in the claims.

Claims

1. A method for operating a first terminal in a communication system, comprising: Receive resource information from the base station indicating one or more reserved resources; Generate side link control information (SCI) including a first information element, the first information element indicating whether there is a transmission of SL data #1 using the first reserved resource among the one or more reserved resources after the transmission of side link data #0. Send the SCI to the second terminal; and Based on the SCI, the SL data #0 is sent to the second terminal. The first information element is set to a first value or a second value. The first information element set to the first value indicates that there is a transmission of SL data #1 using the first reserved resource. The first information element set to the second value indicates that there is no transmission of SL data #1 using the first reserved resource or that the first reserved resource is released after the transmission of SL data #0.

2. The operating method according to claim 1, wherein, The SCI further includes a second information element indicating whether the transmission of SL data #0 is a preemptive transmission. The second information element is set to a first value or a second value. The second information element set to the first value indicates that the transmission of SL data #0 is not a preemptive transmission, and the second information element set to the second value indicates that the transmission of SL data #0 is a preemptive transmission.

3. The operating method according to claim 1, wherein, The SCI further includes a third information element indicating reserved resources for the transmission and reception of the SL data #0.

4. The operating method according to claim 1, wherein, The SCI includes a first-stage SCI and a second-stage SCI, wherein the first-stage SCI further includes a fourth information element indicating whether the second-stage SCI is used in side-link communication according to the broadcast scheme.

5. The operating method according to claim 1, wherein, The maximum N is reserved through the SCI. max One resource, N max Set by the base station, and N max It is a natural number.

6. A method for operating a second terminal in a communication system, comprising: The first terminal receives side link control information (SCI), which includes a first information element indicating whether there is a transmission of SL data #1 using one or more reserved resources after the transmission of side link data #0. Based on the SCI, receive the SL data #0 from the first terminal; In response to the first information element indicating that SL data #1 was transmitted using the first reserved resource after the transmission of SL data #0, a receiving operation for SL data #1 is performed using the first reserved resource. The first information element is set to a first value or a second value. The first information element set to the first value indicates that there is a transmission of SL data #1 using the first reserved resource. The first information element set to the second value indicates that there is no transmission of SL data #1 using the first reserved resource or that the first reserved resource is released after the transmission of SL data #0.

7. The operating method according to claim 6, wherein, The SCI further includes a second information element indicating whether the transmission of SL data #0 is a preemptive transmission. The second information element is set to a first value or a second value. The second information element set to the first value indicates that the transmission of SL data #0 is not a preemptive transmission, and the second information element set to the second value indicates that the transmission of SL data #0 is a preemptive transmission.

8. The operating method according to claim 6, wherein, The SCI further includes a third information element that indicates reserved resources for the transmission and reception of the SL data #0.

9. The operating method according to claim 6, wherein, The SCI includes a first-stage SCI and a second-stage SCI, wherein the first-stage SCI further includes a fourth information element indicating whether the second-stage SCI is used in side-link communication according to the broadcast scheme.

10. A first terminal in a communication system, comprising: processor; as well as The memory stores one or more instructions that can be executed by the processor. Wherein, one or more instructions are executed to: Receive resource information from the base station indicating one or more reserved resources; Generate side link control information (SCI) including a first information element, the first information element indicating whether there is a transmission of SL data #1 using the first reserved resource among the one or more reserved resources after the transmission of side link data #0. Send the SCI to the second terminal; and Based on the SCI, the SL data #0 is sent to the second terminal. The first information element is set to a first value or a second value. The first information element set to the first value indicates that there is a transmission of SL data #1 using the first reserved resource. The first information element set to the second value indicates that there is no transmission of SL data #1 using the first reserved resource or that the first reserved resource is released after the transmission of SL data #0.

11. The first terminal according to claim 10, wherein, The SCI further includes a second information element indicating whether the transmission of SL data #0 is a preemptive transmission. The second information element is set to a first value or a second value. The second information element set to the first value indicates that the transmission of SL data #0 is not a preemptive transmission, and the second information element set to the second value indicates that the transmission of SL data #0 is a preemptive transmission.

12. The first terminal according to claim 10, wherein, The SCI further includes a third information element indicating reserved resources for the transmission and reception of the SL data #0.

13. The first terminal according to claim 10, wherein, The SCI includes a first-stage SCI and a second-stage SCI, wherein the first-stage SCI further includes a fourth information element indicating whether the second-stage SCI is used in side-link communication according to the broadcast scheme.

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