Method and apparatus for paging in sidelink communication

Abstract

This invention discloses a paging method and apparatus in sidelink communication. An operation method of a transmitting terminal includes the following steps: receiving window configuration information from a base station; performing a first resource listening operation for sending a paging message within window A indicated by the window configuration information to determine a candidate resource P; performing an operation to select a P sending resource from the candidate resources within window B indicated by the window configuration information, and performing a second resource listening operation to send data associated with the paging message; and sending the paging message to a receiving terminal using the P sending resource.

Description

Technical Field

[0001] This disclosure relates to a sidelink communication technique, and more specifically, to a technique for resource sensing and selection for sending paging messages. 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 (e.g., sidelink communication), and the 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 periodic data (e.g., periodic sidelink data) can be sent using CG resources.

[0005] On the other hand, when using Resource Allocation (RA) Mode 2, sidelink resources need to be configured for sending paging messages and / or wake-up signals. When sending paging messages and / or wake-up signals from pre-configured sidelink resources without considering the current resource occupancy status, collisions may occur during the transmission of paging messages and / or wake-up signals. In this case, energy efficiency and reception performance in sidelink communication may degrade. Summary of the Invention

[0006] Technical issues

[0007] This disclosure, intended to address the above-mentioned problems, aims to provide a method and apparatus for sending paging messages in sidelink communication.

[0008] Technical solution

[0009] According to a first exemplary embodiment of the present disclosure for achieving the above objectives, an operation method of a transmitting terminal may include the following steps: receiving window configuration information from a base station; determining a paging (P) candidate resource by performing a first resource listening operation for sending a paging message within a window A indicated by the window configuration information; selecting a P transmission resource from the P candidate resources within a window B indicated by the window configuration information, and performing a second resource listening operation for sending data associated with the paging message; and sending the paging message to a receiving terminal using the P transmission resource.

[0010] The operation method may further include the following steps: selecting a D transmission resource from candidate data (D) resources within a C window indicated by window configuration information; and transmitting data to a receiving terminal using the D transmission resource, wherein the candidate D resource is determined by a second resource listening operation.

[0011] Windows A, B, and C can be configured independently of each other.

[0012] The window configuration information can include the time resource information of window A, window B, and window C.

[0013] A first window interval can be configured between windows A and B, and a second window interval can be configured between windows B and C. The time resource information of the first window interval and the time resource information of the second window interval can be included in the window configuration information.

[0014] You can configure window configuration information for each resource pool, and you can configure first window configuration information and second window configuration information for a resource pool.

[0015] One of the first window configuration information and the second window configuration information can be used, and the window configuration information can be determined based on at least one of the following conditions: the size of the data to be sent, the required delay, the priority of the data, or the priority of the sidelink service.

[0016] The operation method may further include the following steps: terminating window A in advance when the first resource listening operation is completed before the reference time configured by the base station.

[0017] Window B can begin at the early termination time of Window A, or at a time after the window interval from the early termination time of Window A.

[0018] Window A may be terminated early when one or more conditions are met, and one or more conditions may be determined based on at least one of the following: the size of the data sent, the required delay, the priority of the data, or the priority of the sidelink service.

[0019] When the early termination operation of window A is enabled by the base station, window A can be terminated early.

[0020] According to a second exemplary embodiment of the present disclosure for achieving the above-described objectives, an operation method of a transmitting terminal may include the following steps: receiving window configuration information from a base station; performing a first resource listening operation for transmitting a paging message and a second resource listening operation for transmitting data associated with the paging message within window #1 indicated by the window configuration information; selecting a P transmission resource from paging (P) candidate resources determined by the first resource listening operation within window #2 indicated by the window configuration information; selecting a D transmission resource from data (D) candidate resources determined by the second resource listening operation within window #2; transmitting the paging message to a receiving terminal in the P transmission resource; and transmitting data to the receiving terminal in the D transmission resource.

[0021] Window #1 can be terminated early if the first resource listening operation and the second resource listening operation are completed before the first reference time configured by the base station.

[0022] Window #2 can begin at the early termination time of Window #1, or at a time after the window interval from the early termination time of Window #1.

[0023] Window #1 may be terminated early when one or more conditions are met, and one or more conditions may be determined based on at least one of the following: the size of the data sent, the required delay, the priority of the data, or the priority of the sidelink service.

[0024] If at least one of the first resource listening operation and the second resource listening operation is not completed within the second reference time configured by the base station, window #1 can be reconfigured, and at least one operation can be performed within the reconfigured window #1.

[0025] The reconfigured window #1 can start from the second reference time, or from the second reference time, after the offset configured by the base station.

[0026] The window configuration information may include the time resource information of window #1 and window #2, and window #1 and window #2 can be configured independently of each other.

[0027] You can configure window configuration information for each resource pool, and you can configure first window configuration information and second window configuration information for a resource pool.

[0028] One of the first window configuration information and the second window configuration information can be used, and the window configuration information can be determined based on at least one of the following conditions: the size of the data to be sent, the required delay, the priority of the data, or the priority of the sidelink service.

[0029] Beneficial effects

[0030] According to this disclosure, windows (e.g., resource listening windows and / or resource selection windows) for paging procedures in sidelinks can be configured independently. For example, the transmitting terminal can perform resource listening operations for sending paging messages in window A, resource selection operations for sending paging messages and resource listening operations for sending data in window B, and resource selection operations for sending data in window C. Therefore, conflicts in sending paging messages in sidelink communication can be prevented. Furthermore, windows can be terminated early, thus improving the efficiency of sidelink resource utilization. Additionally, windows can be reconfigured, thereby increasing the probability of successful paging message transmission. Attached Figure Description

[0031] Figure 1 This is a conceptual diagram illustrating a V2X communication scenario.

[0032] Figure 2 This is a conceptual diagram illustrating a first exemplary embodiment of a cellular communication system.

[0033] Figure 3 This is a block diagram illustrating a first exemplary embodiment of a communication node forming a cellular communication system.

[0034] Figure 4 This is a block diagram illustrating a first exemplary embodiment of the user plane protocol stack of a UE performing sidelink communication.

[0035] Figure 5 This is a block diagram illustrating a first exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication.

[0036] Figure 6 This is a block diagram illustrating a second exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication.

[0037] Figure 7 This is a sequence diagram illustrating a first exemplary embodiment of a method for sending and receiving data according to a paging procedure in sidelink communication.

[0038] Figure 8 This is a conceptual diagram illustrating a first exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0039] Figure 9 This is a conceptual diagram illustrating a second exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0040] Figure 10 This is a conceptual diagram illustrating a third exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0041] Figure 11 This is a conceptual diagram illustrating a fourth exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0042] Figure 12 This is a conceptual diagram illustrating a fifth exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0043] Figure 13 This is a conceptual diagram illustrating a sixth exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication. Detailed Implementation

[0044] Because this disclosure can be modified in various ways and has multiple forms, specific exemplary embodiments will be shown in the accompanying drawings and described in detail in the specific implementation. However, it should be understood that this disclosure is not intended to be limited to the specific exemplary embodiments, but rather, on the other hand, this disclosure will cover all modifications, equivalents, and alternatives that fall within the spirit and scope of this disclosure.

[0045] Relational terms such as "first," "second," etc., may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this disclosure, a first component may be named a second component, and similarly, a second component may be named a first component. The term "and / or" refers to any one or a combination of a plurality of related and described items.

[0046] In exemplary embodiments of this disclosure, "at least one of A and B" may refer to "at least one of A or B" or "at least one of a combination of one or more of A and B". Additionally, "one or more of A and B" may refer to "one or more of A or B" or "one or more of a combination of one or more of A and B".

[0047] In exemplary embodiments of this disclosure, (re)transmission can mean “transmission”, “retransmission”, or “transmission and retransmission”, (re)configuration can mean “configuration”, “reconfiguration”, or “configuration and reconfiguration”, (re)connection can mean “connection”, “reconnection”, or “connection and reconnection”, and (re)access can mean “access”, “reaccess”, or “access and reaccess”.

[0048] When it is said that a component is "connected" or "linked" to another component, it should be understood that the component is directly "connected" or "linked" to the other component, or that other components may be placed in between. On the other hand, when it is said that a component is "directly connected" or "directly linked" to another component, it should be understood that no other components are placed in between.

[0049] The terminology used in this disclosure is for the purpose of describing specific exemplary embodiments only and is not intended to limit the disclosure. Singular expressions include plural expressions unless the context clearly specifies otherwise. In this disclosure, terms such as “comprising” or “having” are intended to indicate the presence of features, numbers, steps, operations, components, parts or combinations thereof described in the specification, but it should be understood that these terms do not preclude the possibility of the presence or addition of one or more features, numbers, steps, operations, components, parts or combinations thereof.

[0050] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms as defined in commonly used dictionaries should be interpreted as having a meaning that matches the context in this art. In this specification, unless explicitly defined, terms are not necessarily to be interpreted as having an ideal or overly formal meaning.

[0051] In the following description, the form of this disclosure will be described in detail with reference to the accompanying drawings. In order to facilitate a thorough understanding of this disclosure, the same reference numerals will refer to the same components throughout the description of the drawings, and repeated descriptions will be omitted.

[0052] Figure 1 This is a conceptual diagram illustrating a V2X communication scenario.

[0053] 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 140 (e.g., a cellular communication network), and V2X communication supported by the cellular communication system 140 can be referred to as "cellular-V2X (C-V2X) communication." Here, the cellular communication system 140 can include a 4G communication system (e.g., an LTE communication system or an LTE-A communication system), a 5G communication system (e.g., an NR communication system), etc.

[0054] V2V communication can refer to communication between vehicle #1 100 (e.g., a communication node located in vehicle #1 100) and vehicle #2 110 (e.g., a communication node located in vehicle #1 100). Various driving information, such as speed, heading, time, and location, can be exchanged between vehicles 100 and 110 via V2V communication. 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, a sidelink channel can be used to perform communication between vehicle 100 and vehicle 110.

[0055] V2I communication can refer to communication between vehicle #1 100 and roadside infrastructure (e.g., roadside unit (RSU)) 120. Infrastructure 120 may include traffic lights or streetlights located on the roadside. For example, when performing V2I communication, communication can be performed between communication nodes located in vehicle #1 100 and communication nodes located in traffic lights. Traffic information, driving information, etc., can be exchanged between vehicle #1 100 and infrastructure 120 via V2I communication. V2I communication supported in 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 vehicle #1 100 and infrastructure 120.

[0056] V2P communication can represent communication between vehicle #1 100 (e.g., a communication node located in vehicle #1 100) and person 130 (e.g., a communication node carried by person 130). Driving information of vehicle #1 100 and movement information of person 130, such as speed, direction, time, and location, can be exchanged between vehicle #1 100 and person 130 via V2P communication. The communication node located in vehicle #1 100 or the communication node carried by person 130 can determine dangerous situations based on the obtained driving and movement information, thereby generating a warning indicating danger. 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). In this case, a sidelink channel can be used to perform communication between the communication node located in vehicle #1 100 or the communication node carried by person 130.

[0057] V2N communication can refer to communication between vehicle #1 100 (e.g., a communication node located in vehicle #1 100) and cellular communication system 140 (e.g., a cellular communication network). V2N communication can be performed based on 4G communication technologies (e.g., LTE or LTE-A as specified in the 3GPP standard) or 5G communication technologies (e.g., NR as specified in the 3GPP standard). Furthermore, V2N communication can be performed based on communication technologies defined in IEEE 702.11 (e.g., Wireless Access in Vehicular Environments (WAVE) communication technology, Wireless Local Area Network (WLAN) communication technology, etc.) and communication technologies defined in IEEE 702.15 (e.g., Wireless Personal Area Network (WPAN) communication technology, etc.).

[0058] On the other hand, the cellular communication system 140 that supports V2X communication can be configured as follows.

[0059] Figure 2 This is a conceptual diagram illustrating a first exemplary embodiment of a cellular communication system.

[0060] 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 236 may include components located at... Figure 1 The communication nodes in vehicles 100 and 110, located 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.

[0061] 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.

[0062] 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.

[0063] 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), Wideband CDMA (WCDMA), 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), and Filter Bank Multicarrier. Multi-Carrier (FBMC) technology, Universal Filtered Multi-Carrier (UFMC) technology, and Space Division Multiple Access (SDMA) technology.

[0064] 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.

[0065] Figure 3 This is a block diagram illustrating a first exemplary embodiment of a communication node forming a cellular communication system.

[0066] 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 to perform communication. Furthermore, 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 be connected and communicate with each other via a bus 370.

[0067] However, the components included in communication node 300 can be connected to processor 310 via separate interfaces or separate buses instead of the common bus 370. For example, processor 310 can be connected via dedicated interfaces to at least one of memory 320, transceiver 330, input interface device 340, output interface device 350, and storage device 360.

[0068] Processor 310 can execute program instructions 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).

[0069] 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 236 and repeater 220, and can also transmit signals received from UEs 231 to 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 be within 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.

[0070] Repeater 220 can be connected to base station 210 and can relay communication between base station 210 and UE#3 233 and UE#4 234. That is, repeater 220 can send signals received from base station 210 to UE#3 233 and UE#4 234, and can also send 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. UE#3 233 and UE#4 234 can communicate with repeater 220 after connecting to it.

[0071] 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 technologies, D2D communication technologies). 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.

[0072] 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.

[0073] 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 vehicle #1 100, 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 vehicle #1 100, 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 vehicle #1100, UE#6 236 can be Figure 1 The personnel numbered 130 and carried communication nodes.

[0074] 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.

[0075] [Table 1]

[0076] Side link communication scenarios Location of UE#5 235 Location of UE#6 236 A Outside the coverage area of ​​base station 210 Outside the coverage area of ​​base station 210 B Within the coverage area of ​​base station 210 Outside the coverage area of ​​base station 210 C Within the coverage area of ​​base station 210 Within the coverage area of ​​base station 210 D Within the coverage area of ​​base station 210 Within the coverage area of ​​base station 210

[0077] 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.

[0078] Figure 4 This is a block diagram illustrating a first exemplary embodiment of the user plane protocol stack of a UE performing sidelink communication.

[0079] 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 scenario for sidelink communication 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 for 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, etc.

[0080] 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. Furthermore, 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.

[0081] 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.

[0082] 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.

[0083] 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)).

[0084] 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 used 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.

[0085] 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.

[0086] PSDCH can be used in the discovery process. For example, transmit signals can be sent via PSDCH. PSBCH can be used to send and receive broadcast information (e.g., system information). Furthermore, 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).

[0087] 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.

[0088] [Table 2]

[0089]

[0090]

[0091] 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.

[0092] 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.

[0093] 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 RRC signaling procedure or the broadcast RRC signaling procedure.

[0094] The sidelink communication method will now be described. Even when describing a method performed at a first communication node (e.g., signal transmission or reception), the corresponding second communication node can also perform a method corresponding to the method performed at the first communication node (e.g., signal reception or transmission). 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 in the vehicle.

[0095] 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), or SCI).

[0096] 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.

[0097] Sidelink channels can be PSSCH, PSCCH, PSDCH, PSBCH, Physical Sidelink Feedback Channel (PSFCH), etc. Furthermore, 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.

[0098] Sidelink communication can be performed using either a single SCI scheme or a multi-SCI scheme. When using a single SCI scheme, it can be based on one SCI (e.g., Phase 1 SCI (1...)). st -stage SCI) is used to perform data transmission (e.g., sidelink data transmission, sidelink-shared channel (SL-SCH) transmission). When using a multi-SCI scheme, two SCIs can be used (e.g., stage 1 SCI and stage 2 SCI). nd Data transmission is performed using a stage SCI. SCIs can be transmitted via PSCCH and / or PSSCH. When using a single SCI scheme, SCIs can be transmitted on the PSCCH (e.g., stage 1 SCI). When using a multi-SCI scheme, stage 1 SCIs can be transmitted on the PSCCH, and stage 2 SCIs can be transmitted on either the PSCCH or PSSCH. A stage 1 SCI can be referred to as "stage 1 SCI," and a stage 2 SCI can be referred to as "stage 2 SCI." The format of a stage 1 SCI can include SCI format 1-A, and the format of a stage 2 SCI can include SCI format 2-A and SCI format 2-B.

[0099] 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.

[0100] On the other hand, the receiving terminal can operate in RRC inactive mode, RRC idle mode, or sleep mode. When the transmitting terminal has data to be sent to the receiving terminal (e.g., sidelink data), the transmitting terminal can send a paging message and / or wake-up signal to the receiving terminal to inform it of the data's presence. The receiving terminal can receive the paging message and / or wake-up signal from the transmitting terminal. The receiving terminal can determine that the transmitting terminal has data to be sent to it based on the information included in the paging message and / or wake-up signal.

[0101] In this scenario, the operating state of the receiving terminal can transition to an RRC connection state. The receiving terminal operating in the RRC connection state can receive data from the sending terminal. This operation can be performed using sidelink resources configured according to Resource Allocation (RA) Mode 2. In an exemplary embodiment, the sending terminal can refer to a terminal that sends data, the receiving terminal can refer to a terminal that receives data, and the receiving terminal can be interpreted as "one or more receiving terminals." Methods for sending and receiving paging messages will be described in the following exemplary embodiments. The methods for sending and receiving paging messages can be applied in the same or similar manner as methods for sending and receiving wake-up signals. That is, in an exemplary embodiment, a paging message can be interpreted as a wake-up signal. A paging message can be used to imply that it includes a wake-up signal. For example, a paging message may include a wake-up signal.

[0102] [Exemplary Example 1]

[0103] The window that performs resource listening operations for sending paging messages (hereinafter referred to as "Window A"), the window that performs resource selection operations for sending paging messages and resource listening operations for sending data (e.g., data associated with paging messages) (hereinafter referred to as "Window B"), and the window that performs resource selection operations for sending data (hereinafter referred to as "Window C") can be configured independently.

[0104] Figure 7 This is a sequence diagram illustrating a first exemplary embodiment of a method for sending and receiving data according to a paging procedure in sidelink communication.

[0105] like Figure 7 As shown, the data transmission / reception method according to the paging procedure may include four steps (e.g., steps S701, S702, S703, and S704). As a preceding step, the transmitting terminal and / or receiving terminal may receive window configuration information from the base station. This window configuration information may include configuration information for window A, window B, and / or window C. The window configuration information may be configured using at least one of system information, RRC messages, MAC control elements (CE), or control information (e.g., downlink control information (DCI)).

[0106] When data to be sent to the receiving terminal exists, the sending terminal can perform a paging message transmission operation. For example, the sending terminal can perform a resource listening operation within window A (S701). The sending terminal can determine (e.g., detect or listen) paging (P) candidate resources by performing the resource listening operation. The sending terminal can select a P transmission resource from the P candidate resources within window B, and can send a paging message in the selected P transmission resource (S702). The receiving terminal can receive the paging message from the sending terminal and can determine that data exists in the sending terminal based on the information included in the paging message. In this case, the operating state of the receiving terminal can change from RRC inactive mode, RRC idle mode, or sleep mode to RRC connected mode.

[0107] After sending a paging message, the sending terminal can perform a resource listening operation for sending data within window B (S703). That is, both the resource selection operation for sending the paging message and the resource listening operation for sending data can be performed within window B. A paging message can be sent to indicate the presence of data. The data in step S703 can be associated with the paging messages in steps S701 and S702. The sending terminal can determine (e.g., detect or listen) candidate resources for data (D) by performing a resource listening operation. The sending terminal can select a D sending resource from the D candidate resources within window C, and can send data (e.g., sidelink data) in the selected D sending resource (S704). The receiving terminal can receive data from the sending terminal.

[0108] Specifically, the above four steps can be performed as follows. In step S701, when data to be sent to the receiving terminal appears, window A can be started. The sending terminal can detect available resources (e.g., candidate P resources) by performing a resource listening operation within window A. In step S702, window B can be configured, and the sending terminal can select a P sending resource from the candidate P resources within window B, and can use the P sending resource to send a paging message.

[0109] The receiving terminal can receive paging messages from the sending terminal by performing a monitoring operation in window B. The receiving terminal can identify the presence of data to be sent to the sending terminal based on the paging message. In this case, the receiving terminal can perform a PSCCH monitoring operation to receive the SCI used to schedule the corresponding data.

[0110] In step S703, the sending terminal can detect candidate resource D by performing a resource listening operation within window B. In step S704, window C can be configured, and the sending terminal can select transmission resource D from candidate resources D within window C, and can use transmission resource D to send data. The receiving terminal can receive data from the sending terminal.

[0111] The time and / or frequency resources for each of windows A, B, and C can be configured within the resource pool. Windows A, B, and C can be configured as follows.

[0112] Figure 8 This is a conceptual diagram illustrating a first exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0113] like Figure 8 As shown, window A can be configured in the time resources from T1 to T2, window B can be configured in the time resources from T3 to T4, and window C can be configured in the time resources from T5 to T6. The receiving terminal can perform PSCCH monitoring operations from the start time of window B (i.e., T3). T1 to T6 can refer to continuous or discontinuous time. Each of T1 to T6 can be represented as a transmission time interval (TTI), symbol index, subframe index, time slot index, or small time slot index. The symbol index can be an orthogonal frequency division multiplexing (OFDM) symbol index, an orthogonal frequency division multiple access (OFDMA) symbol index, a single carrier (SC)-frequency division multiplexing (FDM) symbol index, or a signal carrier-frequency division multiple access (SC-FDMA) symbol index. The frequency resources of windows A, B, and C can be configured to be the same or different from each other. Alternatively, the frequency resources of windows A, B, and C can be configured to partially overlap.

[0114] The window interval between the end time of window A (i.e., T2) and the start time of window B (i.e., T3) can be configured (hereinafter referred to as the "first window interval"). The window interval between the end time of window B (i.e., T4) and the start time of window C (i.e., T5) can be configured (hereinafter referred to as the "second window interval"). The above window intervals can be configured to be the same or different.

[0115] A base station can configure one or more information elements as defined in Table 3 below, and can transmit such information elements to a terminal (e.g., a transmitting terminal and / or a receiving terminal) using at least one of system information, RRC messages, MAC CE, or control information. A terminal can identify one or more information elements as defined in Table 3 below by receiving at least one of system information, RRC messages, MAC CE, or control information from the base station. Alternatively, one or more information elements as defined in Table 3 below can be configured by a transmitting terminal, and the transmitting terminal can transmit such information elements to a receiving terminal using at least one of RRC messages, MAC CE, or control information (e.g., SCI). A receiving terminal can identify one or more information elements as defined in Table 3 below by receiving at least one of RRC messages, MAC CE, or control information from the transmitting terminal.

[0116] [Table 3]

[0117] Information elements Time and / or frequency resource information in Window A Time and / or frequency resource information in Window B C window contains time and / or frequency resource information. First window interval Second window interval

[0118] Window A, window B, and window C can be configured for each resource pool. In an exemplary embodiment, a resource pool can be referred to as "RP".

[0119] [Table 4]

[0120] resource pool Window A Window B C window RP#1 X1 slot X2 slot X3 slot RP#1 X4 slot X5 slot X6 time slot RP#2 X7 slot X8 slot X9 slot RP#2 X10 time slot X11 slot X12 time slot

[0121] Referring to Table 4, the A, B, and C windows of each of RP#1 and RP#2 can be configured independently. In Table 4, the A, B, and C windows can be configured within the same frequency resource. When the A, B, and C windows are configured within different frequency resources, Table 4 may further include frequency resource information. In this case, frequency resources can be configured in units of subcarriers, subchannels, or resource blocks (RBs). That is, frequency resources can be represented by subcarrier indices, subchannel indices, or RB indices. A subchannel may include one or more subcarriers or one or more RBs. An RB can be a physical RB (PRB), a virtual RB (VRB), or a common RB (CRB). The frequency resource of each of the A, B, and C windows can be represented as its relative position (e.g., offset) to a reference resource in the resource pool.

[0122] When two resource pools (e.g., RP#1 and RP#2) are allocated (e.g., configured) in the transmitting terminal, windows A, B, and C, as defined in Table 4, can be configured. In Table 4, each of X1 to X12 can be a natural number. The time resources for each of windows A, B, and C can be indicated by the number of time slots. Alternatively, the time resources for each of windows A, B, and C can be configured in units of TTI, symbols, subframes, small time slots, milliseconds, or seconds. The sizes of the time resources for windows A, B, and C can be the same or different.

[0123] Referring to Table 4, a resource pool can be configured with two window configurations. For example, according to the first window configuration of RP#1, the time resources for window A can be configured in time slot X1, the time resources for window B can be configured in time slot X2, and the time resources for window C can be configured in time slot X3. According to the second window configuration of RP#1, the time resources for window A can be configured in time slot X4, the time resources for window B can be configured in time slot X5, and the time resources for window C can be configured in time slot X6.

[0124] When multiple window configurations exist for a resource pool, the transmitting terminal can use one of these window configurations based on specific conditions. The base station can configure specific conditions for the transmitting and / or receiving terminals using at least one of system information, RRC signaling, MAC CE, or control information. These specific conditions can be defined as shown in Table 5 below.

[0125] [Table 5]

[0126]

[0127] For example, when the size of the data to be sent from the sending terminal to the receiving terminal is greater than or equal to a threshold, the sending terminal can select a window configuration that includes a larger time resource from multiple window configurations in a resource pool. When the data has a high priority or requires a short delay, the sending terminal can select a window configuration that includes a smaller time resource from multiple window configurations in a resource pool. When multiple data transmission resources are needed, the sending terminal can select a window configuration that includes a larger time resource from multiple window configurations in a resource pool.

[0128] [Table 6]

[0129]

[0130] Figure 8The window intervals shown can be configured as shown in Table 6. Each of Y1 to Y4 can be configured in units of TTI, symbol, subframe, time slot, hourly slot, millisecond, or second. Multiple configuration values ​​can be configured for a single window interval (e.g., two configuration values). In this case, the transmitting terminal can use one of the multiple configuration values ​​based on specific conditions defined in Table 5. Alternatively, the first and second window intervals can have the same configuration value (e.g., time resource).

[0131] Figure 9 This is a conceptual diagram illustrating a second exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0132] like Figure 9 As shown, windows A, B, and / or C can be terminated early. Window A can be configured within the time resource from T1 to T2, and window A can be terminated early at T3, before T2. For example, if a resource listening operation is completed before T3, window A can be terminated early at T3. T3 can be used as a reference value for terminating window A early. When window A is terminated early, window B can start from the early termination time of window A (i.e., T3), and the transmitting terminal can perform resource selection operations for sending paging messages and resource listening operations for sending data within window B. Alternatively, when a first window interval is configured, window B can start after "T3 + first window interval".

[0133] A B window can be configured within the time resources from T3 to T4, and the B window can terminate early at a specific time before T4. For example, when the resource selection operation for sending paging messages and the resource listening operation for sending data are completed before the specific time, the B window can terminate early at the specific time. This specific time can be used as a reference value for terminating the B window early. When the B window is terminated early, the C window can start from the early termination time of the B window (i.e., the specific time), and the transmitting terminal can perform resource selection operations within the C window. Alternatively, when a second window interval is configured, the C window can start after "the specific time + the second window interval". The early termination operation of the above-mentioned window can be applied to the C window in the same or similar manner. The early termination time of the window can be configured as shown in Table 7 below. The base station can send the configuration information of the early termination time to the transmitting terminal and / or the receiving terminal using at least one of system information, RRC messages, MAC CE, or control information.

[0134] [Table 7]

[0135]

[0136] The transmitting terminal and / or receiving terminal can operate according to the configuration defined in Table 7. For example, the transmitting terminal can perform a resource listening operation in window A within RP#1. When the resource listening operation is completed within the (X1-Z1) time slot, the transmitting terminal can terminate window A early and can perform resource selection operations for sending paging messages and resource listening operations for sending data in window B configured in time slot X2. When a first window interval is configured, window B can start after the first window interval from the early termination time of window A.

[0137] When the resource selection operation for sending paging messages and the resource listening operation for sending data are completed within the X2-Z1 time slot, the transmitting terminal may terminate window B early and perform the resource selection operation for sending data in window C configured in time slot X3. When a second window interval is configured, window C may begin after the second window interval from the early termination time of window B.

[0138] The early termination operation of a window can be enabled or disabled by the base station. For example, when the base station sends a message indicating that the early termination operation of a window is enabled, the transmitting terminal can perform the early termination operation. On the other hand, when the base station sends a message indicating that the early termination operation of a window is disabled, the transmitting terminal can choose not to perform the early termination operation. The message indicating whether the early termination operation of a window is enabled or disabled can be sent through at least one of system information, RRC messages, MAC CE, or control information.

[0139] The early termination of a window can be performed when certain conditions are met. These conditions can be those defined in Table 5. The conditions can be configured by at least one of system information, RRC messages, MAC CE, or control information. For example, the transmitting terminal can perform the early termination of a window when the data has a higher priority than a reference priority (e.g., a reference priority configured by higher-layer signaling) or when the required delay is shorter than a reference delay (e.g., a reference delay configured by higher-layer signaling).

[0140] [Exemplary Example 2]

[0141] Two windows can be used to operate on the pager and data transmission windows, respectively. These two windows can be configured as follows.

[0142] Option 1: Window #1, where resource listening and resource selection operations for sending paging messages are performed; and Window #2, where resource listening and resource selection operations for sending data are performed.

[0143] - Option 2: Window #1, in which resource listening operations for sending paging messages and sending data are performed, and Window #2, in which resource selection operations for sending paging messages and sending data are performed.

[0144] In the following exemplary embodiments, window #1 may refer to window #1 according to scheme 1 or scheme 2, and window #2 may refer to window #2 according to scheme 1 or scheme 2.

[0145] The time offset from the start time to the end time of a window (e.g., window #1 and / or window #2) can be configured as shown in Table 8 below.

[0146] [Table 8]

[0147] Time offset Window #1 X Window #2 Y

[0148] The base station can send time offset configuration information to the transmitting terminal and / or receiving terminal using at least one of system information, RRC messages, MAC CE, or control information. In Table 8, each of X and Y can be configured in units of TTI, symbol, subframe, time slot, hourly slot, millisecond, or second. When using Scheme 1, the transmitting terminal can select a transmission resource within X from the start time of the resource listening operation and can use the selected transmission resource to send a paging message. The resource listening operation and resource selection operation for sending paging messages described above can be performed within window #1. Furthermore, the transmitting terminal can select a transmission resource within Y from the start time of the resource listening operation and can use the selected transmission resource to send data. The resource listening operation and resource selection operation for data described above can be performed within window #2.

[0149] When using Scheme 2, the sending terminal can perform resource listening operations for sending paging messages and data within X days from the start time of window #1. Furthermore, the sending terminal can perform resource selection operations for sending paging messages and data within Y days from the start time of window #2.

[0150] Figure 10 This is a conceptual diagram illustrating a third exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0151] like Figure 10As shown, window #1 can be configured in the time resources from T1 to T2. The time resources from T1 to T2 can be X (i.e., time offset) as defined in Table 8. Window #1 can be terminated early if the operation in window #1 is completed before a pre-configured time (e.g., reference time or specific time). Window #2 can be configured in the time resources from T3 to T4. The time resources from T3 to T4 can be Y (i.e., time offset) as defined in Table 8. In Scheme 1, when a paging message is received within window #1, the receiving terminal can start performing PSCCH monitoring operations from T3. Window #2 can be terminated early if the operation in window #2 is completed before a pre-configured time (e.g., reference time or specific time).

[0152] The time offset of window #1 can be configured to be equal to the time offset of window #2. In this case, a single time offset (e.g., a common time offset) can be used for both window #1 and window #2. Multiple time offsets can be configured for each of windows #1 and window #2. In this case, the transmitting terminal can select one of the multiple time offsets based on specific conditions and can utilize the selected time offset. The specific conditions can be those defined in Table 5. The specific conditions can be configured by at least one of system information, RRC information, MAC CE, or control information.

[0153] Figure 11 This is a conceptual diagram illustrating a fourth exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0154] like Figure 11 As shown, window #1 can be configured in the time resources from T1 to T2. Window #1 can be terminated early at T3 if the operation in window #1 is completed before T3. Window #2 can start from the early termination time of window #1 (i.e., T3). Alternatively, window #2 can start after a pre-configured window interval from the early termination time of window #1 (i.e., T3). In scheme 1, when a paging message is received, the receiving terminal can start performing PSCCH monitoring operations from T3. This PSCCH monitoring operation can be performed immediately after receiving the paging message.

[0155] A reference time (e.g., T3) for the early termination operation of the trigger window can be pre-configured. The base station can send the reference time for the early termination operation of the window to the transmitting terminal and / or the receiving terminal using at least one of system information, RRC information, MAC CE, or control information. If the operation in window #1 is not completed within the reference time, the transmitting terminal may not terminate window #1 early. If the operation in window #1 is completed within the reference time, the transmitting terminal may terminate window #1 early.

[0156] On the other hand, in embodiment 2, in scheme 1, the window can be initialized if the resource listening operation has not been completed by a certain time. Furthermore, in embodiment 2, the window can be initialized if the resource listening operation and / or resource selection operation have not been completed by a certain time. The initialization offset used to initialize the window can be configured as shown in Table 9 below.

[0157] [Table 9]

[0158] Time offset Initialize offset Window #1 X F1 Window #2 Y F2

[0159] The base station can send configuration information for the initialization offset to the transmitting terminal and / or the receiving terminal using at least one of system information, RRC messages, MAC CE, or control information. The initialization offset for window #1 can be configured independently of the initialization offset for window #2. Alternatively, the initialization offset for window #1 can be configured equal to the initialization offset for window #2. Multiple initialization offsets can be configured for each window within a resource pool. In this case, the transmitting terminal can select an initialization offset from the multiple initialization offsets based on specific conditions (e.g., the specific conditions defined in Table 5) and can utilize the selected initialization offset. In Table 9, each of F1 and F2 can be configured in units of TTIs, symbols, subframes, time slots, small time slots, milliseconds, or seconds.

[0160] Figure 12 This is a conceptual diagram illustrating a fifth exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0161] like Figure 12 As shown, when using Scheme 1, the transmitting terminal can perform resource listening and resource selection operations for sending paging messages in window #1. Window #1 can be configured within the time resource from T1 to T2. The length of the time resource from T1 to T2 can correspond to X as defined in Table 9. The resource listening operation can start from T1. T3 can be the time when the resource listening operation should be completed. If the resource listening operation is not completed within T3, the transmitting terminal can reconfigure window #1 based on T3. The reconfigured window #1 can start from T3. The value of (T3-T1) can be F1 (i.e., initialization offset) as defined in Table 9. The length of the reconfigured window #1 can be the same as the length of the previous window #1, and the start time of the reconfigured window #1 can be different from the start time of the previous window #1. The above operations can be applied similarly to window #2.

[0162] When using scheme 2, the transmitting terminal can perform resource listening operations for sending paging messages and for sending data in window #1. The aforementioned resource listening operations can begin at T1. T3 can be the time when the resource listening operations should complete. If at least one resource listening operation is not completed within T3, the transmitting terminal can reconfigure window #1 based on T3. In the reconfigured window #1, all resource listening operations or at least one resource listening operation that was not completed in the previous window #1 can be performed. The reconfigured window #1 can begin from T3. The value of (T3-T1) can be F1 (i.e., initialization offset) as defined in Table 9. The length of the reconfigured window #1 can be the same as the length of the previous window #1, and the start time of the reconfigured window #1 can be different from the start time of the previous window #1. The above operations can be applied similarly to window #2.

[0163] On the other hand, based on Table 9 and Figure 12 In an exemplary implementation, a listener termination offset may be additionally considered. The window initialization operation can be performed from the end time of the resource listener operation after the listener termination offset. The listener termination offset can be configured as shown in Table 10 below.

[0164] [Table 10]

[0165] Time offset Listening termination offset Initialize offset Window #1 X X1 F1 Window #2 Y Y1 F2

[0166] The base station can use at least one of system information, RRC messages, MAC CE, or control information to send the configuration information of the listening termination offset to the transmitting terminal and / or the receiving terminal. The listening termination offset of window #1 can be configured independently of the listening termination offset of window #2. Alternatively, the listening termination offset of window #1 can be configured to be equal to the listening termination offset of window #2.

[0167] Within a resource pool, multiple listen-to-stop offsets can be configured for each window. In this case, the transmitting terminal can select one listen-to-stop offset from the multiple listen-to-stop offsets based on specific conditions (e.g., the specific conditions defined in Table 5) and utilize that selected listen-to-stop offset. In Table 10, each of X1 and Y1 can be configured in units of TTIs, symbols, subframes, time slots, small time slots, milliseconds, or seconds.

[0168] Figure 13 This is a conceptual diagram illustrating a sixth exemplary embodiment of a window used for resource listening and / or resource selection operations in sidelink communication.

[0169] like Figure 13As shown, when using Scheme 1, the transmitting terminal can perform resource listening and resource selection operations for sending paging messages in window #1. Window #1 can be configured within the time resource from T1 to T2. The length of the time resource from T1 to T2 can correspond to X as defined in Table 10. The resource listening operation can start from T1. T3 can be the time when the resource listening operation should be completed. If the resource listening operation is not completed within T3, the transmitting terminal can reconfigure window #1 based on T4, which is the time after the initialization offset (e.g., F1 as defined in Table 10) from T3. The reconfigured window #1 can start at T4. The value of (T3-T1) can be X1 as defined in Table 10 (i.e., the listening termination offset), and the value of (T4-T3) can be F1 as defined in Table 10 (i.e., the initialization offset). The above operations can be applied similarly to window #2.

[0170] When using scheme 2, the transmitting terminal can perform resource listening operations for sending paging messages and for sending data in window #1. The aforementioned resource listening operations can begin at T1. T3 can be the time when the resource listening operations should complete. If at least one resource listening operation is not completed within T3, the transmitting terminal can reconfigure window #1 based on T4, where T4 is the time after the initialization offset (e.g., F1 as defined in Table 10) from T3. In the reconfigured window #1, all resource listening operations or at least one resource listening operation that was not completed in the previous window #1 can be performed. The reconfigured window #1 can begin at T4. The value of (T3-T1) can be X1 (i.e., the listening termination offset) as defined in Table 10, and the value of (T4-T3) can be F1 (i.e., the initialization offset) as defined in Table 10. The above operations can be applied similarly to window #2.

[0171] On the other hand, in the exemplary embodiments described above, the configuration values ​​(e.g., the values ​​defined in Tables 3 to 10) can be represented as an offset based on the start time of the resource listening operation. Alternatively, the reference time for the offset can be a time other than the start time of the resource listening operation (e.g., a time pre-configured by the base station). Among the values ​​defined in Tables 3 to 10, some values ​​can be fixed values ​​in the communication system, while the remaining values ​​can be configured by at least one of system information, RRC information, MAC CE, or control information. The values ​​defined in Tables 3 to 10 can be cell-specific information (e.g., common information of multiple terminals within a cell), RP-specific information (e.g., common information of an RP), or terminal-specific information. The values ​​defined in Tables 3 to 10 can be configured independently based on resource pool, service type, priority, power-saving operation state, quality of service (QoS) parameters (e.g., reliability, latency), and / or terminal type (e.g., vehicle (V)-UE or pedestrian (P)-UE). The values ​​defined in Tables 3 to 10 can be implicitly indicated based on pre-configured parameters.

[0172] 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.

[0173] Examples of computer-readable media may include specific 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 hardware devices may be configured to operate using at least one software module to perform embodiments of this disclosure, and vice versa.

[0174] Although exemplary embodiments of the present disclosure have been described in detail, it should be understood that those skilled in the art to which this invention pertains can make various modifications and alterations to the invention without departing from the spirit and scope of the present disclosure as set forth in the claims.

Claims

1. An operation method of a transmitting terminal, which is an operation method of a transmitting terminal in a communication system, comprising the steps of: receiving window configuration information from a base station; determining a paging candidate resource, i.e., a P candidate resource, by performing a first resource listening operation for transmitting a paging message within an A window indicated by the window configuration information; performing an operation of selecting a P transmission resource from the P candidate resource and performing a second resource listening operation for transmitting data associated with the paging message within a B window indicated by the window configuration information; and transmitting the paging message to a receiving terminal using the P transmission resource. 2.The operation method of claim 1, further comprising the steps of: selecting a D transmission resource from a data candidate resource, i.e., a D candidate resource, within a C window indicated by the window configuration information; and transmitting the data to the receiving terminal using the D transmission resource, wherein the D candidate resource is determined by the second resource listening operation. The A window, the B window, and the C window are configured independently of each other. The window configuration information includes time resource information of the A window, time resource information of the B window, and time resource information of the C window. A first window interval is configured between the A window and the B window, a second window interval is configured between the B window and the C window, and time resource information of the first window interval and time resource information of the second window interval are included in the window configuration information. The window configuration information is configured for each resource pool, and first window configuration information and second window configuration information are configured for one resource pool. One of the first window configuration information and the second window configuration information is used, and the one window configuration information is determined according to a condition based on at least one of a size of transmission data, a required delay, a priority of data, or a priority of a sidelink service. The A window is terminated early when the first resource listening operation is completed before a reference time configured by the base station. The B window starts at the early termination time of the A window or starts at a time after a window interval from the early termination time of the A window. The A window is terminated early when one or more conditions are satisfied, and the one or more conditions are determined based on at least one of a size of transmission data, a required delay, a priority of data, or a priority of a sidelink service. The A window is terminated early when an early termination operation of the A window is enabled by the base station.

3. The operating method of claim 2, wherein, 12.An operation method of a transmitting terminal, which is an operation method of a transmitting terminal in a communication system, comprising the steps of: receiving window configuration information from a base station; performing a first resource listening operation for transmitting a paging message and a second resource listening operation for transmitting data associated with the paging message within a window #1 indicated by the window configuration information; selecting a P transmission resource from a paging candidate resource, i.e., a P candidate resource, determined by the first resource listening operation within a window #2 indicated by the window configuration information; 4. The operating method of claim 2, wherein, ​ 5. The operating method of claim 2, wherein, ​ 6. The operating method of claim 1, wherein, ​ 7. The method of operation of claim 6, wherein, ​ 8. The method of operation of claim 1, further comprising the step of: ​ 9. The operating method of claim 8, wherein, ​ 10. The operating method of claim 8, wherein, ​ 11. The operating method of claim 8, wherein, ​ ​ ​ ​ ​ selecting, within the window #2, a D transmission resource from among data candidate resources, i.e., D candidate resources, determined by the second resource listening operation; transmitting the paging message to the reception terminal in the P transmission resource; and transmitting the data to the reception terminal in the D transmission resource.

13. The method of operation of claim 12, wherein, terminating the window #1 in advance when the first resource listening operation and the second resource listening operation are completed before a first reference time configured by the base station.

14. The method of operation of claim 13, wherein, the window #2 starts at a time after a window interval from a time of the termination in advance of the window #1.

15. The operating method of claim 13, wherein, terminating the window #1 in advance when one or more conditions are satisfied, and the one or more conditions are determined based on at least one of a size of transmission data, a required delay, a priority of data, or a priority of a sidelink service.

16. The method of operation of claim 12, wherein, reconfiguring the window #1 when at least one of the first resource listening operation and the second resource listening operation is not completed within a second reference time configured by the base station, and performing the at least one operation within the reconfigured window #1.

17. The method of operation of claim 16, wherein, the reconfigured window #1 starts from the second reference time, or starts from a time after an offset configured by the base station from the second reference time.

18. The method of operation of claim 12, wherein, the window configuration information includes time resource information of the window #1 and time resource information of the window #2, and the window #1 and the window #2 are configured independently of each other.

19. The method of operation of claim 12, wherein, the window configuration information is configured for each resource pool, and first window configuration information and second window configuration information are configured for one resource pool.

20. The method of operating according to claim 19, wherein, one of the first window configuration information and the second window configuration information is used, and the one window configuration information is determined according to a condition based on at least one of a size of transmission data, a required delay, a priority of data, or a priority of a sidelink service.

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