Method and apparatus for paging in sidelink communications

Abstract

A method and apparatus for paging in side link communication are disclosed. The operation method of a transmitting terminal includes the following steps: receiving SL paging setup information from a base station; receiving a paging DCI from the base station in an SPO indicated by the SL paging setup information; and sending a SL paging message to one or more receiving terminals in the side link resources indicated by the paging DCI.

Description

Technical Field

[0001] The present invention relates to a side link communication technology, and more particularly, to a paging technology for side link communication. Background Art

[0002] In order to handle the surge in wireless data after the commercialization of the fourth generation (4G) communication system (e.g., Long Term Evolution (LTE) communication system, Advanced LTE (LTE-A) communication system), not only the frequency band of the 4G communication system (e.g., the frequency band below 6 GHz) but also the fifth generation (5G) communication system (e.g., New Radio (NR) communication system) using a higher frequency band than the 4G communication system (e.g., the frequency band above 6 GHz) should be considered. The 5G communication system can support enhanced mobile broadband (eMBB) communication, ultra-reliable and low-latency communication (URLLC), massive machine type communication (mMTC), etc.

[0003] 4G communication systems and 5G communication systems can support vehicle-to-everything (V2X) communication. V2X communication supported in cellular communication systems (e.g., 4G communication systems, 5G communication systems, etc.) can be referred to as "cellular-V2X (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), etc.

[0004] In a cellular communication system, V2X communication (e.g., C-V2X communication) can be performed based on a sidelink communication technology (e.g., Proximity-based Service (ProSe) communication technology, Device-to-Device (D2D) communication technology, etc.). For example, a sidelink channel for vehicles participating in V2V communication can be established, and the sidelink channel can be used to perform communication between vehicles. Sidelink communication can be performed using configured grant (CG) resources. CG resources can be periodically configured, and CG resources can be used to transmit periodic data (e.g., periodic sidelink data).

[0005] On the other hand, in the sidelink communication, the terminal may support a discontinuous reception (DRX) operation. In this case, a method for paging a terminal operating in an idle state or an inactive state is required. Summary of the invention

[0006] Technical issues

[0007] An object of the present invention to solve the above-mentioned problems is to provide a method and apparatus for paging in side link communication.

[0008] Technical Solution

[0009] For achieving this purpose, an operating method of a transmitting terminal according to a first exemplary embodiment of the present invention may include: receiving side link (SL) paging configuration information from a base station; receiving paging downlink control information (DCI) in a side link paging opportunity (SPO) indicated by the SL paging configuration information from the base station; and sending an SL paging message to one or more receiving terminals in the side link resources indicated by the paging DCI.

[0010] The SL paging configuration information may further include a sidelink-paging-radio network temporary identifier (SL-P-RNTI), and the paging DCI may be received using the SL-P-RNTI.

[0011] The SL-P-RNTI may be configured for each broadcast type, and the broadcast type may be unicast, multicast, or broadcast.

[0012] The paging DCI may further include an identifier (ID) indicating a broadcast type of the SL paging message, and the ID may be an ID of a transmitting terminal, a group ID, or a broadcast ID.

[0013] The operating method may further include: when the transmission of the SL paging message is completed, performing side link communication with one or more receiving terminals according to a broadcast type related to the SL paging message, wherein the broadcast type may be unicast, groupcast, or broadcast.

[0014] For achieving this purpose, an operating method of a transmitting terminal according to a second exemplary embodiment of the present invention may include: receiving side link (SL) paging configuration information from a base station; sending paging side link control information (SCI) in a side link paging opportunity (SPO) indicated by the SL paging configuration information to one or more receiving terminals; and sending an SL paging message in a side link resource indicated by the paging SCI to one or more receiving terminals.

[0015] The SPO may be configured within a resource pool configured by the base station, and a first bitmap indicating one or more time slots in which the SPO is configured within the resource pool may be included in the SL paging configuration information.

[0016] A second bitmap indicating one or more time slots configuring the resource pool may be received from the base station, and the SPO may be indicated by a combination of the first bitmap and the second bitmap.

[0017] The number of bits included in the first bitmap may be equal to the number of time slots configured as a resource pool within a preconfigured period.

[0018] The number of bits included in the first bitmap may be equal to the number of all time slots belonging to a cycle according to a configuration unit of a resource pool.

[0019] The SPO may be configured outside a resource pool configured by the base station, and a first bitmap indicating one or more time slots in which the SPO is configured outside the resource pool may be included in the SL paging configuration information.

[0020] The SL paging configuration information may further include a sidelink-paging-radio network temporary identifier (SL-P-RNTI), and the paging SCI may be received using the SL-P-RNTI.

[0021] The SL-P-RNTI may be configured for each broadcast type, and the broadcast type may be unicast, multicast, or broadcast.

[0022] The paging SCI may further include an identifier (ID) indicating a broadcast type of the SL paging message, and the ID may be an ID of a transmitting terminal, a group ID, or a broadcast ID.

[0023] The operating method may further include: when the transmission of the SL paging message is completed, performing side link communication with one or more receiving terminals according to a broadcast type related to the SL paging message, wherein the broadcast type may be unicast, groupcast, or broadcast.

[0024] For achieving this purpose, an operating method of a receiving terminal according to a third exemplary embodiment of the present invention may include: receiving side link (SL) paging configuration information from a base station; receiving paging side link control information (SCI) from a transmitting terminal by performing a monitoring operation on a side link paging opportunity (SPO) indicated by the SL paging configuration information; and receiving an SL paging message in the side link resources indicated by the paging SCI from the transmitting terminal.

[0025] The paging SCI and the SL paging message associated with the paging SCI can be received at the same SPO.

[0026] The SPO may be configured within a resource pool configured by the base station, and a first bitmap indicating one or more time slots in which the SPO is configured within the resource pool may be included in the SL paging configuration information.

[0027] The SL paging configuration information may further include a sidelink-paging-radio network temporary identifier (SL-P-RNTI), and the paging SCI may be received using the SL-P-RNTI.

[0028] The paging SCI may further include an identifier (ID) indicating a broadcast type of the SL paging message, and the ID may be an ID of a transmitting terminal, a group ID, or a broadcast ID.

[0029] Beneficial Effects

[0030] According to the present invention, a side link paging opportunity (SPO) can be configured, and configuration information of the SPO can be sent to a terminal. The transmitting terminal can send a side link (SL) paging message to a receiving terminal by using the SPO, and the receiving terminal can receive the SL paging message from the transmitting terminal by performing a monitoring operation on the SPO. Accordingly, the paging operation can be efficiently performed in the side link communication, and the performance of the communication system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0033] Figure 3 is a conceptual diagram illustrating an exemplary embodiment of a communication node constituting a cellular communication system.

[0034] Figure 4 is a block diagram illustrating an exemplary implementation of a user plane protocol stack of a UE performing sidelink communications.

[0035] Figure 5is a block diagram illustrating a first exemplary implementation of a control plane protocol stack of a UE performing sidelink communications.

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

[0037] Figure 7 is a sequence diagram showing a first exemplary embodiment of a paging method for side link communication.

[0038] Figure 8 is a conceptual diagram illustrating a first exemplary embodiment of an SPO configuration method in a communication system.

[0039] Fig. 9 is a conceptual diagram illustrating a first exemplary embodiment of an SPO indication method in a communication system.

[0040] Fig.10 is a conceptual diagram illustrating a second exemplary embodiment of a SPO configuration method in a communication system.

[0041] Fig.11 is a conceptual diagram illustrating a third exemplary embodiment of an SPO configuration method in a communication system.

[0042] Fig.12 is a conceptual diagram illustrating a fourth exemplary embodiment of an SPO configuration method in a communication system.

[0043] Fig.13 is a conceptual diagram illustrating a second exemplary embodiment of an SPO indication method in a communication system.

[0044] Fig.14 is a conceptual diagram illustrating a fifth exemplary embodiment of a SPO configuration method in a communication system.

[0045] Fig.15 is a conceptual diagram illustrating a sixth exemplary embodiment of an SPO configuration method in a communication system.

[0046] Fig.16 is a conceptual diagram illustrating a seventh exemplary embodiment of a SPO configuration method in a communication system.

[0047] Fig.17 is a conceptual diagram illustrating an eighth exemplary embodiment of an SPO configuration method in a communication system.

[0048] Fig.18 is a conceptual diagram illustrating a third exemplary embodiment of an SPO indication method in a communication system.

[0049] Fig.19is a conceptual diagram illustrating a ninth exemplary embodiment of a SPO configuration method in a communication system.

[0050] Fig. 20 is a conceptual diagram illustrating a fourth exemplary embodiment of an SPO indication method in a communication system. DETAILED DESCRIPTION

[0051] Although the present invention is susceptible to various modifications and alternative forms, specific embodiments are shown by way of example in the drawings and described in detail. However, it should be understood that this specification is not intended to limit the present invention to specific embodiments, but rather, the present invention is intended to cover all modifications, equivalents and alternative forms that fall within the spirit and scope of the present invention.

[0052] Although the terms "first", "second", etc. may be used herein with reference to various elements, these elements should not be construed as being limited to these terms. These terms are only used to distinguish one element from another. For example, a first element may be referred to as a second element, and a second element may be referred to as a first element, without departing from the scope of the present invention. The term "and / or" includes any and all combinations of one or more related enumerated items.

[0053] It should be understood that when an element is referred to as being "connected" or "joined" to another element, it can be directly connected or joined to another element, or there can be intervening elements. Conversely, when an element is referred to as being "directly connected" or "directly joined" to another element, there are no intervening elements.

[0054] The terms used in this article are only used for the purpose of describing specific embodiments and are not intended to be used to limit embodiments of the present invention. As used herein, the singular forms "one", "an" and "the" are intended to also include plural forms, unless the context clearly indicates otherwise. It will also be further understood that when the terms "comprise", "comprises", "includes" and / or "includes" are used in this article, it is indicated that there are the features, numerical values, steps, operations, elements, parts and / or combinations thereof, but it is not excluded that there are or add one or more other features, numerical values, steps, operations, elements, parts and / or combinations thereof.

[0055] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as those commonly understood by those of ordinary skill in the art to which the present invention belongs. It will be further understood that terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning of the term in the context of the relevant technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0056] Hereinafter, preferred exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, for ease of overall understanding, in the description throughout the drawings, the same reference numerals refer to the same elements, and repeated description of the same reference numerals will be omitted.

[0057] Figure 1 is a conceptual diagram showing a V2X communication scenario.

[0058] like Figure 1 As shown, V2X communication may include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc. V2X communication may be supported by a cellular communication system (e.g., cellular communication system 140), and V2X communication supported by the cellular communication system 140 may be referred to as "cellular-V2X (C-V2X) communication". Here, the cellular communication system 140 may 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.

[0059] V2V communication may include communication between a first vehicle 100 (e.g., a communication node located in the vehicle 100) and a second vehicle 110 (e.g., a communication node located in the vehicle 110). Various driving information such as speed, heading, time, location, etc. may be exchanged between the vehicle 100 and the vehicle 110 through V2V communication. For example, autonomous driving (e.g., platoon driving) may be supported based on the driving information exchanged through V2V communication. V2V communication supported in the cellular communication system 140 may be performed based on a "sidelink" communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, communication between the vehicle 100 and the vehicle 110 may be performed using at least one sidelink channel established between the vehicle 100 and the vehicle 110.

[0060] V2I communication may include communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and an infrastructure (e.g., a road side unit (RSU)) 120 located on the roadside. The infrastructure 120 may also include a traffic light or a street light located on the roadside. For example, when V2I communication is performed, communication may 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, and the like may be exchanged between the first vehicle 100 and the infrastructure 120 through V2I communication. V2I communication supported in the cellular communication system 140 may also be performed based on a sidelink communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, communication between the vehicle 100 and the infrastructure 120 may be performed using at least one sidelink channel established between the vehicle 100 and the infrastructure 120.

[0061] V2P communication may include communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and the person 130 (e.g., a communication node carried by the person 130). Driving information of the first vehicle 100 and movement information of the person 130, such as speed, forward direction, time, location, etc., may be exchanged between the vehicle 100 and the person 130 through V2P communication. By judging a dangerous situation based on the obtained driving information and movement information, the communication node located in the vehicle 100 or the communication node carried by the person 130 may generate an alarm indicating the danger. V2P communication supported in the cellular communication system 140 may be performed based on a sidelink communication technology (e.g., ProSe and D2D communication technology, etc.). In this case, communication between the communication node located in the vehicle 100 and the communication node carried by the person 130 may be performed using at least one sidelink channel established between the communication nodes.

[0062] V2N communication may be communication between the first vehicle 100 (e.g., a communication node located in the vehicle 100) and a server connected via the cellular communication system 140. V2N communication may be performed based on 4G communication technology (e.g., LTE or LTE-A) or 5G communication technology (e.g., NR). In addition, V2N communication may be performed based on Wireless Access in Vehicular Environments (WAVE) communication technology or Wireless Local Area Network (WLAN) communication technology defined in Institute of Electrical and Electronics Engineers (IEEE) 802.11 or Wireless Personal Area Network (WPAN) communication technology defined in IEEE 802.15.

[0063] On the other hand, the cellular communication system 140 supporting V2X communication may be configured as follows.

[0064] Figure 2 is a conceptual diagram illustrating an exemplary embodiment of a cellular communication system.

[0065] like Figure 2 As shown, the cellular communication system may include an access network, a core network, etc. The access network may include a base station 210, a relay station 220, user equipment (UE) 231 to 236, etc. UE 231 to UE 236 may include a Figure 1 The communication nodes in the vehicle 100 and the vehicle 110 are located Figure 1 The communication nodes in the infrastructure 120 are composed of Figure 1 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, and the like.

[0066] When the cellular communication system supports 5G communication technology, the core network may include a user plane function (UPF) 250, a session management function (SMF) 260, an access and mobility management function (AMF) 270, etc. Alternatively, when the cellular communication system operates in a non-standalone (NSA) mode, the core network composed of the S-GW 250, the P-GW 260, and the MME 270 may support 5G communication technology as well as 4G communication technology, and the core network composed of the UPF 250, the SMF 260, and the AMF 270 may support 4G communication technology as well as 5G communication technology.

[0067] In addition, when the cellular communication system supports network slicing technology, the core network can be divided into multiple logical network slices. For example, network slices supporting V2X communication (e.g., V2V network slices, V2I network slices, V2P network slices, V2N network slices, etc.) can be configured, and V2X communication can be supported by V2X network slices configured in the core network.

[0068] The communication nodes (e.g., base stations, relay stations, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) comprising a cellular communication system can perform communication by utilizing at least one communication technology selected from code division multiple access (CDMA) technology, time division multiple access (TDMA) technology, frequency division multiple access (FDMA) technology, orthogonal frequency division multiplexing (OFDM) technology, filtered OFDM technology, orthogonal frequency division multiple access (OFDMA) technology, single carrier FDMA (SC-FDMA) technology, non-orthogonal multiple access (NOMA) technology, generalized frequency division multiplexing (GFDM) technology, filter bank multi-carrier (FBMC) technology, universal filtered multi-carrier (UFMC) technology, and space division multiple access (SDMA) technology.

[0069] The communication nodes comprising a cellular communication system (e.g., base stations, relay stations, UE, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) may be configured as follows.

[0070] Figure 3 is a conceptual diagram illustrating an exemplary embodiment of a communication node constituting a cellular communication system.

[0071] like Figure 3As 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. In addition, 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 through a bus 370.

[0072] However, each component included in the communication node 300 may be connected to the processor 310 via a separate interface or a separate bus instead of the common bus 370. For example, the processor 310 may be connected to at least one of the memory 320, the transceiver 330, the input interface device 340, the output interface device 350, and the storage device 360 ​​via a dedicated interface.

[0073] The processor 310 may execute at least one instruction stored in at least one of the memory 320 and the storage device 360. The processor 310 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which a method according to an embodiment of the present invention is executed. Each of the memory 320 and the storage device 360 ​​may include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 320 may include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0074] Reference again Figure 2 In the communication system, the base station 210 may form a macro cell or a small cell and may be connected to the core network via an ideal backhaul or a non-ideal backhaul. The base station 210 may send a signal received from the core network to UE 231 to UE 236 and the relay station 220, and may send a signal received from UE 231 to UE 236 and the relay station 220 to the core network. UE#1 231, UE#2 232, UE#4 234, UE#5 235, and UE#6 236 may belong to the cell coverage of the base station 210. UE#1 231, UE#2 232, UE#4 234, UE#5 235, and UE#6 236 may be connected to the base station 210 by performing a connection establishment procedure with the base station 210. UE#1 231 , UE#2 232 , UE#4 234 , UE#5 235 , and UE#6 236 may communicate with the base station 210 after being connected to the base station 210 .

[0075] The relay station 220 may be connected to the base station 210, and may relay communication between the base station 210 and UE#3 233 and UE#4 234. That is, the relay station 220 may transmit a signal received from the base station 210 to the UE#3 233 and UE#4 234, and may transmit a signal received from the UE#3 233 and UE#4 234 to the base station 210. The UE#4 234 may belong to both the cell coverage of the base station 210 and the cell coverage of the relay station 220, and the UE#3 233 may belong to the cell coverage of the relay station 220. That is, the UE#3 233 may be located outside the cell coverage of the base station 210. The UE#3 233 and UE#4 234 may be connected to the relay station 220 by performing a connection establishment procedure with the relay station 220. The UE#3 233 and UE#4 234 may communicate with the relay station 220 after being connected to the relay station 220.

[0076] The base station 210 and the relay station 220 may support multiple-input multiple-output (MIMO) technology (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multi-point (CoMP) communication technology, carrier aggregation (CA) communication technology, unlicensed band communication technology (e.g., licensed assisted access (LAA), enhanced LAA (eLAA), etc.), side link communication technology (e.g., ProSe communication technology, D2D communication technology), etc. UE#1 231, UE#2 232, UE#5 235, and UE#6 236 may perform operations corresponding to the base station 210 and operations supported by the base station 210. UE#3 233 and UE#4 234 may perform operations corresponding to the relay station 220 and operations supported by the relay station 220.

[0077] Here, the base station 210 may refer to a Node B (NB), an evolved Node B (eNB), a base transceiver station (BTS), a radio remote head (RRH), a transmission reception point (TRP), a radio unit (RU), a road side unit (RSU), a radio transceiver, an access point, an access node, etc. The relay station 220 may refer to a small base station or a relay node, etc. Each of UE#1 231 to UE#6 236 may refer to a terminal, an access terminal, a mobile terminal, a station, a user station, a mobile station, a portable user station, a node, a device, an on-broad unit (OBU), etc.

[0078] On the other hand, the communication between UE#5 235 and UE#6 236 may be performed based on the sidelink communication technology. The sidelink communication may be performed based on a one-to-one scheme or a one-to-many scheme. When performing V2V communication using the sidelink communication technology, UE#5 235 may be located at Figure 1 The communication node in the first vehicle 100, and UE#6 236 may be located at Figure 1 When V2I communication is performed using the sidelink communication technology, UE#5 235 may be a communication node located in the second vehicle 110. Figure 1 The communication node in the first vehicle 100, and UE#6 236 may be located at Figure 1 When performing V2P communication using the sidelink communication technology, UE#5 235 may be a communication node located in Figure 1 The communication node in the first vehicle 100, and UE#6 236 may be composed of Figure 1 The person 130 carries the communication node.

[0079] The scenarios in which the side link communication is applied can be classified according to the locations of the UEs (e.g., UE#5 235 and UE#6 236) participating in the side link communication as shown in Table 1 below. For example, Figure 2 The scenario of side link communication between UE#5 235 and UE#6 236 shown in the figure can be side link communication scenario C.

[0080] [Table 1]

[0081]

[0082] On the other hand, the user plane protocol stack of the UEs (eg, UE#5 235 and UE#6 236) performing sidelink communication may be configured as follows.

[0083] Figure 4 is a block diagram illustrating an exemplary implementation of a user plane protocol stack of a UE performing sidelink communications.

[0084] like Figure 4 As shown, the UE on the left can be Figure 2 UE#5 235 shown in FIG. 1 , and the right UE may be Figure 2 UE#6 236 shown in . The scenario of the side link communication between UE#5 235 and UE#6 236 can be one of the side link communication scenarios #A to scenario #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.

[0085] A sidelink communication between UE#5 235 and UE#6 236 may be performed using a PC5 interface (e.g., a PC5-U interface). A layer 2 identifier (ID) (e.g., a source layer 2 ID, a destination layer 2 ID) may be used for sidelink communication, and the layer 2 ID may be an ID configured for V2X communication (e.g., a V2X service). In addition, in the sidelink communication, a hybrid automatic repeat request (HARQ) feedback operation may be supported, and an RLC acknowledged mode (RLC AM) or an RLC unacknowledged mode (RLC UM) may be supported.

[0086] On the other hand, the control plane protocol stack of the UEs (eg, UE#5 235 and UE#6 236) performing sidelink communication may be configured as follows.

[0087] Figure 5 is a block diagram illustrating a first exemplary embodiment of a control plane protocol stack of a UE performing sidelink communications, Figure 6 is a block diagram illustrating a second exemplary embodiment of a control plane protocol stack of a UE performing sidelink communications.

[0088] like Figure 5 and Figure 6 As shown, the UE on the left can be Figure 2 UE#5 235 shown in FIG. 1 , and the right UE may be Figure 2 UE#6 236 is shown. The scenario of the side link communication between UE#5 235 and UE#6 236 can be one of the side link communication scenarios #A to #D in Table 1. Figure 5 The control plane protocol stack shown may be a control plane protocol stack for sending and receiving broadcast information (eg, Physical Sidelink Broadcast Channel (PSBCH)).

[0089] 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. A sidelink communication between UE#5 235 and UE#6 236 may be performed using a PC5 interface (eg, PC5-C interface). Figure 6 The control plane protocol stack shown may be a control plane protocol stack for one-to-one sidelink communications. Figure 6 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, a PDCP layer, and a PC5 signaling protocol layer.

[0090] On the other hand, channels used in the sidelink communication between UE#5 235 and UE#6 236 may include a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), a physical sidelink discovery channel (PSDCH), and a physical sidelink broadcast channel (PSBCH). PSSCH may be used to transmit and receive sidelink data and may be configured in a UE (e.g., UE#5 235 or UE#6 236) through higher layer signaling. PSCCH may be used to transmit and receive sidelink control information (SCI) and may also be configured in a UE (e.g., UE#5 235 or UE#6 236) through higher layer signaling.

[0091] PSDCH can be used for the discovery process. For example, a discovery signal can be transmitted via PSDCH. PSBCH can be used to send and receive broadcast information (e.g., system information). In addition, a demodulation reference signal (DM-RS), a synchronization signal, etc. can be used in the sidelink communication between UE#5 235 and UE#6 236. The synchronization signal may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS).

[0092] On the other hand, the sidelink transmission mode (TM) can be classified into sidelink TM#1 to TM#4 as shown in Table 2 below.

[0093] [Table 2]

[0094] SidelinkTM illustrate #1 Transmission using resources scheduled by the base station #2 UE automatic transmission without base station scheduling #3 Transmission using resources scheduled by a base station in V2X communications #4 UE automatic transmission without base station scheduling in V2X communication

[0095] When sidelink TM#3 or TM#4 is supported, each of UE#5 235 and UE#6 236 may perform sidelink communication using a resource pool configured by base station 210. A resource pool may be configured for each of sidelink control information and sidelink data.

[0096] A resource pool for side link control information may be configured based on an RRC signaling process (e.g., a dedicated RRC signaling process, a broadcast RRC signaling process). A resource pool for receiving side link control information may be configured by a broadcast RRC signaling process. When side link TM#3 is supported, a resource pool for transmitting side link control information may be configured by a dedicated RRC signaling process. In this case, the side link control information may be transmitted by resources scheduled by the base station 210 within the resource pool configured by the dedicated RRC signaling process. When side link TM#4 is supported, a resource pool for transmitting side link control information may be configured by a dedicated RRC signaling process or a broadcast RRC signaling process. In this case, the side link control information may be sent by resources automatically selected by a UE (e.g., UE#5 235 or UE#6 236) within the resource pool configured by the dedicated RRC signaling process or the broadcast RRC signaling process.

[0097] When side link TM#3 is supported, a resource pool for sending and receiving side link data may not be configured. In this case, the side link data may be sent and received through resources scheduled by the base station 210. When side link TM#4 is supported, a resource pool for sending and receiving side link data may be configured through a dedicated RRC signaling process or a broadcast RRC signaling process. In this case, the side link data may be sent and received through resources automatically selected by a UE (e.g., UE#5 235 or UE#6 236) within a resource pool configured by a dedicated RRC signaling process or a broadcast RRC signaling process.

[0098] Then, the retransmission method of the sidelink data will be described. In an exemplary embodiment, the HARQ response may be referred to as a HARQ-acknowledgement signal (ACK). The HARQ response may be an ACK or a negative 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.

[0099] Even when describing a method to be performed at a first communication node in a communication node (e.g., transmission or reception of a signal), the corresponding second communication node may also perform a method corresponding to the method performed at the first communication node (e.g., reception or transmission of a signal). That is, when describing the operation of UE#1 (e.g., vehicle #1), the corresponding UE#2 (e.g., vehicle #2) may perform an operation corresponding to the operation of UE#1. Conversely, when describing the operation of UE#2, the corresponding UE#1 may perform an operation corresponding to the operation of UE#2. In the exemplary embodiment described below, the operation of the vehicle may be the operation of a communication node located in the vehicle.

[0100] In an exemplary embodiment, signaling may be a combination of one or two or more of higher layer signaling, MAC signaling, and physical (PHY) signaling. Messages for higher layer signaling may be referred to as "higher layer messages" or "higher layer signaling messages". Messages for MAC signaling may be referred to as "MAC messages" or "MAC signaling messages". Messages for PHY signaling may be referred to as "PHY messages" or "PHY signaling messages". Higher layer signaling may 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 may refer to the operation of sending and receiving MAC control elements (CE). PHY signaling may refer to the operation of sending and receiving control information (e.g., downlink control information (DCI), uplink control information (UCI) or SCI).

[0101] The sidelink signal may be a synchronization signal and a reference signal for sidelink communication. For example, the synchronization signal may be a synchronization signal / physical broadcast channel (synchronization signal, SS / physical broadcast channel, PBCH) block, a sidelink synchronization signal (sidelink synchronization signal, SLSS), a primary sidelink synchronization signal (primary sidelink synchronization signal, PSSS), a secondary sidelink synchronization signal (secondary sidelink synchronization signal, SSSS), etc. The reference signal may be a channel state information reference signal (channel state information-reference signal, CSI-RS), DM-RS, phase tracking-reference signal (phase tracking-reference signal, PT-RS), cell specific reference signal (cell specific reference signal, CRS), sounding reference signal (sounding reference signal, SRS), discovery reference signal (discovery reference signal, DRS), etc.

[0102] The sidelink channel may be a PSSCH, a PSCCH, a PSDCH, a PSBCH, a physical sidelink feedback channel (PSFCH), etc. In addition, a sidelink channel may refer to a sidelink channel including a sidelink signal mapped to a specific resource in a corresponding sidelink channel. Sidelink communications may support broadcast services, multicast services, groupcast services, and unicast services.

[0103] Sidelink communication can be performed based on a single SCI scheme or a multiple SCI scheme. When a single SCI scheme is used, data transmission (e.g., sidelink data transmission, sidelink shared channel (SL-SCH) transmission) can be performed based on one SCI (e.g., first-phase SCI). When a multiple SCI scheme is used, data transmission can be performed using two SCIs (e.g., first-phase SCI and second-phase SCI). SCI can be transmitted on PSCCH and / or PSSCH. When a single SCI scheme is used, SCI (e.g., first-phase SCI) can be transmitted on PSCCH. When a multiple SCI scheme is used, the first-phase SCI can be transmitted on PSCCH, and the second-phase SCI can be transmitted on PSCCH or PSSCH. The first-phase SCI can be referred to as "first-phase SCI", and the second-phase SCI can be referred to as "second-phase SCI". The first-phase SCI format may include SCI format 1-A, and the second-phase SCI format may include SCI format 2-A, SCI format 2-B, and SCI format 2-C.

[0104] The first stage SCI may include one or more information elements of priority information, frequency resource allocation information, time resource allocation information, resource reservation period information, demodulation reference signal (DMRS) mode information, second stage SCI format information, beta_offset indicator, number of DMRS ports, and modulation and coding scheme (MCS) information. The second stage SCI may include one or more information elements of HARQ processor identifier (ID), redundancy version (RV), source ID, destination ID, CSI request information, regional ID, and communication range requirement.

[0105] On the other hand, in sidelink communication (e.g., V2X communication), the terminal may perform discontinuous reception (DRX) operation to save power. For example, the terminal may operate in an RRC idle state or an RRC inactive state to save power. In this case, the transmitting terminal may send a paging message to a receiving terminal operating in an RRC idle state or an RRC inactive state for RRC reconfiguration operations (e.g., RRC request, RRC connection recovery), operations to update system information, and / or public safety notification operations (e.g., public warning system (PWS), earthquake and tsunami warning system (ETWS), etc.).

[0106] In an exemplary embodiment, the transmission of a paging message may include transmission from a base station to a transmitting terminal, transmission from a transmitting terminal to a receiving terminal, and transmission from a base station to a receiving terminal. In a unicast-based side link communication, a paging message may be sent to one receiving terminal. In a multicast, groupcast, or broadcast-based side link communication, a paging message may be sent to one or more receiving terminals. Here, the transmitting terminal may be a terminal that transmits side link (SL) data in a side link communication, and the receiving terminal may be a terminal that receives SL data in a side link communication.

[0107] Figure 7 is a sequence diagram showing a first exemplary embodiment of a paging method for side link communication.

[0108] like Figure 7 As shown, the communication system may include a base station, a transmitting terminal, and a receiving terminal. The base station may be Figure 2 The base station 210 shown, the transmitting terminal may be Figure 2 UE 235 shown in FIG. 1 , and the receiving terminal may be Figure 2 UE 236 shown. Each of the base station, the transmitting terminal and the receiving terminal can be configured to communicate with Figure 3 The communication node 300 shown is the same or similar. The sending terminal and the receiving terminal may support Figures 4 to 6 The protocol stack shown.

[0109] The base station may generate SL paging configuration information. The SL paging configuration information may include configuration information of a sidelink paging occasion (SPO) and / or a sidelink-paging-radio network temporary identifier (SL-P-RNTI). SPO may be a resource capable of transmitting paging DCI, paging SCI and / or SL paging messages. The configuration information of SPO may indicate a resource pool, resources within a resource pool, or resources outside a resource pool. SPO may be indicated by a bitmap (e.g., an SPO bitmap). In addition, the base station may transmit configuration information of the resource pool. The transmission operation of the configuration information of the resource pool may be performed before step S710 or in step S710. The resource pool may be indicated by a bitmap (e.g., a resource bitmap). In this case, SPO may be indicated by a combination of a resource bitmap and an SPO bitmap.

[0110] Paging DCI may refer to DCI including paging information (e.g., DCI format 3_0, DCI format 3-x). Here, x may be a natural number. The cyclic redundancy check (CRC) of the paging DCI may be scrambled by the SL-P-RNTI. Paging SCI may refer to SCI including paging information (e.g., SCI format 1, SCI format 2). The CRC of the paging SCI may be scrambled by the SL-P-RNTI.

[0111] The paging information included in each of the paging DCI and the paging SCI may include: a short message indicator, a short message, frequency domain resource allocation information, time domain resource allocation information, virtual resource block (VRB) to physical resource block (PRB) mapping information, MCS information, transport block (TB) scaling information, ID of the transmitting terminal, group ID, broadcast ID and / or broadcast type information. The broadcast type information may indicate unicast, multicast, groupcast or broadcast. For example, the broadcast type information may indicate that the SL paging message associated with each of the paging DCI and the paging SCI is a SL paging message for unicast transmission, multicast transmission, groupcast transmission or broadcast transmission.

[0112] SL-P-RNTI can be used for the transmission of paging DCI and paging SCI. SL-P-RNTI can be configured for each transmission type. For example, SL-P-RNTI for unicast transmission, SL-P-RNTI for multicast transmission, SL-P-RNTI for groupcast transmission, and SL-P-RNTI for broadcast transmission can be configured.

[0113] The base station may send SL paging configuration information to the terminal (e.g., a transmitting terminal and a receiving terminal) (S710). The SL paging configuration information may be transmitted through a combination of one or two or more of higher layer signaling (e.g., system information, RRC message), MAC signaling, and PHY signaling. Each of the transmitting terminal and the receiving terminal may receive the SL paging configuration information from the base station and identify the information elements (e.g., SPO configuration information, SL-P-RNTI) included in the SL paging configuration information.

[0114] The SL paging operation can be performed based on method 1, method 2 or method 3.

[0115] [Method 1]

[0116] When paging a terminal is required, the base station may send a paging DCI to a terminal (e.g., a transmitting terminal and / or a receiving terminal) (S720). Here, the terminal may operate in an RRC idle state or an RRC inactive state. The paging DCI may be transmitted in an SPO indicated by the SL paging configuration information. The paging DCI may be sent only to the transmitting terminal. Alternatively, the paging DCI may be sent to a transmitting terminal and a receiving terminal. The transmitting terminal and / or the receiving terminal may receive the paging DCI by performing a monitoring operation on the SPO indicated by the SL paging configuration information. The receiving operation of the paging DCI may be performed using the SL-P-RNTI. The transmitting terminal and / or the receiving terminal may identify the information elements included in the paging DCI.

[0117] The transmitting terminal may send a SL paging message to the receiving terminal (S721). The SL paging message may be transmitted using the resources indicated by the paging DCI. The resources indicated by the paging DCI may belong to the SPO configured by the SL paging configuration information. The receiving terminal may receive the SL paging message from the transmitting terminal. When the SL paging message is received at the receiving terminal, a side link communication between the transmitting terminal and the receiving terminal may be performed. Here, the side link communication may be a side link communication based on unicast, multicast, groupcast or broadcast.

[0118] [Method 2]

[0119] When paging a terminal is required, the base station may send a paging DCI to a terminal (e.g., a transmitting terminal and / or a receiving terminal) (S730). Here, the terminal may operate in an RRC idle state or an RRC inactive state. The paging DCI may be transmitted in an SPO indicated by the SL paging configuration information. The transmitting terminal and / or the receiving terminal may receive the paging DCI by performing a monitoring operation on the SPO indicated by the SL paging configuration information. The receiving operation of the paging DCI may be performed using the SL-P-RNTI. The transmitting terminal and / or the receiving terminal may identify the information elements included in the paging DCI.

[0120] The base station may send a SL paging message to a transmitting terminal and / or a receiving terminal (S731). The SL paging message may be transmitted using the resources indicated by the paging DCI. The resources indicated by the paging DCI may belong to the SPO configured by the SL paging configuration information. The transmitting terminal and / or the receiving terminal may receive the SL paging message from the base station. When the SL paging message is received at the transmitting terminal and / or the receiving terminal, a side link communication between the transmitting terminal and the receiving terminal may be performed. Here, the side link communication may be a side link communication based on unicast, multicast, groupcast or broadcast.

[0121] [Method 3]

[0122] When paging the receiving terminal is required, the transmitting terminal may send a paging SCI to the receiving terminal (S740). Here, the receiving terminal may operate in an RRC idle state or an RRC inactive state. The paging SCI may be transmitted in an SPO indicated by the SL paging configuration information. The receiving terminal may receive the paging SCI by performing a monitoring operation on the SPO indicated by the SL paging configuration information. The receiving operation of the paging SCI may be performed using the SL-P-RNTI. The receiving terminal may identify the information elements included in the paging SCI.

[0123] The sending terminal may send a SL paging message to the receiving terminal (S741). The SL paging message may be transmitted using the resources indicated by the paging SCI. The resources indicated by the paging SCI may belong to the SPO configured by the SL paging configuration information. The paging SCI and the SL paging message related to the paging SCI may be transmitted in the same SPO (e.g., the same time slot). The sending terminal and / or the receiving terminal may receive the SL paging message from the base station. When the SL paging message is received at the receiving terminal, side link communication between the sending terminal and the receiving terminal may be performed. Here, the side link communication may be a side link communication based on unicast, multicast, groupcast or broadcast.

[0124] Hereinafter, a method for configuring SPO will be described. Information elements for configuring SPO may be transmitted at step S710. SPO may be referred to as a "paging transmission period" or a "paging transmission area".

[0125] [SPO configuration method based on resource pool]

[0126] In sidelink communication, a resource pool may be configured (or preconfigured) based on a bitmap. A resource pool may be configured with a specific periodicity. The unit of a resource pool configured by a bitmap may be a plurality of time slots. Here, the number of the plurality of time slots (i.e., the unit of the resource pool) may be the number of time slots included in a radio frame. Alternatively, the unit of the resource pool may be less than or greater than the number of time slots included in a radio frame. The number of time slots included in a radio frame may vary according to system parameters (e.g., subcarrier spacing, etc.).

[0127] In an exemplary embodiment, one bitmap may be used to configure a resource pool for each of 10 time slots. In this case, the size of the bitmap may be 10 bits, and each bit may indicate whether a time slot is configured as a resource pool. The application periodicity of the bitmap may be preset. When the application periodicity of the bitmap is two radio frames, the bitmap may be applied to radio frames #n, #n+2, #n+4, #n+6, etc. n may be an integer greater than or equal to 0.

[0128] The resource pool may be divided into a Tx resource pool and an Rx resource pool. The Tx resource pool may be a resource pool for side link transmission, and the Rx resource pool may be a resource pool for side link reception. The Tx resource pool and the Rx resource pool may be configured identically. When the configuration of the Tx resource pool is different from the configuration of the Rx resource pool, the resource pool may be interpreted as a Tx resource pool, an Rx resource pool, or an abnormal resource pool according to the sending or receiving entity of the SL paging message.

[0129] When the SL paging message is transmitted from the base station to the sending terminal, the resource pool (e.g., the resource pool and / or SPO for transmitting the SL paging message) may be a Tx resource pool or an Rx resource pool configured in the sending terminal. When the SL paging message is transmitted from the sending terminal to the receiving terminal, the resource pool (e.g., the resource pool and / or SPO for transmitting the SL paging message) may be an Rx resource pool configured in the receiving terminal. When the SL paging message is transmitted from the base station to the receiving terminal, the resource pool (e.g., the resource pool and / or SPO for transmitting the SL paging message) may be an Rx resource pool configured in the receiving terminal. When the Tx / Rx resource pool configurations of the sending terminal and the receiving terminal are the same, the resource pool (e.g., SPO) used to transmit the SL paging message may be an abnormal resource pool.

[0130] 1. How to configure a specific resource area in a resource pool as an SPO

[0131] Figure 8 is a conceptual diagram illustrating a first exemplary embodiment of an SPO configuration method in a communication system.

[0132] like Figure 8 As shown, the bitmap may indicate whether a resource pool is configured in each of the 10 time slots. The bitmap for configuring a resource pool may be referred to as a "resource bitmap". The 10 time slots configured by the resource bitmap may be continuous time slots or non-continuous time slots. Non-continuous time slots may be time slots that do not include time slots reserved for transmitting signals and / or channels between continuous time slots. A bit set to a first value (e.g., 0) in the resource bitmap may indicate that a resource pool is not configured in the time slot mapped to the bit (e.g., the time slot does not belong to the resource pool), and a bit set to a second value (e.g., 1) in the resource bitmap may indicate that a resource pool is configured in the time slot mapped to the bit (e.g., the time slot belongs to the resource pool). Each bit included in the resource bitmap may be mapped to one time slot or multiple time slots. The resource bitmap may be applied based on a preset periodicity. When the preset periodicity is two radio frames, the resource bitmap may be applied to every two radio frames. The preset periodicity for the resource bitmap may be indicated through one or a combination of two or more of higher layer signaling, MAC signaling, and PHY signaling.

[0133] The resource bitmap may be set to [1 0 0 1 1 1 0 0 1 1] and may be applied to radio frames #1, #3, #5, #7, etc. That is, since the same resource bitmap is applied to every two radio frames, the resource pool may be configured identically for every two radio frames. The SPO slot may be a slot in which paging DCI, paging SCI, and / or SL paging messages may be transmitted. The configuration periodicity of the SPO (e.g., the SPO slot) may be the same as the configuration periodicity of the resource pool.

[0134] Fig. 9 is a conceptual diagram illustrating a first exemplary embodiment of an SPO indication method in a communication system.

[0135] like Fig. 9 As shown, the bitmap may indicate whether SPO is configured in each of the time slots. The bitmap for configuring SPO may be referred to as an "SPO bitmap". The SPO bitmap may be configured based on Scheme 1 or Scheme 2. When Scheme 1 is used, the number of bits included in the SPO bitmap may be the same as the number of bits included in the resource bitmap. That is, the configuration unit of the SPO bitmap may be the same as the configuration unit of the resource bitmap. In this case, the SPO bitmap may indicate whether SPO is configured in each of all time slots (e.g., 10 time slots) associated with the resource bitmap. According to Scheme 1, the SPO bitmap may be set to [0 0 0 0 0 00 0 1 1].

[0136] When scheme 2 is used, the SPO bitmap may indicate whether each of the time slots (e.g., 6 time slots) in which the resource pool is configured in all time slots (e.g., 10 time slots) associated with the resource bitmap is configured with SPO. The time slots in which the resource pool is configured may be indicated by the resource bitmap. According to scheme 2, the SPO bitmap may be set to [0 0 0 0 1 1]. A bit set to a first value (e.g., 0) in the SPO bitmap may indicate that SPO is not configured in the time slot mapped to the bit, and a bit set to a second value (e.g., 1) in the SPO bitmap may indicate that SPO is configured in the time slot mapped to the bit. Each bit included in the SPO bitmap may be mapped to one time slot or multiple time slots.

[0137] The configuration periodicity of SPO may be the same as the configuration periodicity of the resource pool. Alternatively, the configuration periodicity of SPO may be different from the configuration periodicity of the resource pool. The configuration periodicity of SPO may be indicated by a combination of one or two or more of higher layer signaling, MAC signaling, and PHY signaling. SPO may be configured by a function instead of an SPO bitmap. The variables in the function for configuring SPO may include: a system frame index, a radio frame index, resource pool configuration information (e.g., a resource bitmap), an identifier of the receiving terminal (e.g., an ID), an ID of the transmitting terminal, a group ID, a cell ID, a transmission periodicity of the SL paging message (e.g., the configuration periodicity of SPO), and / or new variables configured by higher layer signaling.

[0138] The radio frames capable of transmitting paging control information (e.g., DCI, SCI) and / or SL paging messages may be indicated by functions based on various variables, and the time slots capable of transmitting paging control information and / or SL paging messages within the radio frames may be indicated by an SPO bitmap. Alternatively, all radio frames and time slots capable of transmitting paging control information and / or SL paging messages may be indicated by a function. Alternatively, the radio frames capable of transmitting paging control information and / or SL paging messages may be indicated by a bitmap, and the time slots capable of transmitting paging control information and / or SL paging messages within the radio frames may be indicated by a function.

[0139] Fig.10 is a conceptual diagram illustrating a second exemplary embodiment of a SPO configuration method in a communication system.

[0140] like Fig.10 As shown, the configuration periodicity of SPO (e.g., SPO time slot) may be different from the configuration periodicity of the resource pool. SPO may be configured every 4 radio frames, and the resource pool may be configured every 2 radio frames. The periodicity of SPO may be set in units of radio frames or n time slots. Here, n may be a natural number. A bitmap (e.g., a resource bitmap and / or an SPO bitmap) may be set in units of n time slots. The unit of n time slots may be configured to be the same as the configuration unit of the resource pool. Alternatively, the unit of n time slots may be configured to be different from the configuration unit of the resource pool.

[0141] Fig.11 is a conceptual diagram illustrating a third exemplary embodiment of an SPO configuration method in a communication system.

[0142] like Fig.11As shown, SPO (e.g., SPO time slot) can be configured non-continuously. That is, SPO can be distributed in time slots. The receiving terminal can wake up periodically to obtain the SL paging message and attempt to decode the SL paging message. In order to support this operation, the receiving terminal can periodically obtain a synchronization signal and can maintain synchronization based on the synchronization signal. Therefore, the SPO time slot can be configured considering the transmission periodicity of the synchronization signal. For example, the time slot after the transmission period of the transmission synchronization signal (e.g., the time slot in which the synchronization signal is transmitted) can be configured as the SPO time slot. SPO (e.g., SPO time slot) can be relatively configured based on the transmission period of the synchronization signal in the resource pool.

[0143] When Fig.10 and Fig.11 When using Scheme 1 in the exemplary embodiment shown, the SPO bitmap may include 10 bits. That is, the size of the SPO bitmap may be the same as the size of the resource bitmap. Fig.10 and Fig.11 When using scheme 2 in the exemplary embodiment shown, the SPO bitmap may include 6 bits. That is, the SPO bitmap may indicate whether SPO is configured in each of the 6 time slots configured as a resource pool by the resource bitmap. The configuration periodicity of SPO may be the same as the configuration periodicity of the resource pool. Alternatively, the configuration periodicity of SPO may be configured to be different from the configuration periodicity of the resource pool.

[0144] Periodic information (e.g., SPO and / or resource pool configuration periodic information) may be transmitted using a combination of one or two or more of higher layer signaling, MAC signaling, and PHY signaling. SPO may be configured by a function rather than an SPO bitmap. Alternatively, based on resources (e.g., time slots) reserved for transmission of a sidelink-synchronization signal block (S-SSB), SPO may be configured as m time slots starting from the kth time slot or time slots from the kth time slot to the pth time slot. Information indicating the time slots for configuring SPO (e.g., k, m, and / or p) may be transmitted using a combination of one or two or more of higher layer signaling, MAC signaling, and PHY signaling. Here, each of k, m, and p may be a natural number.

[0145] The reference of the resources reserved for S-SSB transmission may be the first time slot or the last time slot in the time slot in which the S-SSB is transmitted. Alternatively, the reference of the resources reserved for S-SSB transmission may be the first time slot or the last time slot in the time slot in which the side link-primary synchronization signal (e.g., PSSS), the side link-secondary synchronization signal (e.g., SSSS), or the PSBCH constituting the S-SSB is transmitted. The reference of the resources reserved for S-SSB transmission may be explained as follows.

[0146] - The SPO may be configured based on the absolute resource location of the time slot in which the S-SSB is transmitted. In this case, the SPO may be indicated based on the absolute location of the physical resource, rather than a relative reference to a time slot configured as a resource pool.

[0147] -The SPO may be configured according to a time slot belonging to a resource pool based on the location of a resource for transmitting the S-SSB. In this case, after the S-SSB is transmitted, the SPO may be configured based on a time slot belonging to the resource pool. For example, when there are time slots belonging to the resource pool starting from the fourth time slot after the transmission of the S-SSB, the first time slot after the transmission resource of the S-SSB may refer to the first time slot in the resource pool after the transmission time of the S-SSB, and based on the absolute location of the resource, the first time slot after the transmission resource of the S-SSB may be the fourth time slot after the transmission of the S-SSB.

[0148] SPO can be configured based on a function. The variables in the function for configuring SPO can be a system frame index, a radio frame index, resource pool configuration information (e.g., a resource bitmap), an identifier of the receiving terminal (e.g., an ID), an identifier of the transmitting terminal, a group ID, a cell ID, a transmission periodicity of the SL paging message (e.g., SPO configuration periodicity), variables related to the transmission resource configuration of the synchronization signal, and / or new variables configured by higher layer signaling.

[0149] The radio frames capable of transmitting paging control information (e.g., DCI, SCI) and / or SL paging messages may be indicated by functions based on various variables, and the time slots capable of transmitting paging control information and / or SL paging messages within the radio frames may be indicated by an SPO bitmap. Alternatively, all radio frames and time slots capable of transmitting paging control information and / or SL paging messages may be indicated by a function. Alternatively, the radio frames capable of transmitting paging control information and / or SL paging messages may be indicated by a bitmap, and the time slots capable of transmitting paging control information and / or SL paging messages within the radio frames may be indicated by a function.

[0150] 2. Method for configuring a specific resource area outside the resource pool as an SPO

[0151] Fig.12 is a conceptual diagram illustrating a fourth exemplary embodiment of an SPO configuration method in a communication system.

[0152] like Fig.12As shown, SPO can be configured in a time slot that does not belong to a resource pool. The resource bitmap can indicate whether a resource pool is configured in each of the 10 time slots. The 10 time slots configured by the resource bitmap can be continuous time slots or non-continuous time slots. Non-continuous time slots can be time slots that do not include time slots reserved for transmitting signals and / or channels between continuous time slots. A bit set to a first value (e.g., 0) in the resource bitmap can indicate that a resource pool is not configured in the time slot mapped to the bit (e.g., the time slot does not belong to the resource pool), and a bit set to a second value (e.g., 1) in the resource bitmap can indicate that a resource pool is configured in the time slot mapped to the bit (e.g., the time slot belongs to the resource pool). Each bit included in the resource bitmap can be mapped to one time slot or multiple time slots. The resource bitmap can be applied based on a preset periodicity. When the preset periodicity is two radio frames, the resource bitmap can be applied to every two radio frames. The preset periodicity for the resource bitmap may be indicated through one or a combination of two or more of higher layer signaling, MAC signaling, and PHY signaling.

[0153] The resource bitmap can be set to [1 0 0 1 1 1 0 0 1 1] and can be applied to radio frames #1, #3, #5, #7, etc. That is, since the same resource bitmap can be applied to every two radio frames, the resource pool can be configured identically for every two radio frames. The SPO time slot can be a time slot that can transmit paging DCI, paging SCI and / or SL paging messages. SPO (e.g., SPO time slot) can be configured in a time slot that is not configured as a resource pool. The configuration periodicity of SPO (e.g., SPO time slot) can be the same as the configuration periodicity of the resource pool.

[0154] Fig.13 is a conceptual diagram illustrating a second exemplary embodiment of an SPO indication method in a communication system.

[0155] like Fig.13 As shown, the SPO bitmap may indicate whether SPO is configured in each of the time slots. The SPO bitmap may be configured based on Scheme 1 or Scheme 2. When Scheme 1 is used, the number of bits included in the SPO bitmap may be the same as the number of bits included in the resource bitmap. That is, the configuration unit of the SPO bitmap may be the same as the configuration unit of the resource bitmap. In this case, the SPO bitmap may indicate whether SPO is configured in each of all time slots (e.g., 10 time slots) associated with the resource bitmap. According to Scheme 1, the SPO bitmap may be set to [0 0 0 0 0 0 1 1 0 0].

[0156] When scheme 2 is used, it can be indicated whether each of the time slots (e.g., 4 time slots) in which the resource pool is not configured in all time slots associated with the resource bitmap (e.g., 10 time slots) is configured with SPO. The time slots in which the resource pool is not configured can be indicated by the resource bitmap. According to scheme 2, the SPO bitmap can be set to [0 0 1 1]. The bit set to the first value (e.g., 0) in the SPO bitmap can indicate that SPO is not configured in the time slot mapped to the bit, and the bit set to the second value (e.g., 1) in the SPO bitmap can indicate that SPO is configured in the time slot mapped to the bit. Each bit included in the SPO bitmap can be mapped to one time slot or multiple time slots.

[0157] The configuration periodicity of SPO may be the same as the configuration periodicity of the resource pool. Alternatively, the configuration periodicity of SPO may be different from the configuration periodicity of the resource pool. The configuration periodicity of SPO may be indicated by a combination of one or two or more of higher layer signaling, MAC signaling, and PHY signaling. SPO may be configured by a function instead of an SPO bitmap. The variables in the function for configuring SPO may be a system frame index, a radio frame index, resource pool configuration information (e.g., a resource bitmap), an identifier of a receiving terminal, an identifier of a transmitting terminal, a group ID, a cell ID, a transmission periodicity of an SL paging message (e.g., the configuration periodicity of SPO), and / or a new variable configured by higher layer signaling.

[0158] The radio frames capable of transmitting paging control information (e.g., DCI, SCI) and / or SL paging messages may be indicated by functions based on various variables, and the time slots capable of transmitting paging control information and / or SL paging messages within the radio frames may be indicated by an SPO bitmap. Alternatively, all radio frames and time slots capable of transmitting paging control information and / or SL paging messages may be indicated by a function. Alternatively, the radio frames capable of transmitting paging control information and / or SL paging messages may be indicated by a bitmap, and the time slots capable of transmitting paging control information and / or SL paging messages within the radio frames may be indicated by a function.

[0159] Fig.14 is a conceptual diagram illustrating a fifth exemplary embodiment of a SPO configuration method in a communication system.

[0160] like Fig.14As shown, the configuration periodicity of SPO (e.g., SPO time slot) may be different from the configuration periodicity of the resource pool. SPO may be configured every 4 radio frames, and the resource pool may be configured every 2 radio frames. The periodicity of SPO may be set in units of radio frames or n time slots. Here, n may be a natural number. The bitmap (e.g., resource bitmap and / or SPO bitmap) may be configured in units of n time slots. The unit of n time slots may be configured to be the same as the configuration unit of the resource pool. Alternatively, the unit of n time slots may be configured to be different from the configuration unit of the resource pool.

[0161] Fig.15 is a conceptual diagram illustrating a sixth exemplary embodiment of an SPO configuration method in a communication system.

[0162] like Fig.15 As shown, SPO (e.g., SPO time slot) can be configured non-continuously. That is, SPO can be distributed in time slots. The receiving terminal can wake up periodically to obtain the SL paging message and attempt to decode the SL paging message. In order to support this operation, the receiving terminal can periodically obtain a synchronization signal and can maintain synchronization based on the synchronization signal. Therefore, the SPO time slot can be configured considering the transmission periodicity of the synchronization signal. For example, the time slot after the transmission period of the synchronization signal can be configured as an SPO time slot. SPO (e.g., SPO time slot) can be relatively configured based on the transmission period of the synchronization signal in the resource pool.

[0163] When Fig.14 and Fig.15 When using Scheme 1 in the exemplary embodiment shown, the SPO bitmap may include 10 bits. That is, the size of the SPO bitmap may be the same as the size of the resource bitmap. Fig.14 and Fig.15 When using scheme 2 in the exemplary embodiment shown, the SPO bitmap may include 4 bits. That is, the SPO bitmap may indicate whether SPO is configured in each of the four time slots that are not configured as resource pools by the resource bitmap. The configuration periodicity of SPO may be the same as the configuration periodicity of the resource pool. Alternatively, the configuration periodicity of SPO may be set to be different from the configuration periodicity of the resource pool.

[0164] Periodic information (e.g., SPO and / or resource pool configuration periodic information) may be transmitted using a combination of one or two or more of higher layer signaling, MAC signaling, and PHY signaling. SPO may be configured by a function rather than an SPO bitmap. Alternatively, based on the transmission area of ​​a synchronization signal (e.g., S-SSB), SPO may be configured as m time slots starting from the kth time slot or as time slots from the kth time slot to the pth time slot. Information indicating the time slots for configuring SPO (e.g., k, m, and / or p) may be transmitted using a combination of one or two or more of higher layer signaling, MAC signaling, and PHY signaling. Here, each of k, m, and p may be a natural number.

[0165] SPO can be configured based on a function. The variables in the function for configuring SPO can be a system frame index, a radio frame index, resource pool configuration information (e.g., a resource bitmap), an ID of a receiving terminal, an ID of a transmitting terminal, a group ID, a cell ID, a transmission periodicity of an SL paging message (e.g., a configuration periodicity of SPO), variables related to the transmission resource configuration of a synchronization signal, and / or new variables configured by higher layer signaling.

[0166] The radio frames capable of transmitting paging control information and / or SL paging messages may be indicated by a function based on various variables, and the time slots capable of transmitting paging control information and / or SL paging messages within the corresponding radio frames may be indicated by an SPO bitmap. Alternatively, all radio frames and time slots capable of transmitting paging control information and / or SL paging messages may be indicated by a function. Alternatively, the radio frames capable of transmitting paging control information and / or SL paging messages may be indicated by a bitmap, and the time slots capable of transmitting paging control information and / or SL paging messages within the radio frames may be determined by a function.

[0167] Fig.16 is a conceptual diagram illustrating a seventh exemplary embodiment of a SPO configuration method in a communication system.

[0168] like Fig.16 As shown, SPO can be configured in a time slot within a radio frame in which a resource pool is not configured. Here, the resource bitmap of each of radio frames #2 and #6 can be set to [0 0 0 0 0 0 0 0 0]. SL paging messages can be transmitted for public safety. SPO can be configured in any resource outside the resource pool and can be used for a specific purpose. In this case, for the configuration of the radio frame configured with SPO, the periodicity information of the radio frame configured with SPO can be transmitted by a combination of one or two or more of higher layer signaling, MAC signaling and PHY signaling. Alternatively, the periodicity of the radio frame configured with SPO can be indicated by a function.

[0169] The SPO time slot within the radio frame can be indicated by an SPO bitmap or function. In this case, the variables in the function used to configure SPO (e.g., SPO time slot) can be a system frame index, a radio frame index, resource pool configuration information (e.g., a resource bitmap), an ID of a receiving terminal, an ID of a transmitting terminal, a group ID, a cell ID, a transmission periodicity of an SL paging message (e.g., a configuration periodicity of SPO), variables related to the transmission resource configuration of a synchronization signal, and / or new variables configured by higher layer signaling.

[0170] SPO can be configured only in the resource pool. Alternatively, SPO can be configured only in resources outside the resource pool. Resources outside the resource pool can be time slots of resource pools that are not configured in the radio frame to which the resource pool belongs, or radio frames that are not configured with resource pools. Figures 8 to 16 Alternatively, a combination of the exemplary embodiments shown can be used. Figures 8 to 16 The exemplary embodiments shown are extended and / or modified exemplary embodiments.

[0171] 3. Methods for configuring SPO in resource pools used in adjacent regions

[0172] Fig.17 is a conceptual diagram illustrating an eighth exemplary embodiment of an SPO configuration method in a communication system.

[0173] like Fig.17 As shown, a common SPO can be configured in a resource pool allocated to adjacent areas (e.g., area #1, area #2, area #3). Area can mean a region. The same resources (e.g., the same time slot) in the resource pool allocated to the adjacent areas can be configured as SPO. The same time slot can be a common time slot of the configured resource pool. In order to effectively perform SL paging operations in specific situations, the same resources can be configured as SPO. The specific situation can be when performing SL paging operations based on broadcast or multicast, when interference management (e.g., interference elimination) between SL paging messages is required, etc.

[0174] In each region, one resource region (e.g., a radio frame) may include 10 time slots, and a resource bitmap may include 10 bits to indicate whether a resource pool is configured in each of the 10 time slots belonging to one resource region. Alternatively, the number of bits included in the resource bitmap is not limited to 10, and may be set differently. The resource pool may be repeatedly configured with a specific periodicity based on the resource bitmap. The resource bitmap of region #1 may be set to [1 0 1 1 0 0 1 1 0 0], the resource bitmap of region #2 may be set to [0 0 1 0 0 1 1 0 1 1], and the resource bitmap of region #3 may be set to [0 1 1 1 1 0 1 0 0 0].

[0175] Fig.18 is a conceptual diagram illustrating a third exemplary embodiment of an SPO indication method in a communication system.

[0176] like Fig.18 As shown, the SPO bitmap may indicate whether SPO is configured in each of the time slots. The SPO bitmap may be configured based on Scheme 1 or Scheme 2. When Scheme 1 is used, the number of bits included in the SPO bitmap may be the same as the number of bits included in the resource bitmap. That is, the configuration unit of the SPO bitmap may be the same as the configuration unit of the resource bitmap. In this case, the SPO bitmap may indicate whether SPO is configured in each of all time slots (e.g., 10 time slots) associated with the resource bitmap. According to Scheme 1, the SPO bitmap may be set to [0 0 1 0 0 0 1 0 0 0].

[0177] Alternatively, SPO (e.g., SPO time slots) may be indicated based on the time slots in which the resource pool is configured for each region. When scheme 2 is used, it may be indicated whether SPO is configured in each of the time slots (e.g., 5 time slots) in which the resource pool is configured in all time slots (e.g., 10 time slots) associated with the resource bitmap. The time slots in which the resource pool is configured may be indicated by the resource bitmap. According to scheme 2, the SPO bitmap of region #1 may be set to [0 1 0 1 0], the SPO bitmap of region #2 may be set to [1 0 1 0 0], and the SPO bitmap of region #3 may be set to [0 1 0 0 1]. A bit set to a first value (e.g., 0) in the SPO bitmap may indicate that SPO is not configured in the time slot mapped to the bit, and a bit set to a second value (e.g., 1) in the SPO bitmap may indicate that SPO is configured in the time slot mapped to the bit.

[0178] When scheme 2 is used, since the time slots for configuring the resource pool are different for each region, even if the same time slot is configured as the SPO time slot in the region, the SPO bitmap may be set differently for each region.

[0179] Fig.19 is a conceptual diagram illustrating a ninth exemplary embodiment of a SPO configuration method in a communication system.

[0180] like Fig.19 As shown, the common SPO can be configured in the same resource (eg, the same time slot) as that in the adjacent areas (eg, area #1, area #2, area #3) which is not configured as a resource pool. The same time slot can be a shared time slot which is not configured as a resource pool.

[0181] Fig. 20 is a conceptual diagram illustrating a fourth exemplary embodiment of an SPO indication method in a communication system.

[0182] like Fig. 20 As shown, the SPO bitmap may indicate whether SPO is configured in each of the time slots. The SPO bitmap may be configured based on Scheme 1 or Scheme 2. When Scheme 1 is used, the number of bits included in the SPO bitmap may be the same as the number of bits included in the resource bitmap. In this case, the SPO bitmap may indicate whether SPO is configured in each of all time slots (e.g., 10 time slots) associated with the resource bitmap. According to Scheme 1, the SPO bitmap may be set to [0 0 1 0 0 0 1 0 00].

[0183] When scheme 2 is used, it can be indicated whether each of the time slots (e.g., 7 time slots) in which the resource pool is not configured among all time slots (e.g., 10 time slots) associated with the resource bitmap is configured with SPO. The time slots in which the resource pool is not configured can be indicated by the resource bitmap. According to scheme 2, the SPO bitmap of area #1 can be set to [0 1 0 0 1 0 0], the SPO bitmap of area #2 can be set to [0 0 1 0 0 1 0], and the SPO bitmap of area #3 can be set to [0 1 0 1 0 0 0].

[0184] SPO (e.g., SPO time slot) may be indicated by a function instead of an SPO bitmap. In this case, the variables in the function for configuring SPO may be a system frame index, a radio frame index, resource pool configuration information (e.g., a resource bitmap), an ID of a receiving terminal, an ID of a transmitting terminal, a group ID, a cell ID, a transmission periodicity of an SL paging message (e.g., a configuration periodicity of SPO), variables related to the transmission resource configuration of a synchronization signal, and / or new variables configured by higher layer signaling.

[0185] The periodicity of a resource region consisting of a radio frame or n time slots may be indicated by a combination of one or two or more of higher layer signaling, MAC signaling, and PHY signaling. Alternatively, the periodicity of a resource region consisting of a radio frame or n time slots may be indicated by a function or a bitmap. Here, n may be a natural number.

[0186] 4. Methods for identifying SL paging messages

[0187] The receiving terminal may perform a monitoring operation on the reception of the SL paging message in the SPO. In this case, a control and / or data channel related to the SL paging operation may be transmitted based on an ID (e.g., SL-P-RNTI) indicating the transmission of the SL paging message. When it is identified that the message received at the receiving terminal is a SL paging message, the receiving terminal may perform a decoding operation on the received message. The identification operation of the SL paging message may be performed based on the SL-P-RNTI.

[0188] The receiving terminal can identify whether the receiving terminal's own ID, the ID of the group to which the receiving terminal belongs, the ID of the cell to which the receiving terminal belongs, or the broadcast ID exists in the SL paging message. When the corresponding ID exists in the SL paging message, the receiving terminal can perform a pre-configured operation. The pre-configured operation can be an RRC reconfiguration operation, a system information (e.g., updated system information) acquisition operation, or a public safety message reception operation.

[0189] An ID for broadcast-based sidelink communication (hereinafter referred to as a "broadcast ID") may be preconfigured between a transmitting terminal and a receiving terminal. When a broadcast ID is present in a SL paging message, all receiving terminals may decode the SL paging message. The broadcast ID may be associated with a specific short message for public safety. In this case, the receiving terminal may identify the broadcast information (e.g., a specific short message for public safety) based on the broadcast ID.

[0190] Multiple IDs can be preconfigured for the transmission of multiple short messages. In addition to transmitting public safety information, short messages can be used to transmit information required in V2X communication. The above operation can be applied to multicast communication and / or unicast communication as well as broadcast communication.

[0191] In a multicast communication (e.g., a side link communication based on multicast), a SL paging operation for multiple receiving terminals can be performed based on an ID commonly used by the group (e.g., a group ID). When a group ID is present in a SL paging message, a receiving terminal belonging to the group can decode the SL paging message based on the group ID, and perform a pre-configured operation based on an information element included in the SL paging message. The pre-configured operation may be an RRC reconfiguration operation, a system information (e.g., updated system information) acquisition operation, or a public safety message reception operation. The group ID may be the ID of the transmitting terminal. Alternatively, the group ID may be an ID representing a group pre-configured between the transmitting terminal and the receiving terminal.

[0192] In unicast communication (e.g., unicast-based sidelink communication), a SL paging operation for a specific receiving terminal may be performed based on the ID of the transmitting terminal and / or the ID of the receiving terminal. When the ID of the transmitting terminal and / or the ID of the receiving terminal are present in the SL paging message, the receiving terminal may decode the SL paging message based on the ID of the transmitting terminal and / or the ID of the receiving terminal, and may perform a preconfigured operation based on the information elements included in the SL paging message.

[0193] In V2X communication, the SL paging operation may be indicated by a scrambling sequence for the first-stage SCI (e.g., a specific ID or SL-P-RNTI related to the SL paging message), CRC masking, etc. The receiving terminal may recognize that the SL paging message is transmitted by receiving the first-stage SCI. The ID indicating the target of SL paging in each of unicast communication, multicast communication, and broadcast communication may be included in the second-stage SCI. Alternatively, the ID indicating the target of SL paging in each of unicast communication, multicast communication, and broadcast communication may be transmitted via the data area of ​​the PSSCH corresponding to the SCI (e.g., the PSSCH scheduled by the SCI). Alternatively, a portion of the ID indicating the target of SL paging in each of unicast communication, multicast communication, and broadcast communication may be included in the second-stage SCI, and the remaining ID may be included in the data area of ​​the PSSCH.

[0194] When the SL paging message is transmitted from the base station to the receiving terminal, the DCI or SCI related to the SL paging message may include the ID of the sending terminal, so that the receiving terminal identifies the sending terminal related to the SL paging message. In unicast communication, the DCI or SCI related to the SL paging message may further include the ID of the sending terminal. In multicast communication, the DCI or SCI related to the SL paging message may further include the group ID. The ID used to identify the sending terminal may be the same as the ID used to indicate the SL paging target. Alternatively, the ID used to identify the sending terminal may be partially the same as the ID used to indicate the SL paging target.

[0195] [SPO configuration method independent of resource pool]

[0196] SPO can be configured independently of the resource pool. For example, the base station can configure SPO (e.g., side link resources for sending and receiving paging control information and / or SL paging messages) to the terminal (e.g., a transmitting terminal and / or a receiving terminal). SPO can be configured in multiple time slots. The multiple time slots configured for SPO can have a specific periodicity. That is, SPO can be configured repeatedly. In this case, SPO can overlap (e.g., partially overlap) with the resource pool of the transmitting terminal and / or the receiving terminal. SPO can be configured by a bitmap similar to the configuration method of the resource pool. SPO configured by the bitmap can be repeated according to a preset periodicity. A bit included in the bitmap can be mapped to one time slot or multiple time slots. The time slot mapped to each bit included in the bitmap can be a time slot at a specific time point in each of the wireless frames.

[0197] For example, a bitmap with a size of 5 bits may be set to [0 0 0 0 1]. In the bitmap, the first bit may be mapped to radio frame #n, the second bit may be mapped to radio frame #n+1, the third bit may be mapped to radio frame #n+2, the fourth bit may be mapped to radio frame #n+3, and the fifth bit may be mapped to radio frame #n+4. Here, n may be an integer of 0 or greater. The bitmap may indicate that SPO is configured in a time slot from the xth time slot to the yth time slot in radio frame #n+4, or in a z time slot starting from the xth time slot. Here, x, y and / or z may be indicated by a combination of one or two or more of higher layer signaling, MAC signaling, and PHY signaling. Alternatively, the time slot in which SPO is configured in the fifth radio frame may be indicated by an additional bitmap.

[0198] When a resource area for transmitting a SL paging message is configured, the base station and / or the transmitting terminal may transmit the SL paging message in the corresponding resource area, and the receiving terminal may perform a monitoring operation on the reception of the SL paging message in the corresponding resource area. In order to identify / classify the SL paging message in the receiving terminal, the above-mentioned operation, an operation extended from the above-mentioned operation, and / or an operation modified from the above-mentioned operation may be performed.

[0199] The exemplary embodiments of the present invention can be implemented as program instructions that are executable by various computers and recorded on computer-readable media. Computer-readable media may include program instructions, data files, data structures, or combinations thereof. The program instructions recorded on the computer-readable media may be designed and configured specifically for the present invention, or may be known and available to those skilled in the art of computer software.

[0200] Examples of computer-readable media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include machine codes made by, for example, a compiler, and high-level language codes executable by a computer using an interpreter. The above exemplary hardware devices may be configured to operate as at least one software module to perform embodiments of the present invention, and vice versa.

[0201] Although the exemplary embodiments of the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the scope of the invention.

Claims

1. An operating method of a transmitting terminal in a communication system, the operating method comprising: receiving sidelink paging configuration information from a base station; receiving, from a base station, paging downlink control information in a sidelink paging occasion indicated by the sidelink paging configuration information; as well as sending a sidelink paging message to one or more receiving terminals in the sidelink resources indicated by the paging downlink control information, The sidelink paging configuration information further includes a sidelink-paging-radio network temporary identifier, and the paging downlink control information is received using the sidelink-paging-radio network temporary identifier.

2. The operating method according to claim 1, wherein: A sidelink-paging-radio network temporary identifier is configured for each broadcast type, and the broadcast type is unicast, multicast, or broadcast.

3. The operating method according to claim 1, wherein: The paging downlink control information further includes an identifier indicating a broadcast type of the sidelink paging message, and the identifier is an identifier of a transmitting terminal, a group identifier, or a broadcast identifier.

4. The operating method according to claim 1, further comprising: When the transmission of the sidelink paging message is completed, sidelink communication with one or more receiving terminals is performed according to a broadcast type associated with the sidelink paging message, wherein the broadcast type is unicast, multicast, or broadcast.

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