Method and apparatus for allocating sidelink resources in a communication system

Abstract

A method and apparatus for allocating sidelink resources in a communication system are disclosed. An operation method of a first terminal includes generating a first-stage SCI including first resource allocation information and a first indicator indicating whether a second-stage SCI includes second resource allocation information, transmitting the first-stage SCI to a second terminal through a PSCCH, and performing sidelink communication with the second terminal by using a first resource region indicated by the first resource allocation information.

Description

Technical Field

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

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

[0003] 4G and 5G communication systems can support vehicle-to-everything (V2X) communication (e.g., sidelink communication). V2X communication supported in cellular communication systems such as 4G and 5G can be referred to as "Cellular-Vehicle-to-everything (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, and vehicle-to-network (V2N) communication, among others.

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

[0005] On the other hand, it may be necessary to allocate sidelink resources for data (e.g., V2X data) transmission. When using a resource allocation mode based on time and frequency resources for sensing operations, a resource reservation-based operation scheme may be needed to reliably allocate resources for data transmission. To support the resource reservation-based operation scheme, an efficient method for operating the sidelink channel may be required. Summary of the Invention

[0006] Technical issues

[0007] The purpose of this disclosure in order to solve the above problems is to provide a method and apparatus for allocating sidelink resources in a communication system.

[0008] Technical solution

[0009] According to a first exemplary embodiment of the present disclosure for achieving the purpose, an operation method of a first terminal may include: generating first-stage sidelink control information (SCI), the first-stage SCI including first resource allocation information and a first indicator indicating whether a second-stage SCI includes second resource allocation information; transmitting the first-stage SCI to a second terminal on a physical sidelink control channel (PSCCH); and performing sidelink communication with the second terminal by utilizing a first resource area indicated by the first resource allocation information.

[0010] The operation method of the first terminal may further include: when the first indicator indicates that the second stage SCI includes the second resource allocation information, transmitting the second stage SCI including the second resource allocation information to the second terminal on the physical side link shared channel (PSSCH), wherein the second resource area indicated by the second resource allocation information is different from the first resource area.

[0011] When the first indicator indicates that the second-stage SCI does not include the second resource allocation information, the transmission of the second-stage SCI associated with the first-stage SCI can be omitted.

[0012] The first-stage SCI may further include a second indicator indicating the usage scheme of the side-link channel. The second indicator set to a first value may indicate that the PSCCH is used to transmit the first-stage SCI and the PSSCH is used to transmit the second-stage SCI and data. The second indicator set to a second value may indicate that the PSCCH is used to transmit the first-stage SCI and the PSSCH is used to transmit the second-stage SCI.

[0013] The usage schemes of the side link channel, including PSCCH and PSSCH, can be classified into Scheme 1 and Scheme 2. When using Scheme 1, PSCCH can be used to transmit the first-stage SCI, and PSSCH can be used to transmit the second-stage SCI and data. When using Scheme 2, PSCCH can be used to transmit the first-stage SCI, and PSSCH can be used to transmit the second-stage SCI. Scheme 1 can be used when the data size is less than or equal to the threshold, and Scheme 2 can be used when the data size exceeds the threshold.

[0014] The first resource allocation information can indicate the resource areas of n SL channels, and the second resource allocation information can indicate the resource areas of k SL channels. Each of the n SL channels and the k SL channels can include a PSCCH and a PSSCH belonging to the same set of resource blocks (RBs), and each of n and k can be a natural number.

[0015] One of n, k, and (n+k) can be obtained from the base station through one or more of higher-layer signaling, media access control (MAC) signaling, and physical (PHY) signaling.

[0016] Sidelink channels, including PSCCH and PSSCH, can be transmitted during monitoring, which can be configured for a specific broadcast scheme, which can be one of unicast, multicast, or broadcast.

[0017] According to a second exemplary embodiment of the present disclosure for achieving the purpose, an operation method of a second terminal may include: receiving first stage sidelink control information (SCI) from a first terminal on a physical sidelink control channel (PSCCH); identifying first resource allocation information and a first indicator indicating whether a second stage SCI includes second resource allocation information, the first resource allocation information and the first indicator being included in the first stage SCI; and performing a monitoring operation on a physical sidelink shared channel (PSSCH) to receive the second stage SCI from the first terminal when the first indicator indicates that the second stage SCI includes the second resource allocation information.

[0018] The first resource allocation information can indicate the resource areas of n SL channels, and the second resource allocation information can indicate the resource areas of k SL channels. Each of the n SL channels and the k SL channels can include a PSCCH and a PSSCH belonging to the same set of resource blocks (RBs), and each of n and k can be a natural number.

[0019] One of n, k, and (n+k) can be obtained from the base station through one or more of higher-layer signaling, media access control (MAC) signaling, and physical (PHY) signaling.

[0020] Sidelink channels, including PSCCH and PSSCH, can be received during monitoring, which can be configured for a specific broadcast scheme, which can be one of unicast, multicast, or broadcast.

[0021] The first-stage SCI may further include a second indicator indicating the usage scheme of the side-link channel. The second indicator set to a first value may indicate that the PSCCH is used to transmit the first-stage SCI and the PSSCH is used to transmit the second-stage SCI and data. The second indicator set to a second value may indicate that the PSCCH is used to transmit the first-stage SCI and the PSSCH is used to transmit the second-stage SCI.

[0022] The usage schemes of the side link channel, including PSCCH and PSSCH, can be classified into Scheme 1 and Scheme 2. When using Scheme 1, PSCCH can be used to transmit the first-stage SCI, and PSSCH can be used to transmit the second-stage SCI and data. When using Scheme 2, PSCCH can be used to transmit the first-stage SCI, and PSSCH can be used to transmit the second-stage SCI. Scheme 1 can be used when the data size is less than or equal to the threshold, and Scheme 2 can be used when the data size exceeds the threshold.

[0023] The threshold can be obtained from the base station through one or more of the following: higher-layer signaling, MAC signaling, and PHY signaling.

[0024] According to a third exemplary embodiment of this disclosure for the purposes of this disclosure, a first terminal may include: a processor; and a memory storing at least one instruction executable by the processor, wherein the at least one instruction causes the first terminal to: generate first-stage sidelink control information (SCI), the first-stage SCI including first resource allocation information and a first indicator indicating whether a second-stage SCI includes second resource allocation information; transmit the first-stage SCI to a second terminal on a physical sidelink control channel (PSCCH); and perform sidelink communication with the second terminal by utilizing a first resource area indicated by the first resource allocation information.

[0025] When the first indicator indicates that the second stage SCI includes second resource allocation information, at least one instruction can further cause the first terminal to transmit the second stage SCI including the second resource allocation information to the second terminal on the physical side link shared channel (PSSCH), wherein the second resource area indicated by the second resource allocation information is different from the first resource area.

[0026] The first-stage SCI may further include a second indicator indicating the usage scheme of the side-link channel. The second indicator set to a first value may indicate that the PSCCH is used to transmit the first-stage SCI and the PSSCH is used to transmit the second-stage SCI and data. The second indicator set to a second value may indicate that the PSCCH is used to transmit the first-stage SCI and the PSSCH is used to transmit the second-stage SCI.

[0027] The first resource allocation information can indicate the resource areas of n SL channels, and the second resource allocation information can indicate the resource areas of k SL channels. Each of the n SL channels and the k SL channels can include a PSCCH and a PSSCH belonging to the same set of resource blocks (RBs), and each of n and k can be a natural number.

[0028] Sidelink channels, including PSCCH and PSSCH, can be transmitted during monitoring, which can be configured for a specific broadcast scheme, which can be one of unicast, multicast, or broadcast.

[0029] Technical effect

[0030] According to this disclosure, sidelink resources can be allocated via a first-stage sidelink control information (SCI) and / or a second-stage SCI, and the allocated sidelink resources can be used to perform sidelink communication. Furthermore, the first-stage SCI may include information elements to support sidelink resource allocation, and sidelink resources can be efficiently allocated based on the information elements included in the first-stage SCI. Therefore, the performance of the communication system can be improved. Attached Figure Description

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

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

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

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

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

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

[0037] Figure 7 This is a conceptual diagram illustrating a first exemplary embodiment of a method for allocating sidelink resources.

[0038] Figure 8 This is a conceptual diagram illustrating a second exemplary embodiment of a method for allocating sidelink resources.

[0039] Figure 9 This is a conceptual diagram illustrating a third exemplary embodiment of a method for allocating sidelink resources.

[0040] Figure 10 This is a sequence diagram illustrating a first exemplary embodiment of a sidelink communication method.

[0041] Figure 11 This is a sequence diagram illustrating a second exemplary embodiment of the sidelink communication method.

[0042] Figure 12 This is a sequence diagram illustrating a third exemplary embodiment of the sidelink communication method.

[0043] Figure 13 This is a sequence diagram illustrating a fourth exemplary embodiment of the sidelink communication method. Detailed Implementation

[0044] While the invention may have various modifications and embodiments, specific embodiments are shown by way of example and described in detail in the accompanying drawings. However, it should be understood that this description is not intended to limit the invention to the specific embodiments, but rather, the invention is to encompass all modifications, equivalents, and alternatives that fall within the spirit and scope of the invention.

[0045] Although the terms “first,” “second,” etc., may be used herein to describe various components, these components should not be construed as being limited by these terms. These terms are used only to distinguish one component from another. For example, a first component may be referred to as a second component, and a second component may be referred to as a first component, without departing from the scope of the invention. The term “and / or” includes any one and all combinations of more than one of the related listed items.

[0046] What will be understood is that when a component is referred to as "connected" or "linked" to another component, it can mean that the component is directly connected to or linked to another component, or that there are other components between the components. Conversely, when a component is referred to as "directly connected" or "directly linked" to another component, there are no other components between the components.

[0047] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. Singular forms as used herein include plural forms unless the context clearly indicates otherwise. It should be understood that terms such as “comprising” or “having” as used in this disclosure are used to specify the presence of features, quantities, steps, operations, components, parts, and / or combinations thereof described in the specification, and not to presuppose the presence or additional possibilities of more than one other feature, quantity, step, operation, component, part, and / or combination thereof.

[0048] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in general dictionaries shall be interpreted as having the same meaning as they have in the context of the relevant art, and shall not be interpreted as having an idealized or overly formal meaning unless expressly defined herein.

[0049] In the following description, 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, the same reference numerals refer to the same components in the drawings, and repeated descriptions of the same components will be omitted.

[0050] Figure 1 This is a conceptual diagram illustrating a V2X communication scenario.

[0051] like Figure 1 As shown, V2X communication can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc. V2X communication can be supported by a cellular communication system (e.g., a cellular communication network) 140, and V2X communication supported by the cellular communication system 140 can be referred to as "cellular-V2X (C-V2X) communication." Here, the cellular communication system 140 can include a 4G communication system (e.g., an LTE communication system or an LTE-A communication system), a 5G communication system (e.g., an NR communication system), etc.

[0052] V2V communication can include communication between vehicle #1 100 (e.g., a communication node located in vehicle #1 100) and vehicle #2 110 (e.g., a communication node located in vehicle #2 110). Driving information (e.g., velocity, heading, time, position, etc.) can be exchanged between vehicles 100 and 110 via V2V communication. For example, autonomous driving (e.g., platooning) can be supported based on the driving information exchanged via V2V communication. V2V communication supported in cellular communication system 140 can be performed based on "sidelink" communication technologies (e.g., ProSe communication technology and D2D communication technology, etc.). In this case, communication between vehicles 100 and 110 can be performed using at least one sidelink channel established between vehicles 100 and 110.

[0053] V2I communication can refer to communication between vehicle #1 100 (e.g., a communication node located in vehicle 100) and roadside infrastructure (e.g., a roadside unit (RSU)) 120. Infrastructure 120 may also include traffic lights or streetlights located on the roadside. For example, when performing V2I communication, communication can be performed between a communication node located in vehicle #1 100 and a communication node located in a traffic light. Traffic information, driving information, etc., can be exchanged between vehicle #1 100 and infrastructure 120 via V2I communication. V2I communication supported in cellular communication system 140 can also be performed based on sidelink communication technologies (e.g., ProSe communication technology and D2D communication technology). In this case, communication between vehicle #1 100 and infrastructure 120 can be performed using at least one sidelink channel established between vehicle 100 and infrastructure 120.

[0054] V2P communication can represent communication between vehicle #1 100 (e.g., a communication node located in vehicle #1 100) and person 130 (e.g., a communication node carried by person 130). Driving information of vehicle #1 100 and motion information of person 130 (e.g., speed, heading, time, position, etc.) can be exchanged between vehicle #1 100 and person 130 via V2P communication. The communication node located in vehicle #1 100 or the communication node carried by person 130 can generate a hazard warning based on the acquired driving and motion information to determine a dangerous situation. V2P communication supported by cellular communication system 140 can be performed based on sidelink communication technology (e.g., ProSe communication technology and D2D communication technology, etc.). In this case, communication between the communication node located in vehicle #1 100 and the communication node carried by person 130 can be performed using at least one sidelink channel established between the communication nodes.

[0055] V2N communication can be communication between vehicle #1 100 (e.g., a communication node located in vehicle #1 100) and a server connected via a cellular communication system (e.g., a cellular communication network) 140. V2N communication can be performed based on 4G communication technologies (e.g., LTE or LTE-A technologies as defined in the 3GPP standard) or 5G communication technologies (e.g., NR technologies as defined in the 3GPP standard). Furthermore, V2N communication can be performed based on communication technologies defined in the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard (e.g., Wireless Access in Vehicular Environments (WAVE) communication technology, Wireless Local Area Network (WLAN) communication technology, etc.) or communication technologies defined in the IEEE 802.15 standard (e.g., Wireless Personal Area Network (WPAN) communication technology, etc.).

[0056] On the other hand, the cellular communication system 140 that supports V2X communication can be configured as follows.

[0057] Figure 2 This is a conceptual diagram illustrating a first exemplary embodiment of a cellular communication system.

[0058] like Figure 2As shown, a cellular communication system may include an access network, a core network, etc. The access network may include base stations 210, relays 220, user equipment (UEs) 231 to 236, etc. UEs 231 to 236 may include those located at... Figure 1 The communication nodes in vehicles 100 and 110, located Figure 1 Communication nodes in infrastructure 120 Figure 1 The core network may include communication nodes carried by the person 130, etc. When the cellular communication system supports 4G communication technology, the core network may include a serving-gateway (S-GW) 250, a packet data network (PDN) gateway (P-GW) 260, a mobility management entity (MME) 270, etc.

[0059] When a cellular communication system supports 5G communication technology, the core network may include user plane function (UPF) 250, session management function (SMF) 260, access and mobility management function (AMF) 270, etc. Alternatively, when a cellular communication system supports non-standalone (NSA) networking, the core network consisting of S-GW 250, P-GW 260, and MME 270 can support both 4G and 5G communication technologies, while the core network consisting of UPF 250, SMF 260, and AMF 270 can support both 5G and 4G communication technologies.

[0060] Furthermore, when a cellular communication system supports network slicing technology, the core network can be divided into multiple logical network slices. For example, network slices that support V2X communication can be configured (e.g., V2V network slices, V2I network slices, V2P network slices, V2N network slices, etc.), and V2X communication can be supported through V2X network slices configured in the core network.

[0061] The communication nodes constituting a cellular communication system (e.g., base stations, repeaters, UEs, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) can utilize code division multiple access (CDMA), wideband CDMA (WCDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiplexing (OFDM), filtered OFDM, single carrier FDMA (SC-FDMA), non-orthogonal multiple access (NOMA), generalized frequency division multiplexing (GFDM), filter bank multi-carrier (FBMC), and universal filtered multi-carrier (FBMC) technologies. Communication is performed using at least one of the following communication technologies: multi-carrier (UFMC) technology and space division multiple access (SDMA) technology.

[0062] The communication nodes that constitute a cellular communication system (e.g., base stations, repeaters, UEs, S-GWs, P-GWs, MMEs, UPFs, SMFs, AMFs, etc.) can be configured as follows.

[0063] Figure 3 This is a block diagram illustrating a first exemplary embodiment of a communication node constituting a cellular communication system.

[0064] like Figure 3 As shown, the communication node 300 may include at least one processor 310, a memory 320, and a transceiver 330 connected to a network to perform communication. Furthermore, the communication node 300 may further include an input interface device 340, an output interface device 350, a storage device 360, etc. Each component included in the communication node 300 can communicate with each other when connected via a bus 370.

[0065] 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 being connected to the processor 310 via a common bus 370. For example, the processor 310 may be connected to at least one of the memory 320, transceiver 330, input interface device 340, output interface device 350, and storage device 360 ​​via a dedicated interface.

[0066] Processor 310 can execute program instructions stored in at least one of memory 320 and storage device 360. Processor 310 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor that performs methods according to embodiments of the present disclosure. Each of memory 320 and storage device 360 ​​may include at least one of volatile storage media and non-volatile storage media. For example, memory 320 may include at least one of read-only memory (ROM) and random access memory (RAM).

[0067] Refer again Figure 2 In the communication system, base station 210 can form macro cells or small cells and can connect to the core network via ideal or non-ideal backhaul. Base station 210 can transmit signals received from the core network to UEs 231 to 236 and repeater 220, and can also transmit signals received from UEs 231 to 236 and repeater 220 to the core network. UEs #1 231, UE #2 232, UE #4 234, UE #5 235, and UE #6 236 can belong to the cell coverage area of ​​base station 210. UEs #1 231, UE #2 232, UE #4 234, UE #5 235, and UE #6 236 can connect to base station 210 by performing a connection establishment procedure with base station 210. UE#1 231, UE#2 232, UE#4 234, UE#5 235 and UE#6 236 can communicate with base station 210 after connecting to base station 210.

[0068] Repeater 220 can connect to base station 210 and relay communication between base station 210 and UE#3 233 and UE#4 234. That is, repeater 220 can transmit signals received from base station 210 to UE#3 233 and UE#4 234, and can also transmit signals received from UE#3 233 and UE#4 234 to base station 210. UE#4 234 can be within the cell coverage area of ​​both base station 210 and repeater 220, and UE#3 233 can be within the cell coverage area of ​​repeater 220. That is, UE#3 233 can be located outside the cell coverage area of ​​base station 210. UE#3 233 and UE#4 234 can connect to repeater 220 by performing a connection establishment procedure. UE#3 233 and UE#4 234 can communicate with repeater 220 after connecting to it.

[0069] Base station 210 and repeater 220 can support multiple-input multiple-output (MIMO) communication technologies (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) communication technologies, carrier aggregation (CA) communication technologies, unlicensed band communication technologies (e.g., Licensed Assisted Access (LAA), enhanced LAA (eLAA), etc.), and sidelink communication technologies (e.g., ProSe communication technologies, D2D communication technologies). UE#1 231, UE#2 232, UE#5 235, and UE#6 236 can perform operations corresponding to base station 210 and operations supported by base station 210. UE#3 233 and UE#4 234 can perform operations corresponding to repeater 220 and operations supported by repeater 220.

[0070] Here, base station 210 can be referred to as Node B (NB), Evolved Node B (eNB), Base Transceiver Station (BTS), Radio Remote Header (RRH), Transmission Reception Point (TRP), Radio Unit (RU), Roadside Unit (RSU), Radio Transceiver, Access Point, or Node. Repeater 220 can be referred to as Small Base Station or Relay Node. Each of UEs 231 to 236 can be referred to as Terminal, Access Terminal, Mobile Terminal, Station, Subscriber Station, Mobile Station, Portable Subscriber Station, Node, Equipment, or On-Broad Unit (OBU).

[0071] On the other hand, communication between UE#5 235 and UE#6 236 can be performed based on sidelink communication technologies (e.g., ProSe communication technology, D2D communication technology). Sidelink communication can be performed based on a one-to-one or one-to-many scheme. When performing V2V communication using sidelink communication technology, UE#5 235 can be located at... Figure 1 The communication node in vehicle #1 100, UE #6 236 can be located in Figure 1 The communication node in vehicle #2 110. When performing V2I communication using sidelink communication technology, UE #5 235 can be located in Figure 1 The communication node in vehicle #1 100, UE #6 236 can be located in Figure 1 The communication node in infrastructure 120. When performing V2P communication using sidelink communication technology, UE#5 235 can be located in Figure 1 The communication node in vehicle #1 100, UE #6 236 can be Figure 1 The communication node carried by person 130.

[0072] As shown in Table 1 below, application sidelink communication scenarios can be classified according to the location of the UEs participating in sidelink communication (e.g., UE#5 235 and UE#6 236). For example, Figure 2 The sidelink communication scenario between UE#5 235 and UE#6 236 shown can be sidelink communication scenario #C.

[0073] [Table 1]

[0074] Side link communication scenarios Location of UE#5 235 Location of UE#6 236 #A Outside the coverage area of ​​base station 210 Outside the coverage area of ​​base station 210 #B Within the coverage area of ​​base station 210 Outside the coverage area of ​​base station 210 #C Within the coverage area of ​​base station 210 Within the coverage area of ​​base station 210 #D Within the coverage area of ​​base station 210 Within the coverage area of ​​other base stations

[0075] On the other hand, the user plane protocol stack of a UE that performs sidelink communication (e.g., UE#5 235 and UE#6 236) can be configured as follows.

[0076] Figure 4 This is a block diagram illustrating a first exemplary embodiment of the user plane protocol stack of a UE performing sidelink communication.

[0077] like Figure 4 As shown, UE#5 235 can be Figure 2 The UE#5 235 and UE#6 236 shown can be Figure 2 The example shown is UE#6236. The sidelink communication scenario between UE#5 235 and UE#6 236 can be one of the sidelink communication scenarios #A to #D in Table 1. The user plane protocol stack for each of UE#5 235 and UE#6 236 may include a Physical (PHY) layer, a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a Packet Data Convergence Protocol (PDCP) layer.

[0078] Sidelink communication between UE#5 235 and UE#6 236 can be performed using the PC5 interface (e.g., PC5-U interface). Layer 2 identifiers (IDs) (e.g., source Layer 2 ID, destination Layer 2 ID) can be used for sidelink communication, and these IDs can be configured for V2X communication (e.g., V2X services). Furthermore, hybrid automatic repeat request (HARQ) feedback operations can be supported in sidelink communication, and RLC acknowledged mode (RLC AM) or RLC unacknowledged mode (RLC UM) can be supported.

[0079] On the other hand, the control plane protocol stack of the UE performing sidelink communication (e.g., UE#5 235 and UE#6 236) can be configured as follows.

[0080] Figure 5 This is a block diagram illustrating a first exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication. Figure 6 This is a block diagram illustrating a second exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication.

[0081] like Figure 5 and Figure 6 As shown, UE#5 235 can be Figure 2 The UE#5 235 and UE#6 236 shown can be Figure 2 The sidelink communication scenario between UE#6 236 and UE#5 235 can be one of the sidelink communication scenarios #A to #D in Table 1. Figure 5 The control plane protocol stack shown can be a control plane protocol stack used for sending and receiving broadcast information (e.g., Physical Sidelink Broadcast Channel, PSBCH)).

[0082] Figure 5 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, and a radio resource control (RRC) layer. Sidelink communication between UE#5 235 and UE#6 236 can be performed using a PC5 interface (e.g., a PC5-C interface). Figure 6 The control plane protocol stack shown can be a control plane protocol stack used for one-to-one side link communication. Figure 6The control plane protocol stack shown may include the PHY layer, MAC layer, RLC layer, PDCP layer, and PC5 signaling protocol layer.

[0083] On the other hand, the channels used in sidelink communication between UE#5 235 and UE#6 236 may include the Physical Sidelink Shared Channel (PSSCH), the Physical Sidelink Control Channel (PSCCH), the Physical Sidelink Discovery Channel (PSDCH), and the Physical Sidelink Broadcast Channel (PSBCH). The PSSCH can be used to send and receive sidelink data and can be configured in the UE (e.g., UE#5 235 or UE#6 236) via higher-layer signaling. The PSCCH can be used to send and receive sidelink control information (SCI) and can also be configured in the UE (e.g., UE#5 235 or UE#6 236) via higher-layer signaling.

[0084] PSDCH can be used in the discovery process. For example, discovery signals can be sent via PSDCH. PSBCH can be used to send and receive broadcast information (e.g., system information). Furthermore, demodulation-reference signals (DM-RS), synchronization signals, etc., can be used in sidelink communication between UE#5 235 and UE#6 236. Synchronization signals can include primary sidelink synchronization signals (PSSS) and secondary sidelink synchronization signals (SSSS).

[0085] On the other hand, the sidelink transmission modes (TM) can be classified into sidelink TM#1 to TM#4 as shown in Table 2 below.

[0086] [Table 2]

[0087] Side Link™ illustrate #1 Transmission using base station scheduling resources #2 UE transmits autonomously without base station scheduling #3 In V2X communication, resources scheduled by the base station are used for transmission. #4 In V2X communication, the UE transmits autonomously without the need for base station scheduling.

[0088] When sidelink TM#3 or TM#4 is supported, each of UE#5 235 and UE#6 236 can utilize a resource pool configured by base station 210 to perform sidelink communication. A resource pool can be configured for each of the sidelink control information and sidelink data.

[0089] The resource pool for sidelink control information can be configured based on RRC signaling procedures (e.g., dedicated RRC signaling procedures, broadcast RRC signaling procedures). The resource pool for receiving sidelink control information can be configured via a broadcast RRC signaling procedure. When sidelink TM#3 is supported, the resource pool for transmitting sidelink control information can be configured via a dedicated RRC signaling procedure. In this case, sidelink control information can be transmitted using resources scheduled by base station 210 within the resource pool configured via the dedicated RRC signaling procedure. When sidelink TM#4 is supported, the resource pool for transmitting sidelink control information can be configured via either a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, sidelink control information can be transmitted using resources autonomously selected by the UE (e.g., UE#5 235 or UE#6 236) within the resource pool configured via the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0090] When sidelink TM#3 is supported, a resource pool for transmitting and receiving sidelink data does not need to be configured. In this case, sidelink data can be transmitted and received using resources scheduled by base station 210. When sidelink TM#4 is supported, a resource pool for transmitting and receiving sidelink data can be configured via a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, sidelink data can be transmitted and received using resources autonomously selected by the UE (e.g., UE#5 235 or UE#6 236) within the resource pool configured via the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0091] The method for allocating sidelink resources will be described below. Even when describing a method to be performed at a first communication node (e.g., transmitting or receiving signals), the corresponding second communication node can also perform a method corresponding to the method performed at the first communication node (e.g., receiving or transmitting signals). That is, when describing the operation of UE#1 (e.g., vehicle #1), the corresponding UE#2 (e.g., vehicle #2) can perform an operation corresponding to the operation of UE#1. Conversely, when describing the operation of UE#2, the corresponding UE#1 can perform an operation corresponding to the operation of UE#2. In the exemplary embodiments described below, the operation of the vehicle can be the operation of a communication node located in the vehicle.

[0092] In an exemplary embodiment, signaling can be one or a combination of two or more of higher-layer signaling, MAC signaling, and physical (PHY) signaling. Signaling can refer to the operation of a first communication node transmitting information (e.g., control information, configuration information, information elements) to a second communication node. When the first communication node is a base station, the second communication node can be a transmitting terminal and / or a receiving terminal. When the first communication node is a terminal, the second communication node can be a base station. When the first communication node is a transmitting node, the second communication node can be a receiving node. When the first communication node is a receiving node, the second communication node can be a transmitting node. The transmitting terminal can be a terminal that transmits data, and the receiving terminal can be a terminal that receives data.

[0093] Messages used for higher-layer signaling can be referred to as "high-layer messages" or "high-layer signaling messages." Messages used for MAC signaling can be referred to as "MAC messages" or "MAC signaling messages." Messages used for PHY signaling can be referred to as "PHY messages" or "PHY signaling messages." Higher-layer signaling can refer to the operation of sending and receiving system information (e.g., master information block (MIB), system information block (SIB)) and / or RRC messages. MAC signaling can refer to the operation of sending and receiving MAC control elements (CE). PHY signaling can refer to the operation of sending and receiving control information (e.g., downlink control information (DCI), uplink control information (UCI), or SCI).

[0094] Sidelink signals can be synchronization signals and reference signals used for sidelink communication. For example, synchronization signals can be synchronization signal / physical broadcast channel (SS / PBCH) blocks, sidelink synchronization signals (SLSS), primary sidelink synchronization signals (PSSS), secondary sidelink synchronization signals (SSSS), etc. Reference signals can be channel state information reference signals (CSI-RS), DM-RS, phase tracking reference signals (PT-RS), cell specific reference signals (CRS), sounding reference signals (SRS), discovery reference signals (DRS), etc.

[0095] Sidelink channels can be PSSCH, PSCCH, PSDCH, PSBCH, physical sidelink feedback channel (PSFCH), etc. Additionally, a sidelink channel can refer to a sidelink channel that includes sidelink signals mapped to specific resources within the corresponding sidelink channel. Sidelink communication can support broadcast, multicast, and unicast services.

[0096] Sidelink communication can be performed using either a single SCI scheme or a multi-SCI scheme. When using a single SCI scheme, data transmission (e.g., sidelink data transmission, sidelink-shared channel (SL-SCH) transmission) can be performed based on one SCI (e.g., a Phase 1 SCI). When using a multi-SCI scheme, two SCIs (e.g., a Phase 1 SCI and a Phase 2 SCI) can be used to perform data transmission. SCIs can be transmitted on the PSCCH and / or PSSCH. When using a single SCI scheme, an SCI (e.g., a Phase 1 SCI) can be transmitted on the PSCCH. When using a multi-SCI scheme, a Phase 1 SCI can be transmitted on the PSCCH, and a Phase 2 SCI can be transmitted on either the PSCCH or PSSCH. The Phase 1 SCI can be referred to as the "Phase 1 SCI," and the Phase 2 SCI can be referred to as the "Phase 2 SCI."

[0097] The Phase 1 SCI may include one or more of the following information elements: priority information, frequency resource assignment information, time resource allocation information, resource reservation period information, demodulation reference signal (DMRS) mode information, Phase 2 SCI format information, beta_offset indicator, number of DMRS ports, and modulation and coding scheme (MCS) information. The Phase 2 SCI may include one or more of the following information elements: HARQ processor identifier (ID), redundancy version (RV), source ID, target ID, CSI request information, area ID, and communication range requirements.

[0098] Figure 7 This is a conceptual diagram illustrating a first exemplary embodiment of a method for allocating sidelink resources.

[0099] like Figure 7 As shown, a resource pool can be configured for sidelink communication. A resource pool can be configured with one or more time slots, one or more micro-time slots, or one or more symbols in the time domain. The number of symbols constituting a micro-time slot can be less than the number of symbols constituting a time slot. A resource pool can include one or more sets of resource blocks (RBs), one or more physical resource blocks (PRBs), or one or more subcarriers in the frequency domain. An RB set can be referred to as a "subchannel." An RB set can include one or more subcarriers or one or more PRBs. A single subchannel can be a combination of a time resource region and a frequency resource region. A frequency resource region can be configured on a subchannel basis, and a subchannel can be used as a frequency resource region. In an exemplary embodiment, a PRB can be interpreted as a common resource block (CRB) or a virtual resource block (VRB). A resource pool can be interpreted as a logical resource. A resource pool can be a discontinuous time and frequency resource.

[0100] PSCCH and PSSCH can be allocated within a resource pool. In the frequency domain, PSCCH and PSSCH can belong to the same RB set (i.e., the same RB set). PSCCH and PSSCH configured within an RB set (i.e., the same RB set) can be referred to as "single RB set channels". Control information (e.g., SCI, first-stage SCI) can be transmitted on PSCCHs (e.g., candidate PSCCHs) within a PSCCH monitoring time (e.g., search space). PSCCH monitoring time can be configured within an RB set.

[0101] Information elements indicating whether a single RB set channel is used can be transmitted through one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling. For example, an information element set to a first value can indicate that a single RB set channel is used. An information element set to a second value can indicate that a single RB set channel is not used. In this case, PSCCH and / or PSSCH can be configured in multiple RB sets. Alternatively, PSCCH and PSSCH can be configured in different RB sets.

[0102] When using the sidelink TM#2, instead of the base station, the terminal can select radio resources (e.g., time and / or frequency resources) by performing sensing operations and perform sidelink communication using the selected radio resources. The transmission scheme for a single RB set channel for allocating resources (e.g., resource reservation) for initial data transmission and / or retransmission can be defined as shown in Table 3 below.

[0103] [Table 3]

[0104]

[0105] Scheme #3 can be a combination of Scheme #1 and Scheme #2. Terminals can use either Scheme #1 or Scheme #2 as needed. To support the schemes defined in Table 3, a single RB set channel can be configured within a resource pool configured for each terminal (e.g., transmitting terminal and / or receiving terminal).

[0106] Figure 8 This is a conceptual diagram illustrating a second exemplary embodiment of a method for allocating sidelink resources.

[0107] like Figure 8As shown, a single RB set channel #1 may include PSCCH #1 and PSSCH #1, and can be configured within a single RB set channel monitoring time. Single RB set channel #1 can be used to allocate (e.g., reserve) resources (e.g., PSCCH #2 resources and / or PSSCH #2 resources) for the next sidelink communication. A single RB set channel monitoring time can consist of one or more time slots or one or more micro-time slots in the time domain. A single RB set channel monitoring time can consist of one or more RB sets or one or more PRBs in the frequency domain. One or more single RB set channels can be transmitted within a single RB set channel monitoring time.

[0108] Configuration information for single RB aggregate channel monitoring timing can be transmitted through one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling. Single RB aggregate channel monitoring timing can be configured through one or more combinations of resource pool-specific signaling, sidelink-specific signaling, and UE-specific signaling.

[0109] The monitoring timing for a single RB set channel can be configured for each resource pool as shown in Table 4 below. The configuration information for the single RB set channel monitoring timing (e.g., resource information) can be included in the configuration information of the corresponding resource pool. Each of frequency regions #0 to #2 can indicate the frequency domain resources of the single RB set channel configured within the corresponding resource pool. Each of time regions #0 to #2 can indicate the time domain resources of the single RB set channel configured within the corresponding resource pool.

[0110] [Table 4]

[0111] Resource area for single RB set channel monitoring Resource Pool #1 Frequency region #0, Time region #0 Resource Pool #2 Frequency region #1, Time region #0 Resource Pool #3 Frequency region #2, Time region #1 Resource Pool #4 Frequency region #0, Time region #2

[0112] The frequency regions defined in Table 4 can be part or all of the frequency domain resources of the corresponding resource pool. A frequency region may include more than one subcarrier or more than one PRB. A frequency region may indicate all or the starting point (e.g., the starting PRB) of the frequency domain resources for the corresponding single RB set channel monitoring timing. The information indicating the frequency region may be one or more combinations of the starting PRB index, the ending PRB index, and the number of PRBs for the corresponding single RB set channel monitoring timing.

[0113] Each of time zones #0 to #2 may be part or all of the time-domain resources of the corresponding resource pool. Each of time zones #0 to #2 may include more than one symbol, more than one micro-slot, or more than one time slot. The time zone may indicate all or the start point of the time-domain resources for the corresponding single RB set channel monitoring timing (e.g., start symbol, start micro-slot, or start time slot). The information indicating the time zone may be one or more of the following: start symbol index, end symbol index, start micro-slot index, end micro-slot index, start time slot index, end time slot index, number of symbols, number of micro-slots, and number of time slots for the corresponding single RB set channel monitoring timing.

[0114] The broadcast (cast) scheme for monitoring the single RB set channel can be configured. Broadcast schemes can be categorized into broadcast, multicast, unicast, and broadcast schemes. For example, the monitoring timing of a single RB set channel using a specific broadcast scheme can be defined as shown in Table 5 below.

[0115] [Table 5]

[0116] Resource area for single RB set channel monitoring broadcast Frequency region #0, Time region #0 multicast Frequency region #1, Time region #0 unicast Frequency region #2, Time region #1

[0117] The broadcast scheme applied to the single-RB aggregate channel monitoring timing can be determined based on the characteristics of the transmission environment. The resource areas configured for single-RB aggregate channel monitoring timing for each broadcast scheme can overlap. Alternatively, the resource areas configured for single-RB aggregate channel monitoring timing for each broadcast scheme can be orthogonal. The broadcast scheme can be configured independently for each resource pool. That is, the broadcast scheme can be configured through resource pool-specific signaling. Alternatively, the broadcast scheme can be configured through sidelink-specific signaling within the resource pool.

[0118] The information defined in Tables 4 and / or 5 can be configured using one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling. The information defined in Table 4 can be configured for the transmitting terminal, which can then notify the receiving terminal of this information using MAC signaling and / or PHY signaling (e.g., PSCCH and / or PSSCH). In this case, the receiving terminal can expect to receive a single RB set channel within the resource area indicated by the transmitting terminal.

[0119] On the other hand, the timing of single-RB set channel monitoring can be configured based on Table 6 below instead of Tables 4 and 5. The configuration information for single-RB set channel monitoring timing defined in Table 6 can be transmitted through one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling. For example, the tables defined in Table 6 below can be pre-configured, and information elements indicating a single-RB set channel monitoring timing can be transmitted. In this case, the resource pool associated with the corresponding information element, the resource area of ​​the single-RB set channel monitoring timing, and / or the broadcast scheme can be used.

[0120] [Table 6]

[0121]

[0122] Figure 9 This is a conceptual diagram illustrating a third exemplary embodiment of a method for allocating sidelink resources.

[0123] like Figure 9 As shown, single-RB set channel monitoring timings can be configured within a resource pool, and these timings can be divided into multiple resource regions. More than one resource region can be configured using a single resource mode. Configuration information (e.g., index, time resource information, and / or frequency resource information) constituting the single-RB set channel monitoring timing can be transmitted via one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling.

[0124] For example, when a single RB set channel monitoring event includes four resource modes (e.g., resource modes #1 to #4), the index of each of the four resource modes can be defined as shown in Table 7 below. The index of one or more resource modes used for transmitting the single RB set channel can be transmitted through one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling. The index of one or more resource modes can be transmitted from the base station to the transmitting terminal and / or the receiving terminal. Alternatively, the index of one or more resource modes can be transmitted from the transmitting terminal to the receiving terminal. In this case, the transmitting terminal can transmit the index of the resource modes to the receiving terminal using PSCCH, PSSCH, and / or MAC CE. Therefore, the receiving terminal can expect to receive the single RB set channel in the resource mode indicated by the transmitting terminal (or base station).

[0125] [Table 7]

[0126] Indicators (e.g., indexes) Resource Mode #1 00 Resource Mode #2 01 Resource Mode #3 10 Resource Mode #4 11

[0127] On the other hand, a single RB set channel can be transmitted based on scheme #1, scheme #2, scheme #3, or scheme #4 defined in Table 3. The first-stage SCI may include information elements indicating more than one SL resource area. The maximum number of SL resource areas that can be reserved (e.g., allocated) for a single SCI can be preset by scheduling a transport block (TB) for transmission. Alternatively, the maximum number of SL resource areas that can be reserved for a single SCI can be set by one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling.

[0128] The maximum number of SL resource areas that can be reserved in an SCI can be set via resource pool-specific signaling. In this case, the maximum number of SL resource areas can be set to a specific value for each resource pool. When resource pools are classified as shown in Table 8 below, the maximum number of SL resource areas can be set for each resource pool. Here, resource pools #1 to #4 can have different sizes. For example, the time resources and / or frequency resources that constitute resource pools #1 to #4 can be different from each other.

[0129] [Table 8]

[0130] The maximum number of SL resource regions that can be reserved in an SCI Resource Pool #1 4 Resource Pool #2 3 Resource Pool #3 2 Resource Pool #4 1

[0131] When using scheme #1, the first-stage SCI may include resource information for sending and receiving the second-stage SCI, resource information for sending and receiving data (e.g., sidelink data), and / or information for decoding the second-stage SCI, and the second-stage SCI may include information for decoding the data. When using scheme #2, the first-stage SCI may include resource information for sending / receiving the second-stage SCI and / or information for decoding the second-stage SCI. In scheme #2, since data is not transmitted on the PSSCH where the second-stage SCI resides, the first-stage SCI may not include resource information for sending / receiving data, and the second-stage SCI may not include information for decoding data.

[0132] The SL resource regions can be defined as shown in Table 9 below. The transmission resources of SL channel #0 may include frequency region #0 and time region #0, the transmission resources of SL channel #1 may include frequency region #1 and time region #1, and the transmission resources of SL channel #2 may include frequency region #2 and time region #2.

[0133] [Table 9]

[0134]

[0135] When the number of SL resource areas (e.g., SL channels) that can be reserved for an SCI is 3, the first-stage SCI (e.g., the payload of the first-stage SCI) may include information elements indicating the time and frequency regions defined in Table 9. SL channel #0 may be a single-RB set channel. The first-stage SCI transmitted on PSCCH #0 may include resource information (e.g., frequency region #0 and time region #0) of the second-stage SCI and data transmitted on PSCCH #0. The combination of frequency region #0 and time region #0 can indicate a specific resource region.

[0136] Furthermore, the combination of frequency region #1 and time region #1 associated with SL channel #1 can indicate a specific resource region, and the combination of frequency region #2 and time region #2 associated with SL channel #2 can also indicate a specific resource region. Here, frequency resources can be indicated by the subcarrier index, the number of subcarriers, the PRB index, the number of PRBs, the RB set index, the number of RB sets, the resource element (RE) index, and / or the number of REs. Time resources can be indicated by the symbol index, the number of symbols, the microslot index, the number of microslots, the slot index, the number of slots, the subframe index, the number of subframes, the RE index, and / or the number of REs. The entire resource region can be indicated by a combination of the above parameters.

[0137] For example, a time zone can be indicated by a start symbol index and an end symbol index. Alternatively, a time zone can be indicated by a start symbol index and the number of symbols constituting the time zone. When time zones are allocated in units of time slots, a time zone can be indicated by a start time slot index and an end time slot index. Alternatively, a time zone can be indicated by a start time slot index and the number of time slots constituting the time zone.

[0138] Frequency regions can be indicated by a start subcarrier index and an end subcarrier index. Alternatively, a frequency region can be indicated by a start subcarrier index and the number of subcarriers constituting the frequency region. When frequency regions are allocated in units of PRBs, they can be indicated by a start PRB index and an end PRB index. Alternatively, they can be indicated by a start PRB index and the number of PRBs constituting the frequency region. When frequency regions are allocated in units of RB sets, they can be indicated by a start RB set index and an end RB set index. Alternatively, they can be indicated by a start RB set index and the number of RB sets constituting the frequency region. Various schemes other than those described above can be used to indicate each of the time and frequency regions.

[0139] When SL channels #1 and / or SL channels #2 as defined in Table 9 are used for retransmission, SL channels #1 and / or SL channels #2 can be located after SL channel #0. In this case, the time zone #1 of SL channel #1 can be indicated by the time zone #0 indicated by SL channel #0 and the time offset. Similarly, the time zone #2 of SL channel #2 can be indicated by the time zone #0 indicated by SL channel #0 and the time offset. For example, SL channel #1 can be located i timeslots after the end time (or start time) of time zone #0. Additionally, SL channel #2 can be located p timeslots after the end time (or start time) of either time zone #0 or time zone #1. That is, each of i and p can be a time offset. Each of i and p can be a natural number. The time offset can be set by one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling.

[0140] Figure 10 This is a sequence diagram illustrating a first exemplary embodiment of a sidelink communication method.

[0141] like Figure 10 As shown, sidelink communication between the sending terminal and the receiving terminal can be performed. The sending terminal can be... Figure 2 The UE#5 235 shown can be received by the receiving terminal. Figure 2 The UE#6236 shown is an example. Each of the transmitting and receiving terminals can communicate with... Figure 3 The communication nodes 300 shown are configured identically or similarly. Each of the sending and receiving terminals can support... Figures 4 to 6 The protocol stack shown.

[0142] Communication between the transmitting and receiving terminals can be performed using a single RB set channel. The transmitting terminal can generate a first-stage SCI (S1001). The first-stage SCI may include resource area information for SL channel #0, SL channel #1, and SL channel #2 as defined in Table 9. Furthermore, the first-stage SCI may include an allocation indicator. An allocation indicator set to a first value (e.g., 0) may indicate that the second-stage SCI associated with the first-stage SCI does not include resource area information (e.g., resource allocation information or resource reservation information). That is, an allocation indicator set to a first value may indicate that resource area information for all SL channels is included in the first-stage SCI.

[0143] An allocation indicator set to a second value (e.g., 1) can indicate that the second-stage SCI associated with the first-stage SCI includes resource area information (e.g., resource allocation information or resource reservation information). That is, an allocation indicator set to a second value can indicate that resource area information for all SL channels other than the SL channel transmitting the first-stage SCI including the allocation indicator (e.g., SL channel #0) is included in the second-stage SCI. When the allocation indicator is set to a second value, the receiving terminal can decode up to the second-stage SCI for resource sensing. The first-stage SCI generated in step S1001 may not include an allocation indicator. In this case (i.e., when the first-stage SCI received from the transmitting terminal does not include an allocation indicator), the receiving terminal can perform a monitoring operation to obtain the second-stage SCI. Alternatively, the first-stage SCI generated in step S1001 may include an allocation indicator set to a first value.

[0144] The transmitting terminal may transmit the first-stage SCI on PSCCH#0 (e.g., PSCCH#0 belonging to SL channel#0) (S1002). The receiving terminal may receive the first-stage SCI from the transmitting terminal by performing a monitoring operation on PSCCH#0 (e.g., during single-RB set channel monitoring). The receiving terminal may identify the resource area information of SL channel#0, SL channel#1, and SL channel#2 included in the first-stage SCI (S1003). Sidelink communication between the transmitting and receiving terminals may be performed using the resource areas indicated by the first-stage SCI (S1004). Performing sidelink communication in step S1004 may represent performing operations required for data transmission / reception and / or data transmission / reception operations.

[0145] Figure 11 This is a sequence diagram illustrating a second exemplary embodiment of the sidelink communication method.

[0146] like Figure 11 As shown, sidelink communication between the sending terminal and the receiving terminal can be performed. The sending terminal can be... Figure 2 The UE#5 235 shown can be received by the receiving terminal. Figure 2 The UE#6 236 shown. Each of the transmitting and receiving terminals can communicate with... Figure 3 The communication nodes 300 shown are configured identically or similarly. Each of the sending and receiving terminals can support... Figures 4 to 6 The protocol stack shown.

[0147] Communication between the transmitting and receiving terminals can be performed using a single RB set channel. The transmitting terminal can generate a first-stage SCI (S1101). The first-stage SCI may include resource allocation information (e.g., resource area information) and an allocation indicator. The first-stage SCI may include resource area information of the SL channel #0 to which the PSCCH#0 transmitting the first-stage SCI belongs. The allocation indicator may indicate that the second-stage SCI associated with the first-stage SCI includes resource allocation information. That is, the allocation indicator may be set to a second value.

[0148] The transmitting terminal may transmit the first-stage SCI on PSCCH#0 (e.g., PSCCH#0 belonging to SL channel#0) (S1102). The receiving terminal may receive the first-stage SCI from the transmitting terminal by performing a monitoring operation on PSCCH#0 (e.g., during single-RB set channel monitoring). The receiving terminal may identify the resource area information and allocation indicator of SL channel#0 included in the first-stage SCI (S1103). When the allocation indicator is set to a second value, the receiving terminal may determine that the second-stage SCI associated with the first-stage SCI includes resource area information of the remaining SL channels other than SL channel#0.

[0149] On the other hand, the transmitting terminal can generate a second-stage SCI including resource area information for SL channel #1 and resource area information for SL channel #2 (S1104). The transmitting terminal can transmit the second-stage SCI on PSSCH #0 (e.g., PSSCH #0 belonging to SL channel #0) (S1105). The receiving terminal can receive the second-stage SCI from the transmitting terminal by performing a monitoring operation on PSSCH #0 (e.g., during single RB set channel monitoring). The receiving terminal can identify the resource area information for SL channel #1 and SL channel #2 included in the second-stage SCI (S1106). Sidelink communication between the transmitting terminal and the receiving terminal can be performed using the resource areas indicated by the first-stage SCI and / or the second-stage SCI (S1107). Performing sidelink communication in step S1107 can represent performing operations required for data transmission / reception and / or data transmission / reception operations.

[0150] Figure 12 This is a sequence diagram illustrating a third exemplary embodiment of the sidelink communication method.

[0151] like Figure 12 As shown, sidelink communication between the sending terminal and the receiving terminal can be performed. The sending terminal can be... Figure 2 The UE#5 235 shown can be received by the receiving terminal. Figure 2 The UE#6 236 shown. Each of the transmitting and receiving terminals can communicate with... Figure 3 The communication nodes 300 shown are configured identically or similarly. Each of the sending and receiving terminals can support... Figures 4 to 6 The protocol stack shown.

[0152] Communication between the transmitting terminal and the receiving terminal can be performed using a single RB set channel. The transmitting terminal can generate a first-stage SCI (S1201). The first-stage SCI can include resource area information of n SL channels. The n SL channels can include the SL channel to which the PSCCH transmitting the first-stage SCI belongs (e.g., SL channel #0) and (n-1) SL channels following SL channel #0.

[0153] In the time domain, SL channel #1 can be located after SL channel #0, SL channel #2 can be located after SL channel #1, and SL channel #3 can be located after SL channel #2. SL channel #1 can be the earliest SL channel in time among the SL channels located after SL channel #0, SL channel #2 can be the earliest SL channel in time among the SL channels located after SL channel #1, and SL channel #3 can be the earliest SL channel in time among the SL channels located after SL channel #2.

[0154] When n is 2, the first-stage SCI can include resource area information for SL channel #0 and SL channel #1. When n is 3, the first-stage SCI can include resource area information for SL channel #0, SL channel #1, and SL channel #2. n can be set by one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling.

[0155] exist Figure 12 In the exemplary embodiment shown, n is assumed to be 2. The transmitting terminal may transmit a first-stage SCI (S1202) on PSCCH#0 (e.g., PSCCH#0 belonging to SL channel#0). The receiving terminal may receive the first-stage SCI from the transmitting terminal by performing a monitoring operation on PSCCH#0 (e.g., during single RB set channel monitoring). The receiving terminal may identify the resource area information of SL channel#0 and SL channel#1 included in the first-stage SCI (S1203).

[0156] On the other hand, the transmitting terminal can generate a second-stage SCI (S1204) that includes resource area information for the remaining SL channels (e.g., SL channel #2). The transmitting terminal can transmit the second-stage SCI on PSSCH #0 (e.g., PSSCH #0 belonging to SL channel #0) (S1205). The maximum number of SL channels that can be allocated (e.g., reserved) for the SCI (e.g., the first-stage SCI and the second-stage SCI) can be preset (hereinafter referred to as "m"). m can be set by one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling. In this case, the second-stage SCI can include resource area information for (mn) SL channels. (mn) can be set by one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling.

[0157] The receiving terminal can receive the second-stage SCI from the transmitting terminal by performing a monitoring operation on PSSCH#0 (e.g., a single RB set channel monitoring timing). The receiving terminal can identify resource area information of SL channel #2 included in the second-stage SCI (S1206). Sidelink communication between the transmitting and receiving terminals can be performed using the resource areas indicated by the first-stage SCI and / or the second-stage SCI (S1207). Performing sidelink communication in step S1207 can represent performing operations required for data transmission / reception and / or data transmission / reception operations.

[0158] On the other hand, Figure 12 Following step S1206, the transmitting terminal can reserve additional resources to perform sidelink communication using SL channel #1. The process for reserving additional resources can be as follows: Figure 13 Execute as shown.

[0159] Figure 13 This is a sequence diagram illustrating a fourth exemplary embodiment of the sidelink communication method.

[0160] like Figure 13 As shown, when n is 2, the transmitting terminal can generate a first-stage SCI including resource area information of SL channel #1 and resource area information of SL channel #2 (S1301). The transmitting terminal can transmit the first-stage SCI on PSCCH #1 (e.g., PSCCH #1 belonging to SL channel #1) (S1302). The receiving terminal can receive the first-stage SCI from the transmitting terminal by performing a monitoring operation on PSCCH #1 (e.g., during single RB set channel monitoring). The receiving terminal can identify the resource area information of SL channel #1 and resource area information of SL channel #2 included in the first-stage SCI (S1303).

[0161] The transmitting terminal can generate a second-stage SCI (S1304) that includes resource area information for the remaining SL channels (e.g., SL channel #3). The transmitting terminal can transmit the second-stage SCI on PSSCH #1 (e.g., PSSCH #1 belonging to SL channel #1) (S1305). When m is 3, the second-stage SCI can include resource area information for one SL channel (e.g., (3-2) SL channels).

[0162] The receiving terminal can receive the second-stage SCI from the transmitting terminal by performing a monitoring operation on PSSCH#1 (e.g., a single RB set channel monitoring timing). The receiving terminal can identify the resource area information of SL channel #3 included in the second-stage SCI (S1306). Sidelink communication between the transmitting and receiving terminals can be performed using the resource areas indicated by the first-stage SCI and / or the second-stage SCI (S1307).

[0163] On the other hand, when using Figure 12 and / or Figure 13 In the exemplary embodiment shown, resources (e.g., resource areas) can be reserved one by one according to a chain rule based on the first-stage SCI. The receiving terminal can identify resource allocation information (e.g., resource reservation information) by receiving consecutive first-stage SCIs without a second-stage SCI. When it is desired to know the resource area information of all allocated (e.g., reserved) SL channels, the receiving terminal can obtain the corresponding resource information by decoding not only the first-stage SCI but also the second-stage SCI. Figure 12 and / or Figure 13 In the exemplary embodiment shown, each of n and m can be set to various values. The first-stage SCI can include not only resource area information of the SL channel, but may further include an allocation indicator. The allocation indicator can indicate whether the second-stage SCI includes resource area information of the SL channel.

[0164] On the other hand, when using scheme #3 as defined in Table 3, scheme #1 or scheme #2 can be selected depending on the situation. For example, when the size of the data to be transmitted is small (e.g., when the data size is less than or equal to a threshold), scheme #1 can be used. In this case, the data can be transmitted through a single RB set channel. When the size of the data to be transmitted is large (e.g., when the data size exceeds a threshold), scheme #2 can be used. In this case, the data transmission resources can be reserved using a single RB set channel, and the data can be transmitted using the reserved resources.

[0165] Here, the threshold can be X bytes. The threshold (e.g., X) can be set by one or more combinations of higher-layer signaling, MAC signaling, and PHY signaling. The first-stage SCI may include a scheme indicator indicating the scheme to be used. The scheme indicator may indicate scheme #1 or scheme #2 as defined in Table 3. As another example, the scheme indicator may indicate scheme #1, scheme #2, or scheme #3 as defined in Table 3. As another example, the scheme indicator may indicate scheme #1, scheme #2, scheme #3, or scheme #4 as defined in Table 3. To express the scheme indicator, fields included in the first-stage SCI (e.g., fields providing additional information) may be reused. The scheme indicator may be explicitly or implicitly indicated by the first-stage SCI.

[0166] The methods according to this disclosure can be implemented as program instructions executable by various computer devices and can be recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or combinations thereof. The program instructions recorded on the computer-readable medium may be specifically designed and configured for this disclosure, or may be well known and available to those skilled in the art of computer software.

[0167] Examples of computer-readable media may include hardware devices such as ROM, RAM, and flash memory that are specifically configured to store and execute program instructions. Examples of program instructions include, for example, machine code generated by a compiler and high-level language code executable by a computer using an interpreter. The aforementioned exemplary hardware devices may be configured to operate as at least one software module to perform the operations of this disclosure, and vice versa.

[0168] Although exemplary embodiments of this disclosure have been described in detail, those skilled in the art will understand that various changes and modifications can be made to this disclosure without departing from the spirit and field of this disclosure as set forth in the claims.

Claims

1. A method for a first user equipment, i.e., a method for a first UE, comprising: Generate the first-stage sidelink control information, i.e., the first-stage SCI. The first-stage SCI includes first resource allocation information and a first indicator indicating whether the second-stage SCI includes second resource allocation information. The first phase SCI is transmitted to the second UE on the physical side link control channel, i.e., PSCCH. Transmit the second-stage SCI associated with the first-stage SCI; as well as Sidelink communication with the second UE is performed by utilizing a first resource area indicated by the first resource allocation information. The second resource allocation information included in the second stage SCI indicates a second resource region, which is different from the first resource region, and each of the first resource region and the second resource region is used for transmitting and receiving side link data.

2. The method according to claim 1, wherein, The first phase SCI further includes a second indicator indicating the usage scheme of the side link channel. The second indicator set to a first value indicates that the PSCCH is used to transmit the first phase SCI and the physical side link shared channel, i.e., the PSSCH, is used to transmit the second phase SCI and the side link data. The second indicator set to a second value indicates that the PSCCH is used to transmit the first phase SCI and the PSSCH is used to transmit the second phase SCI.

3. The method according to claim 1, wherein, The usage schemes of the sidelink channel, including the PSCCH and the physical sidelink shared channel (PSSCH), are classified into a first scheme and a second scheme. When using the first scheme, the PSCCH is used to transmit the first-stage SCI, and the PSSCH is used to transmit the second-stage SCI and the sidelink data. When using the second scheme, the PSCCH is used to transmit the first-stage SCI, and the PSSCH is used to transmit the second-stage SCI. The first scheme is used when the size of the side link data is less than or equal to the threshold, and the second scheme is used when the size of the side link data exceeds the threshold.

4. The method according to claim 1, wherein, The first resource allocation information indicates the resource areas of n sidelink channels, i.e., SL channels, and the second resource allocation information indicates the resource areas of k SL channels. Each of the n SL channels and the k SL channels includes a PSCCH and a physical sidelink shared channel, i.e., PSSCH, belonging to the same resource block set, i.e., RB set, and each of n and k is a natural number.

5. The method according to claim 4, wherein, One of n, k, and (n+k) is obtained from the base station through one or more of higher-layer signaling, media access control signaling (MAC signaling), and physical signaling (PHY signaling).

6. The method according to claim 1, wherein, The side link channel, including the PSCCH and the physical side link shared channel (PSSCH), is transmitted during the monitoring period, which is configured for a specific broadcast scheme, and the specific broadcast scheme is one of unicast, multicast, and broadcast schemes.

7. A method for a second user equipment, i.e., a method for a second UE, comprising: The first phase side link control information, i.e., the first phase SCI, is received from the first UE on the physical side link control channel, i.e., PSCCH. Identify the first resource allocation information and the first indicator indicating whether the second stage SCI includes the second resource allocation information, wherein the first resource allocation information and the first indicator are included in the first stage SCI; as well as Perform monitoring operations on the Physical Side Link Shared Channel (PSSCH) to receive the second-stage SCI from the first UE. Wherein, the first indicator indicates that the second stage SCI includes the second resource allocation information, the first resource allocation information included in the first stage SCI indicates a first resource area, the second resource allocation information included in the second stage SCI indicates a second resource area, the second resource area is different from the first resource area, and each of the first resource area and the second resource area is used for transmitting and receiving sidelink data.

8. The method according to claim 7, wherein, The first resource allocation information indicates the resource areas of n sidelink channels, i.e., SL channels, and the second resource allocation information indicates the resource areas of k SL channels. Each of the n SL channels and the k SL channels includes a PSCCH and a PSSCH belonging to the same resource block set, i.e., RB set, and each of n and k is a natural number.

9. The method according to claim 8, wherein, One of n, k, and (n+k) is obtained from the base station through one or more of higher-layer signaling, media access control signaling (MAC signaling), and physical signaling (PHY signaling).

10. The method according to claim 7, wherein, The sidelink channel, including the PSCCH and the PSSCH, is received during a monitoring period configured for a specific broadcast scheme, which is one of a unicast scheme, a multicast scheme, and a broadcast scheme.

11. The method according to claim 7, wherein, The first phase SCI further includes a second indicator indicating the usage scheme of the side link channel. The second indicator set to a first value indicates that the PSCCH is used to transmit the first phase SCI and the PSSCH is used to transmit the second phase SCI and the side link data. The second indicator set to a second value indicates that the PSCCH is used to transmit the first phase SCI and the PSSCH is used to transmit the second phase SCI.

12. The method according to claim 7, wherein, The usage schemes of the side link channels, including the PSCCH and PSSCH, are classified into a first scheme and a second scheme. When using the first scheme, the PSCCH is used to transmit the first-stage SCI, and the PSSCH is used to transmit the second-stage SCI and the sidelink data. When using the second scheme, the PSCCH is used to transmit the first-stage SCI, and the PSSCH is used to transmit the second-stage SCI. The first scheme is used when the size of the side link data is less than or equal to the threshold, and the second scheme is used when the size of the side link data exceeds the threshold.

13. The method according to claim 12, wherein, The threshold is obtained from the base station through one or more of higher-layer signaling, media access control signaling (MAC signaling), and physical signaling (PHY signaling).

14. A first user equipment, i.e., a first UE, comprising: processor; as well as The memory stores at least one instruction executable by the processor. The at least one instruction causes the first UE to: Generate the first-stage sidelink control information, i.e., the first-stage SCI. The first-stage SCI includes first resource allocation information and a first indicator indicating whether the second-stage SCI includes second resource allocation information. The first phase SCI is transmitted to the second UE on the physical side link control channel, i.e., PSCCH. Transmit the second-stage SCI associated with the first-stage SCI; and Sidelink communication with the second UE is performed by utilizing a first resource area indicated by the first resource allocation information. The second resource allocation information included in the second stage SCI indicates a second resource region, which is different from the first resource region, and each of the first resource region and the second resource region is used for transmitting and receiving side link data.

15. The first UE according to claim 14, wherein, The first phase SCI further includes a second indicator indicating the usage scheme of the side link channel. The second indicator set to a first value indicates that the PSCCH is used to transmit the first phase SCI and the physical side link shared channel, i.e., the PSSCH, is used to transmit the second phase SCI and the side link data. The second indicator set to a second value indicates that the PSCCH is used to transmit the first phase SCI and the PSSCH is used to transmit the second phase SCI.

16. The first UE according to claim 14, wherein, The first resource allocation information indicates the resource areas of n sidelink channels, i.e., SL channels, and the second resource allocation information indicates the resource areas of k SL channels. Each of the n SL channels and the k SL channels includes a PSCCH and a physical sidelink shared channel, i.e., PSSCH, belonging to the same resource block set, i.e., RB set, and each of n and k is a natural number.

17. The first UE according to claim 14, wherein, The side link channel, including the PSCCH and the physical side link shared channel (PSSCH), is transmitted during the monitoring period, which is configured for a specific broadcast scheme, and the specific broadcast scheme is one of unicast, multicast, and broadcast schemes.

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