Method and apparatus for transmitting SCI in sidelink communication

Abstract

Disclosed are a method and apparatus for transmitting SCI in sidelink communication. An operation method of a transmitting terminal includes the steps of: receiving, from a base station, configuration information in which a SL subchannel size is set to be above a threshold, in order to save power of a receiving terminal; multiplexing a PSCCH with a first PSSCH DMRS in a frequency domain when the SL subchannel size is equal to or greater than the threshold; and mapping a second-stage SCI to a symbol in which the first PSSCH DMRS is located.

Description

Technical Field

[0001] This disclosure relates to a sidelink communication technology, and more specifically, to a sidelink control information (SCI) mapping technology for reducing power consumption during SCI reception. Background Technology

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

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

[0004] In cellular communication systems, V2X communication (e.g., C-V2X communication) can be performed based on sidelink communication technologies (e.g., proximity-based service (ProSe) communication, device-to-device (D2D) communication, etc.). For example, a sidelink channel can be established for vehicles participating in V2V communication (e.g., sidelink communication), and the sidelink channel can be used for communication between vehicles. Sidelink communication can be performed using configured grant (CG) resources. 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, a terminal can receive sidelink control information (SCI) for resource allocation from another terminal and can allocate resources based on the information elements included in the SCI. This SCI may include a first-stage SCI and / or a second-stage SCI. The symbols mapped to by the first-stage SCI within the physical resources may be the same as the symbols mapped to by the second-stage SCI. Alternatively, the first-stage SCI may be mapped first in the time domain, and the second-stage SCI may be mapped from symbols following the terminating symbol mapped to by the first-stage SCI.

[0006] Because the battery capacity of pedestrian-carried terminals (hereinafter referred to as "P terminals") is limited, power-saving operations are necessary for P terminals. In particular, when the second-stage SCI maps symbols after the terminal symbols mapped from the first-stage SCI, the power consumption of the P terminal may increase during the reception operations (e.g., decoding operations) of both the first and second-stage SCIs. Therefore, a method to address the aforementioned problem is needed. Summary of the Invention

[0007] Technical issues

[0008] To address the aforementioned issues, this disclosure aims to provide an SCI mapping method for reducing power consumption in a process that receives SCI.

[0009] Technical solution

[0010] According to a first exemplary embodiment of the present disclosure for achieving the above objectives, an operation method of a transmitting terminal may include: receiving configuration information from a base station for a sidelink (SL) subchannel size set to be equal to or greater than a threshold in order to save power of a receiving terminal; when the SL subchannel size is greater than or equal to the threshold, multiplexing the physical sidelink control channel (PSCCH) and the first physical sidelink shared channel (PSSCH) demodulation reference signal (DMRS) in the frequency domain; and mapping second-stage sidelink control information (SCI) to the symbol where the first PSSCH DMRS is located.

[0011] The threshold can be 20 physical resource blocks (PRBs), and the SL subchannel size can be greater than or equal to the PSCCH size.

[0012] The PSCCH size can be set below the maximum value to save power for the receiving terminal.

[0013] When the PSCCH size is set to be less than or equal to the maximum value, a new first-stage SCI that includes only specific information elements can be used.

[0014] The operation method of the aforementioned transmitting terminal may further include: receiving information from the base station that allows the use of the new first-stage SCI.

[0015] According to a second exemplary embodiment of the present disclosure for achieving the above objectives, an operation method of a transmitting terminal may include: receiving configuration information of the size of a sidelink (SL) subchannel and configuration information of the size of a physical sidelink control channel (PSCCH) from a base station; when the size of the SL subchannel is less than a threshold, multiplexing the PSCCH with a first physical sidelink shared channel (PSSCH) demodulation reference signal (DMRS) in the frequency domain, regardless of the PSCCH size; and mapping second-stage sidelink control information (SCI) to the symbol where the first PSSCH DMRS is located.

[0016] The operation method of the transmitting terminal may further include: receiving information from the base station that allows the PSCCH and the first PSSCH DMRS to be multiplexed in the frequency domain regardless of the PSCCH size when the SL subchannel size is less than a threshold.

[0017] The threshold can be 20 physical resource blocks (PRBs), and the SL subchannel can be larger than or equal to the PSCCH size.

[0018] The PSCCH size can be set below the maximum value to save power for the receiving terminal.

[0019] When the PSCCH size is set to be less than or equal to the maximum value, a new first-stage SCI consisting only of specific information elements can be used, and information allowing the use of the new first-stage SCI can be received from the base station.

[0020] According to a third exemplary embodiment of the present disclosure for achieving the above objectives, an operation method of a transmitting terminal may include: mapping a first-stage sidelink control information (SCI) to one or more symbols; mapping a second-stage SCI to a symbol preceding the symbol containing a first physical sidelink shared channel (PSSCH) demodulation reference signal (DMRS); and mapping the first PSSCH DMRS to a symbol following the second-stage SCI in the time domain, wherein the preceding symbol is included in one or more symbols.

[0021] The operation method of the transmitting terminal may further include: receiving information from the base station that allows the second-stage SCI to be mapped to the preceding region within the time slot regardless of the location of the first PSSCH DMRS.

[0022] Regardless of the location of the first PSSCH DMRS, the size of the side link (SL) subchannel, and the size of the physical side link control channel (PSCCH), the second-stage SCI is mapped to the front region within the time slot.

[0023] The operation method of the transmitting terminal may further include: receiving configuration information from the base station of the SL subchannel size, which is set below the maximum value to reduce the number of times blind detection is performed for the first-stage SCI.

[0024] Beneficial effects

[0025] According to this disclosure, the second-stage SCI can be mapped to the preceding region within a time slot. For example, the first-stage SCI and the second-stage SCI can be mapped to the same symbol. Therefore, the power consumption of the receiving terminal during the reception of SCIs (e.g., the first-stage SCI and / or the second-stage SCI) can be reduced. Additionally, to reduce the number of times physical sidechain control channel (PSCCH) blind detection is performed, the frequency domain size of the resource pool can be limited. In this case, the number of PSCCH blind detections performed by the receiving terminal can be reduced, thus reducing the power consumption of the receiving terminal. Attached Figure Description

[0026] Figure 1 This is a conceptual diagram illustrating a V2X communication scenario.

[0027] Figure 2 This is a conceptual diagram illustrating a first exemplary embodiment of a cellular communication system.

[0028] Figure 3This is a block diagram illustrating a first exemplary embodiment of a communication node constituting a cellular communication system.

[0029] Figure 4 This is a block diagram illustrating a first exemplary embodiment of the user plane protocol stack of a UE performing sidelink communication.

[0030] Figure 5 This is a block diagram illustrating a first exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication.

[0031] Figure 6 This is a block diagram illustrating a second exemplary embodiment of the control plane protocol stack of a UE performing sidelink communication.

[0032] Figure 7 This is a conceptual diagram illustrating a first exemplary embodiment of a physical resource to which sidelink channels and / or signals are mapped.

[0033] Figure 8 This is a conceptual diagram illustrating a second exemplary embodiment to which sidelink channels and / or signals are mapped. Detailed Implementation

[0034] Because this disclosure can be modified in various ways and has multiple forms, specific exemplary embodiments will be shown in the accompanying drawings and described in detail in the specific embodiments. However, it should be understood that this disclosure is not intended to be limited to the specific exemplary embodiments, but rather, this disclosure will cover all modifications, equivalents, and alternatives that fall within the spirit and scope of this disclosure.

[0035] Terms such as "first," "second," etc., may be used to describe various components, but these components are not limited by these terms. These terms are only used to distinguish one component from another. For example, without departing from the scope of this disclosure, a first component may be named a second component, and similarly, a second component may be named a first component. The term "and / or" refers to any one or a combination of a plurality of related and described items.

[0036] In exemplary embodiments of this disclosure, "at least one of A and B" may refer to "at least one of A or B" or "at least one of a combination of one or more of A and B". Additionally, "one or more of A and B" may refer to "one or more of A or B" or "one or more of a combination of one or more of A and B".

[0037] In exemplary embodiments of this disclosure, (re)transmit can mean “transmit,” “retransmit,” or “transmit and retransmit,” (re)configuration can mean “configure,” “reconfigure,” or “configure and reconfigure,” (re)connect can mean “connect,” “reconnect,” or “connect and reconnect,” and (re)link can mean “connect,” “reconnect,” or “connect and reconnect.”

[0038] When it is said that a component is "connected" or "linked" to another component, it should be understood that the component is directly "connected" or "linked" to the other component, or that another component may be placed in between. In contrast, when it is said that a component is "directly connected" or "directly linked" to another component, it should be understood that no other component is placed in between.

[0039] The terminology used in this disclosure is for describing specific exemplary embodiments only and is not intended to limit the disclosure. Unless the context clearly specifies otherwise, singular expressions include plural expressions. In this disclosure, terms such as “comprising” or “having” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but it should be understood that these terms do not preclude the possibility of the presence or addition of one or more features, numbers, steps, operations, components, parts, or combinations thereof.

[0040] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms as defined in commonly used dictionaries shall be interpreted as having a meaning that matches the meaning in the context of the relevant art. In this specification, unless explicitly defined, terms are not necessarily to be interpreted as having an ideal or overly formal meaning.

[0041] In the following description, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In order to facilitate a thorough understanding of the present disclosure, the same reference numerals will refer to the same components throughout the description of the drawings, and repeated descriptions of the same components will be omitted.

[0042] Figure 1 This is a conceptual diagram illustrating a V2X communication scenario.

[0043] like Figure 1As shown, V2X communication can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, etc. V2X communication can be supported by a cellular communication system (e.g., cellular communication network 140), and V2X communication supported by cellular communication system 140 can be referred to as "cellular-V2X (C-V2X) communication." Here, cellular communication system 140 can include 4G communication systems (e.g., LTE communication systems or LTE-A communication systems), 5G communication systems (e.g., NR communication systems), etc.

[0044] V2V communication can refer to communication between vehicle #1 100 (e.g., a communication node located in vehicle #1 100) and vehicle #2 110 (e.g., a communication node located in vehicle #1 100). Various driving information, such as speed, heading, time, and location, can be exchanged between vehicles 100 and 110 via V2V communication. Autonomous driving (e.g., platooning) can be supported based on the driving information exchanged via V2V communication. V2V communication supported in the cellular communication system 140 can be performed based on "sidelink" communication technologies (e.g., ProSe and D2D communication technologies). In this case, a sidelink channel can be used to perform communication between vehicles 100 and 110.

[0045] V2I communication can refer to communication between vehicle #1 100 and roadside infrastructure (e.g., roadside unit (RSU)) 120. Infrastructure 120 may include traffic lights or streetlights located on the roadside. For example, when performing V2I communication, communication can be performed between communication nodes located in vehicle #1 100 and communication nodes located in traffic lights. Traffic information, driving information, etc., can be exchanged between vehicle #1 100 and infrastructure 120 via V2I communication. V2I communication supported in cellular communication system 140 can also be performed based on sidelink communication technologies (e.g., ProSe communication technology and D2D communication technology). In this case, a sidelink channel can be used to perform communication between vehicle #1 100 and infrastructure 120.

[0046] 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, such as speed, direction, time, and position, can be exchanged between vehicle #1 100 and person 130 via V2P communication. The communication node located in vehicle #1 100 or the communication node carried by person 130 can determine dangerous situations based on the obtained driving and motion information, thereby generating a warning indicating danger. V2P communication supported in cellular communication system 140 can be performed based on sidelink communication technology (e.g., ProSe communication technology and D2D communication technology). In this case, a sidelink channel can be used to perform communication between the communication node located in vehicle #1 100 or the communication node carried by person 130.

[0047] V2N communication can refer to communication between vehicle #1 100 (e.g., a communication node located in vehicle #1 100) and cellular communication system 140 (e.g., a cellular communication network). V2N communication can be performed based on 4G communication technologies (e.g., LTE or LTE-A as specified in the 3GPP standard) or 5G communication technologies (e.g., NR as specified in the 3GPP standard). Furthermore, V2N communication can be performed based on communication technologies defined in IEEE 702.11 (e.g., Wireless Access in Vehicular Environments (WAVE) communication technology, Wireless Local Area Network (WLAN) communication technology, etc.) and communication technologies defined in IEEE 702.15 (e.g., Wireless Personal Area Network (WPAN) communication technology, etc.).

[0048] On the other hand, the cellular communication system 140 that supports V2X communication can be configured as follows.

[0049] Figure 2 This is a conceptual diagram illustrating a first exemplary embodiment of a cellular communication system.

[0050] like Figure 2 As shown, a cellular communication system may include an access network, a core network, etc. The access network may include base station 210, repeater 220, user equipment (UE) 231 to 236, etc. UE 231 to 236 may include components located at... Figure 1 The communication nodes in vehicles 100 and 110, located Figure 1 Communication nodes in infrastructure 120 Figure 1Personnel 130 carry communication nodes, etc. When the cellular communication system supports 4G communication technology, the core network may include a Serving Gateway (S-GW) 250, a Packet Data Network (PDN) Gateway (P-GW) 260, a Mobility Management Entity (MME) 270, etc.

[0051] When a cellular communication system supports 5G communication technology, the core network may include User Plane Function (UPF) 250, Session Management Function (SMF) 260, Access and Mobility Management Function (AMF) 270, etc. Alternatively, when the cellular communication system operates in Non-Stand Alone (NSA) mode, the core network consisting of S-GW 250, P-GW 260, and MME 270 can support both 4G and 5G communication technologies, while the core network consisting of UPF 250, SMF 260, and AMF 270 can support both 5G and 4G communication technologies.

[0052] 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.

[0053] Communication nodes constituting a cellular communication system (e.g., base stations, repeaters, UEs, S-GW, P-GW, MME, UPF, SMF, AMF, etc.) can perform communication by utilizing at least one of the following communication technologies: Code Division Multiple Access (CDMA), Wideband CDMA (WCDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiplexing (OFDM), Filtered OFDM, Single-Carrier FDMA (SC-FDMA), Non-Orthogonal Multiple Access (NOMA), Generalized Frequency Division Multiplexing (GFDM), and Filter Bank Multicarrier. Multi-Carrier (FBMC) technology, Universal Filtered Multi-Carrier (UFMC) technology, and Space Division Multiple Access (SDMA) technology.

[0054] 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.

[0055] Figure 3 This is a block diagram illustrating a first exemplary embodiment of a communication node constituting a cellular communication system.

[0056] like Figure 3 As shown, the communication node 300 may include at least one processor 310, a memory 320, and a transceiver 330 connected to a network to perform communication. Furthermore, the communication node 300 may further include an input interface device 340, an output interface device 350, a storage device 360, etc. Each component included in the communication node 300 can be connected and communicate with each other via a bus 370.

[0057] However, the components included in communication node 300 can be connected to processor 310 via separate interfaces or separate buses instead of the common bus 370. For example, processor 310 can be connected via dedicated interfaces to at least one of memory 320, transceiver 330, input interface device 340, output interface device 350, and storage device 360.

[0058] 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).

[0059] Refer again Figure 2 In the communication system, base station 210 can form a macro cell or a small cell, and can connect to the core network via ideal backhaul or non-ideal backhaul. Base station 210 can transmit signals received from the core network to UEs 231 to 236 and repeater 220, and can also transmit signals received from UEs 231 to 236 and repeater 220 to the core network. UEs #1 231, UE #2 232, UE #4 234, UE #5 235, and UE #6 236 can be within the cell coverage area of ​​base station 210. UEs #1 231, UE #2 232, UE #4 234, UE #5 235, and UE #6 236 can connect to base station 210 by performing a connection establishment procedure with 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.

[0060] Repeater 220 can be connected to base station 210 and can relay communication between base station 210 and UE#3 233 and UE#4 234. That is, repeater 220 can send signals received from base station 210 to UE#3 233 and UE#4 234, and can also send signals received from UE#3 233 and UE#4 234 to base station 210. UE#4 234 can be within the cell coverage area of ​​both base station 210 and repeater 220, while UE#3 233 can be within the cell coverage area of ​​repeater 220. That is, UE#3 233 can be located outside the cell coverage area of ​​base station 210. UE#3 233 and UE#4 234 can connect to repeater 220 by performing a connection establishment procedure. UE#3 233 and UE#4 234 can communicate with repeater 220 after connecting to it.

[0061] Base station 210 and repeater 220 can support multiple-input multiple-output (MIMO) technologies (e.g., single-user (SU)-MIMO, multi-user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) communication technologies, carrier aggregation (CA) communication technologies, unlicensed band communication technologies (e.g., licensed assisted access (LAA), enhanced LAA (eLAA), etc.), and sidelink communication technologies (e.g., ProSe communication technologies, D2D communication technologies). UE#1 231, UE#2 232, UE#5 235, and UE#6 236 can perform operations corresponding to base station 210 and operations supported by base station 210. UE#3 233 and UE#4 234 can perform operations corresponding to repeater 220 and operations supported by repeater 220.

[0062] Here, base station 210 can be referred to as Node B (NB), Evolved Node B (eNB), Base Transceiver Station (BTS), Radio Remote Head (RRH), Transmission Reception Point (TRP), Radio Unit (RU), Roadside Unit (RSU), Radio Transceiver, Access Point, Access Node, etc. Repeater 220 can be referred to as small base station, relay node, etc. Each of UE#1 231 to UE#6 236 can be referred to as terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, On-Broad Unit (OBU), etc.

[0063] On the other hand, communication between UE#5 235 and UE#6 236 can be performed based on sidelink communication technologies (e.g., ProSe communication technology, D2D communication technology). Sidelink communication can be performed based on a one-to-one scheme or a one-to-many scheme. When using sidelink communication technology to perform V2V communication, UE#5 235 can be located at... Figure 1 The communication node in vehicle #1 100, UE #6 236 can be located in Figure 1 The communication node in vehicle #2 110. When performing V2I communication using sidelink communication technology, UE #5 235 can be located in Figure 1 The communication node in vehicle #1 100, UE #6 236 can be located in Figure 1 The communication node in infrastructure 120. When performing V2P communication using sidelink communication technology, UE#5 235 can be located in Figure 1 The communication node in vehicle #1100, UE#6 236 can be Figure 1 The personnel numbered 130 and carried communication nodes.

[0064] Based on the location of the UEs participating in sidelink communication (e.g., UE#5 235 and UE#6 236), the application sidelink communication scenarios can be classified as shown in Table 1 below. For example, Figure 2 The sidelink communication scenario between UE#5 235 and UE#6 236 shown can be sidelink communication scenario #C.

[0065] [Table 1]

[0066] Side link communication scenarios Location of UE#5 235 Location of UE#6 236 #A Outside the coverage area of ​​base station 210 Outside the coverage area of ​​base station 210 #B Within the coverage area of ​​base station 210 Outside the coverage area of ​​base station 210 #C Within the coverage area of ​​base station 210 Within the coverage area of ​​base station 210 #D Within the coverage area of ​​base station 210 Within the coverage area of ​​base station 210

[0067] On the other hand, the user plane protocol stack of the UE performing sidelink communication (e.g., UE#5 235 and UE#6 236) can be configured as follows.

[0068] Figure 4 This is a block diagram illustrating a first exemplary embodiment of the user plane protocol stack of a UE performing sidelink communication.

[0069] like Figure 4 As shown, UE#5 235 can be Figure 2 The UE#5 235 and UE#6 236 shown can be Figure 2 The example shown is UE#6 236. The sidelink communication scenario between UE#5 235 and UE#6 236 can be one of the sidelink communication scenarios #A to #D in Table 1. The user plane protocol stack of each of UE#5 235 and UE#6 236 may include a Physical (PHY) layer, a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, and a Packet Data Convergence Protocol (PDCP) layer.

[0070] Sidelink communication between UE#5 235 and UE#6 236 can be performed using the PC5 interface (e.g., the PC5-U interface). Layer 2 identifiers (IDs) (e.g., source Layer 2 ID, destination Layer 2 ID) can be used for sidelink communication, and the Layer 2 ID can be an ID configured for V2X communication. Furthermore, hybrid Automatic Repeat Request (HARQ) feedback operations can be supported in sidelink communication, and RLC Acknowledged Mode (RLC AM) or RLC Unacknowledged Mode (RLC UM) can be supported.

[0071] 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.

[0072] 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.

[0073] like Figure 5 and Figure 6 As shown, UE#5 235 can be Figure 2The UE#5 235 and UE#6 shown can be Figure 2 The sidelink communication scenario between UE#6 236 and UE#5 235 can be one of the sidelink communication scenarios #A to #D in Table 1. Figure 5 The control plane protocol stack shown can be a control plane protocol stack used for sending and receiving broadcast information (e.g., Physical Sidelink Broadcast Channel, PSBCH)).

[0074] Figure 5 The control plane protocol stack shown may include a PHY layer, a MAC layer, an RLC layer, and a Radio Resource Control (RRC) layer. Sidelink communication between UE#5 235 and UE#6 236 can be performed using a PC5 interface (e.g., a PC5-C interface). Figure 6 The control plane protocol stack shown can be a control plane protocol stack used for one-to-one side link communication. Figure 6 The control plane protocol stack shown may include the PHY layer, MAC layer, RLC layer, PDCP layer, and PC5 signaling protocol layer.

[0075] 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.

[0076] PSDCH can be used in the discovery process. For example, a discovery signal can be sent via PSDCH. PSBCH can be used to send and receive broadcast information (e.g., system information). Furthermore, demodulation reference signals (DMRS), synchronization signals, etc., can be used in sidelink communication between UE#5 235 and UE#6 236. Synchronization signals can include the primary sidelink synchronization signal (PSSS) and the secondary sidelink synchronization signal (SSSS).

[0077] On the other hand, the side link transmission modes (TM) can be classified as side link TM#1 to TM#4 as shown in Table 2 below.

[0078] [Table 2]

[0079] Side Link™ describe #1 Sending data using resources scheduled by the base station #2 UE transmits autonomously without base station scheduling. #3 In V2X communication, resources scheduled by the base station are used for transmission. #4 In V2X communication, the UE transmits autonomously without the need for base station scheduling.

[0080] When sidelink TM#3 or TM#4 is supported, each of UE#5 235 and UE#6 236 can utilize the resource pool configured by base station 210 to perform sidelink communication. The resource pool can be configured for each item in the sidelink control information and sidelink data.

[0081] The resource pool for sidelink control information can be configured based on RRC signaling procedures (e.g., dedicated RRC signaling procedures, broadcast RRC signaling procedures). The resource pool for receiving sidelink control information can be configured via a broadcast RRC signaling procedure. When sidelink TM#3 is supported, the resource pool for sending sidelink control information can be configured via a dedicated RRC signaling procedure. In this case, sidelink control information can be sent using resources scheduled by base station 210 within the resource pool configured by the dedicated RRC signaling procedure. When sidelink TM#4 is supported, the resource pool for sending sidelink control information can be configured via either a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, sidelink control information can be sent using resources autonomously selected by the UE (e.g., UE#5235 or UE#6236) within the resource pool configured by the dedicated RRC signaling procedure or the broadcast RRC signaling procedure.

[0082] When sidelink TM#3 is supported, a resource pool for transmitting and receiving sidelink data does not need to be configured. In this case, sidelink data can be transmitted and received using resources scheduled by base station 210. When sidelink TM#4 is supported, a resource pool for transmitting and receiving sidelink data can be configured using a dedicated RRC signaling procedure or a broadcast RRC signaling procedure. In this case, sidelink data can be transmitted and received using resources autonomously selected by the UE (e.g., UE#5 235 or UE#6 236) from the resource pool configured by the RRC signaling procedure or the broadcast RRC signaling procedure.

[0083] The sidelink communication method will now be described. Even when describing a method to be performed at the first communication node (e.g., transmitting or receiving a signal), 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 a signal). That is, when describing the operation of UE#1 (e.g., vehicle #1), its corresponding UE#2 (e.g., vehicle #2) can perform an operation corresponding to the operation of UE#1. Conversely, when describing the operation of UE#2, the corresponding UE#1 can perform an operation corresponding to the operation of UE#2. In the exemplary embodiments described below, the operation of the vehicle can be the operation of a communication node located in the vehicle.

[0084] In an exemplary embodiment, signaling can be one or a combination of two or more of higher-layer signaling, MAC signaling, and physical (PHY) signaling. Messages used for higher-layer signaling can be referred to as "high-layer messages" or "high-layer signaling messages." Messages used for MAC signaling can be referred to as "MAC messages" or "MAC signaling messages." Messages used for PHY signaling can be referred to as "PHY messages" or "PHY signaling messages." Higher-layer signaling can refer to the operation of sending and receiving system information (e.g., Master Information Block (MIB), System Information Block (SIB)) and / or RRC messages. MAC signaling can refer to the operation of sending and receiving MAC control elements (CE). PHY signaling can refer to the operation of sending and receiving control information (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI), or SCI).

[0085] Sidelink signals can be synchronization signals and reference signals used for sidelink communication. For example, synchronization signals can be Synchronization Signal / Physical Broadcast Channel (SS / PBCH) blocks, Sidelink Synchronization Signals (SLSS), Primary Sidelink Synchronization Signals (PSSS), Secondary Sidelink Synchronization Signals (SSSS), etc. Reference signals can be Channel State Information-Reference Signals (CSI-RS), DMRS, Phase Tracking-Reference Signals (PT-RS), Cell Specific Reference Signals (CRS), Sounding Reference Signals (SRS), Discovery Reference Signals (DRS), etc.

[0086] 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.

[0087] Sidelink communication can be performed using either a single SCI scheme or a multi-SCI scheme. When using a single SCI scheme, it can be based on one SCI (e.g., Phase 1 SCI (1...)). st -stage SCI) is used to perform data transmission (e.g., sidelink data transmission, sidelink-shared channel (SL-SCH) transmission). When using a multi-SCI scheme, two SCIs can be used (e.g., stage 1 SCI and stage 2 SCI). nd Data transmission is performed using a stage SCI. SCIs can be transmitted via PSCCH and / or PSSCH. When using a single SCI scheme, SCIs can be transmitted on the PSCCH (e.g., stage 1 SCI). When using a multi-SCI scheme, stage 1 SCIs can be transmitted on the PSCCH, and stage 2 SCIs can be transmitted on either the PSCCH or PSSCH. A stage 1 SCI can be referred to as "stage 1 SCI," and a stage 2 SCI can be referred to as "stage 2 SCI." The format of a stage 1 SCI can include SCI format 1-A, and the format of a stage 2 SCI can include SCI format 2-A and SCI format 2-B.

[0088] The first-stage SCI may include one or more of the following information elements: priority information, frequency resource allocation information, time resource allocation information, resource reservation period information, demodulation reference signal (DMRS) mode information, 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 of the following information elements: HARQ processor identifier (ID), redundancy version (RV), source ID, destination ID, CSI request information, area ID, and communication range requirements.

[0089] On the other hand, the second-stage SCI can be mapped from the first PSSCH symbol, which includes the PSSCH DMRS. In an exemplary embodiment, “mapping signals, information, and / or data to physical resources (e.g., symbols)” can include the meaning of “signals, information, and / or data being transmitted through the mapped physical resources.” The location of the PSSCH DMRS (e.g., DMRS) can be determined based on Table 3 below.

[0090] [Table 3]

[0091]

[0092] l d This can be represented as the duration of resources scheduled for sending PSSCH and its associated PSCCH. d It can be set on a symbol-by-symbol basis. The location of PSSCH DMRS can vary depending on the PSCCH duration (e.g., 2 or 3 symbols). The location of PSSCH DMRS can be determined based on the number of PSSCH DMRS within a time slot. Based on Table 3, sidelink channels and / or signals can be mapped to physical resources as shown below.

[0093] Figure 7 This is a conceptual diagram illustrating a first exemplary embodiment of a physical resource to which sidelink channels and / or signals are mapped.

[0094] Reference Figure 7 A PSCCH (e.g., a Phase 1 SCI) can be mapped to three symbols (e.g., symbols #1 to #3) within a time slot (e.g., a side link (SL) time slot), and a PSSCH can be mapped to 12 symbols within a time slot. The PSSCH can be scheduled by the Phase 1 SCI and / or the Phase 2 SCI. When using four PSSCH DMRSs, the four PSSCH DMRSs can be mapped to symbols #1, #4, #7, and #10 within a time slot. The Phase 2 SCI can be mapped from symbol #1, where the Phase 1 PSSCH DMRS exists.

[0095] During PSSCH DMRS mapping, the size of the sidelink subchannel (e.g., SL subchannel size) and / or the PSCCH size (e.g., sl-FreqResourcePSCCH) can be additionally considered. The SL subchannel size can be set by higher-layer signaling (e.g., system information and / or RRC messages). For example, the SL subchannel size can be set to 10 physical resource blocks (PRBs), 12 PRBs, 15 PRBs, 20 PRBs, 25 PRBs, 50 PRBs, 75 PRBs, or 100 PRBs. The PSCCH size can also be set by higher-layer signaling. For example, the PSCCH size can be set to 10 PRBs, 12 PRBs, 15 PRBs, 20 PRBs, or 25 PRBs. The PSCCH size can be set to be equal to or less than the SL subchannel size.

[0096] PSCCH and PSSCH DMRS can be mapped to the same or different symbols in the time domain. "PSCCH and PSSCH DMRS are mapped to the same symbol in the time domain" can mean "PSCCH and PSSCH DMRS are multiplexed in the frequency domain." The symbols to which PSCCH and PSSCH DMRS are mapped can be configured considering the SL subchannel size and / or PSCCH size. Depending on the SL subchannel size and / or PSCCH size, PSCCH and PSSCH DMRS may not be mapped to the same symbol. When the SL subchannel size is less than 20 PRBs, PSCCH and PSSCH DMRS may not be mapped to the same symbol. For example, when the SL subchannel size is 15 PRBs and the PSCCH size is 10 PRBs, PSCCH and PSSCH DMRS may not be mapped to the same symbol. When PSCCH and PSSCH DMRS are not mapped to the same symbol, sidelink channels and / or signals can be mapped to physical resources as follows.

[0097] Figure 8 This is a conceptual diagram illustrating a second exemplary embodiment to which sidelink channels and / or signals are mapped.

[0098] Reference Figure 8A PSCCH (e.g., a first-stage SCI) can be mapped to three symbols within a time slot (e.g., symbols #1 to #3), and a PSSCH can be mapped to 12 symbols within a time slot. The PSSCH can be scheduled by the first-stage SCI and / or the second-stage SCI. When using two PSSCH DMRSs, the two PSSCH DMRSs can be mapped to symbols #4 and #10 within a time slot. The second-stage SCI can be mapped from symbol #4 where the first PSSCH DMRS exists. In this case, since the second-stage SCI is mapped to the first-stage SCI (e.g., PSCCH) in the time domain, the interval monitored by the terminal for receiving SCIs (e.g., both the first and second-stage SCIs) may increase. Accordingly, the power consumption of the terminal (e.g., a pedestrian (P) terminal) may increase. The P terminal can be a terminal carried by a pedestrian.

[0099] In the following exemplary embodiments, second-stage SCI mapping conditions and methods for power saving of a terminal (e.g., a P terminal) will be described. The second-stage SCI mapping method for a P terminal (e.g., a terminal supporting power-saving operation) can be configured independently of the second-stage SCI mapping method for a terminal that is not a P terminal (e.g., a vehicle (V) terminal). That is, the second-stage SCI mapping method for a P terminal can differ from the second-stage SCI mapping method for a terminal that is not a P terminal. The V terminal can be a terminal installed in a vehicle.

[0100] [Second-stage SCI mapping method]

[0101] The transmitting terminal can map the second-stage SCI to the preceding region of a time slot (e.g., symbols #0 to #4). For example, the transmitting terminal can map the second-stage SCI from symbols following the Automatic Gain Control (AGC) symbol within the time slot. The AGC symbol can be a symbol used for AGC operation. Alternatively, the transmitting terminal can map the second-stage SCI from symbols preceding a specific symbol within the time slot. The base station can configure the terminals (e.g., the transmitting terminal and / or the receiving terminal) to allow the above mapping operations to be performed. Alternatively, the base station can use higher-layer messages to send information indicating that the above mapping operation is enabled, and the transmitting terminal can send a first-stage SCI indicating that the above mapping operation is used to the receiving terminal.

[0102] Here, the receiving terminal can be a P terminal. In this case, the receiving terminal can expect the second-stage SCI to be mapped from the symbol following the AGC symbol, and can perform the second-stage SCI reception operation (e.g., decoding operation) from the symbol following the AGC symbol. Alternatively, the receiving terminal can expect the second-stage SCI to be mapped from the symbol preceding a specific symbol, and can perform the second-stage SCI reception operation from the symbol preceding the specific symbol. Therefore, the power consumption of the receiving terminal can be reduced during the second-stage SCI reception operation.

[0103] The detailed method for the second-stage SCI mapping is as follows.

[0104] [Mapping Method 1]

[0105] The base station can set the SL subchannel size of a terminal (e.g., a P terminal or a terminal supporting power-saving operation) to a value equal to or greater than a threshold. This can be referred to as "mapping method 1". For example, the base station can set the SL subchannel size to 20 PRBs or more and send the configuration information of the SL subchannel size to the terminal. In this case, the SL subchannel size can be set to 20 PRBs, 25 PRBs, 50 PRBs, 75 PRBs, or 100 PRBs. When the SL subchannel size is set to 20 PRBs or more, the PSCCH can always be multiplexed with the PSSCH DMRS (e.g., the first PSSCH DMRS) in the frequency domain. That is, the PSCCH and PSSCH DMRS can be mapped to the same symbols in the time domain.

[0106] When the SL subchannel size increases, the frequency domain size of the resource pool used by the terminal may increase. As the frequency domain size of the resource pool increases, the number of PSCCH blind detections performed by the terminal within the resource pool may increase. In this case, the power consumption of the terminal (e.g., P terminal) may increase. Therefore, the base station can set the SL subchannel size for the P terminal to 20 PRBs and can send configuration information for the SL subchannel size. That is, the SL subchannel size for the P terminal can be fixed at 20 PRBs.

[0107] [Mapping Method 2]

[0108] Even when the SL subchannel size is less than 20 PRBs, the terminal (e.g., P terminal) can be allowed to multiplex PSCCH and PSSCH DMRS (e.g., first PSSCH DMRS) in the frequency domain, regardless of the PSCCH size. This can be referred to as "mapping method 2". The base station can send information indicating permission for mapping method 2 to the terminal using at least one of system information, RRC information, MAC CE, or control information. Alternatively, the base station can send information indicating that mapping method 2 is enabled using higher-layer messages, and the transmitting terminal can send a first-stage SCI including information indicating the use of mapping method 2 to the receiving terminal.

[0109] When mapping method 2 is enabled, the transmitting node can multiplex the PSCCH (e.g., the first-stage SCI) and PSSCH DMRS (e.g., the first PSSCH DMRS) in the frequency domain, regardless of the PSCCH size. Furthermore, the transmitting node can map the second-stage SCI to the symbol containing the first PSSCH DMRS, or vice versa. Therefore, the first-stage SCI and the second-stage SCI can be transmitted in the same symbol. The receiving node can expect to multiplex the PSCCH and PSSCH DMRS in the frequency domain regardless of the PSCCH size and perform reception operations (e.g., decoding operations) of both the first-stage SCI and the second-stage SCI in the same symbol.

[0110] [Mapping Method 3]

[0111] Regardless of the location of the PSSCH DMRS (e.g., the first PSSCH DMRS), the second-stage SCI (e.g., the second-stage SCI of the P terminal) can be allowed to be mapped to the preceding region within the time slot (e.g., the symbol following the AGC symbol or the symbol preceding a specific symbol). This can be referred to as "mapping method 3". In this case, the second-stage SCI can be mapped to the symbol preceding the symbol where the PSSCH DMRS (e.g., the first PSSCH DMRS) is located. Furthermore, when using mapping method 3, the second-stage SCI can be mapped to the preceding region within the time slot, regardless of the SL subchannel size, PSCCH size, and the location of the PSCCH DMRS. The base station can send information indicating that mapping method 3 is allowed to the terminal using at least one of system information, RRC information, MAC CE, or control information. Alternatively, the base station can send a higher-layer message including information indicating that mapping method 3 is enabled, and the transmitting terminal can send a first-stage SCI including information indicating that mapping method 3 is used to the receiving terminal.

[0112] When mapping method 3 is enabled, the transmitting terminal can map the second-stage SCI to a physical resource (e.g., a symbol preceding the symbol where the first PSSCH DMRS is located), regardless of the location of the PSSCH DMRS. In this case, the first-stage SCI and the second-stage SCI can be mapped to the same symbol. The receiving terminal (e.g., a P terminal) can expect the second-stage SCI to be mapped to a physical resource, regardless of the location of the PSSCH DMRS, and can perform the reception operation of the second-stage SCI in a symbol preceding the symbol where the PSSCH DMRS is located. For example, the receiving terminal can perform the reception operation of the first-stage SCI and the second-stage SCI in the same symbol.

[0113] [Mapping Method 4]

[0114] Regardless of the SL subchannel size and PSCCH size, it is possible for the second-stage SCI to be mapped from the fourth symbol within a time slot (e.g., symbol #3). Here, the number of PSSCH DMRS can be two. In the above case, the PSSCH DMRS of the terminal (e.g., the first PSSCH DMRS) can always be mapped from the preceding region within the time slot (e.g., the symbol following the AGC symbol). Since the second-stage SCI can be mapped from the symbol containing the first PSSCH DMRS, the second-stage SCI can also be mapped to the preceding region within the time slot. This can be referred to as "mapping method 4". To support mapping method 4, the position of the first PSSCH DMRS can be set to the symbol following the AGC symbol (e.g., symbol #1), as shown in Table 4 or Table 5 below.

[0115] [Table 4]

[0116]

[0117] [Table 5]

[0118]

[0119]

[0120] As another method to support mapping method 4, the first PSSCH DMRS can be configured to be located at the symbol preceding a specific symbol within a time slot. In this case, to improve PSSCH decoding performance, when there are two PSSCH DMRS, the position of the second PSSCH DMRS can be set based on Tables 6 to 11 below.

[0121] [Table 6]

[0122]

[0123] [Table 7]

[0124]

[0125] [Table 8]

[0126]

[0127]

[0128] [Table 9]

[0129]

[0130] [Table 10]

[0131]

[0132]

[0133] [Table 11]

[0134]

[0135] Tables 4 through 11 mentioned above can be pre-configured in the technical specifications. The base station can notify the terminal of the configuration information in Tables 4 through 11 using at least one of system information, RRC messages, MAC CE, or control information. When the base station configures multiple tables in Tables 4 through 11, the base station can notify the terminal of information indicating the tables to be used in the multiple tables by using at least one of system information, RRC messages, MAC CE, or control information. Alternatively, when the base station configures multiple tables in Tables 4 through 11, the transmitting node can send an SCI (e.g., a first-stage SCI and / or a second-stage SCI) that includes information indicating the tables to be used in the multiple tables.

[0136] Alternatively, the base station may send information indicating permission for mapping method 4 to the terminal using at least one of system information, RRC messages, MAC CE, or control information. Or, the base station may send information indicating that mapping method 4 is enabled using higher-layer messages, and the transmitting terminal may send a first-stage SCI including information indicating the use of mapping method 4 to the receiving terminal.

[0137] When mapping method 4 is enabled, the transmitting terminal can determine the location of the PSSCH DMRS based on at least one of Tables 4 to 11, and map the second-stage SCI to physical resources based on the location of the PSSCH DMRS. The receiving terminal (e.g., P terminal) can determine the location of the PSSCH DMRS based on at least one of Tables 4 to 11, expecting the second-stage SCI to be mapped to physical resources based on the location of the PSSCH DMRS, and performs the second-stage SCI reception operation accordingly.

[0138] [Methods to reduce the number of times PSCCH blind detection is performed]

[0139] The number of PSCCH blind detection operations may vary depending on the frequency domain size of the resource pool. For example, as the frequency domain size of the resource pool increases, the number of PSCCH blind detection operations may also increase. In this case, the power consumption of the terminal (e.g., P terminal) may increase. Therefore, reducing the number of PSCCH blind detection operations may be important to save terminal power. To reduce the number of PSCCH blind detection operations, the base station can set the SL sub-channel size (e.g., the maximum value of the SL sub-channel size) for the terminal (e.g., P terminal). For example, the maximum value of the SL sub-channel size could be 10 PRBs. In this case, the base station can set the SL sub-channel size to be less than or equal to the maximum value and can send the SL sub-channel size configuration information to the terminal (e.g., transmitting terminal, receiving terminal, and P terminal). Therefore, the terminal can use the SL sub-channel with a size less than or equal to the maximum value to perform sidelink communication. Alternatively, the base station can notify the terminal (e.g., transmitting terminal, receiving terminal, and P terminal) of the maximum value of the SL sub-channel size, in which case the terminal can take the maximum value of the SL sub-channel size into account when performing sidelink communication. For example, a P terminal and / or another terminal communicating with the P terminal may consider the maximum value of the SL sub-channel size when performing sidelink communication. Terminals other than the P terminal (e.g., terminals that do not communicate with the P terminal) may not consider the maximum value of the SL sub-channel size.

[0140] Alternatively, to reduce the number of PSCCH blind detection operations, the base station can set a resource pool size (e.g., a maximum resource pool size) for the terminal (e.g., a P terminal). For example, the maximum resource pool size for a P terminal could be 10 PRBs. The methods described above for reducing the number of PSCCH blind detection operations can be applied to SCI mapping methods 1 to 4 in the second stage described above.

[0141] [Methods for setting a smaller PSCCH size]

[0142] To conserve power for terminals (e.g., P terminals), the PSCCH size can be set to a smaller value. The base station can set the PSCCH size (e.g., the maximum PSCCH size) for the terminals (e.g., P terminals). For example, the maximum PSCCH size could be 10 PRBs. In this case, the base station can set the PSCCH size to be equal to or less than the maximum value and can send the PSCCH size configuration information to the terminals (e.g., the transmitting terminal, the receiving terminal, and the P terminal). Therefore, the terminal can perform sidelink communication using a PSCCH with a value less than or equal to the maximum value. Alternatively, the base station can notify the terminals (e.g., the transmitting terminal, the receiving terminal, and the P terminal) of the maximum PSCCH size, in which case the terminal can consider the maximum PSCCH size when performing sidelink communication. For example, the P terminal and / or another terminal communicating with the P terminal can consider the maximum PSCCH size when performing sidelink communication. Terminals other than the P terminal (e.g., terminals not communicating with the P terminal) can disregard the maximum PSCCH size.

[0143] Alternatively, a PSCCH and / or SL subchannel with a size of less than 10 PRBs can be introduced for the terminal (e.g., a P terminal). The information elements included in the first-stage SCI of a PSCCH with a size of less than 10 PRBs may differ from the information elements included in the first-stage SCI of a PSCCH with a size of 10 PRBs or greater. For example, the number of information elements included in the first-stage SCI of a PSCCH with a size of less than 10 PRBs may be less than the number of information elements included in the first-stage SCI of a PSCCH with a size of 10 PRBs or more.

[0144] When the PSCCH size is less than 10 PRBs, a new first-stage SCI format can be configured that includes only specific information elements or that does not include specific information elements. The new first-stage SCI format can be referred to as "SCI format 1-B". Specific information excluded from SCI format 1-B may include resource reservation information, frequency resource allocation information, time resource allocation information, and / or resource reservation period information. The base station can use at least one of system information, RRC information, MACCE, or control information to send information to the terminal allowing the P terminal to use SCI format 1-B. Since SCI format 1-B does not include resource reservation information, the base station can use at least one of system information, RRC messages, MACCE, or control information to send information to the terminal indicating that only random selection operation is allowed in the P terminal receiving SCI format 1-B.

[0145] A terminal (e.g., a transmitting terminal, a receiving terminal, and / or a P terminal) can receive the aforementioned information from the base station, identify that SCI format 1-B is permitted, and identify that only random selection is permitted in the P terminal receiving SCI format 1-B. The transmitting terminal can send SCI format 1-B to the P terminal (e.g., the receiving terminal), and the P terminal can receive SCI format 1-B from the transmitting terminal. When SCI format 1-B is received, the P terminal can perform only random selection. The method of setting a smaller PSCCH size described above can be applied to the second-stage SCI mapping methods 1 to 4 described above.

[0146] The above exemplary embodiments, the above configuration, whether to apply the above configuration, the above conditions, whether to apply the above conditions, the above parameters, and whether to apply the above parameters can be configured in a resource pool-specific, service-specific, cell-specific, or terminal-specific manner by utilizing at least one of system information, RRC messages, MAC CE, control information, or PC5 signaling messages.

[0147] The methods disclosed herein can be implemented as program instructions executable by various computers and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or combinations thereof. The program instructions recorded on the computer-readable medium may be specifically designed and configured for this disclosure, or may be well known and available to those skilled in the art of computer software.

[0148] Examples of computer-readable media may include hardware devices such as ROM, RAM, and flash memory, specifically configured to store and execute program instructions. Examples of program instructions include, for example, machine code generated by a compiler, and high-level language code that can be executed by a computer using an interpreter. The exemplary hardware devices described above may be configured to operate by at least one software module to perform the operations of this disclosure, and vice versa.

[0149] Although exemplary embodiments of the present disclosure have been described in detail, it should be understood that those skilled in the art to which this invention pertains may make various changes and modifications herein without departing from the spirit and scope of the present disclosure as set forth in the claims.

Claims

1. An operation method for a transmitting terminal, which is an operation method for a transmitting terminal in a communication system, comprising: To save power for the receiving terminal, configuration information is received from the base station, which is set to be equal to or greater than a first threshold, i.e., the size of the side link sub-channel, i.e., the SL sub-channel size. When the size of the SL sub-channel is greater than or equal to the first threshold, the physical side link control channel (PSCCH) and the first physical side link shared channel demodulation reference signal (PSSCH DMRS) are multiplexed in the frequency domain; and The second-stage sidelink control information, i.e., the second-stage SCI, is mapped to the symbol where the first PSSCH DMRS is located. Specifically, when the PSCCH size is less than the second threshold, a new first-stage SCI containing specific information is used, and the size of the new first-stage SCI is less than the size of the first-stage SCI used when the PSCCH size is greater than or equal to the second threshold.

2. The operating method according to claim 1, wherein, The first threshold is 20 physical resource blocks (PRBs), and the size of the SL subchannel is greater than or equal to the size of the PSCCH.

3. The operating method according to claim 1, wherein, The PSCCH size is set below the second threshold to save power for the receiving terminal.

4. The operating method according to claim 1, further comprising: Receive information from the base station authorizing the use of the new Phase 1 SCI.

5. An operation method for a transmitting terminal, which is an operation method for a transmitting terminal in a communication system, comprising: The configuration information of the SL sub-channel size received from the base station and the PSCCH size of the physical side link control channel are obtained. When the size of the SL sub-channel is less than the first threshold, the PSCCH and the first physical side link share the channel demodulation reference signal, i.e., the first PSSCH DMRS, in the frequency domain, regardless of the size of the PSCCH. as well as The second-stage sidelink control information, i.e., the second-stage SCI, is mapped to the symbol where the first PSSCH DMRS is located. Specifically, when the PSCCH size is less than the second threshold, a new first-stage SCI containing specific information is used, and the size of the new first-stage SCI is less than the size of the first-stage SCI used when the PSCCH size is greater than or equal to the second threshold.

6. The operating method according to claim 5, further comprising: The base station receives information that, when the size of the SL subchannel is less than the first threshold, it allows the PSCCH to be multiplexed with the first PSSCHDMRS in the frequency domain, regardless of the size of the PSCCH.

7. The operating method according to claim 5, wherein, The first threshold is 20 physical resource blocks (PRBs), and the size of the SL subchannel is greater than or equal to the size of the PSCCH.

8. The operating method according to claim 5, wherein, The PSCCH size is set below the second threshold to save power for the receiving terminal.

9. The operating method according to claim 5, wherein, Receive information from the base station authorizing the use of the new Phase 1 SCI.

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