Method and apparatus for sidelink positioning in wireless communication system

Abstract

The present disclosure relates to a 5th-Generation (5G) or 6th-Generation (6G) communication system for supporting higher data transmission rates. Disclosed is a method performed by a first terminal in a wireless communication system supporting SL, comprising: identifying whether an S-PRS sequence ID for generation of an S-PRS is obtained from a higher layer of the first terminal; generating an S-PRS on the basis of the obtained S-PRS sequence ID when the S-PRS sequence ID is obtained from the higher layer of the first terminal; generating an S-PRS sequence ID on the basis of the 12 LSBs of the CRC for the PSCCH associated with the S-PRS; generating an S-PRS on the basis of the generated S-PRS sequence ID in a case where the S-PRS sequence ID is not obtained from a higher layer of the first terminal; and transmitting the generated S-PRS to the second terminal.

Description

Technical Field

[0001] The present disclosure generally relates to a wireless mobile communication system, and more particularly, to a method and apparatus for performing positioning (position measurement) through a side link in the wireless mobile communication system. Background Art

[0002] The fifth generation (5G) mobile communication technology defines a wide frequency band for realizing high transmission rates and new services, and can be implemented not only in frequency bands below 6 GHz such as 3.5 GHz, but also in frequency bands above 6 GHz, called millimeter waves (mmWave), including 28 GHz and 39 GHz. The implementation of the sixth generation (6G) mobile communication technology (called super 5G system) in THz frequency bands such as 95 GHz to 3 terahertz (THz) frequency bands has also been considered to realize transmission rates 50 times faster than 5G mobile communication technology and ultra-low latency one-tenth of 5G mobile communication technology.

[0003] Since the start of 5G mobile communication technology development, in order to support services and meet performance requirements related to enhanced mobile broadband (eMBB), ultra reliable low latency communication (URLLC) and massive machine-type communication (mMTC), there has been ongoing standardization on the following: beamforming and massive multi-input multi-output (MIMO) for mitigating radio wave path loss and increasing the radio wave transmission distance of millimeter waves; support for basic parameter sets, such as operating multiple subcarrier spacing to efficiently utilize millimeter wave resources and dynamic operation of time slot formats; initial access technology for supporting multi-beam transmission and broadband; definition and operation of bandwidth part (BWP); new channel coding methods, such as low density parity check (LDPC) codes for large data transmission and polar codes for highly reliable transmission of control information; layer 2 (L2) preprocessing; and network slicing for providing dedicated networks dedicated to specific services.

[0004] Discussions are also ongoing on improvements and performance enhancements to initial 5G mobile communication technologies in view of the services they will support, and there is already physical layer standardization on technologies such as: vehicle-to-everything (V2X), for assisting driving decisions of autonomous vehicles based on information sent by the vehicle about the vehicle's location and status, and for enhancing user convenience; new radio unlicensed (NR-U), for system operation that complies with various regulatory requirements in unlicensed frequency bands; NR user equipment (UE) power saving; non-terrestrial network (NTN), i.e., UE-satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable; and positioning.

[0005] There is also ongoing standardization in air interface architecture / protocols for technologies such as the following: industrial Internet of things (IIoT) for supporting new services by interworking and converging with other industries; integrated access and backhaul (IAB) for providing nodes for network service area extension by supporting wireless backhaul links and access links in an integrated manner; mobility enhancement, including conditional handover and dual active protocol stack (DAPS) handover; and two-step random access for simplifying random access channel (RACH) procedures (2-step RACH for NR). There is also ongoing standardization in system architecture / services for the following: 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network functions virtualization (NFV) and software-defined networking (SDN) technologies; and mobile edge computing (MEC) for receiving services based on UE location.

[0006] With the commercialization of 5G mobile communication systems, the number of devices connected to the communication network is expected to grow exponentially, and accordingly, enhanced functions and performance of 5G mobile communication systems and integrated operations of networked devices are expected to be necessary. To this end, new research related to extended reality (XR) is scheduled for efficient support of augmented reality (AR), virtual reality (VR), mixed reality (MR), 5G performance improvement and complexity reduction by utilizing artificial intelligence (AI) and machine learning (ML), AI service support, metaverse service support, and drone communication.

[0007] Such development of 5G mobile communication systems will serve not only as a basis for developing: new waveforms for providing coverage of the terahertz band for 6G mobile communication technology; multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas; metamaterial-based lenses and antennas for improving coverage of terahertz band signals; high-dimensional spatial multiplexing technologies using orbital angular momentum (OAM); and reconfigurable intelligent surfaces (RIS), but will also serve as a basis for developing: full-duplex technologies for improving frequency efficiency and improving system networks for 6G mobile communication technology; AI-based communication technologies for implementing system optimization by utilizing satellites and AI (artificial intelligence) from the design stage and internalizing end-to-end AI support functions; and next-generation distributed computing technologies for implementing services with a level of complexity that exceeds the limits of UE operating capabilities by utilizing ultra-high performance communication and computing resources.

[0008] In order to meet the increasing demand for wireless data services after the commercialization of the fourth generation (4G) communication system, efforts have been made to develop an improved 5G NR system. Unlike LTE, the 5G communication system supports various subcarrier spacings, including 15kHz, 30kHz, 60kHz and 120kHz, where the physical control channel uses polarity coding and the physical data channel uses LDPC. In addition, not only discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM), but also cyclic prefix OFDM (cyclic prefix OFDM, CP-OFDM) is used as a waveform for uplink transmission. Although LTE supports hybrid ARQ (HARQ) retransmission in units of transport blocks (TB), 5G can additionally support HARQ retransmission based on code block groups (CBG) composed of multiple code blocks (CB).

[0009] In order to improve the system network for the 5G communication system, various technologies have been developed, such as evolved small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, vehicle communication networks (e.g., V2X), cooperative communication, coordinated multi-points (CoMP), and reception interference cancellation.

[0010] The Internet has evolved from a human-based connected network in which humans create and consume information to the Internet of Things (IoT) in which distributed components (such as objects) exchange information with each other to process information. Internet of everything (IoE) technology, which combines IoT technology and big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology and security technology are required. Therefore, technologies for inter-object connection, such as sensor networks, machine to machine (machine to machine, M2M) communication or machine type communication (MTC), have been studied recently. In the IoT environment, intelligent Internet technology (Internet technology, IT) services can be provided, which collect and analyze data generated by networked objects and create new value in human life. Through the integration and combination between existing information technology (IT) and various industries, IoT can be applied to various fields, such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart appliances and advanced medical services.

[0011] Accordingly, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies related to sensor networks, machine-to-machine (M2M) communications, and machine-type communications (MTC) are being implemented using 5G communication technologies including beamforming, MIMO, and array antennas. The above-mentioned application of cloud RAN as a big data processing technology can also be considered as an example of the fusion of 5G technology and IoT technology. In this way, a variety of services can be provided to users in a communication system, and a method for providing multiple services in the same time domain according to characteristics in order to provide multiple services to users and a device using the method are required. Various services provided by 5G communication systems are being studied. One of these services meets the requirements of low latency and high reliability. In addition, the demand for mobile services is also increasing, and location-based services (LBS), which are mainly driven by two main requirements, namely emergency services and commercial applications, are also growing rapidly. Specifically, in the communication using the side link, the NR side link system supports unicast communication, groupcast (or multicast) communication, and broadcast communication between terminals. Unlike the LTE sidelink, which is designed to send and receive basic safety information required to operate a vehicle on the road, the NR sidelink is designed to provide more advanced services such as platooning, advanced driving, extended sensors and remote driving.

[0012] Specifically, in the NR side link, positioning (position measurement) can be performed by a side link between terminals. Therefore, a method for measuring the terminal position by using a positioning signal sent via a side link can be considered. A traditional method of measuring the terminal position by using a positioning signal sent via a downlink and uplink between a terminal and a base station is feasible only when the terminal is within the coverage area of ​​the base station. However, when sidelink positioning is introduced, the position of the terminal can be measured even when the terminal is outside the coverage area of ​​the base station. The terminal can send a sidelink positioning reference signal (S-PRS) to perform positioning in the side link, in which case a sequence generation method for S-PRS can be considered.

[0013] However, conventionally, there is a lack of an S-PRS transmission method that can ensure good sidelink positioning performance.

[0014] Therefore, there is a need in the art to provide a method and apparatus for sending S-PRS during the process of measuring (positioning) the position of a terminal in a side link to ensure good side link positioning performance. Summary of the invention

[0015] Technical issues

[0016] The present disclosure has been made to address at least the above-mentioned problems and / or disadvantages and to provide at least the advantages described below.

[0017] The present disclosure relates to a wireless mobile communication system, and in particular, to a method and apparatus for performing positioning (position measurement) through a side link. Specifically, a method for transmitting a positioning reference signal when performing positioning through a side link is proposed.

[0018] Technical Solution

[0019] Accordingly, an aspect of the present disclosure is to provide a method and a program for transmitting a reference signal when a terminal performs positioning (position measurement) through a side link so that positioning can be performed in the side link.

[0020] Another aspect of the present disclosure is to provide a method for generating a pseudo-random based sequence and a Zadoff-Chu based S-PRS sequence and pattern in consideration of a side link environment.

[0021] Another aspect of the present disclosure is to provide a method that can transmit symbols of a side link time slot S-PRS, can transmit REs on a frequency axis S-PRS, and can multiplex the S-PRS with other channels and signals.

[0022] Another aspect of the present disclosure is to provide parameters required for transmission of an S-PRS, a method for configuring the parameters, and a terminal operation based thereon.

[0023] According to one aspect of the present disclosure, a method performed by a first terminal in a wireless communication system supporting a side link includes: identifying whether an S-PRS sequence ID for generating an S-PRS is obtained from a higher layer of the first terminal; in a case where the S-PRS sequence ID is obtained from a higher layer of the first terminal, generating an S-PRS based on the obtained S-PRS sequence ID; generating the S-PRS sequence ID based on 12 least significant bits (LSBs) of a cyclic redundancy check (CRC) of a physical sidelink control channel (PSCCH) associated with the S-PRS; in a case where the S-PRS sequence ID is not obtained from a higher layer of the first terminal, generating the S-PRS based on the generated S-PRS sequence ID; and sending the generated S-PRS to a second terminal.

[0024] According to one aspect of the present disclosure, a first terminal in a wireless communication system supporting a side link includes: a transceiver; and a processor, which is operably coupled to the transceiver and configured to: identify whether an S-PRS sequence ID for generating an S-PRS is obtained from a higher layer of the first terminal; in the case where the S-PRS sequence ID is obtained from the higher layer of the first terminal, generate an S-PRS based on the obtained S-PRS sequence ID; generate the S-PRS sequence ID based on 12 least significant bits (LSBs) of a cyclic redundancy check (CRC) for a physical sidelink control channel (PSCCH) associated with the S-PRS; in the case where the S-PRS sequence ID is not obtained from the higher layer of the first terminal, generate the S-PRS based on the generated S-PRS sequence ID; and send the generated S-PRS to a second terminal.

[0025] According to one aspect of the present disclosure, a second terminal in a wireless communication system supporting a side link includes: a transceiver; and a processor, which is operably coupled to the transceiver and configured to: obtain an S-PRS sequence ID for a first terminal; receive an S-PRS from the first terminal; and generate information associated with the positioning of the second terminal based on the S-PRS sequence ID and the S-PRS.

[0026] Beneficial Effects

[0027] The present disclosure proposes a method and a program for transmitting a reference signal when a terminal performs positioning (position measurement) through a side link. By the proposed method, positioning can be performed in the side link. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The foregoing and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description with reference to the accompanying drawings, in which:

[0029] Figure 1 A system according to an embodiment is shown;

[0030] Figure 2 A communication method performed through a side link according to an embodiment is shown;

[0031] Figure 3 shows a resource pool defined as a set of resources in the time and frequency domains for sidelink transmission and reception according to an embodiment;

[0032] Figure 4 A method for calculating a terminal position through SL according to an embodiment is shown;

[0033] Figure 5 A method for calculating a terminal position through SL according to an embodiment is shown;

[0034] Figure 6 A method for calculating a terminal position through SL according to an embodiment is shown;

[0035] Figure 7 A method for performing positioning using an RTT scheme according to an embodiment is shown;

[0036] Figure 8 and Fig. 9 is a diagram for explaining a pattern of an S-PRS, which is a side link positioning signal, according to an embodiment;

[0037] Fig.10 A method considering using a Comb-1 pattern in S_PRS according to an embodiment is shown;

[0038] Fig.11 An example of a physical layer structure for sidelink communication according to an embodiment is shown;

[0039] Fig. 12A A method for mapping an S-PRS by avoiding a location where an existing signal is transmitted in a PSSCH region according to an embodiment is shown;

[0040] Fig. 12B A method for mapping an S-PRS by avoiding a location where an existing signal is transmitted in a PSSCH region according to an embodiment is shown;

[0041] Fig. 12C A method for mapping an S-PRS by avoiding a location where an existing signal is transmitted in a PSSCH region according to an embodiment is shown;

[0042] Fig.12D A method for transmitting an S-PRS based on the position where the last PSSCH DMRS symbol is transmitted according to an embodiment is shown;

[0043] Fig.13 A method for determining a location to send an S-PRS according to an embodiment is shown; Fig.14 A method for processing a PSCSCH region when no data is transmitted according to an embodiment is shown; Fig.15 shows a comb offset and a muting pattern during S-PRS transmission according to an embodiment; Fig.16 is a block diagram showing an internal structure of a UE according to an embodiment; and

[0044] Fig.17 is a block diagram showing an internal structure of a base station according to an embodiment. DETAILED DESCRIPTION

[0045] Hereinafter, embodiments of the present disclosure are described in detail with reference to the accompanying drawings. For the sake of clarity and conciseness, descriptions of well-known functions and constructions may be omitted.

[0046] Some components in the accompanying drawings are exaggerated, omitted or schematically shown. In addition, the size of each component may not fully reflect its actual size. In the accompanying drawings, the same or corresponding parts are represented by the same reference numerals.

[0047] With reference to the embodiments of the present disclosure described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for achieving these will become apparent. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. The embodiments provided herein make the present disclosure thorough and complete, and will fully convey to those of ordinary skill in the art the scope of the present disclosure defined only by the claims. In the specification, the same reference numerals represent the same components.

[0048] The term "~ unit" used herein refers to a software or hardware component, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and the "~ unit" performs a specific function. However, the term "~ unit" is not limited to software or hardware. "~ unit" can be constructed in an addressable storage medium, or can be constructed to operate one or more processors. Therefore, for example, "~ unit" can include components (such as software components, object-oriented software components, class components and task components), processes, functions, attributes, programs, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and variables. The functions provided in components and "~ units" can be combined into fewer components and "~ units", or can be further divided into additional components and "~ units". Components and "~ units" can be implemented as one or more central processing units (CPUs) in operating devices or secure multimedia cards. The "~ unit" in the embodiment can include one or more processors.

[0049] The 3rd Generation Partnership Project (3GPP) is a standardization organization for mobile communication standards. rd The embodiments of the present disclosure are described with reference to a new radio access network (RAN) (new radio (NR)) of the 5G mobile communication standard specified by the 3GPP (3rd Generation Partnership Project) (long term evolution) and a packet core (5G system, 5G core network or next generation (NG) core) as a core network. However, it will be obvious to those skilled in the art that the main subject matter of the present disclosure is applicable to other communication systems with similar technical backgrounds without significantly exceeding the scope of the present disclosure with slight modifications.

[0050] In the 5G system, a network data collection and analysis function (NWDAF) that provides functions for analyzing and providing data collected in the 5G network can be defined to support network automation. The NWDAF can collect / store / analyze information from the 5G network and can provide results to unspecified network functions (NFs), and the analysis results can be used independently by each NF.

[0051] For ease of explanation, some terms and names defined by 3GPP standards (standards for 5G, NR, LTE or similar systems) may be used. However, the present disclosure is not limited to the terms and names and can be equally applied to systems conforming to other standards.

[0052] In addition, the terms used herein to identify access nodes and to represent network entities, messages, term interfaces between network entities, and various types of identification information are examples for ease of explanation. Accordingly, the present disclosure is not limited to the terms used herein, and different terms may be used to refer to items having the same meaning in a technical sense.

[0053] Figure 1 A system according to an embodiment is shown.

[0054] exist Figure 1 , (a) shows an example in which all terminals UE-1 and UE-2 performing communication via the side link are located within the coverage of the base station (in-coverage (IC)). All terminals can receive data and control information from the base station via a downlink (DL) or send data and control information to the base station via an uplink (UL). The data and control information may be data and control information for sidelink communication. Alternatively, the data and control information may be data and control information for general cellular communication. The terminal may send / receive data and control information for corresponding communication via a side link (SL).

[0055] exist Figure 1 , (b) shows an example in which, among the terminals, UE-1 is located within the coverage area of ​​the base station and UE-2 is located outside the coverage area of ​​the base station. That is, (b) shows an example of partial coverage (PC) in which only some terminals (only UE-2) are located outside the coverage area of ​​the base station. UE-1, as a terminal located within the coverage area of ​​the base station, is able to receive data and control information from the base station via DL, or to send data and control information to the base station via UL. UE-2, as a terminal located outside the coverage area of ​​the base station, is unable to receive data and control information from the base station via DL, and is unable to send data and control information to the base station via UL. UE-2 is able to send / receive data and control information for corresponding communication to / from UE-1 via SL.

[0056] exist Figure 1, (c) shows an example where all terminals are located outside the coverage area of ​​the base station (out-of-coverage (OOC)). Accordingly, UE-1 and UE-2 cannot receive data and control information from the base station via DL, and cannot send data and control information to the base station via UL. UE-1 and UE-2 can send / receive data and control information via SL.

[0057] exist Figure 1 In the figure, (d) shows an example of a scenario in which sidelink communication is performed between UE-1 and UE-2 located in different cells. Specifically, (d) shows a situation in which UE-1 and UE-2 are connected to different base stations (radio resource control (RRC) connected state) or UE-1 and UE-2 reside on their respective base stations (RRC disconnected state, i.e., RRC idle state). In this case, in SL, UE-1 can be a transmitting terminal and UE-2 can be a receiving terminal. Alternatively, in SL, UE-1 can be a receiving terminal and UE-2 can be a transmitting terminal. UE-1 can receive a system information block (SIB) from a base station to which UE-1 is connected (or where UE-1 resides), and UE-2 can receive SIBs from another base station to which UE-2 is connected (or where UE-2 resides). In this case, an existing SIB can be used as a SIB, or a SIB defined separately for sidelink communication can be used as a SIB. In addition, the information of the SIB received by UE-1 and the information of the SIB received by UE-2 can be different from each other. Accordingly, in order to perform sidelink communication between UE-1 and UE-2 located in different cells, information should be unified, or a method for signaling its information and interpreting SIB information transmitted from different cells may be additionally required.

[0058] Although for the sake of convenience, Figure 1A SL system including two terminals UE-1 and UE-2 is shown, but the present disclosure is not limited thereto, and communication can be performed between more than two terminals. In addition, the interface (UL and DL) between the base station and the terminal can be referred to as a Uu interface, and the SL communication between the terminals can be referred to as a PC5 interface. Therefore, in the present disclosure, these terms can be used interchangeably. At the same time, the terminal can refer to a general terminal and a terminal that supports V2X. Specifically, the terminal can be a pedestrian's mobile phone (e.g., a smart phone). Alternatively, the terminal may include a vehicle that supports vehicle-to-vehicle (V2V) communication, a vehicle that supports vehicle-to-pedestrian (V2P) communication, a vehicle that supports vehicle-to-network (V2N) communication, or a vehicle that supports vehicle-to-infrastructure (V2I) communication. In addition, the terminal may include a roadside unit (RSU) equipped with a terminal function, an RSU equipped with a base station function, or an RSU equipped with some base station functions and some terminal functions. In addition, according to an embodiment of the present disclosure, the base station may support both V2X communication and general cellular communication, or may only support V2X communication. In this case, the base station may be a 5G base station (gNB), a 4G base station (eNB), or an RSU. Therefore, in the present disclosure, the base station may also be referred to as an RSU.

[0059] Figure 2 A communication method performed via a SL according to an embodiment is shown.

[0060] refer to Figure 2 (a), UE-1 201 (e.g., TX UE) and UE-2 202 (e.g., RX UE) can perform communication in a one-to-one manner, which can be called unicast communication. In SL, capability information and configuration information can be exchanged between terminals through PC5-RRC defined in a unicast link between terminals. Configuration information can be exchanged through a medium access control (MAC) control element (CE) defined in a unicast link between terminals.

[0061] refer to Figure 2 (b), the TX UE and the RX UE can perform one-to-many communication, which can be called groupcast or multicast communication. Figure 2In (b), UE-1 211, UE-2 212, and UE-3 213 form a group (Group A) to perform multicast communication, and UE-4 214, UE-5 215, UE-6 216, and UE-7 217 form another group (Group B) to perform multicast communication. Each UE can perform multicast communication only within the group to which it belongs, and can perform communication with UEs existing in different groups by using unicast, multicast, or broadcast. Although in Figure 2 In (b), two groups (group A and group B) are formed, but the present disclosure is not limited thereto.

[0062] although Figure 2 Although not shown in the figure, the UE can perform broadcast communication in the SL. Broadcast communication refers to the situation where data and control information sent by the sending UE through the SL are received by all other terminals. For example, assuming that Figure 2 In (b), UE-1 211 is a transmitting UE for broadcast communication, and all UEs (UE-2 212, UE-3 213, UE-4 214, UE-5 215, UE-6 216 and UE-7 217) can receive data and control information sent by UE-1 211.

[0063] Unlike LTE V2X, NR V2X can consider the support type of vehicle UE sending data only to a specific node via unicast, and the support type of vehicle UE sending data to multiple specific nodes via multicast. For example, in service scenarios such as platooning, such unicast and multicast technologies may be useful, which is a technology that groups two or more vehicles and moves them in a group by connecting them via a network. Specifically, for the leader node of a group connected via platooning, unicast communication may be required to control one specific node, and for the leader node, multicast communication may be required to simultaneously control a group including multiple specific nodes.

[0064] Figure 3 A resource pool is shown according to an embodiment, which is defined as a resource set in time and frequency for side link transmission and reception. In the resource pool, the resource allocation unit (resource granularity) of the time axis may be a time slot. In addition, the resource allocation unit of the frequency axis may be a subchannel including one or more physical resource blocks (PRBs). In the present disclosure, an example of discontinuous allocation of resource pools on the time axis is described, but the resource pool may be continuously allocated on the time axis. Although an example of continuously allocating resource pools on the frequency axis is described, a method for discontinuously allocating resource pools on the frequency axis is not excluded in the present disclosure.

[0065] exist Figure 3 In FIG. 3 , a case 301 of discontinuously allocating resource pools on a time axis is shown. Figure 3 In the case where the resource allocation granularity on the time axis is composed of time slots. First, the SL time slot can be defined within the time slot used for UL. Specifically, the symbol length used for SL in a time slot can be configured in the SL bandwidth part (BWP) information. Therefore, among the time slots used for UL, the time slot in which the length of the symbol configured as SL is not guaranteed cannot be used as the SL time slot. In addition, the time slot in which the SL synchronization signal block (S-SSB) is sent is excluded from the time slots belonging to the resource pool. Referring to 301, in addition to such time slots, the set of time slots that can be used for SL on the time axis is shown as The shaded portion in 301 represents the SL time slots belonging to the resource pool. The SL time slots belonging to the resource pool can be (pre-)configured as resource pool information through a bitmap. Referring to 302, the SL time slot set belonging to the resource pool on the time axis is shown as The meaning of (pre) configuration used in this article may refer to configuration information that is pre-configured and then stored in the terminal, or may refer to a case where the terminal is configured by the base station in a cell-common manner. Here, cell-common may indicate that the terminals in the cell receive the same information configuration from the base station. In this case, the terminal may consider a method for receiving SL-SIB from the base station and obtaining cell-common information. In addition, (pre) configuration may refer to a case where the terminal is configured in a UE-specific manner after establishing an RRC connection with the base station. Here, "UE-specific" may be replaced with "UE-specific", and each terminal may be indicated to receive configuration information with a specific value. In this case, the terminal may consider a method for receiving an RRC message from a base station and obtaining UE-specific information. In addition, a method for performing (pre) configuration in resource pool information and a method for not performing (pre) configuration in resource pool information may be considered. When (pre) configuration is performed in resource pool information, all terminals operating in the corresponding resource pool, except for the terminal configured in a UE-specific manner after establishing an RRC connection with the base station, may operate according to the public configuration information. However, the method for not performing (pre-)configuration in the resource pool information is basically to perform (pre-)configuration independently of the resource pool configuration information. For example, one or more modes can be (pre-)configured in a resource pool (e.g., A, B, and C), and which (pre-)configured mode (e.g., A, B, or C) to use in the resource pool can be indicated by information (pre-)configured independently of the resource pool configuration information. In addition, in sidelink unicast transmission, the (pre-)configuration can be configured via PC5-RRC. Alternatively, a method for configuring the (pre-)configuration via MAC-CE can also be considered. Note that in the present disclosure, the execution of the (pre-)configuration can be applied to all of the above situations.

[0066] refer to Figure 3 303 in FIG. 3 shows a case where the resource pool is continuously allocated on the frequency axis. Resource allocation on the frequency axis can be configured in the SL BWP information and can be performed in the subchannel. A subchannel can be defined as a resource allocation unit including one or more PRBs on the frequency axis. That is, a subchannel can be defined as an integer multiple of a PRB. Figure 3In 303, the subchannel may be composed of 5 consecutive PRBs, and the size of the subchannel (sizeSubchannel) may be the size of 5 consecutive PRBs. However, the illustration of the accompanying drawings is only an example, the size of the subchannel may be configured differently, and a subchannel is generally composed of consecutive PRBs, but the subchannel is not necessarily composed of consecutive PRBs. The subchannel may be a basic unit of resource allocation for PSSCH. In 303, startRB-Subchannel may indicate the starting position of the subchannel in the resource pool on the frequency axis. When resource allocation on the frequency axis is performed in units of subchannels, resources on the frequency axis may be allocated based on the index of the resource block (RB) at the start of the subchannel (startRB-subchannel), information about the number of PRBs in a subchannel (sizeSubchannel), and configuration information about the total number of subchannels (numSubchannel). In this case, the information about startRB-Subchannel, sizeSubchannel, and numSubchannel may be (pre-)configured as frequency axis resource pool information.

[0067] As one of the methods for allocating transmission resources in SL, there is a method for allocating SL transmission resources from a base station to a terminal when the terminal is within the coverage of the base station. Hereinafter, this method is referred to as Mode 1. In other words, Mode 1 may be a method performed by a base station for allocating resources for SL transmission to an RRC-connected terminal in a dedicated scheduling scheme. Mode 1 enables the base station to manage the resources of the SL, making this effective in interference management and resource pool management. On the other hand, the method for allocating transmission resources in the SL includes allocating transmission resources by direct sensing by the terminal in the SL. Hereinafter, this method will be referred to as Mode 2. In the case of Mode 2, it may be referred to as UE autonomous resource selection. Unlike Mode 1 in which the base station directly participates in resource allocation, in Mode 2, the transmitting terminal autonomously selects resources through a sensing and resource selection procedure defined based on a (pre-) configured resource pool, and sends data through the selected resources. Next, when transmission resources are allocated through Mode 1 or Mode 2, the terminal can send / receive data and control information through the SL. The control information may include first-level sidelink control information (SCI) transmitted through a physical sidelink control channel (PSCCH). The first-level SCI may be referred to as SCI format 1-X. In addition, the control information may include second-level SCI transmitted through a physical sidelink shared channel (PSSCH). The second-level SCI may be referred to as SCI format 2-X. In SCI format 1-X and SCI format 2-X, X may be expressed as one or more different values ​​to distinguish different formats.

[0068] Next, a method for positioning using PRS sent through DL and UL of a terminal and a base station to measure the position of a terminal is described. In the present disclosure, the method using positioning signals sent through DL and UL of a terminal and a base station is referred to as radio access technology (RAT) related positioning. In addition, other positioning methods can be classified as RAT-independent positioning. Specifically, in the case of an LTE system, as a RAT-related positioning scheme, methods such as observed time difference of arrival (OTDOA), uplink time difference of arrival (UTDOA) and enhanced cell identification (E-CID) can be used. In NR systems, methods such as downlink time difference of arrival (DL-TDOA), downlink angle-of-departure (DL-AOD), multi-round trip time (multi-RTT), NR E-CID, uplink time difference of arrival (UL-TDOA) and uplink angle-of-arrival (UL-AOA) can be used. On the other hand, RAT-independent positioning solutions can include assisted global navigation satellite system (A-GNSS), sensors, wireless local area network (WLAN) and Bluetooth.

[0069] The present disclosure specifically focuses on RAT-related positioning methods supported by SL. In the case of the interface between the base station and the terminal (UL and DL, hereinafter referred to as Uu), RAT-related positioning is only available when the terminal is located within the coverage area of ​​the base station. However, it is noted that the RAT-related positioning of SL may not be limited to the case where the terminal is located within the coverage of the base station. For RAT-related positioning in Uu, positioning protocols such as LTE Positioning Protocol (LPP), LTE Positioning Protocol Annex (LPPa) and NR Positioning Protocol Annex (NRPPa) can be used. First, LPP can be a positioning protocol defined between the terminal and the location server (LS), and LPPa and NRPPa can be protocols defined between the base station and the LS. LS is an entity that manages location measurements and can perform location management functions (LMF). In addition, LS can be called LMF or other names. In both LTE systems and NR systems, LPP is supported, and positioning tasks including positioning capability exchange, auxiliary data transmission, location information transmission, error handling and termination can be performed through LPP.

[0070] The terminal and LS perform the above tasks through LPP, and note that the base station can perform the task of enabling the terminal and LS to exchange positioning information. In this case, the exchange of positioning information through LPP can be performed in a base station transparent manner. This may indicate that the base station is not involved in the exchange of positioning information between the terminal and the LS. In the exchange of positioning capabilities, the terminal can exchange supportable positioning information with the LS. For example, it may be whether the positioning method supported by the terminal is UE-assisted or UE-based, or whether both are possible. Here, UE-assisted positioning is a scheme in which the terminal only sends a measurement value for the positioning scheme to the LS based on the received positioning signal, without directly measuring the absolute position of the terminal, and the absolute position of the terminal is calculated by the LS. The absolute position may refer to two-dimensional coordinate position information (x, y) and three-dimensional coordinate position information (x, y, z) of the terminal based on longitude and latitude. On the other hand, UE-based positioning may be a scheme in which the terminal can directly measure the absolute position of the terminal, for which the terminal needs to receive the positioning signal together with the position information of the source of the positioning signal.

[0071] Although the LTE system only supports UE-assisted solutions, the NR system can support both UE-assisted positioning and UE-based positioning. In order to accurately measure the position of the terminal, auxiliary data transmission may be a very important factor in positioning. Specifically, in the case of auxiliary data transmission, the LS can provide the terminal with configuration information about the positioning signal, information about candidate cells and transmission reception points (TRP) for receiving positioning signals, etc. Specifically, when DL-TDOA is used, the information about candidate cells and TRPs for receiving positioning signals can be information about reference cells, reference TRPs, adjacent cells, and adjacent TRPs. In addition, multiple candidates for adjacent cells and adjacent TRPs can be provided together with information about preferred cells and TRPs to be selected by the terminal to measure positioning signals. In order for the terminal to accurately measure the position, it is necessary to appropriately select information about candidate cells and TRPs to be used as references. For example, when the channel for the positioning signal received from the corresponding candidate cell and TRP is a line-of-sight (LOS) channel, that is, a channel with fewer non-LOS (non-LOS, NLOS) channel components, the accuracy of the positioning measurement can be increased. Therefore, when the LS provides the terminal with information about candidate cells and TRP, that is, a reference for performing positioning by collecting various pieces of information, the terminal can perform more accurate positioning measurements.

[0072] The location information transmission can be performed through LPP. The LS can request location information from the terminal, and the terminal can provide the measured location information to the LS in response to the corresponding request. In the case of UE-assisted positioning, the location information can be a measurement value about a positioning scheme based on a received positioning signal. On the other hand, in UE-based positioning, the corresponding location information can be a two-dimensional coordinate position value (x, y) and a three-dimensional coordinate position value (x, y, z) of the terminal. When the LS requests location information from the terminal, the LS can include the required accuracy, response time, etc. in the positioning service quality (quality-of-service, QoS) information. According to the request including the positioning QoS information, the terminal needs to provide the measured location information to the LS to meet the corresponding accuracy and response time, and when it is impossible to meet the QoS, the terminal can consider error handling and termination. However, this is only an example, and in other cases other than the case where it is impossible to meet the QoS, error handling and termination can be performed on the positioning.

[0073] The positioning protocol defined between the base station and the LS is called LPP in the LTE system, and can perform functions including E-CID location information transmission, OTDOA information transmission, general error status reporting, and assistance information transmission between the base station and the LS.

[0074] The positioning protocol defined between the base station and the LS is called NRPPa in the NR system, and includes tasks performed by LPPa, and can additionally perform functions including positioning information transmission, measurement information transmission, and TRP information transmission between the base station and the LS.

[0075] Unlike in the LTE system, in the NR system, more positioning technologies are supported. Accordingly, various positioning schemes can be supported through the transmission of positioning information. For example, positioning measurements can be performed by the base station through the positioning sounding reference signal (SRS) sent by the terminal. Therefore, positioning information can be used to exchange information related to positioning SRS configuration and activation / deactivation between the base station and the LS. Measurement information transmission is a function of exchanging information related to multi-RTT, UL-TDOA and UL-AOA that are not supported in the LTE system between the base station and the LS. Finally, TRP information transmission is the task of exchanging information related to performing TRP-based positioning, because TRP-based positioning can be performed in the NR system, while cell-based positioning is performed in the LTE system.

[0076] An entity that performs positioning-related configuration and an entity that calculates positioning for measuring a terminal position in a SL may be classified into a UE (without LS), a LS (through a BS), and a LS (through a UE).

[0077] LS represents a location server, BS represents a base station such as a gNB or an eNB, and UE represents a terminal that performs transmission and reception through SL. As described above, the terminal that performs transmission and reception through SL may be a vehicle terminal or a pedestrian terminal. In addition, the terminal that performs transmission and reception through SL may include an RSU with a terminal function, an RSU with a base station function, or an RSU with some base station functions and some terminal functions. In addition, the terminal that performs transmission and reception through SL may include a positioning reference unit (PRU) with a known location. UE (without LS) represents a SL terminal that is not connected to LS. LS (through BS) represents a LS connected to a base station. In contrast, LS (through UE) represents a LS connected to a SL terminal. In other words, LS (through UE) represents a situation where LS is available even when the UE is not within the coverage of the base station. Here, LS (through UE) may be available only to certain terminals (such as RSU or PRU) other than general terminals. In addition, a terminal connected to LS through SL may be defined as a new type of device. In addition, only specific terminals that support the terminal capability of connecting to LS can perform the function of connecting to LS through SL.

[0078] In Table 1 below, Cases 1 to 9 indicate various combinations of entities that perform positioning-related configurations and entities that calculate positioning for measuring the terminal position on the SL. In the present disclosure, the terminal on which the position measurement needs to be performed is referred to as a target terminal. In addition, a terminal whose position is known and can provide a positioning signal for measuring the position of the target terminal is referred to as a positioning reference (PosRef) terminal. Therefore, the PosRef terminal can have its own location information, and the location information of the terminal can be provided together with the S-PRS. In other words, the PosRef terminal can be a terminal whose position is known. Note that the terms "target terminal" and "PosRef terminal" can be replaced with other terms. For example, the PosRef terminal can also be referred to as an anchor terminal. In addition, the positioning configuration can be classified into a UE configuration scheme and a network configuration scheme.

[0079] In Table 1 below, when the positioning configuration is UE (no LS), the UE configuration scheme can be applied. The advantage of the UE configuration scheme is that the positioning configuration can be performed even when the terminal is not located within the network (base station) coverage. When the positioning configuration is LS (through BS), it can correspond to the network configuration scheme. In the case of the network configuration scheme, the terminal is located within the network coverage. Since the positioning calculation and measurement information are reported to the base station, and then the position measurement of the target UE is performed by the LS connected to the base station, delays may occur due to the signaling related to the position measurement, but more accurate position measurement is possible. In addition, in Table 1, the case where the positioning configuration is LS (through UE) may not correspond to the network configuration scheme because the terminal does not operate within the network coverage through the base station. In addition, although the LS connected to the terminal provides configuration, it may not be classified as a UE configuration scheme when it is not classified as configured by the terminal. However, when it is classified as configured by the terminal, it can be classified as a UE configuration scheme. Accordingly, in the case of LS (through UE), it can be referred to as a scheme other than the UE configuration scheme or the network configuration scheme.

[0080] In addition, as described above, the positioning calculation can be classified into two schemes, namely, the UE-assisted scheme and the UE-based scheme. In Table 1, the case where the positioning calculation is UE (without LS) can correspond to the UE-based scheme, and the case where the positioning calculation is LS (through BS) or LS (through UE) can generally correspond to the UE-assisted scheme. However, when the positioning calculation is LS (through UE) and the corresponding LS is interpreted to the terminal, LS (through UE) can also be classified as a UE-based scheme.

[0081] [Table 1]

[0082]

[0083]

[0084] In Table 1, the positioning configuration information may include S-PRS configuration information. The S-PRS configuration information may be pattern information of the S-PRS and information related to the time / frequency transmission position. In addition, in Table 1, the positioning calculation may be performed by the terminal receiving the S-PRS and performing measurements based on the received S-PRS, and the positioning measurement and calculation methods may vary depending on which positioning method is applied. The measurement of the position information in the SL may be absolute positioning to provide a two-dimensional coordinate position value (x, y) and a three-dimensional coordinate position value (x, y, z) of the terminal, or relative positioning to provide relative two-dimensional or three-dimensional position information from another terminal. In addition, the position information in the SL may be ranging information, including one of a distance or direction to another terminal. When the meaning of ranging in the SL includes both distance information and direction information, ranging may have the same meaning as relative positioning. In addition, as positioning methods, side link arrival time difference (SL-TDOA), side link departure angle (SL-AOD), side link multi-round trip time (SL multi-RTT), side link round trip time (SL RTT), SL E-CID, side link arrival angle (SL-AOA), etc. can be considered.

[0085] Figure 4 The method for calculating the terminal position through SL according to the embodiment is shown. However, in the present disclosure, the case where the terminal position is calculated through SL is not limited to Figures 4 to 6 The situation shown. Figures 4 to 6 The signaling of the positioning configuration information in is shown as a black dashed line. The transmission of S-PRS is shown as a light blue dashed line. Note that in the case of S-PRS transmission, it can be done in both directions or in one direction. The transmission of measured information for positioning or measured positioning information is shown as a red dashed line. Finally, the transmission of location information known to the terminal (known location) is shown as a blue dashed line.

[0086] Figure 4 Part (a) in FIG. 1 shows an example in which an SL terminal that is not connected to the LS provides a positioning configuration and a target terminal that is not connected to the LS performs a positioning calculation. This may correspond to Case 1 in Table 1. In this case, the positioning-related configuration information may be indicated by the SL in a broadcast, unicast, or multicast from the target terminal to another terminal. In addition, the target terminal may perform a positioning calculation based on the provided positioning signal.

[0087] Figure 4Part (b) in shows an example in which a SL terminal that is not connected to the LS provides a positioning configuration, the target terminal is located within the network coverage, and therefore the LS connected to the base station performs a positioning calculation. This may correspond to case 2 in Table 1. In this case, the positioning-related configuration information may be indicated by the SL in a broadcast, unicast, or multicast from the target terminal to another terminal. In addition, the target terminal performs positioning measurements based on the provided positioning signal, and reports the measured positioning information to the base station because the target terminal is located within the coverage of the base station. Then, the corresponding measurement information may be reported to the LS connected to the base station, so that the LS can perform positioning calculations.

[0088] Figure 4 Part (c) in shows an example in which an SL terminal not connected to the LS provides positioning configuration and the LS performs positioning calculations through the SL terminal connected to the LS. This may correspond to Case 3 in Table 1. In this case, the positioning-related configuration information may be indicated by the SL in a broadcast, unicast, or multicast from the target terminal to another terminal. In addition, the target terminal performs positioning measurements based on the provided positioning signal, and reports the measured positioning information to the terminal connected to the LS, because the target terminal is located within the SL coverage of the terminal connected to the LS. Figure 4 In part (c), it is shown that the terminal connected to the LS is a PosRef UE (RSU), but it is noted that the terminal may be a terminal different from the RSU. Then, the corresponding measurement information may be reported to the LS connected to the PosRef UE (RSU), so that the LS may perform positioning calculations.

[0089] Figure 5 A method of calculating a terminal position through SL according to an embodiment is shown. Figure 5 Part (a) in Figure 1 shows an example in which the SL terminal is located within the network coverage, the LS connected to the base station provides the positioning configuration, and the target terminal not connected to the LS performs the positioning calculation. This may correspond to case 4 in Table 1. In this case, the positioning configuration information may be provided by the LS connected to the base station using a positioning protocol such as LPP. In addition, the target terminal may perform the positioning calculation based on the provided configuration information and the positioning signal.

[0090] Figure 5Part (b) in shows an example in which the SL terminal is located within the network coverage, the LS connected to the base station provides the positioning configuration, the target terminal is located within the network coverage, and the LS connected to the base station performs the positioning calculation. This may correspond to Case 5 in Table 1. In this case, the positioning configuration information may be provided by the LS connected to the base station using a positioning protocol such as LPP. In addition, the target terminal performs positioning measurements based on the provided configuration information and the positioning signal, and reports the measured positioning information to the base station because the target terminal is located within the coverage of the base station. The corresponding measurement information may then be reported to the LS connected to the base station, so that the LS can perform the positioning calculation.

[0091] Figure 5 Part (c) in shows an example in which the SL terminal is located within the network coverage, the LS connected to the base station provides the positioning configuration, and the LS performs the positioning calculation through the SL terminal connected to the LS. This may correspond to Case 6 in Table 1. In this case, the positioning configuration information may be provided by the LS connected to the base station using a positioning protocol such as LPP. In addition, the target terminal performs positioning measurements based on the provided configuration information and the positioning signal, and reports the measured positioning information to the terminal connected to the LS, because the target terminal is located within the SL coverage of the terminal connected to the LS. Figure 5 In part (c), the terminal connected to the LS is shown as a PosRef UE (RSU), but it should be noted that the terminal may be a terminal other than an RSU. Then, the corresponding measurement information may be reported to the LS connected to the PosRef UE (RSU), so that the LS may perform positioning calculations.

[0092] Figure 6 A method of calculating a terminal location through SL according to an embodiment is shown. Figure 6 Part (a) in FIG. 1 shows an example in which the LS provides positioning configuration through the SL terminal connected to the LS and the target terminal not connected to the LS performs positioning calculation. This may correspond to case 7 in Table 1. In this case, the LS connected to the terminal may provide positioning configuration information by using a positioning protocol such as LPP. In addition, the target terminal may perform positioning calculation based on the provided configuration information and positioning signal.

[0093] Figure 6Part (b) in shows an example in which the LS provides positioning configuration through the SL terminal connected to the LS, the target terminal is located within the network coverage, and the LS connected to the base station performs positioning calculations. This may correspond to case 8 in Table 1. In this case, the LS connected to the terminal may provide positioning configuration information by using a positioning protocol such as LPP. In addition, the target terminal may perform positioning calculations based on the provided configuration information and positioning signals, and report the measured positioning information to the base station because the target terminal is located within the coverage of the base station. Then, the corresponding measurement information may be reported to the LS connected to the base station, so that the LS may perform positioning calculations.

[0094] Figure 6 Part (c) in shows an example in which the LS provides positioning configuration through an SL terminal connected to the LS and the LS performs positioning calculations through an SL terminal connected to the LS. This may correspond to Case 9 in Table 1. In this case, the LS connected to the terminal may provide positioning configuration information by using a positioning protocol such as LPP. In addition, the target terminal performs positioning measurements based on the provided configuration information and positioning signals, and reports the measured positioning information to the terminal connected to the LS, because the target terminal is located within the SL coverage of the terminal connected to the LS. Figure 6 In part (c), the terminal connected to the LS is shown as PosRef UE (RSU), and it is noted that the terminal may be a terminal other than the RSU. Then, the corresponding measurement information may be reported to the LS connected to the PosRef UE (RSU), so that the LS may perform positioning calculations.

[0095] Figure 7 A method for performing positioning using an RTT scheme according to an embodiment is shown. Figure 7 In , UE-A and UE-B may correspond to the target terminal and the PosRef terminal respectively. Figure 7 In the example, UE-A and UE-B are not limited to the target UE and PosRef UE, respectively. In other words, UE-A may correspond to the PosRef terminal, and UE-B may correspond to the target terminal. Figure 7 A method in which a target terminal performs RTT with one PosRef terminal as a pair (single RTT) is shown. However, the target terminal may perform RTT with multiple PosRef terminals. In this case, Figure 7Different, there can be multiple pairs between the target terminal and one PosRef terminal, and the method can be named multi-RTT. For the target device, multiple RTTs may be required to perform absolute positioning. The terminal can use the RTT scheme to calculate the time of flight (ToF), and use the relational expression "speed = time / distance" or "distance = speed × time" or "time = distance / speed" to measure the distance. TToF means time, and the speed of light can be applied to the speed.

[0096] Figure 7 Part (a) of FIG. 1 shows a one-sided RTT scheme. According to the one-sided RTT, when UE-A sends a positioning signal to UE-B, and UE-B sends a positioning signal to UE-A, RTT measurement can be performed, such as Figure 7 Specifically, UE-A can calculate T round 701, T round 701 is the difference between the time when the positioning signal is sent to UE-B and the time when the positioning signal is received from UE-B. UE-B can calculate T reply 702, T reply 702 is the difference between the time when the positioning signal is received from UE-B and the time when the positioning signal is sent to UE-B. From this, the terminal will be able to calculate the time of flight (ToF) as shown in the following equation (1).

[0097] ToF = 1 / 2 (T round –T reply )…(1)

[0098] In order for UE-A to calculate equation (1), it is necessary to indicate to UE-A the T calculated by UE-B. reply In order for UE-B to calculate equation (1), it is necessary to indicate to UE-B the T calculated by UE-A. round For details on indicating corresponding information, refer to the fourth embodiment below.

[0099] Figure 7 Part (b) of FIG. 1 shows a two-sided RTT solution. According to the two-sided RTT, Figure 7 As shown in part (b) of , when UE-A sends a positioning signal to UE-B, UE-B sends a positioning signal to UE-A, and UE-A sends a positioning signal to UE-B again, RTT measurement can be performed. Specifically, UE-A can calculate T round1 701, T round1 701 is the difference between the time when the positioning signal is sent to UE-B and the time when the positioning signal is received from UE-B. UE-B can calculate T reply1 702, Treply1 702 is the difference between the time when the positioning signal is received from UE-B and the time when the positioning signal is sent to UE-B. Next, based on this, UE-A can calculate T reply2 703,T reply2 703 is the difference between the time when the positioning signal is received from UE-B and the time when the second positioning signal is sent to UE-B. UE-B can calculate T round2 704,T round2 704 is the difference between the time when the positioning signal is sent to UE-A and the time when the second positioning signal is received from UE-B. From this, the terminal will be able to calculate the time of flight (ToF) as shown in equation (2) below.

[0100] ToF=(T round1 x T round2 –T reply1 x T reply2 ) / (T round1 +T round2 +T reply1 +T reply2 )…(2)

[0101] In order for UE-A to calculate equation (2), it is necessary to indicate to UE-A the T calculated by UE-B. reply1 and T round2 In order for UE-B to calculate equation 2, it is necessary to indicate to UE-B the T calculated by UE-A. round1 and T reply2 Information. For details on indicating corresponding information, refer to the fifth embodiment below. Compared with the one-sided RTT according to equation 1, in the case of the two-sided RTT according to equation (2), the effect of clock drift in each terminal is minimized, thereby improving positioning accuracy. However, additional signal exchange may occur, resulting in additional delay in calculating ToF. In the present disclosure, the method for using RTT by the UE is not limited to the above two methods. In other words, the terminal can reply2 and T round2 T is then calculated via additional positioning signal exchange. reply and T round To calculate ToF.

[0102] Note that in the present disclosure, one or more of the following embodiments may be used in combination with each other. The present disclosure proposes a method for generating a pseudo-random based sequence and a ZC based S-PRS sequence taking into account the SL environment. In addition, the present disclosure proposes an S-PRS pattern based on these sequences. Specifically, the present disclosure proposes in which symbol of the SL time slot the S-PRS can be sent, in which RE on the frequency axis the S-PRS can be sent, and how the S-PRS can be multiplexed with other channels and signals. In addition, the present disclosure proposes parameters required for the transmission of the S-PRS and a method for configuring these parameters. In addition, the present disclosure proposes a terminal operation according to the above.

[0103] <First Embodiment>

[0104] The first embodiment discloses a method for generating a pseudo-random S-PRS sequence in consideration of a SL environment. Specifically, the first embodiment discloses a method for determining parameters required for generating a pseudo-random S-PRS sequence in consideration of a SL environment. In SL, it may happen that the terminal is within the coverage of the base station and that the terminal is outside the coverage of the base station. Therefore, it is necessary to determine a method for determining specific parameters regardless of whether the terminal is within or outside the coverage. For example, a method for a base station to determine and indicate specific parameters can only be used when the terminal is within the coverage, and therefore cannot be used when the terminal is outside the coverage of the base station.

[0105] The pseudo-random sequence is defined based on the Gold sequence of length 31 and the length is M PN The pseudo-random sequence c(n) can be defined as follows:

[0106] c(n)=(x 1 (n+N c )+x 2 (n+N c ))mod2

[0107] x 1 (n+31)=(x 1 (n+3)+x 1 (n))mod2

[0108] x 2 (n+31)=(x 2 (n+3)+x 2 (n+2)+x 2 (n+1))mod2…(3)

[0109] In equation (3), N c =1600, and the first m sequence x1 (n) will be initialized to x 1 (0) = 1, x 1 (n) = 0, n = 1, 2, ..., 30. The second m-sequence x 2 The initialization of (n) can be expressed as And the corresponding value can be determined by the application of the sequence. Initialization can be performed.

[0110] Specifically, the pseudo-random based S-PRS sequence can be defined in the following equation (4).

[0111]

[0112] In equation (4), c(i) is given in equation (3), and the pseudo-random sequence may be initialized according to equations (5), (6), and (7) below. In the present disclosure, the initialization method may not be limited to equations (5), (6), and (57). In equations (5), (6), and (7) below, it is assumed that 4096 S-PRS sequence IDs (N ID ∈{0,1,…,4095}). However, in the present disclosure, the number of S-PRS sequence IDs may not be limited to a specific value.

[0113]

[0114] In equations (5), (6) and (7), for a normal cyclic prefix, is 14, and for the extended cyclic prefix, It's 12. represents the time slot number in the frame, and l represents the OFDM symbol number. The present disclosure proposes a method for determining N in the above equation ID (S-PRS sequence ID). The method used in the present disclosure to determine N ID The method may not be limited to the following method. In addition, one or more of the following methods may be used in combination. In addition, one or more of the following methods are supported, and which method is used may be (pre-)configured.

[0115] To determine N ID (S-PRS Sequence ID) method

[0116] In determining N ID When, in method 1, N ID is determined by the

[12] LSB of the CRC of the corresponding 1st SCI. In method 2, N ID It is determined by the

[12] LSB of the destination ID carried in the 1st SCI or 2nd SCI. In method 3, N IDIt is determined by the [8] bits + [4] zero bits of the source ID carried in the 1st SCI or the 2nd SCI. In method 4, N ID is determined by the (pre)configured value. In method 5, N ID is determined to be a fixed value (ie, zero); in method 6, N ID It is determined by bit

[12] in the 1st SCI or 2nd SCI.

[0117] In method 1, it is assumed that the PSCCH (i.e., the 1st SCI) is transmitted in the time slot in which the S-PRS is transmitted. However, if the PSCCH is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to operate based on the most recently transmitted PSCCH (i.e., the 1st SCI). According to method 1, it may be determined here, L = 24, the value p represents the parity bit p used for the CRC calculation of PSCCH 0 、p 1 、p 2 、p 3 ,……,p L-1 , and can be generated by a cyclic generator polynomial. In method 1, it is assumed that 4096 S-PRS sequence IDs are used and

[12] bits of information are used, but in the present disclosure, the number of S-PRS sequence IDs is not limited to a specific value. When 2 Y When there are S-PRS sequence IDs, determine

[0118] In method 2, it is assumed that the PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted. In addition, it is assumed that the destination ID is included in the 1st SCI or the 2nd SCI. It is assumed that the destination ID is 16 bits. However, in the present disclosure, the destination ID is not limited to 16 bits. If the 1st SCI or the 2nd SCI is not transmitted in every time slot in which the S-PRS is transmitted, it can be considered to perform an operation based on the destination ID included in the most recently transmitted 1st SCI or 2nd SCI. In method 2, it is assumed that 4096 S-PRS sequence IDs are used and

[12] bits of information are used, but in the present disclosure, the number of S-PRS sequence IDs is not limited to a specific value. When 2 Y When there are 1 S-PRS sequence IDs, assuming Y≤16, the

[12] bits can be replaced by Y bits.

[0119] In method 3, it is assumed that PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted. In addition, it is assumed that the source ID is included in the 1st SCI or the 2nd SCI. It is assumed that the source ID is 8 bits. However, in the present disclosure, the source ID is not limited to 8 bits. If the 1st SCI or the 2nd SCI is not transmitted in each time slot in which the S-PRS is transmitted, it can be considered to perform an operation based on the source ID included in the most recently transmitted 1st SCI or the 2nd SCI. In method 3, it is assumed that 4096 S-PRS sequence IDs are used and 12 bits of information are required. However, in the present disclosure, the number of S-PRS sequence IDs is not limited to a specific value. The number of required zero bits may vary depending on the number of required bits of the source ID and the number of bits of the S-PRS sequence ID.

[0120] In Methods 4 and 5, N ID (S-PRS sequence ID) is (pre-)configured or fixed to a specific value, and it may be difficult to convert N to a specific value according to these methods. ID Randomization.

[0121] In method 6, N is indicated by the first SCI or the second SCI alone. ID (S-PRS sequence ID), and the terminal can arbitrarily select and determine the corresponding value. Method 6 assumes that 4096 S-PRS sequence IDs are used and requires 12 bits of information. However, in the present disclosure, the number of S-PRS sequence IDs is not limited to a specific value.

[0122] <Second Embodiment>

[0123] The second embodiment discloses a method for generating a ZC-based S-PRS sequence in consideration of a SL environment. Specifically, the second embodiment discloses a method for determining parameters required for generating a ZC-based S-PRS sequence in consideration of a SL environment. In SL, it may happen that the terminal is within the coverage of the base station and that the terminal is outside the coverage of the base station. Therefore, it is necessary to determine a method for determining specific parameters regardless of whether the terminal is within or outside the coverage. For example, a method for a base station to determine and indicate specific parameters can only be used when the terminal is within the coverage, and therefore cannot be used when the terminal is outside the coverage of the base station.

[0124] First, by the length M ZC , cyclic shift α and base sequence Defined ZC sequence It can be defined as in the following equations (8) and (9).

[0125]

[0126] Details about equation (8) can be found in the corresponding standard specification.

[0127] Specifically, the ZC-based S-PRS sequence may be defined as in the following equation (9).

[0128]

[0129] In equation (9), is the symbol length of the S-PRS, and the following content can be considered as a method for determining the corresponding symbol length value. In the present disclosure, The value of may not be limited to a specific value. In addition, the method for determining the symbol length of the S-PRS is not limited to the method given below. In addition, one or more of the following methods may be used in combination. In addition, one or more of the following methods may be supported, and (pre-) configuration of which method to use may be performed.

[0130] To determine (S-PRS symbol length) method

[0131] In determining Method 1 specifies that a specific value is fixed; Method 2 specifies that one or more values ​​are supported and one value is (pre-)configured; Method 3 specifies that one or more values ​​are supported and more than one value can be (pre-)configured.

[0132] When one or more values ​​are supported or one or more values ​​are (pre) configured, the terminal can select a value and indicate the selected value to other terminals. In this case, various methods such as the 1st SCI, the 2nd SCI, the SL MAC-CE, the PC5-RRC, etc. can be used to indicate the corresponding value.

[0133] Equation 9 can be calculated as δ = log 2 (K TC ), and K TC represents the comb pattern on the frequency axis of S-PRS. K TC ∈{2,4,8}, and the following can be considered as a method for determining K TC In the present disclosure, K TC The value of is not limited to 2, 4, or 8. For example, K TC =1. Specifically, K TC = 1 indicates that S-PRS is sent to all REs. TCThe method is not limited to the method given below. In addition, one or more of the following methods can be used in combination. In addition, one or more of the following methods can be supported, and (pre-) configuration of which method to use can be performed.

[0134] To determine K TC Methods

[0135] In determining K TC In method 1, a value is (pre)configured; in method 2, the available K is (pre)configured TC Range of values; in method 3, when one or more values ​​are configured, the terminal may select a value and indicate the selected value to the other terminal.

[0136] Various methods such as 1st SCI, 2nd SCI, SL MAC-CE, PC5-RRC, etc. can be used to indicate the corresponding value.

[0137] C that can be used in method 2 PRS The range of values ​​may be determined by the priority of the terminal and the channel busy ratio (CBR).

[0138] In equation (9), for antenna port p i The cyclic shift α i The value of can be determined in the following equation (10).

[0139]

[0140] in

[0141]

[0142] In equation (10), X represents the lowest antenna port value for S-PRS, and for example, when the corresponding value is 6000, it may be X=6000. is the cyclic shift value and can be determined here, Refer to Table 2 below.

[0143] [Table 2]

[0144]

[0145] A method for determining In the present disclosure, the method for determining The method may not be limited to the following method. In addition, one or more of the following methods may be used in combination. In addition, one or more of the following methods are supported, and (pre-) configuration of which method to use may be performed.

[0146] To determine Methods

[0147] In determining In method 1, The CRC of the corresponding 1st SCI The bit is determined by the LSB; in method 2, The destination ID carried in the 1st SCI or 2nd SCI bit LSB determined; in method 3, The source ID carried in the 1st SCI or 2nd SCI bit is determined; in method 4, is determined by the (pre)configured value; in method 5, is determined to be a fixed value (ie, zero); in method 6, Is from the 1st SCI or 2nd SCI Position determined.

[0148] In method 1, it is assumed that the PSCCH (i.e., the 1st SCI) is transmitted in the time slot in which the S-PRS is transmitted. However, if the PSCCH is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the most recently transmitted PSCCH (i.e., the 1st SCI). According to method 1, it may be determined here, And the value p represents the parity bit p used to calculate the CRC of PSCCH 0 、p 1 、p 2 、p 3 ,……,p L-1 , and can be generated by a cycle generator polynomial.

[0149] In method 2, it is assumed that the PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted. In addition, it is assumed that the destination ID is included in the 1st SCI or the 2nd SCI. It is assumed that the destination ID is 16 bits. However, in the present disclosure, the destination ID is not limited to 16 bits. If the 1st SCI or the 2nd SCI is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the destination ID included in the most recently transmitted 1st SCI or the 2nd SCI.

[0150] In method 3, it is assumed that the PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted. In addition, it is assumed that the source ID is included in the 1st SCI or the 2nd SCI. It is assumed that the source ID is 8 bits. However, in the present disclosure, the source ID is not limited to 8 bits. If the 1st SCI or the 2nd SCI is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the source ID included in the most recently transmitted 1st SCI or the 2nd SCI.

[0151] In Method 4 and Method 5, is (pre)configured or fixed to a specific value and is Difficulties may arise during randomization. In method 6, the first SCI or the second SCI alone indicates And the terminal can arbitrarily select and determine the corresponding value.

[0152] A method for determining the sequence group u and the sequence number v in equation (9) is given. The sequence group u can be determined by the following equation (11).

[0153]

[0154] In equation (11), is the equation for performing group hopping, and its details will be discussed again below. In the above equation, is the S-PRS sequence ID, and a method for determining the S-PRS sequence ID is given below. The method may not be limited to the following method.

[0155] To determine Method (S-PRS sequence ID)

[0156] In determining In method 1, It is determined by the

[16] -bit LSB of the CRC of the corresponding 1st SCI.

[0157] In method 2, It is determined by the

[16] -bit destination ID carried in the 1st SCI or 2nd SCI. In method 3, It is determined by the [8] bits + [8] zero bits of the source ID carried in the 1st SCI or the 2nd SCI. In method 4, is determined by the (pre)configured value. In method 5, is determined to be a fixed value (ie, zero).

[0158] In method 6, It is determined by bit

[16] in the 1st SCI or 2nd SCI.

[0159] In method 1, it is assumed that the PSCCH (i.e., the 1st SCI) is transmitted in the time slot in which the S-PRS is transmitted. However, if the PSCCH is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the most recently transmitted PSCCH (i.e., the 1st SCI). In method 1, it may be determined here, And the value p represents the parity bit p used for the CRC calculation of PSCCH 0 、p 1 、p 2 、p 3 ,……,p L-1 , and can be generated by a cyclic generator polynomial. In method 1, it is assumed that 65536 S-PRS sequence IDs are used and

[16] bits of information are used, but in the present disclosure, the number of S-PRS sequence IDs is not limited to a specific value. When 2 Y When there are S-PRS sequence IDs, it can be determined

[0160] In method 2, it is assumed that the PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted. In addition, it is assumed that the destination ID is included in the 1st SCI or the 2nd SCI. It is assumed that the destination ID is 16 bits. However, in the present disclosure, the destination ID is not limited to 16 bits. If the 1st SCI or the 2nd SCI is not transmitted in every time slot in which the S-PRS is transmitted, it can be considered to perform an operation based on the destination ID included in the most recently transmitted 1st SCI or 2nd SCI. In method 2, it is assumed that 65536 S-PRS sequence IDs are used and 16 bits of information are used, but in the present disclosure, the number of S-PRS sequence IDs is not limited to a specific value. When less than 16 bits of S-PRS sequence ID information is required and the destination ID uses 16 bits, the LSB of the destination ID can be used.

[0161] In method 3, it is assumed that PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted. In addition, it is assumed that the source ID is included in the 1st SCI or the 2nd SCI. It is assumed that the source ID is 8 bits. However, in the present disclosure, the source ID is not limited to 8 bits. If the 1st SCI or the 2nd SCI is not transmitted in each time slot in which the S-PRS is transmitted, it can be considered to perform an operation based on the source ID included in the most recently transmitted 1st SCI or the 2nd SCI. In method 3, it is assumed that 65536 S-PRS sequence IDs are used and 16 bits of information are required. However, in the present disclosure, the number of S-PRS sequence IDs is not limited to a specific value. The number of required zero bits may vary depending on the number of required bits of the source ID and the number of bits of the S-PRS sequence ID.

[0162] In Methods 4 and 5, N ID (S-PRS sequence ID) is (pre)configured or fixed to a specific value, so when N ID Difficulties may arise during randomization. In method 6, (S-PRS sequence ID) indicates N separately through the first SCI or the second SCI. ID , and the terminal can arbitrarily select and determine the corresponding value. In method 3, it is assumed that 65536 S-PRS sequence IDs are used and 16 bits of information are required. However, in the present disclosure, the number of S-PRS sequence IDs is not limited to a specific value.

[0163] In addition, a method for determining the sequence group u and the sequence number v in equation (9) can be determined according to whether group jumping and sequence jumping are performed, and the following method is given as a method for determining whether group jumping and sequence jumping are performed. In the present disclosure, the method for determining whether group jumping and sequence jumping are performed may not be limited to the following method. In addition, one or more of the following methods may be used in combination. In addition, one or more of the following methods may be supported, and (pre-) configuration of which method to use may be performed.

[0164] Method for determining group hopping and sequence hopping

[0165] When determining group hopping and sequence hopping, in method 1, the determination is fixed as a specific method; in method 2, the determination is (pre-)configured.

[0166] For example, in method 1, one of {"neither", "group hopping", "sequence hopping"} can be selected and fixed, or according to method 2, one of {"neither", "group hopping", "sequence hopping"} can be used for (pre-)configuration.

[0167] In the case of "neither", neither group jumping nor sequence jumping is performed, and can be expressed by the following equation (12).

[0168]

[0169] In the case of "group hopping", only group hopping is performed without sequence hopping, and this case can be expressed by the following equation (13).

[0170]

[0171] In equation (13), c(i) is the pseudo-random sequence given in equation (3), and the corresponding value can be initialized as And The determination of is referred to as the above given for determining (S-PRS sequence ID) method.

[0172] In the case of "sequence hopping", only sequence hopping is performed without group hopping, and this case can be expressed by the following equation (14).

[0173]

[0174] In equation (14), c(i) is the pseudo-random sequence given in equation (3), and the corresponding value can be initialized as And The determination of is referred to as the above given for determining (S-PRS sequence ID) method. Equation (15) is presented as follows.

[0175]

[0176] In equation (15), In equation (10), m can be selected from the following table: PRS,b The value of m is used as the value for determining the bandwidth through which the S-PRS is transmitted. However, in the present disclosure, m PRS,b The value of is not limited to the value shown in the following Table 2. In other words, depending on the bandwidth over which the S-PRS is transmitted, m shown in the following Table 2 may not be used. PRS,b A specific value of m may be used, or a new value not shown in Table 2 below may be used. PRS,b The value of b can be determined as b = B PRS and B PRS ∈{0,1,2,3}. PRS is a parameter that determines how the PRS jumps on the frequency axis, and the following content can be considered as a method for determining the corresponding value. PRSThe value of is not limited to 0, 1, 2, 3. PRS The method is not limited to the method given below. One or more of the following methods can be used in combination and can be supported and (pre-)configured.

[0177] To determine B PRS Methods

[0178] In determining B PRS When, in method 1, B PRS is fixed to a specific value; in method 2, a value is (pre-)configured.

[0179] For example, in method 1, B PRS =0, can always be fixed. Alternatively, according to method 2, B PRS ∈{0,1,2,3} to (pre) configure. In order to determine the m in Table 3 below PRS,b The value of C PRS ∈{0,1,…,63}. The following can be considered as the value for determining C PRS In the present disclosure, C PRS The value of is 0, 1, 2, ..., 63, but not limited thereto.

[0180] To determine C PRS Methods

[0181] In determining C PRS When the method 1 specifies (pre-) configuration of a value; the method 2 specifies (pre-) configuration of available C PRS Range of values; Method 3 specifies that when one or more values ​​are configured, the terminal may select a value and indicate the selected value to another terminal.

[0182] Various methods such as 1st SCI, 2nd SCI, SL MAC-CE, PC5-RRC, etc. can be used to indicate the corresponding value.

[0183] C that can be used in method 2 PRS The range of values ​​may be determined by the priority of the terminal and the channel occupancy rate (CBR). Table 3 is presented as follows.

[0184] [Table 3]

[0185]

[0186]

[0187]

[0188] In order to determine K in equation (15) TC , P FThe value of is determined to be 1, 2, or 4. F When the value of is determined to be 2 or 4, the terminal may estimate that the length of the S-PRS sequence is a multiple of 6. However, in the present disclosure, P F The value of may not be limited to 1, 2 or 4.

[0189] To determine P F Methods

[0190] In determining P F When, in method 1, P F is fixed to a specific value; in method 2, a value is (pre-)configured.

[0191] For example, in method 1, one of 1, 2, and 4 may be selected and fixed. Alternatively, according to method 2, (pre-) configuration may be performed using one of 1, 2, and 4.

[0192] <Third Embodiment>

[0193] The third embodiment provides a method for configuring and sending a signal for a terminal to measure a position through a SL.

[0194] Whether the terminal can perform positioning through SL (in other words, whether the terminal is a terminal capable of performing positioning operations) is determined by the terminal capability, and the corresponding capability information can be sent to other terminals and base stations. In this case, whether the terminal can perform positioning through SL can be determined by whether the SL positioning signal is sent / received. The SL positioning signal may be an S-PRS sent and received for positioning measurement. For example, a specific SL terminal can perform both the sending and receiving of S-PRS. In addition, a specific SL terminal can perform S-PRS sending, but there may be a terminal that cannot perform S-PRS reception. In addition, a specific SL terminal can perform S-PRS reception, but there may be a terminal that cannot perform S-PRS sending. In addition, a specific SL terminal may not be able to perform both the sending and receiving of S-PRS. Whether such a terminal can send / receive S-PRS can be defined as a terminal capability. In the present disclosure, the S-PRS signal is not limited to a specific signal. For example, the corresponding signal may be an SL synchronization signal or another reference signal defined in the SL. Alternatively, the corresponding signal may be a newly defined reference signal for SL positioning.

[0195] Figure 8 A method of considering reusing a DL PRS-based pattern in an S-PRS according to an embodiment is shown. Figure 8 In part (a), the comb pattern and number of PRS symbols supported in the DL PRS can be reused as the S-PRS. Specifically, Figure 8The S-PRS pattern for Comb-2 and the number of PRS symbols = 2 is shown in part (b) of FIG. Figure 8 The S-PRS pattern for Comb-2 and the number of PRS symbols = 4 is shown in part (c) of FIG. Figure 8 The S-PRS pattern for Comb-2 and the number of PRS symbols = 6 is shown in part (d) of FIG. Figure 8 The S-PRS pattern for Comb-2 and the number of PRS symbols = 12 is shown in part (e) of FIG. Figure 8 The S-PRS pattern for Comb-4 and the number of PRS symbols = 4 is shown in part (f) of FIG. Figure 8 The S-PRS pattern for Comb-4 and the number of PRS symbols = 12 is shown in part (g) of FIG. Figure 8 The S-PRS pattern for Comb-6 and the number of PRS symbols = 6 is shown in part (h) of FIG. Figure 8 The S-PRS pattern for Comb-6 and the number of PRS symbols = 12 is shown in part (i) of FIG. Figure 8 The S-PRS pattern for Comb-12 and the number of PRS symbols = 12 is shown in part (j) of FIG. Figure 8 , the S-PRS can have various symbol lengths, and the starting position and length of the symbol through which the S-PRS is transmitted can be flexibly determined in the time slot. In the present disclosure, the S-PRS pattern is not limited to Figure 8 The pattern shown.

[0196] Fig. 9 A method is shown that considers reusing a UL SRS-based pattern in S-PRS. Fig. 9 In part (a), the comb pattern and number of PRS symbols supported in the UL SRS can be reused as the S-PRS. Specifically, Fig. 9 The S-PRS pattern for Comb-2 and the number of PRS symbols=1 is shown in part (b) of FIG. Fig. 9 The S-PRS pattern for Comb-2 and the number of PRS symbols = 2 is shown in part (c) of FIG. Fig. 9 The S-PRS pattern for Comb-2 and the number of PRS symbols = 4 is shown in part (d) of FIG. Fig. 9 The S-PRS pattern for Comb-4 and the number of PRS symbols = 2 is shown in part (e) of FIG. Fig. 9 The S-PRS pattern for Comb-4 and the number of PRS symbols = 4 is shown in part (f) of FIG. Fig. 9 The S-PRS pattern for Comb-4 and the number of PRS symbols = 8 is shown in part (g) of FIG. Fig. 9The S-PRS pattern for Comb-4 and the number of PRS symbols = 12 is shown in part (h) of FIG. Fig. 9 The S-PRS pattern for Comb-8 and the number of PRS symbols = 4 is shown in part (i) of FIG. Fig. 9 The S-PRS pattern for Comb-8 and the number of PRS symbols = 8 is shown in part (j) of FIG. Fig. 9 The S-PRS pattern for Comb-8 and the number of PRS symbols = 12 is shown in part (k) of FIG. Fig. 9 , the S-PRS can have various symbol lengths, and the starting position and length of the symbol through which the S-PRS is transmitted can be flexibly determined in the time slot. In the present disclosure, the S-PRS pattern is not limited to Fig. 9 The pattern shown.

[0197] Fig.10 is a method considering using a Comb-1 pattern for S-PRS according to an embodiment. Fig.10 In the case of Comb-1 and the number of PRS symbols = 1, S-PRS is mapped to all REs on the frequency axis and transmitted. Fig.10 In FIG. 1 , the case where the number of PRS symbols = 1 is shown, but the number of PRS symbols is not limited thereto. In other words, the Comb-1S-PRS pattern may be transmitted on one or more symbols.

[0198] In this disclosure, it is generally assumed that both Comb-N (N ≥ 1) and the number of symbols M (M ≥ 1) can be used. Figure 8 and Fig. 9 As shown, it is assumed that the comb pattern can be fully staggered or partially staggered across several symbols. Consideration of the staggered pattern can improve positioning accuracy because the reference signal is sent to all REs of the frequency across several symbols.

[0199] In addition, the positioning methods that the terminal can support can be defined as terminal capabilities. For example, methods such as SL arrival time difference (SL-TDOA), SL departure angle (SL-AOD), SL multi-round trip time (SL multi-RTT), SL round trip time (SL RTT), side link E-CID and side link arrival angle (SL-AOA) can be considered as positioning methods, and the positioning methods supported by the terminal are not limited thereto. The supportable SL positioning methods are determined by the terminal capabilities, and the corresponding capability information can be sent to other terminals and base stations.

[0200] When the terminal performs positioning through the SL, positioning-related configuration information may be (pre-)configured. For example, the S-PRS information may be (pre-)configured as positioning-related information. Specifically, the activation / deactivation of the S-PRS transmission may be (pre-)configured. When the S-PRS transmission is deactivated, the corresponding terminal may not perform S-PRS transmission even if the S-PRS transmission is instructed / requested by the location server (LS) or other terminals. In addition, when the transmission bandwidth (allocated area on the frequency axis) and period (allocated area on the time axis) of the S-PRS may be configured in various ways, the corresponding information may be (pre-)configured. As another example, if Figures 8 to 9 As described, the number of available comb patterns, the number of PRS symbols, and the position (starting symbol) of the transmitted PRS in the time slot can be (pre-)configured. As another example, the positioning-related information can be used to (pre-)configure information about the positioning method. For example, information about which positioning methods are available can be (pre-)configured. As positioning methods for terminals, there may be SL-TDOA, SL-AOD, SL multi-RTT, SL RTT, side link E-CID, SL-AOA, etc. The supported SL positioning methods are determined by the terminal capabilities, and the corresponding capability information can be sent to other terminals and base stations. In addition, the available positioning methods among the SL positioning methods that can be supported based on the terminal capabilities can be (pre-)configured.

[0201] As discussed with reference to Table 1, when the terminal does not receive the positioning configuration from another terminal or LS, the terminal may comply with the positioning configuration information that is pre-configured and then stored therein. For example, in this case, the terminal may not be located within the network coverage. As another example, it may be a case where no positioning-related configuration information is received from any other terminal. After a certain point in time, the terminal may be configured using the positioning configuration information from another terminal or LS. In the case of Table 1 where the corresponding UE (without LS) or LS (via UE) of the terminal is configured using the positioning information from another terminal, the positioning configuration information may have been sent via broadcast, unicast or multicast via SL, and may be indicated by SCI (first-level SCI or second-level SCI), or may be indicated by PC5-RRC or SL MAC-CE. In the case corresponding to the LS (via UE) in which the terminal is connected to the LS and the positioning information from the LS is used to configure the terminal, it may be information indicated from the superior of the terminal. On the other hand, in the case corresponding to Table 1 in which the LS of the terminal is configured using the positioning configuration information from the LS connected to the base station (through the BS), the terminal can be configured using the positioning configuration information from the base station in a cell-common manner. Here, cell common may indicate that the terminals in the cell receive the same information configuration from the base station. In this case, the terminal may consider a method for receiving SL-SIB from the base station and obtaining cell-common information. In addition, in the case corresponding to Table 1 in which the LS of the terminal is configured using the positioning information from the LS connected to the base station (through the BS), the terminal can be configured using the corresponding information in a UE-specific manner after establishing an RRC connection with the base station.

[0202] As described above, when the terminal does not receive the positioning configuration from another terminal or LS, the terminal can send or receive the positioning signal according to the positioning configuration information that is pre-configured and then stored therein. After a certain point in time, the terminal can be configured using the positioning information from another terminal or LS. In this case, one or more pieces of information may be configured. For example, the S-PRS information may be determined so that only one pattern is configured, and one or more pieces of pattern information may be allowed to be configured. When one or more pieces of pattern information are configured, the terminal may send corresponding configuration information to the base station and the LS. The LS may determine an appropriate S-PRS pattern and indicate the determined S-PRS pattern to the terminal. Conversely, the terminal may determine the pattern used in one or more pieces of S-PRS pattern information, and send the corresponding information to other terminals via broadcast, unicast, or multicast through the SL. In this case, the corresponding information may be indicated by an SCI (first level SCI or second level SCI), or may be indicated by a PC5-RRC or a SL MAC-CE. As another example, it may be determined that information about the positioning method is (pre) configured only in one method, and information about one or more positioning methods may be (pre) configured. The information about the positioning method may include information about whether the method is UE-based or UE-assisted. Alternatively, the information about the positioning method may include information about whether the method is absolute positioning, relative positioning or ranging. Alternatively, the information about the positioning method may include information about whether the method is SL-TDOA, SL-AOD, SL multi-RTT, SL E-CID or SL-AOA. When one or more pattern information is configured, the terminal may send corresponding configuration information to the base station or LS. The LS may determine an appropriate positioning method and indicate the determined positioning method to the terminal. Conversely, the terminal may determine the method used in the information about one or more positioning methods, and send the determined information to other terminals via broadcast, unicast or multicast through the SL. In this case, the corresponding information may be indicated by an SCI (first-level SCI or second-level SCI), or may be indicated by PC5-RRC or SL MAC-CE.

[0203] When the terminal performs positioning through SL, the terminal can send a positioning signal through SL. The positioning signal may include S-PRS. The method of sending the positioning signal in SL includes the transmission of the positioning signal from the PosRef terminal to the target terminal, and the transmission of the positioning signal from the target terminal to the PosRef terminal.

[0204] Depending on the positioning method used, both transmission methods may be performed, or only one of the two transmission methods may be performed. For example, when SL-TDOA is performed, SL positioning may be performed by transmitting S-PRS using the first method. On the other hand, when SL multi-RTT or SL RTT is performed, two S-PRS transmission methods may be required. Figure 7 In , UE-A and UE-B may correspond to the target terminal and the PosRef terminal respectively. Figure 7 , UE-A and UE-B are not limited to the target UE and PosRef UE, respectively. In other words, UE-A may correspond to the PosRef terminal, and UE-B may correspond to the target terminal. In addition, the S-PRS sent from the PosRef terminal to the target terminal and the S-PRS sent from the target terminal to the PosRef terminal may be the same type of positioning signals or different types of positioning signals.

[0205] In SL, the terminal can perform absolute positioning, relative positioning, or ranging. First, as mentioned above, absolute positioning (absolute position) can indicate the 2D coordinate position information (x, y) and 3D coordinate position information (x, y, z) of the terminal by longitude and latitude. In order for the target terminal to perform absolute positioning, multiple PosRef terminals may be required. In addition, the target terminal needs to receive known position information from multiple PosRef terminals for absolute positioning. For example, when the target terminal performs RTT with multiple PosRef terminals, Figure 7 There can be multiple pairs between the target terminal and a PosRef terminal in. This can be called multi-RTT. Next, relative positioning (relative position) can indicate relative 2D or 3D position information from other terminals. Therefore, in order for the target terminal to perform relative positioning, for example, Figure 7 As shown, only one PosRef terminal may be needed. It is necessary to receive known position information from the corresponding PosRef terminal. In addition, by additionally measuring or receiving direction information, the target terminal can find relative 2D or 3D position information from the PosRef terminal. Finally, ranging can indicate measuring the distance or direction to another terminal. In the case of measuring distance, for example, Figure 7 As shown, only one PosRef terminal may be needed. In addition, in the case of only measuring the distance or direction to other terminals, it is not necessary to receive known position information from the PosRef terminal. When the meaning of ranging in SL includes both distance information and direction information, ranging can have the same meaning as relative positioning.

[0206] <Fourth Embodiment>

[0207] In the fourth embodiment, Figure 8 , Fig. 9 and Fig.10 The S-PRS pattern shown in can be sent through the SL resource pool, such as Case 1 where the S-PRS is sent together in a resource pool (shared resource pool) used for SL communication, or Case 2 where the S-PRS is sent in a dedicated resource pool different from the resource pool used for SL communication.

[0208] In case 1, the S-PRS shares a pool in a resource pool for SL communication, that is, a pool in which PSCCH / PSSCH is transmitted. In a fourth embodiment, a method for transmitting S-PRS and a terminal operation are disclosed in consideration of case 1.

[0209] Since S-PRS transmission is allowed in the resource pool for SL communication in Case 1, S-PRS transmission should be considered in consideration of the existing physical layer structure (i.e., channels and signals included in the SL time slot). According to Case 1, PSCCH / PSSCH and S-PRS used for SL communication (data transmission) will be mixed in the corresponding pool. In Case 1, the following Case 1A, Case 2A, and Case 3A can be considered from the perspective of terminal transmission. In addition, the channels and signals included in the SL time slot may vary depending on which case is supported.

[0210] In case 1A, the terminal transmits only data in the shared resource pool (without transmitting S-PRS). In case 2A, the terminal transmits only S-PRS in the shared resource pool (without transmitting data). In case 3A, the terminal transmits both data and S-PRS in the shared resource pool.

[0211] Case 1A refers to existing SL communication.

[0212] Fig.11 An example of an existing physical layer structure according to an embodiment is shown. Fig.11 In part (a), an example of the SL physical layer structure is shown when the physical sidelink feedback channel (PSFCH) is not transmitted or in a time slot in which the PSFCH is not transmitted. In this case, the terminal can transmit the 1st SCI through the PSCCH, transmit the 2nd SCI in the PSSCH area, and transmit data in the PSSCH area. Fig.11 In part (b) of FIG. 1 , an example of a SL physical layer structure in a time slot in which a PSFCH is transmitted is shown. Fig.11 In part (a), the terminal may send the first SCI through the PSCCH, send the second SCI in the PSSCH region, and send data in the PSSCH region.

[0213] In case 2A, data is not transmitted, but PSCCH (1st SCI) and 2nd SCI for required control information may be transmitted while S-PRS is transmitted. In the case of 2nd SCI, it may be defined as a new 2nd SCI format including control information necessary for S-PRS transmission. In case 2A, it is necessary to solve where to transmit S-PRS in the SL slot (problem 1) and how to handle the PSSCH region when data is not transmitted (problem 2).

[0214] Question 2 above will be discussed in more detail in the sixth embodiment below.

[0215] Fig. 12A A method for mapping an S-PRS by avoiding a location where an existing signal is transmitted in a PSSCH region according to an embodiment is shown. Fig. 12B A method of mapping an S-PRS by avoiding a location where an existing signal is transmitted in a PSSCH region according to an embodiment is shown. Fig. 12C A method for mapping S-PRS by avoiding a location where an existing signal is transmitted in a PSSCH region according to an embodiment is shown. Specifically, Fig. 12A , Fig. 12B and Fig. 12C Involving how to deal with problem 1. Fig. 12A In the case of PSSCH, the last PSSCH DMRS occurs at the 5th, 7th or 8th DMRS. Fig. 12B In the case of PSSCH, the last PSSCH DMRS occurs at the 7th, 8th, 9th or 10th DMRS. Fig. 12C In the example, the last PSSCH DMRS occurs at the 9th, 10th or 11th DMRS.

[0216] exist Fig. 12A , Fig. 12B and Fig. 12C , a possible physical layer structure in which PSCCH / PSSCH for SL communication (data transmission) is transmitted is shown. The PSCCH duration can be configured as 2 symbols or 3 symbols. In addition, the symbol length (1 d ) can be configured from 6 to 13, the number of PSSCH DMRS symbols can be configured from 2 to 4, and the number of supported symbols can be configured according to the symbol length (l d ) to limit, such as Fig. 12A , Fig. 12B and Fig. 12CAs shown. Considering that the S-PRS is mapped to avoid the position where the existing signal is transmitted in the PSSCH area, the most ideal position standard may be the last PSSCH DMRS symbol. This is because the first PSSCH DMRS symbol has a symbol duration transmitted by FDM with the PSCCH, so if the S-PRS is transmitted in the corresponding part, the S-PRS may not be transmitted in all allocated frequency domains, and because the 2nd SCI may be mapped starting from the first PSSCH DMRS symbol. Fig. 12A , Fig. 12B and Fig. 12C In , there is space where the S-PRS can be sent from a minimum of 1 symbol to a maximum of 6 symbols before the last PSSCH DMRS symbol.

[0217] Fig.12D A method for transmitting S-PRS based on the position where the last PSSCH DMRS symbol is transmitted according to an embodiment is shown. Fig.12D In the example, with reference to a possible physical layer structure in which PSCCH / PSSCH for SL communication (data transmission) is transmitted, it is possible to Fig. 12A , Fig. 12B and Fig. 12C When the second SCI is mapped from the first PSSCH DMRS symbol to Fig.12D When the S-PRS symbols shown in parts (a), (b) and (c) of FIG. 1 are used, it is noted that the second SCI may not be mapped to the RE through which the PSSCH DMRS is transmitted and the RE through which the S-PRS is transmitted. In the method of using the PSSCH DMRS, as Fig.12D As shown in part (a) of , one or more PSSCH DMRS symbols are placed before the last PSSCH DMRS symbol. In this case, since the PSSCH DMRS is a Comb-2 pattern, when another PSSCH DMRS symbol is located before the last PSSCH DMRS symbol, a comb offset = 1 is applied to the pattern to perform an RE shift, as shown in FIG. Fig.12D As shown in part (a) of . Thus, positioning can be performed by a reference signal sent to all REs on two symbols. The S-PRS added before the last PSSCH DMRS symbol can be interpreted as a new reference signal. In addition, since the corresponding S-PRS is formed using the PSSCH DMRS, the S-PRS sequence can be generated according to equation (7) in the first embodiment. According to case 2A, when the terminal only sends the S-PRS in the shared resource pool without sending data, it may be necessary as shown in Fig.12DAn automatic gain control (AGC) symbol as shown in part (a) of . In addition, the AGC symbol can be generated by copying the reference signals of all REs transmitted in the last PSSCH DMRS symbol and adding the S-PRS symbol before the last PSSCH DMRS symbol. However, when the above question 2 and the corresponding method of this article are used, the AGC symbol may not be used.

[0218] In the method not using PSSCH DMRS, the method sends only one S-PRS symbol before the last PSSCH DMRS symbol. Fig.12D As shown in part (b) of FIG. 1 , an S-PRS with Comb=1 may be sent before the last PSSCH DMRS symbol. For the method for generating a sequence corresponding to the S-PRS, refer to the first embodiment and the second embodiment above. According to case 2A, when the terminal only sends the S-PRS in the shared resource pool but does not send data, it may be necessary to Fig. 12C The automatic gain control (AGC) symbol is shown in part (b) of FIG. Fig.12D As shown in part (b) of , the AGC symbol can be generated by copying the reference signals of all REs transmitted in the S-PRS symbol. However, when the above problem 2 is used and the method proposed in the sixth embodiment is used, the AGC symbol may not be used.

[0219] The third method is the "same" as the second method, but two or more S-PRS symbols are sent before the last PSSCH DMRS symbol. Fig.12D Part (c) of shows when two symbols of PRS (Comb-2) are transmitted, but is not limited thereto. In other words, the S-PRS pattern of two or more symbols given in the third embodiment may be transmitted before the last PSSCH DMRS symbol. For the method for generating the sequence corresponding to the S-PRS, refer to the first and second embodiments above. According to case 2, when the terminal transmits only the S-PRS in the shared resource pool without transmitting data, it may be necessary to Fig.12D The AGC symbol shown in part (c) of . The AGC symbol can be generated by copying the reference signals of all REs transmitted in the S-PRS symbol. However, when the above problem 2 is used and the corresponding method in the sixth embodiment is used, the AGC symbol may not be used.

[0220] In case 3A, PSCCH (1st SCI) and 2nd SCI for control information required when transmitting both data and S-PRS may be transmitted. In the case of the 2nd SCI, it may be defined as a new 2nd SCI format including control information necessary for S-PRS transmission and information necessary for data transmission. In case 3A, as in case 2A, it is necessary to determine where in the SL slot to transmit the S-PRS, and the method disclosed in case 2A may be applied.

[0221] According to case 1, when SL communication (data transmission) is performed and S-PRS is sent in a shared resource pool, it is necessary to indicate whether S-PRS is sent in the PSSCH area. This is because a terminal that sends S-PRS and a terminal that does not send S-PRS can coexist in a shared resource pool. A terminal that receives SL communication (data transmission) and S-PRS will be able to successfully decode and receive data and S-PRS through corresponding information. The corresponding information can be indicated by PSCCH (1st SCI) or 2nd SCI. The specific indication information may vary depending on how the above three cases are supported. Specifically, the above three cases can be supported by combination 1 that supports "case 1A + case 2A", combination 2 that supports "case 1A + case 3A", and combination 3 that supports "case 1A + case 2A + case 3A".

[0222] In the case of combination 1 or combination 2, only 1 bit of information may be used to indicate whether S-PRS is transmitted. However, in the case of combination 3, 2 bits of information may be used to indicate whether only S-PRS is transmitted, only data is transmitted, or both S-PRS and data are transmitted. In the present disclosure, when transmission is indicated by PSCCH (1st SCI), an example of how transmission may be specifically indicated by a reserved bit is given in Table 4 below. In the present disclosure, the method for indicating whether S-PRS is transmitted by PSCCH (1st SCI) is not limited to the method shown in Table 4 below.

[0223] [Table 4]

[0224]

[0225]

[0226] As shown above, Table 4 shows a method for indicating whether to transmit S-PRS using 1-bit information through PSCCH (1st SCI) by using a reserved bit. Referring to Table 4, the reserved bit can be used to indicate the "collision information receiver flag". According to Case 1, when SL communication (data transmission) and S-PRS transmission are performed in a shared resource pool, it is possible to (pre-)configure whether S-PRS transmission is allowed in the resource pool. The configuration of S-PRS can be interpreted as allowing S-PRS transmission. In this case, as shown in Table 4, 1 bit in the reserved bit can be used to indicate whether the terminal has transmitted S-PRS.

[0227] <Fifth Embodiment>

[0228] In the third embodiment, Figures 8 to 10 The S-PRS pattern shown can be sent through the SL resource pool. In addition, the SL resource pool in which the S-PRS is sent can be considered in the following cases:

[0229] Case 1, where the S-PRS is transmitted together in a resource pool (shared resource pool) used for SL communication, or Case 2, where the S-PRS is transmitted from a dedicated resource pool separate from the resource pool used for SL communication.

[0230] The fourth embodiment has disclosed the S-PRS transmission method and terminal operation for case 1. The fifth embodiment discloses a method for transmitting S-PRS and terminal operation in consideration of case 2.

[0231] In case 2, since the S-PRS is transmitted in a time domain and a frequency domain different from the resource pool used for SL communication, it is not necessary to determine the location of the S-PRS transmission in consideration of the existing physical layer structure (i.e., the channels and signals included in the SL time slot). In other words, the S-PRS transmission area included in the SL time slot and the additional necessary channels and signals can be newly designed. In addition, unlike case 1, in the dedicated resource pool for S-PRS transmission, the PSCCH / PSSCH for SL communication (data transmission) and S-PRS are not mixed, so no interference with the data signal occurs. Accordingly, compared to case 1, the positioning performance can be further improved. Therefore, in the fourth embodiment, in case 2, unlike case 1, only the case where the terminal transmits S-PRS only in the dedicated resource pool is considered in terms of terminal transmission. PSCCH (1st SCI) and 2nd SCI for control information required when transmitting S-PRS can be transmitted. In the case of the 2nd SCI, it can be defined as a new 2nd SCI format including control information necessary for S-PRS transmission. In case 2, it will be necessary to resolve the issue of where to send the S-PRS in the SL slot and how to send other necessary channels and signals.

[0232] Fig.13 A method for determining a position at which an S-PRS is transmitted in Case 2 of the fourth embodiment is shown. Fig.13 The PSCCH (first SCI) and S-PRS transmitted in the dedicated resource pool are shown in FIG. However, transmission of other channels and signals may be considered in addition. Fig.13 In the example above, the case of allocating dedicated AGC symbols is considered, but this can be omitted if PSCCH and S-PRS are transmitted using low modulation. Fig.13 Dedicated AGC symbols shown. Fig.13 The physical layer structure shown configures a dedicated resource pool through which the S-PRS is sent, and then configures the number / position of symbols in the time slot through which the S-PRS is sent and the number and position of subchannels. The SL bandwidth part (BWP) information can be used to (pre) configure the number / position of symbols in the time slot through which the S-PRS is sent. In addition, the number and position of subchannels through which the S-PRS is sent can be (pre) configured as resource pool information. The purpose of sending PSCCH is to indicate the resource allocation information through which the S-PRS is sent and for supporting other terminals to receive and sense through PSCCH. The resource pool information can also be used to (pre) configure the PSCCH duration (the number of PSCCH symbols) and the number of subchannels through which the PSCCH is sent. As described in the third embodiment, since the S-PRS is sent with various comb patterns, unlike the transmission of the PSSCH, for multiple users, the S-PRS can be sent while maintaining the same orthogonality in the time domain and frequency domain by applying an offset. In this embodiment, the case where the S-PRS is transmitted in the Comb-N pattern (N>1) and at least N terminals are orthogonally multiplexed is considered. In case 1, it can be assumed that the PSSCH is transmitted from the lowest PRB through which the PSCCH is transmitted. In addition, in case 1, it can be assumed that the S-PRS is transmitted from the lowest PRB through which the PSCCH is transmitted. It can be assumed that the comb offset of the S-PRS is 0. For reference, in the existing PSSCH transmission or S-PRS transmission according to case 1, when the number and position of subchannels are configured in the resource pool, the PSSCH and S-PRS may not be transmitted in all subchannel areas. In contrast, in case 2 where the number and position of subchannels are configured in the resource pool, it can be assumed that the S-PRS is transmitted to all subchannel areas. This is to improve positioning performance by transmitting the S-PRS in a wide frequency domain. However, instead of transmitting the S-PRS in all REs in the frequency domain, the transmitted resource element (RE) can be determined according to the comb offset. The comb offset value may be included in the PSCCH (1st SCI).

[0233] Fig.13An example of a method for determining a position at which an S-PRS is transmitted for case 2 is shown. Fig.13 Parts (a), (b), (d) and (e) of FIG. 1 show how an S-PRS of a Comb-2 pattern is transmitted. Fig.13 Part (c) of FIG. 1 shows how the S-PRS of the Comb-1 pattern is transmitted.

[0234] exist Fig.13 In parts (a) to (c) of FIG. 1 , when the S-PRS is transmitted in the Comb-N pattern, a case where multiplexing of at least N terminals is not considered, or a case where multiplexing is allowed but only one terminal transmits the S-PRS is shown. Specifically, according to Fig.13 In part (a), an AGC symbol is transmitted in the first symbol in the frequency domain before the PSCCH is transmitted. Therefore, it is shown that the first symbol of the PSCCH is duplicated and used as the AGC symbol. In the case of using this method, there is a region 1300 in which the PSCCH is not transmitted, so an AGC symbol may also be required before the symbol in which the S-PRS is transmitted. Fig.13 In part (b), the AGC symbol is transmitted in all regions of the first symbol, and in this case, the S-PRS symbol is duplicated and used as the AGC symbol. In the case of using this method, there is a region 1300 in which the PSCCH is not transmitted, but before the symbol in which the S-PRS is transmitted, the AGC symbol may also be unnecessary. Fig.13 The 6th symbol in part (b) is reserved for use with Fig.13 is compared to part (a) of the Fig.13 (c) of the present invention transmits an AGC symbol in all regions of the first symbol. Therefore, the first symbol of the PSCCH is duplicated and used as an AGC symbol, or the S-PRS symbol is duplicated and used as an AGC symbol. Fig.13 In part (c), the 6th and 7th symbols are reserved for use with Fig.13 part (a) of the comparison, and may not actually exist.

[0235] exist Fig.13 In parts (d) to (e) of FIG. 1 , a case where at least N terminals are multiplexed is considered when the S-PRS is transmitted in a Comb-N pattern. Fig.13 Part (d) to part (e) of FIG. 1 show the case where a Comb-2 pattern S-PRS is transmitted and two terminals are orthogonally multiplexed. Specifically, according to Fig.13In part (d), an AGC symbol is transmitted in the first symbol before each PSCCH is transmitted in the frequency domain, and in this case, the first symbol of the PSCCH is copied and used as the AGC symbol. In the case of using this method, it is possible as follows Fig.13 As shown in 1300 in part (a) of FIG. 1300 , a region 1300 in which the PSCCH is not transmitted occurs, and therefore, an AGC symbol may also be required before a symbol in which the S-PRS is transmitted. Fig.13 In part (e), the AGC symbol is transmitted in all regions of the first symbol, and in this case, the S-PRS symbol is duplicated and used as the AGC symbol. In the case of using this method, whether it is possible as Fig.13 Part (a) 1300 shows a region 1300 in which the PSCCH is not transmitted, and an AGC symbol may also be unnecessary before transmitting the S-PRS symbol. Fig.13 The 6th symbol in part (d) is reserved for Fig.13 comparison between part (a) and part (d), and may not actually exist.

[0236] <Sixth Embodiment>

[0237] In the fourth embodiment, case 1 of transmitting S-PRS together in a resource pool for SL communication and case 2 of transmitting S-PRS only in a shared resource pool are considered. The sixth embodiment discloses a method for problem 2 (how to process a PSSCH region when no data is transmitted).

[0238] Fig.14 A method for processing a PSCSCH region when no data is transmitted according to an embodiment is shown.

[0239] exist Fig.14 In part (a) of FIG. 1 , an example of transmitting data together in the PSSCH region when the second SCI is transmitted through the PSSCH is shown. Thus, when the second SCI is transmitted through the PSSCH, when data is transmitted together in the PSSCH region, the number of bits or symbols Q in which the second SCI is encoded using channel coding is S ′ CI2 It can be calculated as in the following equation 16. In the following equation (16), except for the first symbol in a slot for AGC, a symbol index l can be defined based on a symbol for transmitting PSCCH / PSSCH.

[0240]

[0241] In equation (16), O SCI2represents the number of bits of information included in the second SCI. The number of bits of information included may vary depending on the second SCI format used. In addition, in equation (16), L SCI2 The number of CRC bits used for the 2nd SCI, and 24 bits may be used; is a parameter for adjusting the number of coded bits of the 2nd SCI and can be determined using a bit field included in the 1st SCI; represents the modulation degree used for the second SCI transmission, wherein the corresponding value may be fixed to QPSK; R represents the coding rate used for the second SCI transmission, wherein the corresponding value may be determined using the bit field included in the first SCI, and the coding rate may be the same as the coding rate used for data transmission; is the number of resource elements (REs) used for the second SCI transmission at symbol index 1 and can be defined as in represents the number of REs in the bandwidth scheduled for PSSCH transmission at symbol index l, and represents the number of subcarriers used for transmission of PSCCH, PSCCHDMRS and S-PRS at symbol index l, that is, the number of REs; represents the number of symbols over which the PSSCH is transmitted and can be defined as It can be defined sl-lengthSymbols is the number of symbols used as SL, and one of the values ​​{7, 8, 9, 10, 11, 12, 13, 14} can be configured in the upper layer; and α is a value used as a parameter for determining the amount to which the 2nd SCI is mapped, and can be a value configured in the upper layer.

[0242] When confirmed , subtract 2 from sl-lengthSymbols to account for the first AGC symbol and the last gap symbol of the slot. In the slot where the PSFCH is transmitted, Determined as In the time slots where PSFCH is not transmitted, Determined as

[0243] When mapping the 2nd SCI, if there are remaining REs (i.e., REs to which the 2nd SCI will not be mapped) in the RB of the (OFDM or SC-FDMA) symbol to which the last symbol among the symbols generated (modulated) by encoding the 2nd SCI is mapped, the variable γ is determined so that the 2nd SCI is mapped to all remaining REs of the corresponding RB.

[0244] On the contrary, Fig.14 Compared with part (a), Fig.14 Part (b) of FIG. 1 shows an example of a case where data is not transmitted together in the PSSCH region when the second SCI is transmitted through the PSSCH. In the case where data is not transmitted in the PSSCH region and the second SCI is mapped to the PSSCH region according to equation (16), as shown in FIG. Fig.14 As shown in part (b), if the 2nd SCI is mapped only to a portion of the frequency domain of the PSSCH in the last symbol in which the 2nd SCI is transmitted, a power imbalance may occur between the corresponding symbol and the (multiple) previous symbols to which the 2nd SCI is mapped. In other words, in the (multiple) previous symbols to which the 2nd SCI is mapped, all the 2nd SCIs are transmitted in the frequency domain of the PSSCH, but in the last symbol to which the 2nd SCI is transmitted, only a portion of the frequency domain of the PSSCH is mapped, so that the power of the transmission signal between symbols may not be constant. When such a power imbalance occurs, difficulties may occur when sending and receiving signals. In addition, the automatic gain control (AGC) symbol is not safe, which may cause difficulties in the AGC. In order to solve this problem, the present disclosure proposes a method for operating the mapping of the 2nd SCI differently when data is transmitted together in the PSSCH region and when data is not transmitted together in the PSSCH region.

[0245] Specifically, Fig.14 Part (c) shows an example of transmitting the second SCI so that when control information is transmitted through the second SCI, the second SCI is mapped entirely to the remaining area of ​​the PSSCH without transmitting the control information together with the data. Note that the present disclosure is not limited to Fig.14 In the case of using this method, unlike equation (16) in which data is not transmitted together in the PSSCH region when the second SCI is transmitted through the PSSCH, the number of bits or symbols Q for encoding the second SCI using channel coding is S ′ CI2 It can be calculated as shown in the following equation (17).

[0246]

[0247] In equation (17), is the number of resource elements (REs) used for the second SCI transmission at the lth symbol of the slot and can be defined as in represents the number of REs in the bandwidth scheduled for PSSCH transmission at the lth symbol of the time slot, and represents the number of subcarriers used for transmission of PSCCH, PSCCH DMRS and S-PRS at the lth symbol of the time slot, that is, the number of REs; and represents the number of symbols over which the PSSCH is transmitted and can be defined as Can be defined sl-lengthSymbols is the number of symbols used as SL and can be configured with one of the values ​​{7, 8, 9, 10, 11, 12, 13, 14} in the upper layer.

[0248] When confirmed , subtract 2 from sl-lengthSymbols to account for the first AGC symbol and the last gap symbol of the slot. In the slot where the PSFCH is transmitted, Determined as In the time slots where PSFCH is not transmitted, Determined as

[0249] Note that equation (17) can be solved by configuring the large The above method can be interpreted as configuring the value of α to 1 and the value of γ to 0. value, configure the value of α to 1, and configure the value of γ to 0.

[0250] according to Fig.14 part (c), Fig.14 The power imbalance and AGC problems that may occur in part (b) of can be solved by sending the second SCI to be mapped to all the remaining regions of the PSSCH. Fig.14 In part (c), when mapping the 2nd SCI, a method of mapping and transmitting the 2nd SCI from the first symbol of the PSSCH region so that the 2nd SCI is sequentially mapped to all regions of the PSSCH may be considered. Different from this, as in the method for mapping the 2nd SCI, a method of mapping the 2nd SCI from a symbol starting with the first DMRS of the PSSCH region, mapping to the last symbol of the PSSCH, and then mapping from the first symbol of the PSSCH region to all regions of the PSSCH may be considered. In addition, note that according to equations (16) and (17) and Fig.14 In part (c), the 2nd SCI is not mapped to the RE through which the S-PRS is sent.

[0251] As reference Fig.14As described in part (c), the case where data is not sent but the 2nd SCI is sent in the time slot can be called "independent 2nd SCI", but note that the name can be different.

[0252] In the case of SL data transmission, the number of bits sent through PSSCH can be determined by the subchannel size in the frequency axis of the configured SL transmission, the number of subchannels, the number of symbols in the time axis, and the resource allocation result. Specifically, the subchannel information on the frequency axis of the SL can be (pre-)configured as resource pool information and can have such values, wherein the subchannel size can be (pre-)configured to a value in {10, 12, 15, 20, 25, 50, 75, 100} PRBs, the number of subchannels can be (pre-)configured to a value in {1, ..., 27}, or the starting position of the subchannel can be (pre-)configured to a value in {0, ..., 265}.

[0253] The symbol information on the time axis of SL can be (pre-)configured as SL BWP information and can have such values, where the symbol length can be (pre-)configured to a value among {7,8,9,10,11,12,13,14} PRBs, or the starting position of the symbol can be (pre-)configured to a value among {0,1,2,3,4,5,6,7}.

[0254] When allocating resources, the terminal selects a time slot with a configured SL symbol length. In this case, frequency resources can be allocated only to at least one subchannel or one or more consecutive subchannels with a configured subchannel size. In addition, in the case of SL data transmission, LDPC coding is used. Different from this, polarity coding is used to send the 2nd SCI, and since the amount of control information is limited compared to the case of SL data transmission, there may be a constraint on the number of bits (K) after rate matching. Specifically, CRC can be added to the information included in the 2nd SCI, polarity coding can be performed, and rate matching can be performed. However, since after rate matching, K has a value of K=4096, and only QPSK is used to modulate the 2nd SCI, assuming this, a constraint that control information can be allocated to a maximum of 2048 REs may occur.

[0255] Therefore, assuming the above-mentioned data transmission case, when resource allocation is performed for independent 2nd SCI transmission (i.e., the case where the 2nd SCI is not transmitted together with the SL data), a case may occur in which it is impossible to perform polar coding using the 2nd SCI with a limited K value. For example, assuming that the subchannel size is configured as 25 PRBs and the symbol length is configured as 14. Figure 6In the example shown, when considering AGC symbol 1, gap symbol 1, PSCCH transmission symbol 2, DMRS transmission symbol 2, etc., a situation may occur in which the number of required REs becomes about 2700 REs and exceeds 2048 REs. To solve this problem, the following alternatives may be considered, but are not limited to this

[0256] In alternative 1, the sub-channel size of the independent second SCI transmission may be (pre-)configured independently of the sub-channel size of the existing SL data transmission.

[0257] In alternative scheme 2, when the number of subchannels on the frequency axis, the number of subchannels, the number of symbols on the time axis, and the number of REs according to the resource allocation result are greater than 2048 in SL transmission through the traditional scheme, the number of REs is adjusted to not more than 2048 by adjusting the number of symbols transmitted by the independent second SCI.

[0258] In alternative scheme 3, when the number of subchannels on the frequency axis, the number of subchannels, the number of symbols on the time axis, and the number of REs according to the resource allocation result are greater than 2048 in SL transmission through the traditional scheme, the number of REs is adjusted to not more than 2048 by adjusting the number of REs on the frequency axis of the independent second SCI transmission.

[0259] In alternative 4, the number of bits (K) after rate matching of the polarity encoding used in the 2nd SCI transmission is increased.

[0260] Alternative 1 is to limit the subchannel size configured during the independent second SCI transmission and use a small number method of the subchannel size. In the present disclosure, the subchannel size that can be configured during the independent second SCI transmission is not limited to a specific value. For example, the following method can be considered.

[0261] In case of independent 2nd SCI transmission, the subchannel size may be (pre-)configured to one of {10, 12, 15} PRBs.

[0262] In this way, in the case of limiting the use of a small number of subchannel sizes, it is possible to prevent the number of allocated REs from exceeding 2048 REs due to a large subchannel size. It is obvious that, for this purpose, when allocating resources, the terminal needs to adjust the number of subchannels allocated as actual resources in the number of configured subchannels so that the number of allocated REs does not exceed 2048 REs.

[0263] In alternative solution 2, the number of symbols of the independent second SCI transmission is adjusted so that when the number of subchannels on the frequency axis, the number of subchannels, the number of symbols on the time axis, and the number of REs according to the resource allocation result are greater than 2048 in the SL transmission configured to the terminal through the conventional solution, the number of REs does not exceed 2048. Specifically, when the number of REs does not exceed 2048, as Fig.14 As shown in part (c), the independent 2nd SCI can be mapped and sent to all symbols of SL transmission. However, when the number of REs exceeds 2048, the independent 2nd SCI can be mapped and sent only in some symbols, so that the number of REs does not exceed 2048 in the symbols capable of SL transmission.

[0264] In alternative scheme 3, the number of REs on the frequency axis of the independent 2nd SCI transmission is adjusted so that when the number of subchannels on the frequency axis, the number of subchannels, the number of symbols on the time axis, and the number of REs according to the resource allocation result are greater than 2048 in the SL transmission configured to the terminal by the conventional scheme, the number of REs does not exceed 2048. Specifically, when the number of REs does not exceed 2048, the independent 2nd SCI may be mapped and transmitted to all subchannels used for resource allocation. However, when the number of REs exceeds 2048, the independent 2nd SCI may be mapped and transmitted only in some frequency REs so that, starting from the lowest subchannel index, the number of REs does not exceed 2048. For example, even when the number of allocated subchannels is 2, the independent 2nd SCI may be mapped and transmitted only to some frequency REs at the first subchannel index (e.g., starting from the lower RE on the frequency axis).

[0265] Alternative 4 is a method for increasing the number of bits (K) after rate matching of polar coding used in the 2nd SCI transmission. The problem existing in this embodiment can be solved when a large K value is introduced in consideration of the subchannel size on the frequency axis, the number of subchannels, and the number of symbols on the time axis in SL transmission. However, since the K value used in the polar coordinate coding of the existing Uu (DL or UL) is 8192, only up to K=8192 can be considered in SL to maintain the same constraints in the implementation.

[0266] <Seventh Embodiment>

[0267] The seventh embodiment discloses a method for configuring an S-PRS comb offset and an S-PRS muting pattern among parameters that can be configured for transmitting an S-PRS in a SL.

[0268] Fig.15 Comb offset and muting pattern during S-PRS transmission according to an embodiment are shown. Fig.15Part (a) shows an S-PRS comb offset, and shows an example of Comb-4 and transmitting S-PRS in one symbol. In the case of Comb-N, there may be N offset values, and the position of transmitting S-PRS may vary according to the offset value. Fig.15 Part (a) of , shows a case where it is Comb-4 and the S-PRS is sent to another resource element (RE) depending on which value of the offset value is 0, 1, 2, 3. In this embodiment, the following method is proposed as a method for determining the comb offset during S-PRS transmission. For details about the combSize below, refer to the third embodiment. However, in the present disclosure, the value of combSize is not limited to a specific value. In addition, in the present disclosure, the method for determining the S-PRS comb offset is not limited to the method disclosed below.

[0269] Method for determining S-PRS comb offset

[0270] When determining the S-PRS comb offset, in method 1, the S-PRS comb offset is determined by the CRC of the corresponding first SCI. The bit is determined by the LSB.

[0271] In method 2, the S-PRS comb offset is determined by the destination ID carried in the first SCI or the second SCI. The bit is determined by the LSB.

[0272] In method 3, the S-PRS comb offset is determined by the source ID carried in the first SCI or the second SCI. Position determined.

[0273] In method 4, the S-PRS comb offset is determined by a (pre-)configured value.

[0274] In method 5, the S-PRS comb offset is determined to be a fixed value (ie, zero).

[0275] In method 6, the S-PRS comb offset is determined by the Position determined.

[0276] In method 1, it is assumed that the PSCCH (i.e., the 1st SCI) is transmitted in the time slot in which the S-PRS is transmitted. However, if the PSCCH is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the most recently transmitted PSCCH (i.e., the 1st SCI). In method 1, it may be determined here, And the value p represents the parity bit p used to calculate the CRC of PSCCH 0、p 1 、p 2 、p 3 ,……,p L-1 , and can be generated by a cycle generator polynomial.

[0277] In method 2, it is assumed that the PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted, and the destination ID is included in the 1st SCI or the 2nd SCI. It is assumed that the destination ID is 16 bits. However, in the present disclosure, the destination ID is not limited to 16 bits. If the 1st SCI or the 2nd SCI is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the destination ID included in the most recently transmitted 1st SCI or the 2nd SCI.

[0278] In method 3, it is assumed that the PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted, and the source ID is included in the 1st SCI or the 2nd SCI. It is assumed that the source ID is 8 bits. However, in the present disclosure, the source ID is not limited to 8 bits. If the 1st SCI or the 2nd SCI is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the source ID included in the most recently transmitted 1st SCI or the 2nd SCI.

[0279] In methods 4 and 5, the PRS comb offset is (pre)configured or fixed to a specific value, so difficulties may arise when randomizing the offset value. In method 6, the PRS comb offset is indicated separately by the 1st SCI or the 2nd SCI, and the terminal can arbitrarily select and determine the corresponding value.

[0280] Fig.15 Part (b) and part (c) of show a muting pattern during S-PRS transmission and when a resource set for S-PRS transmission is configured and three resources (resource 0, resource 1, resource 2) for S-PRS transmission are configured in the resource set. A transmission period of a resource set for S-PRS transmission is configured, and resources in the set may be transmitted for each period. In addition, the S-PRS may be repeated within a transmission period. Reference Fig.15 Part (b) of FIG. 1 shows a case where the S-PRS is repeated within a transmission period. Specifically, a case where a repetition factor of 2 is configured is shown. In addition, a case where a gap of 4 is configured to indicate the position of the repetition is shown. However, as Fig.15 As shown in part (b) of FIG. 1 , if many terminals transmit S-PRS in SL, collision and interference may occur. In order to prevent collision and interference, a muting pattern may be introduced, and the S-PRS may not be transmitted at the original time of S-PRS transmission or through a muting pattern. Fig.15 Part (c) of the present invention shows a case where, when the muting pattern is configured as 1 during S-PRS transmission, the S-PRS is sent according to the existing S-PRS configuration, and when the muting pattern is configured as 0 during S-PRS transmission, the S-PRS is muted and not sent. In this embodiment, the following method is proposed as a method for determining a muting pattern during S-PRS transmission. In the following content, the value of mutingPatternLength is not limited to a specific value. In addition, the method for determining the S-PRS muting pattern in the present disclosure is not limited to the method proposed below. In addition, one or more of the following methods may be used in combination. In addition, one or more of the following methods may be supported, and (pre-) configuration of which method to use may be performed.

[0281] Method for determining S-PRS muting pattern

[0282] When determining the S-PRS muting pattern, in method 1, the S-PRS muting pattern is determined by the CRC of the corresponding first SCI. The bit is determined by the LSB.

[0283] In method 2, the S-PRS muting pattern is determined by the destination ID carried in the first SCI or the second SCI. The bit is determined by the LSB.

[0284] In method 3, the S-PRS muting pattern is a signal from the source ID carried in the first SCI or the second SCI. Position determined.

[0285] In method 4, the S-PRS muting pattern is determined by a (pre-)configured value.

[0286] In method 5, the S-PRS muting pattern is determined to be a fixed value (ie, zero).

[0287] In method 6, the S-PRS muting pattern is determined by the first SCI or the second SCI. Position determined.

[0288] In method 1, it is assumed that the PSCCH (i.e., the 1st SCI) is transmitted in the time slot in which the S-PRS is transmitted. However, if the PSCCH is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the most recently transmitted PSCCH (i.e., the 1st SCI). In method 1, it may be determined here, The value p represents the parity bit p used to calculate the CRC of the PSCCH 0 、p 1 、p2 、p 3 ,……,p L-1 , and can be generated by a cycle generator polynomial.

[0289] In method 2, it is assumed that the PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted. In addition, it is assumed that the destination ID is included in the 1st SCI or the 2nd SCI. It is assumed that the destination ID is 16 bits. However, in the present disclosure, the destination ID is not limited to 16 bits. If the 1st SCI or the 2nd SCI is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the destination ID included in the most recently transmitted 1st SCI or the 2nd SCI.

[0290] In method 3, it is assumed that the PSCCH (i.e., the 1st SCI and the 2nd SCI) is transmitted in the time slot in which the S-PRS is transmitted. It is assumed that the source ID is included in the 1st SCI or the 2nd SCI. It is assumed that the source ID is 8 bits. However, in the present disclosure, the source ID is not limited to 8 bits. If the 1st SCI or the 2nd SCI is not transmitted in every time slot in which the S-PRS is transmitted, it may be considered to perform an operation based on the source ID included in the most recently transmitted 1st SCI or the 2nd SCI.

[0291] In methods 4 and 5, the mute pattern is (pre)configured or fixed to a specific value, so difficulties may arise when randomizing the mute pattern. In method 6, the mute pattern is indicated solely by the 1st SCI or the 2nd SCI, and the terminal can arbitrarily select and determine the corresponding value.

[0292] Fig.16 2 shows the internal structure of a terminal according to an embodiment. Fig.16 As shown, the terminal may include a terminal receiver 1600, a terminal transmitter 1604, and a terminal processor 1602. The terminal receiver 1600 and the terminal transmitter 1604 may be collectively referred to as a transceiver. The transceiver may send a signal to a base station and receive a signal from the base station. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplification of the received signal and down-converting the frequency of the received signal. The transceiver may receive a signal through a radio channel, output the signal to the terminal processor 1602, and transmit the signal output from the terminal processor 1602 through the radio channel. The terminal processor 1602 may control a series of operations to allow the terminal to operate according to the above-described embodiments.

[0293] Fig.17 FIG. 2 shows the internal structure of a base station according to an embodiment. Fig.17As shown, the base station may include a base station receiver 1701, a base station transmitter 1705, and a base station processor 1703. The base station receiver 1701 and the base station transmitter 1705 may be collectively referred to as a transceiver. The transceiver may send a signal to a terminal and receive a signal from the terminal. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplification of the received signal and down-converting the frequency of the received signal. In addition, the transceiver may receive a signal through a radio channel, output the signal to the base station processor 1703, and transmit the signal output from the base station processor 1703 through the radio channel. The base station processor 1703 may control a series of operations to allow the base station to operate according to the above-described embodiments.

[0294] Each box and box combination in the flowchart can be implemented by computer program instructions. Because these computer program instructions can be loaded into a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, the instructions executed via the processor of the computer or other programmable data processing device generate means for implementing the functions specified in the (multiple) flowchart boxes. Because these computer program instructions can also be stored in a computer executable or computer readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, the instructions stored in the computer executable or computer readable memory can produce a product including an instruction means for executing the functions specified in the (multiple) flowchart boxes. Because computer program instructions can also be loaded onto a computer or other programmable data processing device, a series of operating steps can be performed on a computer or other programmable data processing device to generate a computer-implemented process, and therefore, the instructions executed on a computer or other programmable data processing device can provide steps for implementing the functions specified in the (multiple) flowchart boxes.

[0295] Each frame can also represent the module, code segment or code portion including one or more executable instructions for implementing (multiple) specified logical functions. It should also be noted that in some alternative implementations, the functions mentioned in the frame can occur out of order. For example, two frames shown in succession can actually be performed substantially simultaneously, or these frames can sometimes be performed in reverse order, depending on the functions involved.

[0296] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a first terminal in a wireless communication system supporting a side link SL, the method comprising: Identify whether an S-PRS sequence identifier ID for generating a SL positioning reference signal S-PRS is obtained from a higher layer of the first terminal; In a case where the S-PRS sequence ID is obtained from a higher layer of the first terminal, generating the S-PRS based on the obtained S-PRS sequence ID; Generating the S-PRS sequence ID based on 12 least significant bits (LSBs) of a cyclic redundancy check (CRC) for a physical sidelink control channel (PSCCH) associated with the S-PRS; generating the S-PRS based on the generated S-PRS sequence ID without obtaining the S-PRS sequence ID from a higher layer of the first terminal; and The generated S-PRS is sent to the second terminal.

2. The method according to claim 1, further comprising: Receive positioning configuration information from a location server via a positioning protocol, The higher layer of the first terminal determines the S-PRS sequence ID to be provided based on the positioning configuration information.

3. The method according to claim 1, further comprising: The positioning configuration information is sent to the second terminal via a positioning protocol.

4. The method according to claim 1, in, The S-PRS sequence ID is set in the range of 0 to 4095.

5. A method performed by a second terminal in a wireless communication system supporting a side link SL, the method comprising: Obtaining an SL positioning reference signal S-PRS sequence identifier ID for the first terminal, receiving an S-PRS from the first terminal; as well as Information associated with positioning of the second terminal is generated based on the S-PRS sequence ID and the S-PRS.

6. The method according to claim 5, in, The information associated with the positioning of the second terminal includes an absolute position value of the second terminal.

7. The method according to claim 5, further comprising: sending information associated with the location of the second terminal to a location server, The information associated with the positioning of the second terminal includes a measurement value used for the positioning of the second terminal.

8. The method according to claim 5, in, Obtaining the S-PRS sequence ID is performed upon receipt from a location server via a positioning protocol.

9. A first terminal in a wireless communication system supporting a side link SL, the first terminal comprising: Transceiver; as well as a processor operably coupled to the transceiver and configured to: identifying whether an S-PRS sequence identifier ID for generating a SL positioning reference signal S-PRS is obtained from a higher layer of the first terminal, In a case where the S-PRS sequence ID is obtained from a higher layer of the first terminal, generating the S-PRS based on the obtained S-PRS sequence ID, generating the S-PRS sequence ID based on 12 least significant bits (LSBs) of a cyclic redundancy check (CRC) for a physical sidelink control channel (PSCCH) associated with the S-PRS, generating the S-PRS based on the generated S-PRS sequence ID without obtaining the S-PRS sequence ID from a higher layer of the first terminal, and The generated S-PRS is sent to the second terminal.

10. The first terminal according to claim 9, in, The processor is further configured to: receiving positioning configuration information from a location server via a positioning protocol, and The higher layer of the first terminal determines the S-PRS sequence ID to be provided based on the positioning configuration information.

11. The first terminal according to claim 9, in, The processor is further configured to: Send positioning configuration information to the second terminal via a positioning protocol.

12. A second terminal in a wireless communication system supporting a side link SL, the second terminal comprising: Transceiver; as well as a processor operably coupled to the transceiver and configured to: Obtaining an SL positioning reference signal S-PRS sequence identifier ID for the first terminal, receiving an S-PRS from the first terminal, and Information associated with positioning of the second terminal is generated based on the S-PRS sequence ID and the S-PRS.

13. The second terminal according to claim 12, in, The information associated with the positioning of the second terminal includes an absolute position value of the second terminal.

14. The second terminal according to claim 12, in, The processor is further configured to: sending information associated with the location of the second terminal to a location server, The information associated with the positioning of the second terminal includes a measurement value used for the positioning of the second terminal.

15. The second terminal according to claim 12, in, Obtaining the S-PRS sequence ID is performed upon receipt from a location server via a positioning protocol.

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