METHOD AND APPARATUS FOR PERFORMING SIDELINK POSITIONING IN A WIRELESS COMMUNICATION SYSTEM - Patent application

Abstract

A method for performing sidelink positioning in a wireless communication system according to one aspect of the present disclosure may include obtaining sidelink resource pool configuration information, obtaining SL PRS configuration information, and transmitting SL PRSs based on SL PRS allocations.

Description

[Technical Field]

[0001] The present disclosure relates to a method and apparatus for performing sidelink positioning in a wireless communication system. [Background technology]

[0002] Device-to-device (D2D) communication refers to direct communication between one device and another. Direct communication refers to communication between a device and another device, either through network control or at the device's own discretion, without the involvement of other network devices. This type of device-to-device communication can be applied to vehicle communication, commonly known as vehicle-to-everything (V2X). V2X communication refers to a communication method in which vehicles communicate with road infrastructure and other vehicles while driving to exchange or share information such as traffic conditions. V2X-based services can include, for example, autonomous driving services, vehicle remote control services, interactive services such as games, and high-capacity short-range audio / video services such as AR and VR. Based on the performance requirements for supporting various V2X-based services through the 5G system, specific technologies required for the Long Term Evolution (LTE) and New Radio (NR) radio access technologies (RATs) within the 5G system are currently under discussion. Summary of the Invention [Problem to be solved by the invention]

[0003] The technical problem of the present disclosure relates to a method and apparatus for performing sidelink positioning in a wireless communication system.

[0004] Another technical problem of the present disclosure relates to a method and apparatus for allocating sidelink positioning reference signal (SL PRS) resources.

[0005] Another technical problem of the present disclosure relates to a method and apparatus for allocating SL PRSs based on a bitmap for time resources of a sidelink resource pool.

[0006] Another technical problem of the present disclosure relates to a method and apparatus for allocating SL PRS based on the periodicity of sidelink resources selected through sensing in a sidelink resource pool.

[0007] Another technical problem of the present disclosure relates to a method and apparatus for allocating SL PRS based on a synchronization signal block (SSB) period.

[0008] The technical problems to be solved by the present disclosure are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the following description. [Means for solving the problem]

[0009] A method for performing sidelink positioning in a wireless communication system according to one aspect of the present disclosure may include the steps of obtaining sidelink (SL) resource pool configuration information, obtaining sidelink positioning reference signal (SL PRS) configuration information, and transmitting a SL PRS based on a SL PRS allocation.

[0010] In addition, a method for performing sidelink positioning in a wireless communication system according to one embodiment of the present disclosure may include the steps of selecting a sidelink (SL) resource in a sidelink resource pool based on SL resource sensing, obtaining sidelink positioning reference signal (SL PRS) configuration information, and transmitting an SL PRS based on an SL PRS allocation.

[0011] Furthermore, a method for performing sidelink positioning in a wireless communication system according to one aspect of the present disclosure may include the steps of obtaining synchronization signal block (SSB) configuration information, obtaining sidelink positioning reference signal (SL PRS) configuration information, and transmitting an SL PRS based on an SL PRS allocation. [Effects of the Invention]

[0012] According to the present disclosure, there is provided a method for performing sidelink positioning in a wireless communication system.

[0013] According to the present disclosure, there is provided a method for allocating sidelink positioning reference signal (SL PRS) resources.

[0014] According to the present disclosure, a method for allocating SL PRSs based on a bitmap for time resources in a sidelink resource pool can be provided.

[0015] According to the present disclosure, it is possible to provide a method for allocating SL PRSs based on the periodicity of sidelink resources selected through sensing in a sidelink resource pool.

[0016] According to the present disclosure, a method for allocating SL PRS based on a synchronization signal block (SSB) period can be provided.

[0017] The effects obtained by the present disclosure are not limited to the effects described above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present disclosure pertains from the following description. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 illustrates an example V2X scenario to which the present disclosure may be applied. [Figure 2] FIG. 2 illustrates an example V2X scenario in which the present disclosure may be applied. [Figure 3] FIG. 3 illustrates an example V2X scenario to which the present disclosure may be applied. [Figure 4] FIG. 4 is a diagram illustrating an example of a service provided based on a sidelink to which the present disclosure can be applied. [Figure 5] FIG. 5 is a diagram for explaining an NR frame structure to which the present disclosure can be applied. [Figure 6] FIG. 6 is a diagram illustrating an NR resource structure to which the present disclosure can be applied. [Figure 7] FIG. 7 illustrates an example of a V2X resource pool configuration to which the present disclosure may be applied. [Figure 8] FIG. 8 illustrates an example of a V2X resource pool configuration to which the present disclosure may be applied. [Figure 9] FIG. 9 is a diagram illustrating a method for positioning based on Observed Time Difference Of Arrival (OTDOA) to which the present disclosure can be applied. [Figure 10] FIG. 10 is a diagram showing the configuration of the control plane and user plane for NRPP (NR positioning protocol) related to the present invention to which the present disclosure can be applied. [Figure 11] FIG. 11 is a diagram illustrating a method for performing localization based on SL SRS to which the present disclosure may be applied. [Figure 12] FIG. 12 illustrates a method for performing SL SRS-based positioning based on request information to which the present disclosure may be applied. [Figure 13] FIG. 13 is a diagram illustrating a method for performing localization based on SL SRS to which the present disclosure may be applied. [Figure 14]FIG. 14 illustrates a method for performing SL SRS-based positioning based on request information to which the present disclosure may be applied. [Figure 15] FIG. 15 is a diagram illustrating a method for performing localization based on SL SRS to which the present disclosure may be applied. [Figure 16] FIG. 16 illustrates a method for performing SL SRS-based positioning based on request information to which the present disclosure may be applied. [Figure 17] FIG. 17 is a diagram showing a kelp pattern applicable to the present disclosure. [Figure 18] FIG. 18 illustrates a method for performing cyclic prefixing based on DL PRS allocation patterns applicable to the present disclosure. [Figure 19] FIG. 19 illustrates a method for performing cyclic prefixing based on DL PRS allocation patterns applicable to the present disclosure. [Figure 20] FIG. 20 is a diagram illustrating a DL PRS resource allocation method applicable to the present disclosure. [Figure 21] FIG. 21 is a diagram showing an NR side link slot structure to which the present disclosure can be applied. [Figure 22] FIG. 22 is a diagram illustrating an NR sidelink resource pool configuration to which the present disclosure can be applied. [Figure 23] FIG. 23 is a flowchart illustrating a method for determining a SL PRS allocation period based on a sidelink slot set bitmap of a sidelink resource pool to which the present disclosure is applicable. [Figure 24] FIG. 24 is a diagram for explaining overall sensing-based resource selection and resource pool configuration to which the present disclosure is applicable. [Figure 25] 25 is a diagram showing a method in which repeated transmission is performed based on a Preserve period to which the present disclosure is applicable. [Figure 26] FIG. 26 is a flowchart illustrating a method for determining an SL PRS allocation period based on SL resources selected through SL resource sensing in a sidelink resource pool to which the present disclosure is applicable. [Figure 27] FIG. 27 is a flowchart illustrating a method for determining an SL PRS allocation period based on SSB to which the present disclosure is applicable. [Figure 28] FIG. 28 is a diagram showing a base station apparatus and a terminal apparatus to which the present disclosure can be applied. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present disclosure will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily implement the present disclosure. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein.

[0020] In describing embodiments of the present disclosure, if it is determined that a detailed description of a known configuration or function would obscure the gist of the present disclosure, the detailed description will be omitted. In addition, in the drawings, parts that are not related to the description of the present disclosure will be omitted, and similar parts will be designated by similar reference numerals.

[0021] In this disclosure, when a component is said to be "coupled," "coupled," or "connected" to another component, this refers not only to a direct connection, but also to an indirect connection where there is another component between them. Furthermore, when a component is said to "include" or "have" another component, this does not exclude the other component, but means that the component may further include the other component, unless otherwise specified.

[0022] In this disclosure, terms such as first and second are used only to distinguish one component from another, and do not limit the order or importance of the components unless otherwise specified. Therefore, within the scope of this disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment.

[0023] In this disclosure, components that are distinguished from one another are used to clearly describe the characteristics of each component and do not necessarily mean that the components are separate. That is, multiple components may be integrated into a single hardware or software unit, or a single component may be distributed into multiple hardware or software units. Therefore, even if not otherwise specified, such integrated or distributed embodiments are also included within the scope of this disclosure.

[0024] In this disclosure, the components described in various embodiments are not necessarily essential components, and some may be optional components. Therefore, an embodiment consisting of a subset of the components described in one embodiment is also included in the scope of this disclosure. Note that an embodiment including other components in addition to the components described in various embodiments is also included in the scope of this disclosure.

[0025] The present disclosure describes a wireless communication network, and operations performed in the wireless communication network may be performed in a process of controlling the network and transmitting or receiving signals by a system (e.g., a base station) that manages the wireless communication network, or in a process of transmitting or receiving signals by a terminal coupled to the wireless network.

[0026] It is apparent that various operations performed for communication with a terminal in a network consisting of multiple network nodes including a base station may be performed by the base station or other network nodes other than the base station. The term "base station (BS)" may be replaced with terms such as fixed station, Node B, eNodeB (eNB), ng-eNB, gNodeB (gNB), access point (AP), etc. Furthermore, the term "terminal" may be replaced with terms such as user equipment (UE), mobile station (MS), mobile subscriber station (MSS), subscriber station (SS), non-AP station (non-AP STA), etc.

[0027] In this disclosure, transmitting or receiving a channel includes transmitting or receiving information or signals through the channel. For example, transmitting a control channel means transmitting control information or signals through the control channel. Similarly, transmitting a data channel means transmitting data information or signals through the data channel.

[0028] Definitions of abbreviations used in this disclosure may be as follows:

[0029] D2D: Device to Device (communication) DCI: Downlink Control Information V2X: Vehicle to X (everything) V2V: Vehicle to Vehicle V2P: Vehicle to Pedestrian V2I / N: Vehicle to Infrastructure / Network SL: Sidelink SCI: Sidelink Control Information SFCI: Sidelink Feedback Control Information PSSCH: Physical Sidelink Shared Channel PSBCH: Physical Sidelink Broadcast Channel PSCCH: Physical Sidelink Control Channel PSDCH: Physical Sidelink Discovery Channel PSFICH: Physical Sidelink Feedback Indication Channel ProSe: (Device to Device) Proximity Services SLSS: Sidelink Synchronization Signal PSSID: Physical Sidelink Synchronization Identity n SA ID : Sidelink group destination identity N SL ID : Physical sidelink synchronization identity SA: Scheduling assignment TB: Transport Block TTI: Transmission Time Interval RB: Resource Block

[0030] In the following description, the term NR system is used to distinguish the system to which various examples of the present disclosure are applied from existing systems, but the scope of the present disclosure is not limited by these terms.

[0031] For example, the NR system supports various subcarrier spacings (SCS) taking into consideration various scenarios, service requirements, potential system compatibility, etc. In addition, the NR system can support transmission of physical signals / channels through multiple beams to overcome adverse channel environments such as high path loss, phase noise, and frequency offset that occur at high carrier frequencies. This allows the NR system to support applications such as enhanced Mobile Broadband (eMBB), massive Machine Type Communications (mMTC) / ultra Machine Type Communications (uMTC), and Ultra Reliable and Low Latency Communications (URLLC). However, although the term NR system is used in this disclosure as an example of a wireless communication system, the term NR system itself is not limited to these characteristics.

[0032] For example, 5G mobile communication technology can be defined. Here, 5G mobile communication technology can be defined to include not only the NR system but also the existing LTE-A (Long Term Evolution-Advanced) system. In other words, 5G communication can be a technology that operates not only in the newly defined NR system but also in consideration of backward compatibility with previous systems.

[0033] For example, the 5G sidelink field can include both the sidelink in the LTE system and the sidelink technology in the NR system. Here, the sidelink field can be essential for performance improvement through ultra-high reliability and ultra-low latency, and for incorporation into new and diverse services.

[0034] For convenience of explanation, the operation and related information for V2X will be described below based on an NR system, however, the features of the embodiments of the present disclosure are not limited to a specific system and may be similarly applied to other systems implemented in a similar manner, and are not limited to the exemplary system to which the embodiments of the present disclosure are applied.

[0035] Next, V2X can be considered vehicle-based communication. Here, the concept of a vehicle is changing from a simple means of transportation to a new platform. For example, IT technology is being incorporated into vehicles, and various V2X services are being provided based on this. For example, services such as traffic accident prevention, traffic environment improvement, autonomous driving, and remote driving are being provided. For this reason, there is an increasing need to develop and apply sidelink-related technologies for V2X.

[0036] More specifically, in relation to existing communication technologies, communication from a base station to a terminal may be called a downlink, and communication from a terminal to a base station may be called an uplink. Communication between terminals may be necessary, not just between a base station and a terminal, and communication from terminal to terminal may be called a sidelink. For example, in relation to V2X, communication between vehicles or communication between a vehicle and another object (an object other than a base station, such as a pedestrian terminal (P-UE) or a terminal-type roadside unit (RSU)) may be called a sidelink. That is, when performing vehicle-based communication, sidelink technology can be developed and applied, going beyond the limitations of communication between a terminal and a base station.

[0037] 1-3 are diagrams illustrating examples of V2X scenarios to which the present disclosure may be applied.

[0038] Figure 1 may be a scenario where communication is based on a sidelink, Figure 2 may be a scenario where V2X operation is performed using communication between a terminal (or vehicle) and a base station, and Figure 3 may be a scenario where V2X operation is performed using both sidelink and base station communication.

[0039] For example, in the description of V2X, the terminal may be a vehicle. In the description of V2X, the terminal and the vehicle are collectively referred to as the terminal. For example, the terminal may refer to a device capable of communicating with a sidelink and a base station, and may include a vehicle for V2X.

[0040] In relation to V2X, D2D (Device to Device) may refer to communication between terminals. ProSe may refer to proximity service for terminals performing D2D communication. SL (sidelink) may refer to sidelink, and SCI (Sidelink Control Information) may refer to control information related to sidelink. PSSCH (Physical Sidelink Shared Channel) may be a channel through which data is transmitted via sidelink, and PSCCH (Physical Sidelink Control Channel) may be a channel through which control information is transmitted via sidelink. PSBCH (Physical Sidelink Broadcast Channel) is a channel that transmits signals via sidelink in a broadcast manner and can transmit system information. PSFICH (Physical Sidelink Feedback Indication Channel) is a sidelink feedback channel that may be used to indicate feedback information. SLSS (Sidelink Synchronization Signal) may be a synchronization signal for sidelink, and PSSID (Physical Sidelink Synchronization Identity) may be ID information for sidelink synchronization. SA ID (Sidelink group destination identity) is ID information for distinguishing sidelink groups, and N SL ID(Physical sidelink synchronization identity) may be ID information for sidelink synchronization. V2V may refer to communication between vehicles, V2P may refer to communication between vehicles and pedestrians, and V2I / N may refer to communication between vehicles and infrastructure / networks.

[0041] SA, TB, TTI, and RB are terms used in the same way as in existing LTE. For example, in V2X communication, control information transmitted from one terminal to another terminal may be SA. When used in sidelink communication, this control information may be SCI. Here, SCI may be transmitted over PSCCH. Also, part of SCI may be transmitted over PSCCH and the other part may be transmitted over PSSCH.

[0042] In V2X communication, data transmitted from one terminal to another terminal can be set in TB units, where sidelink data can be transmitted via PSSCH.

[0043] Next, in this disclosure, operation modes may be defined by resource allocation schemes for control information and data transmission for V2X communication or direct link (e.g., D2D, ProSe, or SL) communication.

[0044] For example, the base station resource scheduling mode may be a resource allocation mode in which a base station (e.g., gNodeB, eNodeB) or a relay node schedules resources used by a terminal to transmit V2X (or direct link) control information and / or data. The terminal can transmit V2X (or direct link) control information and / or data on the designated resources.

[0045] For example, a base station or a relay node may provide sidelink (or direct link) control information and / or scheduling information for resources used for data transmission to a sidelink (or direct link) transmitting terminal through downlink control information (DCI). Thus, the sidelink (or direct link) transmitting terminal transmits sidelink (or direct link) control information and data to a sidelink (or direct link) receiving terminal, and the sidelink (or direct link) receiving terminal receives sidelink (or direct link) data based on the sidelink (or direct link) control information.

[0046] In addition, the UE autonomous resource selection mode may be a resource allocation mode in which the UE itself selects resources to be used by the UE to transmit control information and data. The UE's resource selection may be determined by sensing a resource pool (i.e., a set of resource candidates) or the like. The UE may transmit V2X (or direct link) control information and / or data on the selected resources.

[0047] As a specific example, a sidelink (or direct link) transmitting terminal transmits sidelink (or direct link) control information and data to a sidelink (or direct link) receiving terminal using resources selected by itself, and the sidelink (or direct link) receiving terminal receives sidelink (or direct link) data based on the sidelink (or direct link) control information.

[0048] The above-described base station resource scheduling mode may be referred to as Mode 1 in sidelink (or direct link) communication for D2D, etc. The base station resource scheduling mode may be referred to as Mode 3 in sidelink communication for V2X, etc. The above-described terminal autonomous resource selection mode may be referred to as Mode 2 in sidelink (or direct link) communication for D2D, etc. The terminal autonomous resource selection mode may be referred to as Mode 4 in sidelink communication for V2X, etc. However, this is merely an embodiment, and the scope of the present disclosure is not limited to the names of resource allocation modes. That is, among resource allocation modes to which the present disclosure is applicable, the same object and the same operation may be considered to be the same resource allocation mode even if their names are different.

[0049] For example, in NR V2X, the base station resource scheduling mode can be referred to as Mode 1 (Mode 1), and the terminal autonomous resource selection mode can be referred to as Mode 2 (Mode 2).

[0050] For convenience of explanation, the embodiments of the present disclosure will be described based on V2X communication, but the present disclosure is not limited thereto. For example, the present disclosure can be similarly applied to communication based on a direct link such as D2D or ProSe.

[0051] Furthermore, V2X can be a general term for V2V, V2P, and V2I / N. Here, V2V, V2P, and V2I / N can be defined as shown in Table 1, but are not limited thereto. That is, Table 1 below is merely an example and is not limiting.

[0052] [Table 1]

[0053] Additionally, V2X communication can include PC5-based communication, which is an interface for sidelink communication.

[0054] Table 2 and Figure 1 may be scenarios that support V2X operation based only on the PC5 interface (or SL). Here, Figure 1(a) may be V2V operation, (b) may be V2I operation, and (c) may be V2P operation. That is, Figure 1 may be a method of communication based on sidelink, and communication can be performed without a base station.

[0055] [Table 2]

[0056] Table 3 and Figure 2 may be scenarios that support V2X operation based only on the Uu interface (i.e., the interface between the UE and the base station). For example, Figure 2(a) may show V2V operation, (b) may show V2I ​​operation, and (c) may show V2P operation. That is, V2X operation can be supported using communication between the terminal and the base station.

[0057] [Table 3]

[0058] Table 4 and Figure 3 may be scenarios that support V2X operation using both the Uu interface and the PC5 interface (or SL), where Figure 3(a) may show scenario 3A of Table 4 and Figure 3(b) may show scenario 3B of Table 4.

[0059] Referring to FIG. 3(a), a terminal can transmit a V2X message to other terminals via a sidelink. Any terminal that receives the V2X message can transmit the V2X message to a base station via an uplink. The base station can receive the V2X message and transmit a message based on the received message to other nearby terminals via a downlink. For example, the downlink can be performed via a broadcast method.

[0060] Referring to Figure 3(b), a terminal transmits a V2X message to a base station through an uplink, and the base station can transmit the message to at least one terminal or RSU, etc. After that, the terminal or RSU that receives the message can transmit the message to multiple nearby terminals through a sidelink.

[0061] Both Figures 3(a) and 3(b) can support V2X operation using all communication and sidelinks between the base station and the terminal.

[0062] [Table 4]

[0063] As mentioned above, V2X communication can be performed via a base station or through direct communication between terminals. When performed via a base station, LTE-based V2X communication can transmit and receive data through a Uu link, which is a communication interface between an LTE base station and a terminal. When a sidelink is used for direct communication between terminals, LTE-based V2X communication can transmit and receive data through a PC5 link, which is a communication interface between LTE terminals.

[0064] For example, even in an NR system, V2X communication can be performed using communication between a terminal and a base station and a sidelink between terminals. Here, there may be differences between the communication method (uplink / downlink) between a base station and a terminal in an NR system and the communication method (uplink / downlink) between a base station and a terminal in an existing system. For example, some features may be similar, and there may be some changes based on the new NR system. Furthermore, there may also be differences in the sidelink between the existing system and the NR system. That is, taking into account the above-mentioned differences in communication between a base station and a terminal, there may also be some changes in the sidelink in the new NR system.

[0065] FIG. 4 is a diagram illustrating an example of a service provided based on a sidelink to which the present disclosure can be applied.

[0066] Referring to Figure 4, a V2X-related service or an IoT (Internet of Things) service can be provided based on a 5G sidelink. Here, the 5G sidelink may be a concept that includes both a sidelink based on the existing LTE system and a sidelink that takes into account the NR system. That is, a 5G sidelink service may include a service that is provided in consideration of one or more of the sidelinks applied to the LTE and NR systems.

[0067] For example, referring to FIG. 4, in relation to V2X services, platooning, automatic driving, advanced sensor, and remote driving services may be provided. Platooning may refer to a technology in which multiple vehicles dynamically form a group and operate in a similar manner. Autonomous driving may refer to a technology in which vehicles operate based on full automation or semi-automation. Advanced sensor may refer to a technology in which data acquired from sensors or video images is collected and exchanged. Remote driving may refer to a technology related to the technology and application for remote control of vehicles. That is, the above-mentioned services may be provided as V2X-based services. However, these services are merely examples, and the services to which the present disclosure is applicable are not limited to the specific services described above. Providing various V2X services may require requirements such as ultra-low latency, ultra-connectivity, low power consumption, and high reliability. Therefore, V2X services and operation methods for meeting these requirements may be required in the 5G sidelink. An example of the present disclosure will be described below taking these requirements into consideration.

[0068] The following describes the physical resource structure of an NR system.

[0069] FIG. 5 is a diagram for explaining an NR frame structure to which the present disclosure can be applied.

[0070] The basic unit of time domain in NR is T c =1 / (Δf max N f ) and Δf max =480 10 3 and N f = 4096, whereas the time domain base unit in LTE is Ts = 1 / (Δf ref N f,ref ) and Δf ref =15 10 3 and N f,ref= 2048. The constant for the multiplication relationship between the base unit of NR time and the base unit of LTE time is κ = T s / T c =64.

[0071] Referring to FIG. 5, the time structure of a frame for downlink / uplink (DL / UL) transmission is T f =(Δf max N f / 100)·T s = 10 ms, where one frame is T sf =(Δf max N f / 1000)·T s The number of consecutive OFDM symbols in each subframe is N subframe,u symb =N slot symb N subframe,u slot Also, each frame can be divided into two half frames of the same size, with half frame 1 consisting of subframes 0 to 4 and half frame 2 consisting of subframes 5 to 9.

[0072] Referring to Figure 5, N TA denotes the timing advance (TA) between the downlink (DL) and the uplink (UL), where the transmission timing of the uplink transmission frame i is determined based on the downlink reception timing at the terminal according to the following Equation 1:

[0073]

number

[0074] In Equation 1, N TA,offset is a TA offset value that occurs due to differences in duplex modes. Basically, in FDD (Frequency Division Duplex), TA、offsethas a value of 0, but in TDD (Time Division Duplex), N is set to N in consideration of the margin for DL-UL switching time. TA,offset can be defined as a fixed value of

[0075] FIG. 6 is a diagram illustrating an NR resource structure to which the present disclosure can be applied.

[0076] The resource elements (REs) in the resource grid can be indexed by each subcarrier spacing, where one resource grid can be generated for each antenna port and each subcarrier spacing, and uplink and downlink transmission and reception can be performed based on the resource grid.

[0077] In the frequency domain, one resource block (RB) consists of 12 REs, and an index (n PRB ) can be configured. The index for the RB can be used within a specific frequency band or system bandwidth. The index for the RB can be defined as in Equation 2 below. Here, N RB sc denotes the number of subcarriers per RB, and k denotes the subcarrier index.

[0078]

number

[0079] The NR system can be configured in various ways to meet the various services and requirements of the NR system. For example, unlike existing LTE / LTE-A systems, which only support one subcarrier spacing (SCS), the NR system can support multiple SCSs.

[0080] New pneumatic technologies for NR systems, including those supporting multiple SCSs, can operate in frequency ranges or carriers such as below 3 GHz, 3 GHz to 6 GHz, and 6 GHz to 52.6 GHz to solve the problem of not being able to use wide bandwidths in existing frequency ranges or carriers such as 700 MHz and 2 GHz, although the scope of this disclosure is not limited thereto.

[0081] Table 5 below shows examples of pneumoradio supported by the NR system.

[0082] [Table 5]

[0083] Referring to Table 5, the neural network can be defined based on the subcarrier spacing (SCS), cyclic prefix (CP) length, and number of OFDM symbols per slot used in the orthogonal frequency division multiplexing (OFDM) system. The above values ​​can be provided to the UE through upper layer parameters DL-BWP-mu and DL-BWP-cp for the downlink and through upper layer parameters UL-BWP-mu and UL-BWP-cp for the uplink.

[0084] For example, in Table 5, if the subcarrier spacing setting index (u) is 2, the subcarrier spacing (Δf) is 60 kHz, and normal CP and extended CP can be applied. In other cases, only normal CP can be applied.

[0085] A normal slot can be defined as a basic time unit used to transmit one piece of data and control information in an NR system. The length of a normal slot can be basically set to 14 OFDM symbols. Furthermore, unlike a slot, a subframe has an absolute time length corresponding to 1 ms in an NR system and can be used as a reference time for the length of other time intervals. Here, for coexistence or backward compatibility between LTE and NR systems, a time interval similar to an LTE subframe may be required in the NR standard.

[0086] For example, in LTE, data may be transmitted based on a transmission time interval (TTI), which is a unit of time, and the TTI may be set in units of one or more subframes. Here, in LTE, one subframe may be set to 1 ms and may include 14 OFDM symbols (or 12 OFDM symbols).

[0087] Furthermore, non-slots can be defined in NR. A non-slot may refer to a slot having a number of symbols at least one smaller than that of a normal slot. For example, when providing low latency, such as in a URLLC service, the latency can be reduced by using a non-slot having a number of symbols smaller than that of a normal slot. Here, the number of OFDM symbols included in a non-slot can be determined taking into account the frequency range. For example, in a frequency range of 6 GHz or higher, a non-slot having a length of one OFDM symbol can be considered. As a further example, the number of OFDM symbols defining a non-slot can include at least two OFDM symbols. Here, the range of the number of OFDM symbols included in a non-slot can be set as the length of a mini-slot up to a predetermined length (e.g., the normal slot length minus 1). However, as a non-slot standard, the number of OFDM symbols may be limited to, but not limited to, 2, 4, or 7 symbols.

[0088] For example, in unlicensed bands below 6 GHz, subcarrier spacing where u is 1 and 2 can be used, and in unlicensed bands above 6 GHz, subcarrier spacing where u is 3 and 4 can be used. For example, when u is 4, it can be used for SSB (Synchronization Signal Block).

[0089] [Table 6]

[0090] Table 6 shows the number of OFDM symbols per slot (N) for normal CP, depending on the subcarrier spacing setting (u). slot symb ), number of slots per frame (N frame,u slot ), the number of slots per subframe (N subframe,u slot ) Table 6 shows the above values ​​based on a normal slot having 14 OFDM symbols.

[0091] [Table 7]

[0092] Table 7 shows the number of slots per frame and the number of slots per subframe when extended CP is applied (i.e., when u is 2 and the subcarrier spacing is 60 kHz), based on a normal slot with 12 OFDM symbols per slot.

[0093] Furthermore, as mentioned above, one subframe may correspond to 1 ms on the time axis. Furthermore, one slot may correspond to 14 symbols on the time axis. For example, one slot may correspond to 7 symbols on the time axis. Therefore, the number of slots and symbols that can be considered within 10 ms, which corresponds to one radio frame, can be set differently. Table 8 shows the number of slots and the number of symbols according to each SCS. In Table 8, the 480 kHz SCS may not be considered, but is not limited to these examples.

[0094] [Table 8]

[0095] 7 and 8 show examples of V2X resource pool configuration to which the present disclosure can be applied.

[0096] With reference to Figures 7 and 8, a method for configuring a resource pool for a control channel (PSCCH) on which a scheduling assignment (SA) is transmitted in V2X and a data channel (PSSCH) on which data related thereto is transmitted will be described. Here, a resource pool may be a set of resource candidates available for transmission of SA and / or data. Each resource pool may be referred to as a slot pool in the time domain and a resource block pool in the frequency domain. Here, the resource pool illustrated in Figures 7 and 8 may be a resource pool for a vehicle (V)-UE in V2X. Furthermore, the resource pool configuration method illustrated in Figures 7 and 8 is merely an example, and resource pools may be configured in other manners.

[0097] The resource pools illustrated in FIGS. 7 and 8 can be defined in a terminal autonomous resource selection mode (or mode 2).

[0098] Meanwhile, in the base station resource scheduling mode (or Mode 1), resources corresponding to all sidelink slots in the time domain (e.g., corresponding to all uplink slots in NR) and all resource blocks RB in a V2X carrier or band in the frequency domain may be a set of resource candidates usable for SA and / or data transmission. Furthermore, in the base station resource scheduling mode (or Mode 1), a resource pool may be separately defined, as in the terminal autonomous resource selection mode (or Mode 2), to set a set of resource candidates usable for the SA and / or data transmission.

[0099] That is, the resource pool according to the present disclosure described with reference to FIGS. 7 and 8 can be defined in the terminal autonomous resource selection mode (or mode 2) and / or the base station resource scheduling mode (or mode 1).

[0100] The slot pool, which corresponds to a resource pool in the time domain, will be specifically described below.

[0101] Regarding the resource pool, slots in which the resource pool is set in the time domain are shown in Figure 7. As shown in Figure 7, slots for the V2X resource pool may be defined by indicating them as a bitmap that is repeated for all slots except for specific slots. The slots for the V2X resource pool may be slots in which SA and / or data transmission and / or reception is allowed for the resource pool in V2X.

[0102] Here, the slots excluded from the bitmap repetition application may include slots used for transmitting sidelink signal blocks (SSBs) including a primary sidelink synchronization signal (PSSS), a secondary sidelink synchronization signal (SSSS), and a physical sidelink broadcast channel (PSBCH). Furthermore, the excluded slots may further include downlink (DL) slots and flexible slots that are not uplink (UL) slots and can be used as sidelink (SL) slots in TDD. Here, the excluded slots are not limited to the above examples.

[0103] For example, the excluded slots within a SFN (System Frame Number) or DFN (D2D Frame Number) period may include d non-uplink slots and a slot for SSB. Furthermore, the excluded slots may be of length L within the SFN or DFN period. bitmap Since the bitmap is repeatedly applied in integer multiples, it may further include d' slots to be excluded. Here, the excluded slots are not limited to the above examples.

[0104] In addition, the repeatedly applied bitmap can be indicated by higher layer signaling such as RRC (the "slot indication of resource pool" signaling field shown in FIG. 7). When the bitmap value is 1, it indicates a slot for a resource pool, and when it is 0, it indicates a slot not belonging to the resource pool. Here, the u value in FIG. 7 is a value according to SCS (Subcarrier Spacing) and can follow the values ​​defined in Tables 5 to 7.

[0105] Next, a resource block pool corresponding to a resource pool in the frequency domain will be specifically described.

[0106] Regarding the resource pool, slots in which the resource pool is set in the frequency domain are shown in Figure 8. As shown in Figure 8, in the resource pool, the PSCCH for transmitting SA and the PSSCH for transmitting data can be simultaneously transmitted within one sub-channel, and the PSSCH can be transmitted over the entire sub-channel. In contrast, the PSCCH can be transmitted over a portion of the sub-channel.

[0107] As shown in FIG. 8, in a slot where a resource pool is configured in the time domain for V2X, all RBs (RB#0 to RB#N) in the frequency domain are allocated to the V2X resource pool. UL RB -1)) can be defined in units of one RB (where N UL RB is the total number of RBs corresponding to the system bandwidth for uplink (UL). Since V2X for sidelink is defined in the UL band, UL is replaced with SL (i.e., N UL RB Instead of N SL RB The 'Starting RB of sub-channels' signaling field can be indicated by higher layer signaling such as RRC. Contiguous RBs corresponding to a total of K sub-channels from the RB indicated by the 'Starting RB of sub-channels' belong to the resource pool. Here, the number of RBs constituting one sub-channel can be indicated by a 'Sub-channel size' signaling field, and the number of the K sub-channels can be indicated by a 'Number of sub-channels' signaling field through higher layer signaling such as RRC.

[0108] For example, "Sub-channel size" N subchannel The number of RBs may be 10, 15, 20, 25, 50, 75, or 100, but is not limited to this, and 4, 5, or 6 RBs may also be used. Note that, as shown in FIG. 8, the PSCCH for SA allocated to a portion of a subchannel may be allocated to X RBs in the subchannel, where X≦N subchannel is.

[0109] The positioning technology applied below is based on LTE (Long Term Evolution) and is being further improved using NR (New Radio) wireless technology. For commercial use, it includes technology that satisfies a maximum error of 3 m indoors and 10 m outdoors for 80% of users within coverage. For this purpose, various technologies are being considered for the downlink and / or uplink, such as time-of-arrival (TA)-based technology and angle-of-departure / arrival (AR)-based technology.

[0110] Downlink-based methods include a time-based technique called DL-TDOA (Time Difference of Arrival) and an angle-based technique called DL-AoD (Angle of Departure). For example, when estimating the location of a terminal based on DL-TDOA, the arrival time difference of signals transmitted from different transmission points is calculated, and the location of the terminal may be estimated based on the arrival time difference value and the location information of each transmission point. For example, when estimating the location of a terminal based on DL-AoD, the location of the terminal may be estimated by checking the angle of departure of a signal transmitted to the terminal and determining the direction in which the signal is transmitted based on the location of the transmission point.

[0111] In addition, uplink-based methods include a time-based technique called UL-TDOA (Time Difference of Arrival) and an angle-based technique called DL-AoA (Angle of Arrival). For example, when estimating the location of a terminal based on UL-TDOA, the time difference between the arrival times of signals transmitted from the terminal at each transmission point is calculated, and the location of the terminal may be estimated based on the arrival time difference value and the location information of each transmission point. For example, when estimating the location of a terminal based on DL-AoA, the location of the terminal may be estimated by checking the angle of arrival of a signal transmitted from the terminal and determining the direction in which the signal is transmitted based on the location of the transmission point.

[0112] Further, downlink and uplink-based methods include a multi-cell Round-Trip Time (RTT) method, an RTT method between one or more neighboring gNodeBs and / or Transmission Reception Points (TRPs) for NR downlink and uplink positioning, and an Enhanced Cell ID (E-CID) method. For example, when estimating the location of a terminal using multi-cell RTT, the time between a signal being transmitted in multiple cells and a response being received (i.e., RTT) is measured, and the terminal's location may be estimated based on location information of multiple cells. Furthermore, the terminal's location may be estimated by checking the RTT signal from the gNodeB and / or TRP. In addition, when estimating the location of a terminal based on E-CID, the terminal's location may be estimated based on cell location information after measuring the angle of arrival and reception strength to confirm each cell ID.

[0113] To realize the above technology, the LTE downlink-based PRS (Positioning Reference Signal) is being newly discussed as "DL PRS" modified according to the NR downlink structure. Additionally, for the uplink, the SRS (Sounding Reference Signal), an NR-based uplink reference signal that takes MIMO into account, is being developed into "SRS for positioning," an improved reference signal that takes positioning into account.

[0114] Furthermore, in order to provide an improved solution related to positioning operations, the requirements for high accuracy for horizontal and vertical position measurements, low latency, network efficiency (e.g., scalability, RS overhead, etc.) and terminal efficiency (e.g., power consumption, complexity, etc.) are additionally taken into consideration.

[0115] For example, the positioning operation may require high accuracy in consideration of IIoT scenarios, and for this purpose, downlink / uplink (DL / UL) position reference signals, signaling / procedures for improved accuracy, reduced latency, and methods for improving network efficiency and terminal efficiency may be considered.

[0116] As a result, work is being applied to improve the performance of NR-based positioning technologies for higher accuracy, lower latency, and network / device efficiency in commercial use cases such as IoT devices for smart homes and wearables, and in Industrial IoT (Inter of Things) use cases such as IoT devices in smart factories.

[0117] In relation to this, the aim is to improve accuracy to within a maximum error of 1 m for commercial use cases and within a maximum error of 0.2 m for IIoT use cases, and to further shorten the delay time from the current 100 ms to within 10 ms.

[0118] Here, an IIoT scenario considering indoor smart factory devices may be as shown in Table 9 below. As an example, Table 10 below shows settings for a simulation considering an IIoT scenario. Specifically, in Table 10, hall size, base station locations, and room height are set considering an IIoT scenario such as a smart factory, and the transmission and reception operations of the base station can be confirmed based on these settings. However, this is merely an example and is not limited to the above settings.

[0119] Specifically, the IIoT scenario can consider cases where clutter is dense and cases where clutter is sparse in the internal environment. In other words, it can be distinguished based on how many clusters exist in the internal environment. In addition, the IIoT scenario can consider cases where the antenna height is higher or lower than the average height of the cluster. In other words, the IIoT scenario can be as shown in Table 9 below, taking into account the above cases.

[0120] That is, InF-SL is a scenario that takes into account the case where clusters are not densely packed in an indoor factory environment such as a smart factory, and both the transmitting and receiving antennas of the base station are lower than the average antenna height of the cluster.InF-DL is a scenario that takes into account the case where clusters are densely packed in an indoor factory environment such as a smart factory, and both the transmitting and receiving antennas of the base station are lower than the average antenna height of the cluster.

[0121] Meanwhile, InF-SH is a scenario that takes into account the case where clusters are not densely packed in an indoor factory environment such as a smart factory, and the base station's transmitting or receiving antenna is higher than the average antenna height of the cluster.InF-DH is a scenario that takes into account the case where clusters are densely packed in an indoor factory environment such as a smart factory, and the base station's transmitting and receiving antenna is higher than the average antenna height of the cluster.

[0122] Additionally, InF-HH is a scenario that takes into account the case where both the transmitting and receiving antennas of the base station are higher than the average antenna height of the cluster, regardless of whether the cluster is densely packed in an indoor factory environment such as a smart factory.

[0123] Here, a cluster refers to a configuration in which base stations are densely arranged at regular intervals in a certain space. For example, a cluster can be realized with 18 base stations in an internal environment as shown in Table 10, but this is only an example and is not limited to this.

[0124] As mentioned above, the reason why factors such as cluster density and antenna height between base stations and clusters were taken into consideration in the scenario is that these factors may change the characteristics and interference of radio waves, which may lead to gradual changes in positioning technology to meet the various performance requirements for positioning (accuracy, delay time, network / terminal efficiency, etc.).

[0125] However, in actual applications, a common positioning technology that can cover all the requirements in the five scenarios can be applied, and the positioning technology mentioned in the present invention below can also be applied to all the five scenarios. That is, it is possible to position all IIoT devices that operate based on NR in an indoor factory environment such as a smart factory by applying the positioning technology described later in this disclosure.

[0126] [Table 9]

[0127] [Table 10]

[0128] The following describes a method for generating a PRS taking into account the positioning requirements in light of the aforementioned IIoT scenarios and new applications.

[0129] FIG. 9 is a diagram illustrating a method for positioning based on Observed Time Difference Of Arrival (OTDOA) to which the present disclosure can be applied.

[0130] OTDOA is a method for measuring location by tracking signals transmitted to a ground station via a communication satellite in LTE and / or NR systems. That is, OTDOA is based on measuring the arrival time difference of radio signals transmitted at various locations. For example, multiple cells may transmit a reference signal (RS), which the terminal may receive. Because the distance between each of the multiple cells and the terminal's location varies, the arrival time at which the RS transmitted from each of the multiple cells is received by the terminal may also differ. In this case, the terminal may calculate the time difference for the signal received from each cell and transmit the calculated information to the network. The network may combine the time difference with antenna position information for each cell to calculate the terminal's location. In this case, at least three cells may be used to measure the terminal's location.

[0131] As an example, the difference in time at which a terminal receives a reference signal from each of a pair of base stations (gNodeBs / eNodeBs) is defined as the Reference Signal Time Difference (RSTD). Here, location measurement using RSTD can be performed based on downlink signals. A terminal can estimate its location based on the Time Difference Of Arrival (TDOA) measurement of a special reference signal received from another base station (gNodeBs / eNodeBs).

[0132] FIG. 10 illustrates the configuration of the control plane and user plane for the NR positioning protocol (NRPP) related to the present disclosure to which the present disclosure can be applied. As an example, the positioning technology may be defined as at least one of Enhanced Cell ID (E-CID), Observed Time Difference of Arrival (OTDOA), and Global Navigation Satellite System (A-GNSS). The positioning technology may simultaneously support control plane and user plane positioning solutions. LTE and / or NR network-based positioning functions may be primarily controlled by a Location Management Function (LMF). Control plane positioning and user plane positioning may be performed through the LMF. The LMF is controlled at the network end and may interface with a base station through a mobility entity (e.g., Access and Mobility Management Function (AMF)). As an example, the LMF may correspond to a location server, which will be described later in this disclosure.

[0133] As another example, LTE and / or NR network-based positioning functions may be primarily controlled by an Evolved-Serving Mobile Location Centre (E-SMLC) / Secure User Plane Location (SLP) Location Platform (SUPL) based on the LTE positioning protocol (LPP). Here, positioning may be performed in the control plane through the E-SMLC and in the user plane through the SLP, each of which may be controlled at the network end and linked through a base station and a mobility entity (e.g., a Mobility Management Entity (MME)).

[0134] For example, in an LTE system, positioning is performed through downlink-based positioning estimation based on a time difference, or through cell ID-based positioning. In an NR system, positioning can be performed taking into account downlink-based positioning estimation (e.g., PRS) and uplink-based positioning estimation (e.g., SRS for positioning). Furthermore, the positioning can be performed based on the signal exchange time for multiple cells in round trip time (RTT), or based on cell ID. Furthermore, the positioning can be performed based on the signal reception time difference. Since new communication systems perform communication based on beams, positioning can be performed based on the angle difference between each beam. Based on the above, the downlink / uplink reference signals and the operations of a terminal / base station can be as shown in Tables 11 and 12 below.

[0135] [Table 11]

[0136] [Table 12]

[0137] Here, the terms in Table 11 and Table 12 may be as follows:

[0138] RSTD (Reference Signal Time Difference) RSRP (Reference Signal Received Power) RTOA (Relative Time Of Arrival) RSRQ (Reference Signal Received Quality) RSRPB (Reference Signal Received Power per Branch) RRM (Radio Resource Management) CSI-RS (Channel State Information Reference Signal)

[0139] Here, RSTD may be the transmission time difference of the reference signal, and RTOA may be the relative time value at which the signal arrives. Positioning can be performed based on the location information of the transmission point by calculating the relative time difference based on the location of the transmission point that transmitted the reference signal and the transmission time difference. Also, RSRP is the strength of the received reference signal, and RSRPB is the strength of the reference signal measured at each branch. RSRQ is the quality of the received reference signal. It is possible to check whether positioning is possible by checking the strength and quality of the received reference signal through RSRP and RSRQ. In addition, RRM can perform resource management and check resources for positioning.

[0140] As an example, the uplink reference signal for positioning may be set as an SRS for positioning. However, this is merely a name for convenience of explanation and is not limited to the above-described embodiment. In addition, it may be applied to a newly proposed communication system by changing the name, and may be applied in a form changed according to the new communication system.

[0141] As a specific example, an SRS for positioning operations can be generated in an NR system. Here, the number of SRS symbols can be 1, 2, or 4 for "SRS for MIMO (Multi Input Multi Output)." Since more SRS symbols may be required for positioning, the number of SRS symbols can be 1, 2, 4, 8, or 12. The SRS symbol position can be up to the Nth symbol (N=0, 1, . . . , 13) from the end of the slot. That is, the SRS symbols can be allocated based on the end of the slot. For example, the number of SRS symbols can be 2, 4, or 8, as will be described later. Furthermore, for example, an offset can be applied to the SRS mapping, as shown in Table 13 below.

[0142] [Table 13]

[0143] The SRS sequence may be a Zadoff-Chu based sequence. For example, the SRS sequence may be generated based on the following Equation 3: where n is a subcarrier index and l′ is a symbol. JPEG2025531775000017.jpg1041, JPEG2025531775000018.jpg1062. pi may be an antenna port. As an example, since the SRS for positioning uses only one antenna port, the pi value may be 1. i is the Cyclic Shift (CS) value, and α i can be expressed as the following Equations 4 and 5, and an SRS sequence can be generated based on this. JPEG2025531775000019.jpg1050. Here, the SRS sequence can maintain orthogonality by shifting the phase according to Equations 4 and 5 below.

[0144]

number

[0145]

number

[0146]

number

[0147] According to the present invention, the number of SRSs can be set to various values ​​such as 2, 4, or 8. For example, in the case of an LTE system, the number of SRSs can be set to 4, and 12 CSs can be used based on this. The number of SRSs according to the present invention can be set by applying different numbers depending on the system to be used.

[0148] Considering the SRS for positioning in the new communication system according to the present invention, if the kelp size is 2, the maximum number of CSs can be 8. Also, if the kelp size is 4, the maximum number of CSs can be 12. Also, since the SRS can be used for positioning, a kelp size of 8 can be considered.

[0149] For example, the SRS for positioning may support only one antenna port. The SRS for positioning does not support frequency hopping, and frequency axis allocation may support 4 PRB to 272 PRB in 4 PRB increments. Furthermore, in the case of the SRS for positioning, aperiodic SRS can be supported in the same way as the aperiodic SRS. Information regarding the antenna port, frequency hopping, frequency allocation, and periodicity can be indicated through upper end signaling.

[0150] For SRS for positioning, requirements must be met taking into account IIoT scenarios and use cases, which may require methods to increase orthogonality or reduce overhead.

[0151] For this purpose, the number of symbols of the SRS for positioning can be 1, 2, 4, 8, or 12. Furthermore, the comb size for positioning can be 2, 4, or 8. Here, the SRS can be a sequence based on phase prefixing with a Zadov-Chu sequence. In this case, CS can be a value for phase prefixing, and each phase-prefixed value can maintain orthogonality based on the CS value.

[0152] For example, the UE may configure parameters for the SRS for positioning based on higher layer signaling. Specifically, the UE may configure the SRS through an SRS resource set for positioning (e.g., "SRS-PosResourceSet-r16") as an upper layer parameter. Here, the SRS resource set for positioning parameter may include an SRS resource set ID parameter for positioning (e.g., srs-PosResourceSetId-r16). In this case, the SRS resource set ID parameter (e.g., srs-PosResourceSetId-r16) may include a resource set ID. Furthermore, the SRS resource set for positioning parameter may include an SRS resource list for positioning parameter (e.g., srs-PosResourceIdList-r16). In this case, the SRS resource list parameter for positioning may include a list of resource IDs in the SRS resource set. Furthermore, the SRS resource set for positioning parameter may include a resource type parameter (e.g., resourceType-r16). In this case, the SRS resource set parameters for positioning may include information on whether the resources are aperiodic, semi-persistent, or periodic. The SRS resource set parameters for positioning may also include pathloss-related parameters for positioning (e.g., pathlossReferenceRS-Pos-r16). Here, the pathloss-related parameters for positioning may include information on a reference signal to be referenced in relation to pathloss. For example, the reference signal to be referenced may be at least one of an SSB of a serving cell, an SSB of a neighbor cell, and a DL PRS, and the information may be included in the pathloss-related parameters for positioning.

[0153] In addition, the UE may configure SRS resources based on SRS resource parameters for positioning (e.g., SRS-PosResource-r16) in the higher layer parameters. Here, the SRS resource parameters for positioning may include an SRS resource ID parameter for positioning (e.g., srs-PosResourceId-r16). In this case, the SRS resource ID parameter for positioning may include an SRS resource set. In addition, the SRS resource parameters for positioning may include a transmission comb parameter (e.g., transmissionComb-r16). In this case, the transmission comb parameter may include information related to the comb to be transmitted. For example, the comb size may be 2, 4, or 8. As a specific example, the transmission comb parameter may indicate a comb offset (combOffset) and a cyclic prefix (combOffset) value when the comb size is 2. As another example, the transmission comb parameter may indicate a comb offset (combOffset) and a cyclic prefix (combOffset) value when the comb size is 4. Further, as an example, the transmit comb parameters may indicate combOffset and cyclic prefix values ​​when the comb size is 8.

[0154] Furthermore, the SRS resource parameters for positioning may include a resource mapping parameter (e.g., resourceMapping-r16). Here, the resource mapping parameter may indicate the SRS transmission start symbol within a slot. In this case, the transmission start symbol may be 0 to 13. Furthermore, the resource mapping parameter may indicate the number of symbols. For example, the number of symbols may be 1, 2, 4, 8, or 12.

[0155] The SRS resource parameters for positioning may include a frequency domain shift parameter (e.g., freqDomainShift-r16). In this case, the frequency domain shift parameter may be information related to a starting resource block (RB) in the frequency domain. For example, the RB may be 0 to 268.

[0156] The SRS resource parameter for positioning may include a group or sequence hopping parameter (e.g., groupOrSequenceHopping-r16), which may include information on whether to perform group hopping, sequence hopping, both hopping, or neither hopping for the SRS sequence.

[0157] Furthermore, the SRS resource parameters for positioning may include a resource type parameter (e.g., resourceType-r16). In this case, the resource type parameter may include information on whether the resource is aperiodic, semi-persistent, or periodic. For example, if the resource is aperiodic, the resource type parameter may include slot offset information. For another example, if the resource is semi-static or periodic, the resource type parameter may include period and offset information.

[0158] Additionally, the SRS resource parameters for positioning may include a sequence ID parameter (e.g., sequenceId-r16), which may include SRS sequence ID information.

[0159] Furthermore, the SRS resource parameters for positioning may include SRS spatial relation parameters (e.g., SRS-SpatialRelationInfoPos-r16). In this case, the SRS spatial relation parameters may include information on a reference signal to be referenced in relation to a spatial relation. For example, the reference signal to be referenced may be at least one of an SSB of a serving cell, an SSB of a neighboring cell, and a DL PRS. Furthermore, if an SSB is a reference signal to be referenced, the SRS spatial relation parameters may further include cell ID and SSB index information.

[0160] For example, a method and apparatus for performing positioning using a sidelink in a new communication system (e.g., NR) may be provided. For example, a terminal performing sidelink communication may perform sidelink communication based on at least one of in-coverage, out-of-coverage, and partial coverage. Furthermore, for example, sidelink communication may support vehicle-to-everything (V2X), public safety, commercial services, and the Industrial Internet of Things (IIoT), as described above.

[0161] Further, as an example, sidelink-based positioning may be performed based on at least one of, but not limited to, TDOA (time difference of arrival), RTT (round trip time), AOA (angle of arrival), AOD (angle of departure), and RSTD (reference signal time difference). As another example, measurements for sidelink positioning may be combined with measurements for other RAT-based positioning (e.g., Uu-based measurements), and are not limited to a specific embodiment.

[0162] Further, by way of example, when performing sidelink positioning based on a new system, it is necessary to determine signal design, resource allocation, measurements, related procedures and other matters from a physical layer perspective for reference signals for sidelink positioning, as will be described later. Further, by way of example, a method for recycling existing reference signals and reference signal-related procedures for sidelink positioning is possible, as will be described later. Based on the above, a method for performing sidelink-based positioning is described below.

[0163] FIG. 11 illustrates a method for performing sidelink-based positioning applicable to the present disclosure.

[0164] Referring to Figure 11, sidelink-based positioning may be performed. As a specific example, in Figure 11, terminal A 1120, terminal B 1130, and terminal C 1140 may be present within the coverage of base station 1110. By way of example, but not limited to, each of terminal A 1120, terminal B 1130, and terminal C 1140 may be in an RRC-connected state with base station 1110. In this case, the location of terminal D 1150 may be measured based on sidelink-based positioning.

[0165] Here, as an example, sidelink communication may be possible between terminal A 1120 and terminal D 1150. As another example, terminal A 1120, terminal B 1130, terminal C 1140, and terminal D 1150 may perform group communication-based sidelink communication based on groupcast. As an example, terminal A 1120 may be a master terminal in the group communication, but is not limited to the above-mentioned embodiment.

[0166] For convenience of explanation, the following description will be based on the above-mentioned situation as an example, but is not limited thereto. Referring to FIG. 11, a base station 1110 may transmit allocation information to a terminal A 1120, a terminal B 1130, and a terminal C 1140, respectively. In this case, the allocation information may be information required for a terminal D 1150 requiring positioning to transmit a sidelink sounding reference signal (SL SRS). For example, the allocation information may include at least one of resource and sequence information required for the terminal D 1150 to transmit the SL SRS, and may further include other information.

[0167] At this time, for example, the allocation information may be transmitted from the base station 1110 to each of the terminals A 1120, B 1130, and C 1140 by higher layer signaling (e.g., RRC). Here, for example, the allocation information may be allocated by a location server, and the allocated information may be transmitted to each terminal via the base station 1110, and this is not limited to a specific embodiment.

[0168] Terminal A 1120 may then transmit allocation information to terminal D 1150. Here, the allocation information may be information necessary for terminal D 1150 to transmit an SL SRS. At this time, for example, terminal A 1120, terminal B 1130, and terminal C 1140 may each receive the SL SRS transmitted by terminal D 1150. At this time, for example, terminal A 1120 may transmit the allocation information to terminal D 1150 over at least one of a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH), and this is not limited to a specific embodiment. Terminal D 1150 may then transmit the SL SRS, and terminal A 1120, terminal B 1130, and terminal C 1140 may each receive the SL SRS transmitted by terminal D 1150.

[0169] Thereafter, terminal A 1120, terminal B 1130, and terminal C 1140 may each perform measurement based on the SL SRS to obtain measurement information. Then, terminal A 1120, terminal B 1130, and terminal C 1140 may each transmit the measurement information to base station 1110. At this time, the measurement information is a value measured by each terminal based on the SL SRS and may be at least one of TDOA (time difference of arrival) and RSTD (reference signal time difference), but is not limited to this. As an example, terminal A 1120, terminal B 1130, and terminal C 1140 may each transmit measurement values ​​to base station 1110. Then, base station 1110 may obtain a location value of terminal D 1150 based on the measurement values ​​received from each terminal. As another example, the measurement information may be a location value of terminal D 1150 calculated based on the SL SRS transmitted by terminal D 1150. That is, the measurement information may be the measurement value itself or a location value of terminal D 1150 derived based on the measurement value, and is not limited to a specific form. Further, by way of example, but not limitation, the base station 1110 can further transmit the measurement information to a location server, and positioning can be performed as described above.

[0170] FIG. 12 illustrates a method for performing sidelink-based positioning applicable to the present disclosure.

[0171] Referring to Figure 12, sidelink-based positioning may be performed. As a specific example, in Figure 12, terminal A 1220, terminal B 1230, and terminal C 1240 may be present within the coverage of base station 1210. By way of example, but not limited to, each of terminal A 1220, terminal B 1230, and terminal C 1240 may be in an RRC-connected state with base station 1210. In this case, the location of terminal D 1250 may be measured based on sidelink-based positioning.

[0172] Here, as an example, sidelink communication may be possible between terminal A 1220 and terminal D 1250. As another example, terminal A 1220, terminal B 1230, terminal C 1240, and terminal D 1250 may perform group communication-based sidelink communication based on groupcast. As an example, terminal A 1220 may be a master terminal in the group communication, but is not limited to the above-mentioned embodiment.

[0173] For convenience of explanation, the following description will be based on the above-mentioned situation, but is not limited thereto. Referring to FIG. 12, the terminal D 1250 may transmit request information to the terminal A 1220. At this time, the request information may be information requesting location measurement of the terminal D 1250. Thereafter, the terminal A 1220 may transmit the request information to the base station 1210 based on the request information acquired from the terminal D 1250. Here, as an example, the base station 1210 may transmit the received request information to a location server, but is not limited to the above-mentioned embodiment.

[0174] Thereafter, the base station 1210 may transmit allocation information for the SL SRS to each terminal based on the request information. As another example, the base station 1210 may receive allocation information for the SL SRS from the location server based on the request information and transmit the allocation information based on the received information, and this is not limited to the above-described embodiment.

[0175] Thereafter, base station 1210 may transmit allocation information to terminal A 1220, terminal B 1230, and terminal C 1240. In this case, the allocation information may be information necessary for terminal D 1250, which requires positioning, to transmit the SL SRS. For example, the allocation information may include at least one of resource and sequence information necessary for terminal D 1250 to transmit the SL SRS, but may also include other information.

[0176] At this time, for example, the allocation information may be transmitted from the base station 1210 to each of the terminals A 1220, B 1230, and C 1240 by higher layer signaling (e.g., RRC). Here, for example, the allocation information may be allocated by a location server, and the allocated information may be transmitted to each terminal via the base station 1210, and this is not limited to a specific embodiment.

[0177] Terminal A 1220 may then transmit allocation information to terminal D 1250. Here, the allocation information may be information necessary for terminal D 1250 to transmit an SL SRS. At this time, for example, terminal A 1220, terminal B 1230, and terminal C 1240 may each receive the SL SRS transmitted by terminal D 1250. At this time, for example, terminal A 1220 may transmit the allocation information to terminal D 1250 over at least one of a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH), and this is not limited to a specific embodiment. Terminal D 1250 may then transmit the SL SRS, and terminal A 1220, terminal B 1230, and terminal C 1240 may each receive the SL SRS transmitted by terminal D 1250.

[0178] Thereafter, terminal A 1220, terminal B 1230, and terminal C 1240 may each perform measurements based on the SL SRS to obtain measurement information. Then, terminal A 1220, terminal B 1230, and terminal C 1240 may each transmit the measurement information to base station 1210. At this time, the measurement information is a value measured by each terminal based on the SL SRS and may be at least one of TDOA and RSTD, but is not limited thereto. As an example, terminal A 1220, terminal B 1230, and terminal C 1240 may each transmit measurement values ​​to base station 1210. Then, base station 1210 may obtain a location value of terminal D 1250 based on the measurement values ​​received from each terminal. As another example, the measurement information may be a location value of terminal D 1250 calculated based on the SL SRS transmitted by terminal D 1250. That is, the measurement information may be the measurement value itself or a location value of terminal D 1250 derived based on the measurement value, and is not limited to a specific form. Further, by way of example, but not limitation, the base station 1210 can further transmit the measurement information to a location server, and positioning can be performed as described above.

[0179] FIG. 13 illustrates a method for performing sidelink-based positioning applicable to the present disclosure.

[0180] Referring to Figure 13, sidelink-based positioning may be performed. As a specific example, in Figure 13, terminal A 1320 may be present within the coverage of base station 1310. As an example, but not limited to, terminal A 1320 may be in an RRC-connected state with base station 1310. At this time, the location of terminal D 1350 may be measured based on sidelink-based positioning.

[0181] Here, as an example, sidelink communication may be possible between terminal A 1320 and terminal B 1330, between terminal A 1320 and terminal C 1340, and between terminal A 1320 and terminal D 1350. As another example, terminal A 1320, terminal B 1330, terminal C 1340, and terminal D 1350 may perform group communication-based sidelink communication based on groupcast. As an example, terminal A 1320 may be a master terminal in the group communication, but is not limited to the above-mentioned embodiment.

[0182] For convenience of explanation, the following description will be based on the above-mentioned situation, but is not limited thereto. Referring to FIG. 13, a base station 1310 may transmit allocation information to a terminal A 1320. At this time, the allocation information may be information necessary for a terminal D 1350 requiring positioning to transmit an SL SRS. For example, the allocation information may include at least one of resource and sequence information necessary for the terminal D 1350 to transmit the SL SRS, and may further include other information.

[0183] At this time, for example, the allocation information may be transmitted from the base station 1310 to the terminal A 1320 by higher layer signaling (e.g., RRC). At this time, since the terminal A 1320 is within the coverage of the base station 1310 and is in an RRC connected state, the terminal A 1320 can receive the allocation information from the base station 1310. Furthermore, for example, the allocation information may be allocated by a location server, and the allocation information may be transmitted to each terminal via the base station 1310, and this is not limited to a specific embodiment.

[0184] Terminal A 1320 may then transmit allocation information to each of terminal B 1330 and terminal C 1340. At this time, the allocation information may be information necessary for terminal D 1350, which requires positioning, to transmit an SL SRS. As an example, the allocation information may include at least one of resource and sequence information necessary for terminal D 1350 to transmit the SL SRS, but may also include other information. That is, each of terminal B 1330 and terminal C 1340 may receive the above-mentioned allocation information from terminal A 1320 in order to receive the SL SRS from terminal D 1350. At this time, as an example, terminal A 1320 may transmit the allocation information to each of terminal B 1330 and terminal C 1340 via at least one of a PSCCH and a PSSCH, and this is not limited to a specific embodiment. Also, terminal A 1320 may transmit the allocation information to terminal D 1350. That is, terminal A 1330 may transmit the allocation information as information necessary for terminal D 1350 to transmit an SL SRS. At this time, as an example, terminal A 1320 may transmit allocation information to terminal D 1350 via at least one of a PSCCH and a PSSCH, and is not limited to a specific embodiment. Based on the above, terminal D 1350 may transmit an SL SRS, and terminal A 1320, terminal B 1330, and terminal C 1340 may each receive the SL SRS transmitted by terminal D 1350.

[0185] Thereafter, terminal A 1320, terminal B 1330, and terminal C 1340 can each perform measurements based on the SL SRS and obtain measurement information. At this time, terminal B 1330 and terminal C 1340 can each transmit the measurement information to terminal A 1320. At this time, the measurement information is a value measured by each terminal based on the SL SRS and may be at least one of TDOA and RSTD, but is not limited to this. As an example, the measurement information may be the measurement value itself or a location value of terminal D 1350 derived based on the measurement value, and is not limited to a specific form. More specifically, terminal A 1320 can obtain measurement values ​​measured based on the SL SRS from terminal B 1330 and terminal C 1340 as measurement information. At this time, terminal A 1320 can obtain a location value of terminal D 1350 based on the measurement values ​​obtained from terminal B 1330 and terminal C 1340. At this time, terminal A 1320 can transmit the location value of terminal D 1350 to base station 1310 as measurement information. At this time, the base station 1310 can report the measurement information as the location value of the terminal D 1350 to the location server, and is not limited to a specific embodiment.

[0186] As another example, terminal A 1320 may acquire measurement values ​​measured based on SL SRS from terminal B 1330 and terminal C 1340 as measurement information. At this time, terminal A 1320 may transmit the measurement values ​​measured by terminal A 1320 based on SL SRS together with the measurement values ​​acquired from terminal B 1330 and terminal C 1340 to base station 1310. At this time, base station 1310 may acquire a location value of terminal D 1350 based on the measurement values ​​of terminal A 1320, terminal B 1330, and terminal C 1340. As an example, base station 1310 may report the measurement information as a location value of terminal D 1350 to a location server, and this is not limited to a specific embodiment.

[0187] As another example, terminal A 1320 may acquire, as measurement information, a location value of terminal D 1350 derived from measurements made by terminal B 1330 and terminal C 1340 based on SL SRS, and may be able to transmit this to base station 1310. As an example, base station 1310 may report the measurement information as a location value of terminal D 1350 to a location server, and this is not limited to a specific embodiment. Positioning can be performed as described above.

[0188] FIG. 14 illustrates a method for performing sidelink-based positioning applicable to the present disclosure.

[0189] Referring to Figure 14, sidelink-based positioning may be performed. As a specific example, in Figure 14, terminal A 1420 may be present within the coverage of base station 1410. As an example, but not limited to, terminal A 1420 may be in an RRC-connected state with base station 1410. At this time, the location of terminal D 1450 may be measured based on sidelink-based positioning.

[0190] Here, as an example, sidelink communication may be possible between terminal A 1420 and terminal B 1430, between terminal A 1420 and terminal C 1440, and between terminal A 1420 and terminal D 1450. As another example, terminal A 1420, terminal B 1430, terminal C 1440, and terminal D 1450 may perform group communication-based sidelink communication based on groupcast. As an example, terminal A 1420 may be a master terminal in the group communication, but is not limited to the above-mentioned embodiment.

[0191] For convenience of explanation, the following description will be based on the above-mentioned situation, but is not limited thereto. Referring to FIG. 14, terminal D 1450 may transmit request information to terminal A 1420. At this time, the request information may be information requesting location measurement of terminal D 1450. Thereafter, terminal A 1420 may transmit request information to base station 1410 based on the request information acquired from terminal D 1450. Here, as an example, base station 1410 may transmit the received request information to a location server, but is not limited to the above-mentioned embodiment.

[0192] Thereafter, the base station 1410 may transmit allocation information for the SL SRS to each terminal based on the request information. As another example, the base station 1410 may receive allocation information for the SL SRS from the location server based on the request information and transmit the allocation information based on the received information, and this is not limited to the above-described embodiment.

[0193] 14, a base station 1410 may transmit allocation information to a terminal A 1420. In this case, the allocation information may be information necessary for a terminal D 1450 requiring positioning to transmit an SL SRS. For example, the allocation information may include at least one of resource and sequence information necessary for the terminal D 1450 to transmit the SL SRS, but may also include other information.

[0194] At this time, for example, the allocation information may be transmitted from the base station 1410 to the terminal A 1420 by higher layer signaling (e.g., RRC). At this time, since the terminal A 1420 is within the coverage of the base station 1410 and is in an RRC connected state, the terminal A 1420 can receive the allocation information from the base station 1410. Furthermore, for example, the allocation information may be allocated by a location server, and the allocation information may be transmitted to each terminal via the base station 1410, and this is not limited to a specific embodiment.

[0195] Terminal A 1420 may then transmit allocation information to each of terminal B 1430 and terminal C 1440. At this time, the allocation information may be information necessary for terminal D 1450, which requires positioning, to transmit an SL SRS. As an example, the allocation information may include at least one of resource and sequence information necessary for terminal D 1450 to transmit the SL SRS, but may also include other information. That is, each of terminal B 1430 and terminal C 1440 may receive the above-mentioned allocation information from terminal A 1420 in order to receive the SL SRS from terminal D 1450. At this time, as an example, terminal A 1420 may transmit the allocation information to each of terminal B 1430 and terminal C 1440 via at least one of a PSCCH and a PSSCH, and this is not limited to a specific embodiment. Also, terminal A 1420 may transmit the allocation information to terminal D 1450. That is, terminal A 1420 may transmit the allocation information as information necessary for terminal D 1450 to transmit an SL SRS. At this time, as an example, terminal A 1420 may transmit allocation information to terminal D 1450 via at least one of a PSCCH and a PSSCH, and is not limited to a specific embodiment. Based on the above, terminal D 1450 may transmit an SL SRS, and terminal A 1420, terminal B 1430, and terminal C 1440 may each receive the SL SRS transmitted by terminal D 1450.

[0196] Thereafter, terminal A 1420, terminal B 1430, and terminal C 1440 may each perform measurements based on the SL SRS and obtain measurement information. At this time, terminal B 1430 and terminal C 1440 may each transmit the measurement information to terminal A 1420. At this time, the measurement information is a value measured by each terminal based on the SL SRS and may be at least one of TDOA and RSTD, but is not limited thereto. As an example, the measurement information may be the measurement value itself or a location value of terminal D 1450 derived based on the measurement value, and is not limited to a specific form. More specifically, terminal A 1420 may obtain, as measurement information, measurement values ​​measured based on the SL SRS from terminal B 1430 and terminal C 1440. At this time, terminal A 1420 may obtain a location value of terminal D 1450 based on the measurement values ​​obtained from terminal B 1430 and terminal C 1440. At this time, terminal A 1420 may transmit the location value of terminal D 1450 to base station 1410 as measurement information. At this time, the base station 1410 can report the measurement information as the location value of the terminal D 1450 to the location server, and is not limited to a specific embodiment.

[0197] As another example, terminal A 1420 may acquire measurement values ​​measured based on SL SRS from terminal B 1430 and terminal C 1440 as measurement information. At this time, terminal A 1420 may transmit the measurement values ​​measured by terminal A 1420 based on SL SRS together with the measurement values ​​acquired from terminal B 1430 and terminal C 1440 to base station 1410. At this time, base station 1410 may acquire a location value of terminal D 1450 based on the measurement values ​​of terminal A 1420, terminal B 1430, and terminal C 1440. As an example, base station 1410 may report the measurement information as a location value of terminal D 1450 to a location server, and this is not limited to a specific embodiment.

[0198] As another example, terminal A 1420 may acquire, as measurement information, a location value of terminal D 1450 derived from measurements made by terminal B 1430 and terminal C 1440 based on SL SRS, and may be able to transmit this to base station 1410. As an example, base station 1410 may report the measurement information as a location value of terminal D 1450 to a location server, and this is not limited to a specific embodiment. Positioning can be performed as described above.

[0199] FIG. 15 illustrates a method for performing sidelink-based localization applicable to the present disclosure.

[0200] Referring to FIG. 15, sidelink-based positioning may be performed. As a specific example, in FIG. 15, positioning may be performed based on sidelink communication between terminals without the control of a base station. For example, the location of terminal D 1540 may be measured based on sidelink-based positioning. Here, for example, sidelink communication may be possible between terminal A 1510 and terminal B 1520, sidelink communication may be possible between terminal A 1510 and terminal C 1530, and sidelink communication may be possible between terminal A 1510 and terminal D 1540. As another example, terminal A 1510 may perform group communication-based sidelink communication based on groupcast. For example, terminal A 1510 may be a master terminal in group communication, but this is not limited to the above-mentioned embodiment. Note that the following description will be based on the above-mentioned situation for convenience of explanation, but is not limited thereto. Referring to FIG. 15, terminal A 1510 may generate allocation information. In this case, the allocation information may be information necessary for terminal D 1540, which requires positioning, to transmit an SL SRS. As an example, the allocation information may include at least one of resource and sequence information required for the terminal D 1540 to transmit the SL SRS, but may also include other information.

[0201] At this time, for example, terminal A 1510 may transmit allocation information to each of terminal B 1520 and terminal C 1530. In this case, the allocation information may be information necessary for terminal D 1540, which requires positioning, to transmit an SL SRS. For example, the allocation information may include at least one of resource and sequence information necessary for terminal D 1540 to transmit the SL SRS, but may also include other information. That is, each of terminal B 1520 and terminal C 1530 may receive the above-mentioned allocation information from terminal A 1510 in order to receive the SL SRS from terminal D 1540. At this time, for example, terminal A 1510 may transmit the allocation information to each of terminal B 1520 and terminal C 1530 via at least one of a PSCCH and a PSSCH, and this is not limited to a specific embodiment. Also, terminal A 1510 may transmit the allocation information to terminal D 1540. That is, terminal A 1510 may transmit the allocation information as information necessary for terminal D 1540 to transmit an SL SRS. At this time, as an example, terminal A 1510 may transmit allocation information to terminal D 1540 via at least one of a PSCCH and a PSSCH, and is not limited to a specific embodiment. Based on the above, terminal D 1540 may transmit an SL SRS, and terminal A 1510, terminal B 1520, and terminal C 1530 may each receive the SL SRS transmitted by terminal D 1540.

[0202] Thereafter, each of terminal A 1510, terminal B 1520, and terminal C 1530 can perform measurements based on the SL SRS and obtain measurement information. At this time, each of terminal B 1520 and terminal C 1530 can transmit the measurement information to terminal A 1510. At this time, the measurement information is a value measured by each terminal based on the SL SRS, and may be at least one of TDOA and RSTD, but is not limited thereto. As an example, the measurement information may be the measurement value itself or a location value of terminal D 1540 derived based on the measurement value, and is not limited to a specific form. More specifically, terminal A 1510 can obtain measurement values ​​measured based on the SL SRS from terminal B 1520 and terminal C 1530 as measurement information. At this time, terminal A 1510 can obtain a location value of terminal D 1540 based on the measurement values ​​obtained from terminal B 1520 and terminal C 1530.

[0203] As another example, terminal A 1510 may acquire, as measurement information, a location value of terminal D 1540 derived from measurements made by terminal B 1520 and terminal C 1530 based on SL SRS, and positioning may be performed as described above, without being limited to a specific embodiment.

[0204] FIG. 16 illustrates a method for performing sidelink-based positioning applicable to the present disclosure.

[0205] Referring to FIG. 16, sidelink-based positioning may be performed. As a specific example, in FIG. 16, positioning may be performed based on sidelink communication between terminals without the control of a base station. For example, the location of terminal D 1640 may be measured based on sidelink-based positioning. Here, for example, sidelink communication may be possible between terminal A 1610 and terminal B 1620, sidelink communication may be possible between terminal A 1610 and terminal C 1630, and sidelink communication may be possible between terminal A 1610 and terminal D 1640. As another example, terminal A 1610 may perform group communication-based sidelink communication based on groupcast. For example, terminal A 1610 may be a master terminal in group communication, but is not limited to the above-mentioned embodiment. Note that, for convenience of explanation, the following description will be based on the above-mentioned situation, but is not limited thereto. Referring to FIG. 16, terminal D 1640 may transmit request information to terminal A 1610. At this time, the request information may be information requesting positioning of terminal D 1640, but is not limited to the above-mentioned embodiment.

[0206] Terminal A 1610 may then generate allocation information. At this time, the allocation information may be information necessary for terminal D 1640 requiring positioning to transmit an SL SRS. For example, the allocation information may include at least one of resource and sequence information necessary for terminal D 1640 to transmit an SL SRS, but may also include other information.

[0207] At this time, for example, terminal A 1610 can transmit allocation information to each of terminal B 1620 and terminal C 1630. In this case, the allocation information can be information necessary for terminal D 1640, which requires positioning, to transmit an SL SRS. For example, the allocation information can include at least one of resource and sequence information necessary for terminal D 1640 to transmit the SL SRS, but can also include other information. That is, each of terminal B 1620 and terminal C 1630 can receive the above-mentioned allocation information from terminal A 1610 in order to receive the SL SRS from terminal D 1640. At this time, for example, terminal A 1610 can transmit the allocation information to each of terminal B 1620 and terminal C 1630 via at least one of a PSCCH and a PSSCH, and this is not limited to a specific embodiment. Also, terminal A 1610 can transmit the allocation information to terminal D 1640. That is, terminal A 1610 can transmit the allocation information as information necessary for terminal D 1640 to transmit an SL SRS. At this time, as an example, terminal A 1610 may transmit allocation information to terminal D 1640 via at least one of a PSCCH and a PSSCH, and is not limited to a specific embodiment. Based on the above, terminal D 1640 may transmit an SL SRS, and terminal A 1610, terminal B 1620, and terminal C 1630 may each receive the SL SRS transmitted by terminal D 1640.

[0208] Thereafter, each of terminal A 1610, terminal B 1620, and terminal C 1630 can perform measurements based on the SL SRS and obtain measurement information. At this time, each of terminal B 1620 and terminal C 1630 can transmit the measurement information to terminal A 1610. At this time, the measurement information is a value measured by each terminal based on the SL SRS, and may be at least one of TDOA and RSTD, but is not limited thereto. As an example, the measurement information may be the measurement value itself or a location value of terminal D 1640 derived based on the measurement value, and is not limited to a specific form. More specifically, terminal A 1610 can obtain measurement values ​​measured based on the SL SRS from terminal B 1620 and terminal C 1630 as measurement information. At this time, terminal A 1610 can obtain a location value of terminal D 1640 based on the measurement values ​​obtained from terminal B 1620 and terminal C 1630.

[0209] As another example, terminal A 1610 may acquire, as measurement information, a location value of terminal D 1640 derived from measurements made by terminal B 1620 and terminal C 1630 based on SL SRS, and positioning may be performed as described above, without being limited to a specific embodiment.

[0210] 11 to 16, the allocation information may include at least one of sequence information and resource information of the SL SRS transmitted by terminal D, as described above. In this case, as an example, an existing SRS sequence may be considered in relation to the generation of the SL SRS sequence, and the existing SRS sequence may be derived based on Equation 3 and Equation 4.

[0211] For example, a sequence group u for an SRS sequence may be expressed as in Equation 6 below. In this case, the sequence group u and the sequence number v may be determined based on the upper layer parameter groupOrSequenceHopping. In this case, for example, l' is an OFDM symbol number included in the SRS resource, It could be JPEG2025531775000023.jpg1061.

[0212]

number

[0213] Furthermore, as an example, when the groupOrSequenceHopping parameter is set to 'neither', the sequence group and sequence number can be set as shown in the following Equation 7. That is, it is not necessary to use both the sequence group and the sequence number. On the other hand, when the groupOrSequenceHopping parameter is set to 'groupHopping', group hopping is applied but sequence hopping does not have to be applied, which can be shown in the following Equation 8. In this case, the initial value c of the pseudo-random sequence c(i) is init is the start of each radio frame It could be JPEG2025531775000025.jpg711.

[0214]

number

[0215]

number

[0216] Furthermore, as an example, when the groupOrSequenceHopping parameter is 'sequenceHopping', only sequence hopping is applied, and group hopping may not be applied, as shown in Equation 9 below. In this case, the initial value c of the pseudo-random sequence c(i) is init is the start of each radio frame It could be JPEG2025531775000028.jpg711.

[0217]

number

[0218] In this case, for example, the above-mentioned groupOrSequenceHopping parameter may be included in the SRS-Resource IE or the SRS-PosResource IE. JPEG2025531775000030.jpg711 can be determined based on the sequence ID as an upper layer parameter. Here, if the sequence ID parameter is included in the SRS-Resource IE, On the other hand, if the sequenceID parameter is an SRS-PosResource IE, JPEG2025531775000032.jpg1065. That is, when generating a sequence of SRSs for positioning, the SRS sequence ID range may be wider.

[0219] For example, as described above with reference to Figures 11 to 16, the SRS sequence ID of the SL SRS used for sidelink positioning can be transmitted from the base station to the terminal through upper end signaling such as upper layer signaling (e.g., RRC) in the same manner as the existing SRS for positioning. In this case, the SRS sequence ID of the SL SRS can be transmitted as follows: 11 to 16, the sequence ID information of the SL SRS may be included in the allocation information as the sequence information of the SL SRS transmitted for positioning of the terminal D. However, as an example, the sequence ID of the SL SRS may be assigned from the remaining sequence IDs, excluding the SRS ID assigned to the UL SRS, in order to distinguish it from the existing SRS for positioning.

[0220] As another example, the sequence ID information of the SRS can be provided to the terminal from the base station through higher layer signaling (e.g., RRC). Therefore, although the terminal can acquire the sequence ID information in the above-described Figures 11 to 14, a terminal that performs sidelink communication without the control of the base station, as in Figures 15 and 16, may not be able to acquire the SRS ID information. Therefore, in the above-described Figures 15 to 16, the terminal needs to determine the SRS ID by itself.

[0221] At this time, for example, the SRS ID is N of terminal D. X ID For example, in the above configuration, terminal A can determine N based on the sidelink communication between terminal A and terminal D. X ID In this case, for example, the SRS ID can be configured based on X ID is a decimal number of the CRC of the PSCCH related to the PSSCH, and may be expressed as, but not limited to, Equation 10 below. i is each parity bit, and L may be the number of parity bits.

[0222]

number

[0223] Here, N for terminal D X ID is a modular function, modular 2 16 The SRS ID is calculated based on the above and consists of 16 bits.

[0224] As another example, N X ID For example, the SRS ID can be configured based on N bits. X ID It may be composed of bits.

[0225] As another example, a case can be considered in which the ID of terminal A is used. In this case, the ID of terminal A is included in a sidelink assignment (SA) and the indicated ID is "n SA ID (sidelink group destination identity), but is not limited to this. In this case, if the SRS ID is configured based on 16 bits, n SA ID As another example, the SRS ID can be configured as n SA ID can be constructed based on the SRS ID, which is applied based on a modular function, so n SA ID It may be composed of the following bits.

[0226] As another example, the allocation information may include at least one of sequence information and resource information for the SL SRS transmitted by terminal D with reference to Figures 11 to 16, as described above. At this time, for example, existing SRS resource allocation parameters may be considered in relation to the SL SRS resource allocation information. More specifically, the resource allocation parameters for the SL SRS included in the allocation information may be generated based on the above-mentioned SRS-PosResourceSet and SRS-PosResource. For example, as a resource set for the SL SRS for positioning, parameters in SL-SRS-PosResourceSet may include parameters based on parameters in SRS-PosResourceSet. Furthermore, for example, as resources for the SL SRS for positioning, parameters of SL-SRS-PosResource may include parameters based on parameters in SRS-PosResource.

[0227] However, SL-SRS PosResourceSet and SL-SRS PosResource need to be distinguished from SRS PosResourceSet and SRS-PosResource, which are intended for transmission to existing base stations. Considering the above, SL-SRS PosResourceSet can be configured separately so as to be distinguishable from SRS PosResourceSet. In this case, SL-SRS PosResourceSet can use resources other than the resources (SRS-PosResource) used by SRS PosResourceSet. For example, suppose SRS PosResourceSet is configured with Set A, Set B, and Set C, and the resources (SRS-PosResource) in each SRS PosResourceSet are designated as {A-1, A-2, A-3, ..., AK}. A}, {B-1, B-2, B-3, …, BK B}, {C-1, C-2, C-3, …, CK C}, the SL-SRS PosResourceSet must consist of Set A, Set B, and another Set D that does not contain any of the resources (SRS-PosResource) that Set C contains.

[0228] In this case, for example, when sidelink-based positioning is performed based on the base station under the control of the base station as shown in Figures 11 to 14, the base station may allocate SRS resources for the sidelink separately from SRS resources to be transmitted by the base station. However, for example, when the terminal generates allocation information without the control of the base station as shown in Figures 15 and 16, a usable resource (SL-SRS-PosResource) from a configured resource (SL-SRS-PosResourceSet) separate from the SRS resource to be transmitted by the base station may be pre-defined in the terminal. In this case, the terminal may select a resource for SL SRS transmission from the usable resource (SL-SRS-PosResource) based on the pre-defined resource.

[0229] Positioning in the new communication system can be performed based on at least one of downlink / uplink, time difference / angle difference, RTT, and cell ID. Regarding the downlink PRS (DL PRS) for positioning, a DL PRS resource set can be configured for one base station (or transmission reception point, TRP). Here, the DL PRS resource set can be a collection of DL PRS resources. Each DL PRS resource in the DL PRS resource set can have its own DL PRS resource ID. For example, in a new communication system (e.g., NR), each base station (or TRP) can communicate using multiple beams. Here, each DL PRS resource ID can correspond to each beam transmitted by one base station (or TRP). That is, each DL PRS resource in the DL PRS resource set can correspond to each beam.

[0230] Here, the DL PRS configuration may include a DL PRS transmission schedule. This allows the base station (or TRP) to instruct the DL PRS configuration to the terminal. Therefore, the terminal can confirm the DL PRS based on the instructed DL PRS configuration without performing blind detection. The pneumology for the DL PRS may be the same as the pneumology for data transmission. For example, the CP length and subcarrier spacing (SCS) for the DL PRS may be the same as the CP length and SCS for data transmission.

[0231] Furthermore, one or more base stations (or TRPs) may transmit DL PRS resource sets over a positioning frequency layer. Since the DL PRS resource sets are transmitted over the same positioning frequency layer, the SCS, CP type, center frequency, Point A, bandwidth, starting physical resource block (PRB), and comb size may be set to be the same. Here, Point A may be a value indicating the position of resource block 0 (RB0). The DL PRS resource sets may be transmitted over the same frequency layer. Here, the DL PRS sequence may be a Gold sequence, which may be a binary sequence. This may be the same as the DL PRS sequence of the existing system. The DL PRS sequence ID may be 4096, which may be more than the 1024 sequence for a cell ID in NR. The DL PRS may also be modulated based on Quadrature Phase Shift Keying (QPSK) and transmitted based on Cyclic-Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM). Furthermore, the time axis resource of DL PRS can be set to 12 symbols within one slot, and the konbu size can be supported up to konbu-12.

[0232] More specific details may be as shown in Table 14 below. That is, the interval at which PRS is allocated on the frequency axis may vary depending on the comb size. In an LTE system, a DL PRS can be transmitted using all symbols within one slot. However, in an NR system, which is a new communication system, a DL PRS may be transmitted based on different numbers of symbols as shown in Table 14 below.

[0233] [Table 14]

[0234] The DL PRS transmission period can be configured for each DL PRS resource set. For example, each base station (or TRP) can configure multiple DL PRS resource sets. The same base station (or TRP) can have multiple DL PRS resource sets with different periods, and the periods can be configured differently.

[0235] Resources allocated for transmission of DL PRS (hereinafter referred to as DL PRS resources) may be repeated 1, 2, 4, 6, 8, 16, or 32 times. The interval between each repeated DL PRS resource may be set to any of 1, 2, 4, 8, 16, and 32 slots, but is not limited to the above-mentioned embodiment.

[0236] In relation to frequency allocation for the DL PRS resource, the DL PRS bandwidth granularity may be 4 PRBs. The starting PRB may be indicated to the terminal as a parameter, and the terminal may determine the starting PRB based on the indicated parameter. As an example, the minimum bandwidth for the DL PRS may be 24 PRBs, and the maximum bandwidth may be 272 PRBs.

[0237] A resource element (RE) offset can be configured on the frequency axis in relation to the DL PRS. In this case, the RE offset can be configured to have a certain offset on the frequency axis based on a comb pattern with reference to the first symbol of the DL PRS resource. The first symbol can be configured for the UE. Thereafter, the remaining symbols can be determined based on the RE offset with reference to the first symbol.

[0238] FIG. 17 is a diagram showing a kelp pattern applicable to the present disclosure.

[0239] Referring to FIG. 17, a DL PRS RE pattern when the cone size and the number of symbols are equal is shown, which will be described as an example.

[0240] More specifically, when the comb size is 2 (Comb-2), the DL PRS can be allocated to two symbols (0,1). In this case, the RE offset can be {0,1}. That is, the DL PRS can be allocated to the first and second symbols with an RE offset of {0,1}, and the frequency axis can be allocated based on the comb size of 2. When the comb size is 4 (Comb-4), the DL PRS can be allocated to four symbols (0,1,2,3). In this case, the RE offset can be {0,2,1,3}. That is, the DL PRS can be allocated to the first to fourth symbols with an RE offset of {0,2,1,3}, and the frequency axis can be allocated based on the comb size of 4. When the comb size is 6 (Comb-6), the DL PRS can be allocated to six symbols (0,1,2,3,4,5). In this case, the RE offset can be {0,3,1,4,2,5}. That is, DL PRSs are allocated from the first symbol to the sixth symbol by RE offsets {0, 3, 1, 4, 2, 5}, and the frequency axis can be allocated based on a comb size of 6.

[0241] The present invention can support DL PRS muting. When a terminal receives an instruction to mute a DL PRS, the terminal can mute the DL PRS. Here, a DL PRS muting bitmap for a DL PRS resource set can be configured, and the DL PRS to be muted can be instructed to the terminal based on the DL PRS muting bitmap. In this case, each bit in the DL PRS muting bitmap (hereinafter referred to as Option 1 bitmap) can correspond to each occasion or consecutive instances in the DL PRS resource set. In this case, if a specific bit indicates muting, all DL PRSs in the occasion or consecutive instances corresponding to the specific bit can be muted.

[0242] Furthermore, a muting bitmap (hereinafter referred to as "Option 2 Bitmap") can indicate muting for each DL PRS resource within an occasion or instance for one period. Each bit in the bitmap corresponds to a repetition index for each DL PRS resource within an occasion or instance for one period. That is, each bit corresponds to one repetition of the DL PRS within each DL PRS period, and each bit can indicate muting. As an example, the bitmap can be set to any of 2, 4, 8, 16, or 32 bits.

[0243] In relation to the muting option, at least one of an option 1 bitmap and an option 2 bitmap can be set. As an example, only the option 1 bitmap can be set. As another example, only the option 2 bitmap can be set. As a further example, both the option 1 bitmap and the option 2 bitmap can be set. In this case, if both the option 1 bitmap and the option 2 bitmap are set, all DL PRS resources in an occasion for which muting is instructed based on option 1 are muted, and DL PRS resources in which muting is instructed by the option 2 bitmap among occasions for which muting is not instructed by the option 1 bitmap can be muted.

[0244] In a new communication system (e.g., NR), DL PRSs are generated to perform positioning measurement. Referring to Table 14 above, there can be 12 fully orthogonal resources within one slot. When the comb size is 2 (comb-2), if DL PRSs are assigned to two symbols, there are two orthogonal resources, which can be further divided into six based on a symbol offset. When the comb size is 4 (comb-4), if DL PRSs are assigned to two symbols, there are four orthogonal resources, which can be further divided into three based on a symbol offset. When the comb size is 6 (comb-6), if DL PRSs are assigned to six symbols, there are six orthogonal resources, which can be further divided into two based on a symbol offset. Also, if the comb size is 12 (comb-12) and DL PRSs are allocated to 12 symbols, there are 12 orthogonal resources, and only one can be partitioned based on the symbol offset.

[0245] Regarding the DL PRS, the new communication system can support up to 64 TRPs in one frequency layer, and 64 resources can be allocated to each TRP. In consideration of this, the DL PRS ID can be 4096 (64*64).

[0246] As an example, when a terminal operates based on an IIoT scenario in the 120 kHz band, considering the scenarios in Tables 9 and 10 described above, 18 TRPs can be supported. In this case, considering that 64 beams are supported per TRP, each of 64 resources can be supported for a DL PRS. Therefore, the total required resources may be 1152 (18 * 64). Here, a fully orthogonal resource in one slot is 12 symbol inverts. Therefore, considering 1152 resources, 96 slots (1152 / 12 = 96) may be required. In this case, 96 slots may correspond to 12 ms at 120 kHz.

[0247] Meanwhile, considering the IIoT scenario, the delay requirement for positioning can be set to 10 ms or less as mentioned above. Therefore, if 96 slots corresponding to 12 ms are used, the delay requirement (10 ms) may not be met. Therefore, a method for efficiently allocating DL PRS resources may be required.

[0248] 18 and 19 are diagrams illustrating a method for performing cyclic prefixing based on a DL PRS allocation pattern applicable to the present disclosure. When performing both frequency-axis cyclic prefixing and time-axis cyclic prefixing on a DL PRS allocation pattern, orthogonality may be lost due to collision. Therefore, when performing cyclic prefixing based on a DL PRS allocation pattern, only frequency-axis cyclic prefixing may be possible.

[0249] Referring to Figure 18, when the comb size is 6 and the patterns for allocating DL PRS to 6 symbols are {0, 3, 1, 4, 2, 5}, 6 patterns are possible with frequency axis cyclic prefix. Figure 18 may show resource allocation methods when f=0 and when f=2.

[0250] 19, when the comb size is 12 and the pattern for allocating DL PRS to 12 symbols is {0, 6, 3, 9, 1, 7, 4, 10, 2, 8, 5, 11}, 12 patterns may be possible with frequency axis cyclic prefix. FIG. 7 may show resource allocation methods when f=0 and when f=2.

[0251] FIG. 20 is a diagram illustrating a DL PRS resource allocation method applicable to the present disclosure.

[0252] The communication system according to the present invention can support DL PRS muting. When a terminal receives an instruction to mute a DL PRS, the terminal can mute the DL PRS. Here, a DL PRS muting bitmap for a DL PRS resource set can be configured, and the DL PRS to be muted can be instructed to the terminal based on the DL PRS muting bitmap. In this case, each bit in the DL PRS muting bitmap (hereinafter referred to as Option 1 bitmap) can correspond to each occasion or consecutive instances in the DL PRS resource set. Here, each DL PRS occasion can correspond to the entire DL PRS resources (including repeated transmissions) in each DL PRS period. That is, one DL PRS occasion can correspond to one DL PRS period.

[0253] In this case, if a specific bit indicates muting, all DL PRSs in the occasion or consecutive instances corresponding to the specific bit can be muted. As an example, DL PRSs in the existing system (LTE) can also be muted on an occasion-by-occasion basis, as described above. As another example, a bitmap indicating muting (hereinafter referred to as Option 2 bitmap) can indicate muting for each DL PRS resource in an occasion or instance for one period. Here, each bit in the bitmap corresponds to a repetition index of each DL PRS resource in an occasion or instance for one period (i.e., each bit corresponds to one repetition of the DL PRS in each DL PRS period), and muting can be indicated by each bit. In this case, the bitmap can be set to any of 2, 4, 8, 16, or 32 bits.

[0254] As an example, in relation to the muting option, at least one of an option 1 bitmap and an option 2 bitmap can be set. As an example, only the option 1 bitmap can be set. Furthermore, only the option 2 bitmap can be set. As an example, both the option 1 bitmap and the option 2 bitmap can be set. In this case, if both the option 1 bitmap and the option 2 bitmap are set, all DL PRS resources in an occasion where muting is instructed based on option 1 can be muted, and DL PRS resources in an occasion where muting is not instructed and muted by the option 2 bitmap can be muted.

[0255] Referring to FIG. 20(a), the UE can confirm the DL PRS period and offset indicated based on the DL PRS configuration. In FIG. 20(a), the period is set to 10 slots and the offset is set to 2 slots, but this is merely an example and is not limited to the above-described embodiment. In addition, the UE can confirm the repetition pattern of DL PRS resources within a period through 'DL-PRS-ResourceRepetitionFactor' indicated based on the DL PRS configuration. Note that 'DL-PRS-ResourceRepetitionFactor' is set to indicate two repetitions, but this is merely an example and is not limited to the above-described embodiment. The UE can confirm the time interval between DL PRS resources within one period through 'DL-PRS-ResourceTimeGap' indicated based on the DL PRS configuration. As an example, in FIG. 20(a), 'DL-PRS-ResourceTimeGap' is set to one slot, but this is merely an example and is not limited to the above-described embodiment.

[0256] Referring to Figure 20(b), the terminal can perform muting based on the option 1 bitmap. For example, the option 1 bitmap can be a muting bitmap for two periods with two bits, where each bit corresponds to one occasion corresponding to one period. In this case, muting can be performed for the corresponding occasion based on each bit. Furthermore, for example, the option 2 bitmap can correspond to each repetition of each DL PRS within one period.

[0257] When a UE is instructed to perform muting based on the option 1 bitmap, the UE recognizes that all DL PRSs of the corresponding occasion are muted, and can perform location. On the other hand, in the case of the option 2 bitmap, among occasions for which muting is not instructed to the UE based on the option 1 bitmap, the DL PRSs instructed to be muted through the option 2 bitmap can be muted. That is, the UE can perform location only for DL ​​PRS resources instructed not to be muted in both the option 1 bitmap and the option 2 bitmap. As a specific embodiment, each of the DL PRS occasions 1410-1, 1410-2, 1410-3, and 1410-4 in FIG. 20(b) can correspond to a respective PRS period. Here, the first DL PRS occasion 1410-1 can correspond to "period #0", the second DL PRS occasion 1410-2 can correspond to "period #1", the third DL PRS occasion 1410-3 can correspond to "period #2", and the fourth DL PRS occasion 1410-4 can correspond to "period #3".

[0258] Since each bit in the Option 1 Bitmap corresponds to a DL PRS occasion, the Option 1 Bitmap may be two bits. Here, of the two-bit Option 1 Bitmap corresponding to the first DL PRS occasion 1410-1 and the second DL PRS occasion 1410-2, if the bit corresponding to the first DL PRS occasion 1410-1 indicates muting, all DL PRS resources 1420-1 and 1420-2 in the first DL PRS occasion 1410-1 are muted. Also, if the bit corresponding to the second DL PRS occasion 1410-2 in the two-bit Option 1 Bitmap indicates muting, all DL PRS resources 1420-3 and 1420-4 in the second DL PRS occasion 1410-2 are muted.

[0259] On the other hand, if the bit corresponding to the third DL PRS occasion 1410-3 in the two-bit option 1 bitmap corresponding to the third DL PRS occasion 1410-3 and the fourth DL PRS occasion 1410-4 indicates muting, all of the DL PRS resources 1420-5 and 1420-6 in the third DL PRS occasion 1410-3 are muted. Also, if the bit corresponding to the fourth DL PRS occasion 1410-4 in the two-bit option 1 bitmap indicates muting, all of the DL PRS resources 1420-7 and 1420-8 in the fourth DL PRS occasion 1410-4 are muted.

[0260] Furthermore, repetitions of DL PRS resources can be included within each of the DL PRS occasions 1410-1, 1410-2, 1410-3, and 1410-4. For example, the first DL PRS occasion 1410-1 includes two repetitions of DL PRS resources 1420-1 and 1420-2. The second DL PRS occasion 1410-2 also includes two repetitions of DL PRS resources 1420-3 and 1420-4. The third DL PRS occasion 1410-3 also includes two repetitions of DL PRS resources 1420-5 and 1420-6. The fourth DL PRS occasion 1410-4 also includes two repetitions of DL PRS resources 1420-7 and 1420-8.

[0261] In this case, each bit in the option 2 bitmap corresponds to each DL PRS resource repetition, so in the first DL PRS occasion 1410-1, the option 2 bitmap is set to two bits, corresponding to two DL PRS resource repetitions 1420-1 and 1420-2.

[0262] Here, if the option 1 bitmap indicates that the first DL PRS occasion 1410-1 should be muted, then the two DL PRS resource repeats 1420-1 and 1420-2 are muted regardless of the option 2 bitmap. Conversely, if the option 1 bitmap indicates that the first DL PRS occasion 1410-1 should not be muted, then the two DL PRS resource repeats 1420-1 and 1420-2 are muted by the option 2 bitmap. Here, if the bit in the two-bit option 2 bitmap corresponding to the first DL PRS resource repeat 1420-1 indicates muting, then the DL PRS resource 1420-1 is muted. Furthermore, if the bit in the two-bit option 2 bitmap corresponding to the second DL PRS resource repeat 1420-2 indicates muting, then the DL PRS resource 1420-2 is muted. The option 2 bitmap can be applied when the option 1 bitmap indicates no muting.

[0263] Also, as an example, FIG. 21 is a diagram illustrating an NR sidelink slot structure to which the present disclosure can be applied.

[0264] Referring to FIG. 21, one sidelink slot (SL slot) includes one automatic gain control (AGC) symbol. One SL slot also includes one transmit-receive (Tx-Rx) switching symbol. In one SL slot, the PSSCH, which is a channel for transmitting data, is transmitted through one or more subchannels (e.g., two subchannels in the case of FIG. 21). In addition, in the time domain, the remaining Orthogonal Frequency Division Multiplexing (OFDM) symbols, excluding the AGC symbol and the Tx-Rx switching symbol, may transmit the PSCCH (1st SCI), the secondary SCI, the PSSCH (Data), and a Demodulation RS (DMRS) for demodulation. Specifically, the positions of the PSCCH (1st SCI), the secondary SCI, the PSSCH (Data), and the Demodulation RS (DMRS) for demodulation are as shown in FIG. 21, but are not limited thereto. For example, in Fig. 21, a PSCCH and a secondary SCI exist in the first subchannel, and the PSSCH and DMRS may be allocated taking this into consideration. As another example, in Fig. 21, a PSCCH and a secondary SCI do not exist in the second subchannel, and the PSSCH and DMRS may be allocated as shown in Fig. 21.

[0265] Here, the number of OFDMs for the PSSCH DMRS can be set to one or more depending on the channel environment of the terminal through higher layer configuration. The PSCCH (1st SCI) is decoded and received using the DMRS of the PSCCH (i.e., the PSCCH DMRS) and is transmitted by being evenly allocated to every four resource elements within one resource block (RB). On the other hand, the 2nd SCI is decoded using the PSSCH DMRS.

[0266] For example, one resource pool related to the NR sidelink can support all of frequency division multiplexing (FDM), time division multiplexing (TDM), and spatial division multiplexing (SDM). That is, each resource in one resource pool can be divided and used based on frequency, time, and space, thereby improving resource efficiency.

[0267] Also, the numerology and waveform for the sidelink may be considered, and may be as shown in Table 15 below. Specifically, with respect to the PSSCH / PSCCH and PSFCH in the sidelink, the SCS and CP lengths supported by each of FR1 and FR2 may be as shown in Table 15 below. Here, the waveform may not support DFT-S-OFDM and may support only OFDM, but is not limited thereto. A sidelink-synchronization signal block (SL-SSB) may be defined independently for each frequency range, which may be similar to NR-Uu.

[0268] [Table 15]

[0269] FIG. 22 is a diagram illustrating an NR sidelink resource pool configuration to which the present disclosure can be applied. Referring to FIG. 22, a resource pool may refer to time and frequency resources used for sidelink transmission and reception. As an example, at least one resource pool may be configured within one SL BWP within one carrier. Here, the resources of the resource pool may be configured based on time resources in units of slot sets and frequency resources in units of consecutive subchannel sets. Furthermore, the resource pool may be configured separately for transmission and reception.

[0270] More specifically, the time resource for resource pool configuration provided in the NR sidelink is the time period of the resource pool, a set of sidelink slots (sl-TimeResource(length=L bitmap)), the first symbol for a set of consecutive symbols within a slot and / or the number of consecutive symbols can be configured. The frequency resource can be set to at least one of the bandwidth of one subchannel (e.g., sl-SubchannelSize={10, 15, 20, 25, 50, 75, and 100} RBs), the total bandwidth of a resource pool indicated by the number of consecutive subchannels (a set of consecutive subchannels (e.g., sl-NumSubchannel={1 to 27}), and the frequency domain position of the first subchannel of the resource pool (sl-StartRBsubchannel={0 to 265}). For example, resources in the time domain and the frequency domain may be set based on higher layer parameters. In FIG. 22, the frequency resource corresponding to the excluded resource block (RB) may refer to some RBs remaining when the total usable RB resources do not exactly match the subchannel size (i.e., the number of RBs does not equal one subchannel). In this case, the resource may not be used in the NR sidelink. For example, reserved slots (reserved slots) may be set. The sl-slot) can refer to the remaining slots when the length of the bitmap on the time resource (e.g., sl-TimeResource) is not a multiple of the length, and does not need to be used as an NR sidelink resource.

[0271] Based on the above, the following describes a method for performing positioning based on sidelink PRS (SL PRS).

[0272] For example, at least one SL resource pool can be configured in one SL BWP in one carrier. Here, the resources of the SL resource pool can be configured based on time resources in units of slot sets and frequency resources in units of consecutive subchannel sets. Here, the time resource for configuring the SL resource pool is the SL resource pool time period, a set of sidelink slots (sl-TimeResource(length=L)) within one SL resource pool application period. bitmap )), and at least one of the first symbol and the number of consecutive symbols for consecutive symbol sets within one slot can be configured, as described above. Here, sidelink communication can be performed via the sidelink slot set and symbols within the slot set.

[0273] For example, the SL PRS is a set of sidelink slots within the SL resource pool application period (sl-TimeResource(length=L bitmap )) and the sidelink communication is allocated by taking into account the sidelink slot set (sl-TimeResource(length=L bitmap Since the SL PRS can only be executed in the available slots indicated by the sidelink slot set (sl-TimeResource(length=L bitmap )) can be allocated taking into account the sidelink slot set (sl-TimeResource(length=L bitmap )) may be set to any of 10 bits to 160 bits. bitmap If the sidelink slot set (sl-TimeResource(length=L)) is 10 bits, each bit indicates one slot, and the SL resource for 10 slots can be indicated. bitmapIf )) is 160 bits, then 160 slots can be indicated, one slot per bit.

[0274] Here, the SL PRS configuration may include an SL PRS transmission schedule and may be configured in the UE. Thus, the UE can identify the SL PRS based on the indicated SL PRS configuration without performing blind detection. The pneumology for the SL PRS may be the same as the pneumology for sidelink data transmission. For example, the CP length and subcarrier spacing (SCS) for the SL PRS may be the same as the CP length and SCS for sidelink data transmission.

[0275] As an example, an SL PRS resource set may be configured in one terminal for SL PRS allocation for sidelink positioning based on the SL PRS configuration. In this case, the SL PRS resource set may be a collection of SL PRS resources. Each SL PRS resource in the SL PRS resource set may have its own SL PRS PRS resource ID. Furthermore, an SL PRS periodicity may be configured for each SL PRS resource set, and all SL PRS allocations in the SL PRS resource set may have the same periodicity. Furthermore, as an example, multiple SL PRS resource sets may be configured in one terminal.

[0276] Here, the period P for SL PRS allocation may be expressed as Equation 11. More specifically, the period P for SL PRS allocation is determined by the sidelink slot set (sl-TimeResource(length=L)) as the time resource of the SL resource pool. bitmapThe sidelink communication can be determined by considering the set of sidelink slots for the SL resource pool (sl-TimeResource(length=L bitmap In the application of sl-TimeResource (length=L), the slots corresponding to the part corresponding to "1" can be used as sidelink resources, and SL PRS allocation can also be performed only in these resources. Considering the above, SL PRS allocation can also be performed in the sidelink slot set (sl-TimeResource (length=L) bitmap )) can be determined by taking into account the sidelink PRS allocation period P. Therefore, the SL PRS allocation period P can be configured as shown in Equation 11 below. Here, A can be an integer from 1 to M. The sidelink slot set (sl-TimeResource(length=L bitmap Since the maximum value of M can be 160 bits, M can be up to 128 (160*128=20480). However, since a slot can be 1 ms in a 15 kHz SCS, only 10240 slots can be supported. In a 15 kHz SCS, M can be up to 64 (160*64=10240). As another example, A can be 2 n A can be set to any value, i.e., 1, 2, 4, 8, 16, …, 2 n As mentioned above, the maximum value of A is 2 n = 128, but for 15 kHz SCS, the maximum value of A is 2 n = 64.

[0277] That is, the period P for SL PRS allocation is determined by the sidelink slot set L bitmap The decision can be made taking into consideration the following:

[0278]

number

[0279] Further, as an example, an SL PRS muting bitmap can be configured in an SL PRS resource set. Specifically, when a terminal receives an indication of an SL PRS to be muted, the terminal can mute the SL PRS. Here, an SL PRS muting bitmap can be configured for the SL PRS resource set, and the SL PRS to be muted can be indicated to the terminal based on this. In this case, each bit in the SL PRS muting bitmap (hereinafter referred to as Option 1 bitmap) can correspond to each occasion or consecutive instances in the SL PRS resource set. In this case, if a specific bit indicates muting, all SL PRSs in the occasion or consecutive instances corresponding to the specific bit can be muted.

[0280] Furthermore, a bitmap indicating muting (hereinafter referred to as "option 2 bitmap") can indicate muting for each SL PRS resource within an occasion or instance for one period. Each bit of the bitmap can correspond to a repetition index of each SL PRS resource within an occasion or instance for one period. That is, each bit can correspond to one repetition of the SL PRS within each SL PRS period, and each bit can indicate muting. As an example, the SL PRS resource can be repeated 1, 2, 4, 6, 8, 16, or 32 times. The interval between each repeated SL PRS resource can be set to any of 1, 2, 4, 8, 16, and 32 slots, but is not limited to the above embodiment. In relation to the muting option, at least one of an option 1 bitmap and an option 2 bitmap can be set. As an example, only the option 1 bitmap can be set. Furthermore, as a further example, only the option 2 bitmap can be set. Note that, as an example, both the option 1 bitmap and the option 2 bitmap can be set. In this case, if both the option 1 bitmap and the option 2 bitmap are set, all SL PRS resources in the occasions for which muting is instructed based on option 1 are muted, and among the occasions for which muting is not instructed by the option 1 bitmap, the SL PRS resources for which muting is instructed by the option 2 bitmap can be muted.

[0281] Here, the bitmap can be set to any of 2, 4, 8, 16, or 32 bits. As an example, the occasions or consecutive instances of the PRS described above may correspond to any of the P periods in Equation 11 described above.

[0282] Here, when the P value is determined as in Equation 11, the P period does not have to be repeated in units of bitmap units (2 / 4 / 8 / 16 / 32) throughout the entire interval, and there may be intervals not indicated by the bitmap. As a specific example, a case can be considered in which 4480 slots out of 20480 slots are 1) not uplink slots, 2) SSB slots, or 3) the remaining slots excluding slots excluded from the SL resources as reserved slots are 16000. According to Equation 11, P = A L bitmap If P = 100 slots is applied, there can be 160 occasions based on 16,000 slots out of 20,480 slots. Here, SL PRS muting can be indicated based on repeated application of bitmap units (2 / 4 / 8 / 16 / 32), and since the P period and bit tap unit are divisible numbers, there may be no indication problem. However, as another example, if 3,480 slots out of 20,480 slots are 1) not uplink slots, 2) SSB slots, and 3) excluded as reserved slots, resource allocation to the remaining 17,000 slots can be considered. Based on Equation 11, P = A L bitmapIf ≠ 100 slots are applied, there can be 170 occasions based on 17,000 slots out of 20,480 slots. In this case, there is a risk that the remaining units (4 / 8 / 16 / 32) excluding 2 of the bitmap units indicating each occasion do not match the P period. Considering the above, the following Equation 12 can be used to apply the bitmap for Option 1. In Equation 12, B can be the number of occasions. Also, k can be the bitmap unit, and int(B / k) times can be the number of times the bitmap is repeatedly applied. int(x) can represent the integer value of x. Then, the bitmap is repeatedly transmitted as is, and for the remaining occasions, the bit corresponding to the least significant bit (LSB) in the bitmap can be sequentially applied to Bk·int(B / k). As described above, it is possible to indicate the muted resource even if the P period and the bitmap unit are not divisible.

[0283] As a specific example, as mentioned above, if 17,000 slots out of 20,480 slots are used as resources, B is 17,000 / (A·L bitmap = 100) = 170. That is, the occasion can be 170. Here, if the bitmap unit is 16 (k = 16), the bitmap can be repeated 10 (int(170 / 16)) times. That is, the 16-length bitmap can be applied repeatedly 10 times. Then, the 10 LSB bits of the 16-length bitmap can be applied to the remaining 10 occasions to instruct muting. Furthermore, as an example, in the case of a 15 kHz SCS in Equation 12 below, 10240 can be applied instead of 20480, as described above.

[0284]

number

[0285] As another example, in one occasion having a period P, the SL PRS may be repeatedly allocated and transmitted in 1, 2, 4, 8, 16, and 32 slots. Here, the interval between the repeatedly allocated and transmitted SL PRS slots may be 1, 2, 4, 8, 16, or 32 slots, as described above. Here, when the period P is determined based on Equation 11, the SL PRS may be repeatedly allocated and transmitted in 1, 2, 4, 8, 16, and 32 slots in one occasion. However, the SL PRS transmission is not repeated in one occasion based on the period P. bitmap can be A repeated applications of L bitmap The bit value in L may be limited to slots corresponding to "1". bitmap The SL PRS can be transmitted in a recursive allocation of slots available as SL resources based on the period P. Furthermore, the interval between slots transmitted in the recursive allocation of SL PRS can be 1, 2, 4, 8, 16, or 32 slots. Here, as an example, the L bitmap can be applied A times, and L bitmap Since SL PRS transmission is possible only in slots corresponding to a bit value of "1" in L, SL PRS repetition allocation can be performed based on slots corresponding to a bit value of "1". bitmap The above-mentioned SL PRS repetitive allocation can be applied to transmission only for slots that can be used as SL resources based on the above. In addition, the interval between slots transmitted in the SL PRS repetitive allocation can also be adjusted based on the above-mentioned bitmap In the A-time application of the bit value "1", the interval between the slots (i.e., the logically designated slots) can be designated by separately grouping the slots whose bit value corresponds to "1".

[0286] As another example, when the SL PRS is repeatedly transmitted in one occasion based on 2, 4, 8, 16, or 32 bits in relation to the Option 2 muting bitmap as the SL PRS-related muting bitmap described above, the Option 2 muting bitmap may be set to a bitmap of 2, 4, 8, 16, or 32 bits. Again, the Option 2 muting bitmap may be applied based on a slot grouping (i.e., a logically indicated slot) of slots corresponding to a bit value of "1," and is not limited to a specific embodiment.

[0287] Further, as an example, the UE may select a specific resource from the remaining resources belonging to the SL resource pool, excluding resources occupied and in use by other UEs. Here, as an example, as described above, time-frequency resources corresponding to the SL PRS transmission slot may also be excluded in the sensing step. That is, when the UE excludes resources occupied and in use by other UEs from the resources belonging to the SL resource pool, the UE may also exclude time-frequency resources corresponding to the SL PRS transmission slot in the sensing step. As an example, Table 16 below may be an operation in which the UE senses resources for sidelink communication, excludes resources that cannot be used, and selects resources, but is not limited thereto. Referring to Table 16, Rx and y are single-subframe resource candidates, and SA may represent a set of all possible single-subframe resource candidates. Here, the UE may exclude resources occupied by other UEs based on sensing as described above, which may be as described in "5)" below. For example, the UE may exclude resources on which it performs transmission in the sensing process. In addition, the UE may exclude resources reserved based on higher layer configuration or SCI in the sensing process. Here, as an example, the UE may also exclude time-frequency resources corresponding to the above-mentioned SL PRS transmission slots during the sensing process. That is, the UE may consider the SL PRS transmission slots during the process of selecting sidelink resources based on an operation of sensing resources for sidelink communication and excluding unavailable resources.

[0288] [Table 16-1]

[0289] [Table 16-2]

[0290] [Table 16-3]

[0291] FIG. 23 is a flowchart showing a method for determining an SL PRS allocation period based on a sidelink slot set bitmap of a sidelink resource pool to which the present disclosure may be applied. Referring to FIG. 23, a terminal may acquire SL resource pool configuration information (S2310). Here, the resources of the SL resource pool may be configured based on time resources in units of slot sets and frequency resources in units of consecutive subchannel sets. The time resources for configuring the SL resource pool include the SL resource pool time period, the sidelink slot set (sl-TimeResource(length=L)) within one SL resource pool application period, and the SL resource pool time period. bitmap )), and at least one of the first symbol for a set of consecutive symbols within one slot and the number of consecutive symbols may be configured, as described above. Also, for example, the UE may acquire SL PRS configuration information (S2320) and perform SL PRS transmission based on the SL PRS allocation (S2330). Here, the SL PRS configuration may include an SL PRS transmission schedule and may be configured in the UE. Thus, the UE can identify the SL PRS based on the indicated SL PRS configuration without performing blind detection. The pneumology of the SL PRS may be the same as that for sidelink data transmission. For example, the CP length and subcarrier spacing (SCS) for the SL PRS may be the same as those for sidelink data transmission.

[0292] As an example, an SL PRS resource set may be configured in one terminal for SL PRS allocation for sidelink positioning based on the SL PRS configuration. In this case, the SL PRS resource set may be a collection of SL PRS resources. Each SL PRS resource in the SL PRS resource set may have its own SL PRS PRS resource ID. Furthermore, an SL PRS periodicity may be configured for each SL PRS resource set, and all SL PRS allocations in the SL PRS resource set may have the same periodicity. Furthermore, as an example, multiple SL PRS resource sets may be configured in one terminal.

[0293] Here, the SL PRS allocation is performed based on the SL resource pool configuration information. bitmap )) and the sidelink communication is allocated by taking into account the sidelink slot set (sl-TimeResource(length=L bitmap Since the SL PRS can only be executed in the available slots indicated by the sidelink slot set (sl-TimeResource(length=L bitmap )) based on the SL resource pool configuration information. bitmap )), the SL PRS allocation period can be determined by obtaining only the information about the A value described above, but is not limited to this.

[0294] 24 is a diagram illustrating full-sensing-based resource selection and resource pool configuration to which the present disclosure can be applied. proc、0) range, where the square brackets "[" mean that the closed interval includes n-T0, and the parentheses ")" mean that nT proc、0 This means that T0 and nT proc、0 can be as shown in Table 17 below. As an example, as mentioned above, a = T0 = 1000 2 u (slots) and b=T proc、0 If =1, the terminal is 1000·2 u A terminal can perform sensing in a sensing window corresponding to a slot. This allows the terminal to check resources that are occupied and in use by other terminals. The terminal can select a specific resource from the remaining resources belonging to the resource pool, excluding resources that are occupied and in use by other terminals.

[0295] [Table 17]

[0296] For example, referring to FIG. 23(b), the terminal may select TTI n+c, TTI n+e, TTI n+c', and TTI n+e' and transmit the control channel and data channel on the selected resources. Here, TTI n+c and TTI n+c' are P reserve *j TTIs. As an example, if one TTI indicates one slot to which the bitmap is applied, the TTI is P reserve *j slots. Furthermore, TTI n+e and TTI n+e' can also be P reserve *j TTIs (or P*j slots). reserve may refer to a resource reservation interval.

[0297] As a specific example, Preserve The value can be determined by upper end signaling. reserve The value can be any of the values ​​corresponding to 0, 1, 2, ..., 99, 100, 200, 300, ..., 1000 ms. reserve The value is P rsvp_TX It can be displayed on the receiving device. reserve The value is P rsvp_RX At this time, P rsvp_TX and P rsvp_RX can be a value in ms. rsvp_TX and P rsvp_RX Converting this to a logical value in slot units gives P' rsvp_TX and P' rsvp_RX It can be displayed as:

[0298] In this case, j may be any value selected in the range of [0, 1, ..., 10] by network configuration or pre-configuration for each carrier (or band) used for V2X. Here, j may be selected and indicated through a 'Resource reservation' signaling field of the SCI included in the SA, but is not limited to the above-mentioned embodiment. In this case, j = 0 may mean that the c' value does not exist. In other words, it may mean that no resources are reserved after the TTIs corresponding to 'TTI n+c' to 'P*j' for the transmission of TB#2 (second TB).

[0299] Here, referring to FIG. 23(a), when full sensing is performed, the 'TTI n+c' period can be selected by sensing from the resource pool belonging to [TTI n+T1, TTI n+T2].

[0300] At this time, n≦n+T1≦n+ Tproc、1 Also, n+T 2、min≦n+T2≦n+(remaining packet delay budget), i.e., T1≦T proc、1 , T 2、min The T1 and T2 values ​​can be determined such that ≦T2≦(remaining packet delay budget).

[0301] As an example, when u=0 (i.e., when the SCS is 15Khz), T proc、1= On the other hand, when u=1, 2, and 3 (i.e., when the SCS is 30 Khz, 60 Khz, and 120 Khz, respectively), T proc、1 may be fixed to values ​​corresponding to 5, 9, and 17 slots, respectively. 2、min is 5·2 u , 10·2 u or 20·2 u The slots may be (pre)-configured with the corresponding values.

[0302] Here, as an example, P reserve may be selected as sl-ResourceReservePeriodList as any one of values ​​0, 1, 2, ..., 99, 100, 200, 300, ..., 1000 ms. As another example, the terminal may configure periodicSensingOccasionResevePeriodList based on higher layer signaling and select P from periodicSensingOccasionResevePeriodList. reserve Here, up to 16 periodicSensingOccasionResevePeriodList can be selected as a subset of sl-ResourceReservePeriodList.

[0303] As a specific example, the SL PBPS CPS config can be configured in the UE based on higher layer parameters. Here, a subset of sl-ResourceReservePeriodList for determining periodic sensing occasions can be indicated based on the sl-PBPS-OccasionReservePeriodiList parameter of the SL PBPS CPS config, and any of the periodicity values ​​in the subset can be used. As an example, if the sl-PBPS-OccasionReservePeriodiList is not configured, the UE can use any of the periodicity values ​​in sl-ResourceReservePeriodList.

[0304] Here, as an example, P reserve In consideration of the above, the period P for allocating SL PRSs can be determined as shown in Equation 13 below. Specifically, referring to FIG. 24, the period P for allocating SL PRSs can be determined in consideration of the reserved resources for sidelink communication. Here, A can be an integer from 1 to M (e.g., 128, 256). As another example, A can be an integer from 2 to M (e.g., 128, 256). n That is, A can be set to 1, 2, 4, 8, 16, ..., 2 n For example, A can be set to 2 n = 128, 256, but is not limited to a particular embodiment.

[0305]

number

[0306] Here, when the P value is determined as in the above-mentioned Equation 13, the P period does not have to be repeated in the muting bitmap unit (2 / 4 / 8 / 16 / 32) for all sections, and there may be sections that are not indicated by the muting bitmap. In consideration of the above, the following Equation 14 can be considered to apply the bitmap for Option 1. In Equation 14, C may be the number of occasions. Here, an occasion may correspond to one P period. Also, k may be the bitmap unit. For example, k*A*P reserve The k bitmap can be repeated until the length does not exceed 20480ms. Then, the last time, only the bit values ​​from the length k bitmap up to just before 20480ms can be applied, and they can be applied in bit order corresponding to the LSB.

[0307] Here, based on Equation 14, the number of occasions may be C. The bitmap may be repeatedly applied int(C / k) times. int(x) may represent an integer value of x. Then, the bitmap may be repeatedly transmitted as is, and for the remaining occasions, the bits corresponding to the least significant bit (LSB) from the bitmap may be sequentially applied to Ck·int(C / k). As described above, even if the P period and the bitmap unit are not divisible, the muted resource may be indicated.

[0308]

number

[0309] FIG. 25 shows the P applicable to this disclosure. reserve FIG. 10 illustrates a method for performing repeated transmission based on a period.

[0310] As an example, referring to FIG. 25, P=A*P based on Equation 13. reserve N in one occasion with max Based on the value P reserveOne, two, or three SL PRS repeat transmissions can be performed in N max If is 1, P in one occasion reserve Only one SL PRS transmission can be performed in N max If is 2, P in one occasion reserve Two SL PRS transmissions can be performed with N max If N is 3, three SL PRS transmissions can be performed with P_reserve in one occasion. As an example, the "Time gap between initial transmission and retransmission" field, which indicates the time interval between the initial transmission and the retransmission, can be set to N. max If is 2, it is set to 5 bits, and N max If N is 3, it may be set to 9 bits. Also, as an example, the 'Retransmission index' field indicating whether or not retransmission is possible may be set to N max is set to 1 bit if is 2, and N max If is 3, it may be set to 2 bits.

[0311] Specifically, referring to FIG. 25, N max When Gap1, the time interval between initial transmission and retransmission, is 0 (assuming that Gap1 is 2), the value of the 5-bit "Time gap between initial transmission and retransmission" field may be set to "00000". When Gap1, the time interval, is 1, 2, 3, ..., 31, the field values ​​may be "00001", "00010", "00011", ..., "11111", respectively. Here, a first value (e.g., 0) of the 1-bit "Retransmission index" field indicates the initial transmission of the SL PRS, and a second value (e.g., 1) indicates the retransmission of the SL PRS.

[0312] N maxConsider the case where the time interval between the initial transmission and the second transmission is Gap1, and the time interval between the second transmission and the third transmission is Gap2 when it is 3. Here, when both Gap1 and Gap2 are 0, the 9-bit "Time gap between initial transmission and retransmission" field value may be set to "000000000". When the time interval Gap1 is 1, 2, 3, …, 31 and Gap2 = 0, the above field values can be "000000001", "000000010", …, "000011111" respectively.

[0313] As another example, when Gap1 < Gap2 is set and Gap1 and Gap2 are selected from any two of {1, 2, …, 31}, based on 456 cases, the above field may be set to "000100000", "000100001", …, "1111100". Also, when the 2-bit "Retransmission index" field is "00", it indicates the first transmission of SL PRS, when it is "01", it indicates the second transmission of SL PRS, and when it is "10", it can indicate the third transmission of SL PRS.

[0314] Here, as an example, based on the period P, P can be repeatedly applied A times in one occasion, reserve and within P, reserve repeated transmission can be executed based on N. max Therefore, within one occasion, SL PRS can be repeatedly transmitted in a maximum of N reserve slots per P, max and the interval between the SL PRS slots repeatedly assigned and transmitted can be determined based on the "Time gap between initial transmission and retransmission" field value. Based on the above, the SL PRS repetition in one occasion can be composed of 1, 2, or 3 times, and is not limited to a specific embodiment.

[0315] As another example, the SL PRS-related muting bitmap mentioned above may be used in conjunction with the Option 2 muting bitmap to allow P reserve Maximum N hits max The SL PRS can be repeatedly transmitted in N slots. max You can set the option 2 muting bitmap corresponding to N. max If is 1, the option 2 muting bitmap can be set once, and N max If is 2, the option 2 muting bitmap can be set once or twice, and N max is 3, the option 2 muting bitmap can be set to 1, 2 or 3 times. Therefore, the length of the corresponding bitmap can be 2 or 3, but is not limited to this.

[0316] Furthermore, as an example, the terminal may select a specific resource from the remaining resources belonging to the SL resource pool, excluding resources that are occupied and in use by other terminals. reserve SL PRS resources based on may be post-sensing resources and therefore may not be eliminated in the sensing step.

[0317] 26 is a flowchart showing a method for determining an SL PRS allocation period based on SL resources selected through SL resource sensing in a sidelink resource pool to which the present disclosure may be applied. Referring to FIG. 26, a terminal may perform SL resource sensing in the SL resource pool to eliminate unavailable resources and perform an SL resource selection operation, which may be as shown in FIG. 24 (S2610). Here, the selected resources are P reserveThe SL PRS configuration may be repeated based on the SL PRS assignment. As an example, the UE may acquire SL PRS configuration information (S2620) and perform SL PRS transmission based on the SL PRS assignment (S2630). Here, the SL PRS configuration may include an SL PRS transmission schedule and may be configured in the UE. Thus, the UE can identify the SL PRS based on the indicated SL PRS configuration without performing blind detection. The pneumology for the SL PRS may be the same as the pneumology for the sidelink data transmission. As an example, the CP length and subcarrier spacing (SCS) for the SL PRS may be the same as the CP length and SCS for the sidelink data transmission.

[0318] As an example, an SL PRS resource set may be configured in one terminal for SL PRS allocation for sidelink positioning based on the SL PRS configuration. In this case, the SL PRS resource set may be a collection of SL PRS resources. Each SL PRS resource in the SL PRS resource set may have its own SL PRS PRS resource ID. Furthermore, an SL PRS periodicity may be configured for each SL PRS resource set, and all SL PRS allocations in the SL PRS resource set may have the same periodicity. Furthermore, as an example, multiple SL PRS resource sets may be configured in one terminal.

[0319] Here, the SL PRS allocation is the period P of the SL resource selected according to the SL resource sensing in the SL resource pool. reserve That is, P reservemay be the period of the SL resources selected for SL transmission, and the SL PRS may also be transmitted on these resources. Therefore, the SL PRS allocation period is also P reserve This can be determined based on the above.

[0320] As another example, SL PRS resources may be configured on an SSB basis. For example, the UE may acquire SSB configuration information through higher layer signaling. For example, the SSB period may be set to 5, 10, 20, 40, 80, or 160 ms based on the SSB configuration information, but is not limited thereto. For example, the maximum number of SSBs available in the 3 GHz to 6 GHz band may be 8, and the maximum number of SSBs available above 6 GHz may be 64. For example, the maximum 64 SSBs may be transmitted based on 8-bit indicator information (e.g., groupPresence) indicating the presence or absence of 8 groups and 8-bit indicator information (e.g., inOneGroup) indicating the presence or absence of 8 SSB transmissions within a group. That is, the UE can receive SSBs based on the information configured through higher layer signaling. As a specific example, when the 8-bit indicator (e.g., groupPresence) is (1000000001) and is set to the 8-bit indicator (e.g., inOneGroup), the indices of the SSBs actually transmitted out of a maximum of 64 SSBs may be 0, 1, 56, and 57. Here, an SSB burst set is configured within 5 ms and can be repeatedly transmitted based on the aforementioned period.

[0321] In this case, for example, the period P for SL PRS allocation can be determined based on the following Equation 15. That is, the period is SSB priodicity Here, A can be an integer between 1 and M. Since the maximum value of the SSB period is 160 ms, M can be up to 128. As another example, A can be 2 n That is, A can be set to 1, 2, 4, 8, 16, ..., 2 nAs mentioned above, the maximum value of A is 2 n = 128. That is, the period P for SL PRS allocation can be set to the SSB period value. priodicity The SL PRS may be determined taking into consideration the above. As a more specific example, the SL PRS may be set based on the SSB periodicity value and transmitted in resources where SSBs are not transmitted. As another example, the SL PRS may be transmitted in a group where no SSB transmission group exists based on 8-bit indication information (e.g., groupPresence) indicating the presence or absence of 8 SSB transmission groups. Here, the 8-bit separate indication information indicating the presence or absence of an SL PRS transmission group for SL PRS allocation and the 8-bit separate indication information indicating the presence or absence of transmission of 8 SL PRSs in the group may be configured in the UE through higher layer signaling, but this is not limited to this embodiment.

[0322] More specifically, a PRS occasion or consecutive instances may correspond to any one of the P periods in Equation 15 below. The SL PRS can be repeated in one occasion, and since there are a maximum of 64 SSBs in one SSB period, there can be a maximum of A≠64 SSBs in one occasion. Of the 64 SSBs, the remaining slots, excluding those to which SSBs are actually assigned (i.e., slots corresponding to both the groupPresence bitmap and the inOneGroup bitmap with a bit value of '1'), can be used for SL PRS transmission. Therefore, it is necessary to indicate the presence or absence of SL PRS transmission for the remaining slots. For this purpose, an 8-bit separate indicator can be configured to indicate the presence or absence of an SL PRS transmission group corresponding to groupPresence, which indicates the presence or absence of SL PRS transmission. Furthermore, an 8-bit separate indicator can be configured to indicate the presence or absence of eight SL PRS transmissions in the group, which corresponds to inOneGroup. Here, the above-mentioned bitmap can indicate '1' or '0' only for the remaining bits excluding the slots where SSBs are transmitted (i.e., slots where the bit values ​​are '1' in both the groupPresence bitmap and the inOneGroup bitmap). For example, if both the bit values ​​are '1' in the groupPresence bitmap and the inOneGroup bitmap based on SSB transmission, the bit value of the bitmap for the SL PRS can always be 0.

[0323]

number

[0324] Further, as an example, an SL PRS muting bitmap can be configured in an SL PRS resource set. Specifically, when a terminal receives an indication of an SL PRS to be muted, the terminal can mute the SL PRS. Here, an SL PRS muting bitmap can be configured for the SL PRS resource set, and the SL PRS to be muted can be indicated to the terminal based on the SL PRS muting bitmap. In this case, the SL PRS muting bitmap can take into account the above-mentioned Option 1 bitmap and Option 2 bitmap. Specifically, each bit in the Option 1 bitmap can correspond to each occasion or consecutive instances in the SL PRS resource set. In this case, if a specific bit indicates muting, all SL PRSs in the occasion or consecutive instances corresponding to the specific bit can be muted.

[0325] In addition, the option 2 bitmap can indicate muting for each SL PRS resource within an occasion or instance for one period. Each bit of the bitmap can correspond to a repetition index of each SL PRS resource within an occasion or instance for one period. That is, each bit can correspond to one repetition of the SL PRS within each SL PRS period, and each bit can indicate muting. Here, the bitmap can be set to any of 2, 4, 8, 16, or 32 bits. As an example, the occasion or consecutive instances of the PRS described above can correspond to any of the P periods in Equation 15 above. When the P value is determined as in Equation 15 above, the P period is the SSB priodicity Therefore, it can be repeated in units of 2, 4, 8, 16 or 32 bitmap units.

[0326] As another example, SL PRS transmissions are transmitted in one occasion with period P. priodicity There can be A SL PRS-related muting bitmaps. Here, the option 2 muting bitmap can determine whether to mute A by bitmap. That is, the muting unit of the option 2 muting bitmap can be an SSB period unit, and muting can be instructed based on this.

[0327] FIG. 27 is a flowchart showing a method for determining an SL PRS allocation period based on an SSB to which the present disclosure can be applied. Referring to FIG. 27, a terminal may acquire SSB configuration information (S2710). Here, the SSB period may be set to 5, 10, 20, 40, 80, or 160 ms based on the SSB configuration information, but is not limited thereto. For example, the maximum number of SSBs available in the 3 GHz to 6 GHz band may be 8, and the maximum number of SSBs available in the 6 GHz band or higher may be 64. For example, the maximum 64 SSBs may be transmitted based on 8-bit indication information (e.g., groupPresence) indicating the presence or absence of 8 groups and 8-bit indication information (e.g., inOneGroup) indicating the presence or absence of 8 SSB transmissions within a group. That is, the terminal can receive SSBs based on the information configured through higher layer signaling. Here, for example, the period P for SL PRS allocation may be determined based on the above-described Equation 15. That is, the period is determined based on the SSBs priodicityFor example, the UE may acquire SL PRS configuration information (S2720) and perform SL PRS transmission based on the SL PRS allocation (S2730). Here, the SL PRS configuration may include an SL PRS transmission schedule and may be configured in the UE. Thus, the UE can identify the SL PRS based on the indicated SL PRS configuration without performing blind detection. The pneumology of the SL PRS may be the same as the pneumology for sidelink data transmission. For example, the CP length and subcarrier spacing (SCS) for the SL PRS may be the same as the CP length and SCS for the sidelink data transmission.

[0328] As an example, an SL PRS resource set may be configured in one terminal for SL PRS allocation for sidelink positioning based on the SL PRS configuration. In this case, the SL PRS resource set may be a collection of SL PRS resources. Each SL PRS resource in the SL PRS resource set may have its own SL PRS PRS resource ID. Furthermore, an SL PRS periodicity may be configured for each SL PRS resource set, and all SL PRS allocations in the SL PRS resource set may have the same periodicity. Furthermore, as an example, multiple SL PRS resource sets may be configured in one terminal.

[0329] Here, SL PRS allocation is performed based on the SSB configuration information. priodicity As an example, SSB priodicity is the SSB transmission period, and SL PRS is the SSB priodicitySSBs may be transmitted over unallocated resources, as described above.

[0330] FIG. 28 is a diagram showing a base station apparatus and a terminal apparatus to which the present disclosure can be applied.

[0331] The base station device 2800 may include a processor 2820 , an antenna unit 2812 , a transceiver 2814 , and a memory 2816 .

[0332] The processor 2820 performs baseband-related signal processing and may include an upper layer processing unit 2828 and a physical layer processing unit 2840. The upper layer processing unit 2828 may process operations of a medium access control (MAC) layer, a radio resource control (RRC) layer, or higher layers. The physical layer processing unit 2840 may process operations of a physical (PHY) layer (e.g., uplink receive signal processing, downlink transmit signal processing). In addition to performing baseband-related signal processing, the processor 2820 may also control the overall operation of the base station apparatus 2800.

[0333] The antenna unit 2812 may include one or more physical antennas, and when multiple antennas are included, it may support MIMO (Multiple Input Multiple Output) transmission and reception. The transceiver 2814 may include a radio frequency (RF) transmitter and an RF receiver. The memory 2816 may store information processed by the processor 2820, software related to the operation of the base station device 2800, an operating system, applications, etc., and may include components such as buffers.

[0334] The processor 2820 of the base station 2800 may be configured to implement the operation of the base station in the embodiments described herein.

[0335] The terminal device 2850 may include a processor 2870, an antenna unit 2862, a transceiver 2864, and a memory 2866. As an example, in the present invention, the terminal device 2850 can communicate with the base station device 2800. As another example, in the present invention, the terminal device 2850 can perform sidelink communication with another terminal device. That is, the terminal device 2850 of the present invention refers to a device that can communicate with at least one of the base station device 2800 and another terminal device, and is not limited to communication with a specific device.

[0336] The processor 2870 performs baseband-related signal processing and may include an upper layer processing unit 2880 and a physical layer processing unit 2890. The upper layer processing unit 2880 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 2890 may process operations of the PHY layer (e.g., downlink receive signal processing, uplink transmit signal processing). In addition to performing baseband-related signal processing, the processor 2870 may also control the overall operation of the terminal device 2850.

[0337] The antenna unit 2862 may include one or more physical antennas, and when multiple antennas are included, MIMO transmission and reception may be supported. The transceiver 2864 may include an RF transmitter and an RF receiver. The memory 2866 may store information processed by the processor 2870, software related to the operation of the terminal device 2850, an operating system, applications, etc., and may include components such as a buffer. As an example, the operations of FIGS. 1 to 19 described above may be performed based on the base station 2800 and the terminal device 2850, and this is not limited to a specific embodiment.

[0338] The various embodiments of the present disclosure do not enumerate all possible combinations, but are intended to describe representative aspects of the present disclosure, and the matters described in the various embodiments may be applied independently or in combination of two or more.

[0339] Furthermore, various embodiments of the present disclosure may be implemented in hardware, firmware, software, or a combination thereof, etc. In the case of a hardware implementation, the implementation may be implemented using one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, etc.

[0340] The scope of the present disclosure includes software or machine-executable instructions (e.g., operating systems, applications, firmware, programs, etc.) that cause the operations of the methods of the various embodiments to be performed on a device or computer, as well as non-transitory computer-readable media on which such software or instructions are stored and which can be executed on a device or computer. [Industrial Applicability]

[0341] The following may also be applicable to other systems.

Claims

1. 1. A method for performing sidelink positioning in a wireless communication system, comprising: Obtaining sidelink (SL) resource pool configuration information; Obtaining sidelink positioning reference signal (SL PRS) configuration information; and A method for performing positioning, comprising transmitting an SL PRS based on an SL PRS allocation.

2. 1. A method for performing sidelink positioning in a wireless communication system, comprising: selecting a sidelink (SL) resource based on SL resource sensing in a sidelink (SL) resource pool; Obtaining sidelink positioning reference signal (SL PRS) configuration information; and A method for performing positioning, comprising transmitting an SL PRS based on an SL PRS allocation.

3. 1. A method for performing sidelink positioning in a wireless communication system, comprising: obtaining synchronization signal block (SSB) configuration information; Obtaining sidelink positioning reference signal (SL PRS) configuration information; and A method for performing positioning, comprising transmitting an SL PRS based on an SL PRS allocation.

Images