Method and apparatus for requesting sidelink positioning reference signal resources

Abstract

Disclosed are devices, methods, and systems for requesting sidelink positioning reference signal resources. One method (600) includes transmitting (602) a request for at least one resource for a sidelink positioning reference signal. The method (600) includes receiving (604) a response to the request for the at least one resource for the sidelink positioning reference signal. The method (600) includes transmitting (606) a sidelink positioning reference signal in the at least one resource. The method (600) includes transmitting (608) a report containing estimated positioning information.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Patent Application No. 63 / 032,286, filed May 29, 2020, entitled “Apparatus, Methods, and Systems for SL PRS Allocation Procedure”, and U.S. Patent Application No. 63 / 032,225, filed May 29, 2020, entitled “Apparatus, Methods, and Systems for SL PRS Resource Pool Configuration”, both of which are incorporated herein by reference in their entirety. Technical Field

[0003] The topics disclosed in this article generally relate to wireless communication, and more specifically, to request-side walkway location reference signal resources. Background Technology

[0004] In some wireless communication networks, lateral link positioning reference signals can be transmitted. These signals can be used to estimate positioning information. Summary of the Invention

[0005] A method for requesting lateral link positioning reference signal resources is disclosed. Apparatus and systems also perform the functions of the method. One embodiment of the method includes transmitting a request for at least one resource for lateral link positioning reference signals. In some embodiments, the method includes receiving a response to the request for the at least one resource for the lateral link positioning reference signals. In some embodiments, the method includes transmitting the lateral link positioning reference signals in the at least one resource. In various embodiments, the method includes transmitting a report containing estimated positioning information.

[0006] An apparatus for requesting lateral link positioning reference signal resources includes a transmitter that transmits a request for at least one resource for the lateral link positioning reference signal. In various embodiments, the apparatus includes a receiver that receives a response to the request for the at least one resource for the lateral link positioning reference signal. The transmitter transmits the lateral link positioning reference signal in the at least one resource and also transmits a report containing estimated positioning information. Attached Figure Description

[0007] A more specific description of the embodiments briefly described above will be presented with reference to the specific embodiments illustrated in the accompanying drawings. It should be understood that these drawings depict only a few embodiments and therefore should not be considered as limiting the scope. The embodiments will be described and explained with additional specificity and detail using the accompanying drawings, in which:

[0008] Figure 1 This is a schematic block diagram illustrating an embodiment of a wireless communication system for requesting side-link location reference signal resources;

[0009] Figure 2 This is a schematic block diagram illustrating one embodiment of a device that can be used to request side-link location reference signal resources;

[0010] Figure 3 This is a schematic block diagram illustrating one embodiment of a device that can be used to indicate side-link positioning reference signal resources;

[0011] Figure 4 This is a network communication diagram illustrating one embodiment of on-demand side link positioning reference signal resource transmission;

[0012] Figure 5 This is a schematic block diagram illustrating one embodiment of the sidelink configuration information model; and

[0013] Figure 6 This is a flowchart illustrating one embodiment of a method for requesting reference signal resources on a side-linked walkway. Detailed Implementation

[0014] As those skilled in the art will understand, aspects of the embodiments may be embodied as a system, device, method, or program product. Therefore, embodiments may take the form of a completely hardware embodiment, a completely software embodiment (including firmware, resident software, microcode, etc.), or an embodiment combining software and hardware aspects (collectively referred to herein as a "circuit," "module," or "system"). Furthermore, embodiments may take the form of a program product embodied in one or more computer-readable storage devices that store machine-readable code, computer-readable code, and / or program code, hereinafter referred to as code. The storage device may be tangible, non-transitory, and / or non-transferable. The storage device may not embody signals. In one embodiment, the storage device employs only signals for accessing code.

[0015] Some of the functional units described in this specification may be designated as modules to more specifically emphasize their implementation independence. For example, a module may be implemented as hardware circuitry including custom very large-scale integration (“VLSI”) circuitry or gate arrays, such as logic chips, off-the-shelf semiconductors of transistors, or other discrete components. Modules may also be implemented in programmable hardware devices, such as field-programmable gate arrays, programmable array logic, programmable logic devices, etc.

[0016] Modules can also be implemented in code and / or software for execution by various types of processors. An identified module of code may, for example, contain one or more physical or logical blocks of executable code, which may be organized, for example, as objects, programs, or functions. However, the executable files of the identified modules do not necessarily reside physically together, but may contain different instructions stored in different locations that, when logically combined, encompass the module and implement its stated purpose.

[0017] In practice, a module of code can be a single instruction, or many instructions, and can even be distributed across several different code segments in different programs, spanning several memory devices. Similarly, operational data can be identified and described within this module, and can be represented in any suitable form and organized within any suitable type of data structure. Operational data can be collected as a single dataset or distributed across different locations, including various computer-readable storage devices. Where a module or part of a module is implemented in software, the software portion is stored on one or more computer-readable storage devices.

[0018] Any combination of one or more computer-readable media may be used. The computer-readable media may be a computer-readable storage medium. The computer-readable storage medium may be a storage device for storing code. The storage device may be, for example, but not limited to, electronic, magnetic, optical, electromagnetic, infrared, holographic, micromechanical, or semiconductor systems, devices, or apparatuses, or any suitable combination thereof.

[0019] More specific examples of storage devices (a non-exhaustive list) will include the following: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (“RAM”), read-only memory (“ROM”), erasable programmable read-only memory (“EPROM” or flash memory), portable optical disc read-only memory (“CD-ROM”), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing. In the context of this document, computer-readable storage media can be any tangible medium that contains or stores programs for use by or in conjunction with an instruction execution system, device, or apparatus.

[0020] The code used to implement the operations of the embodiments can be any number of lines and can be written in any combination of one or more programming languages, including object-oriented programming languages ​​(such as Python, Ruby, Java, Smalltalk, C++, etc.) and general programming languages ​​(such as the "C" programming language, etc.) and / or machine languages ​​(such as assembly language). The code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter case, the remote computer can be connected to the user's computer via any type of network including a local area network ("LAN") or a wide area network ("WAN"), or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0021] Throughout this specification, references to "an embodiment," "embodiment," or similar language mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment. Therefore, unless expressly stated otherwise, the phrases "in an embodiment," "in an embodiment," and similar language appearing throughout the specification may, but not necessarily all, refer to the same embodiment, but rather mean "one or more, but not all, embodiments." Unless expressly stated otherwise, the terms "comprising," "including," "having," and variations thereof mean "comprising but not limited to." Unless expressly stated otherwise, the list of items does not imply that any or all of the items are mutually exclusive. Unless expressly stated otherwise, the terms "a / an" and "the" also mean "one or more."

[0022] Furthermore, the features, structures, or characteristics described in the embodiments can be combined in any suitable manner. Numerous specific details, such as examples of programming, software modules, user selection, network transactions, database queries, database structures, hardware modules, hardware circuits, hardware chips, etc., are provided in the following description to provide a thorough understanding of the embodiments. However, those skilled in the art will recognize that the embodiments can be practiced without one or more of the specific details or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations have not been shown or described in detail to avoid obscuring aspects of the embodiments.

[0023] The following describes aspects of embodiments with reference to schematic flowcharts and / or schematic block diagrams of methods, apparatus, systems, and program products according to embodiments. It should be understood that each block in the schematic flowcharts and / or schematic block diagrams, as well as combinations of blocks in the schematic flowcharts and / or schematic block diagrams, can be implemented by code. The code can be provided to a processor of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus to produce a machine, such that instructions executable via the processor of the computer or other programmable data processing apparatus create components for implementing the functions / actions specified in one or more schematic flowchart and / or schematic block diagram blocks.

[0024] The code may also be stored in a storage device that can direct a computer, other programmable data processing equipment or other means to function in a particular manner, such that the instructions stored in the storage device produce an article of writing containing instructions that implement functions / actions specified in one or more schematic flowcharts and / or schematic block diagrams.

[0025] The code may also be loaded onto a computer, other programmable data processing apparatus or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer-implemented process, such that the code executing on the computer or other programmable device provides a process for implementing a function / action specified in one or more flowcharts and / or block diagrams.

[0026] The schematic flowcharts and / or block diagrams in the illustrations depict the architecture, functionality, and operation of possible implementations of devices, systems, methods, and program products according to various embodiments. In this regard, each block in the schematic flowcharts and / or block diagrams may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function.

[0027] It should also be noted that in some alternative implementations, the functions mentioned in the boxes may not appear in the order shown in the diagrams. For example, depending on the functionality involved, two boxes shown consecutively may actually be executed substantially simultaneously, or these boxes may sometimes be executed in reverse order. Other steps and methods are conceivable that are functionally, logically, or effectively equivalent to one or more boxes or portions thereof in the illustrated diagrams.

[0028] While various arrow and line types may be used in flowcharts and / or block diagrams, it should be understood that they do not limit the scope of the corresponding embodiments. In practice, some arrows or other connectors may be used to individually indicate the logical flow of the depicted embodiment. For example, an arrow may indicate a wait or monitoring period of unspecified duration between the enumerated steps of the depicted embodiment. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, may be implemented by a system based on dedicated hardware, or a combination of dedicated hardware and code, that performs the specified function or action.

[0029] The description of the elements in each figure can be referenced to the elements in the preceding figures. In all figures, the same numbers refer to the same elements, and alternative embodiments containing the same elements are also included.

[0030] Figure 1 An embodiment of a wireless communication system 100 for requesting side-link positioning reference signal resources is described. In one embodiment, the wireless communication system 100 includes a remote unit 102 and a network unit 104. Although Figure 1 A specific number of remote units 102 and network units 104 are depicted, but those skilled in the art will recognize that the wireless communication system 100 may contain any number of remote units 102 and network units 104.

[0031] In one embodiment, remote unit 102 may include a computing device, such as a desktop computer, laptop computer, personal digital assistant (“PDA”), tablet computer, smartphone, smart TV (e.g., a TV connected to the Internet), set-top box, game console, security system (including security cameras), automotive computer, network device (e.g., router, switch, modem), aircraft, drone, etc. In some embodiments, remote unit 102 includes a wearable device, such as a smartwatch, fitness tracker, optical head-mounted display, etc. Furthermore, remote unit 102 may be referred to as a subscriber unit, mobile device, mobile station, user, terminal, mobile terminal, fixed terminal, subscriber station, UE, user terminal, device, or other terms used in the art. Remote unit 102 may communicate directly with one or more of network units 104 via UL communication signals. In some embodiments, remote unit 102 may communicate directly with other remote units 102 via sidelink communication.

[0032] Network units 104 can be distributed across geographical regions. In some embodiments, network element 104 may also be referred to as and / or may include one or more of the following: access point, access terminal, base station, base station, location server, core network (“CN”), radio network entity, Node-B, evolved node-B (“eNB”), 5G node-B (“gNB”), home Node-B, relay node, device, core network, air server, radio access node, access point (“AP”), new radio (“NR”), network entity, access and mobility management function (“AMF”), unified data management (“UDM”), unified data repository (“UDR”), UDM / UDR, policy control function (“PCF”), radio access network (“RAN”), network slice selection function (“NSSF”), operation, administration and management (“OAM”), session management function (“SMF”), user plane function (“UPF”), application function, authentication server function (“AUSF”), security anchoring function (“SEAF”), trusted non-3GPP gateway function (“TNGF”), or any other term used in the art. Network unit 104 is typically a portion of a wireless access network comprising one or more controllers communicatively coupled to one or more corresponding network units 104. The wireless access network is typically communicatively coupled to one or more core networks, which may be coupled to other networks, such as the Internet and public switched telephone networks, and other networks. These and other elements of the wireless access and core networks are not described but are generally well known to those skilled in the art.

[0033] In one implementation, the wireless communication system 100 is compatible with the standardized NR protocol in the 3rd Generation Partnership Project (“3GPP”), wherein network unit 104 uses an OFDM modulation scheme for transmission on the downlink (“DL”) and remote unit 102 uses a single-carrier frequency division multiple access (“SC-FDMA”) or orthogonal frequency division multiplexing (“OFDM”) scheme for transmission on the uplink (“UL”). However, more generally, the wireless communication system 100 may implement another open or proprietary communication protocol, such as WiMAX, IEEE 802.11 variants, GSM, GPRS, UMTS, LTE variants, CDMA2000, Bluetooth®, ZigBee, Sigfoxx, and other protocols. This disclosure is not intended to limit implementation to any particular wireless communication system architecture or protocol.

[0034] Network unit 104 can serve multiple remote units 102 within a service area (e.g., a cell or cell sector) via a wireless communication link. Network unit 104 transmits DL communication signals in the time, frequency, and / or spatial domains to serve the remote units 102.

[0035] In various embodiments, remote unit 102 may transmit a request for at least one resource for lateral link positioning reference signals. In some embodiments, remote unit 102 may receive a response to a request for at least one resource for lateral link positioning reference signals. In some embodiments, remote unit 102 may transmit lateral link positioning reference signals in at least one resource. In various embodiments, remote unit 102 may transmit a report containing estimated positioning information. Therefore, remote unit 102 may be used to request lateral link positioning reference signal resources.

[0036] Figure 2 One embodiment of a device 200 for requesting side-link location reference signal resources is depicted. Device 200 includes one embodiment of a remote unit 102. Furthermore, the remote unit 102 may include a processor 202, a memory 204, an input device 206, a display 208, a transmitter 210, and a receiver 212. In some embodiments, the input device 206 and the display 208 are combined into a single device, such as a touchscreen. In some embodiments, the remote unit 102 may not include any input device 206 and / or display 208. In various embodiments, the remote unit 102 may include one or more of the processor 202, memory 204, transmitter 210, and receiver 212, and may not include the input device 206 and / or display 208.

[0037] In one embodiment, processor 202 may include any known controller capable of executing computer-readable instructions and / or performing logical operations. For example, processor 202 may be a microcontroller, microprocessor, central processing unit (“CPU”), graphics processing unit (“GPU”), auxiliary processing unit, field-programmable gate array (“FPGA”), or similar programmable controller. In some embodiments, processor 202 executes instructions stored in memory 204 to perform the methods and routines described herein. Processor 202 is communicatively coupled to memory 204, input device 206, display 208, transmitter 210, and receiver 212.

[0038] In one embodiment, memory 204 is a computer-readable storage medium. In some embodiments, memory 204 includes volatile computer storage media. For example, memory 204 may include RAM, which includes dynamic RAM (“DRAM”), synchronous dynamic RAM (“SDRAM”), and / or static RAM (“SRAM”). In some embodiments, memory 204 includes non-volatile computer storage media. For example, memory 204 may include a hard disk drive, flash memory, or any other suitable non-volatile computer storage device. In some embodiments, memory 204 includes both volatile and non-volatile computer storage media. In some embodiments, memory 204 also stores program code and related data, such as an operating system or other controller algorithms operating on remote unit 102.

[0039] In one embodiment, input device 206 may include any known computer input device, including a touch panel, buttons, keyboard, stylus, microphone, etc. In some embodiments, input device 206 may be integrated with display 208, such as as a touchscreen or similar touch-sensitive display. In some embodiments, input device 206 includes a touchscreen, enabling text input using a virtual keyboard displayed on the touchscreen and / or by handwriting on the touchscreen. In some embodiments, input device 206 includes two or more different devices, such as a keyboard and a touch panel.

[0040] In one embodiment, display 208 may include any known electronically controllable display or display device. Display 208 may be designed to output visual, auditory, and / or tactile signals. In some embodiments, display 208 includes an electronic display capable of outputting visual data to a user. For example, display 208 may include, but is not limited to, a liquid crystal display (“LCD”), a light-emitting diode (“LED”) display, an organic light-emitting diode (“OLED”) display, a projector, or similar display devices capable of outputting images, text, etc., to a user. As another non-limiting example, display 208 may include a wearable display, such as a smartwatch, smart glasses, a head-up display, etc. Furthermore, display 208 may be a component of a smartphone, personal digital assistant, television, desktop computer, laptop computer, personal computer, vehicle dashboard, etc.

[0041] In some embodiments, display 208 includes one or more speakers for generating sound. For example, display 208 may generate auditory warnings or notifications (e.g., beeps or chimes). In some embodiments, display 208 includes one or more tactile devices for generating vibration, motion, or other tactile feedback. In some embodiments, all or part of display 208 may be integrated with input device 206. For example, input device 206 and display 208 may form a touchscreen or similar touch-sensitive display. In other embodiments, display 208 may be located near input device 206.

[0042] In some embodiments, transmitter 210 transmits a request for at least one resource for lateral link positioning reference signals. In various embodiments, receiver 212 receives a response to the request for at least one resource for lateral link positioning reference signals. Transmitter 210 transmits the lateral link positioning reference signals in at least one resource and transmits a report containing estimated positioning information.

[0043] Although only one transmitter 210 and one receiver 212 are described, the remote unit 102 may have any suitable number of transmitters 210 and receivers 212. The transmitters 210 and receivers 212 may be of any suitable type. In one embodiment, the transmitters 210 and receivers 212 may be part of a transceiver.

[0044] Figure 3 An embodiment of a device 300 for indicating lateral link location reference signal resources is depicted. Device 300 includes one embodiment of a network unit 104. Furthermore, network unit 104 may include a processor 302, a memory 304, an input device 306, a display 308, a transmitter 310, and a receiver 312. As will be understood, processor 302, memory 304, input device 306, display 308, transmitter 310, and receiver 312 may be substantially similar to processor 202, memory 204, input device 206, display 208, transmitter 210, and receiver 212 of remote unit 102, respectively.

[0045] In some embodiments, the lateral link positioning method can be used to assist in accurate positioning measurements in indoor factory environments and / or vehicle positioning. In various embodiments, accuracy and latency requirements may vary between indoor factory environments and vehicle-to-everything (“V2X”) communications. In some embodiments, the lateral link adds another dimension by calculating the relative positioning between objects and / or vehicles. In such embodiments, several anchor nodes transmitting reference signals on the lateral link (“SL”) for positioning (e.g., an SL positioning reference signal (“PRS”)) can play a significant role in high-accuracy positioning. In some embodiments, there may be methods for configuring a resource pool structure for the reference signal used for SL positioning, methods for resource allocation and transmitting the reference signal in Mode 1, and / or methods for interworking between the UE-to-network interface (“Uu”) and SL positioning to achieve high-accuracy positioning.

[0046] In some embodiments, the sidelink resource pool can be used to transmit only SL data, and mode 2 resource allocation (e.g., UE-autonomous resource allocation) and mode 1 resource allocation (e.g., gNB resource allocation) can be used for SL data transmission. In some embodiments, the system configuration and / or resource allocation method of the resource pool can be used to transmit reference signals on the SL for positioning.

[0047] As used herein, the terms eNB and / or gNB can be used for a base station, but can be replaced by any other radio access node (e.g., base station (“BS”), eNB, gNB, AP, NR, etc.). Furthermore, the embodiments described herein are described in the context of 5G NR; however, they are applicable to other mobile communication systems configured to support serving cells and / or carriers for sidelink communication via a UE-to-UE interface (e.g., a PC5 interface).

[0048] It should be noted that while SL PRS may be used in some embodiments, SL positioning can be estimated using any SL reference signal (“RS”). In various embodiments, one type of SL RS to be used for positioning estimation may be provided to the user equipment (“UE”).

[0049] In some embodiments, there may be anchored UEs (e.g., UEs whose own location is known precisely). In some embodiments, there may be non-anchored UEs (e.g., UEs with unknown locations and / or location information).

[0050] In various embodiments, model information in signaling may mean an SL PRS transmission from a one-to-one (e.g., TX UE to RX UE), a one-to-many (e.g., TX UE to multiple RX UEs), a many-to-one (e.g., multiple RX UEs to TX UE), and / or a bidirectional SL PRS transmission. In some embodiments, LPP signaling and / or gNB downlink signaling may indicate the model to be used for SL positioning and / or SL positioning technology.

[0051] In various embodiments, the resource pool bandwidth or SL PRS bandwidth for SL PRS transmission may be configured across an SL bandwidth portion (“BWP”) and / or an SL carrier for wideband SL PRS transmission. In some embodiments, a resource pool and / or SL PRS bandwidth may be provided for each carrier, and multiple sidelink carriers may be configured per UE for SL PRS transmission. In some embodiments, the number of symbols used in a time slot for SL PRS transmission may be configured. In such embodiments, the following may also be configured: SL PRS frequency offset relative to each member in the group, SL PRS comb pattern, SL PRS periodicity, repetition pattern, repetition factor, SL PRS transmission power related parameters, and / or silence mode.

[0052] In various embodiments, SL auxiliary data may include a mapping of positioning accuracy and latency to priority and remaining packet delay budget (“PDB”), SL PRS transmission timing per resource pool, the number of sub-channels for SL PRS transmission per resource pool, SL positioning techniques (e.g., Time Difference of Arrival (“TDOA”), Angle of Departure (“AoD”), etc.), SL positioning type (e.g., Model A, Model B, or Model C), reporting configuration, source-destination ID information for SL PRS transmission, source-destination group ID, minimum communication range (“MCR”), anchored UE positioning information (e.g., network-dependent or UE-based positioning or relative positioning), etc. In some embodiments, PC5 RRC signaling may carry information about the SL PRS resource configuration for unicast transmission. In some embodiments, the destination identifier (“ID”) may mean the UE ID.

[0053] In a first embodiment, on-demand SL positioning and / or on-demand SL PRS transmission can be used. In such embodiments, on-demand SL PRS transmission can be configured by the gNB and / or location management function (“LMF”), or can be requested by the TX UE to dynamically allocate SL PRS resources or update PRS resource configuration relative to the positioning method, and dynamically update the SL PRS transmission configuration information (“TCI”) and / or quasi-co-location (“QCL”) assumptions. Furthermore, in such embodiments, the LMF provides an initial QCL and / or TCI for SL PRS transmission. In one embodiment of the first embodiment, the same QCL and / or TCI states and / or spatial filters can be applied by the UE in all transmission times, and in another embodiment of the first embodiment, different QCL and / or TCI states and / or spatial filters can be applied by the UE in different transmission times.

[0054] In some embodiments, resource allocation for the SL PRS can be accomplished using mode 1-based scheduling. In some embodiments of the first embodiment, a UE configured for DL ​​positioning technology can determine that a positioning error estimate exceeds a certain threshold and trigger SL positioning technology to calculate the relative positioning between UEs, thereby correcting the positioning estimate and reporting the positioning estimate to the LMF. In such embodiments, SL positioning can be used to supplement Uu positioning (e.g., DL-based positioning) to provide better location estimation. In various embodiments of the first embodiment, the positioning error estimate is calculated by the LMF and can be provided to the TX UE or by the UE based on network-based or UE-based positioning. In some embodiments, the network can provide a positioning accuracy threshold to the UE using the LTE Positioning Protocol (“LPP”).

[0055] In various embodiments, the on-demand SL PRS configuration may have a source-destination ID, and the SL PRS configuration may be applicable to a specific destination group ID.

[0056] In some embodiments, if the gNB or LMF wants to determine the precise location between a first UE (UEA) and a second UE (UEB), then the LPP signaling may contain UEA location information (e.g., it may be coarse absolute location information), and the UEB may use on-demand SL positioning technology to determine the precise location between UEA and UEB. In such embodiments, the UE may use one or more panels from the available panel set for SL PRS transmission based on the provided coarse location.

[0057] In various embodiments, if an LMF or gNB requests on-demand SL positioning for one or more UEs (e.g., between a first UE (UEA) and a second UE (UEB)), the LMF or gNB can provide information about the absolute location of one of the UEs (UEA) to the UEB, allowing the UEB to use SL positioning technology to accurately calculate the positions between them or to calculate the absolute location of the UEB. It will be understood that sharing the locations of other UEs in LPP or gNB signaling is not limited to SL positioning.

[0058] In some embodiments, the Uu positioning information of the first UE (UEA) may be transmitted from the UEA to the second UE (UEB) via SCI, Media Access Control (“MAC”) control element (“CE”), or RRC signaling to help the UEB calculate the precise relative or absolute position by further transmitting SL PRS. As you will understand, one or more embodiments described herein may be combined.

[0059] Figure 4 Figure 400 illustrates a network communication diagram of one embodiment of on-demand side-link location reference signal resource transmission. Figure 400 illustrates SL UE B 402, SL UE A 404, gNB 406, and location server LMF 408. As you will understand, each of the illustrated messages may contain one or more messages.

[0060] In the first communication 412 transmitted between gNB 406 and location server LMF 408, gNB 406 transmits PRS configuration (e.g., using the NRPPa protocol) to location server LMF 408.

[0061] In the second communication 414 from location server LMF 408 to SL UE A 404, location server LMF 408 transmits auxiliary information for SL positioning (e.g., SL RS, timing, repetition, comb pattern, subchannel size, BW, positioning technology, report type) (e.g., using LPP protocol) to SL UE A 404.

[0062] In the third communication 416 from location server LMF 408 to SL UE A 404, location server LMF 408 transmits a location request (e.g., using the LPP protocol) to SL UE A 404.

[0063] SL UE A 404 indicates that 418 cannot meet the accuracy requirements and SL positioning is initiated.

[0064] Explain models A 420, B 422, and C 424.

[0065] In the fourth communication 426, which transmits data from SL UE A 404 to SL UE B 402, SL UE A 404 transmits SL PRS data to SL UE B 402, and in the fifth communication 428, which transmits data from SL UE B 402 to SL UE A 404, SL UE B 402 transmits SL location reports to SL UE A 404. The fourth communication 426 and the fifth communication 428 can be considered as model A 420.

[0066] In the sixth communication 430, which transmits from SL UE A 404 to SL UE B 402, SL UE A 404 transmits an SL PRS transmission request to SL UE B 402, and in the seventh communication 432, which transmits from SL UE B 402 to SL UE A 404, SL UE B 402 transmits an SL PRS transmission to SL UE A 404. The sixth communication 430 and the seventh communication 432 can be considered as model B422.

[0067] In the eighth communication 434, which transmits data from SL UE A 404 to SL UE B 402, SL UE A 404 transmits an SL PRS transmission and an SL PRS transmission request to SL UE B 402. In the ninth communication 436, which transmits data from SL UE B 402 to SL UE A 404, SL UE B 402 transmits an SL PRS transmission to SL UE A 404. In the tenth communication 438, which transmits data from SL UE B 402 to SL UE A 404, SL UE B 402 transmits an SL report to SL UE A 404. The eighth, ninth, and tenth communications 434 can be considered as model C 424.

[0068] SL UE A 404 calculates 440 absolute positioning.

[0069] In the eleventh communication 442 from SL UE A 404 to location server LMF 408, SL UE A 404 transmits a location report to location server LMF 408.

[0070] In the second embodiment, Mode 1 on-demand SL PRS can be used. In some embodiments, uplink control signaling can be configured for UEs within coverage area to request resources from the gNB or LMF for SL PRS transmission. In some embodiments, a separate scheduling request (“SR”) can be configured to request resources for SL PRS and / or separate SR configurations for different accuracy and latency requirements, and / or the SR can carry additional information about accuracy and / or latency requirements. In various embodiments, RRC signaling can carry location-related requests, accuracy, latency, etc. In some embodiments, a MAC CE can be used to communicate SL PRS requests, accuracy, and / or latency to the gNB.

[0071] In some embodiments, the gNB may configure multiple SL PRS resources for the UE using RRC signaling, and the UE may activate one or more of these resources depending on the accuracy and / or latency requirements of using SCI, MAC CE, or higher-level signaling. In various embodiments, SL grants or RRC signaling from the gNB may activate SL PRS resources from a configured resource set. In such embodiments, SL grants from the gNB may contain one or more of the following: SL PRS comb pattern, timing, SL PRS offset, destination ID, SL TCI, QCL information, and / or reporting configuration (e.g., report type, resources used for reporting).

[0072] In some embodiments, such as for on-demand SL PRS transmissions, reports from the UE to the gNB may be based on uplink control information (“UCI”) on the physical uplink control channel (“PUCCH”), the physical uplink shared channel (“PUSCH”), MAC CE, or RRC signaling. In such embodiments, combined Uu and SL location reports can be configured.

[0073] In a third embodiment, SCI content for SL PRS can be defined. In some embodiments, the resource pool configuration includes a first SCI format and / or a first SCI size. In various embodiments, the first SCI format or SCI may differ from both the resource pool containing SL data and the resource pool containing SL PRS. In some embodiments, the same SCI size may be used for both the resource pool containing SL data and the resource pool containing SL PRS, and a single bit may be used to indicate whether the SCI format content is for SL data or SL PRS transmission.

[0074] Figure 5 A schematic block diagram 500 is provided to illustrate one embodiment of the sidelink configuration information model. Specifically, model A SCI 502, model B SCI 504, and model C SCI 506 are illustrated.

[0075] In one embodiment, model A SCI 502 includes first SCI content, which includes one or more parameters for SL PRS transmission. The first SCI content and SL PRS can be transmitted in the same time slot, and the first SCI symbol and / or SL PRS can be multiplexed in different time domain symbols. One or more parameters used for SL PRS transmission may include: 1) a bit indicating that SLPRS instead of SL data (e.g., an RP for allowing multiplexing of SL data and / or SL PRS) or a new radio network temporary identifier (“RNTI”) (e.g., PRS-RNTI) can be used to scramble the SCI and implicitly enable the UE to identify SL PRS-related signaling; 2) the priority of SL PRS transmission in the SCI (e.g., defined as a priority based on accuracy and latency, first location time, or according to the location service delay budget); 3) the number of subchannels used for SL PRS transmission; 4) the time slots used for the initial SL PRS transmission and the reserved resources for future SL PRS transmissions; 5) the reserved interval in terms of time periodicity; 6) a bit indicating that a second SCI will not be transmitted; 7) a field SL PRS comb pattern indication (e.g., instead of the demodulation reference signal (“DMRS”) pattern); 8) SL 9) Subcarrier offset relative to the starting SC in the PRS offset (e.g., the offset of the starting SC relative to the resource pool, carrier, or bandwidth portion (“BWP”); 10) If the bit indicates that no SL data is being transmitted, then the indication of other fields related to SL data transmission, such as modulation and coding scheme (“MCS”), β offset, etc., is ignored; 11) Source ID (e.g., the destination is transmitted in Level 1 or higher signaling); 12) QCL and / or TCI related information for SL PRS reception; 13) Positioning technology to be used by the RX UE; and / or 14) Slot offset indicating the slot offset used for reporting transmission.

[0076] In one embodiment, Model B SCI 504 includes a request message for SL PRS transmission indicated in a first or second level SCI, MAC CE, or PC5 Radio Resource Control (“RRC”). The request for SL PRS transmission to the receiving (“RX”) UE can be transmitted via any SCI transmission that schedules SL data. The request message may include: 1) a bit indicating the SL PRS request and / or trigger (e.g., a TX-UE requesting SL PRS from the RX UE, a transmission of the current SCI for a transport block (“TB”) to reserve future PRS resources); 2) the SL PRS timing from the RX UE to the transmitting (“TX”) UE; and / or 3) determining the SL PRS offset for each UE based on the member ID and / or broadcast type (e.g., many-to-one, one-to-one). In such embodiments, the signaling for the SL PRS configuration for transmissions from the LMF to the UE may have common RRC signaling.

[0077] Model C SCI 506 comprises a combination of SCIs, which includes higher-layer signaling based on Model A SCI 502 and Model B SCI 504 for SL PRS transmissions from TX UE to RX UE and from RX UE to TX UE. It is understood that some SCIs from any of Model A SCI 502, Model B SCI 504, and Model C SCI 506 may be transmitted in the second SCI.

[0078] In some embodiments, the TX UE can configure multiple PRS triggers with overlapping PRS reporting windows. Furthermore, in such embodiments, the RX UE can transmit a PRS ID, session ID, trigger ID, request ID, or positioning technology along with the PRS report to associate the PRS trigger with the PRS report. Additionally, in such embodiments, each PRS trigger may have a different SL positioning technology. In some embodiments, SCI, MAC CE, or higher-level signaling can indicate a separate SL positioning technology to be applied to each of the multiple repetitions. In various embodiments, multiple SL positioning technologies can be applied to each of the multiple repetitions.

[0079] In the fourth embodiment, SL location reports between SL UEs can be used. In some embodiments, details regarding report transmission may include: 1) one or more report transmissions (e.g., MAC CE, Physical Side Link Feedback Channel (“PSFCH”), SCI, RRC – reports can be transmitted using MAC CE, PSFCH, or SCI); 2) PSFCH – reports are transmitted to TXUEs in the same resource pool – the time interval between SL PRS and reports can be configured per RP, and the PSFCH resources for reporting can be based on a subset of the subchannels used for PRS transmission and can start from the lowest subchannel index; 3) MAC CE – a new MAC CE with fields for location reporting can be used – the waiting time limits for report transmission and / or the priority of MAC CE can be configured (e.g., pre-configured) by the gNB based on the accuracy of the location update and the waiting time – individual SRs can be configured to request mode 1 resources; 4) SCI – a first or second SCI can carry information about the location report; and / or 5) RRC – PC5 RRC signaling can be used for report transmission.

[0080] In some embodiments, the location report contains information associated with a source-destination ID and / or a destination group ID. In various embodiments, the location report can be transmitted via unicast or multicast. In some embodiments, the broadcast type of the report transmission can be signaled by the UE or a higher layer.

[0081] In a fifth embodiment, the SL location report can be transmitted to the LMF. In such embodiments, the SL location report may contain relative location information calculated in the group for each source-destination ID or link ID from the TX UE to any RX UE, and the report may be tagged with the corresponding source-destination ID.

[0082] Figure 6 This is a flowchart illustrating one embodiment of a method 600 for requesting a side-link location reference signal resource. In some embodiments, method 600 is performed by a device such as remote unit 102. In some embodiments, method 600 may be performed by a processor executing program code, such as a microcontroller, microprocessor, CPU, GPU, auxiliary processing unit, FPGA, etc.

[0083] In various embodiments, method 600 includes transmitting 602 a request for at least one resource for lateral link positioning reference signals. In some embodiments, method 600 includes receiving 604 a response to the request for at least one resource for lateral link positioning reference signals. In some embodiments, method 600 includes transmitting 606 lateral link positioning reference signals in at least one resource. In various embodiments, method 600 includes transmitting 608 a report containing estimated positioning information.

[0084] In some embodiments, the request is transmitted using a scheduling request configured to make a request to the gNB. In some embodiments, the scheduling request is configured for a specific accuracy, a specific latency, carrying information about a specific accuracy, carrying information about a specific latency, or a combination thereof. In various embodiments, transmitting the request includes transmitting the request using Radio Resource Control signaling or using Media Access Control (MAC) elements.

[0085] In one embodiment, the response includes a configuration grant resource for the transmission of a lateral link positioning reference signal or a dynamic grant resource for the transmission of a lateral link positioning reference signal. In some embodiments, the configuration grant resource is activated based on accuracy requirements, latency requirements, or a combination thereof, and is activated using lateral link control information, media access control elements, or higher-layer signaling. In some embodiments, method 600 further includes receiving a lateral link grant, wherein the lateral link grant includes a lateral link positioning reference signal comb pattern, timing, lateral link positioning reference signal offset, destination identifier, lateral link transmission configuration indicator, quasi-co-address information, report configuration, or a combination thereof.

[0086] In various embodiments, method 600 further includes transmitting a report using physical uplink control channel transmission, uplink control information on a physical uplink shared channel, media access control control elements, radio resource control signaling, physical sidelink feedback channel transmission, or sidelink control information. In one embodiment, the report includes information indicating a source identifier, a destination identifier, a group destination identifier, or a combination thereof. In some embodiments, unicast or multicast transmission is used to transmit the report.

[0087] In some embodiments, method 600 further includes transmitting lateral link control information for lateral link positioning reference signal transmission together with the lateral link positioning reference signal transmission. In various embodiments, the lateral link control information and the lateral link positioning reference signal transmission are transmitted in the same time slot. In one embodiment, a first lateral link control information symbol and the lateral link positioning reference signal transmission are multiplexed in different time domain symbols.

[0088] In some embodiments, the sidelink control information includes: a bit indicating the presence of a sidelink location reference signal transmission or sidelink data; a priority for the sidelink location reference signal transmission in the sidelink control information defined based on accuracy, latency, or a combination thereof; an indicator indicating time and frequency resources for transmitting the sidelink location reference signal, wherein the time and frequency resources include resources reserved for initial sidelink location reference signal transmission and future transmissions; or a combination thereof. In some embodiments, the sidelink control information further includes: a field indicating a sidelink location reference signal comb pattern; a sidelink location reference signal offset; quasi-co-location information; a positioning technique indicating time difference of arrival, angle of departure, angle of arrival, multiple round-trip time, or a combination thereof; a report transmission slot offset; or a combination thereof. In various embodiments, method 600 further includes transmitting a plurality of presence indicators indicating the sidelink location reference signal or a request for transmission of the sidelink location reference signal, wherein each of the plurality of presence indicators or requests is associated with a positioning technique for a plurality of receiver user equipments.

[0089] In one embodiment, the sidelink control information includes: a request bit indicating a request from at least one receiver user equipment for at least one resource for a sidelink positioning reference signal; time-frequency resource reservation information; a sidelink positioning reference signal offset at each receiver user equipment based on an internal member identifier; a broadcast type of the sidelink positioning reference signal; reception of the sidelink positioning reference signal; or a combination thereof. In some embodiments, method 600 further includes transmitting a plurality of presence indicators indicating the sidelink positioning reference signal or a request for transmission of the sidelink positioning reference signal, wherein each of the plurality of presence indicators or requests is associated with a positioning technique for the plurality of receiver user equipments.

[0090] In one embodiment, a method includes: transmitting a request for at least one resource for lateral link positioning reference signaling; receiving a response to the request for at least one resource for lateral link positioning reference signaling; transmitting the lateral link positioning reference signaling in the at least one resource; and transmitting a report containing estimated positioning information.

[0091] In some embodiments, the request is transmitted using a scheduling request configured to make a request to the gNB.

[0092] In some embodiments, a scheduling request is configured to be for a specific accuracy, for a specific wait time, carrying information about a specific accuracy, carrying information about a specific wait time, or a combination thereof.

[0093] In various embodiments, transmitting the request includes using radio resource control signaling or using media access control elements to transmit the request.

[0094] In one embodiment, the response includes either a configuration grant resource for transmitting a lateral link positioning reference signal or a dynamic grant resource for transmitting a lateral link positioning reference signal.

[0095] In some embodiments, configuration authorization resources are activated based on accuracy requirements, latency requirements, or a combination thereof, and are activated using sidelink control information, media access control elements, or higher-layer signaling.

[0096] In some embodiments, the method further includes receiving a sidelink grant, wherein the sidelink grant includes a sidelink location reference signal comb pattern, timing, sidelink location reference signal offset, destination identifier, sidelink transmission configuration indicator, quasi-co-location information, report configuration, or a combination thereof.

[0097] In various embodiments, the method further includes transmitting reports using physical uplink control channel transmission, uplink control information on physical uplink shared channel, media access control control elements, radio resource control signaling, physical sidelink feedback channel transmission, or sidelink control information.

[0098] In one embodiment, the report includes information indicating a source identifier, a destination identifier, a group destination identifier, or a combination thereof.

[0099] In some embodiments, unicast or multicast transmission is used to transmit reports.

[0100] In some embodiments, the method further includes transmitting lateral link control information for lateral link positioning reference signal transmission together with lateral link positioning reference signal transmission.

[0101] In various embodiments, sidelink control information and sidelink positioning reference signal transmission are transmitted in the same time slot.

[0102] In one embodiment, the first lateral link control information symbol and the lateral link positioning reference signal are multiplexed in different time domain symbols.

[0103] In some embodiments, the sidelink control information includes: a bit indicating the presence of sidelink positioning reference signal transmission or sidelink data; the priority of sidelink positioning reference signal transmission in the sidelink control information is defined based on accuracy, latency, or a combination thereof; an indicator indicating time and frequency resources for transmitting the sidelink positioning reference signal, wherein the time and frequency resources include resources for initial sidelink positioning reference signal transmission and resources reserved for future transmission; or a combination thereof.

[0104] In some embodiments, the lateral link control information further includes: a field indicating the comb pattern of the lateral link positioning reference signal; a lateral link positioning reference signal offset; quasi-co-location information; a positioning technique indicating the time difference of arrival, departure angle, angle of arrival, multiple round-trip time, or a combination thereof; a report transmission slot offset; or a combination thereof.

[0105] In various embodiments, the method further includes transmitting a plurality of presence indicators or a request for transmission of the side-link positioning reference signal, wherein each of the plurality of presence indicators or requests is associated with a positioning technique for a plurality of receiver user equipments.

[0106] In one embodiment, the sidelink control information includes: a request bit indicating a request from at least one receiver user equipment for at least one resource for a sidelink positioning reference signal; time-frequency resource reservation information; sidelink positioning reference signal offset at each receiver user equipment based on an internal member identifier; broadcast type of the sidelink positioning reference signal; reception of the sidelink positioning reference signal; or a combination thereof.

[0107] In some embodiments, the method further includes transmitting a plurality of presence indicators or a request for transmission of the side-link positioning reference signal, wherein each of the plurality of presence indicators or requests is associated with a positioning technique for a plurality of receiver user equipments.

[0108] In one embodiment, the device includes: a transmitter that transmits a request for at least one resource for lateral link positioning reference signals; and a receiver that receives a response to the request for at least one resource for lateral link positioning reference signals, wherein the transmitter transmits the lateral link positioning reference signals in at least one resource and transmits a report containing estimated positioning information.

[0109] In some embodiments, the request is transmitted using a scheduling request configured to make a request to the gNB.

[0110] In some embodiments, a scheduling request is configured to be for a specific accuracy, for a specific wait time, carrying information about a specific accuracy, carrying information about a specific wait time, or a combination thereof.

[0111] In various embodiments, the transmitter transmitting the request includes a transmitter that uses radio resource control signaling or a media access control element to transmit the request.

[0112] In one embodiment, the response includes either a configuration grant resource for transmitting a lateral link positioning reference signal or a dynamic grant resource for transmitting a lateral link positioning reference signal.

[0113] In some embodiments, configuration authorization resources are activated based on accuracy requirements, latency requirements, or a combination thereof, and are activated using sidelink control information, media access control elements, or higher-layer signaling.

[0114] In some embodiments, the receiver receives a sidelink grant, and the sidelink grant includes a sidelink location reference signal comb pattern, timing, sidelink location reference signal offset, destination identifier, sidelink transmission configuration indicator, quasi-co-location information, report configuration, or a combination thereof.

[0115] In various embodiments, the transmitter uses physical uplink control channel transmission, uplink control information on physical uplink shared channel, media access control control elements, radio resource control signaling, physical sidelink feedback channel transmission, or sidelink control information to transmit reports.

[0116] In one embodiment, the report includes information indicating a source identifier, a destination identifier, a group destination identifier, or a combination thereof.

[0117] In some embodiments, unicast or multicast transmission is used to transmit reports.

[0118] In some embodiments, the transmitter transmits lateral link control information for lateral link positioning reference signal transmission together with the lateral link positioning reference signal transmission.

[0119] In various embodiments, sidelink control information and sidelink positioning reference signal transmission are transmitted in the same time slot.

[0120] In one embodiment, the first lateral link control information symbol and the lateral link positioning reference signal are multiplexed in different time domain symbols.

[0121] In some embodiments, the sidelink control information includes: a bit indicating the presence of sidelink positioning reference signal transmission or sidelink data; the priority of sidelink positioning reference signal transmission in the sidelink control information is defined based on accuracy, latency, or a combination thereof; an indicator indicating time and frequency resources for transmitting the sidelink positioning reference signal, wherein the time and frequency resources include resources for initial sidelink positioning reference signal transmission and resources reserved for future transmission; or a combination thereof.

[0122] In some embodiments, the lateral link control information further includes: a field indicating the comb pattern of the lateral link positioning reference signal; a lateral link positioning reference signal offset; quasi-co-location information; a positioning technique indicating the time difference of arrival, departure angle, angle of arrival, multiple round-trip time, or a combination thereof; a report transmission slot offset; or a combination thereof.

[0123] In various embodiments, the transmitter transmits a plurality of presence indicators or requests for transmission of the side-link positioning reference signal, and each of the plurality of presence indicators or requests is associated with a positioning technique for a plurality of receiver user equipments.

[0124] In one embodiment, the sidelink control information includes: a request bit indicating a request from at least one receiver user equipment for at least one resource for a sidelink positioning reference signal; time-frequency resource reservation information; sidelink positioning reference signal offset at each receiver user equipment based on an internal member identifier; broadcast type of the sidelink positioning reference signal; reception of the sidelink positioning reference signal; or a combination thereof.

[0125] In some embodiments, the transmitter transmits a plurality of presence indicators or requests for transmission of the side-link positioning reference signal, and each of the plurality of presence indicators or requests is associated with a positioning technique for a plurality of receiver user equipments.

[0126] Other specific embodiments may be practiced. The described embodiments should be considered in all respects as illustrative rather than restrictive. Therefore, the scope of the invention is indicated by the appended claims rather than by the foregoing description. All modifications falling within the equivalent meaning and scope of the claims should be covered within their scope.

Claims

1. A method executed by a user equipment (UE), the method comprising: Transmit sidelink control information (SCI), the SCI indicating a request for at least one resource for a sidelink positioning reference signal (SL-PRS), wherein the request is transmitted using available resources configured to make the request to a base station. The SL-PRS is transmitted in at least one resource, at least in part, based on the request, wherein the SL-PRS is transmitted in the same time slot as the SCI.

2. The method of claim 1, wherein the resource is configured for at least one of accuracy or waiting time, and carries information about the accuracy and information about the waiting time.

3. The method of claim 1, wherein transmitting the request comprises transmitting the request using Radio Resource Control (RRC) signaling or using Media Access Control (MAC) control element (CE).

4. The method of claim 1, further comprising receiving a response to the request, wherein the response contains configuration grant resources for the transmission of the SL-PRS or dynamic grant resources for the transmission of the SL-PRS.

5. The method of claim 4, wherein the configuration authorization resources are activated from a plurality of pre-configured configuration authorization resources based on accuracy requirements, latency requirements, or both, using the SCI, Media Access Control (MAC) control element (CE), or higher-level signaling.

6. The method of claim 1, further comprising receiving a side-link grant, wherein the side-link grant includes at least one of SL-PRS comb mode, timing, SL-PRS offset, destination identifier, side-link transport configuration indicator, quasi-co-located QCL information, and report configuration.

7. The method of claim 1, further comprising transmitting reports using Physical Uplink Control Channel (PUCCH), Uplink Control Information (UCI) on Physical Uplink Shared Channel (PUSCH), Media Access Control (MAC) Control Element (CE), Radio Resource Control (RRC) signaling, Physical Side Uplink Feedback Channel (PSFCH), or SCI.

8. The method of claim 7, wherein the report includes one or more of an indicator source identifier, a destination identifier, and a group destination identifier.

9. The method of claim 7, wherein the report is transmitted using unicast or multicast transmission.

10. The method of claim 1, further comprising transmitting a first SCI for the SL-PRS transmission together with the SL-PRS transmission.

11. The method of claim 10, wherein the first SCI and the SL-PRS transmission are multiplexed in different time-domain symbols.

12. The method of claim 10, wherein the first SCI comprises at least one of the following: A bit that indicates the presence of the SL-PRS transmission or side link data; The priority of the SL-PRS transmission in the SCI is defined based on accuracy, latency, or a combination thereof; and Indicators that indicate the time and frequency resources used for transmitting the SL-PRS, wherein the time and frequency resources include resources reserved for the initial SL-PRS transmission and for future transmission.

13. The method of claim 12, wherein the SCI further comprises one or more of the following: Field SL-PRS comb pattern indicator; SL-PRS offset; Quasi-co-address information; Positioning technology that indicates time difference of arrival, angle of departure, angle of arrival, round trip time, or a combination thereof; and Report transmission time slot offset.

14. The method of claim 12, further comprising transmitting a plurality of presence indicators indicating the SL-PRS or a request for the transmission of the SL-PRS, wherein each of the plurality of presence indicators or the request is associated with a positioning technology for a plurality of receiver UEs.

15. The method of claim 10, wherein the SCI comprises one or more of the following: A request bit, which indicates a request from at least one receiver user equipment for at least one resource for the SL-PRS; Time and frequency resource reservation information; Based on the SL-PRS offset at each receiver user equipment based on the internal group member identifier; The broadcast type of the SL-PRS; and The SL-PRS is received.

16. The method of claim 15, further comprising transmitting a plurality of presence indicators indicating the SL-PRS or a request for the transmission of the SL-PRS, wherein each of the plurality of presence indicators or the request is associated with a positioning technique for a plurality of receiver UEs.

17. A user equipment (UE) comprising: At least one memory; as well as At least one processor coupled to the at least one memory and configured such that the UE: Transmitted sidelink control information (SCI), the SCI indicating a request for at least one resource for a sidelink positioning reference signal (SL-PRS), wherein the request is transmitted using available resources configured to make the request to a base station; and The SL-PRS is transmitted in at least one resource, at least in part, based on the request, wherein the SL-PRS is transmitted in the same time slot as the SCI.

18. A processor for wireless communication, comprising: At least one controller coupled to at least one memory and configured such that the processor: Transmitted sidelink control information (SCI), the SCI indicating a request for at least one resource for a sidelink positioning reference signal (SL-PRS), wherein the request is transmitted using available resources configured to make the request to a base station; and The SL-PRS is transmitted in at least one resource, at least in part, based on the request, wherein the SL-PRS is transmitted in the same time slot as the SCI.

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