Preconfigured assistance data for sidelink positioning

Abstract

Aspects presented herein may enable a UE to be pre-configured with a set of assistance data (AD) for sidelink (SL) positioning. In one aspect, a first UE obtains an AD configuration associated with an SL positioning session, where the AD configuration includes multiple sets of AD. The first UE participates in the SL positioning session with at least one second UE. The first UE applies at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area ID associated with the location of the first UE.

Description

PRECONFIGURED ASSISTANCE DATA FOR SIDELINK POSITIONINGCROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of Greece Patent Application No. 20230100990, entitled “PRECONFIGURED ASSISTANCE DATA FOR SIDELINK POSITIONING” and filed on November 29, 2023, which is expressly incorporated by reference herein in its entirety.TECHNICAL FIELD

[0002] The present disclosure relates generally to communication systems, and more particularly, to wireless communication involving positioning.INTRODUCTION

[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0004] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (rnMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G LongTerm Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.BRIEF SUMMARY

[0005] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects. This summary neither identifies key or critical elements of all aspects nor delineates the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0006] In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus obtains an assistance data (AD) configuration associated with a sidelink (SL) positioning session, where the AD configuration includes multiple sets of AD. The apparatus participates in the SL positioning session with at least one second user equipment (UE). The apparatus applies at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area identification (ID) associated with the location of the first UE.

[0007] To the accomplishment of the foregoing and related ends, the one or more aspects may include the features hereinafter fully described and particularly pointed out in the claims. The following description and the drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed.BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.

[0009] FIG. 2A is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure.

[0010] FIG. 2B is a diagram illustrating an example of downlink (DL) channels within a subframe, in accordance with various aspects of the present disclosure.

[0011] FIG. 2C is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure.

[0012] FIG. 2D is a diagram illustrating an example of uplink (UL) channels within a subframe, in accordance with various aspects of the present disclosure.

[0013] FIG. 3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network.

[0014] FIG. 4 is a diagram illustrating an example of a UE positioning based on reference signal measurements.

[0015] FIG. 5 is a diagram illustrating an example of sidelink communication between devices.

[0016] FIG. 6 is a diagram illustrating an example of a UE with pre-configured downlink (DL) positioning reference signal (PRS) assistance data in accordance with various aspects of the present disclosure.

[0017] FIG. 7 is a diagram illustrating an example of a server configuring a UE with preconfigured DL PRS assistance data in accordance with various aspects of the present disclosure.

[0018] FIG. 8 is a communication flow illustrating an example procedure for pre-configuring a UE with measurement gap(s) for DL PRS measurement(s) in accordance with various aspects of the present disclosure.

[0019] FIG. 9 is a communication flow illustrating an example of providing pre -configured assistance data (AD) to a UE for sidelink (SL) positioning in accordance with various aspects of the present disclosure.

[0020] FIGs. 10A is a diagram illustrating an example pattern of SL PRS resource within a slot in accordance with various aspect of the present disclosure.

[0021] FIGs. 10B is a diagram illustrating an example pattern of SL PRS resource within a slot in accordance with various aspect of the present disclosure.

[0022] FIG. 11 is a flowchart of a method of wireless communication.

[0023] FIG. 12 is a flowchart of a method of wireless communication.

[0024] FIG. 13 is a diagram illustrating an example of a hardware implementation for an example apparatus and / or network entity.DETAILED DESCRIPTION

[0025] Aspects presented herein may improve the overall latency and performance of sidelink (SL) positioning by enabling one or more UEs participating in an SL positioning session to be pre-configured with assistance data (AD) for the SL positioning session. Downlink (DL) positioning reference signal (PRS) assistance data is provided to the UE (before or during an ongoing LTE positioning protocol (LPP) positioning session) for positioning measurements.

[0026] Pre-configured DL PRS AD may include multiple instances, where each instance is applicable to a different area within a network. The preconfigured measurement gap procedure is used by the network to provide measurement gap for NR DL PRS measurements. The gNB may activate / deactivate the preconfigured measurement gap upon receiving the request from a UE or location management function (LMF). Aspects presented herein provide preconfigured DL PRS AD for SL configurations and illustrate various options to provide SL positioning pre-configurations for the SL UE (for example, UE hardcode, positioning system information block (posSIB) transfer, PC5 radio resource control (RRC) transfer, specification defined, etc.). Other aspects include (a) dividing the SL PRS into fixed configuration element or dynamic configuration element, or other combinations; (b) autonomous generation of SL PRS sequence identification (ID); (c) comb compatibility; (d) resource selection update; and (e) single and multiple PRS configurations.

[0027] The detailed description set forth below in connection with the drawings describes various configurations and does not represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

[0028] Several aspects of telecommunication systems are presented with reference to various apparatus and methods. These apparatus and methods are described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements areimplemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0029] By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. When multiple processors are implemented, the multiple processors may perform the functions individually or in combination. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise, shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.

[0030] Accordingly, in one or more example aspects, implementations, and / or use cases, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, such computer-readable media can include a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the types of computer- readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessedby a computer.

[0031] While aspects, implementations, and / or use cases are described in this application by illustration to some examples, additional or different aspects, implementations and / or use cases may come about in many different arrangements and scenarios. Aspects,implementations, and / or use cases described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, aspects, implementations, and / or use cases may come about via integrated chip implementations and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, artificial intelligence (Al)-enabled devices, etc.). While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described examples may occur. Aspects, implementations, and / or use cases may range a spectrum from chip-level or modular components to non-modular, non-chip- level implementations and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more techniques herein. In some practical settings, devices incorporating described aspects and features may also include additional components and features for implementation and practice of claimed and described aspect. For example, transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor(s), interleaver, adders / summers, etc.). Techniques described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc. of varying sizes, shapes, and constitution.

[0032] Deployment of communication systems, such as 5G NR systems, may be arranged in multiple manners with various components or constituent parts. In a 5G NR system, or network, a network node, a network entity, a mobility element of a network, a radio access network (RAN) node, a core network node, a network element, or a network equipment, such as a base station (BS), or one or more units (or one or more components) performing base station functionality, may be implemented in an aggregated or disaggregated architecture. For example, a BS (such as a Node B (NB), evolved NB (eNB), NR BS, 5G NB, access point (AP), a transmission reception point (TRP), or a cell, etc.) may be implemented as an aggregated base station (also known as a standalone BS or a monolithic BS) or a disaggregated base station.

[0033] An aggregated base station may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node. A disaggregated basestation may be configured to utilize a protocol stack that is physically or logically distributed among two or more units (such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs)). In some aspects, a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed throughout one or multiple other RAN nodes. The DUs may be implemented to communicate with one or more RUs. Each of the CU, DU and RU can be implemented as virtual units, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0034] Base station operation or network design may consider aggregation characteristics of base station functionality. For example, disaggregated base stations may be utilized in an integrated access backhaul (IAB) network, an open radio access network (O- RAN (such as the network configuration sponsored by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)). Disaggregation may include distributing functionality across two or more units at various physical locations, as well as distributing functionality for at least one unit virtually, which can enable flexibility in network design. The various units of the disaggregated base station, or disaggregated RAN architecture, can be configured for wired or wireless communication with at least one other unit.

[0035] FIG. 1 is a diagram 100 illustrating an example of a wireless communications system and an access network. The illustrated wireless communications system includes a disaggregated base station architecture. The disaggregated base station architecture may include one or more CUs 110 that can communicate directly with a core network 120 via a backhaul link, or indirectly with the core network 120 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 125 via an E2 link, or a Non-Real Time (Non-RT) RIC 115 associated with a Service Management and Orchestration (SMO) Framework 105, or both). A CU 110 may communicate with one or more DUs 130 via respective midhaul links, such as an Fl interface. The DUs 130 may communicate with one or more RUs 140 via respective fronthaul links. The RUs 140 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, the UE 104 may be simultaneously served by multiple RUs 140.

[0036] Each of the units, i.e., the CUs 110, the DUs 130, the RUs 140, as well as the Near- RT RICs 125, the Non-RT RICs 115, and the SMO Framework 105, may include one or more interfaces or be coupled to one or more interfaces configured to receive or to transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communication interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or to transmit signals over a wired transmission medium to one or more of the other units. Additionally, the units can include a wireless interface, which may include a receiver, a transmitter, or a transceiver (such as an RF transceiver), configured to receive or to transmit signals, or both, over a wireless transmission medium to one or more of the other units.

[0037] In some aspects, the CU 110 may host one or more higher layer control functions. Such control functions can include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 110. The CU 110 may be configured to handle user plane functionality (i.e., Central Unit - User Plane (CU-UP)), control plane functionality (i.e., Central Unit - Control Plane (CU-CP)), or a combination thereof. In some implementations, the CU 110 can be logically split into one or more CU-UP units and one or more CU-CP units. The CU-UP unit can communicate bidirectionally with the CU-CP unit via an interface, such as an El interface when implemented in an 0-RAN configuration. The CU 110 can be implemented to communicate with the DU 130, as necessary, for network control and signaling.

[0038] The DU 130 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 140. In some aspects, the DU 130 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation, demodulation, or the like) depending, at least in part, on a functional split, such as those defined by 3GPP. In some aspects, the DU 130 may further host one or morelow PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 130, or with the control functions hosted by the CU 110.

[0039] Lower-layer functionality can be implemented by one or more RUs 140. In some deployments, an RU 140, controlled by a DU 130, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like), or both, based at least in part on the functional split, such as a lower layer functional split. In such an architecture, the RU(s) 140 can be implemented to handle over the air (OTA) communication with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control and user plane communication with the RU(s) 140 can be controlled by the corresponding DU 130. In some scenarios, this configuration can enable the DU(s) 130 and the CU 110 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0040] The SMO Framework 105 may be configured to support RAN deployment and provisioning of non- virtualized and virtualized network elements. For non- virtualized network elements, the SMO Framework 105 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements that may be managed via an operations and maintenance interface (such as an 01 interface). For virtualized network elements, the SMO Framework 105 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 190) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an 02 interface). Such virtualized network elements can include, but are not limited to, CUs 110, DUs 130, RUs 140 andNear-RT RICs 125. In some implementations, the SMO Framework 105 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O- eNB) 111, via an 01 interface. Additionally, in some implementations, the SMO Framework 105 can communicate directly with one or more RUs 140 via an 01 interface. The SMO Framework 105 also may include aNon-RT RIC 115 configured to support functionality of the SMO Framework 105.

[0041] The Non-RT RIC 115 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, artificialintelligence (Al) / machine learning (ML) (AI / ML) workflows including model training and updates, or policy-based guidance of applications / features in the Near- RT RIC 125. The Non-RT RIC 115 may be coupled to or communicate with (such as via an Al interface) the Near-RT RIC 125. The Near-RT RIC 125 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 110, one or more DUs 130, or both, as well as an O-eNB, with the Near-RT RIC 125.

[0042] In some implementations, to generate AI / ML models to be deployed in the Near-RT RIC 125, the Non-RT RIC 115 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 125 and may be received at the SMO Framework 105 or the Non-RT RIC 115 from non-network data sources or from network functions. In some examples, the Non-RT RIC 115 or the Near-RT RIC 125 may be configured to tune RAN behavior or performance. For example, the Non-RT RIC 115 may monitor long-term trends and patterns for performance and employ AI / ML models to perform corrective actions through the SMO Framework 105 (such as reconfiguration via 01) or via creation of RAN management policies (such as Al policies).

[0043] At least one of the CU 110, the DU 130, and the RU 140 may be referred to as a base station 102. Accordingly, a base station 102 may include one or more of the CU 110, the DU 130, and the RU 140 (each component indicated with dotted lines to signify that each component may or may not be included in the base station 102). The base station 102 provides an access point to the core network 120 for a UE 104. The base station 102 may include macrocells (high power cellular base station) and / or small cells (low power cellular base station). The small cells include femtocells, picocells, and microcells. A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG). The communication links between the RUs 140 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to an RU 140 and / or downlink (DL) (also referred to as forward link) transmissions from an RU 140 to a UE 104. The communication links may use multiple- input and multiple-output (MIMO) antenna technology, includingspatial multiplexing, beamforming, and / or transmit diversity. The communication links may be through one or more carriers. The base station 102 / UEs 104 may use spectrum up to X MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Fx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respectto DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell).

[0044] Certain UEs 104 may communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL / UL wireless wide area network (WWAN) spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (P SB CH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be through a variety of wireless D2D communications systems, such as for example, Bluetooth™ (Bluetooth is a trademark of the Bluetooth Special Interest Group (SIG)), Wi-Fi™ (is a trademark of the Wi-Fi Alliance) based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0045] The wireless communications system may further include a Wi-Fi AP 150 in communication with UEs 104 (also referred to as Wi-Fi stations (STAs)) via communication link 154, e.g., in a 5 GHz unlicensed frequency spectrum or the like. When communicating in an unlicensed frequency spectrum, the UEs 104 / AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.

[0046] The electromagnetic spectrum is often subdivided, based on frequency / wavelength, into various classes, bands, channels, etc. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referredto (interchangeably) as a “millimeter wave” band in documentsand articles, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

[0047] The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified an operating band for these mid-band frequencies as frequency range designation FR3 (7.125 GHz - 24.25 GHz). Frequency bands falling within FR3 may inherit FR1 characteristics and / or FR2 characteristics, and thus may effectively extend features of FR1 and / or FR2 into midband frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency range designations FR2-2 (52.6 GHz - 71 GHz), FR4 (71 GHz - 114.25 GHz), and FR5 (114.25 GHz - 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0048] With the above aspects in mind, unless specifically stated otherwise, the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR2-2, and / or FR5, or may be within the EHF band.

[0049] The base station 102 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate beamforming. The base station 102 may transmit a beamformed signal 182 to the UE 104 in one or more transmit directions. The UE 104 may receive the beamformed signal from the base station 102 in one or more receive directions. The UE 104 may also transmit a beamformed signal 184 to the base station 102 in one or more transmit directions. The base station 102 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 102 / UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 102 / UE 104. The transmit and receive directions for the base station 102 may or may not be the same. The transmit and receive directions for the UE 104 may or may not be the same.

[0050] The base station 102 may include and / or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, atransceiver function, a basic service set (BSS), an extended service set (ESS), a TRP, network node, network entity, network equipment, or some other suitable terminology. The base station 102 can be implemented as an integrated access and backhaul (IAB) node, a relay node, a sidelink node, an aggregated (monolithic) base station with a baseband unit (BBU) (including a CU and a DU) and an RU, or as a disaggregated base station including one or more of a CU, a DU, and / or an RU. The set of base stations, which may include disaggregated base stations and / or aggregated base stations, may be referred to as next generation (NG) RAN (NG-RAN).

[0051] The core network 120 may include an Access and Mobility Management Function (AMF) 161, a Session Management Function (SMF) 162, a User Plane Function (UPF) 163, a Unified Data Management (UDM) 164, one or more location servers 168, and other functional entities. The AMF 161 is the control node that processes the signaling between the UEs 104 and the core network 120. The AMF 161 supports registration management, connection management, mobility management, and other functions. The SMF 162 supports session management and other functions. The UPF 163 supports packet routing, packet forwarding, and other functions. The UDM 164 supports the generation of authentication and key agreement (AKA) credentials, user identification handling, access authorization, and subscription management. The one or more location servers 168 are illustrated as including a Gateway Mobile Location Center (GMLC) 165 and a Location Management Function (LMF) 166. However, generally, the one or more location servers 168 may include one or more location / positioning servers, which may include one or more of the GMLC 165, the LMF 166, a position determination entity (PDE), a serving mobile location center (SMLC), a mobile positioning center (MPC), or the like. The GMLC 165 and the LMF 166 support UE location services. The GMLC 165 provides an interface for clients / applications (e.g., emergency services) for accessing UE positioning information. The LMF 166 receives measurements and assistance information from the NG-RAN and the UE 104 via the AMF 161 to compute the position of the UE 104. The NG-RAN may utilize one or more positioning methods in order to determine the position of the UE 104. Positioning the UE 104 may involve signal measurements, a position estimate, and an optional velocity computation based on the measurements. The signal measurements may be made by the UE 104 and / or the base station 102 serving the UE 104. The signals measured may be based on one or more of a satellitepositioning system (SPS) 170 (e.g., one or more of a Global Navigation Satellite System (GNSS), global position system (GPS), non-terrestrial network (NTN), or other satellite position / location system), LTE signals, wireless local area network (WLAN) signals, Bluetooth signals, a terrestrial beacon system (TBS), sensor-based information (e.g., barometric pressure sensor, motion sensor), NR enhanced cell ID (NR E-CID) methods, NR signals (e.g., multi-round trip time (Multi-RTT), DL angle- of-departure (DL-AoD), DL time difference of arrival (DL-TDOA), UL time difference of arrival (UL-TDOA), and UL angle-of-arrival (UL-AoA) positioning), and / or other systems / signals / sensors.

[0052] Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, or any other similar functioning device. Some of the UEs 104 may be referred to as loT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.). The UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. In some scenarios, the term UE may also apply to one or more companion devices such as in a device constellation arrangement. One or more of these devices may collectively access the network and / or individually access the network.

[0053] Referring again to FIG. 1, in certain aspects, the UE 104 may have a pre-configured assistance data application component 198 that may be configured to obtain an AD configuration associated with an SL positioning session, where the AD configuration includes multiple sets of AD; participate in the SL positioning session with at least one second UE; and apply at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area ID associated with the location of the first UE. In certain aspects, the base station 102 or the one or more location servers 168 may have an assistance data configurationcomponent 199 that may be configured to provide assistance data (preconfiguration^) related to SL positioning for the UE 104.

[0054] FIG. 2 A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure. FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure. FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be frequency division duplexed (FDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for either DL or UL, or may be time division duplexed (TDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for both DL and UL. In the examples provided by FIGs. 2A, 2C, the 5G NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL), where D is DL, U is UL, and F is flexible for use between DL / UL, and subframe 3 being configured with slot format 1 (with all UL). While subframes 3, 4 are shown with slot formats 1, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. UEs are configured with the slot format (dynamically through DL control information (DCI), or semi- statically / statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI). Note that the description infra applies also to a 5G NR frame structure that is TDD.

[0055] FIGs. 2A-2D illustrate a frame structure, and the aspects of the present disclosure may be applicable to other wireless communication technologies, which may have a different frame structure and / or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 14 or 12 symbols, depending on whether the cyclic prefix (CP) is normal or extended. For normal CP, each slot may include 14 symbols, and for extended CP, each slot may include 12 symbols. The symbols on DL may be CP orthogonal frequency division multiplexing (OFDM) (CP -OFDM) symbols. The symbols on UL may be CP-OFDM symbols (for high throughput scenarios) ordiscrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (for power limited scenarios; limited to a single stream transmission). The number of slots within a subframe is based on the CP and the numerology. The numerology defines the subcarrier spacing (SCS) (see Table 1). The symbol length / duration may scale with 1 / SCS.Table 1: Numerology, SCS, and CP

[0056] For normal CP (14 symbols / slot), different numerologies p 0 to 4 allow for 1, 2, 4, 8, and 16 slots, respectively, per subframe. For extended CP, the numerology 2 allows for 4 slots per subframe. Accordingly, for normal CP and numerology p, there are 14 symbols / slot and 2.Llslots / subframe. The subcarrier spacing may be equal to 2^ * 15 kHz , where g is the numerology 0 to 4. As such, the numerology p=0 has a subcarrier spacing of 15 kHz and the numerology p=4 has a subcarrier spacing of 240 kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIGs. 2A-2D provide an example of normal CP with 14 symbols per slot and numerology p=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 ps. Within a set of frames, there may be one or more different bandwidth parts (BWPs) (see FIG. 2B) that are frequency division multiplexed. Each BWP may have a particular numerology and CP (normal or extended).

[0057] A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0058] As illustrated in FIG. 2A, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).

[0059] FIG. 2B illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including six RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. A PDCCH within one BWP may be referred to as a control resource set (CORESET). A UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., common search space, UE-specific search space) during PDCCH monitoring occasions on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at greater and / or lower frequencies across the channel bandwidth. A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe / symbol timing and a physical layer identity. A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of the DM-RS. The physical broadcast channel (PBCH), which carries a master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as SS block (SSB)). The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs), and paging messages.

[0060] As illustrated in FIG. 2C, some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit DM-RS for the physical uplinkcontrol channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. The UE may transmit sounding reference signals (SRS). The SRS may be transmitted in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequencydependent scheduling on the UL.

[0061] FIG. 2D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and hybrid automatic repeat request (HARQ) acknowledgment (ACK) (HARQ-ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACK and / or negative ACK (NACK)). The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0062] FIG. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, Internet protocol (IP) packets may be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units(SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0063] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding / decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation / demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BP SK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and / or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and / or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318Tx. Each transmitter 318Tx may modulate a radio frequency (RF) carrier with a respective spatial stream for transmission.

[0064] At the UE 350, each receiver 354Rx receives a signal through its respective antenna 352. Each receiver 354Rx recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RXprocessor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller / processor 359, which implements layer 3 and layer 2 functionality.

[0065] The controller / processor 359 can be associated with at least one memory 360 that stores program codes and data. The at least one memory 360 may be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets. The controller / processor 359 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0066] Similar to the functionality described in connection with the DL transmission by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer ofupper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0067] Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatialprocessing. The spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354Tx. Each transmitter 354Tx may modulate anRF carrier with a respective spatial stream for transmission.

[0068] The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350. Each receiver 318Rx receives a signal through its respective antenna 320. Each receiver 318Rx recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

[0069] The controller / processor 375 can be associated with at least one memory 376 that stores program codes and data. The at least one memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets. The controller / processor 375 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0070] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform aspects in connection with the pre -configured assistance data application component 198 of FIG. 1.

[0071] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to perform aspects in connection with the assistance data configuration component 199 of FIG. 1.

[0072] FIG. 4 is a diagram 400 illustrating an example of aUE positioning based on reference signal measurements (which may also be referred to as “network-based positioning”) in accordance with various aspects of the present disclosure. The UE 404 may transmit UL SRS 412 at time TSRS_TX and receive DL positioning reference signals (PRS) (DL PRS) 410 at time TPRSRX- The TRP 406 may receive the UL SRS 412 at time TSRS_RX and transmit the DL PRS 410 at time TPRS_TX- The UE 404 may receive the DL PRS 410 before transmitting the UL SRS 412, or may transmit the UL SRS 412 before receiving the DL PRS 410. In both cases, a positioning server (e.g., location server(s) 168) or the UE 404 may determine the RTT 414 based on ||TSRS RX - TPRSTX| - ITSRS TX - TPRS_RX||- Accordingly, multi-RTT positioning may make use of the UE Rx-Tx time difference measurements (i.e., |TSRS TX - TPRS_RX|) and DL PRS reference signal received power (RSRP) (DL PRS-RSRP) of downlink signals received frommultiple TRPs 402, 406 and measured by the UE 404, and the measured TRP Rx-Tx time difference measurements (i.e., |TSRS_RX - TPRSTX|) and UL SRS-RSRP at multiple TRPs 402, 406 of uplink signals transmitted from UE 404. The UE 404 measures the UE Rx-Tx time difference measurements (and / or DL PRS-RSRP of the received signals) using assistance data received from the positioning server, and the TRPs 402, 406 measure the gNB Rx-Tx time difference measurements (and / or UL SRS-RSRP of the received signals) using assistance data received from the positioning server. The measurements may be used at the positioning server or the UE 404 to determine the RTT, which is used to estimate the location of the UE 404. Other methods are possible for determining the RTT, such as for example using DL-TDOA and / or UL-TDOA measurements.

[0073] PRSs may be defined for network-based positioning (e.g., NR positioning) to enable UEs to detect and measure more neighbor transmission and reception points (TRPs), where multiple configurations are supported to enable a variety of deployments (e.g., indoor, outdoor, sub-6, mmW, etc.). To support PRS beam operation, beam sweeping may also be configured for PRS. The UL positioning reference signal may be based on sounding reference signals (SRSs) with enhancements / adjustments for positioning purposes. In some examples, UL-PRS may be referred to as “SRS for positioning,” and a new Information Element (IE) may be configured for SRS for positioning in RRC signaling.

[0074] DL PRS-RSRP may be defined as the linear average over the power contributions (in [W]) of the resource elements of the antenna port(s) that carry DL PRS reference signals configured for RSRP measurements within the considered measurement frequency bandwidth. In some examples, for FR1, the reference point for the DL PRS- RSRP may be the antenna connector of the UE. For FR2, DL PRS-RSRP may be measured based on the combined signal from antenna elements corresponding to a given receiver branch. For FR1 and FR2, if receiver diversity is in use by the UE, the reported DL PRS-RSRP value may not be lower than the corresponding DL PRS- RSRP of any of the individual receiver branches. Similarly, UL SRS-RSRP may be defined as linear average of the power contributions (in [W]) of the resource elements carrying sounding reference signals (SRS). UL SRS-RSRP may be measured over the configured resource elements within the considered measurement frequency bandwidth in the configured measurement time occasions. In some examples, forFR1, the reference point for the UL SRS-RSRP may be the antenna connector of the base station (e.g., gNB). For FR2, UL SRS-RSRP may be measured based on the combined signal from antenna elements corresponding to a given receiver branch. For FR1 and FR2, if receiver diversity is in use by the base station, the reported UL SRS- RSRP value may not be lower than the corresponding UL SRS-RSRP of any of the individual receiver branches.

[0075] PRS-path RSRP (PRS-RSRPP) may be defined as the power of the linear average of the channel response at the i-th path delay of the resource elements that carry DL PRS signal configured for the measurement, where DL PRS-RSRPP for the 1st path delay is the power contribution corresponding to the first detected path in time. In some examples, PRS path Phase measurement may refer to the phase associated with an i- th path of the channel derived using a PRS resource.

[0076] DL-AoD positioning may make use of the measured DL PRS-RSRP of downlink signals received from multiple TRPs 402, 406 at the UE 404. The UE 404 measures the DL PRS-RSRP of the received signals using assistance data received from the positioning server, and the resulting measurements are used along with the azimuth angle of departure (A-AoD), the zenith angle of departure (Z-AoD), and other configuration information to locate the UE 404 in relation to the neighboring TRPs 402, 406.

[0077] DL-TDOA positioning may make use of the DL reference signal time difference (RSTD) (and / or DL PRS-RSRP) of downlink signals received from multiple TRPs 402, 406 at the UE 404. The UE 404 measures the DL RSTD (and / or DL PRS-RSRP) of the received signals using assistance data received from the positioning server, and the resulting measurements are used along with other configuration information to locate the UE 404 in relation to the neighboring TRPs 402, 406.

[0078] UL-TDOA positioning may make use of the UL relative time of arrival (RTOA) (and / or UL SRS-RSRP) at multiple TRPs 402, 406 of uplink signals transmitted from UE 404. The TRPs 402, 406 measure the UL-RTOA (and / or UL SRS-RSRP) of the received signals using assistance data received from the positioning server, and the resulting measurements are used along with other configuration information to estimate the location of the UE 404.

[0079] UL-AoA positioning may make use of the measured azimuth angle of arrival (A-AoA) and zenith angle of arrival (Z-AoA) at multiple TRPs 402, 406 of uplink signalstransmitted from the UE 404. The TRPs 402, 406 measure the A-AoA and the Z-AoA of the received signals using assistance data received from the positioning server, and the resulting measurements are used along with other configuration information to estimate the location of the UE 404. For purposes of the present disclosure, a positioning operation in which measurements are provided by a UE to a base station / positioning entity / server to be used in the computation of the UE’s position may be described as “UE-assisted,” “UE-assisted positioning,” and / or “UE-assisted position calculation,” while a positioning operation in which a UE measures and computes its own position may be described as“UE-based,” “UE-based positioning,” and / or “UE-based position calculation.”

[0080] Additional positioning methods may be used for estimating the location of the UE 404, such as for example, UE-side UL-AoD and / or DL-AoA. Note that data / measurements from various technologies may be combined in various ways to increase accuracy, to determine and / or to enhance certainty, to supplement / complement measurements, and / or to substitute / provide for missing information.

[0081] Note that the terms “positioning reference signal” and “PRS” generally refer to specific reference signals that are used for positioning in NR and LTE systems. However, as used herein, the terms “positioning reference signal” and “PRS” may also refer to any type of reference signal that can be used for positioning, such as but not limited to, PRS as defined in LTE and NR, TRS, PTRS, CRS, CSLRS, DMRS, PSS, SSS, SSB, SRS, UL-PRS, etc. In addition, the terms “positioning reference signal” and “PRS” may refer to downlink or uplink positioning reference signals, unless otherwise indicated by the context. To further distinguish the type of PRS, a downlink positioning reference signal may be referred to as a “DL PRS,” and an uplink positioning reference signal (e.g., an SRS-for-positioning, PTRS) may be referred to as an “UL-PRS.” In addition, for signals that may be transmitted in both the uplink and downlink (e.g., DMRS, PTRS), the signals may be prepended with “UL” or “DL” to distinguish the direction. For example, “UL-DMRS” may be differentiated from “DL-DMRS.” In addition, the term “location” and “position” may be used interchangeably throughout the specification, which may refer to a particular geographical or a relative place.

[0082] FIG. 5 illustrates an example 500 of sidelink communication between devices. The communication may be based on a slot structure similar to aspects described in connection with FIGs. 2A to 2D. For example, a UE 502 may transmit a sidelink (SL) transmission 514, e.g., including a control channel (e.g., a physical sidelink control channel (PSCCH)) and / or a corresponding data channel (e.g., a physical sidelink shared channel (PSSCH)), that may be received by UEs 504, 506, and 508. A control channel may include information (e.g., sidelink control information (SCI)) for decoding a data channel including reservation information, such as information about time and / or frequency resources that are reserved for the data channel transmission. For example, the SCI may indicate a number of transmission time intervals (TTIs), as well as the resource blocks (RBs) that may be occupied by the data transmission. The SCI may be used by receiving devices to avoid interference by refraining from transmitting on the reserved resources. The UEs 502, 504, 506, and 508 may each be capable of sidelink transmission in addition to sidelink reception. Thus, UEs 504, 506, and 508 are illustrated as transmitting sidelink transmissions 513, 515, 516, and 520. The sidelink transmissions 513, 514, 515, 516, and 520 may be unicast, broadcast, or multicast to nearby devices. For example, UE504 may transmit sidelink transmissions 513 and 515 intended for receipt by other UEs within a range 501 of UE 504, and UE 506 may transmit sidelink transmission 516 to a specified UE. Additionally, or alternatively, a roadside unit (RSU) 507 may be configured to receive communication from and / or transmit communication 518 to UEs 502, 504, 506, and 508.

[0083] Sidelink communication may be based on one or more transmission modes. In one transmission mode for a first radio access technologies (RAT) (which may be referred to herein as "Mode 4" of a first RAT), a wireless device may autonomously select resources for transmission. A network entity may allocate one or more sub-channels for wireless devices to transmit one or more transport blocks (TB) using the one or more channels. A wireless device may randomly reserve an allocated resource for one-shot transmissions. A wireless device may use a sensing-based semi-persistent transmission scheme, or semi-persistent scheduling (SPS) mode, to select a reserved resource for transmission. For example, before selecting a resource for data transmission, a wireless device may first determine whether resources have been reserved by another wireless device. Semi-persistent transmission allows a wireless device to take advantage of semi-periodic traffic arrival by using historicalinterference patterns to predict future interference patterns. The wireless device may sense at least one of priority information, energy sensing information, or PSCCH decoding information to optimize resource selection. In one aspect, a wireless device may avoid selecting resources for a transmission that are scheduled to be used for a higher priority packet transmission. In another aspect, a wireless device may rank resources according to how much energy is received, and may pick the lowest energy resources. In another aspect, a wireless device may avoid resources for whom control is decoded or for which the received energy may be above a threshold.

[0084] A network entity may configure the periodicity of the reserved sub-channels using DCI transmitted over a PDCCH. The period of a semi-persistent transmission resource may be, for example, 20, 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, or 1000 milliseconds (ms). Such a periodicity may be referred to as a resource reservation period (RSVP). In alternative embodiments, the periodicity may be referred to as a resource reservation interval (RRI). A network entity may limit the possible values for the periodicity of the transmission resource. A wireless device, such as a UE, may select a transmission resource based on the periodicity of an arrival packet. A counter may be used to trigger periodic reselections. For example, a wireless device may randomly select a counter between 5 and 15, and may reserve a resource based on the counter (e.g., 10 * counter resource reservation periods, a number of medium access control (MAC) protocol data unit (PDU) transmissions equal to the counter). After every transmission, or after a reservation period passes, the counter may be decremented until it hits zero. For example, where a reservation period is 100 ms and a counter is 10, every 100 ms the counter may decrement until one second (s) passes, upon which the wireless device may then reselect a sidelink resource. In one aspect, the wireless device may reselect the sidelink resource based on a re-selection probability value. For example, in response to the counter decrementing to zero, the wireless device may reselect the sidelink resource an x% of the time, and may not reselect the sidelink resource (1-x) % of the time, where x < 1. The wireless device may then resetthe counter and repeat the process when the counter decrements to zero again. A wireless device may measure a received signal strength indicator (RSSI) measurement for each slot of 100 ms, and may then calculate the RSSI of the frequency band resource as an average of each of the 10 RSSI measurements taken over the period of one second. A wireless device may select a suitable frequency bandresource as a resource that is in one of the bottom 20% of ranked RSSI calculated resources for a wireless device. In some aspects, the counter may be decremented after every MAC PDU transmission. A wireless device may be configured to reselect a sidelink resource after a counter expires (i.e., reaches zero), and a MAC PDU is received.

[0085] Sidelink communication for other RATs may be based on different types or modes of resource allocation mechanisms. In another resource allocation mode for a second RAT (which may be referred to herein as "Mode 1" of a second RAT), centralized resource allocation may be provided by a network entity. For example, a network entity may determine resources for sidelink communication and may allocate resources to different wireless devices to use for sidelink transmissions. In this first mode, a wireless device may receive an allocation of sidelink resources from a base station or a network entity. In a second resource allocation mode (which may be referred to herein as "Mode 2"), distributed resource allocation may be provided. In Mode 2, each wireless device may autonomously determine resources to use for sidelink transmission. In order to coordinate the selection of sidelink resources by individual wireless devices, each wireless device may use a sensing technique to monitor for resource reservations by other sidelink wireless devices and may select resources for sidelink transmissions from unreserved resources. Devices communicating based on sidelink, may determine one or more radio resources in the time and frequency domain that are used by other devices in order to select transmission resources that avoid collisions with other devices.

[0086] The sidelink transmission and / or the resource reservation may be periodic or aperiodic, where a wireless device may reserve resources for transmission in a current slot and up to two future slots (discussed below). Thus, in the second mode (e.g., Mode 2), individual wireless devices may autonomously select resources for sidelink transmission, e.g., without a central entity such as a base station indicating the resources for the device. A first wireless device may reserve the selected resources in order to inform other wireless devices about the resources that the first wireless device intends to use for sidelink transmission(s).

[0087] In some examples, the resource selection for sidelink communication may be based on a sensing-based mechanism. For instance, before selecting a resource for a data transmission, a wireless device may previously determine whether resources havebeen reserved by other wireless devices. For example, as part of a sensing mechanism for a resource allocation mode 2 of a second RAT, a wireless device may determine (e.g., sense) whether a selected sidelink resource has been reserved by other wireless device(s) before selecting a sidelink resource for a data transmission. If the wireless device determines that the sidelink resource has not been reserved by other wireless devices, the wireless device may use the selected sidelink resource for transmitting the data, e.g., in a PSSCH transmission. The wireless device may estimate or determine which radio resources (e.g., sidelink resources) may be in-use and / or reserved by others by detecting and decoding SCI transmitted by other wireless devices. The wireless device may use a sensing-based resource selection algorithm to estimate or determine which radio resources are in-use and / or reserved by others. The wireless device may receive SCI from another wireless device that may include reservation information based on a resource reservation field in the SCI. The wireless device may continuously monitor for (e.g., sense) and decode SCI from peer wireless devices. The SCI may include reservation information, e.g., indicating slots and RBs that a particular wireless device has selected for a future transmission. The wireless device may exclude resources that are used and / or reserved by other wireless devices from a set of candidate resources for sidelink transmission by the wireless device, and the wireless device may select / reserve resources for a sidelink transmission from the resources that are unused and therefore form the set of candidate resources. A wireless device may continuously perform sensing for SCI with resource reservations in order to maintain a set of candidate resources from which the wireless device may select one or more resources for a sidelink transmission. Once the wireless device selects a candidate resource, the wireless device may transmit SCI indicating its own reservation of the resource for a sidelink transmission. The number of resources (e.g., sub-channels per subframe) reserved by the wireless device may depend on the size of data to be transmitted by the wireless device. Although the example is described for a wireless device receiving reservations from another wireless device, the reservations may be received from an RSU or other device communicating based on sidelink.

[0088] In some examples, communications from a vehicle to one or more entities within a range of the vehicle (typically via sidelink (SL) or a mobile network) may be referred to as a vehicle-to-everything (V2X) or cellular vehicle-to-everything (C-V2X)communication or technology. For example, V2X / C-V2X communication or technology may include sensors, cameras, and / or wireless connectivity that enable vehicles (e.g., UEs 502, 504, 506, 508, etc.) to share real-time information with their drivers, other vehicles, cyclists, pedestrians, vulnerable road users (VRUs), mobile networks, and / or roadway infrastructure like roadside units (RSUs) and traffic lights, etc. In addition, C-V2X may utilize available networks (e.g., PC5 channel(s)) to establish direct and / or indirect communication links, allowing vehicles to exchange information in real-time. In some implementations, C-V2X may operate in two modes: a vehicle-to-vehicle (V2V) mode and a vehicle-to-infrastructure (V2I). In the V2V mode, vehicles may communicate with each other, sharing data such as position, speed, acceleration, and other relevant information. This may enable cooperative driving, collision avoidance, and traffic efficiency improvements.

[0089] In some implementations, a UE may be pre -configured with a set of positioning reference signals (PRS) via assistance data (AD), which may be called as “preconfigured DL PRS assistance data” or “pre-configured PRS assistance data.” Preconfigured DL PRS assistance data may be provided to or configured for a UE (before or during an ongoing positioning session), and then utilized by the UE for potential positioning measurement(s) at a future time (e.g., for a deferred mobile terminating location request (MT-LR)).

[0090] Pre-configured DL PRS assistance data may consist of multiple instances / configurations, where each instance / configuration may be applicable to a different area within the network. For example, eachDL PRS assistance data instance may be associated with an area identification / identifier (ID), where the area ID may include a list of cells where the UE may be camped on / connected. In some implementations, an applicable area ID at a UE location may be selected based on the cell where the UE is camped on / connected. Then, an instance of the assistance data may become valid / selected if the UE is camped on / connected to one of cells indicated within the list of cells in the area ID.

[0091] FIG. 6 is a diagram 600 illustrating an example of a UE with pre-configured DL PRS assistance data in accordance with various aspects of the present disclosure. In one aspect, pre-configured DL PRS assistance data may consist of multiple PRS configurations, where each PRS configuration may be applicable to a different area within the network. For example, under the concept of PRS validity area, a UE mayuse / apply a PRS configuration within area validity of an area ID, where the area ID may consist of one or more cells.

[0092] For example, as shown at 604, afirst set of transmission reception points (TRPs)(e.g., TRPs #1, 2, and 3) may be associated with a first area ID (Area ID #1); as shown at 606, a second set of TRPs (e.g., TRPs #3, 4, 5, 6, and 9) may be associated with a second area ID (Area ID #2); as shown at 608, a third set of TRPs (e.g., TRPs #7 and 8) may be associated with a third area ID (Area ID #3); and as shown at 610, a fourth set of TRPs (e.g., TRPs #9, 10, and 11) may be associated with a fourth area ID (Area ID #4), etc. In one example, if a UE 602 is pre-configured with a set of PRS configurations (e.g., via the pre-configured DL PRS assistance data), the UE 602 may be specified to apply different PRS configurations based on the area ID associated with the current location of the UE 602. For example, when the UE 602 is within the area associated with the first area ID, the UE 602 may apply a PRS configuration that corresponds to the first area ID, such as receiving / measuring a set of PRSs from TRP(s) #1, 2, and / or 3 using specified time resources, frequency resources, periodicity, and / or bandwidth, etc. Similarly, when the UE 602 is within the area associated with the fourth area ID, the UE 602 may apply another PRS configuration that corresponds to the fourth area ID, such as receiving / measuring a set of PRSs from TRP(s) #9, 10, and / or 11 using specified time resources, frequency resources, periodicity, and / or bandwidth, etc. As such, the PRS configuration associated with each area ID may be different.

[0093] FIG. 7 is a diagram 700 illustrating an example of a server configuring a UE with preconfigured DL PRS assistance data in accordance with various aspects of the present disclosure. As shown at 710, a server 704 (e.g., a location server, a location management function (LMF), etc.) may provide one or more assistance data instances / configurations to a UE 702 in one or more assistance data messages (e.g., via LTE Positioning Protocol (LPP) assistance data messages). If the UE 702 receives assistance data for a TRP for which it has already stored assistance data, the UE 702 may be configured to overwrite the stored assistance data. On the other hand, if the UE 702 receives assistance data for a TRP for which it has not stored assistance data, the UE 702 may be configured to maintain its stored assistance data for other TRPs. The number of TRPs for which the UE 702 may store the assistance data may berelated to a UE capability, which the UE 702 may indicate (e.g., to the server 704) the number of area IDs that may be supported by the UE 702.

[0094] FIG. 8 is a communication flow 800 illustrating an example procedure for preconfiguring a UE with measurement gap(s) for DL PRS measurement(s) in accordance with various aspects of the present disclosure. The numberings associated with the communication flow 800 do not specify a particular temporal order and are merely used as references for the communication flow 800. In some implementations, a server (e.g., a network, a location server, an LMF, etc.) may use a pre-configured measurement gap procedure to provide / configure measurement gap(s) for DL PRS measurements to a UE. Then, a base station (e.g., a gNB) may activate / deactivate the pre-configured measurement gap for the UE after receiving a request from the UE or the server.

[0095] At 810, a server 804 (e.g., a network, a location server, an LMF, etc.) may provide PRS information of a set of neighbor TRPs to a base station 806 (e.g., a serving base station, a server gNB, etc.), and request the base station 806 to pre-configure measurement gap for a UE 802. In some implementations, the server 804 may provide the PRS information and / or the request via an NR Positioning Protocol A (NRPPa) measurement preconfiguration message.

[0096] At 812, based on the UE capability of the UE 802, the base station 806 may provide pre -configured measurement gap configuration(s) with associated ID(s) to the UE 802, such as via a radio resource control (RRC) reconfiguration message. In response, at 814, the UE 802 may provide a confirmation message to the base station 806 (e.g., via an RRC reconfiguration complete message) after the UE 802 receives the preconfigured measurement gap configuration(s).

[0097] At 816, the base station 806 may send a confirmation message to the server804 to indicate the success / completion of the pre-conflguration (e.g., the measurement gap pre-conflguration(s)). The base station 806 may send the confirmation via an NRPPa measurement preconfiguration confirm message.

[0098] At 818, if the UE 802 specifies measurement gap(s) for performing requested location measurement(s), the UE 802 may send a measurement gap activation / deactivation request (e.g., via an UL MAC CE positioning measurement gap activation / deactivation request message) to the base station 806, and indicate to thebase station 806 the requested measurement gap configuration based on the ID configured at 812.

[0099] At 820, the server 804 may send a request to the base station 806 to request for the measurement gap activation, where the server may send the request via an NRPPa measurement activation message.

[0100] At 822, based on the request from the UE 802 at 818 and / or the request from the server 804 at 820, the base station 806 may send a measurement gap activation / deactivation message containing the ID to the UE 802. For example, the base station 806 may send a DL MAC CE positioning measurement gap activation / deactivation containing an ID to (de)activate the associated measurement gap.

[0101] In some implementations, positioning assistance data (AD) may include various parameters related to sidelink (SL) positioning resources. For example, these parameters may include the bandwidth (BW) of resource blocks (RBs), the number of RBs, the comb / symbol option(s), frequency and time position within a slot for each PRS resource, and / or sequence (e.g., Gold sequence) for PRS generation based on the scrambling ID, etc. When a target UE (e.g., a UE whose position is to be determined) is configured to perform SL positioning under SL Mode 1 and / or Mode 2 (e.g., as described in connection with FIG. 5) with other UEs (e.g., or other SL devices), an anchor UE may be specified to provide its AD or information related to its SL positioning resources to other UEs participating in the SL positioning. For purposes of the present disclosure, in the context of positioning, an “anchor” may refer to an entity (e.g., a TRP, a base station, a UE, an access point (AP), a fixed object / infrastructure, a point of reference, etc.) that is used as a reference point for determining the position of a UE (e.g., a target whose position is to be determined) in relation to the entity. For example, the TRPs 402 and 406 may be referred to as “anchors” or “anchor TRPs” for the positioning of the UE 404. Similarly, other UEs that are used to assist the positioning of a UE (e.g., based on SL communication) may be referred to as “anchors” or “anchor UEs,” etc. However, negotiating and / or exchanging of AD between UEs on the fly may be very time consuming, and may increase the complexity of the SL positioning.

[0102] Aspects presented herein may improve the overall latency and performance of SL positioning by enabling a UE (and other sidelink UEs / devices) to be (pre-)configured with assistance data (AD) for the sidelink positioning. The (pre-)configured AD forsidelink positioning may provide lesser configuration(s) at the UE level, and thereby making the UE implementation easier compared to specifying the UEs to exchange AD on the fly.

[0103] FIG. 9 is a communication flow 900 illustrating an example of providing preconfigured AD to a UE for SL positioning in accordance with various aspects of the present disclosure. The numberings associated with the communication flow 900 do not specify a particular temporal order and are merely used as references for the communication flow 900. For purposes of the present disclosure, SL positioning may refer to positioning of a UE (or a sidelink device) based on SL communications (e.g., without communicating via a network entity such as a base station). For example, SL positioning may be performed by a group of UEs as shown by FIG. 5. A SL positioning session may refer to an instance / session / activity in which a group of UEs is configured to participate in the positioning of a target UE. The group of UEs may include the target UE and one or more anchor UEs, where the target UE (or a positioning server) may be responsible for estimating the position of the target UE based on SL positioning measurements (e.g., measuring SL reference signals, which may also be refer to as PRS or SL PRS) and the one or more anchor UEs may be responsible for transmission and / or reception of SL reference signals (to and / or from the target UE).

[0104] At 910, a first UE 902 participating in a positioning session (e.g., as an anchor UE or as a target UE whose position is to be determined depending on the context) may obtain an AD configuration 908 associated with the SL positioning session (which may be referred to as the “pre-configured AD for SL positioning” for purposes of the present disclosure. This AD configuration 908 may include multiple sets of AD (e.g., multiple / different pre-configured AD that may be applied at different areas or with different UEs, etc.).

[0105] In one example, the AD configuration 908 may be hardcoded in the first UE 902, such as being part of operator configuration(s) (e.g., Subscriber Identity / Identification Module (SIM) parameter(s)). Thus, different operators may have different AD configurations (e.g., different pre-configured AD for SL positioning). Then, depending on the user-operator plan / agreement, different configurations / capabilities may be enabled on the UE side by the operator.

[0106] In another example, as shown at 912, the first UE 902 may obtain the AD configuration 908 via a positioning (pos) system information block (SIB) (posSIB) (e.g., from a base station such as a serving base station via Uu link). In some network implementations, as there may be defined pos SIB s for pre-configured AD in the Uu link, this posSIB transfer procedure may also be used by a network 906 to provide the AD configuration 908 (e.g., the pre-configured AD for SL positioning). Thus, a location server (e.g., a location management function (LMF)) or a base station may be configured with specified posSIB(s) that include pre-configured AD for SL positioning. For purposes of illustration, the network 906 may refer to a base station, component(s) of the base station, a location server, and / or a network entity collectively.

[0107] In another example, at 912, the network 906 (e.g., an LMF or a base station, etc.) may provide the AD configuration 908 to the first UE 902, such as via a radio resource control (RRC) message or using a positioning protocol message (e.g., an LPP or NRPP A message). The first UE 902 may be an anchor UE in this context. In addition, an anchor UE may also be configured with the capability to define a set of configuration for other SL UEs (e.g., other anchor UEs). For example, as shown at 914, if a second UE 904 is an anchor UE participating in the SL positioning session with the first UE 902, the second UE 904 may be configured to define / set the AD configuration 908 and transmit the AD configuration 908 to the first UE 902 (whom may also be an anchor UE under such context). Similarly, the first UE 902 may be configured to define and transmit the AD configuration 908 to the second UE 904 (e.g., for the SL positioning session). In both scenarios, the anchor UE (e.g., the first UE 902 and / or the second UE 904) may be provided with the set of configurations (e.g., the AD configuration 908) that may be used for the SL positioning session, where the anchor UE may use PC5 and / or RRC transfer protocol(s) to transfer these set of configurations to other SL UE(s) participating in the SL positioning session.

[0108] In another example, the AD configuration 908 or at least a portion of the AD configuration 908 may be defined in a specification or in a standard, where each configuration / parameter in the AD configuration 908 may be associated with an identifier (e.g., a unique identifier). Then, the second UE 904 and / or the network 906 may provide the AD configuration 908 to the first UE 902 by providing / using theidentifier (e.g., associated with a specified AD configuration) as part of sidelink control information (SCI) and / or PC5 RRC configuration(s).

[0109] In one aspect of the present disclosure, the AD configuration 908 (e.g., the preconfigured AD for SL positioning) may include a set of fixed configuration elements and a set of dynamic configuration elements. The set of fixed configuration elements may include the SL resource pool to be used for the SL positioning, the comb symbol option to be used for the SL positioning (e.g., the comb pattern to be used, the starting / offset symbol for the comb, etc.). The set of fixed configuration elements may remain fixed for a defined period of time (e.g., for a day, for a month, etc.) or permanently, and just the network 906 (e.g., a base station, an LMF) may be permitted / allowed to make change to the set of fixed configuration elements. However, in some implementations, based on UE capabilities, some SL UE(s) may also have the capability / permission to change / modify the set of fixed configuration elements, such as SL UE(s) assigned with a higher priority / rank and / or SL UE(s) with higher UE capabilities (e.g., with a higher processing capability). In addition, or as an alternative, some SL UE(s) may also be permitted to request the network 906 to make change(s) to the set of fixed configuration elements (e.g., request / recommend changes to few parameters in the set of fixed configuration elements).

[0110] The set of dynamic configuration elements may include symbol position and / or frequency position (e.g., within a slot of a PRS resource) associated with the SL positioning. A SL UE participating in the SL positioning session (e.g., the first UE 902, the second UE 904, etc.) and / or the network 906 (e.g., a base station, an LMF) may be permitted to change parameter(s) related / belong to set of dynamic configuration elements. In one implementations, an anchor UE (e.g., the first UE 902, the second UE 904, etc.) may be configured to provide changed parameter(s) in the set of dynamic configuration elements to other UEs participating in the SL positioning session (which may be referred to as “participated / participating SL UE(s)” hereafter).

[0111] Depending on the implementations, different / various combinations may be implemented with a mixture of fixed configuration elements and dynamic configuration elements. For example, in some implementations, a UE (e.g., the first UE 902, the second UE 904, etc.) may be allowed to just select the symbol associated with the SL positioning (e.g., for transmitting the SL PRS), and the UE may not make change to other configurations (e.g., in a given AD). In some implementations, a UEmay be allowed to just select the symbol and the frequency offset associated with the SL positioning (e.g., for transmitting the SL PRS). In some implementations, a UE may be allowed just to select the bandwidth (e.g., the smaller bandwidth) within a resource pool (RP) (e.g., a sidelink resource pool that includes a set of resource blocks (RBs)), etc.

[0112] In another aspect of the present disclosure, a UE (e.g., the first UE 902, the second UE 904, etc.) may be configured to start with a set of hardcoded configurations (a set of configured AD for SL positioning), such as when the UE is in a cold start (e.g., after turning on) and / or when the UE is out of service (OOS) area. Then, when the UE is connected to a network or comes back to service (from OOS), the network (e.g., the network 906) may provide new configured AD for the SL positioning to the UE, which may override the set of hardcoded configurations at the UE.

[0113] There may be different / various implementations related to the validity of the new configured AD from the network and / or the timing for the UE to switch back to or apply the set of hardcoded configurations. In one configuration, a network (e.g., the network 906) may be configured to explicitly provide a time (e.g., a specific time) or an expiry timer for the new configured AD. As such, a UE (e.g., the first UE 902, the second UE 904, etc.) may apply the new configured AD prior to the provided time or before the expiry timer expires. After the time or the expiry timer expires, the UE may be configured to apply the set of hardcoded configurations. In another configuration, a UE (e.g., the first UE 902, the second UE 904, etc.) may be configured to use the new configured AD when the UE stays in service with the network, and the UE may be configured to use the set of hardcoded configurations when the UE is out of the service (of the network). In another configuration, a network (e.g., the network 906) may provide a UE (e.g., the first UE 902, the second UE 904, etc.) a first set of configured AD to be used by the UE when the UE is in the service, and a second set of configured AD to be used by the UE when the UE is out of the service. Similarly, in another configuration, the first set of configured AD (for use in the service) and / or the second set of configured AD (for use out of the service) may be associated with a time or a validity timer, where the UE may apply the configured AD before the time or before the validity timer expires. Then, the UE may resume applying the set of hardcoded configurations after the time or after the validity timer expires.

[0114] In some scenarios, a sequence ID may be specified by a UE for generating SL PRS resources, where this SL PRS sequence ID may be provided by an upper layer. Thus, when a group of UEs are participating in a SL positioning session, a network may be specified to transmit / configure the SL PRS sequence ID(s) to the participating SL UE(s). For example, in some network implementations, an SL PRS sequence may be generated based on a Gold sequence:where c(i) is a pseudo-random sequence. For SL PRS sequence generation, the pseudo-random sequence c(i) initialization equation may be defined as a function of at least: slot number, symbol number, and a parameter. The pseudo-random sequence c(i) initialization equation may be based on initialization equation as forDL PRS. In one example, for SL PRS sequence generation, the parametermay be configured to be (1) ftjDseq is a higher layer configured parameter, (2) nffiseq is based on 12 bits CRC of PSCCH associated with the SL PRS transmission, (3) based on a combination of higher layer configured parameter from a configured ID list and 12 bits of CRC of PSCCH associated with the SL PRS transmission,is based on 12 bits least significant bit (LSB) of destination ID,is based on 8 bits of source ID + 4 zero bits,is based on the CRC field of the 2nd SCI associated with SL PRS transmission, if there is a 2nd SCI defined, etc. In addition, the range of the parametermay be:G {0,1, ... ,4095}.

[0115] As such, in another aspect of the present disclosure, as shown at 916, the first UE 902 (and / or the second UE 904) may be configured to generate SL PRS sequence ID automatically to improve the latency of the SL positioning. For example, the first UE 902 may be configured to generate a sequence ID for a set of SL PRS resources associated with the SL positioning session based on an identifier associated with the first UE 902 (e.g., the PRS sequence ID generation is configured to be a function of a UE identifier or a SL UE identifier). For example, the identifier associated with the first UE 902 may be its International Mobile Equipment Identity (IMEI), International Mobile Subscriber Identity (IMSI), Serving Radio Network Controller (SRNC)-Radio Network Temporary Identifier (RNTI) (S-RNTI), and / or any other temporary or permanent identifier(s), etc. Such configuration may save the effort of transmitting / configuring the SL PRS sequence ID to the participating SL UE(s) (e.g.,the first UE 902). In some implementations, as shown at 917, the first UE 902 may also transmit the generated sequence ID to other UE(s), such as the second UE 904.

[0116] In some examples, each symbol of an SL PRS may be configured with a combstructure in frequency, where the SL PRS from a UE may occupy every TV111subcarrier (e.g., N= 2, 4, 6, 12, etc.). The length of an SL PRS within one slot may be a multiple of N symbols and the position of the first symbol within a slot may be flexible as long as the slot consists of at least N SL PRS symbols. FIGs. 10A and 10B are diagrams 1000A and 1000B, respectively, illustrating example patterns of SL PRS resource within a slot in accordance with various aspect of the present disclosure. The patterns illustrated by the diagrams 1000A and 1000B may be referred to as “staggered pattern” or a “frequency-domain staggered pattern,” where the resource elements on which the SL PRS are transmitted may be staggered in the frequency domain of a given bandwidth such that these resource elements are not adjacent to each other in two consecutive resource elements on the given bandwidth. In addition, while the resource elements on which the SL PRS are transmitted may be staggered over multiple symbols, the resource elements may occupy the whole bandwidth if they are de-staggered. For example, diagram 1000A illustrates an example SL PRS resource based on a comb-2 with 2 symbols pattern, where there is one PRS resource element per every two subcarriers in the frequency domain for two occupying symbols, such as shown at 1002. In addition, a set of frequency offsets may be applied to the PRS resource elements in each of the occupying symbols. For example, a frequency offset of {0, 1} may be applied to the comb-2 with 2 symbols pattern, where PRS resource elements on the first occupying symbol may be transmitted with an offset of zero (0) and PRS resource elements on the second occupying symbol may be transmitted with an offset of one (1). As such, the PRS resource elements may also not be adjacent to each other on the time domain. As shown at 1004, while the PRS resource elements may be staggered in a given bandwidth (and also on a given time domain), after a UE receives these PRS resource elements, the UE may still able to receive the full bandwidth of the PRS, which may be referred to as de-staggering a staggered pattern or turning a staggered pattern to an unstaggered pattern. Similarly, diagram 1000B illustrates an example SL PRS resource based on a comb-4 with 4 symbols pattern, where there is one PRS resource element per every four subcarriers in the frequencydomain for four occupying symbols and the pattern may include a frequency offset of {0, 2, 1, 3}.

[0117] Different UEs (e.g., SL UEs) may have different comb compatibility type for SL positioning. For example, referring back to FIG. 9, the first UE 902 may support just comb-2 with 2 symbols PRS structure as described in connection with FIG. 10A, whereas the second UE 904 may support just comb-4 with 4 symbols PRS structure as described in connection with FIG. 10B. As such, in another aspect of the present disclosure, as shown at 918, the network 906 (e.g., a base station, an LMF, etc.) may be configured to provide a set / list of (possible) comb options that may be used in a given resource pool (RP) and / or a given slot to the first UE 902 and / or the second UE 904. For example, the set of comb options may indicate that: comb 2 and 4 can be used in the RP1, comb 2 and 6 can be used in the RP2, comb 2 and 4 can be used in the RP3, odd slots, and / or comb 3 and 6 can be used in the RP3, even slots, etc. A set of possible comb-aggregation may also be defined by a specification or a standard, which may include comb 2 and comb 4, comb 3 and comb 6, comb 6 and comb 12, and / or comb 2 and comb 6, etc. In addition, mixed comb symbol PRS resources decoding and transmission may be part of UE capabilities.

[0118] Based on the set / list of comb options from the network, a UE may select at least one comb option from the set / list of comb options. In one implementation, a network may (e.g., the network 906) provide a UE (e.g., the first UE 902, the second UE 904, etc.) with a set of comb options to select (e.g., for applying to transmission of PRS), and the UE may be just allowed to select a comb option that is within the set of comb options provided by the network. In another implementation, a network may provide a UE with a set of frequency offsets to select (e.g., for applying to transmission of PRS), and the UE may be just allowed to select a frequency offset that is within the set of frequency offsets provided by the network. In another implementation, a network may provide a UE with a set of symbol options to select (e.g., for applying to transmission of PRS), and the UE may be just allowed to select a symbol option that is within the set of symbol options provided by the network. In another implementation, a network may provide a UE with a set of comb and symbol options to select (e.g., for applying to transmission of PRS), and the UE may be just allowed to select a comb and symbol option that is within the set of comb and symbol options provided by the network. In another implementation, a network may provide a UEwith a set of comb and frequency offset options to select (e.g., for applying to transmission of PRS), and the UE may be just allowed to select a comb and frequency offset option that is within the set of comb and frequency offset options provided by the network. In another implementation, a network may provide a UE with a set of comb and symbol and frequency offset options to select (e.g., for applying to transmission of PRS), and the UE may be just allowed to select a comb and symbol and frequency offset option that is within the set of comb and symbol and frequency offset options provided by the network. In some implementations, this resource selection policy may be configured to change periodically, such as after very T seconds. Then, an upper layer may provide a new selection policy to the UE for the resource selection.

[0119] In another aspects of the present disclosure, a group of UEs participating in an SL positioning session may be configured to apply a single configuration (e.g., for transmitting the PRS) or configured with multiple / different configurations (e.g., for transmitting the PRS). For example, under the single configuration setting, a group of UEs participating in the SL positioning session (e.g., the participating SL UEs) may be provided with the same or similar PRS configurations. In addition, a network (e.g., the network 906, an LMF, etc.) and / or an anchor UE (e.g., the first UE 902, the second UE 904, etc.) may be configured / selected to negotiate with other participating SL UEs to produce the single configuration.

[0120] On the other hand, under the multiple configurations setting, UEs participating in the SL positioning session may have different PRS configurations (or at least two UEs in the group may have different PRS configurations). In some examples, a set of UEs (in the group of UEs) within the SL positioning session may be configured to use the same PRS configuration and there may be multiple / different sets of PRS configurations available. Depending on the implementation, the maximum number of set that may be provided to a UE or a group of UE may be defined in a specification or a standard, and / or based on the UE capabilities. In addition, there may be at least M UEs specified to have different PRS configurations, where M may be as small as one (1). This may enable different UEs or different sets of UEs participating in an SL positioning session to apply different PRS settings to reduce the likelihood of collision (e.g., two UEs transmitting PRS using same time and frequency resources and / or comb options, etc.). In some implementations, different sets of PRS configurationsand / or different UEs may also be associated / assigned with different priorities. For example, a specified number of UEs in the group of UEs may be configured to select a PRS configuration with the highest priority under a set of conditions, and / or select a PRS configuration with a next highest priority if the PRS configuration with the highest priority is not available (e.g., has already been selected by a maximum number of UEs allowed). In another example, UEs with a higher UE capability may be associated with a higher priority and configured with a first set of PRS configurations, and UEs with a lower UE capability may be associated with a lower priority and configured with another set of PRS configurations.

[0121] Referring back to FIG. 9, at 920, the first UE 902 may be configured / requested to participate in the SL positioning session, such as with the second UE 904 and a target UE 905 whose position is to be determined / estimated (e.g., by the target UE 905 itself or the network 906) for the SL positioning session. The first UE 902 and the second UE 904 may be anchor UEs in the SL positioning session under such context.

[0122] At 922, the first UE 902 may select and apply at least one set of AD in the multiple sets of AD in the AD configuration 908 for the SL positioning session, such as apply the at least one set of AD to transmission of PRS to the target UE 905 as shown at 924. The selection and application of the at least one set of AD from the multiple sets of AD (e.g., the selection of a pre-configured AD for SL positioning from multiple pre-configurations) may be based on the location of the first UE 902 or based on an area ID associated with the location of the first UE 902 as described in connection with FIG. 6.

[0123] In some examples, the first UE 902 may also be configured to output an indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, such as transmitting the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session (e.g., to the network 906), and / or storing the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session (e.g., for record keeping or tracking purposes).

[0124] Aspects presented herein may improve the overall latency and performance of SL positioning by enabling one or more UEs participating in an SL positioning session to be (pre-)configured with AD for the SL positioning session. DL PRS assistance data is provided to the UE (before or during an ongoing LPP positioning session) forpositioning measurements. (Pre-)configured DL PRS AD may include multiple instances, where each instance is applicable to a different area within a network. The preconfigured measurement gap procedure is used by the network to provide measurement gap for NR DL PRS measurements. The gNB may activate / deactivate the preconfigured measurement gap upon receiving the request from a UE or LMF. Aspects presented herein provide preconfigured DL PRS AD for SL configurations and illustrate various options to provide SL positioning pre-configurations for the SL UE (for example, UE hardcode, posSIB transfer, PC5 RRC transfer, specification defined, etc.). Other aspects include (a) dividing the SL PRS into fixed configuration element or dynamic configuration element, or other combinations; (b) autonomous generation of SL PRS sequence ID; (c) comb compatibility; (d) resource selection update; and (e) single and multiple PRS configurations.

[0125] FIG. 11 is a flowchart 1100 of a method of wireless communication at a user equipment (UE). The method may be performed by a UE (e.g., the UE 104, 404, 502, 504, 506, 508, 602, 702, 802; the first UE 902; the second UE 904; the apparatus 1304). The method may enable the UE (e.g., a first UE) to be pre -configured with a set of AD for the SL positioning.

[0126] At 1102, a first UE may obtain an assistance data (AD) configuration associated with a sidelink (SL) positioning session, where the AD configuration includes multiple sets of AD, such as described in connection with FIG. 9. For example, as discussed in connection with 910, the first UE 902 may obtain an AD configuration 908 associated with an SL positioning session, where the AD configuration 908 may include multiple sets of AD. The obtainment of the AD configuration may be performed by, e.g., the pre -configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13.

[0127] In one example, to obtain the AD configuration, the first UE may obtain at least one of a first set of AD in the multiple sets of AD from a memory of the first UE or from a Subscriber Identity Module (SIM), a second set of AD in the multiple sets of AD via a positioning system information block (SIB) (posSIB), or a third set of AD in the multiple sets of AD via radio resource control (RRC) messaging.

[0128] In another example, each set of AD in the multiple sets of AD may include a set of fixed SL positioning reference signal (PRS) configuration elements and a set ofdynamic SL PRS configuration elements, where each of the set of fixed SL PRS configuration elements may be configured to remain fixed for a defined period of time. In some implementations, the set of fixed SL PRS configuration elements may include one or more of an SL resource pool associated with the SL positioning session, or a set of comb symbol options associated with the SL positioning session. In some implementations, the set of dynamic SL PRS configuration elements may include one or more of a symbol position associated with the SL positioning session, or a frequency position associated with the SL positioning session. In some implementations, the first UE may modify the set of dynamic SL PRS configuration elements, and transmit, to the at least on second UE, an indication of the modified set of dynamic SL PRS configuration elements.

[0129] At 1106, the first UE may participate in the SL positioning session with at least one second UE, such as described in connection with FIG. 9. For example, as discussed in connection with 920, the first UE 902 may be configured / requested to participate in the SL positioning session, such as with the second UE 904 and a target UE 905 whose position is to be determined / estimated (e.g., by the target UE 905 itself or the network 906) for the SL positioning session. The participation of the SL positioning session may be performed by, e.g., the pre-configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13.

[0130] At 1110, the first UE may apply at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area identification (ID) associated with the location of the first UE, such as described in connection with FIG. 9. For example, as discussed in connection with 922, the first UE 902 may apply at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE 902 or based on an area ID associated with the location of the first UE 902. The application of the at least one set of AD in the multiple sets of AD may be performed by, e.g., the pre-configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13.

[0131] In one example, to apply the at least one set of AD in the multiple sets of AD for the SL positioning session, the first UE may apply a first set of AD in the multiple sets ofAD for the SL positioning session when the first UE is out of a service area or when the first UE powers up, and apply a second set of AD in the multiple sets of AD for the SL positioning session when the first UE is within the service area and the first UE is powered up. In some implementations, the second set of AD may be associated with a validity timer, and the first UE may apply the first set of AD for the SL positioning session after an expiration of the validity timer for the second set of AD.

[0132] In another example, the first UE may transmit, to the at least one second UE, one or more sets of AD in the multiple sets of AD for the SL positioning session, where the participation in the SL positioning session is based on the one or more sets of AD, such as described in connection with FIG. 9. For example, as discussed in connection with 914, the first UE 902 be configured to transmit the AD configuration 908 to the second UE 904 (e.g., for the SL positioning session). The transmission of the one or more sets of AD in the multiple sets of AD may be performed by, e.g., the preconfigured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13.

[0133] In another example, the first UE may generate a sequence identification (ID) for a set of SL position reference signal (PRS) resources associated with the SL positioning session based on an identifier associated with the first UE, such as described in connection with FIG. 9. For example, as discussed in connection with 916, the first UE 902 may generate a sequence ID for a set of SL PRS resources associated with the SL positioning session based on an identifier associated with the UE. The generation of the sequence ID may be performed by, e.g., the pre-configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13. In some implementations, the first UE may transmit the generated sequence ID to the at least one second UE. In some implementations, the identifier associated with the first UE may correspond to at least one of: an international mobile equipment identity (IMEI), an international mobile subscriber identity (IMSI), a serving radio network controller (RNC) radio network temporary identifier (S-RNTI), or a temporary or permanent identifier assigned to the first UE.

[0134] In another example, the first UE may receive a list of supported comb options for the SL positioning session, and apply at least one comb option in the list of supportedcomb options for the SL positioning session based on a first capability of the first UE or a second capability of the at least one second UE.

[0135] In another example, the first UE may receive a list of frequency offsets for the SL positioning session, and apply at least one frequency offset in the list of frequency offsets for the SL positioning session.

[0136] In another example, the first UE may receive a list of symbol options for the SL positioning session, and apply at least one symbol option in the list of symbol options for the SL positioning session.

[0137] In another example, the multiple sets of AD used by the first UE and the at least one second UE for the SL positioning session may be equivalent.

[0138] In another example, the multiple sets of AD used by the first UE for the SL positioning session may be at least partially different from a second set of AD used by the at least one second UE for the SL positioning session.

[0139] In another example, the first UE may output an indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, such as described in connection with FIG. 9. For example, the first UE 902 may also be configured to output an indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, such as transmitting the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session (e.g., to the network 906), and / or storing the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session (e.g., for record keeping or tracking purposes). The output of the indication may be performed by, e.g., the pre-configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13. In some implementation, to output the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, the first UE may transmit the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, or store the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session.

[0140] FIG. 12 is a flowchart 1200 of a method of wireless communication at a user equipment (UE). The method may be performed by a UE (e.g., the UE 104, 404, 502, 504, 506, 508, 602, 702, 802; the first UE 902; the second UE 904; the apparatus1304). The method may enable the UE (e.g., a first UE) to be pre-configured with a set of AD for the SL positioning.

[0141] At 1202, a first UE may obtain an AD configuration associated with an SL positioning session, where the AD configuration includes multiple sets of AD, such as described in connection with FIG. 9. For example, as discussed in connection with 910, the first UE 902 may obtain an AD configuration 908 associated with an SL positioning session, where the AD configuration 908 may include multiple sets of AD. The obtainment of the AD configuration may be performed by, e.g., the pre-configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13.

[0142] In one example, to obtain the AD configuration, the first UE may obtain at least one of a first set of AD in the multiple sets of AD from a memory of the first UE or from a SIM, a second set of AD in the multiple sets of AD via a posSIB, or a third set of AD in the multiple sets of AD via RRC messaging.

[0143] In another example, each set of AD in the multiple sets of AD may include a set of fixed SL PRS configuration elements and a set of dynamic SL PRS configuration elements, where each of the set of fixed SL PRS configuration elements may be configured to remain fixed for a defined period of time. In some implementations, the set of fixed SL PRS configuration elements may include one or more of an SL resource pool associated with the SL positioning session, or a set of comb symbol options associated with the SL positioning session. In some implementations, the set of dynamic SL PRS configuration elements may include one or more of a symbol position associated with the SL positioning session, or a frequency position associated with the SL positioning session. In some implementations, the first UE may modify the set of dynamic SL PRS configuration elements, and transmit, to the at least on second UE, an indication of the modified set of dynamic SL PRS configuration elements.

[0144] At 1206, the first UE may participate in the SL positioning session with at least one second UE, such as described in connection with FIG. 9. For example, as discussed in connection with 920, the first UE 902 may be configured / requested to participate in the SL positioning session, such as with the second UE 904 and a target UE 905 whose position is to be determined / estimated (e.g., by the target UE 905 itself or thenetwork 906) for the SL positioning session. The participation of the SL positioning session may be performed by, e.g., the pre-configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13.

[0145] At 1210, the first UE may apply at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area ID associated with the location of the first UE, such as described in connection with FIG. 9. For example, as discussed in connection with 922, the first UE 902 may apply at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE 902 or based on an area ID associated with the location of the first UE 902. The application of the at least one set of AD in the multiple sets of AD may be performed by, e.g., the pre-configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13.

[0146] In one example, to apply the at least one set of AD in the multiple sets of AD for the SL positioning session, the first UE may apply a first set of AD in the multiple sets of AD for the SL positioning session when the first UE is out of a service area or when the first UE powers up, and apply a second set of AD in the multiple sets of AD for the SL positioning session when the first UE is within the service area and the first UE is powered up. In some implementations, the second set of AD may be associated with a validity timer, and the first UE may apply the first set of AD for the SL positioning session after an expiration of the validity timer for the second set of AD.

[0147] In another example, as shown at 1204, the first UE may transmit, to the at least one second UE, one or more sets of AD in the multiple sets of AD for the SL positioning session, where the participation in the SL positioning session is based on the one or more sets of AD, such as described in connection with FIG. 9. For example, as discussed in connection with 914, the first UE 902 be configured to transmit the AD configuration 908 to the second UE 904 (e.g., for the SL positioning session). The transmission of the one or more sets of AD in the multiple sets of AD may be performed by, e.g., the pre -configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13.

[0148] In another example, as shown at 1208, the first UE may generate a sequence ID for a set of SL PRS resources associated with the SL positioning session based on an identifier associated with the first UE, such as described in connection with FIG. 9. For example, as discussed in connection with 916, the first UE 902 may generate a sequence ID for a set of SL PRS resources associated with the SL positioning session based on an identifier associated with the UE. The generation of the sequence ID may be performed by, e.g., the pre-configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13. In some implementations, the first UE may transmit the generated sequence ID to the at least one second UE. In some implementations, the identifier associated with the first UE may correspond to at least one of an IMEI, an IMSI, an S-RNTI, or a temporary or permanent identifier assigned to the first UE.

[0149] In another example, the first UE may receive a list of supported comb options for the SL positioning session, and apply at least one comb option in the list of supported comb options for the SL positioning session based on a first capability of the first UE or a second capability of the at least one second UE.

[0150] In another example, the first UE may receive a list of frequency offsets for the SL positioning session, and apply at least one frequency offset in the list of frequency offsets for the SL positioning session.

[0151] In another example, the first UE may receive a list of symbol options for the SL positioning session, and apply at least one symbol option in the list of symbol options for the SL positioning session.

[0152] In another example, the multiple sets of AD used by the first UE and the at least one second UE for the SL positioning session may be equivalent.

[0153] In another example, the multiple sets of AD used by the first UE for the SL positioning session may be at least partially different from a second set of AD used by the at least one second UE for the SL positioning session.

[0154] In another example, as shown at 1212, the first UE may output an indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, such as described in connection with FIG. 9. For example, the first UE 902 may also be configured to output an indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, suchas transmitting the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session (e.g., to the network 906), and / or storing the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session (e.g., for record keeping or tracking purposes). The output of the indication may be performed by, e.g., the pre-configured assistance data application component 198, the transceiver(s) 1322, the cellular baseband processor(s) 1324, and / or the application processor(s) 1306 of the apparatus 1304 in FIG. 13. In some implementation, to output the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, the first UE may transmit the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, or store the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session.

[0155] FIG. 13 is a diagram 1300 illustrating an example of a hardware implementation for an apparatus 1304. The apparatus 1304 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus 1304 may include at least one cellular baseband processor 1324 (also referred to as a modem) coupled to one or more transceivers 1322 (e.g., cellular RF transceiver). The cellular baseband processor(s) 1324 may include at least one on-chip memory 1324'. In some aspects, the apparatus 1304 may further include one or more subscriber identity modules (SIM) cards 1320 and at least one application processor 1306 coupled to a secure digital (SD) card 1308 and a screen 1310. The application processor(s) 1306 may include on-chip memory 1306'. In some aspects, the apparatus 1304 may further include a Bluetooth module 1312, a WLAN module 1314, an ultrawide band (UWB) module 1338, an SPS module 1316 (e.g., GNSS module), one or more sensors 1318 (e.g., barometric pressure sensor / altimeter; motion sensor such as inertial measurement unit (IMU), gyroscope, and / or accelerometer(s); light detection and ranging (LIDAR), radio assisted detection and ranging (RADAR), sound navigation and ranging (SONAR), magnetometer, audio and / or other technologies used for positioning), additional memory modules 1326, a power supply 1330, and / or a camera 1332. The Bluetooth module 1312, the UWB module 1338, the WLAN module 1314, and the SPS module 1316 may include an on-chip transceiver (TRX) (or in some cases, just a receiver (RX)). The Bluetooth module 1312, the WLAN module 1314,and the SPS module 1316 may include their own dedicated antennas and / or utilize the antennas 1380 for communication. The cellular baseband processor(s) 1324 communicates through the transceiver(s) 1322 via one or more antennas 1380 with the UE 104 and / or with an RU associated with a network entity 1302. The cellular baseband processor(s) 1324 and the application processor(s) 1306 may each include a computer-readable medium / memory 1324', 1306', respectively. The additional memory modules 1326 may also be considered a computer-readable medium / memory. Each computer-readable medium / memory 1324', 1306', 1326 may be non- transitory. The cellular baseband processor(s) 1324 and the application processor(s) 1306 are each responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the cellular baseband processor(s) 1324 / application processor(s) 1306, causes the cellular baseband processor(s) 1324 / application processor(s) 1306 to perform the various functions described supra. The cellular baseband processor(s) 1324 and the application processor(s) 1306 are configured to perform the various functions described supra based at least in part of the information stored in the memory. That is, the cellular baseband processor(s) 1324 and the application processor(s) 1306 may be configured to perform a first subset of the various functions described supra without information stored in the memory and may be configured to perform a second subset of the various functions described supra based on the information stored in the memory. The computer-readable medium / memory may also be used for storing data that is manipulated by the cellular baseband processor(s) 1324 / application processor(s) 1306 when executing software. The cellular baseband processor(s) 1324 / application processor(s) 1306 may be a component of the UE 350 and may include the at least one memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359. In one configuration, the apparatus 1304 may be at least one processor chip (modem and / or application) and include just the cellular baseband processor(s) 1324 and / or the application processor(s) 1306, and in another configuration, the apparatus 1304 may be the entire UE (e.g., see UE 350 of FIG. 3) and include the additional modules of the apparatus 1304.

[0156] As discussed supra, the pre-configured assistance data application component 198 may be configured to obtain an AD configuration associated with an SL positioning session, where the AD configuration includes multiple sets of AD. The pre-configuredassistance data application component 198 may also be configured to participate in the SL positioning session with at least one second UE. The pre-configured assistance data application component 198 may also be configured to apply at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area ID associated with the location of the first UE. The pre-configured assistance data application component 198 may be within the cellular baseband processor(s) 1324, the application processor(s) 1306, or both the cellular baseband processor(s) 1324 and the application processor(s) 1306. The preconfigured assistance data application component 198 may be one or more hardware components specifically configured to carry out the stated processes / algorithm, implemented by one or more processors configured to perform the stated processes / algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof. When multiple processors are implemented, the multiple processors may perform the stated processes / algorithm individually or in combination. As shown, the apparatus 1304 may include a variety of components configured for various functions. In one configuration, the apparatus 1304, and in particular the cellular baseband processor(s) 1324 and / or the application processor(s) 1306, may include means for obtaining an AD configuration associated with an SL positioning session, where the AD configuration includes multiple sets of AD. The apparatus 1304 may further include means for participating in the SL positioning session with at least one second UE. The apparatus 1304 may further include means for applying at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area ID associated with the location of the first UE.

[0157] In one configuration, to obtain the AD configuration, the apparatus 1304 may be configured to obtain at least one of: a first set of AD in the multiple sets of AD from a memory of the apparatus 1304 or from a SIM, a second set of AD in the multiple sets of AD via a posSIB, or a third set of AD in the multiple sets of AD via RRC messaging.

[0158] In another configuration, each set of AD in the multiple sets of AD may include a set of fixed SL PRS configuration elements and a set of dynamic SL PRS configuration elements, where each of the set of fixed SL PRS configuration elements may be configured to remain fixed for a defined period of time. In some implementations, theset of fixed SL PRS configuration elements may include one or more of: an SL resource pool associated with the SL positioning session, or a set of comb symbol options associated with the SL positioning session. In some implementations, the set of dynamic SL PRS configuration elements may include one or more of: a symbol position associated with the SL positioning session, or a frequency position associated with the SL positioning session. In some implementations, the apparatus 1304 may further include means for modifying the set of dynamic SL PRS configuration elements, and means for transmitting, to the at least on second UE, an indication of the modified set of dynamic SL PRS configuration elements.

[0159] In one configuration, to apply the at least one set of AD in the multiple sets of AD for the SL positioning session, the apparatus 1304 may be configured to apply a first set of AD in the multiple sets of AD for the SL positioning session when the apparatus 1304 is out of a service area or when the apparatus 1304 powers up, and apply a second set of AD in the multiple sets of AD for the SL positioning session when the apparatus 1304 is within the service area and the apparatus 1304 is powered up. In some implementations, the second set of AD may be associated with a validity timer, and the apparatus 1304 may further include means for applying the first set of AD for the SL positioning session after an expiration of the validity timer for the second set of AD.

[0160] In another configuration, the apparatus 1304 may further include means for transmitting, to the at least one second UE, one or more sets of AD in the multiple sets of AD for the SL positioning session, where the participation in the SL positioning session is based on the one or more sets of AD.

[0161] In another configuration, the apparatus 1304 may further include means for generating a sequence ID for a set of SL PRS resources associated with the SL positioning session based on an identifier associated with the apparatus 1304. In some implementations, the apparatus 1304 may further include means for transmitting the generated sequence ID to the at least one second UE. In some implementations, the identifier associated with the apparatus 1304 may correspond to at least one of: an IMEI, an IMSI, an S- RNTI, or a temporary or permanent identifier assigned to the apparatus 1304.

[0162] In another configuration, the apparatus 1304 may further include means for receiving a list of supported comb options for the SL positioning session, and means for applying at least one comb option in the list of supported comb options for the SLpositioning session based on a first capability of the apparatus 1304 or a second capability of the at least one second UE.

[0163] In another configuration, the apparatus 1304 may further include means for receiving a list of frequency offsets for the SL positioning session, and means for applying at least one frequency offset in the list of frequency offsets for the SL positioning session.

[0164] In another configuration, the apparatus 1304 may further include means for receiving a list of symbol options for the SL positioning session, and means for applying at least one symbol option in the list of symbol options for the SL positioning session.

[0165] In another configuration, the multiple sets of AD used by the apparatus 1304 and the at least one second UE for the SL positioning session may be equivalent.

[0166] In another configuration, the multiple sets of AD used by the apparatus 1304 for the SL positioning session may be at least partially different from a second set of AD used by the at least one second UE for the SL positioning session.

[0167] In another configuration, the apparatus 1304 may further include means for outputting an indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session. In some implementation, to output the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, the apparatus 1304 may be configured to transmit the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session, or store the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session.

[0168] The means may be the pre -configured assistance data application component 198 of the apparatus 1304 configured to perform the functions recited by the means. As described supra, the apparatus 1304 may include the TX processor 368, the RX processor 356, and the controller / processor 359. As such, in one configuration, the means may be the TX processor 368, the RX processor 356, and / or the controller / processor 359 configured to perform the functions recited by the means.

[0169] It is understood that the specific order or hierarchy of blocks in the processes / flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes / flowcharts may be rearranged. Further, some blocks may be combined oromitted. The accompanying method claims present elements of the various blocks in a sample order, and are not limited to the specific order or hierarchy presented.

[0170] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not limited to the aspects described herein, but are to be accorded the full scope consistent with the language claims. Reference to an element in the singular does not mean “one and only one” unless specifically so stated, but rather “one or more.” Terms such as “if,” “when,” and “while” do not imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when,” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C ,” “one or more of A, B, or C ,” “at least one of A, B, and C ,” “one or more of A, B, and C ,” and “A, B, C, or any combination thereof’ include any combination of A, B, and / or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C ,” “one or more of A, B, or C ,” “at least one of A, B, and C ,” “one or more of A, B, and C ,” and “A, B, C, or any combination thereof’ may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. Sets should be interpreted as a set of elements where the elements number one or more. Accordingly, for a set of X, X would include one or more elements. When at least one processor is configured to perform a set of functions, the at least one processor, individually or in any combination, is configured to perform the set of functions. Accordingly, each processor of the at least one processor may be configured to perform a particular subset of the set of functions, where the subset is the full set, a proper subset of the set, or an empty subset of the set. A processor may be referred to as processor circuitry. A memory / memory module may be referred to as memory circuitry. If afirst apparatus receives data from or transmits data to a second apparatus, the data may be received / transmitted directly between the first and second apparatuses, or indirectly between the first and second apparatuses through a set of apparatuses. A device configured to “output” data or “provide” data, such as a transmission, signal, or message, may transmit the data, for example with a transceiver, or may send the data to a device that transmits the data. A device configured to “obtain” data, such as a transmission, signal, or message, may receive, for example with a transceiver, or may obtain the data from a device that receives the data. Information stored in a memory includes instructions and / or data. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are encompassed by the claims. Moreover, nothing disclosed herein is dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module,” “mechanism,” “element,” “device,” and the like may not be a substitute for the word “means.” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for.”

[0171] As used herein, the phrase “based on” shall not be construed as a reference to a closed set of information, one or more conditions, one or more factors, or the like. In other words, the phrase “based on A” (where “A” may be information, a condition, a factor, or the like) shall be construed as “based at least on A” unless specifically recited differently.

[0172] The following aspects are illustrative only and may be combined with other aspects or teachings described herein, without limitation.

[0173] Aspect 1 is a method of wireless communication at a first user equipment (UE), comprising: obtaining an assistance data (AD) configuration associated with a sidelink (SL) positioning session, wherein the AD configuration includes multiple sets of AD; participating in the SL positioning session with at least one second UE; and applying at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area identification (ID) associated with the location of the first UE.

[0174] Aspect 2 is the method of aspect 1, wherein obtaining the AD configuration comprises obtaining at least one of a first set of AD in the multiple sets of AD from a memoryof the first UE or from a Subscriber Identity Module (SIM), a second set of AD in the multiple sets of AD via a positioning system information block (SIB) (posSIB), or a third set of AD in the multiple sets of AD via radio resource control (RRC) messaging.

[0175] Aspect 3 is the method of aspect 1 or aspect 2, wherein each set of AD in the multiple sets of AD includes a set of fixed SL positioning reference signal (PRS) configuration elements and a set of dynamic SL PRS configuration elements, wherein each of the set of fixed SL PRS configuration elements is configured to remain fixed for a defined period of time.

[0176] Aspect 4 is the method of aspect 3, wherein the set of fixed SL PRS configuration elements includes one or more of: an SL resource pool associated with the SL positioning session, or a set of comb symbol options associated with the SL positioning session.

[0177] Aspect 5 is the method of aspect 3, wherein the set of dynamic SL PRS configuration elements include one or more of: a symbol position associated with the SL positioning session, or a frequency position associated with the SL positioning session.

[0178] Aspect 6 is the method of aspect 3, further comprising: modifying the set of dynamic SL PRS configuration elements; and transmitting, to the at least on second UE, an indication of the modified set of dynamic SL PRS configuration elements.

[0179] Aspect 7 is the method of any of aspects 1 to 6, further comprising: transmitting, to the at least one second UE, one or more sets of AD in the multiple sets of AD for the SL positioning session, wherein the participation in the SL positioning session is based on the one or more sets of AD.

[0180] Aspect 8 is the method of any of aspects 1 to 7, wherein applying the at least one set of AD in the multiple sets of AD for the SL positioning session comprises: applying a first set of AD in the multiple sets of AD for the SL positioning session when the first UE is out of a service area or when the first UE powers up; and applying a second set of AD in the multiple sets of AD for the SL positioning session when the first UE is within the service area and the first UE is powered up.

[0181] Aspect 9 is the method of aspect 8, wherein the second set of AD is associated with a validity timer, the method further comprising: applying the first set of AD for the SL positioning session after an expiration of the validity timer for the second set of AD.

[0182] Aspect 10 is the method of any of aspects 1 to 9, further comprising: generating a sequence identification (ID) for a set of SL position reference signal (PRS) resourcesassociated with the SL positioning session based on an identifier associated with the first UE; and transmitting the generated sequence ID to the at least one second UE.

[0183] Aspect 11 is the method of any of aspect 10, wherein the identifier associated with the first UE corresponds to at least one of an international mobile equipment identity (IMEI), an international mobile subscriber identity (IMSI), a serving radio network controller (RNC) radio network temporary identifier (S-RNTI), or a temporary or permanent identifier assigned to the first UE.

[0184] Aspect 12 is the method of any of aspects 1 to 11, further comprising: receiving a list of supported comb options for the SL positioning session; and applying at least one comb option in the list of supported comb options for the SL positioning session based on a first capability of the first UE or a second capability of the at least one second UE.

[0185] Aspect 13 is the method of any of aspects 1 to 12, further comprising: receiving a list of frequency offsets for the SL positioning session; and applying at least one frequency offset in the list of frequency offsets for the SL positioning session.

[0186] Aspect 14 is the method of any of aspects 1 to 13, further comprising: receiving a list of symbol options for the SL positioning session; and applying at least one symbol option in the list of symbol options for the SL positioning session.

[0187] Aspect 15 is the method of any of aspects 1 to 14, wherein the multiple sets of AD used by the first UE and the at least one second UE for the SL positioning session are equivalent.

[0188] Aspect 16 is the method of any of aspects 1 to 15, wherein the multiple sets of AD used by the first UE for the SL positioning session are at least partially different from a second set of AD used by the at least one second UE for the SL positioning session.

[0189] Aspect 17 is the method of any of aspects 1 to 16, further comprising: outputting an indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session.

[0190] Aspect 18 is the method of any of aspect 17, wherein outputting the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session comprises: transmitting the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session; or storing the indication of the application of the at least one set of AD in the multiple sets of AD for the SL positioning session.

[0191] Aspect 19 is an apparatus for wireless communication at a first user equipment (UE), including: at least one memory; and at least one processor coupled to the at least one memory and, based at least in part on information stored in the at least one memory, the at least one processor, individually or in any combination, is configured to implement any of aspects 1 to 18.

[0192] Aspect 20 is the apparatus of aspect 19, further including at least one transceiver coupled to the at least one processor.

[0193] Aspect 21 is an apparatus for wireless communication at a first user equipment (UE), including means for implementing any of aspects 1 to 18.

[0194] Aspect 22 is a computer-readable medium (e.g., a non-transitory computer-readable medium) storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1 to 18.

Claims

CLAIMSWHAT IS CLAIMED IS:

1. An apparatus for wireless communication at a first user equipment (UE), comprising: at least one memory; and at least one processor coupled to the at least one memory, the at least one processor, individually or in any combination, is configured to: obtain an assistance data (AD) configuration associated with a side link (SL) positioning session, wherein the AD configuration includes multiple sets of AD; participate in the SL positioning session with at least one second UE; and apply at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area identification (ID) associated with the location of the first UE.

2. The apparatus of claim 1, wherein to obtain the AD configuration, the at least one processor, individually or in any combination, is configured to obtain at least one of: a first set of AD in the multiple sets of AD from a memory of the first UE or from a Subscriber Identity Module (SIM), a second set of AD in the multiple sets of AD via a positioning system information block (SIB) (posSIB), or a third set of AD in the multiple sets of AD via radio resource control (RRC) messaging.

3. The apparatus of claim 1, wherein each set of AD in the multiple sets of AD includes a set of fixed SL positioning reference signal (PRS) configuration elements and a set of dynamic SL PRS configuration elements, wherein each of the set of fixed SL PRS configuration elements is configured to remain fixed for a defined period of time.

4. The apparatus of claim 3, wherein the set of fixed SL PRS configuration elements includes one or more of: an SL resource pool associated with the SL positioning session, or a set of comb symbol options associated with the SL positioning session.

5. The apparatus of claim 3, wherein the set of dynamic SL PRS configuration elements include one or more of: a symbol position associated with the SL positioning session, or a frequency position associated with the SL positioning session.

6. The apparatus of claim 3, wherein the at least one processor, individually or in any combination, is further configured to: modify the set of dynamic SL PRS configuration elements; and transmit, to the at least on second UE, an indication of the modified set of dynamic SL PRS configuration elements.

7. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: transmit, to the at least one second UE, one or more sets of AD in the multiple sets of AD for the SL positioning session, wherein the participation in the SL positioning session is based on the one or more sets of AD.

8. The apparatus of claim 1, wherein to apply the at least one set of AD in the multiple sets of AD for the SL positioning session, the at least one processor, individually or in any combination, is configured to: apply a first set of AD in the multiple sets of AD for the SL positioning session when the first UE is out of a service area or when the first UE powers up; and apply a second set of AD in the multiple sets of AD for the SL positioning session when the first UE is within the service area and the first UE is powered up.

9. The apparatus of claim 8, wherein the second set of AD is associated with a validity timer, wherein the at least one processor, individually or in any combination, is configured to: apply the first set of AD for the SL positioning session after an expiration of the validity timer for the second set of AD.

10. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: generate a sequence identification (ID) for a set of SL position reference signal (PRS) resources associated with the SL positioning session based on an identifier associated with the first UE.

11. The apparatus of claim 10, wherein the identifier associated with the first UE corresponds to at least one of: an international mobile equipment identity (IMEI), an international mobile subscriber identity (IMSI), a serving radio network controller (RNC) radio network temporary identifier (S- RNTI), or a temporary or permanent identifier assigned to the first UE.

12. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: receive a list of supported comb options for the SL positioning session; and apply at least one comb option in the list of supported comb options for the SL positioning session based on a first capability of the first UE or a second capability of the at least one second UE.

13. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: receive a list of frequency offsets for the SL positioning session; and apply at least one frequency offset in the list of frequency offsets for the SL positioning session.

14. The apparatus of claim 1, wherein the at least one processor, individually or in any combination, is further configured to: receive a list of symbol options for the SL positioning session; and apply at least one symbol option in the list of symbol options for the SL positioning session.

15. A method of wireless communication at a first user equipment (UE), comprising : obtaining an assistance data (AD) configuration associated with a sidelink (SL) positioning session, wherein the AD configuration includes multiple sets of AD; participating in the SL positioning session with at least one second UE; and applying at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area identification (ID) associated with the location of the first UE.

16. The method of claim 15, wherein obtaining the AD configuration comprises obtaining at least one of: a first set of AD in the multiple sets of AD from a memory of the first UE or from a Subscriber Identity Module (SIM), a second set of AD in the multiple sets of AD via a positioning system information block (SIB) (posSIB), or a third set of AD in the multiple sets of AD via radio resource control (RRC) messaging.

17. The method of claim 15, wherein each set of AD in the multiple sets of AD includes a set of fixed SL positioning reference signal (PRS) configuration elements and a set of dynamic SL PRS configuration elements, wherein each of the set of fixed SL PRS configuration elements is configured to remain fixed for a defined period of time.

18. The method of claim 17, wherein the set of fixed SL PRS configuration elements includes one or more of: an SL resource pool associated with the SL positioning session, or a set of comb symbol options associated with the SL positioning session.

19. The method of claim 17, wherein the set of dynamic SL PRS configuration elements include one or more of: a symbol position associated with the SL positioning session, or a frequency position associated with the SL positioning session.

20. The method of claim 17, further comprising:modifying the set of dynamic SL PRS configuration elements; and transmitting, to the at least on second UE, an indication of the modified set of dynamic SL PRS configuration elements.

21. The method of claim 15, further comprising: transmitting, to the at least one second UE, one or more sets of AD in the multiple sets of AD for the SL positioning session, wherein the participation in the SL positioning session is based on the one or more sets of AD.

22. The method of claim 15, wherein applying the at least one set of AD in the multiple sets of AD for the SL positioning session comprises: applying a first set of AD in the multiple sets of AD for the SL positioning session when the first UE is out of a service area or when the first UE powers up; and applying a second set of AD in the multiple sets of AD for the SL positioning session when the first UE is within the service area and the first UE is powered up.

23. The method of claim 22, wherein the second set of AD is associated with a validity timer, the method further comprising: applying the first set of AD for the SL positioning session after an expiration of the validity timer for the second set of AD.

24. The method of claim 15, further comprising: generating a sequence identification (ID) for a set of SL position reference signal (PRS) resources associated with the SL positioning session based on an identifier associated with the first UE; and transmitting the generated sequence ID to the at least one second UE.

25. The method of claim 24, wherein the identifier associated with the first UE corresponds to at least one of: an international mobile equipment identity (IMEI), an international mobile subscriber identity (IMSI), a serving radio network controller (RNC) radio network temporary identifier (S- RNTI), ora temporary or permanent identifier assigned to the first UE.

26. The method of claim 15, further comprising: receiving a list of supported comb options for the SL positioning session; and applying at least one comb option in the list of supported comb options for the SL positioning session based on a first capability of the first UE or a second capability of the at least one second UE.

27. The method of claim 15, further comprising: receiving a list of frequency offsets for the SL positioning session; and applying at least one frequency offset in the list of frequency offsets for the SL positioning session.

28. The method of claim 15, further comprising: receiving a list of symbol options for the SL positioning session; and applying at least one symbol option in the list of symbol options for the SL positioning session.

29. An apparatus for wireless communication at a first user equipment (UE), comprising: means for obtaining an assistance data (AD) configuration associated with a sidelink (SL) positioning session, wherein the AD configuration includes multiple sets of AD; means for participating in the SL positioning session with at least one second UE; and means for applying at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area identification (ID) associated with the location of the first UE.

30. A computer-readable medium storing computer executable code at a first user equipment (UE), the code when executed by at least one processor causes the at least one processor to:obtain an assistance data (AD) configuration associated with a sidelink (SL) positioning session, wherein the AD configuration includes multiple sets of AD; participate in the SL positioning session with at least one second UE; and apply at least one set of AD in the multiple sets of AD for the SL positioning session based on a location of the first UE or based on an area identification (ID) associated with the location of the first UE.

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