Assistance data for session-less sidelink-based position estimation procedure

Abstract

Disclosed are techniques for wireless communication. In an aspect, a wireless node transmits a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission. In an aspect, the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE. In an aspect, the UE selects a set of SL-PRS transmission parameters from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information, and performs the SL-PRS transmission in accordance with the set of SL- PRS transmission parameters. The wireless node receives and measures the SL-PRS transmission.

Description

Qualcomm Ref. No.2303292WO ASSISTANCE DATA FOR SESSION-LESS SIDELINK-BASED POSITION ESTIMATION PROCEDURE BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure

[0001] Aspects of the disclosure relate generally to wireless technologies. 2. Description of the Related Art

[0002] Wireless communication systems have developed through various generations, including a first-generation analog wireless phone service (1G), a second-generation (2G) digital wireless phone service (including interim 2.5G and 2.75G networks), a third-generation (3G) high speed data, Internet-capable wireless service and a fourth-generation (4G) service (e.g., Long Term Evolution (LTE) or WiMax). There are presently many different types of wireless communication systems in use, including cellular and personal communications service (PCS) systems. Examples of known cellular systems include the cellular analog advanced mobile phone system (AMPS), and digital cellular systems based on code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), the Global System for Mobile communications (GSM), etc.

[0003] A fifth generation (5G) wireless standard, referred to as New Radio (NR), enables higher data transfer speeds, greater numbers of connections, and better coverage, among other improvements. The 5G standard, according to the Next Generation Mobile Networks Alliance, is designed to provide higher data rates as compared to previous standards, more accurate positioning (e.g., based on reference signals for positioning (RS-P), such as downlink, uplink, or sidelink positioning reference signals (PRS)), and other technical enhancements. These enhancements, as well as the use of higher frequency bands, advances in PRS processes and technology, and high-density deployments for 5G, enable highly accurate 5G-based positioning. SUMMARY

[0004] The following presents a simplified summary relating to one or more aspects disclosed herein. Thus, the following summary should not be considered an extensive overview 1 QC2303292WOQualcomm Ref. No.2303292WO relating to all contemplated aspects, nor should the following summary be considered to identify key or critical elements relating to all contemplated aspects or to delineate the scope associated with any particular aspect. Accordingly, the following summary has the sole purpose to present certain concepts relating to one or more aspects relating to the mechanisms disclosed herein in a simplified form to precede the detailed description presented below.

[0005] In an aspect, a method of operating a user equipment (UE) includes receiving a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL- PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; selecting a set of SL-PRS transmission parameters from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information; and performing the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters.

[0006] In an aspect, a method of operating a wireless node includes transmitting a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; and performing one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information.

[0007] In an aspect, a user equipment (UE) includes one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: receive, via the one or more transceivers, a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL- PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data QC2303292WOQualcomm Ref. No.2303292WO comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; select a set of SL-PRS transmission parameters from the set of SL- PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information; and perform the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters.

[0008] In an aspect, a wireless node includes one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: transmit, via the one or more transceivers, a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; and perform one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information.

[0009] In an aspect, a user equipment (UE) includes means for receiving a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; means for selecting a set of SL-PRS transmission parameters from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information; and means for performing the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters.

[0010] In an aspect, a wireless node includes means for transmitting a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options QC2303292WOQualcomm Ref. No.2303292WO available for selection by the UE; and means for performing one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information.

[0011] In an aspect, a non-transitory computer-readable medium storing computer-executable instructions that, when executed by a user equipment (UE), cause the UE to: receive a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; select a set of SL-PRS transmission parameters from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information; and perform the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters.

[0012] In an aspect, a non-transitory computer-readable medium storing computer-executable instructions that, when executed by a wireless node, cause the wireless node to: transmit a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL- PRS transmission parameter options available for selection by the UE; and perform one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information.

[0013] Other objects and advantages associated with the aspects disclosed herein will be apparent to those skilled in the art based on the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS 4 QC2303292WOQualcomm Ref. No.2303292WO

[0014] The accompanying drawings are presented to aid in the description of various aspects of the disclosure and are provided solely for illustration of the aspects and not limitation thereof.

[0015] FIG. 1 illustrates an example wireless communications system, according to aspects of the disclosure.

[0016] FIGS.2A, 2B, and 2C illustrate example wireless network structures, according to aspects of the disclosure.

[0017] FIGS. 3A, 3B, and 3C are simplified block diagrams of several sample aspects of components that may be employed in a user equipment (UE), a base station, and a network entity, respectively, and configured to support communications as taught herein.

[0018] FIG. 4 is a diagram illustrating an example frame structure, according to aspects of the disclosure.

[0019] FIGS. 5A and 5B are diagrams of example sidelink slot structures with and without feedback resources, according to aspects of the disclosure.

[0020] FIG.6 is a diagram illustrating an example of a resource pool for positioning configured within a sidelink resource pool for communication, according to aspects of the disclosure.

[0021] FIGS.7A and 7B illustrate various scenarios of interest for sidelink-only or joint Uu and sidelink positioning, according to aspects of the disclosure.

[0022] FIG.8 illustrates a SLPP Session Establishment Procedure, in accordance with aspects of the disclosure.

[0023] FIG. 9 illustrates a SLPP Session-less Procedure, in accordance with aspects of the disclosure.

[0024] FIG. 10 illustrates a use case of the SLPP Session-less Procedure 900 of FIG. 9, in accordance with aspects of the disclosure.

[0025] FIG.11 illustrates a Table depicting V2X signaling fields, in accordance with aspects of the disclosure.

[0026] FIG.12 illustrates a SL-PRS configuration, in accordance with aspects of the disclosure.

[0027] FIG.13 illustrates an exemplary process of communications according to an aspect of the disclosure.

[0028] FIG.14 illustrates an exemplary process of communications according to an aspect of the disclosure. QC2303292WOQualcomm Ref. No.2303292WO

[0029] FIG. 15 illustrates an example implementation of the processes of FIGS. 13-14, respectively, in accordance with aspects of the disclosure. DETAILED DESCRIPTION

[0030] Aspects of the disclosure are provided in the following description and related drawings directed to various examples provided for illustration purposes. Alternate aspects may be devised without departing from the scope of the disclosure. Additionally, well-known elements of the disclosure will not be described in detail or will be omitted so as not to obscure the relevant details of the disclosure.

[0031] Various aspects relate generally to assistance data for session-less sidelink-based position estimation procedure. In some designs, sidelink positioning supports a session-based concept in sidelink positioning protocol (SLPP), in which signaling messages within a session can be associated with one another by the involved user equipments (UEs). In some designs, at least in the case that positioning methods are supported that do not require a mutual exchange of SLPP messages associated with one another among UEs, SLPP session-less operation can be supported. As used herein, “session-less” operation refers to operation where the participants are not expressly coordinated in advance (e.g., without necessarily performing discovery and setup first). From RAN2 perspective, in some designs, if it is determined to support group positioning, it is feasible to perform at least ranging with the estimate calculation at multiple UEs.

[0032] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. Aspects of the disclosure are directed to a session-less SL-based position estimation procedure, whereby a device multicasts / broadcasts a message requesting SL-PRS transmission by nearby UE(s) and which further includes SL-PRS assistance data for the SL-PRS transmission. The message facilitates the UE(s) to select a set of SL-PRS transmission parameters from a set of SL- PRS transmission parameter options, either pseudo-randomly or deterministically (i.e., rule-based), based on message-specific information. Such aspects may provide various technical advantages, such as low-latency position estimation that does not require a session to be setup before being initiated (e.g., particularly useful for UEs with high mobility, such as V2X use cases). 6 QC2303292WOQualcomm Ref. No.2303292WO

[0033] The words “exemplary” and / or “example” are used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” and / or “example” is not necessarily to be construed as preferred or advantageous over other aspects. Likewise, the term “aspects of the disclosure” does not require that all aspects of the disclosure include the discussed feature, advantage or mode of operation.

[0034] Those of skill in the art will appreciate that the information and signals described below may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description below may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof, depending in part on the particular application, in part on the desired design, in part on the corresponding technology, etc.

[0035] Further, many aspects are described in terms of sequences of actions to be performed by, for example, elements of a computing device. It will be recognized that various actions described herein can be performed by specific circuits (e.g., application specific integrated circuits (ASICs)), by program instructions being executed by one or more processors, or by a combination of both. Additionally, the sequence(s) of actions described herein can be considered to be embodied entirely within any form of non- transitory computer-readable storage medium having stored therein a corresponding set of computer instructions that, upon execution, would cause or instruct an associated processor of a device to perform the functionality described herein. Thus, the various aspects of the disclosure may be embodied in a number of different forms, all of which have been contemplated to be within the scope of the claimed subject matter. In addition, for each of the aspects described herein, the corresponding form of any such aspects may be described herein as, for example, “logic configured to” perform the described action.

[0036] As used herein, the terms “user equipment” (UE) and “base station” are not intended to be specific or otherwise limited to any particular radio access technology (RAT), unless otherwise noted. In general, a UE may be any wireless communication device (e.g., a mobile phone, router, tablet computer, laptop computer, consumer asset locating device, wearable (e.g., smartwatch, glasses, augmented reality (AR) / virtual reality (VR) headset, etc.), vehicle (e.g., automobile, motorcycle, bicycle, etc.), Internet of Things (IoT) device, etc.) used by a user to communicate over a wireless communications network. A UE may QC2303292WOQualcomm Ref. No.2303292WO be mobile or may (e.g., at certain times) be stationary, and may communicate with a radio access network (RAN). As used herein, the term “UE” may be referred to interchangeably as an “access terminal” or “AT,” a “client device,” a “wireless device,” a “subscriber device,” a “subscriber terminal,” a “subscriber station,” a “user terminal” or “UT,” a “mobile device,” a “mobile terminal,” a “mobile station,” or variations thereof. Generally, UEs can communicate with a core network via a RAN, and through the core network the UEs can be connected with external networks such as the Internet and with other UEs. Of course, other mechanisms of connecting to the core network and / or the Internet are also possible for the UEs, such as over wired access networks, wireless local area network (WLAN) networks (e.g., based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 specification, etc.) and so on.

[0037] A base station may operate according to one of several RATs in communication with UEs depending on the network in which it is deployed, and may be alternatively referred to as an access point (AP), a network node, a NodeB, an evolved NodeB (eNB), a next generation eNB (ng-eNB), a New Radio (NR) Node B (also referred to as a gNB or gNodeB), etc. A base station may be used primarily to support wireless access by UEs, including supporting data, voice, and / or signaling connections for the supported UEs. In some systems a base station may provide purely edge node signaling functions while in other systems it may provide additional control and / or network management functions. A communication link through which UEs can send signals to a base station is called an uplink (UL) channel (e.g., a reverse traffic channel, a reverse control channel, an access channel, etc.). A communication link through which the base station can send signals to UEs is called a downlink (DL) or forward link channel (e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc.). As used herein the term traffic channel (TCH) can refer to either an uplink / reverse or downlink / forward traffic channel.

[0038] The term “base station” may refer to a single physical transmission-reception point (TRP) or to multiple physical TRPs that may or may not be co-located. For example, where the term “base station” refers to a single physical TRP, the physical TRP may be an antenna of the base station corresponding to a cell (or several cell sectors) of the base station. Where the term “base station” refers to multiple co-located physical TRPs, the physical TRPs may be an array of antennas (e.g., as in a multiple-input multiple-output (MIMO) 8 QC2303292WOQualcomm Ref. No.2303292WO system or where the base station employs beamforming) of the base station. Where the term “base station” refers to multiple non-co-located physical TRPs, the physical TRPs may be a distributed antenna system (DAS) (a network of spatially separated antennas connected to a common source via a transport medium) or a remote radio head (RRH) (a remote base station connected to a serving base station). Alternatively, the non-co-located physical TRPs may be the serving base station receiving the measurement report from the UE and a neighbor base station whose reference radio frequency (RF) signals the UE is measuring. Because a TRP is the point from which a base station transmits and receives wireless signals, as used herein, references to transmission from or reception at a base station are to be understood as referring to a particular TRP of the base station.

[0039] In some implementations that support positioning of UEs, a base station may not support wireless access by UEs (e.g., may not support data, voice, and / or signaling connections for UEs), but may instead transmit reference signals to UEs to be measured by the UEs, and / or may receive and measure signals transmitted by the UEs. Such a base station may be referred to as a positioning beacon (e.g., when transmitting signals to UEs) and / or as a location measurement unit (e.g., when receiving and measuring signals from UEs).

[0040] An “RF signal” comprises an electromagnetic wave of a given frequency that transports information through the space between a transmitter and a receiver. As used herein, a transmitter may transmit a single “RF signal” or multiple “RF signals” to a receiver. However, the receiver may receive multiple “RF signals” corresponding to each transmitted RF signal due to the propagation characteristics of RF signals through multipath channels. The same transmitted RF signal on different paths between the transmitter and receiver may be referred to as a “multipath” RF signal. As used herein, an RF signal may also be referred to as a “wireless signal” or simply a “signal” where it is clear from the context that the term “signal” refers to a wireless signal or an RF signal.

[0041] FIG.1 illustrates an example wireless communications system 100, according to aspects of the disclosure. The wireless communications system 100 (which may also be referred to as a wireless wide area network (WWAN)) may include various base stations 102 (labeled “BS”) and various UEs 104. The base stations 102 may include macro cell base stations (high power cellular base stations) and / or small cell base stations (low power cellular base stations). In an aspect, the macro cell base stations may include eNBs and / or ng-eNBs where the wireless communications system 100 corresponds to an LTE network, 9 QC2303292WOQualcomm Ref. No.2303292WO or gNBs where the wireless communications system 100 corresponds to a NR network, or a combination of both, and the small cell base stations may include femtocells, picocells, microcells, etc.

[0042] The base stations 102 may collectively form a RAN and interface with a core network 170 (e.g., an evolved packet core (EPC) or a 5G core (5GC)) through backhaul links 122, and through the core network 170 to one or more location servers 172 (e.g., a location management function (LMF) or a secure user plane location (SUPL) location platform (SLP)). The location server(s) 172 may be part of core network 170 or may be external to core network 170. A location server 172 may be integrated with a base station 102. A UE 104 may communicate with a location server 172 directly or indirectly. For example, a UE 104 may communicate with a location server 172 via the base station 102 that is currently serving that UE 104. A UE 104 may also communicate with a location server 172 through another path, such as via an application server (not shown), via another network, such as via a wireless local area network (WLAN) access point (AP) (e.g., AP 150 described below), and so on. For signaling purposes, communication between a UE 104 and a location server 172 may be represented as an indirect connection (e.g., through the core network 170, etc.) or a direct connection (e.g., as shown via direct connection 128), with the intervening nodes (if any) omitted from a signaling diagram for clarity.

[0043] In addition to other functions, the base stations 102 may perform functions that relate to one or more of transferring user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, RAN sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 may communicate with each other directly or indirectly (e.g., through the EPC / 5GC) over backhaul links 134, which may be wired or wireless.

[0044] The base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. In an aspect, one or more cells may be supported by a base station 102 in each geographic coverage area 110. A “cell” is a logical communication entity used for QC2303292WOQualcomm Ref. No.2303292WO communication with a base station (e.g., over some frequency resource, referred to as a carrier frequency, component carrier, carrier, band, or the like), and may be associated with an identifier (e.g., a physical cell identifier (PCI), an enhanced cell identifier (ECI), a virtual cell identifier (VCI), a cell global identifier (CGI), etc.) for distinguishing cells operating via the same or a different carrier frequency. In some cases, different cells may be configured according to different protocol types (e.g., machine-type communication (MTC), narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB), or others) that may provide access for different types of UEs. Because a cell is supported by a specific base station, the term “cell” may refer to either or both of the logical communication entity and the base station that supports it, depending on the context. In addition, because a TRP is typically the physical transmission point of a cell, the terms “cell” and “TRP” may be used interchangeably. In some cases, the term “cell” may also refer to a geographic coverage area of a base station (e.g., a sector), insofar as a carrier frequency can be detected and used for communication within some portion of geographic coverage areas 110.

[0045] While neighboring macro cell base station 102 geographic coverage areas 110 may partially overlap (e.g., in a handover region), some of the geographic coverage areas 110 may be substantially overlapped by a larger geographic coverage area 110. For example, a small cell base station 102' (labeled “SC” for “small cell”) may have a geographic coverage area 110' that substantially overlaps with the geographic coverage area 110 of one or more macro cell base stations 102. A network that includes both small cell and macro cell base stations may be known as a heterogeneous network. A heterogeneous network may also include home eNBs (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG).

[0046] The communication links 120 between the base stations 102 and the UEs 104 may include uplink (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and / or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104. The communication links 120 may use MIMO antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. The communication links 120 may be through one or more carrier frequencies. Allocation of carriers may be asymmetric with respect to downlink and uplink (e.g., more or less carriers may be allocated for downlink than for uplink). QC2303292WOQualcomm Ref. No.2303292WO

[0047] The wireless communications system 100 may further include a wireless local area network (WLAN) access point (AP) 150 in communication with WLAN stations (STAs) 152 via communication links 154 in an unlicensed frequency spectrum (e.g., 5 GHz). When communicating in an unlicensed frequency spectrum, the WLAN STAs 152 and / or the WLAN AP 150 may perform a clear channel assessment (CCA) or listen before talk (LBT) procedure prior to communicating in order to determine whether the channel is available.

[0048] The small cell base station 102' may operate in a licensed and / or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell base station 102' may employ LTE or NR technology and use the same 5 GHz unlicensed frequency spectrum as used by the WLAN AP 150. The small cell base station 102', employing LTE / 5G in an unlicensed frequency spectrum, may boost coverage to and / or increase capacity of the access network. NR in unlicensed spectrum may be referred to as NR-U. LTE in an unlicensed spectrum may be referred to as LTE-U, licensed assisted access (LAA), or MULTEFIRE®.

[0049] The wireless communications system 100 may further include a millimeter wave (mmW) base station 180 that may operate in mmW frequencies and / or near mmW frequencies in communication with a UE 182. Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in this band may be referred to as a millimeter wave. Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW / near mmW radio frequency band have high path loss and a relatively short range. The mmW base station 180 and the UE 182 may utilize beamforming (transmit and / or receive) over a mmW communication link 184 to compensate for the extremely high path loss and short range. Further, it will be appreciated that in alternative configurations, one or more base stations 102 may also transmit using mmW or near mmW and beamforming. Accordingly, it will be appreciated that the foregoing illustrations are merely examples and should not be construed to limit the various aspects disclosed herein.

[0050] Transmit beamforming is a technique for focusing an RF signal in a specific direction. Traditionally, when a network node (e.g., a base station) broadcasts an RF signal, it QC2303292WOQualcomm Ref. No.2303292WO broadcasts the signal in all directions (omni-directionally). With transmit beamforming, the network node determines where a given target device (e.g., a UE) is located (relative to the transmitting network node) and projects a stronger downlink RF signal in that specific direction, thereby providing a faster (in terms of data rate) and stronger RF signal for the receiving device(s). To change the directionality of the RF signal when transmitting, a network node can control the phase and relative amplitude of the RF signal at each of the one or more transmitters that are broadcasting the RF signal. For example, a network node may use an array of antennas (referred to as a “phased array” or an “antenna array”) that creates a beam of RF waves that can be “steered” to point in different directions, without actually moving the antennas. Specifically, the RF current from the transmitter is fed to the individual antennas with the correct phase relationship so that the radio waves from the separate antennas add together to increase the radiation in a desired direction, while cancelling to suppress radiation in undesired directions.

[0051] Transmit beams may be quasi-co-located, meaning that they appear to the receiver (e.g., a UE) as having the same parameters, regardless of whether or not the transmitting antennas of the network node themselves are physically co-located. In NR, there are four types of quasi-co-location (QCL) relations. Specifically, a QCL relation of a given type means that certain parameters about a second reference RF signal on a second beam can be derived from information about a source reference RF signal on a source beam. Thus, if the source reference RF signal is QCL Type A, the receiver can use the source reference RF signal to estimate the Doppler shift, Doppler spread, average delay, and delay spread of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type B, the receiver can use the source reference RF signal to estimate the Doppler shift and Doppler spread of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type C, the receiver can use the source reference RF signal to estimate the Doppler shift and average delay of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type D, the receiver can use the source reference RF signal to estimate the spatial receive parameter of a second reference RF signal transmitted on the same channel.

[0052] In receive beamforming, the receiver uses a receive beam to amplify RF signals detected on a given channel. For example, the receiver can increase the gain setting and / or adjust the phase setting of an array of antennas in a particular direction to amplify (e.g., to QC2303292WOQualcomm Ref. No.2303292WO increase the gain level of) the RF signals received from that direction. Thus, when a receiver is said to beamform in a certain direction, it means the beam gain in that direction is high relative to the beam gain along other directions, or the beam gain in that direction is the highest compared to the beam gain in that direction of all other receive beams available to the receiver. This results in a stronger received signal strength (e.g., reference signal received power (RSRP), reference signal received quality (RSRQ), signal-to- interference-plus-noise ratio (SINR), etc.) of the RF signals received from that direction.

[0053] Transmit and receive beams may be spatially related. A spatial relation means that parameters for a second beam (e.g., a transmit or receive beam) for a second reference signal can be derived from information about a first beam (e.g., a receive beam or a transmit beam) for a first reference signal. For example, a UE may use a particular receive beam to receive a reference downlink reference signal (e.g., synchronization signal block (SSB)) from a base station. The UE can then form a transmit beam for sending an uplink reference signal (e.g., sounding reference signal (SRS)) to that base station based on the parameters of the receive beam.

[0054] Note that a “downlink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the downlink beam to transmit a reference signal to a UE, the downlink beam is a transmit beam. If the UE is forming the downlink beam, however, it is a receive beam to receive the downlink reference signal. Similarly, an “uplink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the uplink beam, it is an uplink receive beam, and if a UE is forming the uplink beam, it is an uplink transmit beam.

[0055] 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). It should be understood that 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 referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) QC2303292WOQualcomm Ref. No.2303292WO band (30 GHz – 300 GHz) which is identified by the INTERNATIONAL TELECOMMUNICATION UNION® as a “millimeter wave” band.

[0056] 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 mid-band 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 FR4a or FR4-1 (52.6 GHz – 71 GHz), FR4 (52.6 GHz – 114.25 GHz), and FR5 (114.25 GHz – 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0057] With the above aspects in mind, unless specifically stated otherwise, it should be understood that 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, it should be understood that 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, FR4-a or FR4-1, and / or FR5, or may be within the EHF band.

[0058] In a multi-carrier system, such as 5G, one of the carrier frequencies is referred to as the “primary carrier” or “anchor carrier” or “primary serving cell” or “PCell,” and the remaining carrier frequencies are referred to as “secondary carriers” or “secondary serving cells” or “SCells.” In carrier aggregation, the anchor carrier is the carrier operating on the primary frequency (e.g., FR1) utilized by a UE 104 / 182 and the cell in which the UE 104 / 182 either performs the initial radio resource control (RRC) connection establishment procedure or initiates the RRC connection re-establishment procedure. The primary carrier carries all common and UE-specific control channels, and may be a carrier in a licensed frequency (however, this is not always the case). A secondary carrier is a carrier operating on a second frequency (e.g., FR2) that may be configured once the RRC connection is established between the UE 104 and the anchor carrier and that may be used to provide additional radio resources. In some cases, the secondary carrier may be a carrier in an unlicensed frequency. The secondary carrier may contain only necessary QC2303292WOQualcomm Ref. No.2303292WO signaling information and signals, for example, those that are UE-specific may not be present in the secondary carrier, since both primary uplink and downlink carriers are typically UE-specific. This means that different UEs 104 / 182 in a cell may have different downlink primary carriers. The same is true for the uplink primary carriers. The network is able to change the primary carrier of any UE 104 / 182 at any time. This is done, for example, to balance the load on different carriers. Because a “serving cell” (whether a PCell or an SCell) corresponds to a carrier frequency / component carrier over which some base station is communicating, the term “cell,” “serving cell,” “component carrier,” “carrier frequency,” and the like can be used interchangeably.

[0059] For example, still referring to FIG. 1, one of the frequencies utilized by the macro cell base stations 102 may be an anchor carrier (or “PCell”) and other frequencies utilized by the macro cell base stations 102 and / or the mmW base station 180 may be secondary carriers (“SCells”). The simultaneous transmission and / or reception of multiple carriers enables the UE 104 / 182 to significantly increase its data transmission and / or reception rates. For example, two 20 MHz aggregated carriers in a multi-carrier system would theoretically lead to a two-fold increase in data rate (i.e., 40 MHz), compared to that attained by a single 20 MHz carrier.

[0060] The wireless communications system 100 may further include a UE 164 that may communicate with a macro cell base station 102 over a communication link 120 and / or the mmW base station 180 over a mmW communication link 184. For example, the macro cell base station 102 may support a PCell and one or more SCells for the UE 164 and the mmW base station 180 may support one or more SCells for the UE 164.

[0061] In some cases, the UE 164 and the UE 182 may be capable of sidelink communication. Sidelink-capable UEs (SL-UEs) may communicate with base stations 102 over communication links 120 using the Uu interface (i.e., the air interface between a UE and a base station). SL-UEs (e.g., UE 164, UE 182) may also communicate directly with each other over a wireless sidelink 160 using the PC5 interface (i.e., the air interface between sidelink-capable UEs). A wireless sidelink (or just “sidelink”) is an adaptation of the core cellular (e.g., LTE, NR) standard that allows direct communication between two or more UEs without the communication needing to go through a base station. Sidelink communication may be unicast or multicast, and may be used for device-to-device (D2D) media-sharing, vehicle-to-vehicle (V2V) communication, vehicle-to-everything (V2X) QC2303292WOQualcomm Ref. No.2303292WO communication (e.g., cellular V2X (cV2X) communication, enhanced V2X (eV2X) communication, etc.), emergency rescue applications, etc. One or more of a group of SL- UEs utilizing sidelink communications may be within the geographic coverage area 110 of a base station 102. Other SL-UEs in such a group may be outside the geographic coverage area 110 of a base station 102 or be otherwise unable to receive transmissions from a base station 102. In some cases, groups of SL-UEs communicating via sidelink communications may utilize a one-to-many (1:M) system in which each SL-UE transmits to every other SL-UE in the group. In some cases, a base station 102 facilitates the scheduling of resources for sidelink communications. In other cases, sidelink communications are carried out between SL-UEs without the involvement of a base station 102.

[0062] In an aspect, the sidelink 160 may operate over a wireless communication medium of interest, which may be shared with other wireless communications between other vehicles and / or infrastructure access points, as well as other RATs. A “medium” may be composed of one or more time, frequency, and / or space communication resources (e.g., encompassing one or more channels across one or more carriers) associated with wireless communication between one or more transmitter / receiver pairs. In an aspect, the medium of interest may correspond to at least a portion of an unlicensed frequency band shared among various RATs. Although different licensed frequency bands have been reserved for certain communication systems (e.g., by a government entity such as the Federal Communications Commission (FCC) in the United States), these systems, in particular those employing small cell access points, have recently extended operation into unlicensed frequency bands such as the Unlicensed National Information Infrastructure (U-NII) band used by wireless local area network (WLAN) technologies, most notably IEEE 802.11x WLAN technologies generally referred to as “Wi-Fi.” Example systems of this type include different variants of CDMA systems, TDMA systems, FDMA systems, orthogonal FDMA (OFDMA) systems, single-carrier FDMA (SC-FDMA) systems, and so on.

[0063] Note that although FIG. 1 only illustrates two of the UEs as SL-UEs (i.e., UEs 164 and 182), any of the illustrated UEs may be SL-UEs. Further, although only UE 182 was described as being capable of beamforming, any of the illustrated UEs, including UE 164, may be capable of beamforming. Where SL-UEs are capable of beamforming, they may QC2303292WOQualcomm Ref. No.2303292WO beamform towards each other (i.e., towards other SL-UEs), towards other UEs (e.g., UEs 104), towards base stations (e.g., base stations 102, 180, small cell 102’, access point 150), etc. Thus, in some cases, UEs 164 and 182 may utilize beamforming over sidelink 160.

[0064] In the example of FIG.1, any of the illustrated UEs (shown in FIG.1 as a single UE 104 for simplicity) may receive signals 124 from one or more Earth orbiting space vehicles (SVs) 112 (e.g., satellites). In an aspect, the SVs 112 may be part of a satellite positioning system that a UE 104 can use as an independent source of location information. A satellite positioning system typically includes a system of transmitters (e.g., SVs 112) positioned to enable receivers (e.g., UEs 104) to determine their location on or above the Earth based, at least in part, on positioning signals (e.g., signals 124) received from the transmitters. Such a transmitter typically transmits a signal marked with a repeating pseudo-random noise (PN) code of a set number of chips. While typically located in SVs 112, transmitters may sometimes be located on ground-based control stations, base stations 102, and / or other UEs 104. A UE 104 may include one or more dedicated receivers specifically designed to receive signals 124 for deriving geo location information from the SVs 112.

[0065] In a satellite positioning system, the use of signals 124 can be augmented by various satellite-based augmentation systems (SBAS) that may be associated with or otherwise enabled for use with one or more global and / or regional navigation satellite systems. For example an SBAS may include an augmentation system(s) that provides integrity information, differential corrections, etc., such as the Wide Area Augmentation System (WAAS), the European Geostationary Navigation Overlay Service (EGNOS), the Multi- functional Satellite Augmentation System (MSAS), the Global Positioning System (GPS) Aided Geo Augmented Navigation or GPS and Geo Augmented Navigation system (GAGAN), and / or the like. Thus, as used herein, a satellite positioning system may include any combination of one or more global and / or regional navigation satellites associated with such one or more satellite positioning systems.

[0066] In an aspect, SVs 112 may additionally or alternatively be part of one or more non- terrestrial networks (NTNs). In an NTN, an SV 112 is connected to an earth station (also referred to as a ground station, NTN gateway, or gateway), which in turn is connected to an element in a 5G network, such as a modified base station 102 (without a terrestrial antenna) or a network node in a 5GC. This element would in turn provide access to other QC2303292WOQualcomm Ref. No.2303292WO elements in the 5G network and ultimately to entities external to the 5G network, such as Internet web servers and other user devices. In that way, a UE 104 may receive communication signals (e.g., signals 124) from an SV 112 instead of, or in addition to, communication signals from a terrestrial base station 102.

[0067] The wireless communications system 100 may further include one or more UEs, such as UE 190, that connects indirectly to one or more communication networks via one or more device-to-device (D2D) peer-to-peer (P2P) links (referred to as “sidelinks”). In the example of FIG. 1, UE 190 has a D2D P2P link 192 with one of the UEs 104 connected to one of the base stations 102 (e.g., through which UE 190 may indirectly obtain cellular connectivity) and a D2D P2P link 194 with WLAN STA 152 connected to the WLAN AP 150 (through which UE 190 may indirectly obtain WLAN-based Internet connectivity). In an example, the D2D P2P links 192 and 194 may be supported with any well-known D2D RAT, such as LTE Direct (LTE-D), WI-FI DIRECT®, BLUETOOTH®, and so on.

[0068] FIG.2A illustrates an example wireless network structure 200. For example, a 5GC 210 (also referred to as a Next Generation Core (NGC)) can be viewed functionally as control plane (C-plane) functions 214 (e.g., UE registration, authentication, network access, gateway selection, etc.) and user plane (U-plane) functions 212, (e.g., UE gateway function, access to data networks, IP routing, etc.) which operate cooperatively to form the core network. User plane interface (NG-U) 213 and control plane interface (NG-C) 215 connect the gNB 222 to the 5GC 210 and specifically to the user plane functions 212 and control plane functions 214, respectively. In an additional configuration, an ng-eNB 224 may also be connected to the 5GC 210 via NG-C 215 to the control plane functions 214 and NG-U 213 to user plane functions 212. Further, ng-eNB 224 may directly communicate with gNB 222 via a backhaul connection 223. In some configurations, a Next Generation RAN (NG-RAN) 220 may have one or more gNBs 222, while other configurations include one or more of both ng-eNBs 224 and gNBs 222. Either (or both) gNB 222 or ng-eNB 224 may communicate with one or more UEs 204 (e.g., any of the UEs described herein).

[0069] Another optional aspect may include a location server 230, which may be in communication with the 5GC 210 to provide location assistance for UE(s) 204. The location server 230 can be implemented as a plurality of separate servers (e.g., physically QC2303292WOQualcomm Ref. No.2303292WO 20 separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc.), or alternately may each correspond to a single server. The location server 230 can be configured to support one or more location services for UEs 204 that can connect to the location server 230 via the core network, 5GC 210, and / or via the Internet (not illustrated). Further, the location server 230 may be integrated into a component of the core network, or alternatively may be external to the core network (e.g., a third party server, such as an original equipment manufacturer (OEM) server or service server).

[0070] FIG.2B illustrates another example wireless network structure 240. A 5GC 260 (which may correspond to 5GC 210 in FIG. 2A) can be viewed functionally as control plane functions, provided by an access and mobility management function (AMF) 264, and user plane functions, provided by a user plane function (UPF) 262, which operate cooperatively to form the core network (i.e., 5GC 260). The functions of the AMF 264 include registration management, connection management, reachability management, mobility management, lawful interception, transport for session management (SM) messages between one or more UEs 204 (e.g., any of the UEs described herein) and a session management function (SMF) 266, transparent proxy services for routing SM messages, access authentication and access authorization, transport for short message service (SMS) messages between the UE 204 and the short message service function (SMSF) (not shown), and security anchor functionality (SEAF). The AMF 264 also interacts with an authentication server function (AUSF) (not shown) and the UE 204, and receives the intermediate key that was established as a result of the UE 204 authentication process. In the case of authentication based on a UMTS (universal mobile telecommunications system) subscriber identity module (USIM), the AMF 264 retrieves the security material from the AUSF. The functions of the AMF 264 also include security context management (SCM). The SCM receives a key from the SEAF that it uses to derive access-network specific keys. The functionality of the AMF 264 also includes location services management for regulatory services, transport for location services messages between the UE 204 and a location management function (LMF) 270 (which acts as a location server 230), transport for location services messages between the NG-RAN 220 and the LMF 270, evolved packet system (EPS) bearer identifier allocation for interworking with the EPS, and UE 204 mobility event notification. In addition, the AMF QC2303292WOQualcomm Ref. No.2303292WO 264 also supports functionalities for non-3GPP® (Third Generation Partnership Project) access networks.

[0071] Functions of the UPF 262 include acting as an anchor point for intra / inter-RAT mobility (when applicable), acting as an external protocol data unit (PDU) session point of interconnect to a data network (not shown), providing packet routing and forwarding, packet inspection, user plane policy rule enforcement (e.g., gating, redirection, traffic steering), lawful interception (user plane collection), traffic usage reporting, quality of service (QoS) handling for the user plane (e.g., uplink / downlink rate enforcement, reflective QoS marking in the downlink), uplink traffic verification (service data flow (SDF) to QoS flow mapping), transport level packet marking in the uplink and downlink, downlink packet buffering and downlink data notification triggering, and sending and forwarding of one or more “end markers” to the source RAN node. The UPF 262 may also support transfer of location services messages over a user plane between the UE 204 and a location server, such as an SLP 272.

[0072] The functions of the SMF 266 include session management, UE Internet protocol (IP) address allocation and management, selection and control of user plane functions, configuration of traffic steering at the UPF 262 to route traffic to the proper destination, control of part of policy enforcement and QoS, and downlink data notification. The interface over which the SMF 266 communicates with the AMF 264 is referred to as the N11 interface.

[0073] Another optional aspect may include an LMF 270, which may be in communication with the 5GC 260 to provide location assistance for UEs 204. The LMF 270 can be implemented as a plurality of separate servers (e.g., physically separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc.), or alternately may each correspond to a single server. The LMF 270 can be configured to support one or more location services for UEs 204 that can connect to the LMF 270 via the core network, 5GC 260, and / or via the Internet (not illustrated). The SLP 272 may support similar functions to the LMF 270, but whereas the LMF 270 may communicate with the AMF 264, NG-RAN 220, and UEs 204 over a control plane (e.g., using interfaces and protocols intended to convey signaling messages and not voice or data), the SLP 272 may communicate with UEs 204 and external clients QC2303292WOQualcomm Ref. No.2303292WO (e.g., third-party server 274) over a user plane (e.g., using protocols intended to carry voice and / or data like the transmission control protocol (TCP) and / or IP).

[0074] Yet another optional aspect may include a third-party server 274, which may be in communication with the LMF 270, the SLP 272, the 5GC 260 (e.g., via the AMF 264 and / or the UPF 262), the NG-RAN 220, and / or the UE 204 to obtain location information (e.g., a location estimate) for the UE 204. As such, in some cases, the third-party server 274 may be referred to as a location services (LCS) client or an external client. The third- party server 274 can be implemented as a plurality of separate servers (e.g., physically separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc.), or alternately may each correspond to a single server.

[0075] User plane interface 263 and control plane interface 265 connect the 5GC 260, and specifically the UPF 262 and AMF 264, respectively, to one or more gNBs 222 and / or ng-eNBs 224 in the NG-RAN 220. The interface between gNB(s) 222 and / or ng-eNB(s) 224 and the AMF 264 is referred to as the “N2” interface, and the interface between gNB(s) 222 and / or ng-eNB(s) 224 and the UPF 262 is referred to as the “N3” interface. The gNB(s) 222 and / or ng-eNB(s) 224 of the NG-RAN 220 may communicate directly with each other via backhaul connections 223, referred to as the “Xn-C” interface. One or more of gNBs 222 and / or ng-eNBs 224 may communicate with one or more UEs 204 over a wireless interface, referred to as the “Uu” interface.

[0076] The functionality of a gNB 222 may be divided between a gNB central unit (gNB-CU) 226, one or more gNB distributed units (gNB-DUs) 228, and one or more gNB radio units (gNB-RUs) 229. A gNB-CU 226 is a logical node that includes the base station functions of transferring user data, mobility control, radio access network sharing, positioning, session management, and the like, except for those functions allocated exclusively to the gNB-DU(s) 228. More specifically, the gNB-CU 226 generally host the radio resource control (RRC), service data adaptation protocol (SDAP), and packet data convergence protocol (PDCP) protocols of the gNB 222. A gNB-DU 228 is a logical node that generally hosts the radio link control (RLC) and medium access control (MAC) layer of the gNB 222. Its operation is controlled by the gNB-CU 226. One gNB-DU 228 can support one or more cells, and one cell is supported by only one gNB-DU 228. The interface 232 between the gNB-CU 226 and the one or more gNB-DUs 228 is referred to QC2303292WOQualcomm Ref. No.2303292WO 23 as the “F1” interface. The physical (PHY) layer functionality of a gNB 222 is generally hosted by one or more standalone gNB-RUs 229 that perform functions such as power amplification and signal transmission / reception. The interface between a gNB-DU 228 and a gNB-RU 229 is referred to as the “Fx” interface. Thus, a UE 204 communicates with the gNB-CU 226 via the RRC, SDAP, and PDCP layers, with a gNB-DU 228 via the RLC and MAC layers, and with a gNB-RU 229 via the PHY layer.

[0077] 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 RAN node, a core network node, a network element, or a network equipment, such as a base station, 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 base station (such as a Node B (NB), evolved NB (eNB), NR base station, 5G NB, access point (AP), a transmit receive point (TRP), or a cell, etc.) may be implemented as an aggregated base station (also known as a standalone base station or a monolithic base station) or a disaggregated base station.

[0078] 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 base station 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 also can be implemented as virtual units, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0079] Base station-type 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 QC2303292WOQualcomm Ref. No.2303292WO 24 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.

[0080] FIG. 2C illustrates an example disaggregated base station architecture 250, according to aspects of the disclosure. The disaggregated base station architecture 250 may include one or more central units (CUs) 280 (e.g., gNB-CU 226) that can communicate directly with a core network 267 (e.g., 5GC 210, 5GC 260) via a backhaul link, or indirectly with the core network 267 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 259 via an E2 link, or a Non-Real Time (Non-RT) RIC 257 associated with a Service Management and Orchestration (SMO) Framework 255, or both). A CU 280 may communicate with one or more DUs 285 (e.g., gNB-DUs 228) via respective midhaul links, such as an F1 interface. The DUs 285 may communicate with one or more radio units (RUs) 287 (e.g., gNB-RUs 229) via respective fronthaul links. The RUs 287 may communicate with respective UEs 204 via one or more radio frequency (RF) access links. In some implementations, the UE 204 may be simultaneously served by multiple RUs 287.

[0081] Each of the units, i.e., the CUs 280, the DUs 285, the RUs 287, as well as the Near-RT RICs 259, the Non-RT RICs 257 and the SMO Framework 255, may include one or more interfaces or be coupled to one or more interfaces configured to receive or 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 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 transceiver (such as a RF transceiver), configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.

[0082] In some aspects, the CU 280 may host one or more higher layer control functions. Such control functions can include RRC, PDCP, service data adaptation protocol (SDAP), or the like. Each control function can be implemented with an interface configured to QC2303292WOQualcomm Ref. No.2303292WO communicate signals with other control functions hosted by the CU 280. The CU 280 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 280 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 the E1 interface when implemented in an O-RAN configuration. The CU 280 can be implemented to communicate with the DU 285, as necessary, for network control and signaling.

[0083] The DU 285 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 287. In some aspects, the DU 285 may host one or more of a RLC layer, a MAC layer, and one or more high PHY layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, or the like) depending, at least in part, on a functional split, such as those defined by the 3rd Generation Partnership Project (3GPP®). In some aspects, the DU 285 may further host one or more low 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 285, or with the control functions hosted by the CU 280.

[0084] Lower-layer functionality can be implemented by one or more RUs 287. In some deployments, an RU 287, controlled by a DU 285, 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) 287 can be implemented to handle over the air (OTA) communication with one or more UEs 204. In some implementations, real-time and non-real-time aspects of control and user plane communication with the RU(s) 287 can be controlled by the corresponding DU 285. In some scenarios, this configuration can enable the DU(s) 285 and the CU 280 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture. QC2303292WOQualcomm Ref. No.2303292WO

[0085] The SMO Framework 255 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 255 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements which may be managed via an operations and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO Framework 255 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 269) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements can include, but are not limited to, CUs 280, DUs 285, RUs 287 and Near-RT RICs 259. In some implementations, the SMO Framework 255 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 261, via an O1 interface. Additionally, in some implementations, the SMO Framework 255 can communicate directly with one or more RUs 287 via an O1 interface. The SMO Framework 255 also may include a Non-RT RIC 257 configured to support functionality of the SMO Framework 255.

[0086] The Non-RT RIC 257 may be configured to include a logical function that enables non- real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updates, or policy-based guidance of applications / features in the Near-RT RIC 259. The Non-RT RIC 257 may be coupled to or communicate with (such as via an A1 interface) the Near- RT RIC 259. The Near-RT RIC 259 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 280, one or more DUs 285, or both, as well as an O-eNB, with the Near-RT RIC 259.

[0087] In some implementations, to generate AI / ML models to be deployed in the Near-RT RIC 259, the Non-RT RIC 257 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 259 and may be received at the SMO Framework 255 or the Non-RT RIC 257 from non-network data sources or from network functions. In some examples, the Non-RT RIC 257 or the Near-RT RIC 259 may be configured to tune RAN behavior or performance. For QC2303292WOQualcomm Ref. No.2303292WO 27 example, the Non-RT RIC 257 may monitor long-term trends and patterns for performance and employ AI / ML models to perform corrective actions through the SMO Framework 255 (such as reconfiguration via O1) or via creation of RAN management policies (such as A1 policies).

[0088] FIGS. 3A, 3B, and 3C illustrate several example components (represented by corresponding blocks) that may be incorporated into a UE 302 (which may correspond to any of the UEs described herein), a base station 304 (which may correspond to any of the base stations described herein), and a network entity 306 (which may correspond to or embody any of the network functions described herein, including the location server 230 and the LMF 270, or alternatively may be independent from the NG-RAN 220 and / or 5GC 210 / 260 infrastructure depicted in FIGS. 2A and 2B, such as a private network) to support the operations described herein. It will be appreciated that these components may be implemented in different types of apparatuses in different implementations (e.g., in an ASIC, in a system-on-chip (SoC), etc.). The illustrated components may also be incorporated into other apparatuses in a communication system. For example, other apparatuses in a system may include components similar to those described to provide similar functionality. Also, a given apparatus may contain one or more of the components. For example, an apparatus may include multiple transceiver components that enable the apparatus to operate on multiple carriers and / or communicate via different technologies.

[0089] The UE 302 and the base station 304 each include one or more wireless wide area network (WWAN) transceivers 310 and 350, respectively, providing means for communicating (e.g., means for transmitting, means for receiving, means for measuring, means for tuning, means for refraining from transmitting, etc.) via one or more wireless communication networks (not shown), such as an NR network, an LTE network, a GSM network, and / or the like. The WWAN transceivers 310 and 350 may each be connected to one or more antennas 316 and 356, respectively, for communicating with other network nodes, such as other UEs, access points, base stations (e.g., eNBs, gNBs), etc., via at least one designated RAT (e.g., NR, LTE, GSM, etc.) over a wireless communication medium of interest (e.g., some set of time / frequency resources in a particular frequency spectrum). The WWAN transceivers 310 and 350 may be variously configured for transmitting and encoding signals 318 and 358 (e.g., messages, indications, information, and so on), respectively, and, conversely, for receiving and decoding signals 318 and 358 (e.g., QC2303292WOQualcomm Ref. No.2303292WO 28 messages, indications, information, pilots, and so on), respectively, in accordance with the designated RAT. Specifically, the WWAN transceivers 310 and 350 include one or more transmitters 314 and 354, respectively, for transmitting and encoding signals 318 and 358, respectively, and one or more receivers 312 and 352, respectively, for receiving and decoding signals 318 and 358, respectively.

[0090] The UE 302 and the base station 304 each also include, at least in some cases, one or more short-range wireless transceivers 320 and 360, respectively. The short-range wireless transceivers 320 and 360 may be connected to one or more antennas 326 and 366, respectively, and provide means for communicating (e.g., means for transmitting, means for receiving, means for measuring, means for tuning, means for refraining from transmitting, etc.) with other network nodes, such as other UEs, access points, base stations, etc., via at least one designated RAT (e.g., Wi-Fi, LTE Direct, BLUETOOTH®, ZIGBEE®, Z-WAVE®, PC5, dedicated short-range communications (DSRC), wireless access for vehicular environments (WAVE), near-field communication (NFC), ultra- wideband (UWB), etc.) over a wireless communication medium of interest. The short- range wireless transceivers 320 and 360 may be variously configured for transmitting and encoding signals 328 and 368 (e.g., messages, indications, information, and so on), respectively, and, conversely, for receiving and decoding signals 328 and 368 (e.g., messages, indications, information, pilots, and so on), respectively, in accordance with the designated RAT. Specifically, the short-range wireless transceivers 320 and 360 include one or more transmitters 324 and 364, respectively, for transmitting and encoding signals 328 and 368, respectively, and one or more receivers 322 and 362, respectively, for receiving and decoding signals 328 and 368, respectively. As specific examples, the short-range wireless transceivers 320 and 360 may be Wi-Fi transceivers, BLUETOOTH® transceivers, ZIGBEE® and / or Z-WAVE® transceivers, NFC transceivers, UWB transceivers, or vehicle-to-vehicle (V2V) and / or vehicle-to- everything (V2X) transceivers.

[0091] The UE 302 and the base station 304 also include, at least in some cases, satellite signal receivers 330 and 370. The satellite signal receivers 330 and 370 may be connected to one or more antennas 336 and 376, respectively, and may provide means for receiving and / or measuring satellite positioning / communication signals 338 and 378, respectively. Where the satellite signal receivers 330 and 370 are satellite positioning system receivers, QC2303292WOQualcomm Ref. No.2303292WO the satellite positioning / communication signals 338 and 378 may be global positioning system (GPS) signals, global navigation satellite system (GLONASS®) signals, Galileo signals, Beidou signals, Indian Regional Navigation Satellite System (NAVIC), Quasi- Zenith Satellite System (QZSS), etc. Where the satellite signal receivers 330 and 370 are non-terrestrial network (NTN) receivers, the satellite positioning / communication signals 338 and 378 may be communication signals (e.g., carrying control and / or user data) originating from a 5G network. The satellite signal receivers 330 and 370 may comprise any suitable hardware and / or software for receiving and processing satellite positioning / communication signals 338 and 378, respectively. The satellite signal receivers 330 and 370 may request information and operations as appropriate from the other systems, and, at least in some cases, perform calculations to determine locations of the UE 302 and the base station 304, respectively, using measurements obtained by any suitable satellite positioning system algorithm.

[0092] The base station 304 and the network entity 306 each include one or more network transceivers 380 and 390, respectively, providing means for communicating (e.g., means for transmitting, means for receiving, etc.) with other network entities (e.g., other base stations 304, other network entities 306). For example, the base station 304 may employ the one or more network transceivers 380 to communicate with other base stations 304 or network entities 306 over one or more wired or wireless backhaul links. As another example, the network entity 306 may employ the one or more network transceivers 390 to communicate with one or more base station 304 over one or more wired or wireless backhaul links, or with other network entities 306 over one or more wired or wireless core network interfaces.

[0093] A transceiver may be configured to communicate over a wired or wireless link. A transceiver (whether a wired transceiver or a wireless transceiver) includes transmitter circuitry (e.g., transmitters 314, 324, 354, 364) and receiver circuitry (e.g., receivers 312, 322, 352, 362). A transceiver may be an integrated device (e.g., embodying transmitter circuitry and receiver circuitry in a single device) in some implementations, may comprise separate transmitter circuitry and separate receiver circuitry in some implementations, or may be embodied in other ways in other implementations. The transmitter circuitry and receiver circuitry of a wired transceiver (e.g., network transceivers 380 and 390 in some implementations) may be coupled to one or more wired network interface ports. Wireless QC2303292WOQualcomm Ref. No.2303292WO transmitter circuitry (e.g., transmitters 314, 324, 354, 364) may include or be coupled to a plurality of antennas (e.g., antennas 316, 326, 356, 366), such as an antenna array, that permits the respective apparatus (e.g., UE 302, base station 304) to perform transmit “beamforming,” as described herein. Similarly, wireless receiver circuitry (e.g., receivers 312, 322, 352, 362) may include or be coupled to a plurality of antennas (e.g., antennas 316, 326, 356, 366), such as an antenna array, that permits the respective apparatus (e.g., UE 302, base station 304) to perform receive beamforming, as described herein. In an aspect, the transmitter circuitry and receiver circuitry may share the same plurality of antennas (e.g., antennas 316, 326, 356, 366), such that the respective apparatus can only receive or transmit at a given time, not both at the same time. A wireless transceiver (e.g., WWAN transceivers 310 and 350, short-range wireless transceivers 320 and 360) may also include a network listen module (NLM) or the like for performing various measurements.

[0094] As used herein, the various wireless transceivers (e.g., transceivers 310, 320, 350, and 360, and network transceivers 380 and 390 in some implementations) and wired transceivers (e.g., network transceivers 380 and 390 in some implementations) may generally be characterized as “a transceiver,” “at least one transceiver,” or “one or more transceivers.” As such, whether a particular transceiver is a wired or wireless transceiver may be inferred from the type of communication performed. For example, backhaul communication between network devices or servers will generally relate to signaling via a wired transceiver, whereas wireless communication between a UE (e.g., UE 302) and a base station (e.g., base station 304) will generally relate to signaling via a wireless transceiver.

[0095] The UE 302, the base station 304, and the network entity 306 also include other components that may be used in conjunction with the operations as disclosed herein. The UE 302, the base station 304, and the network entity 306 include one or more processors 332, 384, and 394, respectively, for providing functionality relating to, for example, wireless communication, and for providing other processing functionality. The processors 332, 384, and 394 may therefore provide means for processing, such as means for determining, means for calculating, means for receiving, means for transmitting, means for indicating, etc. In an aspect, the processors 332, 384, and 394 may include, for example, one or more general purpose processors, multi-core processors, central QC2303292WOQualcomm Ref. No.2303292WO processing units (CPUs), ASICs, digital signal processors (DSPs), field programmable gate arrays (FPGAs), other programmable logic devices or processing circuitry, or various combinations thereof.

[0096] The UE 302, the base station 304, and the network entity 306 include memory circuitry implementing memories 340, 386, and 396 (e.g., each including a memory device), respectively, for maintaining information (e.g., information indicative of reserved resources, thresholds, parameters, and so on). The memories 340, 386, and 396 may therefore provide means for storing, means for retrieving, means for maintaining, etc. In some cases, the UE 302, the base station 304, and the network entity 306 may include sidelink positioning component 342, 388, and 398, respectively. The sidelink positioning component 342, 388, and 398 may be hardware circuits that are part of or coupled to the processors 332, 384, and 394, respectively, that, when executed, cause the UE 302, the base station 304, and the network entity 306 to perform the functionality described herein. In other aspects, the sidelink positioning component 342, 388, and 398 may be external to the processors 332, 384, and 394 (e.g., part of a modem processing system, integrated with another processing system, etc.). Alternatively, the sidelink positioning component 342, 388, and 398 may be memory modules stored in the memories 340, 386, and 396, respectively, that, when executed by the processors 332, 384, and 394 (or a modem processing system, another processing system, etc.), cause the UE 302, the base station 304, and the network entity 306 to perform the functionality described herein. FIG. 3A illustrates possible locations of the sidelink positioning component 342, which may be, for example, part of the one or more WWAN transceivers 310, the memory 340, the one or more processors 332, or any combination thereof, or may be a standalone component. FIG. 3B illustrates possible locations of the sidelink positioning component 388, which may be, for example, part of the one or more WWAN transceivers 350, the memory 386, the one or more processors 384, or any combination thereof, or may be a standalone component. FIG.3C illustrates possible locations of the sidelink positioning component 398, which may be, for example, part of the one or more network transceivers 390, the memory 396, the one or more processors 394, or any combination thereof, or may be a standalone component.

[0097] The UE 302 may include one or more sensors 344 coupled to the one or more processors 332 to provide means for sensing or detecting movement and / or orientation information QC2303292WOQualcomm Ref. No.2303292WO that is independent of motion data derived from signals received by the one or more WWAN transceivers 310, the one or more short-range wireless transceivers 320, and / or the satellite signal receiver 330. By way of example, the sensor(s) 344 may include an accelerometer (e.g., a micro-electrical mechanical systems (MEMS) device), a gyroscope, a geomagnetic sensor (e.g., a compass), an altimeter (e.g., a barometric pressure altimeter), and / or any other type of movement detection sensor. Moreover, the sensor(s) 344 may include a plurality of different types of devices and combine their outputs in order to provide motion information. For example, the sensor(s) 344 may use a combination of a multi-axis accelerometer and orientation sensors to provide the ability to compute positions in two-dimensional (2D) and / or three-dimensional (3D) coordinate systems.

[0098] In addition, the UE 302 includes a user interface 346 providing means for providing indications (e.g., audible and / or visual indications) to a user and / or for receiving user input (e.g., upon user actuation of a sensing device such a keypad, a touch screen, a microphone, and so on). Although not shown, the base station 304 and the network entity 306 may also include user interfaces.

[0099] Referring to the one or more processors 384 in more detail, in the downlink, IP packets from the network entity 306 may be provided to the processor 384. The one or more processors 384 may implement functionality for an RRC layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The one or more processors 384 may provide RRC layer functionality associated with broadcasting of system information (e.g., master information block (MIB), system information blocks (SIBs)), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-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 PDUs, error correction through automatic repeat request (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 QC2303292WOQualcomm Ref. No.2303292WO transport channels, scheduling information reporting, error correction, priority handling, and logical channel prioritization.

[0100] The transmitter 354 and the receiver 352 may implement Layer-1 (L1) 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 transmitter 354 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), 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 orthogonal frequency division multiplexing (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 symbol stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 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 302. Each spatial stream may then be provided to one or more different antennas 356. The transmitter 354 may modulate an RF carrier with a respective spatial stream for transmission.

[0101] At the UE 302, the receiver 312 receives a signal through its respective antenna(s) 316. The receiver 312 recovers information modulated onto an RF carrier and provides the information to the one or more processors 332. The transmitter 314 and the receiver 312 implement Layer-1 functionality associated with various signal processing functions. The receiver 312 may perform spatial processing on the information to recover any spatial streams destined for the UE 302. If multiple spatial streams are destined for the UE 302, they may be combined by the receiver 312 into a single OFDM symbol stream. The receiver 312 then converts the OFDM symbol stream from the time-domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The QC2303292WOQualcomm Ref. No.2303292WO 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 304. These soft decisions may be based on channel estimates computed by a channel estimator. The soft decisions are then decoded and de-interleaved to recover the data and control signals that were originally transmitted by the base station 304 on the physical channel. The data and control signals are then provided to the one or more processors 332, which implements Layer-3 (L3) and Layer-2 (L2) functionality.

[0102] In the downlink, the one or more processors 332 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the core network. The one or more processors 332 are also responsible for error detection.

[0103] Similar to the functionality described in connection with the downlink transmission by the base station 304, the one or more processors 332 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 of upper 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 transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through hybrid automatic repeat request (HARQ), priority handling, and logical channel prioritization.

[0104] Channel estimates derived by the channel estimator from a reference signal or feedback transmitted by the base station 304 may be used by the transmitter 314 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the transmitter 314 may be provided to different antenna(s) 316. The transmitter 314 may modulate an RF carrier with a respective spatial stream for transmission.

[0105] The uplink transmission is processed at the base station 304 in a manner similar to that described in connection with the receiver function at the UE 302. The receiver 352 receives a signal through its respective antenna(s) 356. The receiver 352 recovers QC2303292WOQualcomm Ref. No.2303292WO information modulated onto an RF carrier and provides the information to the one or more processors 384.

[0106] In the uplink, the one or more processors 384 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 302. IP packets from the one or more processors 384 may be provided to the core network. The one or more processors 384 are also responsible for error detection.

[0107] For convenience, the UE 302, the base station 304, and / or the network entity 306 are shown in FIGS.3A, 3B, and 3C as including various components that may be configured according to the various examples described herein. It will be appreciated, however, that the illustrated components may have different functionality in different designs. In particular, various components in FIGS. 3A to 3C are optional in alternative configurations and the various aspects include configurations that may vary due to design choice, costs, use of the device, or other considerations. For example, in case of FIG.3A, a particular implementation of UE 302 may omit the WWAN transceiver(s) 310 (e.g., a wearable device or tablet computer or personal computer (PC) or laptop may have Wi-Fi and / or BLUETOOTH® capability without cellular capability), or may omit the short- range wireless transceiver(s) 320 (e.g., cellular-only, etc.), or may omit the satellite signal receiver 330, or may omit the sensor(s) 344, and so on. In another example, in case of FIG. 3B, a particular implementation of the base station 304 may omit the WWAN transceiver(s) 350 (e.g., a Wi-Fi “hotspot” access point without cellular capability), or may omit the short-range wireless transceiver(s) 360 (e.g., cellular-only, etc.), or may omit the satellite signal receiver 370, and so on. For brevity, illustration of the various alternative configurations is not provided herein, but would be readily understandable to one skilled in the art.

[0108] The various components of the UE 302, the base station 304, and the network entity 306 may be communicatively coupled to each other over data buses 334, 382, and 392, respectively. In an aspect, the data buses 334, 382, and 392 may form, or be part of, a communication interface of the UE 302, the base station 304, and the network entity 306, respectively. For example, where different logical entities are embodied in the same device (e.g., gNB and location server functionality incorporated into the same base station 304), the data buses 334, 382, and 392 may provide communication between them. QC2303292WOQualcomm Ref. No.2303292WO

[0109] The components of FIGS.3A, 3B, and 3C may be implemented in various ways. In some implementations, the components of FIGS. 3A, 3B, and 3C may be implemented in one or more circuits such as, for example, one or more processors and / or one or more ASICs (which may include one or more processors). Here, each circuit may use and / or incorporate at least one memory component for storing information or executable code used by the circuit to provide this functionality. For example, some or all of the functionality represented by blocks 310 to 346 may be implemented by processor and memory component(s) of the UE 302 (e.g., by execution of appropriate code and / or by appropriate configuration of processor components). Similarly, some or all of the functionality represented by blocks 350 to 388 may be implemented by processor and memory component(s) of the base station 304 (e.g., by execution of appropriate code and / or by appropriate configuration of processor components). Also, some or all of the functionality represented by blocks 390 to 398 may be implemented by processor and memory component(s) of the network entity 306 (e.g., by execution of appropriate code and / or by appropriate configuration of processor components). For simplicity, various operations, acts, and / or functions are described herein as being performed “by a UE,” “by a base station,” “by a network entity,” etc. However, as will be appreciated, such operations, acts, and / or functions may actually be performed by specific components or combinations of components of the UE 302, base station 304, network entity 306, etc., such as the processors 332, 384, 394, the transceivers 310, 320, 350, and 360, the memories 340, 386, and 396, the sidelink positioning component 342, 388, and 398, etc.

[0110] In some designs, the network entity 306 may be implemented as a core network component. In other designs, the network entity 306 may be distinct from a network operator or operation of the cellular network infrastructure (e.g., NG RAN 220 and / or 5GC 210 / 260). For example, the network entity 306 may be a component of a private network that may be configured to communicate with the UE 302 via the base station 304 or independently from the base station 304 (e.g., over a non-cellular communication link, such as Wi-Fi).

[0111] Various frame structures may be used to support downlink and uplink transmissions between network nodes (e.g., base stations and UEs). FIG.4 is a diagram 400 illustrating an example frame structure, according to aspects of the disclosure. The frame structure QC2303292WOQualcomm Ref. No.2303292WO may be a downlink or uplink frame structure. Other wireless communications technologies may have different frame structures and / or different channels.

[0112] LTE, and in some cases NR, utilizes orthogonal frequency-division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink. Unlike LTE, however, NR has an option to use OFDM on the uplink as well. OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth. For example, the spacing of the subcarriers may be 15 kilohertz (kHz) and the minimum resource allocation (resource block) may be 12 subcarriers (or 180 kHz). Consequently, the nominal fast Fourier transform (FFT) size may be equal to 128, 256, 512, 1024, or 2048 for system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), respectively. The system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.08 MHz (i.e., 6 resource blocks), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidth of 1.25, 2.5, 5, 10, or 20 MHz, respectively.

[0113] LTE supports a single numerology (subcarrier spacing (SCS), symbol length, etc.). In contrast, NR may support multiple numerologies (μ), for example, subcarrier spacings of 15 kHz (μ=0), 30 kHz (μ=1), 60 kHz (μ=2), 120 kHz (μ=3), and 240 kHz (μ=4) or greater may be available. In each subcarrier spacing, there are 14 symbols per slot. For 15 kHz SCS (μ=0), there is one slot per subframe, 10 slots per frame, the slot duration is 1 millisecond (ms), the symbol duration is 66.7 microseconds (μs), and the maximum nominal system bandwidth (in MHz) with a 4K FFT size is 50. For 30 kHz SCS (μ=1), there are two slots per subframe, 20 slots per frame, the slot duration is 0.5 ms, the symbol duration is 33.3 μs, and the maximum nominal system bandwidth (in MHz) with a 4K FFT size is 100. For 60 kHz SCS (μ=2), there are four slots per subframe, 40 slots per frame, the slot duration is 0.25 ms, the symbol duration is 16.7 μs, and the maximum nominal system bandwidth (in MHz) with a 4K FFT size is 200. For 120 kHz SCS (μ=3), there are eight slots per subframe, 80 slots per frame, the slot duration is 0.125 ms, the symbol duration is 8.33 μs, and the maximum nominal system bandwidth (in MHz) with a 4K FFT size is 400. For 240 kHz SCS (μ=4), there are 16 slots per subframe, 160 slots QC2303292WOQualcomm Ref. No.2303292WO per frame, the slot duration is 0.0625 ms, the symbol duration is 4.17 μs, and the maximum nominal system bandwidth (in MHz) with a 4K FFT size is 800.

[0114] In the example of FIG. 4, a numerology of 15 kHz is used. Thus, in the time domain, a 10 ms frame is divided into 10 equally sized subframes of 1 ms each, and each subframe includes one time slot. In FIG. 4, time is represented horizontally (on the X axis) with time increasing from left to right, while frequency is represented vertically (on the Y axis) with frequency increasing (or decreasing) from bottom to top.

[0115] A resource grid may be used to represent time slots, each time slot including one or more time-concurrent resource blocks (RBs) (also referred to as physical RBs (PRBs)) in the frequency domain. The resource grid is further divided into multiple resource elements (REs). An RE may correspond to one symbol length in the time domain and one subcarrier in the frequency domain. In the numerology of FIG. 4, for a normal cyclic prefix, an RB may contain 12 consecutive subcarriers in the frequency domain and seven consecutive symbols in the time domain, for a total of 84 REs. For an extended cyclic prefix, an RB may contain 12 consecutive subcarriers in the frequency domain and six consecutive symbols in the time domain, for a total of 72 REs. The number of bits carried by each RE depends on the modulation scheme.

[0116] Some of the REs may carry reference (pilot) signals (RS). The reference signals may include positioning reference signals (PRS), tracking reference signals (TRS), phase tracking reference signals (PTRS), cell-specific reference signals (CRS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), primary synchronization signals (PSS), secondary synchronization signals (SSS), synchronization signal blocks (SSBs), sounding reference signals (SRS), etc., depending on whether the illustrated frame structure is used for uplink or downlink communication. FIG.4 illustrates example locations of REs carrying a reference signal (labeled “R”).

[0117] A collection of resource elements (REs) that are used for transmission of PRS is referred to as a “PRS resource.” The collection of resource elements can span multiple PRBs in the frequency domain and ‘N’ (such as 1 or more) consecutive symbol(s) within a slot in the time domain. In a given OFDM symbol in the time domain, a PRS resource occupies consecutive PRBs in the frequency domain.

[0118] The transmission of a PRS resource within a given PRB has a particular comb size (also referred to as the “comb density”). A comb size ‘N’ represents the subcarrier spacing (or QC2303292WOQualcomm Ref. No.2303292WO frequency / tone spacing) within each symbol of a PRS resource configuration. Specifically, for a comb size ‘N,’ PRS are transmitted in every Nth subcarrier of a symbol of a PRB. For example, for comb-4, for each symbol of the PRS resource configuration, REs corresponding to every fourth subcarrier (such as subcarriers 0, 4, 8) are used to transmit PRS of the PRS resource. Currently, comb sizes of comb-2, comb-4, comb-6, and comb-12 are supported for DL-PRS. FIG. 4 illustrates an example PRS resource configuration for comb-4 (which spans four symbols). That is, the locations of the shaded REs (labeled “R”) indicate a comb-4 PRS resource configuration.

[0119] Currently, a DL-PRS resource may span 2, 4, 6, or 12 consecutive symbols within a slot with a fully frequency-domain staggered pattern. A DL-PRS resource can be configured in any higher layer configured downlink or flexible (FL) symbol of a slot. There may be a constant energy per resource element (EPRE) for all REs of a given DL-PRS resource. The following are the frequency offsets from symbol to symbol for comb sizes 2, 4, 6, and 12 over 2, 4, 6, and 12 symbols. 2-symbol comb-2: {0, 1}; 4-symbol comb-2: {0, 1, 0, 1}; 6-symbol comb-2: {0, 1, 0, 1, 0, 1}; 12-symbol comb-2: {0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1}; 4-symbol comb-4: {0, 2, 1, 3} (as in the example of FIG. 4); 12-symbol comb-4: {0, 2, 1, 3, 0, 2, 1, 3, 0, 2, 1, 3}; 6-symbol comb-6: {0, 3, 1, 4, 2, 5}; 12-symbol comb-6: {0, 3, 1, 4, 2, 5, 0, 3, 1, 4, 2, 5}; and 12-symbol comb-12: {0, 6, 3, 9, 1, 7, 4, 10, 2, 8, 5, 11}.

[0120] A “PRS resource set” is a set of PRS resources used for the transmission of PRS signals, where each PRS resource has a PRS resource ID. In addition, the PRS resources in a PRS resource set are associated with the same TRP. A PRS resource set is identified by a PRS resource set ID and is associated with a particular TRP (identified by a TRP ID). In addition, the PRS resources in a PRS resource set have the same periodicity, a common muting pattern configuration, and the same repetition factor (such as “PRS- ResourceRepetitionFactor”) across slots. The periodicity is the time from the first repetition of the first PRS resource of a first PRS instance to the same first repetition of the same first PRS resource of the next PRS instance. The periodicity may have a length selected from 2^μ*{4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 640, 1280, 2560, 5120, 10240} slots, with μ = 0, 1, 2, 3. The repetition factor may have a length selected from {1, 2, 4, 6, 8, 16, 32} slots. QC2303292WOQualcomm Ref. No.2303292WO

[0121] A PRS resource ID in a PRS resource set is associated with a single beam (or beam ID) transmitted from a single TRP (where a TRP may transmit one or more beams). That is, each PRS resource of a PRS resource set may be transmitted on a different beam, and as such, a “PRS resource,” or simply “resource,” also can be referred to as a “beam.” Note that this does not have any implications on whether the TRPs and the beams on which PRS are transmitted are known to the UE.

[0122] A “PRS instance” or “PRS occasion” is one instance of a periodically repeated time window (such as a group of one or more consecutive slots) where PRS are expected to be transmitted. A PRS occasion also may be referred to as a “PRS positioning occasion,” a “PRS positioning instance, a “positioning occasion,” “a positioning instance,” a “positioning repetition,” or simply an “occasion,” an “instance,” or a “repetition.”

[0123] A “positioning frequency layer” (also referred to simply as a “frequency layer”) is a collection of one or more PRS resource sets across one or more TRPs that have the same values for certain parameters. Specifically, the collection of PRS resource sets has the same subcarrier spacing and cyclic prefix (CP) type (meaning all numerologies supported for the physical downlink shared channel (PDSCH) are also supported for PRS), the same Point A, the same value of the downlink PRS bandwidth, the same start PRB (and center frequency), and the same comb-size. The Point A parameter takes the value of the parameter “ARFCN-ValueNR” (where “ARFCN” stands for “absolute radio-frequency channel number”) and is an identifier / code that specifies a pair of physical radio channel used for transmission and reception. The downlink PRS bandwidth may have a granularity of four PRBs, with a minimum of 24 PRBs and a maximum of 272 PRBs. Currently, up to four frequency layers have been defined, and up to two PRS resource sets may be configured per TRP per frequency layer.

[0124] The concept of a frequency layer is somewhat like the concept of component carriers and bandwidth parts (BWPs), but different in that component carriers and BWPs are used by one base station (or a macro cell base station and a small cell base station) to transmit data channels, while frequency layers are used by several (usually three or more) base stations to transmit PRS. A UE may indicate the number of frequency layers it can support when it sends the network its positioning capabilities, such as during an LTE positioning protocol (LPP) session. For example, a UE may indicate whether it can support one or four positioning frequency layers. QC2303292WOQualcomm Ref. No.2303292WO

[0125] 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, CSI-RS, DMRS, PSS, SSS, SSB, SRS, UL-PRS, etc. In addition, the terms “positioning reference signal” and “PRS” may refer to downlink, uplink, or sidelink positioning reference signals, unless otherwise indicated by the context. If needed to further distinguish the type of PRS, a downlink positioning reference signal may be referred to as a “DL-PRS,” an uplink positioning reference signal (e.g., an SRS-for-positioning, PTRS) may be referred to as an “UL-PRS,” and a sidelink positioning reference signal may be referred to as an “SL-PRS.” In addition, for signals that may be transmitted in the downlink, uplink, and / or sidelink (e.g., DMRS), the signals may be prepended with “DL,” “UL,” or “SL” to distinguish the direction. For example, “UL-DMRS” is different from “DL-DMRS.”

[0126] In an aspect, the reference signal carried on the REs labeled “R” in FIG. 4 may be SRS. SRS transmitted by a UE may be used by a base station to obtain the channel state information (CSI) for the transmitting UE. CSI describes how an RF signal propagates from the UE to the base station and represents the combined effect of scattering, fading, and power decay with distance. The system uses the SRS for resource scheduling, link adaptation, massive MIMO, beam management, etc.

[0127] A collection of REs that are used for transmission of SRS is referred to as an “SRS resource,” and may be identified by the parameter “SRS-ResourceId.” The collection of resource elements can span multiple PRBs in the frequency domain and ‘N’ (e.g., one or more) consecutive symbol(s) within a slot in the time domain. In a given OFDM symbol, an SRS resource occupies one or more consecutive PRBs. An “SRS resource set” is a set of SRS resources used for the transmission of SRS signals, and is identified by an SRS resource set ID (“SRS-ResourceSetId”).

[0128] The transmission of SRS resources within a given PRB has a particular comb size (also referred to as the “comb density”). A comb size ‘N’ represents the subcarrier spacing (or frequency / tone spacing) within each symbol of an SRS resource configuration. Specifically, for a comb size ‘N,’ SRS are transmitted in every Nth subcarrier of a symbol of a PRB. For example, for comb-4, for each symbol of the SRS resource configuration, 41 QC2303292WOQualcomm Ref. No.2303292WO REs corresponding to every fourth subcarrier (such as subcarriers 0, 4, 8) are used to transmit SRS of the SRS resource. In the example of FIG.4, the illustrated SRS is comb- 4 over four symbols. That is, the locations of the shaded SRS REs indicate a comb-4 SRS resource configuration.

[0129] Currently, an SRS resource may span 1, 2, 4, 8, or 12 consecutive symbols within a slot with a comb size of comb-2, comb-4, or comb-8. The following are the frequency offsets from symbol to symbol for the SRS comb patterns that are currently supported.1-symbol comb-2: {0}; 2-symbol comb-2: {0, 1}; 2-symbol comb-4: {0, 2}; 4-symbol comb-2: {0, 1, 0, 1}; 4-symbol comb-4: {0, 2, 1, 3} (as in the example of FIG. 4); 8-symbol comb-4: {0, 2, 1, 3, 0, 2, 1, 3}; 12-symbol comb-4: {0, 2, 1, 3, 0, 2, 1, 3, 0, 2, 1, 3}; 4-symbol comb-8: {0, 4, 2, 6}; 8-symbol comb-8: {0, 4, 2, 6, 1, 5, 3, 7}; and 12-symbol comb-8: {0, 4, 2, 6, 1, 5, 3, 7, 0, 4, 2, 6}.

[0130] Generally, as noted above, a UE transmits SRS to enable the receiving base station (either the serving base station or a neighboring base station) to measure the channel quality (i.e., CSI) between the UE and the base station. However, SRS can also be specifically configured as uplink positioning reference signals for uplink-based positioning procedures, such as uplink time difference of arrival (UL-TDOA), round-trip-time (RTT), uplink angle-of-arrival (UL-AoA), etc. As used herein, the term “SRS” may refer to SRS configured for channel quality measurements or SRS configured for positioning purposes. The former may be referred to herein as “SRS-for-communication” and / or the latter may be referred to as “SRS-for-positioning” or “positioning SRS” when needed to distinguish the two types of SRS.

[0131] Several enhancements over the previous definition of SRS may be available for SRS-for- positioning (also referred to as “UL-PRS”), such as a new staggered pattern within an SRS resource (except for single-symbol / comb-2), a new comb type for SRS, new sequences for SRS, a higher number of SRS resource sets per component carrier, and a higher number of SRS resources per component carrier. In addition, the parameters “SpatialRelationInfo” and “PathLossReference” are to be configured based on a downlink reference signal or SSB from a neighboring TRP. Further still, one SRS resource may be transmitted outside the active BWP, and one SRS resource may span across multiple component carriers. Also, SRS may be configured in RRC connected state and only transmitted within an active BWP. Further, there may be no frequency hopping, no QC2303292WOQualcomm Ref. No.2303292WO repetition factor, a single antenna port, and new lengths for SRS (e.g., 8 and 12 symbols). There also may be open-loop power control and not closed-loop power control, and comb- 8 (i.e., an SRS transmitted every eighth subcarrier in the same symbol) may be used. Lastly, the UE may transmit through the same transmit beam from multiple SRS resources for UL-AoA. These features may be configured through RRC higher layer signaling (and potentially triggered or activated through a MAC control element (MAC-CE) or downlink control information (DCI)).

[0132] Sidelink communication takes place in transmission or reception resource pools. In the frequency domain, the minimum resource allocation unit is a sub-channel (e.g., a collection of consecutive PRBs in the frequency domain). In the time domain, resource allocation is in one slot intervals. However, some slots are not available for sidelink, and some slots contain feedback resources. In addition, sidelink resources can be (pre)configured to occupy fewer than the 14 symbols of a slot.

[0133] Sidelink resources are configured at the radio resource control (RRC) layer. The RRC configuration can be by pre-configuration (e.g., preloaded on the UE) or configuration (e.g., from a serving base station).

[0134] NR sidelinks support hybrid automatic repeat request (HARQ) retransmission. FIG. 5A is a diagram 500 of an example slot structure without feedback resources, according to aspects of the disclosure. In the example of FIG.5A, time is represented horizontally and frequency is represented vertically. In the time domain, the length of each block is one orthogonal frequency division multiplexing (OFDM) symbol, and the 14 symbols make up a slot. In the frequency domain, the height of each block is one sub-channel. Currently, the (pre)configured sub-channel size can be selected from the set of {10, 15, 20, 25, 50, 75, 100} physical resource blocks (PRBs).

[0135] For a sidelink slot, the first symbol is a repetition of the preceding symbol and is used for automatic gain control (AGC) setting. This is illustrated in FIG. 5A by the vertical and horizontal hashing. As shown in FIG. 5A, for sidelink, the physical sidelink control channel (PSCCH) and the physical sidelink shared channel (PSSCH) are transmitted in the same slot. Similar to the physical downlink control channel (PDCCH), the PSCCH carries control information about sidelink resource allocation and descriptions about sidelink data transmitted to the UE. Likewise, similar to the physical downlink shared channel (PDSCH), the PSSCH carries user data for the UE. In the example of FIG.5A, QC2303292WOQualcomm Ref. No.2303292WO the PSCCH occupies half the bandwidth of the sub-channel and only three symbols. Finally, a gap symbol is present after the PSSCH.

[0136] FIG.5B is a diagram 550 of an example slot structure with feedback resources, according to aspects of the disclosure. In the example of FIG.5B, time is represented horizontally and frequency is represented vertically. In the time domain, the length of each block is one OFDM symbol, and the 14 symbols make up a slot. In the frequency domain, the height of each block is one sub-channel.

[0137] The slot structure illustrated in FIG. 5B is similar to the slot structure illustrated in FIG. 5A, except that the slot structure illustrated in FIG. 5B includes feedback resources. Specifically, two symbols at the end of the slot have been dedicated to the physical sidelink feedback channel (PSFCH). The first PSFCH symbol is a repetition of the second PSFCH symbol for AGC setting. In addition to the gap symbol after the PSSCH, there is a gap symbol after the two PSFCH symbols. Currently, resources for the PSFCH can be configured with a periodicity selected from the set of {0, 1, 2, 4} slots.

[0138] The first 13 symbols of a slot in the time domain and the allocated subchannel(s) in the frequency domain form a sidelink resource pool. A sidelink resource pool may include resources for sidelink communication (transmission and / or reception), sidelink positioning (referred to as a resource pool for positioning (RP-P)), or both communication and positioning. A resource pool configured for both communication and positioning is referred to as a “shared” resource pool. In a shared resource pool, the RP-P is indicated by an offset, periodicity, number of consecutive symbols within a slot (e.g., as few as one symbol), and / or the bandwidth within a component carrier (or the bandwidth across multiple component carriers). In addition, the RP-P can be associated with a zone or a distance from a reference location.

[0139] A base station (or a UE, depending on the resource allocation mode) can assign, to another UE, one or more resource configurations from the RP-Ps. Additionally or alternatively, a UE (e.g., a relay or a remote UE) can request one or more RP-P configurations, and it can include in the request one or more of the following: (1) its location information (or zone identifier), (2) periodicity, (3) bandwidth, (4) offset, (5) number of symbols, and (6) whether a configuration with “low interference” is needed (which can be determined through an assigned quality of service (QoS) or priority). 44 QC2303292WOQualcomm Ref. No.2303292WO

[0140] A base station or a UE can configure / assign rate matching resources or RP-P for rate matching and / or muting to a sidelink UE such that when a collision exists between the assigned resources and another resource pool that contains data (PSSCH) and / or control (PSCCH), the sidelink UE is expected to rate match, mute, and / or puncture the data, DMRS, and / or CSI-RS within the colliding resources. This would enable orthogonalization between positioning and data transmissions for increased coverage of PRS signals.

[0141] FIG. 6 is a diagram 600 illustrating an example of a resource pool for positioning configured within a sidelink resource pool for communication (i.e., a shared resource pool), according to aspects of the disclosure. In the example of FIG.6, time is represented horizontally and frequency is represented vertically. In the time domain, the length of each block is an orthogonal frequency division multiplexing (OFDM) symbol, and the 14 symbols make up a slot. In the frequency domain, the height of each block is a sub- channel.

[0142] In the example of FIG. 6, the entire slot (except for the first and last symbols) can be a resource pool for sidelink communication. That is, any of the symbols other than the first and last can be allocated for sidelink communication. However, an RP-P is allocated in the last four pre-gap symbols of the slot. As such, non-sidelink positioning data, such as user data (PSSCH), CSI-RS, and control information, can only be transmitted in the first eight post-AGC symbols and not in the last four pre-gap symbols to prevent a collision with the configured RP-P. The non-sidelink positioning data that would otherwise be transmitted in the last four pre-gap symbols can be punctured or muted, or the non- sidelink data that would normally span more than the eight post-AGC symbols can be rate matched to fit into the eight post-AGC symbols.

[0143] Sidelink positioning reference signals (SL-PRS) have been defined to enable sidelink positioning procedures among UEs. Like a downlink PRS (DL-PRS), an SL-PRS resource is composed of one or more resource elements (i.e., one OFDM symbol in the time domain and one subcarrier in the frequency domain). SL-PRS resources have been designed with a comb-based pattern to enable fast Fourier transform (FFT)-based processing at the receiver. SL-PRS resources are composed of unstaggered, or only partially staggered, resource elements in the frequency domain to provide small time of arrival (TOA) uncertainty and reduced overhead of each SL-PRS resource. SL-PRS may QC2303292WOQualcomm Ref. No.2303292WO also be associated with specific RP-Ps (e.g., certain SL-PRS may be allocated in certain RP-Ps). SL-PRS have also been defined with intra-slot repetition (not shown in FIG. 6) to allow for combining gains (if needed). There may also be inter-UE coordination of RP-Ps to provide for dynamic SL-PRS and data multiplexing while minimizing SL-PRS collisions.

[0144] NR supports a number of cellular network-based positioning technologies, including downlink-based, uplink-based, and downlink-and-uplink-based positioning methods. Downlink-based positioning methods include observed time difference of arrival (OTDOA) in LTE, downlink time difference of arrival (DL-TDOA) in NR, and downlink angle-of-departure (DL-AoD) in NR. In an OTDOA or DL-TDOA positioning procedure, a UE measures the differences between the times of arrival (ToAs) of reference signals (e.g., positioning reference signals (PRS)) received from pairs of base stations, referred to as reference signal time difference (RSTD) or time difference of arrival (TDOA) measurements, and reports them to a positioning entity. More specifically, the UE receives the identifiers (IDs) of a reference base station (e.g., a serving base station) and multiple non-reference base stations in assistance data. The UE then measures the RSTD between the reference base station and each of the non-reference base stations. Based on the known locations of the involved base stations and the RSTD measurements, the positioning entity (e.g., the UE for UE-based positioning or a location server for UE- assisted positioning) can estimate the UE’s location.

[0145] For DL-AoD positioning, the positioning entity uses a measurement report from the UE of received signal strength measurements of multiple downlink transmit beams to determine the angle(s) between the UE and the transmitting base station(s). The positioning entity can then estimate the location of the UE based on the determined angle(s) and the known location(s) of the transmitting base station(s).

[0146] Uplink-based positioning methods include uplink time difference of arrival (UL-TDOA) and uplink angle-of-arrival (UL-AoA). UL-TDOA is similar to DL-TDOA, but is based on uplink reference signals (e.g., sounding reference signals (SRS)) transmitted by the UE to multiple base stations. Specifically, a UE transmits one or more uplink reference signals that are measured by a reference base station and a plurality of non-reference base stations. Each base station then reports the reception time (referred to as the relative time of arrival (RTOA)) of the reference signal(s) to a positioning entity (e.g., a location 46 QC2303292WOQualcomm Ref. No.2303292WO server) that knows the locations and relative timing of the involved base stations. Based on the reception-to-reception (Rx-Rx) time difference between the reported RTOA of the reference base station and the reported RTOA of each non-reference base station, the known locations of the base stations, and their known timing offsets, the positioning entity can estimate the location of the UE using TDOA.

[0147] For UL-AoA positioning, one or more base stations measure the received signal strength of one or more uplink reference signals (e.g., SRS) received from a UE on one or more uplink receive beams. The positioning entity uses the signal strength measurements and the angle(s) of the receive beam(s) to determine the angle(s) between the UE and the base station(s). Based on the determined angle(s) and the known location(s) of the base station(s), the positioning entity can then estimate the location of the UE.

[0148] Downlink-and-uplink-based positioning methods include enhanced cell-ID (E-CID) positioning and multi-round-trip-time (RTT) positioning (also referred to as “multi-cell RTT” and “multi-RTT”). In an RTT procedure, a first entity (e.g., a base station or a UE) transmits a first RTT-related signal (e.g., a PRS or SRS) to a second entity (e.g., a UE or base station), which transmits a second RTT-related signal (e.g., an SRS or PRS) back to the first entity. Each entity measures the time difference between the time of arrival (ToA) of the received RTT-related signal and the transmission time of the transmitted RTT-related signal. This time difference is referred to as a reception-to-transmission (Rx- Tx) time difference. The Rx-Tx time difference measurement may be made, or may be adjusted, to include only a time difference between nearest slot boundaries for the received and transmitted signals. Both entities may then send their Rx-Tx time difference measurement to a location server (e.g., an LMF 270), which calculates the round trip propagation time (i.e., RTT) between the two entities from the two Rx-Tx time difference measurements (e.g., as the sum of the two Rx-Tx time difference measurements). Alternatively, one entity may send its Rx-Tx time difference measurement to the other entity, which then calculates the RTT. The distance between the two entities can be determined from the RTT and the known signal speed (e.g., the speed of light). For multi- RTT positioning, a first entity (e.g., a UE or base station) performs an RTT positioning procedure with multiple second entities (e.g., multiple base stations or UEs) to enable the location of the first entity to be determined (e.g., using multilateration) based on distances to, and the known locations of, the second entities. RTT and multi-RTT methods can be QC2303292WOQualcomm Ref. No.2303292WO combined with other positioning techniques, such as UL-AoA and DL-AoD, to improve location accuracy.

[0149] The E-CID positioning method is based on radio resource management (RRM) measurements. In E-CID, the UE reports the serving cell ID, the timing advance (TA), and the identifiers, estimated timing, and signal strength of detected neighbor base stations. The location of the UE is then estimated based on this information and the known locations of the base station(s).

[0150] To assist positioning operations, a location server (e.g., location server 230, LMF 270, SLP 272) may provide assistance data to the UE. For example, the assistance data may include identifiers of the base stations (or the cells / TRPs of the base stations) from which to measure reference signals, the reference signal configuration parameters (e.g., the number of consecutive slots including PRS, periodicity of the consecutive slots including PRS, muting sequence, frequency hopping sequence, reference signal identifier, reference signal bandwidth, etc.), and / or other parameters applicable to the particular positioning method. Alternatively, the assistance data may originate directly from the base stations themselves (e.g., in periodically broadcasted overhead messages, etc.). In some cases, the UE may be able to detect neighbor network nodes itself without the use of assistance data.

[0151] In the case of an OTDOA or DL-TDOA positioning procedure, the assistance data may further include an expected RSTD value and an associated uncertainty, or search window, around the expected RSTD. In some cases, the value range of the expected RSTD may be + / - 500 microseconds (μs). In some cases, when any of the resources used for the positioning measurement are in FR1, the value range for the uncertainty of the expected RSTD may be + / - 32 μs. In other cases, when all of the resources used for the positioning measurement(s) are in FR2, the value range for the uncertainty of the expected RSTD may be + / - 8 μs.

[0152] A location estimate may be referred to by other names, such as a position estimate, location, position, position fix, fix, or the like. A location estimate may be geodetic and comprise coordinates (e.g., latitude, longitude, and possibly altitude) or may be civic and comprise a street address, postal address, or some other verbal description of a location. A location estimate may further be defined relative to some other known location or defined in absolute terms (e.g., using latitude, longitude, and possibly altitude). A location estimate may include an expected error or uncertainty (e.g., by including an area or QC2303292WOQualcomm Ref. No.2303292WO volume within which the location is expected to be included with some specified or default level of confidence).

[0153] NR supports, or enables, various sidelink positioning techniques. FIG. 7A illustrates various scenarios of interest for sidelink-only or joint Uu and sidelink positioning, according to aspects of the disclosure. In scenario 710, at least one peer UE with a known location can improve the Uu-based positioning (e.g., multi-cell round-trip-time (RTT), downlink time difference of arrival (DL-TDOA), etc.) of a target UE by providing an additional anchor (e.g., using sidelink RTT (SL-RTT)). In scenario 720, a low-end (e.g., reduced capacity, or “RedCap”) target UE may obtain the assistance of premium UEs to determine its location using, e.g., sidelink positioning and ranging procedures with the premium UEs. Compared to the low-end UE, the premium UEs may have more capabilities, such as more sensors, a faster processor, more memory, more antenna elements, higher transmit power capability, access to additional frequency bands, or any combination thereof. In scenario 730, a relay UE (e.g., with a known location) participates in the positioning estimation of a remote UE without performing uplink positioning reference signal (PRS) transmission over the Uu interface. Scenario 740 illustrates the joint positioning of multiple UEs. Specifically, in scenario 740, two UEs with unknown positions can be jointly located in non-line-of-sight (NLOS) conditions by utilizing constraints from nearby UEs.

[0154] FIG. 7B illustrates additional scenarios of interest for sidelink-only or joint Uu and sidelink positioning, according to aspects of the disclosure. In scenario 750, UEs used for public safety (e.g., by police, firefighters, and / or the like) may perform peer-to-peer (P2P) positioning and ranging for public safety and other uses. For example, in scenario 750, the public safety UEs may be out of coverage of a network and determine a location or a relative distance and a relative position among the public safety UEs using sidelink positioning techniques. Similarly, scenario 760 shows multiple UEs that are out of coverage and determine a location or a relative distance and a relative position using sidelink positioning techniques, such as SL-RTT.

[0155] The following SLPP message types are currently defined (message contents undefined): x Request Capabilities; x Provide Capabilities; x Request Assistance Data; QC2303292WOQualcomm Ref. No.2303292WO x Provide Assistance Data; x Request Location Information; x Provide Location Information; x Abort; x Error.

[0156] In some designs, in order to support sidelink positioning, SLPP / RSPP may support at least the following functionalities: x 1. SL Positioning Capability Transfer x 2. SL Positioning Assistance Data exchange x 3. SL Location Information Transfer x 4. Error handling x 5. Abort

[0157] Note that the above-noted supported functionalities and message types do not specify any specific signaling structure.

[0158] In some designs, sidelink positioning supports a session-based concept in SLPP, in which signaling messages within a session can be associated with one another by the involved UEs. In some designs, at least in the case that positioning methods are supported that do not require a mutual exchange of SLPP messages associated with one another among UEs, SLPP session-less operation can be supported. As used herein, “session-less” operation refers to operation where the participants are not expressly coordinated in advance (e.g., without necessarily performing discovery and setup first). From RAN2 perspective, in some designs, if it is determined to support group positioning, it is feasible to perform at least ranging with the estimate calculation at multiple UEs.

[0159] FIG. 8 illustrates a SLPP Session Establishment Procedure 800, in accordance with aspects of the disclosure.

[0160] Referring to FIG. 8, at operation 0, UE1 discovers UEs 2 to n, including their capability to support SLPP. At operation, UE1 invites UEs 2-n to an SLPP session using an SLPP Create Session Request message (unicast, groupcast or broadcast). At operation 2, UEs 2-n accept or reject SLPP session request using an SLPP Create Session Accept / Reject message (unicast, groupcast or broadcast). At 3, UE1 determines UEs for the SLPP session (not all UEs may accept). At operation 4, UE1 initiates an SLPP session using an SLPP Session Start Request message (unicast, groupcast or broadcast). The SLPP Session QC2303292WOQualcomm Ref. No.2303292WO Start Request message includes Application Layer ID and L2 ID for each UE in the session, and UE1-assigned SLPP UE ID for each UE in the session. At operation 5, participating UEs acknowledge the session start with an SLPP Session Start Request message (unicast, groupcast or broadcast). At operation 6, sidelink Positioning / Ranging is conducted. At operation 7, UE1 terminates the SLPP session by sending an SLPP Session End Request message (unicast, groupcast or broadcast). At operation 8, UEs participating in the session acknowledge the session termination via SLPP Session End Response message (unicast, groupcast or broadcast

[0161] FIG. 9 illustrates a SLPP Session-less Procedure 900, in accordance with aspects of the disclosure. At operation 1, UE1 transmits an SLPP Provide Assistance Data message (unicast, groupcast or broadcast) to start session-less ranging / positioning. UEs receiving the SLPP Provide Assistance Data message determine this is for session-less operation through omission of the SLPP Session ID, an allocated space of SLPP Session IDs, or other. At operation 2, participating UEs transmit SL-PRS per configuration in SLPP Provide Assistance Data message. At operation 3, UE1 (and optionally one or more of UEs 2…n transmit SLPP Request Location Information. At operation 4, participating UEs perform SL-PRS measurements per configuration in SLPP Provide Assistance Data message. At operation 5, participating UEs transmit SLPP Provide Location Information message with the measurement results. SL-PRS transmission and SL-PRS measurement may be performed periodically, based on the configuration received in the SLPP Provide Assistance Data message

[0162] FIG.10 illustrates a use case 1000 of the SLPP Session-less Procedure 900 of FIG. 9, in accordance with aspects of the disclosure. In particular, FIG. 10 depicts RSU ranging / positioning of vehicles traversing an intersection.

[0163] In some designs, connection-less (or session-less) groupcast signaling includes a zone identifier (ID) of the transmitting device. In some designs, connection-less (or session- less) broadcast signaling does not include the zone-ID of the transmitting device.

[0164] Applications are being developed in each of these areas. Safety applications center on the basic safety message (BSM), a packet of data that contains information about vehicle position, heading, speed, and other information relating to a vehicle’s state and predicted path. The BSM contains no personally identifying information (PII). QC2303292WOQualcomm Ref. No.2303292WO Mobility and environmental applications may be “opt-in” applications where the traveler decides which, if any, of the applications to use.

[0165] FIG. 11 illustrates a Table 1100 depicting V2X signaling fields, in accordance with aspects of the disclosure. Such fields may be utilized for session-less operations, in some designs.

[0166] FIG. 12 illustrates a SL-PRS configuration 1200, in accordance with aspects of the disclosure.

[0167] Aspects of the disclosure are directed to a session-less SL-based position estimation procedure, whereby a device multicasts / broadcasts a message requesting SL-PRS transmission by nearby UE(s) and which further includes SL-PRS assistance data for the SL-PRS transmission. The message facilitates the UE(s) to select a set of SL-PRS transmission parameters from a set of SL-PRS transmission parameter options, either pseudo-randomly or deterministically (i.e., rule-based), based on message-specific information. Such aspects may provide various technical advantages, such as low-latency position estimation that does not require a session to be setup before being initiated (e.g., particularly useful for UEs with high mobility, such as V2X use cases).

[0168] FIG.13 illustrates an exemplary process 1300 of communications according to an aspect of the disclosure. The process 1300 of FIG.13 is performed by a UE, such as UE 302.

[0169] Referring to FIG.13, at 1310, the UE (e.g., receiver 312 or 322, etc.) receives a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL- PRS assistance data for the SL-PRS transmission. In an aspect, the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE. In an aspect, a means for performing the reception of 1310 includes receiver 312 or 322, etc., of FIG.3A.

[0170] Referring to FIG. 13, at 1320, the UE (e.g., processor(s) 332, sidelink positioning component 342, etc.) selects a set of SL-PRS transmission parameters from the set of SL- PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information. In an aspect, a means for performing the selection of 1320 includes processor(s) 332, sidelink positioning component 342, etc., of FIG.3A.

[0171] Referring to FIG.13, at 1330, the UE (e.g., transmitter 314 or 324, etc.) performs the SL- PRS transmission in accordance with the set of SL-PRS transmission parameters. In an QC2303292WOQualcomm Ref. No.2303292WO aspect, a means for performing the transmission of 1330 includes transmitter 314 or 324, etc., of FIG.3A.

[0172] FIG.14 illustrates an exemplary process 1400 of communications according to an aspect of the disclosure. The process 1400 of FIG. 14 is performed by a wireless node, such as UE 302, gNB / BS 304, an O-RAN component such as RU, etc. In some designs, the wireless node corresponds to an RSU, which may include a wired backhaul analogous to gNB / BS / RU or a wireless backhaul analogous to UE.

[0173] Referring to FIG. 14, at 1410, the wireless node (e.g., transmitter 314 or 324 or 354 or 364, etc.) transmits a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission. In an aspect, the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE. In an aspect, a means for performing the transmission of 1410 includes transmitter 314 or 324 or 354 or 364, etc., of FIG.3A or FIG.3B.

[0174] Referring to FIG.14, at 1420, the wireless node (e.g., receiver 312 or 322 or 352 or 362, transmitter 314 or 324 or 354 or 364, sidelink positioning component 342 or 388, process(s) 332 or 384, etc.) performs one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information. In an aspect, a means for performing the one or more positioning measurements of 1420 includes receiver 312 or 322 or 352 or 362, transmitter 314 or 324 or 354 or 364, sidelink positioning component 342 or 388, process(s) 332 or 384, etc., of FIG.3A or FIG.3B.

[0175] Referring to FIGS. 13-14, in some designs, the set of SL-PRS transmission parameters comprises: x scrambling identifier (ID), or x comb-size, or x comb-offset, or x number of PRS symbols, or x symbol offset within a slot or a mini-slot, x slot offset, or QC2303292WOQualcomm Ref. No.2303292WO x frequency domain offset, or x mini-slot selection inside a slot, or x any combination thereof

[0176] Referring to FIGS. 13-14, in some designs, the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof.

[0177] Referring to FIGS. 13-14, in some designs, the SL-PRS assistance data comprises an indication of a maximum validity duration associated with one or more SL-PRS transmission parameters of the set of SL-PRS transmission parameters. For example, the maximum validity duration is associated with an exponential back-off timer.

[0178] Referring to FIGS. 13-14, in some designs, the message-specific information comprises validity area information. In an aspect, the SL-PRS assistance data comprises indications of a first validity area and a second validity area, the first validity area is associated with a first set of SL-PRS transmission parameter options, the second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and the set of SL- PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options. In some designs, the first and second validity areas correspond to first and second sidelink zones, or the first and second validity areas correspond to first and second lanes of traffic.

[0179] Referring to FIGS. 13-14, in some designs, the set of SL-PRS transmission parameter options corresponds to a pre-configured set of SL-PRS transmission parameter options (e.g., in which case the message may provide an index to a desired pre-configured parameter).

[0180] Referring to FIGS. 13-14, in some designs, the selection of 1320 is based on a SL-PRS priority that is indicated by the message-specific information (e.g., an express priority indication, or an implicit priority indication that provides some information or rules by which the UE may determine the SL-PRS priority). In an aspect, a first SL-PRS priority is associated with a first set of SL-PRS transmission parameter options, and a second SL- PRS priority is associated with a second set of SL-PRS transmission parameter options QC2303292WOQualcomm Ref. No.2303292WO that is different from the first set of SL-PRS transmission parameter options, and the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0181] Referring to FIGS. 13-14, in some designs, the message-specific information comprises one or more channel condition criteria. In an aspect, the UE further determines a channel condition, and the selection of 1320 is further based on the channel condition and the one or more channel condition criteria. In an aspect, the one or more channel condition criteria comprise a channel quality threshold, a channel busy ratio (CBR), or both. In an example, the channel condition comprises a first channel quality above the channel quality threshold or a first CBR below the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a first set of SL-PRS transmission parameter options. In an alternative example, the channel condition comprises a second channel quality less than or equal to the channel quality threshold or a second CBR greater than or equal to the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a second set of SL-PRS transmission parameter options that is different than the first set of SL-PRS transmission parameter options.

[0182] Referring to FIGS.13-14, in some designs, the message is received at the UE from another UE or a roadside unit (RSU). In other words, in an aspect, the wireless node corresponds to another UE or RSU.

[0183] Referring to FIGS.13-14, in some designs, the session-less SL-based position estimation procedure is associated with position estimation for the UE, another UE, a wireless node from which the message is received, or a combination thereof.

[0184] Referring to FIGS- 13-14, in a specific example, SL-PRS transmission properties of interest inside a dedicated resource pool for positioning x Scrambling ID x Comb-size x Comb-offset x Number of PRS symbols x Symbol Offset within the slot (or the mini-slot) x Slot offset x Frequency domain offset QC2303292WOQualcomm Ref. No.2303292WO x Mini-slot selection inside a slot

[0185] Referring to FIGS- 13-14, in a specific example, for session-less SL-PRS transmission, a device (e.g. RSU) broadcasts / groupcast messages with the SL-PRS assistance data, and one or multiple of the above SL-PRS transmission properties are chosen by each recipient of the device (without an ACK or further handshake) as follows: x Option 1: pseudo-randomly based on the source ID, destination ID, or source zone- ID, or transmitting zone-ID, or a combination x Option 2: deterministically based on the source ID, destination ID, or source zone-ID, or transmitting zone-ID, or a combination

[0186] Referring to FIGS- 13-14, in a specific example, for session-less SL-PRS transmission, in the broadcast message that is sent out with the SL-PRS assistance data, one or more of the following information may be included: x Aspect 1: which parameter can be chosen “freely” by the transmitting device. x Aspect 2: For how long such parameter can stay constant (expiration timer) before a new value should be chosen by the transmitting device. (e.g. exponential back-off timer) x Aspect 3: A validity area (e.g. zone-ID-based or RSRP-threshold-based) associated with each chosen transmission parameter set x Aspect 4: Pre-configured complete parameter set may be provided, and a device may pick one of the available.

[0187] In case of Aspect 4, in an example, the wireless node may broadcast 3 sets of options, and a UE randomly picks one of the options, but cannot “pick and choose”, e.g.: x set0 = {Comb-Offset0, mini-slot0, slot-offset0} x set1 = {Comb-Offset1, mini-slot1, slot-offset1} x set2 = {Comb-Offset2, mini-slot2, slot-offset2}

[0188] Referring to FIGS- 13-14, in a specific example, different allowable parameter sets of SL-PRS transmissions for different priorities of SL-PRS may be supported. For example, the wireless node may broadcast 3 sets of options, and a device picks one of the options based on the SL-PRS priority level x set0 = {Comb-Offset0, mini-slot0, slot-offset0} -> priority 0 x set1 = {Comb-Offset1, mini-slot1, slot-offset1} -> priority 0 x set2 = {Comb-Offset2, mini-slot2, slot-offset2} -> priority 0 QC2303292WOQualcomm Ref. No.2303292WO

[0189] Referring to FIGS- 13-14, in a specific example, different allowable parameter sets of SL-PRS transmissions for measured channel busy ratio, or quality of measurements may be supported. For example, the wireless node may broadcast 3 sets of options, and a device picks one of the options based on the SL-PRS priority level x set0 = {Comb-Offset0, mini-slot0, slot-offset0} ->prior sensing results show an empty channel x set1 = {Comb-Offset1, mini-slot1, slot-offset1} ->prior sensing results show a busy channel x set2 = {Comb-Offset2, mini-slot2, slot-offset2} -> priority 0

[0190] Referring to FIGS- 13-14, in a specific example, an RSU can use prior knowledge based on BSM (e.g., location estimate, direction, speed, direction of travel) to assign different buckets of allowable transmission parameters to different zones. This will help for devices to perform better sensing to help with the reduction on hidden node problem.

[0191] FIG.15 illustrates an example implementation 1500 of the processes 1300-1400 of FIGS. 13-14, respectively, in accordance with aspects of the disclosure. In particular, FIG. 15 depicts the use case 1000 from FIG. 10 with sidelink zones 1510, 1520, 1530 and 1540 superimposed thereon. Here, each UE may use knowledge of its sidelink zone to pick from the appropriate set of SL-PRS transmission parameter options for SL-PRS transmission.

[0192] In the detailed description above it can be seen that different features are grouped together in examples. This manner of disclosure should not be understood as an intention that the example clauses have more features than are explicitly mentioned in each clause. Rather, the various aspects of the disclosure may include fewer than all features of an individual example clause disclosed. Therefore, the following clauses should hereby be deemed to be incorporated in the description, wherein each clause by itself can stand as a separate example. Although each dependent clause can refer in the clauses to a specific combination with one of the other clauses, the aspect(s) of that dependent clause are not limited to the specific combination. It will be appreciated that other example clauses can also include a combination of the dependent clause aspect(s) with the subject matter of any other dependent clause or independent clause or a combination of any feature with other dependent and independent clauses. The various aspects disclosed herein expressly include these combinations, unless it is explicitly expressed or can be readily inferred that QC2303292WOQualcomm Ref. No.2303292WO a specific combination is not intended (e.g., contradictory aspects, such as defining an element as both an electrical insulator and an electrical conductor). Furthermore, it is also intended that aspects of a clause can be included in any other independent clause, even if the clause is not directly dependent on the independent clause.

[0193] Implementation examples are described in the following numbered clauses:

[0194] Clause 1. A method of operating a user equipment (UE), comprising: receiving a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL- PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; selecting a set of SL-PRS transmission parameters from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information; and performing the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters.

[0195] Clause 2. The method of clause 1, wherein the set of SL-PRS transmission parameters comprises: scrambling identifier (ID), or comb-size, or comb-offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, slot offset, or frequency domain offset, or mini-slot selection inside a slot, or any combination thereof.

[0196] Clause 3. The method of any of clauses 1 to 2, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof.

[0197] Clause 4. The method of any of clauses 1 to 3, wherein the SL-PRS assistance data comprises an indication of a maximum validity duration associated with one or more SL- PRS transmission parameters of the set of SL-PRS transmission parameters.

[0198] Clause 5. The method of clause 4, wherein the maximum validity duration is associated with an exponential back-off timer.

[0199] Clause 6. The method of any of clauses 1 to 5, wherein the message-specific information comprises validity area information.

[0200] Clause 7. The method of clause 6, wherein the SL-PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the QC2303292WOQualcomm Ref. No.2303292WO second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0201] Clause 8. The method of clause 7, wherein the first and second validity areas correspond to first and second sidelink zones, or wherein the first and second validity areas correspond to first and second lanes of traffic.

[0202] Clause 9. The method of any of clauses 1 to 8, wherein the set of SL-PRS transmission parameter options corresponds to a pre-configured set of SL-PRS transmission parameter options.

[0203] Clause 10. The method of any of clauses 1 to 9, wherein the selection is based on a SL- PRS priority that is indicated by the message-specific information.

[0204] Clause 11. The method of clause 10, wherein a first SL-PRS priority is associated with a first set of SL-PRS transmission parameter options, and wherein a second SL-PRS priority is associated with a second set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0205] Clause 12. The method of any of clauses 1 to 11, wherein the message-specific information comprises one or more channel condition criteria.

[0206] Clause 13. The method of clause 12, further comprising: determining a channel condition, wherein the selection is further based on the channel condition and the one or more channel condition criteria.

[0207] Clause 14. The method of clause 13, wherein the one or more channel condition criteria comprise a channel quality threshold, a channel busy ratio (CBR), or both, wherein the channel condition comprises a first channel quality above the channel quality threshold or a first CBR below the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a first set of SL-PRS transmission parameter options, or wherein the channel condition comprises a second channel quality less than or equal to the channel quality threshold or a second CBR greater than or equal to the CBR threshold, and the set QC2303292WOQualcomm Ref. No.2303292WO of SL-PRS transmission parameter options corresponds to a second set of SL-PRS transmission parameter options that is different than the first set of SL-PRS transmission parameter options.

[0208] Clause 15. The method of any of clauses 1 to 14, wherein the message is received from another UE or a roadside unit (RSU).

[0209] Clause 16. The method of any of clauses 1 to 15, wherein the session-less SL-based position estimation procedure is associated with position estimation for the UE, another UE, a wireless node from which the message is received, or a combination thereof.

[0210] Clause 17. A method of operating a wireless node, comprising: transmitting a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; and performing one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information.

[0211] Clause 18. The method of clause 17, wherein the set of SL-PRS transmission parameters comprises: scrambling identifier (ID), or comb-size, or comb-offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, slot offset, or frequency domain offset, or mini-slot selection inside a slot, or any combination thereof.

[0212] Clause 19. The method of any of clauses 17 to 18, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof.

[0213] Clause 20. The method of any of clauses 17 to 19, wherein the SL-PRS assistance data further comprises an indication of a maximum validity duration associated with one or more SL-PRS transmission parameters of the set of SL-PRS transmission parameters.

[0214] Clause 21. The method of clause 20, wherein the maximum validity duration is associated with an exponential back-off timer. QC2303292WOQualcomm Ref. No.2303292WO

[0215] Clause 22. The method of any of clauses 17 to 21, wherein the message-specific information comprises validity area information.

[0216] Clause 23. The method of clause 22, wherein the SL-PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0217] Clause 24. The method of any of clauses 17 to 23, wherein the set of SL-PRS transmission parameter options corresponds to a pre-configured set of SL-PRS transmission parameter options.

[0218] Clause 25. The method of any of clauses 17 to 24, wherein the message-specific information comprises SL-PRS priority.

[0219] Clause 26. The method of any of clauses 17 to 25, wherein the message-specific information comprises one or more channel condition criteria.

[0220] Clause 27. The method of clause 26, wherein the one or more channel condition criteria comprises a channel quality threshold, a channel busy ratio (CBR), or both.

[0221] Clause 28. The method of any of clauses 17 to 27, wherein the wireless node corresponds to another UE or a roadside unit (RSU).

[0222] Clause 29. A user equipment (UE), comprising: one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: receive, via the one or more transceivers, a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL- PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; select a set of SL-PRS transmission parameters from the set of SL- PRS transmission parameter options pseudo-randomly or deterministically based on QC2303292WOQualcomm Ref. No.2303292WO message-specific information; and perform the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters.

[0223] Clause 30. The UE of clause 29, wherein the set of SL-PRS transmission parameters comprises: scramble identifier (ID), or comb -size, or comb-offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, slot offset, or frequency domain offset, or mini-slot selection inside a slot, or any combination thereof.

[0224] Clause 31. The UE of any of clauses 29 to 30, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof.

[0225] Clause 32. The UE of any of clauses 29 to 31, wherein the SL-PRS assistance data comprises an indication of a maximum validity duration associated with one or more SL- PRS transmission parameters of the set of SL-PRS transmission parameters.

[0226] Clause 33. The UE of clause 32, wherein the maximum validity duration is associated with an exponential back-off timer.

[0227] Clause 34. The UE of any of clauses 29 to 33, wherein the message-specific information comprises validity area information.

[0228] Clause 35. The UE of clause 34, wherein the SL-PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0229] Clause 36. The UE of clause 35, wherein the first and second validity areas correspond to first and second sidelink zones, or wherein the first and second validity areas correspond to first and second lanes of traffic.

[0230] Clause 37. The UE of any of clauses 29 to 36, wherein the set of SL-PRS transmission parameter options corresponds to a pre-configured set of SL-PRS transmission parameter options. QC2303292WOQualcomm Ref. No.2303292WO

[0231] Clause 38. The UE of any of clauses 29 to 37, wherein the selection is based on a SL- PRS priority that is indicated by the message-specific information.

[0232] Clause 39. The UE of clause 38, wherein a first SL-PRS priority is associated with a first set of SL-PRS transmission parameter options, and wherein a second SL-PRS priority is associated with a second set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL- PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0233] Clause 40. The UE of any of clauses 29 to 39, wherein the message-specific information comprises one or more channel condition criteria.

[0234] Clause 41. The UE of clause 40, wherein the one or more processors, either alone or in combination, are further configured to: determine a channel condition, wherein the selection is further based on the channel condition and the one or more channel condition criteria.

[0235] Clause 42. The UE of clause 41, wherein the one or more channel condition criteria comprise a channel quality threshold, a channel busy ratio (CBR), or both, wherein the channel condition comprises a first channel quality above the channel quality threshold or a first CBR below the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a first set of SL-PRS transmission parameter options, or wherein the channel condition comprises a second channel quality less than or equal to the channel quality threshold or a second CBR greater than or equal to the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a second set of SL-PRS transmission parameter options that is different than the first set of SL-PRS transmission parameter options.

[0236] Clause 43. The UE of any of clauses 29 to 42, wherein the message is received from another UE or a roadside unit (RSU).

[0237] Clause 44. The UE of any of clauses 29 to 43, wherein the session-less SL-based position estimation procedure is associated with position estimation for the UE, another UE, a wireless node from which the message is received, or a combination thereof.

[0238] Clause 45. A wireless node, comprising: one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and QC2303292WOQualcomm Ref. No.2303292WO the one or more transceivers, the one or more processors, either alone or in combination, configured to: transmit, via the one or more transceivers, a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; and perform one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information.

[0239] Clause 46. The wireless node of clause 45, wherein the set of SL-PRS transmission parameters comprises: scramble identifier (ID), or comb -size, or comb-offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, slot offset, or frequency domain offset, or mini-slot selection inside a slot, or any combination thereof.

[0240] Clause 47. The wireless node of any of clauses 45 to 46, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof.

[0241] Clause 48. The wireless node of any of clauses 45 to 47, wherein the SL-PRS assistance data further comprises an indication of a maximum validity duration associated with one or more SL-PRS transmission parameters of the set of SL-PRS transmission parameters.

[0242] Clause 49. The wireless node of clause 48, wherein the maximum validity duration is associated with an exponential back-off timer.

[0243] Clause 50. The wireless node of any of clauses 45 to 49, wherein the message-specific information comprises validity area information.

[0244] Clause 51. The wireless node of clause 50, wherein the SL-PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for QC2303292WOQualcomm Ref. No.2303292WO selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0245] Clause 52. The wireless node of any of clauses 45 to 51, wherein the set of SL-PRS transmission parameter options corresponds to a pre-configured set of SL-PRS transmission parameter options.

[0246] Clause 53. The wireless node of any of clauses 45 to 52, wherein the message-specific information comprises SL-PRS priority.

[0247] Clause 54. The wireless node of any of clauses 45 to 53, wherein the message-specific information comprises one or more channel condition criteria.

[0248] Clause 55. The wireless node of clause 54, wherein the one or more channel condition criteria comprises a channel quality threshold, a channel busy ratio (CBR), or both.

[0249] Clause 56. The wireless node of any of clauses 45 to 55, wherein the wireless node corresponds to another UE or a roadside unit (RSU).

[0250] Clause 57. A user equipment (UE), comprising: means for receiving a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL- PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; means for selecting a set of SL-PRS transmission parameters from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information; and means for performing the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters.

[0251] Clause 58. The UE of clause 57, wherein the set of SL-PRS transmission parameters comprises: means for scrambling identifier (ID), or means for combing -size, or comb- offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, slot offset, or frequency domain offset, or mini-slot selection inside a slot, or any combination thereof.

[0252] Clause 59. The UE of any of clauses 57 to 58, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof. QC2303292WOQualcomm Ref. No.2303292WO

[0253] Clause 60. The UE of any of clauses 57 to 59, wherein the SL-PRS assistance data comprises an indication of a maximum validity duration associated with one or more SL- PRS transmission parameters of the set of SL-PRS transmission parameters.

[0254] Clause 61. The UE of clause 60, wherein the maximum validity duration is associated with an exponential back-off timer.

[0255] Clause 62. The UE of any of clauses 57 to 61, wherein the message-specific information comprises validity area information.

[0256] Clause 63. The UE of clause 62, wherein the SL-PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0257] Clause 64. The UE of clause 63, wherein the first and second validity areas correspond to first and second sidelink zones, or wherein the first and second validity areas correspond to first and second lanes of traffic.

[0258] Clause 65. The UE of any of clauses 57 to 64, wherein the set of SL-PRS transmission parameter options corresponds to a pre-configured set of SL-PRS transmission parameter options.

[0259] Clause 66. The UE of any of clauses 57 to 65, wherein the selection is based on a SL- PRS priority that is indicated by the message-specific information.

[0260] Clause 67. The UE of clause 66, wherein a first SL-PRS priority is associated with a first set of SL-PRS transmission parameter options, and wherein a second SL-PRS priority is associated with a second set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL- PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0261] Clause 68. The UE of any of clauses 57 to 67, wherein the message-specific information comprises one or more channel condition criteria. QC2303292WOQualcomm Ref. No.2303292WO

[0262] Clause 69. The UE of clause 68, further comprising: means for determining a channel condition, wherein the selection is further based on the channel condition and the one or more channel condition criteria.

[0263] Clause 70. The UE of clause 69, wherein the one or more channel condition criteria comprise a channel quality threshold, a channel busy ratio (CBR), or both, wherein the channel condition comprises a first channel quality above the channel quality threshold or a first CBR below the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a first set of SL-PRS transmission parameter options, or wherein the channel condition comprises a second channel quality less than or equal to the channel quality threshold or a second CBR greater than or equal to the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a second set of SL-PRS transmission parameter options that is different than the first set of SL-PRS transmission parameter options.

[0264] Clause 71. The UE of any of clauses 57 to 70, wherein the message is received from another UE or a roadside unit (RSU).

[0265] Clause 72. The UE of any of clauses 57 to 71, wherein the session-less SL-based position estimation procedure is associated with position estimation for the UE, another UE, a wireless node from which the message is received, or a combination thereof.

[0266] Clause 73. A wireless node, comprising: means for transmitting a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; and means for performing one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information.

[0267] Clause 74. The wireless node of clause 73, wherein the set of SL-PRS transmission parameters comprises: means for scrambling identifier (ID), or means for combing -size, or comb-offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, QC2303292WOQualcomm Ref. No.2303292WO slot offset, or frequency domain offset, or mini-slot selection inside a slot, or any combination thereof.

[0268] Clause 75. The wireless node of any of clauses 73 to 74, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof.

[0269] Clause 76. The wireless node of any of clauses 73 to 75, wherein the SL-PRS assistance data further comprises an indication of a maximum validity duration associated with one or more SL-PRS transmission parameters of the set of SL-PRS transmission parameters.

[0270] Clause 77. The wireless node of clause 76, wherein the maximum validity duration is associated with an exponential back-off timer.

[0271] Clause 78. The wireless node of any of clauses 73 to 77, wherein the message-specific information comprises validity area information.

[0272] Clause 79. The wireless node of clause 78, wherein the SL-PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0273] Clause 80. The wireless node of any of clauses 73 to 79, wherein the set of SL-PRS transmission parameter options corresponds to a pre-configured set of SL-PRS transmission parameter options.

[0274] Clause 81. The wireless node of any of clauses 73 to 80, wherein the message-specific information comprises SL-PRS priority.

[0275] Clause 82. The wireless node of any of clauses 73 to 81, wherein the message-specific information comprises one or more channel condition criteria.

[0276] Clause 83. The wireless node of clause 82, wherein the one or more channel condition criteria comprises a channel quality threshold, a channel busy ratio (CBR), or both.

[0277] Clause 84. The wireless node of any of clauses 73 to 83, wherein the wireless node corresponds to another UE or a roadside unit (RSU). QC2303292WOQualcomm Ref. No.2303292WO

[0278] Clause 85. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a user equipment (UE), cause the UE to: receive a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; select a set of SL-PRS transmission parameters from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information; and perform the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters.

[0279] Clause 86. The non-transitory computer-readable medium of clause 85, wherein the set of SL-PRS transmission parameters comprises: scramble identifier (ID), or comb -size, or comb-offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, slot offset, or frequency domain offset, or mini-slot selection inside a slot, or any combination thereof.

[0280] Clause 87. The non-transitory computer-readable medium of any of clauses 85 to 86, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof.

[0281] Clause 88. The non-transitory computer-readable medium of any of clauses 85 to 87, wherein the SL-PRS assistance data comprises an indication of a maximum validity duration associated with one or more SL-PRS transmission parameters of the set of SL- PRS transmission parameters.

[0282] Clause 89. The non-transitory computer-readable medium of clause 88, wherein the maximum validity duration is associated with an exponential back-off timer.

[0283] Clause 90. The non-transitory computer-readable medium of any of clauses 85 to 89, wherein the message-specific information comprises validity area information.

[0284] Clause 91. The non-transitory computer-readable medium of clause 90, wherein the SL- PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the second validity area is associated with a second set of set QC2303292WOQualcomm Ref. No.2303292WO of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0285] Clause 92. The non-transitory computer-readable medium of clause 91, wherein the first and second validity areas correspond to first and second sidelink zones, or wherein the first and second validity areas correspond to first and second lanes of traffic.

[0286] Clause 93. The non-transitory computer-readable medium of any of clauses 85 to 92, wherein the set of SL-PRS transmission parameter options corresponds to a pre- configured set of SL-PRS transmission parameter options.

[0287] Clause 94. The non-transitory computer-readable medium of any of clauses 85 to 93, wherein the selection is based on a SL-PRS priority that is indicated by the message- specific information.

[0288] Clause 95. The non-transitory computer-readable medium of clause 94, wherein a first SL-PRS priority is associated with a first set of SL-PRS transmission parameter options, and wherein a second SL-PRS priority is associated with a second set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0289] Clause 96. The non-transitory computer-readable medium of any of clauses 85 to 95, wherein the message-specific information comprises one or more channel condition criteria.

[0290] Clause 97. The non-transitory computer-readable medium of clause 96, further comprising computer-executable instructions that, when executed by the UE, cause the UE to: determine a channel condition, wherein the selection is further based on the channel condition and the one or more channel condition criteria.

[0291] Clause 98. The non-transitory computer-readable medium of clause 97, wherein the one or more channel condition criteria comprise a channel quality threshold, a channel busy ratio (CBR), or both, wherein the channel condition comprises a first channel quality above the channel quality threshold or a first CBR below the CBR threshold, and the set QC2303292WOQualcomm Ref. No.2303292WO of SL-PRS transmission parameter options corresponds to a first set of SL-PRS transmission parameter options, or wherein the channel condition comprises a second channel quality less than or equal to the channel quality threshold or a second CBR greater than or equal to the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a second set of SL-PRS transmission parameter options that is different than the first set of SL-PRS transmission parameter options.

[0292] Clause 99. The non-transitory computer-readable medium of any of clauses 85 to 98, wherein the message is received from another UE or a roadside unit (RSU).

[0293] Clause 100. The non-transitory computer-readable medium of any of clauses 85 to 99, wherein the session-less SL-based position estimation procedure is associated with position estimation for the UE, another UE, a wireless node from which the message is received, or a combination thereof.

[0294] Clause 101. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a wireless node, cause the wireless node to: transmit a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL- PRS transmission parameter options available for selection by the UE; and perform one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information.

[0295] Clause 102. The non-transitory computer-readable medium of clause 101, wherein the set of SL-PRS transmission parameters comprises: scramble identifier (ID), or comb -size, or comb-offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, slot offset, or frequency domain offset, or mini-slot selection inside a slot, or any combination thereof.

[0296] Clause 103. The non-transitory computer-readable medium of any of clauses 101 to 102, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID QC2303292WOQualcomm Ref. No.2303292WO associated with the message, a transmitting zone-ID associated with the message, or any combination thereof.

[0297] Clause 104. The non-transitory computer-readable medium of any of clauses 101 to 103, wherein the SL-PRS assistance data further comprises an indication of a maximum validity duration associated with one or more SL-PRS transmission parameters of the set of SL-PRS transmission parameters.

[0298] Clause 105. The non-transitory computer-readable medium of clause 104, wherein the maximum validity duration is associated with an exponential back-off timer.

[0299] Clause 106. The non-transitory computer-readable medium of any of clauses 101 to 105, wherein the message-specific information comprises validity area information.

[0300] Clause 107. The non-transitory computer-readable medium of clause 106, wherein the SL-PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

[0301] Clause 108. The non-transitory computer-readable medium of any of clauses 101 to 107, wherein the set of SL-PRS transmission parameter options corresponds to a pre- configured set of SL-PRS transmission parameter options.

[0302] Clause 109. The non-transitory computer-readable medium of any of clauses 101 to 108, wherein the message-specific information comprises SL-PRS priority.

[0303] Clause 110. The non-transitory computer-readable medium of any of clauses 101 to 109, wherein the message-specific information comprises one or more channel condition criteria.

[0304] Clause 111. The non-transitory computer-readable medium of clause 110, wherein the one or more channel condition criteria comprises a channel quality threshold, a channel busy ratio (CBR), or both.

[0305] Clause 112. The non-transitory computer-readable medium of any of clauses 101 to 111, wherein the wireless node corresponds to another UE or a roadside unit (RSU). QC2303292WOQualcomm Ref. No.2303292WO

[0306] Those of skill in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0307] Further, those of skill in the art will appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the aspects disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

[0308] The various illustrative logical blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an ASIC, a field-programable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0309] The methods, sequences and / or algorithms described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in random access memory (RAM), flash memory, read-only memory (ROM), erasable QC2303292WOQualcomm Ref. No.2303292WO programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An example storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal (e.g., UE). In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

[0310] In one or more example aspects, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0311] While the foregoing disclosure shows illustrative aspects of the disclosure, it should be noted that various changes and modifications could be made herein without departing from the scope of the disclosure as defined by the appended claims. For example, the QC2303292WOQualcomm Ref. No.2303292WO functions, steps and / or actions of the method claims in accordance with the aspects of the disclosure described herein need not be performed in any particular order. Further, no component, function, action, or instruction described or claimed herein should be construed as critical or essential unless explicitly described as such. Furthermore, as used herein, the terms “set,” “group,” and the like are intended to include one or more of the stated elements. Also, as used herein, the terms “has,” “have,” “having,” “comprises,” “comprising,” “includes,” “including,” and the like does not preclude the presence of one or more additional elements (e.g., an element “having” A may also have B). Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and / or,” unless explicitly stated otherwise (e.g., if used in combination with “either” or “only one of”) or the alternatives are mutually exclusive (e.g., “one or more” should not be interpreted as “one and more”). Furthermore, although components, functions, actions, and instructions may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated. Accordingly, as used herein, the articles “a,” “an,” “the,” and “said” are intended to include one or more of the stated elements. Additionally, as used herein, the terms “at least one” and “one or more” encompass “one” component, function, action, or instruction performing or capable of performing a described or claimed functionality and also “two or more” components, functions, actions, or instructions performing or capable of performing a described or claimed functionality in combination. QC2303292WO

Claims

Qualcomm Ref. No.2303292WO CLAIMS What is claimed is:

1. A method of operating a user equipment (UE), comprising: receiving a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; selecting a set of SL-PRS transmission parameters from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message- specific information; and performing the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters.

2. The method of claim 1, wherein the set of SL-PRS transmission parameters comprises: scrambling identifier (ID), or comb-size, or comb-offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, slot offset, or frequency domain offset, or mini-slot selection inside a slot, or any combination thereof.

3. The method of claim 1, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof. QC2303292WOQualcomm Ref. No.2303292WO 4. The method of claim 1, wherein the SL-PRS assistance data comprises an indication of a maximum validity duration associated with one or more SL-PRS transmission parameters of the set of SL-PRS transmission parameters.The method of claim 4, wherein the maximum validity duration is associated with an exponential back-off timer.

6. The method of claim 1, wherein the message-specific information comprises validity area information.

7. The method of claim 6, wherein the SL-PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

8. The method of claim 7, wherein the first and second validity areas correspond to first and second sidelink zones, or wherein the first and second validity areas correspond to first and second lanes of traffic.

9. The method of claim 1, wherein the set of SL-PRS transmission parameter options corresponds to a pre-configured set of SL-PRS transmission parameter options. QC2303292WOQualcomm Ref. No.2303292WO 10. The method of claim 1, wherein the selection is based on a SL-PRS priority that is indicated by the message-specific information.

11. The method of claim 10, wherein a first SL-PRS priority is associated with a first set of SL-PRS transmission parameter options, and wherein a second SL-PRS priority is associated with a second set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

12. The method of claim 1, wherein the message-specific information comprises one or more channel condition criteria.

13. The method of claim 12, further comprising: determining a channel condition, wherein the selection is further based on the channel condition and the one or more channel condition criteria.

14. The method of claim 13, wherein the one or more channel condition criteria comprise a channel quality threshold, a channel busy ratio (CBR), or both, wherein the channel condition comprises a first channel quality above the channel quality threshold or a first CBR below the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a first set of SL-PRS transmission parameter options, or wherein the channel condition comprises a second channel quality less than or equal to the channel quality threshold or a second CBR greater than or equal to the CBR threshold, and the set of SL-PRS transmission parameter options corresponds to a second QC2303292WOQualcomm Ref. No.2303292WO set of SL-PRS transmission parameter options that is different than the first set of SL- PRS transmission parameter options.

15. The method of claim 1, wherein the message is received from another UE or a roadside unit (RSU).

16. The method of claim 1, wherein the session-less SL-based position estimation procedure is associated with position estimation for the UE, another UE, a wireless node from which the message is received, or a combination thereof.

17. A method of operating a wireless node, comprising: transmitting a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; and performing one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information.

18. The method of claim 17, wherein the set of SL-PRS transmission parameters comprises: scrambling identifier (ID), or comb-size, or comb-offset, or number of PRS symbols, or symbol offset within a slot or a mini-slot, slot offset, or frequency domain offset, or mini-slot selection inside a slot, or QC2303292WOQualcomm Ref. No.2303292WO any combination thereof.

19. The method of claim 17, wherein the message-specific information comprises a source identifier (ID) associated with the message, a destination ID associated with the message, a source zone-ID associated with the message, a transmitting zone-ID associated with the message, or any combination thereof.

20. The method of claim 17, wherein the SL-PRS assistance data further comprises an indication of a maximum validity duration associated with one or more SL- PRS transmission parameters of the set of SL-PRS transmission parameters.

21. The method of claim 20, wherein the maximum validity duration is associated with an exponential back-off timer.

22. The method of claim 17, wherein the message-specific information comprises validity area information.

23. The method of claim 22, wherein the SL-PRS assistance data comprises indications of a first validity area and a second validity area, wherein the first validity area is associated with a first set of SL-PRS transmission parameter options, wherein the second validity area is associated with a second set of set of SL-PRS transmission parameter options that is different from the first set of SL-PRS transmission parameter options, and wherein the set of SL-PRS transmission parameter options available for selection by the UE corresponds to the first set of SL-PRS transmission parameter options or the second set of SL-PRS transmission parameter options.

24. The method of claim 17, wherein the set of SL-PRS transmission parameter options corresponds to a pre-configured set of SL-PRS transmission parameter options. QC2303292WOQualcomm Ref. No.2303292WO 25. The method of claim 17, wherein the message-specific information comprises SL-PRS priority.

26. The method of claim 17, wherein the message-specific information comprises one or more channel condition criteria.

27. The method of claim 26, wherein the one or more channel condition criteria comprises a channel quality threshold, a channel busy ratio (CBR), or both.

28. The method of claim 17, wherein the wireless node corresponds to another UE or a roadside unit (RSU).

29. A user equipment (UE), comprising: one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: receive, via the one or more transceivers, a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission for a session- less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; select a set of SL-PRS transmission parameters from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message- specific information; and perform the SL-PRS transmission in accordance with the set of SL-PRS transmission parameters. QC2303292WOQualcomm Ref. No.2303292WO 30. A wireless node, comprising: one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: transmit, via the one or more transceivers, a message via multicast or broadcast that requests a sidelink positioning reference signal (SL-PRS) transmission by a set of user equipment (UEs) for a session-less SL-based position estimation procedure and comprises SL-PRS assistance data for the SL-PRS transmission, wherein the SL-PRS assistance data comprises an indication of a set of SL-PRS transmission parameter options available for selection by the UE; and perform one or more positioning measurements associated with the SL-PRS transmission from at least one UE in accordance with a set of SL-PRS transmission parameters that is selected from the set of SL-PRS transmission parameter options pseudo-randomly or deterministically based on message-specific information. QC2303292WO

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