Optimizing positioning performance for indoor versus outdoor devices

Abstract

In an aspect, a method of wireless communication performed by a network node includes obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determining a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

Description

Qualcomm Ref. No.2208730WO OPTIMIZING POSITIONING PERFORMANCE FOR INDOOR VERSUS OUTDOOR DEVICES BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure

[0001] Aspects of the disclosure relate generally to wireless positioning. 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 QC2208730WOQualcomm Ref. No.2208730WO 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 wireless communication performed by a network node includes obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determining a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

[0006] In an aspect, a method of wireless communication performed by a network node includes obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determining a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

[0007] In an aspect, a network node includes a memory; at least one transceiver; and at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

[0008] In an aspect, a network node includes a memory; at least one transceiver; and at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, QC2208730WOQualcomm Ref. No.2208730WO an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

[0009] In an aspect, a network node includes means for obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and means for determining a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

[0010] In an aspect, a network node includes means for obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and means for determining a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

[0011] In an aspect, a non-transitory computer-readable medium stores computer-executable instructions that, when executed by a network node, cause the network node to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

[0012] In an aspect, a non-transitory computer-readable medium stores computer-executable instructions that, when executed by a network node, cause the network node to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

[0013] In an aspect, certain types of RS measurements may be included or excluded from the computations in the positioning engine on the basis of indoor / outdoor classification of the UEs. In this manner, the computational burden associated with providing the position estimate may be reduced, thereby conserving power and reducing latency. In an aspect, different types of RS measurements for indoor UEs versus outdoor UEs may be fused to QC2208730WOQualcomm Ref. No.2208730WO enhance, reduce, or eliminate the impact of the different types of RS measurements in a positioning estimate based on the classification of the UEs. In an aspect, the accuracy of a position estimate for a target UE is boosted by the selective fusion of the different types of RS measurements for indoor UEs versus outdoor UEs. Additionally, the computational load and latency associated with determining a position estimate when using different sets of RS measurement types for indoor UEs versus outdoor UEs may be reduced. Further, the UE may consume less power using the disclosed aspects.

[0014] 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

[0015] 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.

[0016] FIG. 1 illustrates an example wireless communications system, according to aspects of the disclosure.

[0017] FIGS.2A, 2B, and 2C illustrate example wireless network structures, according to aspects of the disclosure.

[0018] 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.

[0019] FIG. 4 is a diagram illustrating an example frame structure, according to aspects of the disclosure.

[0020] FIG.5 illustrates examples of various positioning methods supported in New Radio (NR), according to aspects of the disclosure.

[0021] FIG. 6 illustrates a multi-technology positioning engine (MTPE) according to some aspects of the disclosure.

[0022] FIG. 7 depicts a message flow between a network server and a during a network-based indoor / outdoor classification of the UE, according to aspects of the disclosure.

[0023] FIG. 8 depicts a message flow between a network server and a UE during a network- based indoor / outdoor classification of the UE, according to aspects of the disclosure.

[0024] FIG. 9 is an example method of wireless communication performed by a network node, according to aspects of the disclosure. QC2208730WOQualcomm Ref. No.2208730WO

[0025] FIG.10 is an example method of wireless communication performed by a network node, according to aspects of the disclosure. DETAILED DESCRIPTION

[0026] Disclosed are techniques for wireless positioning. In an aspect, an inter-technology filtering block may receive, from each of a plurality of intra-technology filtering blocks of different technology types, a set of intra-technology inlier positioning anchor points (e.g., anchor points providing measurements within a statistical range of measurements received from other anchor points) of the respective technology type. The inter- technology filtering block may perform outlier rejection across all of the intra-technology positioning anchor points together to produce a set of inter-technology inlier anchor points. The inter-technology filtering block may determine a relative weight for each inter-technology inlier anchor point. The inter-technology filtering block may provide, to at least one of the plurality of intra-technology filtering blocks, feedback that is based on at least one of the relative weights. The inter-technology filtering block and / or the intra-technology filtering blocks may be components of a user equipment, a base station, and / or a network entity.

[0027] 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.

[0028] 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.

[0029] 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, QC2208730WOQualcomm Ref. No.2208730WO or any combination thereof, depending in part on the particular application, in part on the desired design, in part on the corresponding technology, etc.

[0030] 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.

[0031] 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 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. QC2208730WOQualcomm Ref. No.2208730WO

[0032] 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 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.

[0033] 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) 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.

[0034] 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, QC2208730WOQualcomm Ref. No.2208730WO 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).

[0035] 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.

[0036] 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, 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.

[0037] 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 QC2208730WOQualcomm Ref. No.2208730WO 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.

[0038] 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.

[0039] 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 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. QC2208730WOQualcomm Ref. No.2208730WO

[0040] 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).

[0041] 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).

[0042] 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.

[0043] 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. QC2208730WOQualcomm Ref. No.2208730WO

[0044] 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.

[0045] 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 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.

[0046] 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 QC2208730WOQualcomm Ref. No.2208730WO 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.

[0047] 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 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.

[0048] 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.

[0049] 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 QC2208730WOQualcomm Ref. No.2208730WO 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.

[0050] 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) band (30 GHz – 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

[0051] 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.

[0052] 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. QC2208730WOQualcomm Ref. No.2208730WO

[0053] 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 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.

[0054] 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.

[0055] 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 QC2208730WOQualcomm Ref. No.2208730WO 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.

[0056] 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) 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.

[0057] 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 QC2208730WOQualcomm Ref. No.2208730WO 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.

[0058] 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 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.

[0059] 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.

[0060] 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- QC2208730WOQualcomm Ref. No.2208730WO 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.

[0061] 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 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.

[0062] 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), WiFi Direct (WiFi-D), Bluetooth®, and so on.

[0063] 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 QC2208730WOQualcomm Ref. No.2208730WO 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).

[0064] 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 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).

[0065] 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 QC2208730WOQualcomm Ref. No.2208730WO 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 264 also supports functionalities for non-3GPP (Third Generation Partnership Project) access networks.

[0066] 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.

[0067] 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.

[0068] 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 QC2208730WOQualcomm Ref. No.2208730WO 20 270 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 (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).

[0069] 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.

[0070] 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.

[0071] 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 QC2208730WOQualcomm Ref. No.2208730WO 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 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.

[0072] 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.

[0073] 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).

[0074] Base station-type operation or network design may consider aggregation characteristics of base station functionality. For example, disaggregated base stations may be utilized in QC2208730WOQualcomm Ref. No.2208730WO an integrated access backhaul (IAB) network, an open radio access network (O-RAN (such as the network configuration sponsored by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)). Disaggregation may include distributing functionality across two or more units at various physical locations, as well as distributing functionality for at least one unit virtually, which can enable flexibility in network design. The various units of the disaggregated base station, or disaggregated RAN architecture, can be configured for wired or wireless communication with at least one other unit.

[0075] 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 distributed units (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.

[0076] 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 QC2208730WOQualcomm Ref. No.2208730WO 23 radio frequency (RF) transceiver), configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.

[0077] In some aspects, the CU 280 may host one or more higher layer control functions. Such control functions can include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 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.

[0078] 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 radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation 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.

[0079] 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 QC2208730WOQualcomm Ref. No.2208730WO 24 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.

[0080] 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.

[0081] 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.

[0082] 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 QC2208730WOQualcomm Ref. No.2208730WO 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 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).

[0083] 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.

[0084] 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), QC2208730WOQualcomm Ref. No.2208730WO respectively, and, conversely, for receiving and decoding signals 318 and 358 (e.g., 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.

[0085] 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., WiFi, LTE-D, 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 WiFi 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.

[0086] 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, QC2208730WOQualcomm Ref. No.2208730WO 27 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.

[0087] 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.

[0088] 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 transmitter circuitry (e.g., transmitters 314, 324, 354, 364) may include or be coupled to QC2208730WOQualcomm Ref. No.2208730WO 28 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.

[0089] 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.

[0090] 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 processing units (CPUs), ASICs, digital signal processors (DSPs), field programmable QC2208730WOQualcomm Ref. No.2208730WO gate arrays (FPGAs), other programmable logic devices or processing circuitry, or various combinations thereof.

[0091] 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 positioning component 342, 388, and 398, respectively. The 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 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 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 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 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 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.

[0092] 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 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 QC2208730WOQualcomm Ref. No.2208730WO 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.

[0093] 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.

[0094] 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 transport channels, scheduling information reporting, error correction, priority handling, and logical channel prioritization.

[0095] 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 QC2208730WOQualcomm Ref. No.2208730WO (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.

[0096] 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 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. QC2208730WOQualcomm Ref. No.2208730WO 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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 information modulated onto an RF carrier and provides the information to the one or more processors 384.

[0101] 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 QC2208730WOQualcomm Ref. No.2208730WO processors 384 may be provided to the core network. The one or more processors 384 are also responsible for error detection.

[0102] 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 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.

[0103] 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.

[0104] 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 QC2208730WOQualcomm Ref. No.2208730WO 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 positioning component 342, 388, and 398, etc.

[0105] 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 WiFi).

[0106] FIG. 4 is a diagram illustrating an example frame structure, according to aspects of the disclosure. 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 may be a downlink or uplink frame structure. Other wireless communications technologies may have different frame structures and / or different channels.

[0107] 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 QC2208730WOQualcomm Ref. No.2208730WO 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.

[0108] 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 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.

[0109] 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. QC2208730WOQualcomm Ref. No.2208730WO

[0110] 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.

[0111] 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”).

[0112] FIG.5 illustrates examples of various positioning methods supported in New Radio (NR), according to aspects of the disclosure. 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. FIG.5 illustrates examples of various positioning methods, according to aspects of the disclosure. In an OTDOA or DL-TDOA positioning procedure, illustrated by scenario 510, 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 QC2208730WOQualcomm Ref. No.2208730WO 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.

[0113] For DL-AoD positioning, illustrated by scenario 520, 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).

[0114] 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 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.

[0115] 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.

[0116] 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 QC2208730WOQualcomm Ref. No.2208730WO 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, illustrated by scenario 530, 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 combined with other positioning techniques, such as UL-AoA and DL-AoD, to improve location accuracy, as illustrated by scenario 540.

[0117] 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).

[0118] 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.

[0119] 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, QC2208730WOQualcomm Ref. No.2208730WO 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.

[0120] 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 volume within which the location is expected to be included with some specified or default level of confidence).

[0121] When multiple sets of positioning measurements are available at a device, utilizing a subset of them can provide better performance, as compared to utilizing all the measurements to arrive at a position estimate. For example, if one of the measurements may be very noisy, or is associated with a non-line-of-sight (NLOS) channel, then ignoring this measurement from the position estimation process would be favorable for improving the accuracy. In another example, while 5G transmission / reception points (TRPs) tend to have an accurate ground truth, a WiFi access point (WAP) may not; using the incorrect ground truth from such a WAP for a positioning process may negatively affect the position estimation accuracy of a target node. Thus, it is desirable to develop a positioning engine that can fuse measurements across several technologies (cellular, WiFi, UWB, GNSS, etc.).

[0122] Accordingly, a multi-technology positioning engine (MTPE) is herein presented. The MTPE may be viewed as a set of intra-technology filtering blocks, followed by an inter- technology filtering block that can fuse measurements across multiple technologies. Feedback from the inter-technology fusion block can help identify certain trends in the relative performance between the various technologies. Moreover, strategies to optimize the performance of the MTPE, in terms of the level of computations required and the associated latency and power consumption costs, are also herein presented. QC2208730WOQualcomm Ref. No.2208730WO

[0123] FIG.6 illustrates a MTPE 600 according to some aspects of the disclosure. In the example illustrated in FIG. 6, MTPE 600 includes two intra-technology filtering blocks 602, generically labeled “Technology A” and “Technology B”, but which represent any two technologies that support positioning measurements, e.g., cellular, WiFi, UWB, GNSS, etc. Although FIG. 6 illustrates two intra-technology filtering blocks 602, the same concept may be applied to any number of inter-technology filtering blocks. In the example shown in FIG.6, each intra-technology filtering block 602 performs the steps of ranking and / or pruning anchors (e.g., a UE or other network device supporting positioning of a target UE, e.g., by transmitting and / or receiving reference signals for positioning, providing positioning-related information, etc.) based on a quality criterion (block 604) and performs intra-technology anchor outlier rejection (block 606). This results in what is referred to as the inlier set of anchors, which may be referred to as the inlier anchors or as the inlier set.

[0124] As further shown in FIG. 6, the MTPE 600 also includes an inter-technology filtering block 608, which concatenates the inlier anchors across technologies and performs an outlier rejection across a sweep of the number of anchors contained within the inlier set (block 610) and performs a cost function error minimization, such as a weighted linear average of cost components across technologies and measurement types (block 612). In some aspects, cost function error minimization may use the following equation:where: ൫^^, ^^൯ represent a set of measurements of varying types, e.g., AoA, ToA,^^and ^^represent weights, and^^൯ is the weighted cost function

[0125] As further shown in FIG.6, the inter-technology filtering block 608 provides feedback to the intra-technology filtering blocks 602. In some aspects, feedback from the inter- technology filtering block 608 can trigger the update of the inlier set for a specific intra- technology filtering block 602. In some aspects, this feedback may be in the form of a set of normalized weights, where each intra-technology filtering block 602 is associated with a weight. For example, one of the intra-technology filtering blocks 602 may be associated with a lower weight (as compared to others), which in turn implies that the corresponding technology is not as useful as the others. This can trigger an update of the inlier set to QC2208730WOQualcomm Ref. No.2208730WO improve performance. In some aspects, each intra-technology filtering block 602 can be associated with its own weight threshold for triggering an update of its inlier set.

[0126] According to some aspects of the present disclosure, methods for feedback-based decisions in a multi-technology positioning engine may include a determination that a technology is providing little to no additional value, e.g., that the positioning information from that technology does not improve the accuracy of the position determined by the inter-technology filtering block 608. In some aspects, this may include a determination that frequently triggering an update of the intra-technology inliers for a particular technology also does not improve positioning accuracy. For example, a UE may be located within a building, tunnel, or other structure that blocks the reception of GNSS or cellular signals, but the UE may still easily receive WiFi or UWB signals. In this case, a particular technology – i.e., GNSS and / or cellular – is simply unable to provide information that could improve the positioning estimate. For the purposes of brevity of description, when a technology cannot or does not provide information that could improve the positioning estimate, that technology may be referred to herein as being inferior. It will be understood that inferiority may be a transient, rather than permanent, condition.

[0127] In some aspects, when a technology is or becomes inferior, dependency on that technology may be reduced. In some aspects, this involves defining a periodic time interval at which an intra-technology filtering block 602 performs an inlier update and provides the updated inlier list to the inter-technology filtering block 608. When the specific technology becomes inferior, e.g., when one or more weights assigned to that specific technology are low in comparison to weights assigned to other technologies, then the periodic time interval associated with that specific technology may be increased. That is, the information coming from that specific technology filtering block is received and used less often. In some aspects, if the quality of the information that is coming from the inferior technology block improves over time, e.g., such that technology block is no longer inferior, then the periodic time interval associated with that specific technology may be decreased, causing the information coming from that specific technology filtering block to be received and used more often.^

[0128] In some aspects, the following algorithm may be used. Using technology block A as an example, the inter-technology filtering block 608 will generate a weight WA for that block. In some aspects, a threshold value V1 is defined such that if WA > V1, then data from intra-technology filtering block 602 for technology A is always considered by the QC2208730WOQualcomm Ref. No.2208730WO inter-technology filtering block 608. If WA ^ V1, however, then data from intra- technology filtering block 602 for technology A considered only periodically by the inter- technology filtering block 608, e.g., with a periodicity P. In some aspects, a second threshold value V2 is defined such that V2 < V1; if WA > V2, then the value of P is reduced (that is, that particular technology is considered more often), and if WA ^ V2, then the value of P is increased (that is, that particular technology is considered less often). In some aspects, a third threshold value V3 is defined such that V3 < V2; if WA < V3, then technology A is not used at all. In some aspects, the value of V1(and the values of V2and V3, if used) may be technology-specific, region-specific, or both. In some aspects, the value of P may be adjusted using an additive-increase, multiplicative decrease (AIMD) approach. ^

[0129] According to some aspects of the present disclosure, methods for feedback-based decisions in a multi-technology positioning engine may include having the intra- technology filtering block 602 use a preferred set of anchors ^^, identified by the inter- technology filtering block 608, as a starting point for the processes performed by block 604 and block 606.

[0130] In some aspects, the preferred set of anchors ^^ may be a subset of the set of inliers that was previously provided to the inter-technology filtering block 608 by the intra- technology filtering block 602. For example, an intra-technology filtering block 602 may perform a random selection of anchors from all available anchors to create a subset of anchors that is then subject to the ranking, pruning, and outlier rejection processes in blocks 604 and 606. This is typically done when there are a large number of anchors to select from and it is not feasible to go through all possible combinations of subsets of anchors to determine the best candidates for inlier anchors. Moreover, a new set of anchors may be randomly selected from all available anchors every time the intra- technology filtering block 602 generates the set of inliers that are provided to the inter- technology filtering block 608.

[0131] While such a random selection strategy may overcome processing or time limitations, it may miss some of the anchors that are already known to be high quality: i.e., the random selection strategy by the intra-technology filtering block 602 may not include all of the anchors in the set ^^. Moreover, the inter-technology filtering block 608 may determine that some of the poorer-quality anchors for technology A are better than some of the QC2208730WOQualcomm Ref. No.2208730WO better-quality anchors in another technology, and may therefore select, for the set ^^, some anchors that the intra-technology filtering block 602 may have rejected as being of insufficient quality.

[0132] In some aspects, the intra-technology filtering block 602 may start with the set ^^ received from the inter-technology filtering block 608 and then supplement that set by random selection from the remaining candidate anchors to produce the inliers that are output from the intra-technology filtering block 602 to the inter-technology filtering block 608. This approach combines the advantage that the inlier selection process starts with at least some known-good anchors with the advantage that the random selection process may find one or more anchors that are better than, or at least as good as, the anchors currently included in the inliers list provided by the intra-technology filtering blocks 602.

[0133] According to some aspects of the present disclosure, methods for feedback-based decisions in a multi-technology positioning engine may include adapting the level of dependency on specific anchors belonging to a specific technology. In this technique, the relative quality of one specific technology versus another specific technology is measured and used to make adjustments to the inlier selection processes.

[0134] In some aspects, a deviation metric is provided by the inter-technology filtering block 608 to an intra-technology filtering block 602. In some aspects, the deviation metric for a particular technology A is defined to be the distance between the position estimate obtained only using information from technology A and the average of the position estimates obtained using each of the other technologies. This may be calculated according to the equation:where ^ is the total number of technologies being hybridized, and ^^is the position estimate obtained using technology ^ alone.

[0135] It may happen that ^^is large although technology ^ still improves performance after fusion (^^is not small). An example scenario is when ^’s inlier set comprises anchors that jointly provide a poor position estimate, but a subset of them when hybridized with anchors of other technologies, improves performance.

[0136] This feedback, along with the preferred set of ^’s anchors ^^, can help offset and improve the performance of intra-technology filtering block 602 corresponding to technology ^. QC2208730WOQualcomm Ref. No.2208730WO In some aspects, the intra-technology filtering block 602 may simply retain the set ^^ as its output set of inliers, rather than performing computations to find an updated inlier set. In some aspects, a threshold may be defined on ^^to decide whether to perform computations or not in the intra-technology filtering block 602. In some aspects, a periodicity and associated threshold may also be defined. In some aspects, the periodicity and / or the associated threshold may be dynamically adjusted.

[0137] The positioning engine 600 disclosed herein can fuse measurements across several technologies (cellular, WiFi, UWB, GNSS, etc.). When various positioning measurements are available from multiple technologies at a device, utilizing a subset of the measurements may provide better performance, as compared to utilizing all the measurements to arrive at a position estimate. For example, certain measurements may be very noisy or associated with a non-line-of-site (NLoS) channel. Eliminating noisy or NLoS channel measurements from the position estimation process may improve the accuracy of the position estimate. In another example, one of the anchor UEs may be associated with an incorrect ground truth, which in turn affects the position estimation accuracy of a target node. Ignoring anchor UEs having outlying ground truths may provide better position estimates. Still further, the dilution of precision can be improved by using a subset of anchors across different technologies.

[0138] Certain aspects of the disclosure are directed to positioning techniques and computations within a positioning engine and how such techniques may be enhanced based on whether a UE is located in an indoor environment or an outdoor environment. In accordance with an aspect of the disclosure, a network node (e.g., location server, UE, network server, etc.) may obtain reference signal (e.g., PRS) measurements associated with a plurality of UEs. The network node may determine a position estimate for a target UE based on applying at least one bias correction factor to the RS measurements associated with one or more indoor UEs of the plurality of UEs.

[0139] Certain positioning environments may include a combination of indoor and outdoor UEs. In such hybrid environments, the network node may limit the application of bias correction factors to only the RS measurements associated with indoor UEs while excluding the application of any bias correction factors to the RS measurements associated with outdoor UEs. Applying such bias correction factors using indoor UEs can improve performance as compared to applying bias correction factors using a mixture QC2208730WOQualcomm Ref. No.2208730WO of indoor and outdoor UEs. Alternatively, the network node may apply a first set of one or more bias correction factors to the RS measurements associated with the indoor UEs and a second set of one or more bias correction factors to the RS measurements associated with the outdoor UEs.

[0140] Additionally, or in the alternative, the network node may obtain RS measurements associated with a plurality of UEs and determine a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements. In such scenarios, the one or more RS measurement types fused for a given UE may be based on whether the given UE is an indoor UE or an outdoor UE. Fusion of RS measurement types may allow the positioning engine to exclude certain RS measurement types that may not add to the accuracy of a positioning estimate for the target UE. For example, fusing AoA measurements as part of the position determination may provide significant gains for indoor UEs, while there may be a marginal improvement for fusing AoA measurements associated with outdoor UEs. As such, the selected fusion of different measurement types may reduce the computational burden associated with RS measurements provided by outdoor UEs.

[0141] The position estimates disclosed herein may be obtained through different positioning modes. In a UE-assisted mode, the UE may provide RS measurements to a network server (e.g., location server, LMF, etc.) for computation of a position estimate by the network server. In this mode, the network server may provide assistance data to the UE to configure the UE for the RS measurements. In a UE-based mode, the UE may both obtain the RS measurements and compute the corresponding position estimate based on the RS measurements. Assistance data for one or both of these functions may be provided to the UE by a network server. In a network-based mode, a serving base station of a Public Land Mobile Network (PLMN) may obtain RS measurements of signals transmitted by a UE and compute the position estimate. The transmission of the UE’s signals for network- based mode may or may not be transparent to the UE.

[0142] In accordance with various aspects of the disclosure, whether the UE is an indoor or outdoor UE may be used to determine how the RS measurements associated with the UE are used in determining the position estimate for a target UE. In an aspect, the classification of a UE as an indoor versus an outdoor UE can be used to apply specific techniques in the positioning engine. QC2208730WOQualcomm Ref. No.2208730WO

[0143] The classification of a UE as an indoor or outdoor UE may be undertaken in various manners. In an aspect, the characteristics of the UE may be gathered for the indoor / outdoor classification. In a UE-based approach, the UE may classify itself as an indoor / outdoor on its own (e.g., execute a “hard” decision at the UE based on the gathered characteristics). In an aspect, the UE may use the visual information obtained from a camera or other image sensor to extract features of the UE’s environment and determine whether the UE is inside a building or outside. Some features that may be used in this determination include ambient light conditions, edge detection of objects within the field of view of the UE, depth information associated with the visual information, etc. A UE may employ machine learning techniques to extract such features from the visual information and / or visual channel estimate. Additionally, or in the alternative, the UE may obtain sensor information (e.g., speed, direction, etc.) and / or RF sensing measurements (e.g., using WiFi, UWB, etc.) from which the indoor / outdoor classification may be determined.

[0144] Additionally, or in the alternative, a UE may output a soft decision indicating a probability that the UE is indoors and / or outdoors. In certain scenarios, a threshold may be applied to the effective probability (calculated across time, across different estimates, etc.) to determine whether it is indoors or outdoors. According to aspects of the disclosure, the UE may use and optimize its own positioning engine on the basis of this classification. Additionally, or in the alternative, the UE may provide the classification to a network device and / or target UE.

[0145] The characteristics of a UE may be gathered for the indoor / outdoor determination and used in a network-based approach to UE classification. To this end, a network server (e.g., location server, LMF, etc.) may classify a UE based on characteristics (e.g., characteristics such as all or a subset of those used by a UE in self-classification scenarios) reported to the network server by the UE. In certain scenarios, the classification may be assigned to a UE by the network server as opposed to being assigned based on a self- classification provided by the UE.

[0146] FIG.7 depicts a message flow 700 between a network server 702 and a UE 704 during a network-based indoor / outdoor classification of the UE 704, according to aspects of the disclosure. At operation 706, the network server 702 and UE 704 engage in a configuration set up exchange. At operation 708, the UE 704 provides its capability information. If the indoor / outdoor classification is to be based, at least in part, on visual- QC2208730WOQualcomm Ref. No.2208730WO based information, the UE may consent, at operation 708, to the use of the visual-based information by the network server 702. At operation 710, the UE provides information to network server 702 for the classification determination. In this example, the UE provides visual-based information as well as sensor information from the UE’s inertial measurement unit (IMU). The network server 702 classifies the UE as an indoor / outdoor UE based on the characteristic information reported at operation 710. The network server’s classification of the UE may be used locally at the network server 702 to optimize positioning estimations for target UEs made by the network server 702. Additionally, or in the alternative, the network server 702 may provide the classification to the UE at operation 712 in the form a classification flag (e.g., in the case of a hard decision) or as a probability (e.g., in the case of a soft decision).

[0147] FIG.8 depicts a message flow 800 between a network server 802 and a UE 804 during a network-based indoor / outdoor classification of the UE 804, according to aspects of the disclosure. At operation 806, the network server 802 and UE 804 engage in a configuration set up exchange. At operation 808, the UE 804 provides its capability information. If the indoor / outdoor classification is to be based, at least in part, on visual- based information, the UE may consent, at operation 808, to the use of the visual-based information by the network server 802. At operation 810, the UE communicates with devices (e.g., devices integrated with the UE and / or separate from the UE) employing other positioning technologies 812 and provides measurements (e.g., signal measurements and / or position estimates obtained using the other positioning technologies) to the network server 802 at operation 814 for the classification determination. The network server 802 classifies the UE as an indoor / outdoor UE based on the measurements provided at operation 814 and, if available, characteristic information (e.g., visual information) reported by the UE 804. The network server’s classification of the UE may be used locally at the network server 802 to optimize positioning estimations for target UEs made by the network server 802. Additionally, or in the alternative, the network server 802 may provide the classification to the UE at operation 816 in the form a classification flag (e.g., in the case of a hard decision) or as a probability (e.g., in the case of a soft decision).

[0148] In accordance with certain aspects of the disclosure, the classification of a UE as an indoor UE or outdoor UE may be based on crowdsourcing UE characteristics at a network server (e.g., a private server). To this end, the UEs may provide information relevant to its QC2208730WOQualcomm Ref. No.2208730WO classification to a remote server, which can be a private server or a Connected Intelligent Edge (CIE) server or the like. UEs may report their characteristics to the network server, along with some measurements that may be used to deduce such characteristics. For instance, a UE may provide camera measurements to the network server and indicate that it is an indoor UE. Additionally, or in the alternative, a UE may provide a channel estimate to the server, which the network server / CIE uses to classify the UE as indoor / outdoor.

[0149] Using a database based on crowdsourcing, the server / CIE may, in turn, classify newer UEs and assist them in various manners. In a UE-based positioning mode, the UE may request its characteristics from the network server / CIE and optimize its own positioning engine accordingly. In a network-based positioning mode, the UE may request the position estimate directly from the server / CIE, which optimizes the position estimate based on applying a bias correction factor to the RS measurements associated with the indoor UEs.

[0150] The foregoing methods may be region-specific (e.g., geographically specific, locality specific, etc.) To this end, each region may be associated with its own classification technique. In certain scenarios, the classification technique may take a coarse location as an input (such as serving cell location) and apply the appropriate classification technique to the UEs within the coarse location.

[0151] In view of the foregoing, the classification as to which UEs are indoor UEs may be obtained in various manners. The various manners of obtaining such classifications may include 1) receiving, from the plurality of UEs, a classification indicating that one or more of the plurality of UEs is an indoor UE, 2) receiving, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE, 3) receiving, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE, 4) receiving, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE, 5) receiving, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE, or 6) any combination thereof.

[0152] Although the foregoing classification techniques are discussed in the context of determining whether a UE is an indoor UE or an outdoor UE, it will be recognized, based on the teachings of the present disclosure, that default classifications may be assigned to QC2208730WOQualcomm Ref. No.2208730WO a UE and used in the classification process. To this end, a default classification that a UE is an outdoor UE may be used, in which case the classification technique needs only determine whether a UE is an indoor UE. Similarly, a default classification that a UE that an indoor UE limits the classification technique to determining whether a UE is an outdoor UE. Applying default classifications to the UEs may assist in reducing the processing load associated with the indoor / outdoor UE classification operations.

[0153] Certain aspects of the disclosure are implemented with an understanding that large-scale statistics of RS measurements over various UEs in a given region can help identify a bias with respect to the RS measurements (e.g., RTT measurements). In certain scenarios, this bias may be a result of RS measurement errors introduced by the larger number of obstructions, larger number of non-line-of-sight paths, and / or number of reflective surfaces present in an indoor environment when compared to an outdoor environment. Therefore, a bias correction factor corresponding to the amount of bias may be applied to the RS measurements to remove the bias and improve the overall position estimation performance. The units of the bias may be determined based on the type of RS measurement that is to be corrected. For example, if there is a bias associated with an RTT measurement, the bias correction factor may be expressed as a time correction to the RTT measurement. If there is a bias associated with an RS measurement used to obtain a distance measurement, the bias correction factor may be expressed as a distance correction to the distance measurement.

[0154] However, certain aspects of the disclosure are implemented with the recognition that a positioning estimation based on applying the same bias correction factor to RS measurements from a combination of indoor and outdoor UEs may not necessarily properly correct the bias in an optimal manner. This is due to the fact that the overall bias that is computed for the combined indoor and outdoor UEs can vary largely from the bias that is separately computed for the indoor and outdoor UEs alone. This impacts the performance gain that is typically obtained from applying bias correction. As such, if it is known that a UE is either indoor or outdoor, different bias correction factors may be applied to indoor UEs versus outdoor UEs in a manner that boosts positioning performance.

[0155] According to aspects of the disclosure, determining the position estimate for a target UE is based on applying at least one bias correction factor to the RS measurements associated with the indoor UEs used in obtaining the positioning estimate. In a positioning QC2208730WOQualcomm Ref. No.2208730WO environment including both indoor and outdoor UEs, the bias correction factor may be limited to use with RS measurements of the indoor UEs since such measurements often involve environmental conditions (e.g., NLoS conditions, etc.) that impact RS measurements from indoor UEs but remain innocuous to outdoor UEs. In certain positioning scenarios involving both indoor and outdoor UEs, there may not necessarily be a need to apply bias correction factors to RS measurements associated with outdoor UEs. However, in other positioning scenarios involving both indoor and outdoor UEs, a further bias correction factor may be applied to RS measurements associated with outdoor UEs that differs from the bias correction factor applied to indoor UEs.

[0156] A probabilistic approach may be taken with respect to the application of bias correction factors based on the probability of the UE being an indoor UE versus an outdoor UE. To this end, the indoor / outdoor probability may be used to determine the bias correction factor that is to be applied to RS measurements from a given UE. For instance, the bias correction factor applied to a UE may be determined in the following manner: Computed Bias Factor = Indoor probability * Indoor bias factor + (1 - Indoor Probability) * Outdoor bias factor.

[0157] Various types of measurements (e.g., RTT, AoA, etc.) may be combined to derive a position estimate (see, e.g., FIG.6). When different types of measurements are used, the different types of measurements are considered “fused” for the purpose of determining the position estimate. Additionally, when position measurements from different technology types are combined to determine the position estimate, the position measurements from the different technology types are considered “fused” for the purpose of determining the position estimate. Certain aspects of the disclosure are implemented with an understanding that fusing all types of RS measurements from the UEs in a combined indoor / outdoor positioning environment may not provide significant gains in positioning estimate determinations. In accordance with aspects of the disclosure, the set of measurement types that are fused for indoor UEs may be different than the set of measurement types fused for outdoor UEs. For instance, indoor UEs are typically associated with lower signal-to-noise ratios (SNR) due to penetration loss or higher multipath, which in turn, reduces the usefulness of RTT measurements. However, in such scenarios, the AoA measurements provided by the indoor UEs are indeed useful. As such, for indoor UEs, RS measurements for AoA may be used alone or fused with one or more other types of RS measurements while eliminating (or at least reducing) the use of RTT QC2208730WOQualcomm Ref. No.2208730WO measurements that may be provided by the indoor UEs. In the case of outdoor UEs, the fusion of RTT measurements with AoA measurements provides marginal or no position estimate performance gains. Accordingly, for outdoor UEs, RS measurements for RTT may be used alone or fused with one or more other types of RS measurements while eliminating (or at least reducing) the use of AoA measurements that may be provided by the outdoor UEs.

[0158] Overall, on the basis of indoor / outdoor classification of the UEs, certain types of RS measurements may be included or excluded from the computations in the positioning engine. In this manner, the computational burden associated with providing the position estimate can be reduced, thereby conserving power and reducing latency.

[0159] A probabilistic approach to determining the types of RS measurements and their relative weights in the fusion operations may be taken as well. For example, the indoor / outdoor probability may be included as part of the weights assigned to the different types of RS measurements that are fused in determining the position estimates. One such probabilistic approach may be expressed in the following manner: Computed Fusion Factors = AoA weight factor * AoA measurement + RTT weight factor * RTT measurement where AoA weight factor and RTT weight factor are based on a probability that the UE can be classified as an indoor UE.

[0160] The foregoing equation is just an example of a soft / probabilistic approach to fusion operations. In an aspect, the “Computed Fusion Factors” may be a part of an optimization cost / objective function that is in turn used as part of the position estimation computations^

[0161] In accordance with certain aspects of the disclosure, the types of RS measurements that are fused may be combined with measurements obtained using one or more different positioning technologies. Such positioning technologies may include 1) radio frequency fingerprint positioning, 2) global navigation satellite system technology, 3) one or more sensors associated with the plurality of UEs, 4) ultra-wideband positioning, 5) Bluetooth positioning, 6) Wi-Fi positioning, 7) enhanced cell identifier positioning, 8) wide area network positioning, 9) local area network positioning, or 10) any combination thereof.

[0162] FIG. 9 is an example method 900 of wireless communication performed by a network node, according to aspects of the disclosure. At operation 902, the network node obtains RS measurements associated with a plurality of UEs that may comprise a mixture of QC2208730WOQualcomm Ref. No.2208730WO indoor and outdoor UEs. In an aspect, operation 902 may be performed by the one or more WWAN transceivers 310, the one or more processors 332, memory 340, and / or positioning component 342, any or all of which may be considered means for performing this operation. In an aspect, operation 902 may be performed by the one or more WWAN transceivers 350, the one or more processors 384, memory 386, and / or positioning component 388, any or all of which may be considered means for performing this operation. In an aspect, operation 902 may be performed by the one or more network transceivers 390, the one or more processors 394, memory 396, and / or positioning component 398, any or all of which may be considered means for performing this operation.

[0163] At operation 904, the network node determines a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs. In an aspect, operation 904 may be performed by the one or more WWAN transceivers 310, the one or more processors 332, memory 340, and / or positioning component 342, any or all of which may be considered means for performing this operation. In an aspect, operation 904 may be performed by the one or more WWAN transceivers 350, the one or more processors 384, memory 386, and / or positioning component 388, any or all of which may be considered means for performing this operation. In an aspect, operation 904 may be performed by the one or more network transceivers 390, the one or more processors 394, memory 396, and / or positioning component 398, any or all of which may be considered means for performing this operation.

[0164] In some aspects, the network node comprises a location server, a UE, or a base station. In some aspects, the at least one bias correction factor corresponds to an amount of positioning bias introduced by environmental factors associated with an indoor environment of the one or more indoor UEs. In some aspects, a bias correction factor is only applied to RS measurements associated with indoor UEs in determining the position estimate for the target UE. In some aspects, the method includes determining the position estimate for the target UE based on applying at least one further bias correction factor to the RS measurements associated with one or more outdoor UEs of the plurality of UEs. In some aspects, one or more of the plurality of UEs is an anchor UE. In some aspects, one or more of the plurality of UEs is a mobile UE. In some aspects, the at least one bias QC2208730WOQualcomm Ref. No.2208730WO correction factor is based on a probability that a UE is an indoor UE. In some aspects, the RS measurements associated with the one or more indoor UEs include round trip time (RTT) measurements; and the at least one bias correction factor is applied to the RTT measurements. In some aspects, the method includes determining which UEs of the plurality of UEs are indoor UEs. In some aspects, determining which UEs of the plurality of UEs are indoor UEs comprises: receiving, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receiving, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0165] A technical advantage of the method 900 includes the application of bias correction factors to RS measurements associated with indoor UEs to correct for the bias associated with the indoor UEs in a positioning environment. The accuracy of a position estimate for a target UE is boosted by the selective application of the bias correction factors to indoor UEs versus outdoor UEs in a mixture of indoor and outdoor UEs.

[0166] FIG.10 is an example method 1000 of wireless communication performed by a network node, according to aspects of the disclosure. At operation 1002, the network node obtains RS measurements associated with a plurality of UEs. In an aspect, operation 1002 may be performed by the one or more WWAN transceivers 310, the one or more processors 332, memory 340, and / or positioning component 342, any or all of which may be considered means for performing this operation. In an aspect, operation 1002 may be performed by the one or more WWAN transceivers 350, the one or more processors 384, memory 386, and / or positioning component 388, any or all of which may be considered means for performing this operation. In an aspect, operation 1002 may be performed by the one or more network transceivers 390, the one or more processors 394, memory 396, and / or positioning component 398, any or all of which may be considered means for performing this operation.

[0167] At operation 1004, the network node determines a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements QC2208730WOQualcomm Ref. No.2208730WO associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE. In an aspect, operation 1004 may be performed by the one or more WWAN transceivers 310, the one or more processors 332, memory 340, and / or positioning component 342, any or all of which may be considered means for performing this operation. In an aspect, operation 1004 may be performed by the one or more WWAN transceivers 350, the one or more processors 384, memory 386, and / or positioning component 388, any or all of which may be considered means for performing this operation. In an aspect, operation 1004 may be performed by the one or more network transceivers 390, the one or more processors 394, memory 396, and / or positioning component 398, any or all of which may be considered means for performing this operation.

[0168] In some aspects, determining the position estimate for the target UE is further based on fusing the one or more RS measurement types with positioning measurements associated with one or more different positioning technologies. In some aspects, the one or more different positioning technologies comprise: radio frequency fingerprint positioning; global navigation satellite system technology; one or more sensors associated with the plurality of UEs; ultra-wideband positioning; Bluetooth positioning; Wi-Fi positioning; enhanced cell identifier positioning; wide area network positioning; local area network positioning; or any combination thereof. In some aspects, the given UE is an indoor UE; and the one or more RS measurement types fused from the given UE includes one or more angle-of-arrival (AoA) measurements. In some aspects, the given UE is an indoor UE; and the one or more RS measurement types fused from the given UE excludes round-trip time (RTT) measurements. In some aspects, determining the position estimate for the target UE further comprises: weighting the RS measurements of the given UE based on the RS measurement type fused for the given UE. In some aspects, the network node is a location server, a UE, or a base station.. In some aspects, the method includes determining which UEs of the plurality of UEs are indoor UEs. In some aspects, determining which UEs of the plurality of UEs are indoor UEs comprises: receiving, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality QC2208730WOQualcomm Ref. No.2208730WO of UEs is in indoor UE; receiving, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0169] A technical advantage of the method 1000 includes the fusion of different types of RS measurements for indoor UEs versus outdoor UEs to enhance, reduce, or eliminate the impact of the different types of RS measurements in a positioning estimate based on the classification of the UEs. The accuracy of a position estimate for a target UE is boosted by the selective fusion of the different types of RS measurements for indoor UEs versus outdoor UEs. Additionally, the computational load and latency associated with determining a position estimate when using different sets of RS measurement types for indoor UEs versus outdoor UEs may be reduced. Further, the UE may consume less power using the method.

[0170] As will be appreciated, a technical advantage of the methods described herein is that the identification of technologies that provide lower quality positioning information, and the elimination of the lower quality positioning information from position estimation calculations, can improve the accuracy of the position estimation. Another technical advantage is that technologies that produce the lower quality positioning information may be de-emphasized, e.g., by reducing the frequency with which outlier rejection / inlier detection procedures are performed, or reducing the influence that the positioning information associated with those technologies have on the overall position estimation calculations. Yet another technical advantage is that the feedback can help reduce the computation burden, e.g., when a subset of the anchors is always preferred over the other anchors, which can save power and reduce latency.

[0171] 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 QC2208730WOQualcomm Ref. No.2208730WO 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 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.

[0172] Implementation examples are described in the following numbered clauses:

[0173] Clause 1. A method of wireless communication performed by a network node, comprising: obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determining a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

[0174] Clause 2. The method of clause 1, wherein: the at least one bias correction factor corresponds to an amount of positioning bias introduced by environmental factors associated with an indoor environment of the one or more indoor UEs.

[0175] Clause 3. The method of any of clauses 1 to 2, wherein: the target UE is an indoor UE.

[0176] Clause 4. The method of any of clauses 1 to 3, wherein: one or more of the plurality of UEs is an outdoor UE.

[0177] Clause 5. The method of clause 4, wherein: the at least one bias correction factor is only applied to RS measurements associated with the one or more indoor UEs in determining the position estimate for the target UE.

[0178] Clause 6. The method of any of clauses 4 to 5, further comprising: determining the position estimate for the target UE based on applying at least one further bias correction factor to the RS measurements associated with one or more outdoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more outdoor UEs.

[0179] Clause 7. The method of any of clauses 1 to 6, wherein the network node comprises: a location server; a UE; or a base station.

[0180] Clause 8. The method of any of clauses 1 to 7, wherein: the at least one bias correction factor is based on a probability that a UE of the plurality of UEs is an indoor UE. QC2208730WOQualcomm Ref. No.2208730WO

[0181] Clause 9. The method of any of clauses 1 to 8, wherein: the RS measurements associated with the one or more indoor UEs include round trip time (RTT) measurements; and the at least one bias correction factor is applied to the RTT measurements.

[0182] Clause 10. The method of any of clauses 1 to 9, further comprising: determining which UEs of the plurality of UEs are indoor UEs.

[0183] Clause 11. The method of clause 10, wherein determining which UEs of the plurality of UEs are indoor UEs comprises: receiving, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receiving, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0184] Clause 12. A method of wireless communication performed by a network node, comprising: obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determining a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

[0185] Clause 13. The method of clause 12, wherein the one or more different RS measurement types of RS measurements are associated with one or more different positioning technologies.

[0186] Clause 14. The method of clause 13, wherein the one or more different positioning technologies comprise: radio frequency fingerprint positioning; global navigation satellite system technology; one or more sensors associated with the plurality of UEs; ultra- wideband positioning; Bluetooth positioning; Wi-Fi positioning; enhanced cell identifier positioning; wide area network positioning; local area network positioning; or any combination thereof. QC2208730WOQualcomm Ref. No.2208730WO

[0187] Clause 15. The method of any of clauses 12 to 14, wherein: the given UE is an indoor UE; and for the given UE, the one or more different RS measurement types of RS measurements for fusion includes one or more angle-of-arrival (AoA) measurements.

[0188] Clause 16. The method of any of clauses 12 to 15, wherein: the given UE is an indoor UE; and for the given UE, the one or more RS measurement types of RS measurements for fusion excludes round-trip time (RTT) measurements.

[0189] Clause 17. The method of any of clauses 12 to 16, wherein determining the position estimate for the target UE further comprises: weighting the RS measurements of the given UE for fusion based on the RS measurement type of the one or more different RS measurement types.

[0190] Clause 18. The method of any of clauses 12 to 17, wherein the network node comprises: a location server; a UE; or a base station.

[0191] Clause 19. The method of any of clauses 12 to 18, further comprising: determining which UEs of the plurality of UEs are indoor UEs.

[0192] Clause 20. The method of clause 19, wherein determining which UEs of the plurality of UEs are indoor UEs comprises: receiving, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receiving, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0193] Clause 21. A network node, comprising: a memory; at least one transceiver; and at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs. QC2208730WOQualcomm Ref. No.2208730WO

[0194] Clause 22. The network node of clause 21, wherein: the at least one bias correction factor corresponds to an amount of positioning bias introduced by environmental factors associated with an indoor environment of the one or more indoor UEs.

[0195] Clause 23. The network node of any of clauses 21 to 22, wherein: the target UE is an indoor UE.

[0196] Clause 24. The network node of any of clauses 21 to 23, wherein: one or more of the plurality of UEs is an outdoor UE.

[0197] Clause 25. The network node of clause 24, wherein: the at least one bias correction factor is only applied to RS measurements associated with the one or more indoor UEs in determining the position estimate for the target UE.

[0198] Clause 26. The network node of any of clauses 24 to 25, wherein the at least one processor is further configured to: determine the position estimate for the target UE based on applying at least one further bias correction factor to the RS measurements associated with one or more outdoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more outdoor UEs.

[0199] Clause 27. The network node of any of clauses 21 to 26, wherein the network node comprises: a location server; a UE; or a base station.

[0200] Clause 28. The network node of any of clauses 21 to 27, wherein: the at least one bias correction factor is based on a probability that a UE of the plurality of UEs is an indoor UE.

[0201] Clause 29. The network node of any of clauses 21 to 28, wherein: the RS measurements associated with the one or more indoor UEs include round trip time (RTT) measurements; and the at least one bias correction factor is applied to the RTT measurements.

[0202] Clause 30. The network node of any of clauses 21 to 29, wherein the at least one processor is further configured to: determine which UEs of the plurality of UEs are indoor UEs.

[0203] Clause 31. The network node of clause 30, wherein the at least one processor configured to determine which UEs of the plurality of UEs are indoor UEs comprises the at least one processor configured to: receive, via the at least one transceiver,, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver,, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver,, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receive, via the QC2208730WOQualcomm Ref. No.2208730WO at least one transceiver,, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver,, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0204] Clause 32. A network node, comprising: a memory; at least one transceiver; and at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

[0205] Clause 33. The network node of clause 32, wherein the one or more different RS measurement types of RS measurements are associated with one or more different positioning technologies.

[0206] Clause 34. The network node of clause 33, wherein the one or more different positioning technologies comprise: radio frequency fingerprint positioning; global navigation satellite system technology; one or more sensors associated with the plurality of UEs; ultra- wideband positioning; Bluetooth positioning; Wi-Fi positioning; enhanced cell identifier positioning; wide area network positioning; local area network positioning; or any combination thereof.

[0207] Clause 35. The network node of any of clauses 32 to 34, wherein: the given UE is an indoor UE; and for the given UE, the one or more different RS measurement types of RS measurements for fusion includes one or more angle-of-arrival (AoA) measurements.

[0208] Clause 36. The network node of any of clauses 32 to 35, wherein: the given UE is an indoor UE; and for the given UE, the one or more RS measurement types of RS measurements for fusion excludes round-trip time (RTT) measurements.

[0209] Clause 37. The network node of any of clauses 32 to 36, wherein the at least one processor configured to determine the position estimate for the target UE comprises the at least one processor configured to: weight the RS measurements of the given UE for fusion based on the RS measurement type of the one or more different RS measurement types.

[0210] Clause 38. The network node of any of clauses 32 to 37, wherein the network node comprises: a location server; a UE; or a base station. QC2208730WOQualcomm Ref. No.2208730WO

[0211] Clause 39. The network node of any of clauses 32 to 38, wherein the at least one processor is further configured to: determine which UEs of the plurality of UEs are indoor UEs.

[0212] Clause 40. The network node of clause 39, wherein the at least one processor configured to determine which UEs of the plurality of UEs are indoor UEs comprises the at least one processor configured to: receive, via the at least one transceiver,, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver,, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver,, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receive, via the at least one transceiver,, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver,, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0213] Clause 41. A network node, comprising: means for obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and means for determining a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

[0214] Clause 42. The network node of clause 41, wherein: the at least one bias correction factor corresponds to an amount of positioning bias introduced by environmental factors associated with an indoor environment of the one or more indoor UEs.

[0215] Clause 43. The network node of any of clauses 41 to 42, wherein: the target UE is an indoor UE.

[0216] Clause 44. The network node of any of clauses 41 to 43, wherein: one or more of the plurality of UEs is an outdoor UE.

[0217] Clause 45. The network node of clause 44, wherein: the at least one bias correction factor is only applied to RS measurements associated with the one or more indoor UEs in determining the position estimate for the target UE.

[0218] Clause 46. The network node of any of clauses 44 to 45, further comprising: means for determining the position estimate for the target UE based on applying at least one further bias correction factor to the RS measurements associated with one or more outdoor UEs QC2208730WOQualcomm Ref. No.2208730WO of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more outdoor UEs.

[0219] Clause 47. The network node of any of clauses 41 to 46, wherein the network node comprises: a location server; a UE; or a base station.

[0220] Clause 48. The network node of any of clauses 41 to 47, wherein: the at least one bias correction factor is based on a probability that a UE of the plurality of UEs is an indoor UE.

[0221] Clause 49. The network node of any of clauses 41 to 48, wherein: the RS measurements associated with the one or more indoor UEs include round trip time (RTT) measurements; and the at least one bias correction factor is applied to the RTT measurements.

[0222] Clause 50. The network node of any of clauses 41 to 49, further comprising: means for determining which UEs of the plurality of UEs are indoor UEs.

[0223] Clause 51. The network node of clause 50, wherein the means for determining which UEs of the plurality of UEs are indoor UEs comprises: means for receiving, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; means for receiving, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; means for receiving, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; means for receiving, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; means for receiving, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0224] Clause 52. A network node, comprising: means for obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and means for determining a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

[0225] Clause 53. The network node of clause 52, wherein the one or more different RS measurement types of RS measurements are associated with one or more different positioning technologies.

[0226] Clause 54. The network node of clause 53, wherein the one or more different positioning technologies comprise: radio frequency fingerprint positioning; global navigation satellite QC2208730WOQualcomm Ref. No.2208730WO system technology; one or more sensors associated with the plurality of UEs; ultra- wideband positioning; Bluetooth positioning; Wi-Fi positioning; enhanced cell identifier positioning; wide area network positioning; local area network positioning; or any combination thereof.

[0227] Clause 55. The network node of any of clauses 52 to 54, wherein: the given UE is an indoor UE; and for the given UE, the one or more different RS measurement types of RS measurements for fusion includes one or more angle-of-arrival (AoA) measurements.

[0228] Clause 56. The network node of any of clauses 52 to 55, wherein: the given UE is an indoor UE; and for the given UE, the one or more RS measurement types of RS measurements for fusion excludes round-trip time (RTT) measurements.

[0229] Clause 57. The network node of any of clauses 52 to 56, wherein the means for determining the position estimate for the target UE further comprises: means for weighting the RS measurements of the given UE for fusion based on the RS measurement type of the one or more different RS measurement types.

[0230] Clause 58. The network node of any of clauses 52 to 57, wherein the network node comprises: a location server; a UE; or a base station.

[0231] Clause 59. The network node of any of clauses 52 to 58, further comprising: means for determining which UEs of the plurality of UEs are indoor UEs.

[0232] Clause 60. The network node of clause 59, wherein the means for determining which UEs of the plurality of UEs are indoor UEs comprises: means for receiving, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; means for receiving, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; means for receiving, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; means for receiving, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; means for receiving, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0233] Clause 61. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a network node, cause the network node to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated QC2208730WOQualcomm Ref. No.2208730WO with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

[0234] Clause 62. The non-transitory computer-readable medium of clause 61, wherein: the at least one bias correction factor corresponds to an amount of positioning bias introduced by environmental factors associated with an indoor environment of the one or more indoor UEs.

[0235] Clause 63. The non-transitory computer-readable medium of any of clauses 61 to 62, wherein: the target UE is an indoor UE.

[0236] Clause 64. The non-transitory computer-readable medium of any of clauses 61 to 63, wherein: one or more of the plurality of UEs is an outdoor UE.

[0237] Clause 65. The non-transitory computer-readable medium of clause 64, wherein: the at least one bias correction factor is only applied to RS measurements associated with the one or more indoor UEs in determining the position estimate for the target UE.

[0238] Clause 66. The non-transitory computer-readable medium of any of clauses 64 to 65, further comprising computer-executable instructions that, when executed by the network node, cause the network node to: determine the position estimate for the target UE based on applying at least one further bias correction factor to the RS measurements associated with one or more outdoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more outdoor UEs.

[0239] Clause 67. The non-transitory computer-readable medium of any of clauses 61 to 66, wherein the network node comprises: a location server; a UE; or a base station.

[0240] Clause 68. The non-transitory computer-readable medium of any of clauses 61 to 67, wherein: the at least one bias correction factor is based on a probability that a UE of the plurality of UEs is an indoor UE.

[0241] Clause 69. The non-transitory computer-readable medium of any of clauses 61 to 68, wherein: the RS measurements associated with the one or more indoor UEs include round trip time (RTT) measurements; and the at least one bias correction factor is applied to the RTT measurements.

[0242] Clause 70. The non-transitory computer-readable medium of any of clauses 61 to 69, further comprising computer-executable instructions that, when executed by the network node, cause the network node to: determine which UEs of the plurality of UEs are indoor UEs. QC2208730WOQualcomm Ref. No.2208730WO

[0243] Clause 71. The non-transitory computer-readable medium of clause 70, wherein the computer-executable instructions that, when executed by the network node, cause the network node to determine which UEs of the plurality of UEs are indoor UEs comprise computer-executable instructions that, when executed by the network node, cause the network node to: receive, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receive, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receive, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0244] Clause 72. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a network node, cause the network node to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

[0245] Clause 73. The non-transitory computer-readable medium of clause 72, wherein the one or more different RS measurement types of RS measurements are associated with one or more different positioning technologies.

[0246] Clause 74. The non-transitory computer-readable medium of clause 73, wherein the one or more different positioning technologies comprise: radio frequency fingerprint positioning; global navigation satellite system technology; one or more sensors associated with the plurality of UEs; ultra-wideband positioning; Bluetooth positioning; Wi-Fi positioning; enhanced cell identifier positioning; wide area network positioning; local area network positioning; or any combination thereof.

[0247] Clause 75. The non-transitory computer-readable medium of any of clauses 72 to 74, wherein: the given UE is an indoor UE; and for the given UE, the one or more different RS measurement types of RS measurements for fusion includes one or more angle-of- arrival (AoA) measurements. QC2208730WOQualcomm Ref. No.2208730WO

[0248] Clause 76. The non-transitory computer-readable medium of any of clauses 72 to 75, wherein: the given UE is an indoor UE; and for the given UE, the one or more RS measurement types of RS measurements for fusion excludes round-trip time (RTT) measurements.

[0249] Clause 77. The non-transitory computer-readable medium of any of clauses 72 to 76, wherein the computer-executable instructions that, when executed by the network node, cause the network node to determine the position estimate for the target UE comprise computer-executable instructions that, when executed by the network node, cause the network node to: weight the RS measurements of the given UE for fusion based on the RS measurement type of the one or more different RS measurement types.

[0250] Clause 78. The non-transitory computer-readable medium of any of clauses 72 to 77, wherein the network node comprises: a location server; a UE; or a base station.

[0251] Clause 79. The non-transitory computer-readable medium of any of clauses 72 to 78, further comprising computer-executable instructions that, when executed by the network node, cause the network node to: determine which UEs of the plurality of UEs are indoor UEs.

[0252] Clause 80. The non-transitory computer-readable medium of clause 79, wherein the computer-executable instructions that, when executed by the network node, cause the network node to determine which UEs of the plurality of UEs are indoor UEs comprise computer-executable instructions that, when executed by the network node, cause the network node to: receive, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receive, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receive, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

[0253] 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, QC2208730WOQualcomm Ref. No.2208730WO electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0254] 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.

[0255] 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.

[0256] 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 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 QC2208730WOQualcomm Ref. No.2208730WO 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.

[0257] 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.

[0258] 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. The 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. Furthermore, although elements of the disclosure may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated. QC2208730WO

Claims

Qualcomm Ref. No.2208730WO CLAIMS What is claimed is:

1. A method of wireless communication performed by a network node, comprising: obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determining a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

2. The method of claim 1, wherein: the at least one bias correction factor corresponds to an amount of positioning bias introduced by environmental factors associated with an indoor environment of the one or more indoor UEs.

3. The method of claim 1, wherein: the target UE is an indoor UE.

4. The method of claim 1, wherein: one or more of the plurality of UEs is an outdoor UE.

5. The method of claim 4, wherein: the at least one bias correction factor is only applied to RS measurements associated with the one or more indoor UEs in determining the position estimate for the target UE.

6. The method of claim 4, further comprising: determining the position estimate for the target UE based on applying at least one further bias correction factor to the RS measurements associated with one or more outdoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more outdoor UEs. QC2208730WOQualcomm Ref. No.2208730WO 7. The method of claim 1, wherein the network node comprises: a location server; a UE; or a base station.

8. The method of claim 1, wherein: the at least one bias correction factor is based on a probability that a UE of the plurality of UEs is an indoor UE.

9. The method of claim 1, wherein: the RS measurements associated with the one or more indoor UEs include round trip time (RTT) measurements; and the at least one bias correction factor is applied to the RTT measurements.

10. The method of claim 1, further comprising: determining which UEs of the plurality of UEs are indoor UEs.

11. The method of claim 10, wherein determining which UEs of the plurality of UEs are indoor UEs comprises: receiving, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receiving, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

12. A method of wireless communication performed by a network node, comprising: QC2208730WOQualcomm Ref. No.2208730WO obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determining a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

13. The method of claim 12, wherein the one or more different RS measurement types of RS measurements are associated with one or more different positioning technologies.

14. The method of claim 13, wherein the one or more different positioning technologies comprise: radio frequency fingerprint positioning; global navigation satellite system technology; one or more sensors associated with the plurality of UEs; ultra-wideband positioning; Bluetooth positioning; Wi-Fi positioning; enhanced cell identifier positioning; wide area network positioning; local area network positioning; or any combination thereof.

15. The method of claim 12, wherein: the given UE is an indoor UE; and for the given UE, the one or more different RS measurement types of RS measurements for fusion includes one or more angle-of-arrival (AoA) measurements.

16. The method of claim 12, wherein: the given UE is an indoor UE; and for the given UE, the one or more RS measurement types of RS measurements for fusion excludes round-trip time (RTT) measurements. QC2208730WOQualcomm Ref. No.2208730WO 17. The method of claim 12, wherein determining the position estimate for the target UE further comprises: weighting the RS measurements of the given UE for fusion based on the RS measurement type of the one or more different RS measurement types.

18. The method of claim 12, wherein the network node comprises: a location server; a UE; or a base station.

19. The method of claim 12, further comprising: determining which UEs of the plurality of UEs are indoor UEs.

20. The method of claim 19, wherein determining which UEs of the plurality of UEs are indoor UEs comprises: receiving, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receiving, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receiving, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receiving, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

21. A network node, comprising: a memory; at least one transceiver; and at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: QC2208730WOQualcomm Ref. No.2208730WO obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

22. The network node of claim 21, wherein: the at least one bias correction factor corresponds to an amount of positioning bias introduced by environmental factors associated with an indoor environment of the one or more indoor UEs.

23. The network node of claim 21, wherein: the target UE is an indoor UE.

24. The network node of claim 21, wherein: one or more of the plurality of UEs is an outdoor UE.

25. The network node of claim 24, wherein: the at least one bias correction factor is only applied to RS measurements associated with the one or more indoor UEs in determining the position estimate for the target UE.

26. The network node of claim 24, wherein the at least one processor is further configured to: determine the position estimate for the target UE based on applying at least one further bias correction factor to the RS measurements associated with one or more outdoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more outdoor UEs.

27. The network node of claim 21, wherein the network node comprises: a location server; QC2208730WOQualcomm Ref. No.2208730WO a UE; or a base station.

28. The network node of claim 21, wherein: the at least one bias correction factor is based on a probability that a UE of the plurality of UEs is an indoor UE.

29. The network node of claim 21, wherein: the RS measurements associated with the one or more indoor UEs include round trip time (RTT) measurements; and the at least one bias correction factor is applied to the RTT measurements.

30. The network node of claim 21, wherein the at least one processor is further configured to: determine which UEs of the plurality of UEs are indoor UEs.

31. The network node of claim 30, wherein the at least one processor configured to determine which UEs of the plurality of UEs are indoor UEs comprises the at least one processor configured to: receive, via the at least one transceiver, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; receive, via the at least one transceiver, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof. QC2208730WOQualcomm Ref. No.2208730WO 32. A network node, comprising: a memory; at least one transceiver; and at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

33. The network node of claim 32, wherein the one or more different RS measurement types of RS measurements are associated with one or more different positioning technologies.

34. The network node of claim 33, wherein the one or more different positioning technologies comprise: radio frequency fingerprint positioning; global navigation satellite system technology; one or more sensors associated with the plurality of UEs; ultra-wideband positioning; Bluetooth positioning; Wi-Fi positioning; enhanced cell identifier positioning; wide area network positioning; local area network positioning; or any combination thereof.

35. The network node of claim 32, wherein: the given UE is an indoor UE; and QC2208730WOQualcomm Ref. No.2208730WO for the given UE, the one or more different RS measurement types of RS measurements for fusion includes one or more angle-of-arrival (AoA) measurements.

36. The network node of claim 32, wherein: the given UE is an indoor UE; and for the given UE, the one or more RS measurement types of RS measurements for fusion excludes round-trip time (RTT) measurements.

37. The network node of claim 32, wherein the at least one processor configured to determine the position estimate for the target UE comprises the at least one processor configured to: weight the RS measurements of the given UE for fusion based on the RS measurement type of the one or more different RS measurement types.

38. The network node of claim 32, wherein the network node comprises: a location server; a UE; or a base station.

39. The network node of claim 32, wherein the at least one processor is further configured to: determine which UEs of the plurality of UEs are indoor UEs.

40. The network node of claim 39, wherein the at least one processor configured to determine which UEs of the plurality of UEs are indoor UEs comprises the at least one processor configured to: receive, via the at least one transceiver, from the plurality of UEs, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver, from the plurality of UEs, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver, from the plurality of UEs, information that the network node uses to determine that the one or more of the plurality of UEs is in indoor UE; QC2208730WOQualcomm Ref. No.2208730WO receive, via the at least one transceiver, from another network node, a classification indicating that the one or more of the plurality of UEs is an indoor UE; receive, via the at least one transceiver, from another network node, an indication of a probability that the one or more of the plurality of UEs is an indoor UE; or any combination thereof.

41. A network node, comprising: means for obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and means for determining a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs.

42. A network node, comprising: means for obtaining reference signal (RS) measurements associated with a plurality of user equipments (UEs); and means for determining a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE.

43. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a network node, cause the network node to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on the RS measurements, wherein at least one bias correction factor is applied to a subset of the RS measurements associated with one or more indoor UEs of the plurality of UEs to correct for a bias in the RS measurements associated with the one or more indoor UEs. QC2208730WOQualcomm Ref. No.2208730WO 44. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a network node, cause the network node to: obtain reference signal (RS) measurements associated with a plurality of user equipments (UEs); and determine a position estimate for a target UE based on fusing one or more different RS measurement types of the RS measurements associated with the plurality of UEs, wherein, for a given UE among the plurality of UEs, an RS measurement type is fused based on whether the given UE is an indoor UE or an outdoor UE. QC2208730WO

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