Receive-transmit measurement windows and measurement report with multiple downlink positioning reference signal occasion reported per uplink positioning reference signal occasion

Abstract

In an aspect, a user equipment (UE) determines receive-transmit (Rx-Tx) measurement hypotheses between uplink sounding reference signal for positioning (UL- SRS-P) occasion(s) and downlink positioning reference signal (DL-PRS) occasion(s). In an aspect the Rx-Tx measurements are associated with a receive-transmit (Rx-Tx) measurement window. In an aspect, multiple Rx-Tx measurement hypotheses associated with a UL-SRS-P occasion are reported by the UE in a measurement report. In an aspect, a serving wireless network component (e.g., gNB) transmits indication(s) of the Rx-Tx measurement window to other wireless network component(s) (e.g., neighbor gNBs).

Description

Qualcomm Ref. No.2304396WO 1 RECEIVE-TRANSMIT MEASUREMENT WINDOWS AND MEASUREMENT REPORT WITH MULTIPLE DOWNLINK POSITIONING REFERENCE SIGNAL OCCASION REPORTED PER UPLINK POSITIONING REFERENCE SIGNAL OCCASION BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure

[0001] Aspects of the disclosure relate generally to wireless communications. 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. 1 QC2304396WOQualcomm Ref. No.2304396WO 2 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 relating to all contemplated aspects, nor should the following summary be considered to identify key or critical elements relating to all contemplated aspects or to delineate the scope associated with any particular aspect. Accordingly, the following summary has the sole purpose to present certain concepts relating to one or more aspects relating to the mechanisms disclosed herein in a simplified form to precede the detailed description presented below.

[0005] In an aspect, a method of operating a user equipment (UE) includes receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receiving an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL- PRS occasion within the Rx-Tx measurement window; and transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0006] In an aspect, a method of operating a wireless network component includes receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receiving an indication of a receive-transmit (Rx- Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and transmitting one or 2 QC2304396WOQualcomm Ref. No.2304396WO 3 more indications of the Rx-Tx measurement window to one or more neighboring wireless network components.

[0007] In an aspect, a method of operating a position estimation entity includes transmitting an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); transmitting a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; transmitting an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and receiving a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and determining a position estimate of the UE based at least in part on the information.

[0008] In an aspect, a method of operating a user equipment (UE) includes receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL- SRS-P resource configuration, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS occasions ; and transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0009] In an aspect, a user equipment (UE) includes a memory; and at least one processor communicatively coupled to the memory, the at least one processor configured to: receive an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session 3 QC2304396WOQualcomm Ref. No.2304396WO 4 of the UE; receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receive an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL- PRS occasion within the Rx-Tx measurement window; and transmit a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0010] In an aspect, a wireless network component includes a memory; and at least one processor communicatively coupled to the memory, the at least one processor configured to: receive an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receive an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and transmit one or more indications of the Rx-Tx measurement window to one or more neighboring wireless network components.

[0011] In an aspect, a position estimation entity includes a memory; and at least one processor communicatively coupled to the memory, the at least one processor configured to: transmit an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); transmit a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; transmit an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where 4 QC2304396WOQualcomm Ref. No.2304396WO 5 the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and receive a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and determine a position estimate of the UE based at least in part on the information.

[0012] In an aspect, an UE includes a memory; and at least one processor communicatively coupled to the memory, the at least one processor configured to: receive an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS occasions ; and transmit a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0013] In an aspect, a user equipment (UE) includes means for receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; means for receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; means for receiving an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE; for at least one UL- SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and means for transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses. 5 QC2304396WOQualcomm Ref. No.2304396WO 6

[0014] In an aspect, a wireless network component includes means for receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); means for receiving a downlink positioning reference signal (DL- PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; means for receiving an indication of a receive- transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and means for transmitting one or more indications of the Rx-Tx measurement window to one or more neighboring wireless network components.

[0015] In an aspect, a position estimation entity includes means for transmitting an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); means for transmitting a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; means for transmitting an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and means for receiving a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and means for determining a position estimate of the UE based at least in part on the information.

[0016] In an aspect, an UE includes means for receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; means for receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a 6 QC2304396WOQualcomm Ref. No.2304396WO 7 set of DL-PRS occasions associated with the position estimation session of the UE; means for, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS occasions ; and means for transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0017] In an aspect, a non-transitory computer-readable medium storing computer-executable instructions that, when executed by a user equipment (UE), cause the UE to: receive an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receive an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and transmit a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0018] In an aspect, a non-transitory computer-readable medium storing computer-executable instructions that, when executed by a wireless network component, cause the wireless network component to: receive an uplink sounding reference signal for positioning (UL- SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL- PRS occasions associated with the position estimation session of the UE; receive an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS- P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and transmit one or more indications of the Rx-Tx measurement window to one or more neighboring wireless network components. 7 QC2304396WOQualcomm Ref. No.2304396WO 8

[0019] In an aspect, a non-transitory computer-readable medium storing computer-executable instructions that, when executed by a position estimation entity, cause the position estimation entity to: transmit an uplink sounding reference signal for positioning (UL- SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); transmit a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL- PRS occasions associated with the position estimation session of the UE; transmit an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS- P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and receive a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and determine a position estimate of the UE based at least in part on the information.

[0020] In an aspect, a non-transitory computer-readable medium storing computer-executable instructions that, when executed by an UE, cause the UE to: receive an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS occasions ; and transmit a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0021] 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. 8 QC2304396WOQualcomm Ref. No.2304396WO 9 BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] FIG. 1 illustrates an example wireless communications system, according to aspects of the disclosure.

[0024] FIGS.2A, 2B, and 2C illustrate example wireless network structures, according to aspects of the disclosure.

[0025] 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.

[0026] FIG. 4 is a diagram illustrating an example frame structure, according to aspects of the disclosure.

[0027] FIG. 5 is a diagram illustrating various downlink channels within an example downlink slot, according to aspects of the disclosure.

[0028] FIG. 6 is a diagram of an example positioning reference signal (PRS) configuration for the PRS transmissions of a given base station, according to aspects of the disclosure.

[0029] FIG. 7 is a diagram illustrating various uplink channels within an example uplink slot, according to aspects of the disclosure.

[0030] FIG. 8 is a diagram illustrating an example round-trip-time (RTT) procedure for determining a location of a UE, according to aspects of the disclosure.

[0031] FIG. 9 is a diagram showing example timings of RTT measurement signals exchanged between a base station and a UE, according to aspects of the disclosure.

[0032] FIG.10 is a diagram illustrating example timings of RTT measurement signals exchanged between a base station and a UE, according to aspects of the disclosure.

[0033] FIG. 11 illustrates a positioning information exchange procedure, in accordance with aspects of the disclosure.

[0034] FIG.12 illustrates an exemplary process of communications according to an aspect of the disclosure.

[0035] FIG.13 illustrates an exemplary process of communications according to an aspect of the disclosure. 9 QC2304396WOQualcomm Ref. No.2304396WO 10

[0036] FIG.14 illustrates an exemplary process of communications according to an aspect of the disclosure.

[0037] FIG. 15 illustrates an example implementation of the processes of FIGS. 12-14, respectively, in accordance with aspects of the disclosure.

[0038] FIG. 16 illustrates an example implementation of the processes of FIGS. 12-14, respectively, in accordance with aspects of the disclosure.

[0039] FIG. 17 illustrates an example implementation of the processes of FIGS. 12-14, respectively, in accordance with aspects of the disclosure.

[0040] FIG.18 illustrates an exemplary process of communications according to an aspect of the disclosure DETAILED DESCRIPTION

[0041] 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.

[0042] Various aspects relate generally to transmit-receive (Rx-Tx) measurements. In terms of round-trip time (RTT) computation at location management function (LMF), UE reports UE Rx-Tx time difference and time stamp. NG-RAN reports gNB Rx-Tx time difference and time stamp. LMF is aware of the DL subframe boundary differences across NG-RAN nodes. LMF investigates the time stamps and puts together UE and gNB Rx-Tx time difference measurements taken at the closest proximity of time. This framework works well with the current definition of UE and gNB Rx-Tx time difference since the respective Rx-Tx time differences are not coupled together (i.e., UE may receive PRS and measure UE Rx-Tx time difference, and transmits SRS for gNB measurement independently under an implicit assumption that the RTT does not change during this timeline). However, if the UE compensates the UE Rx-Tx time difference so that the UE Rx-Tx time difference is valid for a SRS transmission at a different subframe, the UE has to put the subframe # that carried the SRS. In this case, LMF must put together this UE measurement with corresponding gNB measurement. The UE is free to choose when to measure PRS and which SRS to link to. From the LMF perspective, this is problematic because the network 10 QC2304396WOQualcomm Ref. No.2304396WO 11 (e.g., gNBs) may not be able to measure the particular SRS instance the UE chooses to link for the UE Rx-Tx time difference measurement.

[0043] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. Aspects of the disclosure related to a defined Rx-Tx measurement window for UE Rx-Tx time difference. In an aspect, both the UE and various wireless network component(s) (e.g., gNB(s) or TRP(s), etc.) may be configured with the Rx-Tx measurement window, such that the problem of linking the UE Rx-Tx time difference measurement(s) to SRS is mitigated. In other aspects, a measurement report including measurement hypotheses associated with multiple DL-PRS occasions per UL-SRS-P occasion may be reported (with or without Rx-Tx measurement window), which permits a more flexible coupling (or linking) of the UE Rx-Tx time difference measurement(s) to SRS at a position estimation entity (e.g., LMF for network-assisted position estimation or UE for UE-based position estimation). Such aspects may provide various technical advantages, such as improved position estimation accuracy, reduced position estimation latency, and so on.

[0044] 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.

[0045] Those of skill in the art will appreciate that the information and signals described below may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description below may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof, depending in part on the particular application, in part on the desired design, in part on the corresponding technology, etc.

[0046] 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 11 QC2304396WOQualcomm Ref. No.2304396WO 12 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.

[0047] 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.

[0048] A base station may operate according to one of several RATs in communication with UEs depending on the network in which it is deployed, and may be alternatively referred to as an access point (AP), a network node, a NodeB, an evolved NodeB (eNB), a next generation eNB (ng-eNB), a New Radio (NR) Node B (also referred to as a gNB or gNodeB), etc. A base station may be used primarily to support wireless access by UEs, including supporting data, voice, and / or signaling connections for the supported UEs. In 12 QC2304396WOQualcomm Ref. No.2304396WO 13 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.

[0049] 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.

[0050] In some implementations that support positioning of UEs, a base station may not support wireless access by UEs (e.g., may not support data, voice, and / or signaling connections for UEs), but may instead transmit reference signals to UEs to be measured by the UEs, and / or may receive and measure signals transmitted by the UEs. Such a base station may be referred to as a positioning beacon (e.g., when transmitting signals to UEs) and / or as a location measurement unit (e.g., when receiving and measuring signals from UEs). 13 QC2304396WOQualcomm Ref. No.2304396WO 14

[0051] 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.

[0052] 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.

[0053] The base stations 102 may collectively form a RAN and interface with a core network 170 (e.g., an evolved packet core (EPC) or a 5G core (5GC)) through backhaul links 122, and through the core network 170 to one or more location servers 172 (e.g., a location management function (LMF) or a secure user plane location (SUPL) location platform (SLP)). The location server(s) 172 may be part of core network 170 or may be external to core network 170. A location server 172 may be integrated with a base station 102. A UE 104 may communicate with a location server 172 directly or indirectly. For example, a UE 104 may communicate with a location server 172 via the base station 102 that is currently serving that UE 104. A UE 104 may also communicate with a location server 172 through another path, such as via an application server (not shown), via another network, such as via a wireless local area network (WLAN) access point (AP) (e.g., AP 150 described below), and so on. For signaling purposes, communication between a UE 104 and a location server 172 may be represented as an indirect connection (e.g., through 14 QC2304396WOQualcomm Ref. No.2304396WO 15 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.

[0054] 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.

[0055] 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. 15 QC2304396WOQualcomm Ref. No.2304396WO 16

[0056] 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).

[0057] 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).

[0058] 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.

[0059] 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®. 16 QC2304396WOQualcomm Ref. No.2304396WO 17

[0060] 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.

[0061] 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.

[0062] 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 17 QC2304396WOQualcomm Ref. No.2304396WO 18 antennas of the network node themselves are physically co-located. In NR, there are four types of quasi-co-location (QCL) relations. Specifically, a QCL relation of a given type means that certain parameters about a second reference RF signal on a second beam can be derived from information about a source reference RF signal on a source beam. Thus, if the source reference RF signal is QCL Type A, the receiver can use the source reference RF signal to estimate the Doppler shift, Doppler spread, average delay, and delay spread of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type B, the receiver can use the source reference RF signal to estimate the Doppler shift and Doppler spread of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type C, the receiver can use the source reference RF signal to estimate the Doppler shift and average delay of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type D, the receiver can use the source reference RF signal to estimate the spatial receive parameter of a second reference RF signal transmitted on the same channel.

[0063] 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.

[0064] 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. 18 QC2304396WOQualcomm Ref. No.2304396WO 19

[0065] Note that a “downlink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the downlink beam to transmit a reference signal to a UE, the downlink beam is a transmit beam. If the UE is forming the downlink beam, however, it is a receive beam to receive the downlink reference signal. Similarly, an “uplink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the uplink beam, it is an uplink receive beam, and if a UE is forming the uplink beam, it is an uplink transmit beam.

[0066] 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 TELECOMMUNICATION UNION® as a “millimeter wave” band.

[0067] 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.

[0068] 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 19 QC2304396WOQualcomm Ref. No.2304396WO 20 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.

[0069] 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.

[0070] 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 20 QC2304396WOQualcomm Ref. No.2304396WO 21 theoretically lead to a two-fold increase in data rate (i.e., 40 MHz), compared to that attained by a single 20 MHz carrier.

[0071] The wireless communications system 100 may further include a UE 164 that may communicate with a macro cell base station 102 over a communication link 120 and / or the mmW base station 180 over a mmW communication link 184. For example, the macro cell base station 102 may support a PCell and one or more SCells for the UE 164 and the mmW base station 180 may support one or more SCells for the UE 164.

[0072] 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.

[0073] 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., 21 QC2304396WOQualcomm Ref. No.2304396WO 22 encompassing one or more channels across one or more carriers) associated with wireless communication between one or more transmitter / receiver pairs. In an aspect, the medium of interest may correspond to at least a portion of an unlicensed frequency band shared among various RATs. Although different licensed frequency bands have been reserved for certain communication systems (e.g., by a government entity such as the Federal Communications Commission (FCC) in the United States), these systems, in particular those employing small cell access points, have recently extended operation into unlicensed frequency bands such as the Unlicensed National Information Infrastructure (U-NII) band used by wireless local area network (WLAN) technologies, most notably IEEE 802.11x WLAN technologies generally referred to as “Wi-Fi.” Example systems of this type include different variants of CDMA systems, TDMA systems, FDMA systems, orthogonal FDMA (OFDMA) systems, single-carrier FDMA (SC-FDMA) systems, and so on.

[0074] 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.

[0075] 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 22 QC2304396WOQualcomm Ref. No.2304396WO 23 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.

[0076] In a satellite positioning system, the use of signals 124 can be augmented by various satellite-based augmentation systems (SBAS) that may be associated with or otherwise enabled for use with one or more global and / or regional navigation satellite systems. For example an SBAS may include an augmentation system(s) that provides integrity information, differential corrections, etc., such as the Wide Area Augmentation System (WAAS), the European Geostationary Navigation Overlay Service (EGNOS), the Multi- functional Satellite Augmentation System (MSAS), the Global Positioning System (GPS) Aided Geo Augmented Navigation or GPS and Geo Augmented Navigation system (GAGAN), and / or the like. Thus, as used herein, a satellite positioning system may include any combination of one or more global and / or regional navigation satellites associated with such one or more satellite positioning systems.

[0077] 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.

[0078] The wireless communications system 100 may further include one or more UEs, such as UE 190, that connects indirectly to one or more communication networks via one or more device-to-device (D2D) peer-to-peer (P2P) links (referred to as “sidelinks”). In the example of FIG. 1, UE 190 has a D2D P2P link 192 with one of the UEs 104 connected to one of the base stations 102 (e.g., through which UE 190 may indirectly obtain cellular connectivity) and a D2D P2P link 194 with WLAN STA 152 connected to the WLAN AP 150 (through which UE 190 may indirectly obtain WLAN-based Internet connectivity). In an example, the D2D P2P links 192 and 194 may be supported with any well-known D2D RAT, such as LTE Direct (LTE-D), WI-FI DIRECT®, BLUETOOTH®, and so on. 23 QC2304396WOQualcomm Ref. No.2304396WO 24

[0079] FIG.2A illustrates an example wireless network structure 200. For example, a 5GC 210 (also referred to as a Next Generation Core (NGC)) can be viewed functionally as control plane (C-plane) functions 214 (e.g., UE registration, authentication, network access, gateway selection, etc.) and user plane (U-plane) functions 212, (e.g., UE gateway function, access to data networks, IP routing, etc.) which operate cooperatively to form the core network. User plane interface (NG-U) 213 and control plane interface (NG-C) 215 connect the gNB 222 to the 5GC 210 and specifically to the user plane functions 212 and control plane functions 214, respectively. In an additional configuration, an ng-eNB 224 may also be connected to the 5GC 210 via NG-C 215 to the control plane functions 214 and NG-U 213 to user plane functions 212. Further, ng-eNB 224 may directly communicate with gNB 222 via a backhaul connection 223. In some configurations, a Next Generation RAN (NG-RAN) 220 may have one or more gNBs 222, while other configurations include one or more of both ng-eNBs 224 and gNBs 222. Either (or both) gNB 222 or ng-eNB 224 may communicate with one or more UEs 204 (e.g., any of the UEs described herein).

[0080] 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).

[0081] 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, 24 QC2304396WOQualcomm Ref. No.2304396WO 25 mobility management, lawful interception, transport for session management (SM) messages between one or more UEs 204 (e.g., any of the UEs described herein) and a session management function (SMF) 266, transparent proxy services for routing SM messages, access authentication and access authorization, transport for short message service (SMS) messages between the UE 204 and the short message service function (SMSF) (not shown), and security anchor functionality (SEAF). The AMF 264 also interacts with an authentication server function (AUSF) (not shown) and the UE 204, and receives the intermediate key that was established as a result of the UE 204 authentication process. In the case of authentication based on a UMTS (universal mobile telecommunications system) subscriber identity module (USIM), the AMF 264 retrieves the security material from the AUSF. The functions of the AMF 264 also include security context management (SCM). The SCM receives a key from the SEAF that it uses to derive access-network specific keys. The functionality of the AMF 264 also includes location services management for regulatory services, transport for location services messages between the UE 204 and a location management function (LMF) 270 (which acts as a location server 230), transport for location services messages between the NG-RAN 220 and the LMF 270, evolved packet system (EPS) bearer identifier allocation for interworking with the EPS, and UE 204 mobility event notification. In addition, the AMF 264 also supports functionalities for non-3GPP® (Third Generation Partnership Project) access networks.

[0082] 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. 25 QC2304396WOQualcomm Ref. No.2304396WO 26

[0083] 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.

[0084] Another optional aspect may include an LMF 270, which may be in communication with the 5GC 260 to provide location assistance for UEs 204. The LMF 270 can be implemented as a plurality of separate servers (e.g., physically separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc.), or alternately may each correspond to a single server. The LMF 270 can be configured to support one or more location services for UEs 204 that can connect to the LMF 270 via the core network, 5GC 260, and / or via the Internet (not illustrated). The SLP 272 may support similar functions to the LMF 270, but whereas the LMF 270 may communicate with the AMF 264, NG-RAN 220, and UEs 204 over a control plane (e.g., using interfaces and protocols intended to convey signaling messages and not voice or data), the SLP 272 may communicate with UEs 204 and external clients (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).

[0085] 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.

[0086] 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 26 QC2304396WOQualcomm Ref. No.2304396WO 27 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.

[0087] The functionality of a gNB 222 may be divided between a gNB central unit (gNB-CU) 226, one or more gNB distributed units (gNB-DUs) 228, and one or more gNB radio units (gNB-RUs) 229. A gNB-CU 226 is a logical node that includes the base station functions of transferring user data, mobility control, radio access network sharing, positioning, session management, and the like, except for those functions allocated exclusively to the gNB-DU(s) 228. More specifically, the gNB-CU 226 generally host the radio resource control (RRC), service data adaptation protocol (SDAP), and packet data convergence protocol (PDCP) protocols of the gNB 222. A gNB-DU 228 is a logical node that generally hosts the radio link control (RLC) and medium access control (MAC) layer of the gNB 222. Its operation is controlled by the gNB-CU 226. One gNB-DU 228 can support one or more cells, and one cell is supported by only one gNB-DU 228. The interface 232 between the gNB-CU 226 and the one or more gNB-DUs 228 is referred to 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.

[0088] 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 27 QC2304396WOQualcomm Ref. No.2304396WO 28 base station (also known as a standalone base station or a monolithic base station) or a disaggregated base station.

[0089] 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).

[0090] Base station-type operation or network design may consider aggregation characteristics of base station functionality. For example, disaggregated base stations may be utilized in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (such as the network configuration sponsored by the O-RAN ALLIANCE®)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C- RAN)). Disaggregation may include distributing functionality across two or more units 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.

[0091] FIG. 2C illustrates an example disaggregated base station architecture 250, according to aspects of the disclosure. The disaggregated base station architecture 250 may include one or more central units (CUs) 280 (e.g., gNB-CU 226) that can communicate directly with a core network 267 (e.g., 5GC 210, 5GC 260) via a backhaul link, or indirectly with the core network 267 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 259 via an E2 link, or a Non-Real Time (Non-RT) RIC 257 associated with a Service Management and Orchestration (SMO) Framework 255, or both). A CU 280 may communicate with one or more DUs 285 (e.g., gNB-DUs 228) via respective midhaul links, such as an F1 interface. The DUs 285 may communicate with one or more radio units (RUs) 287 (e.g., 28 QC2304396WOQualcomm Ref. No.2304396WO 29 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.

[0092] Each of the units, i.e., the CUs 280, the DUs 285, the RUs 287, as well as the Near-RT RICs 259, the Non-RT RICs 257 and the SMO Framework 255, may include one or more interfaces or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communication interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or transmit signals over a wired transmission medium to one or more of the other units. Additionally, the units can include a wireless interface, which may include a receiver, a transmitter or transceiver (such as a RF transceiver), configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.

[0093] In some aspects, the CU 280 may host one or more higher layer control functions. Such control functions can include RRC, PDCP, service data adaptation protocol (SDAP), or the like. Each control function can be implemented with an interface configured to 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.

[0094] The DU 285 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 287. In some aspects, the DU 285 may host one or more of a RLC layer, a MAC layer, and one or more high PHY layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, or the like) depending, at least in part, on a functional split, 29 QC2304396WOQualcomm Ref. No.2304396WO 30 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.

[0095] Lower-layer functionality can be implemented by one or more RUs 287. In some deployments, an RU 287, controlled by a DU 285, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like), or both, based at least in part on the functional split, such as a lower layer functional split. In such an architecture, the RU(s) 287 can be implemented to handle over the air (OTA) communication with one or more UEs 204. In some implementations, real-time and non-real-time aspects of control and user plane communication with the RU(s) 287 can be controlled by the corresponding DU 285. In some scenarios, this configuration can enable the DU(s) 285 and the CU 280 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0096] 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 30 QC2304396WOQualcomm Ref. No.2304396WO 31 Framework 255 also may include a Non-RT RIC 257 configured to support functionality of the SMO Framework 255.

[0097] 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.

[0098] In some implementations, to generate AI / ML models to be deployed in the Near-RT RIC 259, the Non-RT RIC 257 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 259 and may be received at the SMO Framework 255 or the Non-RT RIC 257 from non-network data sources or from network functions. In some examples, the Non-RT RIC 257 or the Near-RT RIC 259 may be configured to tune RAN behavior or performance. For 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).

[0099] 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 31 QC2304396WOQualcomm Ref. No.2304396WO 32 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.

[0100] The UE 302 and the base station 304 each include one or more wireless wide area network (WWAN) transceivers 310 and 350, respectively, providing means for communicating (e.g., means for transmitting, means for receiving, means for measuring, means for tuning, means for refraining from transmitting, etc.) via one or more wireless communication networks (not shown), such as an NR network, an LTE network, a GSM network, and / or the like. The WWAN transceivers 310 and 350 may each be connected to one or more antennas 316 and 356, respectively, for communicating with other network nodes, such as other UEs, access points, base stations (e.g., eNBs, gNBs), etc., via at least one designated RAT (e.g., NR, LTE, GSM, etc.) over a wireless communication medium of interest (e.g., some set of time / frequency resources in a particular frequency spectrum). The WWAN transceivers 310 and 350 may be variously configured for transmitting and encoding signals 318 and 358 (e.g., messages, indications, information, and so on), respectively, and, conversely, for receiving and decoding signals 318 and 358 (e.g., 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.

[0101] The UE 302 and the base station 304 each also include, at least in some cases, one or more short-range wireless transceivers 320 and 360, respectively. The short-range wireless transceivers 320 and 360 may be connected to one or more antennas 326 and 366, respectively, and provide means for communicating (e.g., means for transmitting, means for receiving, means for measuring, means for tuning, means for refraining from transmitting, etc.) with other network nodes, such as other UEs, access points, base stations, etc., via at least one designated RAT (e.g., Wi-Fi, LTE Direct, BLUETOOTH®, ZIGBEE®, Z-WAVE®, PC5, dedicated short-range communications (DSRC), wireless access for vehicular environments (WAVE), near-field communication (NFC), ultra- 32 QC2304396WOQualcomm Ref. No.2304396WO 33 wideband (UWB), etc.) over a wireless communication medium of interest. The short- range wireless transceivers 320 and 360 may be variously configured for transmitting and encoding signals 328 and 368 (e.g., messages, indications, information, and so on), respectively, and, conversely, for receiving and decoding signals 328 and 368 (e.g., messages, indications, information, pilots, and so on), respectively, in accordance with the designated RAT. Specifically, the short-range wireless transceivers 320 and 360 include one or more transmitters 324 and 364, respectively, for transmitting and encoding signals 328 and 368, respectively, and one or more receivers 322 and 362, respectively, for receiving and decoding signals 328 and 368, respectively. As specific examples, the short-range wireless transceivers 320 and 360 may be Wi-Fi transceivers, BLUETOOTH® transceivers, ZIGBEE® and / or Z-WAVE® transceivers, NFC transceivers, UWB transceivers, or vehicle-to-vehicle (V2V) and / or vehicle-to- everything (V2X) transceivers.

[0102] 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, 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. 33 QC2304396WOQualcomm Ref. No.2304396WO 34

[0103] 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.

[0104] 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 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. 34 QC2304396WOQualcomm Ref. No.2304396WO 35

[0105] 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.

[0106] 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 gate arrays (FPGAs), other programmable logic devices or processing circuitry, or various combinations thereof.

[0107] 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 Rx-Tx component 342, 388, and 398, respectively. The Rx-Tx 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 35 QC2304396WOQualcomm Ref. No.2304396WO 36 Rx-Tx 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 Rx-Tx 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 Rx-Tx 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 Rx-Tx 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 Rx-Tx 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.

[0108] 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 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.

[0109] 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 36 QC2304396WOQualcomm Ref. No.2304396WO 37 microphone, and so on). Although not shown, the base station 304 and the network entity 306 may also include user interfaces.

[0110] 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.

[0111] The transmitter 354 and the receiver 352 may implement Layer-1 (L1) functionality associated with various signal processing functions. Layer-1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding / decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation / demodulation of physical channels, and MIMO antenna processing. The transmitter 354 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an orthogonal frequency division multiplexing (OFDM) subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and / or frequency domain, and then combined together using an inverse fast Fourier 37 QC2304396WOQualcomm Ref. No.2304396WO 38 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.

[0112] 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. 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.

[0113] 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.

[0114] 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 38 QC2304396WOQualcomm Ref. No.2304396WO 39 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.

[0115] 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.

[0116] 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.

[0117] In the uplink, the one or more processors 384 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 302. IP packets from the one or more processors 384 may be provided to the core network. The one or more processors 384 are also responsible for error detection.

[0118] 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, 39 QC2304396WOQualcomm Ref. No.2304396WO 40 a particular implementation of UE 302 may omit the WWAN transceiver(s) 310 (e.g., a wearable device or tablet computer or personal computer (PC) or laptop may have Wi-Fi and / or BLUETOOTH® capability without cellular capability), or may omit the short- range wireless transceiver(s) 320 (e.g., cellular-only, etc.), or may omit the satellite signal receiver 330, or may omit the sensor(s) 344, and so on. In another example, in case of FIG. 3B, a particular implementation of the base station 304 may omit the WWAN transceiver(s) 350 (e.g., a Wi-Fi “hotspot” access point without cellular capability), or may omit the short-range wireless transceiver(s) 360 (e.g., cellular-only, etc.), or may omit the satellite signal receiver 370, and so on. For brevity, illustration of the various alternative configurations is not provided herein, but would be readily understandable to one skilled in the art.

[0119] 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.

[0120] The components of FIGS.3A, 3B, and 3C may be implemented in various ways. In some implementations, the components of FIGS. 3A, 3B, and 3C may be implemented in one or more circuits such as, for example, one or more processors and / or one or more ASICs (which may include one or more processors). Here, each circuit may use and / or incorporate at least one memory component for storing information or executable code used by the circuit to provide this functionality. For example, some or all of the functionality represented by blocks 310 to 346 may be implemented by processor and memory component(s) of the UE 302 (e.g., by execution of appropriate code and / or by appropriate configuration of processor components). Similarly, some or all of the functionality represented by blocks 350 to 388 may be implemented by processor and memory component(s) of the base station 304 (e.g., by execution of appropriate code and / or by appropriate configuration of processor components). Also, some or all of the functionality represented by blocks 390 to 398 may be implemented by processor and memory component(s) of the network entity 306 (e.g., by execution of appropriate code 40 QC2304396WOQualcomm Ref. No.2304396WO 41 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 Rx-Tx component 342, 388, and 398, etc.

[0121] In some designs, the network entity 306 may be implemented as a core network component. In other designs, the network entity 306 may be distinct from a network operator or operation of the cellular network infrastructure (e.g., NG RAN 220 and / or 5GC 210 / 260). For example, the network entity 306 may be a component of a private network that may be configured to communicate with the UE 302 via the base station 304 or independently from the base station 304 (e.g., over a non-cellular communication link, such as Wi-Fi).

[0122] 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.

[0123] LTE, and in some cases NR, utilizes orthogonal frequency-division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink. Unlike LTE, however, NR has an option to use OFDM on the uplink as well. OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth. For example, the spacing of the subcarriers may be 15 kilohertz (kHz) and the minimum resource allocation (resource block) may be 12 subcarriers (or 180 kHz). Consequently, the nominal fast Fourier transform (FFT) size may be equal to 128, 256, 512, 1024, or 2048 for system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), respectively. The system bandwidth may also be partitioned into subbands. For 41 QC2304396WOQualcomm Ref. No.2304396WO 42 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.

[0124] 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.

[0125] 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.

[0126] 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 42 QC2304396WOQualcomm Ref. No.2304396WO 43 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.

[0127] 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”).

[0128] FIG. 5 is a diagram 500 illustrating various downlink channels within an example downlink slot. In FIG. 5, 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. In the example of FIG. 5, a numerology of 15 kHz is used. Thus, in the time domain, the illustrated slot is one millisecond (ms) in length, divided into 14 symbols.

[0129] In NR, the channel bandwidth, or system bandwidth, is divided into multiple bandwidth parts (BWPs). A BWP is a contiguous set of RBs selected from a contiguous subset of the common RBs for a given numerology on a given carrier. Generally, a maximum of four BWPs can be specified in the downlink and uplink. That is, a UE can be configured with up to four BWPs on the downlink, and up to four BWPs on the uplink. Only one BWP (uplink or downlink) may be active at a given time, meaning the UE may only receive or transmit over one BWP at a time. On the downlink, the bandwidth of each BWP should be equal to or greater than the bandwidth of the SSB, but it may or may not contain the SSB.

[0130] Referring to FIG.5, a primary synchronization signal (PSS) is used by a UE to determine subframe / symbol timing and a physical layer identity. A secondary synchronization signal (SSS) is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a PCI. Based on the PCI, the UE can determine the locations of the aforementioned DL-RS. The physical broadcast channel (PBCH), which carries a master information block (MIB), may be logically grouped with 43 QC2304396WOQualcomm Ref. No.2304396WO 44 the PSS and SSS to form an SSB (also referred to as an SS / PBCH). The MIB provides a number of RBs in the downlink system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH, such as system information blocks (SIBs), and paging messages.

[0131] The physical downlink control channel (PDCCH) carries downlink control information (DCI) within one or more control channel elements (CCEs), each CCE including one or more RE group (REG) bundles (which may span multiple symbols in the time domain), each REG bundle including one or more REGs, each REG corresponding to 12 resource elements (one resource block) in the frequency domain and one OFDM symbol in the time domain. The set of physical resources used to carry the PDCCH / DCI is referred to in NR as the control resource set (CORESET). In NR, a PDCCH is confined to a single CORESET and is transmitted with its own DMRS. This enables UE-specific beamforming for the PDCCH.

[0132] In the example of FIG. 5, there is one CORESET per BWP, and the CORESET spans three symbols (although it may be only one or two symbols) in the time domain. Unlike LTE control channels, which occupy the entire system bandwidth, in NR, PDCCH channels are localized to a specific region in the frequency domain (i.e., a CORESET). Thus, the frequency component of the PDCCH shown in FIG.5 is illustrated as less than a single BWP in the frequency domain. Note that although the illustrated CORESET is contiguous in the frequency domain, it need not be. In addition, the CORESET may span less than three symbols in the time domain.

[0133] The DCI within the PDCCH carries information about uplink resource allocation (persistent and non-persistent) and descriptions about downlink data transmitted to the UE, referred to as uplink and downlink grants, respectively. More specifically, the DCI indicates the resources scheduled for the downlink data channel (e.g., PDSCH) and the uplink data channel (e.g., physical uplink shared channel (PUSCH)). Multiple (e.g., up to eight) DCIs can be configured in the PDCCH, and these DCIs can have one of multiple formats. For example, there are different DCI formats for uplink scheduling, for downlink scheduling, for uplink transmit power control (TPC), etc. A PDCCH may be transported by 1, 2, 4, 8, or 16 CCEs in order to accommodate different DCI payload sizes or coding rates. 44 QC2304396WOQualcomm Ref. No.2304396WO 45

[0134] A collection of resource elements (REs) that are used for transmission of PRS is referred to as a “PRS resource.” The collection of resource elements can span multiple PRBs in the frequency domain and ‘N’ (such as 1 or more) consecutive symbol(s) within a slot in the time domain. In a given OFDM symbol in the time domain, a PRS resource occupies consecutive PRBs in the frequency domain.

[0135] The transmission of a PRS resource within a given PRB has a particular comb size (also referred to as the “comb density”). A comb size ‘N’ represents the subcarrier spacing (or frequency / tone spacing) within each symbol of a PRS resource configuration. Specifically, for a comb size ‘N,’ PRS are transmitted in every Nth subcarrier of a symbol of a PRB. For example, for comb-4, for each symbol of the PRS resource configuration, REs corresponding to every fourth subcarrier (such as subcarriers 0, 4, 8) are used to transmit PRS of the PRS resource. Currently, comb sizes of comb-2, comb-4, comb-6, and comb-12 are supported for DL-PRS. FIG. 4 illustrates an example PRS resource configuration for comb-4 (which spans four symbols). That is, the locations of the shaded REs (labeled “R”) indicate a comb-4 PRS resource configuration.

[0136] Currently, a DL-PRS resource may span 2, 4, 6, or 12 consecutive symbols within a slot with a fully frequency-domain staggered pattern. A DL-PRS resource can be configured in any higher layer configured downlink or flexible (FL) symbol of a slot. There may be a constant energy per resource element (EPRE) for all REs of a given DL-PRS resource. The following are the frequency offsets from symbol to symbol for comb sizes 2, 4, 6, and 12 over 2, 4, 6, and 12 symbols. 2-symbol comb-2: {0, 1}; 4-symbol comb-2: {0, 1, 0, 1}; 6-symbol comb-2: {0, 1, 0, 1, 0, 1}; 12-symbol comb-2: {0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1}; 4-symbol comb-4: {0, 2, 1, 3} (as in the example of FIG. 4); 12-symbol comb-4: {0, 2, 1, 3, 0, 2, 1, 3, 0, 2, 1, 3}; 6-symbol comb-6: {0, 3, 1, 4, 2, 5}; 12-symbol comb-6: {0, 3, 1, 4, 2, 5, 0, 3, 1, 4, 2, 5}; and 12-symbol comb-12: {0, 6, 3, 9, 1, 7, 4, 10, 2, 8, 5, 11}.

[0137] A “PRS resource set” is a set of PRS resources used for the transmission of PRS signals, where each PRS resource has a PRS resource ID. In addition, the PRS resources in a PRS resource set are associated with the same TRP. A PRS resource set is identified by a PRS resource set ID and is associated with a particular TRP (identified by a TRP ID). In addition, the PRS resources in a PRS resource set have the same periodicity, a common muting pattern configuration, and the same repetition factor (such as “PRS- 45 QC2304396WOQualcomm Ref. No.2304396WO 46 ResourceRepetitionFactor”) across slots. The periodicity is the time from the first repetition of the first PRS resource of a first PRS instance to the same first repetition of the same first PRS resource of the next PRS instance. The periodicity may have a length selected from 2^μ*{4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 640, 1280, 2560, 5120, 10240} slots, with μ = 0, 1, 2, 3. The repetition factor may have a length selected from {1, 2, 4, 6, 8, 16, 32} slots.

[0138] A PRS resource ID in a PRS resource set is associated with a single beam (or beam ID) transmitted from a single TRP (where a TRP may transmit one or more beams). That is, each PRS resource of a PRS resource set may be transmitted on a different beam, and as such, a “PRS resource,” or simply “resource,” also can be referred to as a “beam.” Note that this does not have any implications on whether the TRPs and the beams on which PRS are transmitted are known to the UE.

[0139] A “PRS instance” or “PRS occasion” is one instance of a periodically repeated time window (such as a group of one or more consecutive slots) where PRS are expected to be transmitted. A PRS occasion also may be referred to as a “PRS positioning occasion,” a “PRS positioning instance, a “positioning occasion,” “a positioning instance,” a “positioning repetition,” or simply an “occasion,” an “instance,” or a “repetition.”

[0140] A “positioning frequency layer” (also referred to simply as a “frequency layer”) is a collection of one or more PRS resource sets across one or more TRPs that have the same values for certain parameters. Specifically, the collection of PRS resource sets has the same subcarrier spacing and cyclic prefix (CP) type (meaning all numerologies supported for the physical downlink shared channel (PDSCH) are also supported for PRS), the same Point A, the same value of the downlink PRS bandwidth, the same start PRB (and center frequency), and the same comb-size. The Point A parameter takes the value of the parameter “ARFCN-ValueNR” (where “ARFCN” stands for “absolute radio-frequency channel number”) and is an identifier / code that specifies a pair of physical radio channel used for transmission and reception. The downlink PRS bandwidth may have a granularity of four PRBs, with a minimum of 24 PRBs and a maximum of 272 PRBs. Currently, up to four frequency layers have been defined, and up to two PRS resource sets may be configured per TRP per frequency layer.

[0141] The concept of a frequency layer is somewhat like the concept of component carriers and bandwidth parts (BWPs), but different in that component carriers and BWPs are used by 46 QC2304396WOQualcomm Ref. No.2304396WO 47 one base station (or a macro cell base station and a small cell base station) to transmit data channels, while frequency layers are used by several (usually three or more) base stations to transmit PRS. A UE may indicate the number of frequency layers it can support when it sends the network its positioning capabilities, such as during an LTE positioning protocol (LPP) session. For example, a UE may indicate whether it can support one or four positioning frequency layers.

[0142] Note that the terms “positioning reference signal” and “PRS” generally refer to specific reference signals that are used for positioning in NR and LTE systems. However, as used herein, the terms “positioning reference signal” and “PRS” may also refer to any type of reference signal that can be used for positioning, such as but not limited to, PRS as defined in LTE and NR, TRS, PTRS, CRS, CSI-RS, DMRS, PSS, SSS, SSB, SRS, UL-PRS, etc. In addition, the terms “positioning reference signal” and “PRS” may refer to downlink, uplink, or sidelink positioning reference signals, unless otherwise indicated by the context. If needed to further distinguish the type of PRS, a downlink positioning reference signal may be referred to as a “DL-PRS,” an uplink positioning reference signal (e.g., an SRS-for-positioning, PTRS) may be referred to as an “UL-PRS,” and a sidelink positioning reference signal may be referred to as an “SL-PRS.” In addition, for signals that may be transmitted in the downlink, uplink, and / or sidelink (e.g., DMRS), the signals may be prepended with “DL,” “UL,” or “SL” to distinguish the direction. For example, “UL-DMRS” is different from “DL-DMRS.”

[0143] FIG.6 is a diagram of an example PRS configuration 600 for the PRS transmissions of a given base station, according to aspects of the disclosure. In FIG. 6, time is represented horizontally, increasing from left to right. Each long rectangle represents a slot and each short (shaded) rectangle represents an OFDM symbol. In the example of FIG. 6, a PRS resource set 610 (labeled “PRS resource set 1”) includes two PRS resources, a first PRS resource 612 (labeled “PRS resource 1”) and a second PRS resource 614 (labeled “PRS resource 2”). The base station transmits PRS on the PRS resources 612 and 614 of the PRS resource set 610.

[0144] The PRS resource set 610 has an occasion length (N_PRS) of two slots and a periodicity (T_PRS) of, for example, 160 slots or 160 milliseconds (ms) (for 15 kHz subcarrier spacing). As such, both the PRS resources 612 and 614 are two consecutive slots in length and repeat every T_PRS slots, starting from the slot in which the first symbol of the 47 QC2304396WOQualcomm Ref. No.2304396WO 48 respective PRS resource occurs. In the example of FIG. 6, the PRS resource 612 has a symbol length (N_symb) of two symbols, and the PRS resource 614 has a symbol length (N_symb) of four symbols. The PRS resource 612 and the PRS resource 614 may be transmitted on separate beams of the same base station.

[0145] Each instance of the PRS resource set 610, illustrated as instances 620a, 620b, and 620c, includes an occasion of length ‘2’ (i.e., N_PRS=2) for each PRS resource 612, 614 of the PRS resource set. The PRS resources 612 and 614 are repeated every T_PRS slots up to the muting sequence periodicity T_REP. As such, a bitmap of length T_REP would be needed to indicate which occasions of instances 620a, 620b, and 620c of PRS resource set 610 are muted (i.e., not transmitted).

[0146] In an aspect, there may be additional constraints on the PRS configuration 600. For example, for all PRS resources (e.g., PRS resources 612, 614) of a PRS resource set (e.g., PRS resource set 610), the base station can configure the following parameters to be the same: (a) the occasion length (N_PRS), (b) the number of symbols (N_symb), (c) the comb type, and / or (d) the bandwidth. In addition, for all PRS resources of all PRS resource sets, the subcarrier spacing and the cyclic prefix can be configured to be the same for one base station or for all base stations. Whether it is for one base station or all base stations may depend on the UE’s capability to support the first and / or second option.

[0147] FIG. 7 is a diagram 700 illustrating various uplink channels within an example uplink slot. In FIG.7, 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. In the example of FIG. 7, a numerology of 15 kHz is used. Thus, in the time domain, the illustrated slot is one millisecond (ms) in length, divided into 14 symbols.

[0148] A random-access channel (RACH), also referred to as a physical random-access channel (PRACH), may be within one or more slots within a frame based on the PRACH configuration. The PRACH may include six consecutive RB pairs within a slot. The PRACH allows the UE to perform initial system access and achieve uplink synchronization. A physical uplink control channel (PUCCH) may be located on edges of the uplink system bandwidth. The PUCCH carries uplink control information (UCI), such as scheduling requests, CSI reports, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and HARQ ACK / NACK feedback. The 48 QC2304396WOQualcomm Ref. No.2304396WO 49 physical uplink shared channel (PUSCH) carries data, and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0149] In an aspect, the reference signal carried on the REs labeled “R” in FIG. 4 may be SRS. SRS transmitted by a UE may be used by a base station to obtain the channel state information (CSI) for the transmitting UE. CSI describes how an RF signal propagates from the UE to the base station and represents the combined effect of scattering, fading, and power decay with distance. The system uses the SRS for resource scheduling, link adaptation, massive MIMO, beam management, etc.

[0150] A collection of REs that are used for transmission of SRS is referred to as an “SRS resource,” and may be identified by the parameter “SRS-ResourceId.” The collection of resource elements can span multiple PRBs in the frequency domain and ‘N’ (e.g., one or more) consecutive symbol(s) within a slot in the time domain. In a given OFDM symbol, an SRS resource occupies one or more consecutive PRBs. An “SRS resource set” is a set of SRS resources used for the transmission of SRS signals, and is identified by an SRS resource set ID (“SRS-ResourceSetId”).

[0151] The transmission of SRS resources within a given PRB has a particular comb size (also referred to as the “comb density”). A comb size ‘N’ represents the subcarrier spacing (or frequency / tone spacing) within each symbol of an SRS resource configuration. Specifically, for a comb size ‘N,’ SRS are transmitted in every Nth subcarrier of a symbol of a PRB. For example, for comb-4, for each symbol of the SRS resource configuration, REs corresponding to every fourth subcarrier (such as subcarriers 0, 4, 8) are used to transmit SRS of the SRS resource. In the example of FIG.4, the illustrated SRS is comb- 4 over four symbols. That is, the locations of the shaded SRS REs indicate a comb-4 SRS resource configuration.

[0152] Currently, an SRS resource may span 1, 2, 4, 8, or 12 consecutive symbols within a slot with a comb size of comb-2, comb-4, or comb-8. The following are the frequency offsets from symbol to symbol for the SRS comb patterns that are currently supported.1-symbol comb-2: {0}; 2-symbol comb-2: {0, 1}; 2-symbol comb-4: {0, 2}; 4-symbol comb-2: {0, 1, 0, 1}; 4-symbol comb-4: {0, 2, 1, 3} (as in the example of FIG. 4); 8-symbol comb-4: {0, 2, 1, 3, 0, 2, 1, 3}; 12-symbol comb-4: {0, 2, 1, 3, 0, 2, 1, 3, 0, 2, 1, 3}; 4-symbol comb-8: {0, 4, 2, 6}; 8-symbol comb-8: {0, 4, 2, 6, 1, 5, 3, 7}; and 12-symbol comb-8: {0, 4, 2, 6, 1, 5, 3, 7, 0, 4, 2, 6}. 49 QC2304396WOQualcomm Ref. No.2304396WO 50

[0153] Generally, as noted above, a UE transmits SRS to enable the receiving base station (either the serving base station or a neighboring base station) to measure the channel quality (i.e., CSI) between the UE and the base station. However, SRS can also be specifically configured as uplink positioning reference signals for uplink-based positioning procedures, such as uplink time difference of arrival (UL-TDOA), round-trip-time (RTT), uplink angle-of-arrival (UL-AoA), etc. As used herein, the term “SRS” may refer to SRS configured for channel quality measurements or SRS configured for positioning purposes. The former may be referred to herein as “SRS-for-communication” and / or the latter may be referred to as “SRS-for-positioning” or “positioning SRS” when needed to distinguish the two types of SRS.

[0154] Several enhancements over the previous definition of SRS have been proposed for SRS- for-positioning (also referred to as “UL-PRS”), such as a new staggered pattern within an SRS resource (except for single-symbol / comb-2), a new comb type for SRS, new sequences for SRS, a higher number of SRS resource sets per component carrier, and a higher number of SRS resources per component carrier. In addition, the parameters “SpatialRelationInfo” and “PathLossReference” are to be configured based on a downlink reference signal or SSB from a neighboring TRP. Further still, one SRS resource may be transmitted outside the active BWP, and one SRS resource may span across multiple component carriers. Also, SRS may be configured in RRC connected state and only transmitted within an active BWP. Further, there may be no frequency hopping, no repetition factor, a single antenna port, and new lengths for SRS (e.g., 8 and 12 symbols). There also may be open-loop power control and not closed-loop power control, and comb- 8 (i.e., an SRS transmitted every eighth subcarrier in the same symbol) may be used. Lastly, the UE may transmit through the same transmit beam from multiple SRS resources for UL-AoA. All of these are features that are additional to the current SRS framework, which is configured through RRC higher layer signaling (and potentially triggered or activated through a MAC control element (MAC-CE) or downlink control information (DCI)).

[0155] In NR, there may not be precise timing synchronization across the network. Instead, it may be sufficient to have coarse time-synchronization across base stations (e.g., within a cyclic prefix (CP) duration of the orthogonal frequency division multiplexing (OFDM) 50 QC2304396WOQualcomm Ref. No.2304396WO 51 symbols). RTT-based methods generally only need coarse timing synchronization, and as such, are a preferred positioning method in NR.

[0156] FIG.8 illustrates an example wireless communications system 800, according to aspects of the disclosure. In the example of FIG. 8, a UE 804 (e.g., any of the UEs described herein) is attempting to calculate an estimate of its location, or assist another entity (e.g., a base station or core network component, another UE, a location server, a third party application, etc.) to calculate an estimate of its location. The UE 804 may transmit and receive wireless signals to and from a plurality of network nodes (labeled “Node”) 802- 1, 802-2, and 802-3 (collectively, network nodes 802). The network nodes 802 may include one or more base stations (e.g., any of the base stations described herein), one or more reconfigurable intelligent displays (RIS), one or more positioning beacons, one or more UEs (e.g., connected over sidelinks), etc.

[0157] In a network-centric RTT positioning procedure the serving base station (e.g., one of network nodes 802) instructs the UE 804 to measure RTT measurement signals (e.g., PRS) from two or more neighboring network nodes 802 (and typically the serving base station, as at least three network nodes 802 are needed for a two-dimensional location estimate). The involved network nodes 802 transmit RTT measurement signals on low reuse resources (e.g., resources used by the network nodes 802 to transmit system information, where the network nodes 802 are base stations) allocated by the network (e.g., location server 230, LMF 270, SLP 272). The UE 804 records the arrival time (also referred to as the receive time, reception time, time of reception, or time of arrival) of each RTT measurement signal relative to the UE’s 804 current downlink timing (e.g., as derived by the UE 804 from a downlink signal received from its serving base station), and transmits a common or individual RTT response signal (e.g., SRS) to the involved network nodes 802 on resources allocated by its serving base station. The UE 804, if it not the positioning entity, reports a UE reception-to-transmission (Rx-Tx) time difference measurement to the positioning entity. The UE Rx-Tx time difference measurement indicates the time difference between the arrival time of each RTT measurement signal at the UE 804 and the transmission time(s) of the RTT response signal(s). Each involved network node 802 also reports, to the positioning entity, a network node Rx-Tx time difference measurement (also referred to as a base station (BS) or gNB Rx-Tx time 51 QC2304396WOQualcomm Ref. No.2304396WO 52 difference measurement), which indicates the difference between the transmission time of the RTT measurement signal and the reception time of the RTT response signal.

[0158] A UE-centric RTT positioning procedure is similar to the network-based procedure, except that the UE 804 transmits uplink RTT measurement signal(s) (e.g., on resources allocated by the serving base station). The uplink RTT measurement signal(s) are measured by multiple network nodes 802 in the neighborhood of the UE 804. Each involved network node 802 responds with a downlink RTT response signal and reports a network node Rx-Tx time difference measurement to the positioning entity. The network node Rx-Tx time difference measurement indicates the time difference between the arrival time of the RTT measurement signal at the network node 802 and the transmission time of the RTT response signal. The UE 804, if it is not the positioning entity, reports, for each network node 802, a UE Rx-Tx time difference measurement that indicates the difference between the transmission time of the RTT measurement signal and the reception time of the RTT response signal.

[0159] In order to determine the location (x, y) of the UE 804, the positioning entity needs to know the locations of the network nodes 802, which may be represented in a reference coordinate system as (x_k, y_y), where k=1, 2, 3 in the example of FIG. 8. Where the UE 804 is the positioning entity, a location server with knowledge of the network geometry (e.g., location server 230, LMF 270, SLP 272) may provide the locations of the involved network nodes 802 to the UE 804.

[0160] The positioning entity determines each distance 810 (d_k, where k=1, 2, 3) between the UE 804 and the respective network node 802 based on the UE Rx-Tx and network node Rx-Tx time difference measurements and the speed of light, as described further below with reference to FIG. 9. Specifically, in the example of FIG. 8, the distance 810-1 between the UE 804 and the network node 802-1 is d_1, the distance 810-2 between the UE 804 and the network node 802-2 is d_2, and the distance 810-3 between the UE 804 and the network node 802-3 is d_3. Once each distance 810 is determined, the positioning entity can solve for the location (x, y) of the UE 804 by using a variety of known geometric techniques, such as trilateration. From FIG.8, it can be seen that the location of the UE 804 ideally lies at the common intersection of three semicircles, each semicircle being defined by radius dk and center (x_k, y_k), where k=1, 2, 3. 52 QC2304396WOQualcomm Ref. No.2304396WO 53

[0161] FIG. 9 is a diagram 900 showing example timings of RTT measurement signals exchanged between a network node 902 (labeled “Node”) and a UE 904, according to aspects of the disclosure. The UE 904 may be any of the UEs described herein. The network node 902 may be a base station (e.g., any of the base stations described herein), an RIS, a positioning beacon, another UE (e.g., connected over a sidelink), or the like.

[0162] In the example of FIG. 9, the network node 902 (labeled “BS”) sends an RTT measurement signal 910 (e.g., PRS) to the UE 904 at time T_1. The RTT measurement signal 910 has some propagation delay T_Prop as it travels from the network node 902 to the UE 904. At time T_2 (the reception time of the RTT measurement signal 910 at the UE 904), the UE 904 measures the RTT measurement signal 910. After some UE processing time, the UE 904 transmits an RTT response signal 920 (e.g., SRS) at time T_3. After the propagation delay T_Prop, the network node 902 measures the RTT response signal 920 from the UE 904 at time T_4 (the reception time of the RTT response signal 920 at the network node 902).

[0163] The UE 904 reports the difference between time T_3 and time T_2 (i.e., the UE’s 904 Rx-Tx time difference measurement, shown as UE_Rx-Tx 912) to the positioning entity. Similarly, the network node 902 reports the difference between time T_4 and time T_1 (i.e., the network node’s 902 Rx-Tx time difference measurement, shown as Node_Rx- Tx 922) to the positioning entity. Using these measurements and the known speed of light, the positioning entity can calculate the distance to the UE 904 as d = 1 / 2*c*(Node_Rx-Tx – UE_Rx-Tx) = 1 / 2*c*(T_4 – T_1) – 1 / 2*c*(T_3 – T_2), where c is the speed of light.

[0164] Based on the known location of the network node 902 and the distance between the UE 904 and the network node 902 (and at least two other network nodes 902), the positioning entity can calculate the location of the UE 904. As shown in FIG. 8, the location of the UE 904 lies at the common intersection of three semicircles, each semicircle being defined by a radius of the distance between the UE 904 and a respective network node 902.

[0165] In an aspect, the positioning entity may calculate the UE’s 804 / 904 location using a two- dimensional coordinate system; however, the aspects disclosed herein are not so limited, and may also be applicable to determining locations using a three-dimensional coordinate system, if the extra dimension is desired. Additionally, while FIG. 8 illustrates one UE 53 QC2304396WOQualcomm Ref. No.2304396WO 54 804 and three network nodes 802 and FIG.9 illustrates one UE 904 and one network node 902, as will be appreciated, there may be more UEs 804 / 904 and more network nodes 802 / 902.

[0166] FIG. 10 is a diagram 1000 showing example timings of RTT measurement signals exchanged between a network node 1002 and a UE 1004, according to aspects of the disclosure. The diagram 1000 is similar to the diagram 900, except that it includes processing delays that may occur at both the network node 1002 (labeled “Node”) and the UE 1004 when transmitting and receiving the RTT measurement and response signals. The network node 1002 may be a base station (e.g., any of the base stations), an RIS (e.g., RIS 410), another UE (e.g., any of the UEs described herein), or other network node capable of performing an RTT positioning procedure. As a specific example, the network node 1002 and the UE 1004 may correspond to the base station 902 and the UE 904 in FIG.9.

[0167] Referring now to potential processing delays, at the network node 1002, there is a transmission delay 1014 between the time T_1 that the network node’s 1002 baseband (labeled “BB”) generates the RTT measurement signal 1010 (e.g., a PRS) and the time T_2 that the network node’s 1002 antenna(s) (labeled “Ant”) transmit the RTT measurement signal 1010. At the UE 1004, there is a reception delay 1016 between the time T_3 that the UE’s 604 antenna(s) (labeled “Ant”) receive the RTT measurement signal 1010 and the time T_4 that the UE’s 1004 baseband (labeled “BB”) processes the RTT measurement signal 1010.

[0168] Similarly, for the RTT response signal 1020 (e.g., an SRS), there is a transmission delay 1026 between the time T_5 that the UE’s 1004 baseband generates the RTT response signal 1020 and the time T_6 that the UE’s 1004 antenna(s) transmit the RTT response signal 1020. At the network node 1002, there is a reception delay 1024 between the time T_7 that the network node’s 1002 antenna(s) receive the RTT response signal 1020 and the time T_8 that the network node’s 1002 baseband processes the RTT response signal 1020.

[0169] The difference between times T_2 and T_1 (i.e., transmission delay 1014) and times T_8 and T_7 (i.e., reception delay 1024) is referred to as the network node’s 1002 “group delay.” The difference between times T_4 and T_3 (i.e., reception delay 1016) and times T_6 and T_5 (i.e., transmission delay 1026) is referred to as the UE’s 1004 “group delay.” 54 QC2304396WOQualcomm Ref. No.2304396WO 55 The group delay includes a hardware group delay, a group delay attributable to software / firmware, or both. More specifically, although software and / or firmware may contribute to group delay, the group delay is primarily due to internal hardware delays between the baseband and the antenna(s) of the network node 1002 and the UE 1004.

[0170] As shown in FIG. 10, because of the reception delay 1016 and the transmission delay 1026, the UE’s 1004 Rx-Tx time difference measurement 1012 does not represent the difference between the actual reception time at time T_3 and the actual transmission time at time T_6. Similarly, because of the transmission delay 1014 and the reception delay 1024, the network node’s 1002 Rx-Tx time difference measurement 1022 does not represent the difference between the actual transmission time at time T_2 and the actual reception time at time T_7. Thus, as shown, group delays, such as reception delays 1016 and 1024 and transmission delays 1014 and 1026, can contribute to timing errors and / or calibration errors that can impact RTT measurements, as well as other measurements, such as TDOA, RSTD, etc. This can in turn can impact positioning performance. For example, in some designs, a 10 ns error will introduce three meters of error in the final location estimate.

[0171] In some cases, the UE 1004 can calibrate its group delay and compensate for it so that the UE Rx-Tx time difference measurement 1012 reflects the actual reception and transmission times from its antenna(s). Alternatively, the UE 1004 can report its group delay to the positioning entity (if not the UE 1004), which can then subtract the group delay from the UE Rx-Tx time difference measurement 1012 when determining the final distance between the network node 1002 and the UE 1004. Similarly, the network node 1002 may be able to compensate for its group delay in the network node Rx-Tx time difference measurement 1022, or simply report the group delay to the positioning entity.

[0172] In some designs, for UE Rx-Tx definition and measurement the Tx timing that is used in the UE Rx-Tx is supposed to be the UE’s timing at the time of the reception of the PRS from a transmission point (TP). However, if PRS and SRS are far away (in time), a UE may adjust the SRS Tx timing for one or more of the following reasons: x Autonomous timing advance (TA) changes x Requested TA changes by the serving gNB

[0173] A problem arises with the gNB Rx-Tx and the computation of RTT. If the UE reports UE Rx-Tx according to the current definition as shown below (from TS38.215), if there is a 55 QC2304396WOQualcomm Ref. No.2304396WO 56 TA change before the SRS is transmitted, the SRS will be X nsec later / earlier, and the gNB Rx-Tx will be estimated to be X nsec later / earlier. When the LMF sums up the UE Rx-Tx and the gNB Rx-Tx, the final RTT will also have a bias of X nsec. One way to solve this problem is for UE to report the UE Rx-Tx such that the Tx timing is that of the subframe that carries the SRS, or more generally speaking, let the UE report an UL timestamp which can be used to determine when the TUE-TX is valid.

[0174] In some designs, UE Rx-Tx is defined as follows: on to me the ent the nd E.Table 1: UE Rx-Tx Definition

[0175] Various alternatives related to the UE Rx-Tx time difference have been considered. In one example of an updated UE Rx-Tx definition, subject to UE capability, the UE may report an additional UL Timestamp associated to a UE Rx-Tx measurement, corresponding to the timing of the uplink subframe of a positioning SRS. In this case, the following may be added to the UE Rx-Tx time difference definition (similar to the definition for HD-FDD UE in TS 36.214) from Table 1 (above): If the UE does not transmit SRS in subframe #j, and if the UE reports an additional timestamp for the positioning SRS associated to the measurement, it shall compensate for the difference in the transmit timing of uplink#j and the transmission timing of the subframe containing positioning SRS. 56 QC2304396WOQualcomm Ref. No.2304396WO 57

[0176] FIG. 11 illustrates a positioning information exchange procedure 1100, in accordance with aspects of the disclosure. Generally, in FIG. 11, the LMF may request SRS transmission characteristics in POSITIONING INFORMATION REQUEST. The NG- RAN node responds with SRS configuration with PCI (optional field) in POSITIONING INFORMATION RESPONSE. In some designs, the LMF may create a pool of pos-SRS configurations indexed by PCI.

[0177] Referring to FIG. 11 in more detail, the LMF initiates the procedure by sending a POSITIONING INFORMATION REQUEST message to the NG-RAN node.

[0178] If the Requested SRS Transmission Characteristics IE is included in the POSITIONING INFORMATION REQUEST message, the NG-RAN node may take this information into account when configuring SRS transmissions for the UE, and it shall include the SRS Configuration IE and the SFN Initialisation Time IE in the POSITIONING INFORMATION RESPONSE message.

[0179] If the Spatial Relation Information per SRS Resource IE and the Periodicity List IE are both included in the Requested SRS Transmission Characteristics IE, the NG-RAN node shall consider that the Spatial Relation per SRS Resource Item IE and the Periodicity List Item IE have one-to-one mapping relation.

[0180] If the UE Reporting Information IE is included in the POSITIONING INFORMATION REQUEST message, the NG-RAN node may take this information into account for allocating proper CG-SDT resources when positioning a UE.

[0181] If the UE TEG Information Request IE is included in the POSITIONING INFORMATION REQUEST message and set to "onDemand", the NG-RAN node shall, if supported, provide the UE Tx TEG association in the POSITIONING INFORMATION RESPONSE message.

[0182] If the UE TEG Information Request IE is set to "periodic", the NG-RAN node shall, if supported, reply with the POSITIONING INFORMATION RESPONSE message without including any UE Tx TEG association in this message. The NG-RAN node shall then take the UE TEG Reporting Periodicity IE into account when configuring the UE’s periodic UE Tx TEG association reporting and initiate the Positioning Information Update procedure for reporting the UE Tx TEG association received from the UE, if any.

[0183] In terms of RTT computation at LMF, UE reports UE Rx-Tx time difference and time stamp. NG-RAN reports gNB Rx-Tx time difference and time stamp. LMF is aware of 57 QC2304396WOQualcomm Ref. No.2304396WO 58 the DL subframe boundary differences across NG-RAN nodes. LMF investigates the time stamps and puts together UE and gNB Rx-Tx time difference measurements taken at the closest proximity of time.

[0184] This framework works well with the current definition of UE (from Table 1 above) and gNB Rx-Tx time difference since the respective Rx-Tx time differences are not coupled together (i.e., UE may receive PRS and measure UE Rx-Tx time difference, and transmits SRS for gNB measurement independently under an implicit assumption that the RTT does not change during this timeline)

[0185] Now, according to the updated definition of UE Rx-Tx time difference discussed above, if the UE compensates the UE Rx-Tx time difference so that the UE Rx-Tx time difference is valid for a SRS transmission at a different subframe, the UE has to put the subframe # that carried the SRS. In this case, LMF must put together this UE measurement with corresponding gNB measurement.

[0186] The updated definition of UE Rx-Tx time difference discussed above theoretically solves the problem of linking UE Rx-Tx time difference measurement to a SRS transmission. However, the UE is free to choose when to measure PRS and which SRS to link to. From the LMF perspective, this is problematic because the network (e.g., gNBs) may not be able to measure the particular SRS instance the UE chooses to link for the UE Rx-Tx time difference measurement.

[0187] Aspects of the disclosure related to a defined Rx-Tx measurement window for UE Rx-Tx time difference. In an aspect, both the UE and various wireless network component(s) (e.g., gNB(s) or TRP(s), etc.) may be configured with the Rx-Tx measurement window, such that the problem of linking the UE Rx-Tx time difference measurement(s) to SRS is mitigated. In other aspects, a measurement report including measurement hypotheses associated with multiple DL-PRS occasions per UL-SRS-P occasion may be reported (with or without Rx-Tx measurement window), which permits a more flexible coupling (or linking) of the UE Rx-Tx time difference measurement(s) to SRS at a position estimation entity (e.g., LMF for network-assisted position estimation or UE for UE-based position estimation). Such aspects may provide various technical advantages, such as improved position estimation accuracy, reduced position estimation latency, and so on.

[0188] FIG.12 illustrates an exemplary process 1200 of communications according to an aspect of the disclosure. The process 1200 of FIG.12 is performed by a UE, such as UE 302. 58 QC2304396WOQualcomm Ref. No.2304396WO 59

[0189] Referring to FIG.12, at 1210, UE 302 (e.g., receiver 312 or 322, etc.) receives an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE. For example, the UL-SRS-P resource configuration may be received via RRC signaling. In some designs, UE 302 may only transmit on a subset of UL-SRS-P occasions, rather than each UL-SRS-P occasion in the subset of UL-SRS-P occasions.

[0190] Referring to FIG.12, at 1220, UE 302 (e.g., receiver 312 or 322, etc.) receives a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL- PRS occasions associated with the position estimation session of the UE. For example, the DL-PRS resource configuration may be received via RRC signaling.

[0191] Referring to FIG. 12, at 1230, UE 302 (e.g., receiver 312 or 322, etc.) receives an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE.

[0192] Referring to FIG. 12, at 1240, UE 302 (e.g., receiver 312 or 322, processor(s) 332, Rx- Tx component 342, etc.), for at least one UL-SRS-P occasion configured by the UL-SRS- P resource configuration within the Rx-Tx measurement window, determines a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window.

[0193] Referring to FIG. 12, at 1250, UE 302 (e.g., transmitter 314 or 324, etc.) transmits a measurement report that comprises information sufficient to obtain the determined Rx- Tx measurement hypotheses.

[0194] Referring to FIG.12, in some designs, the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or the at least one DL-PRS occasion comprises each DL-PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

[0195] Referring to FIG.12, in some designs, the indication of the Rx-Tx measurement window is received from a wireless network component via radio resource configuration (RRC) signaling.

[0196] Referring to FIG. 12, in some designs, the Rx-Tx measurement window is defined as a set of DL slots. 59 QC2304396WOQualcomm Ref. No.2304396WO 60

[0197] Referring to FIG.12, in some designs, the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx- Tx measurement window.

[0198] Referring to FIG.12, in some designs, the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0199] Referring to FIG.12, in some designs, the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0200] Referring to FIG. 12, in some designs, the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL- SRS-P occasion.

[0201] Referring to FIG. 12, in some designs, the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0202] FIG.13 illustrates an exemplary process 1300 of communications according to an aspect of the disclosure. The process 1300 of FIG. 14 is performed by a wireless network component (e.g., gNB / BS 304 or O-RAN component). In some designs, the wireless network component is a serving wireless network component of the UE. In a further aspect, the process 1300 of FIG. 13 at the wireless network component may correspond to a process performed in parallel with the process 1200 of FIGS.12 at the UE.

[0203] Referring to FIG.13, at 1310, the wireless network component (e.g., receiver 352 or 362, network transceiver(s) 380, etc.) receives an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE). In some designs, the UL-SRS-P resource configuration is received from a position estimation entity (e.g., UE in case of UE-based position estimation, LMF in case of network-assisted position estimation).

[0204] Referring to FIG.13, at 1320, the wireless network component (e.g., receiver 352 or 362, network transceiver(s) 380, etc.) receives a downlink positioning reference signal (DL- 60 QC2304396WOQualcomm Ref. No.2304396WO 61 PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE. In some designs, the DL-PRS resource configuration is received from a position estimation entity (e.g., UE in case of UE-based position estimation, LMF in case of network-assisted position estimation).

[0205] Referring to FIG.13, at 1330, the wireless network component (e.g., receiver 352 or 362, network transceiver(s) 380, etc.) receives an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window. In some designs, Rx-Tx measurement window is received from a position estimation entity (e.g., UE in case of UE-based position estimation, LMF in case of network-assisted position estimation).

[0206] Referring to FIG. 13, at 1340, the wireless network component (e.g., transmitter 354 or 364, network transceiver(s) 380, etc.) transmits one or more indications of the Rx-Tx measurement window to one or more neighboring wireless network components.

[0207] Referring to FIG. 13, in some designs, the one or more indications of the Rx-Tx measurement window is transmitted via backhaul signaling.

[0208] Referring to FIG. 13, in some designs, the Rx-Tx measurement window is defined as a set of DL slots.

[0209] Referring to FIG.13, in some designs, the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx- Tx measurement window.

[0210] Referring to FIG.13, in some designs, the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window. In some designs, the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0211] Referring to FIG. 13, in some designs, the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0212] FIG.14 illustrates an exemplary process 1400 of communications according to an aspect of the disclosure. The process 1400 of FIG. 14 is performed by a position estimation 61 QC2304396WOQualcomm Ref. No.2304396WO 62 entity. In some designs, the position estimation entity may correspond to a network component (e.g., an LMF integrated at gNB / BS 304 or O-RAN component or a remote location server such as network entity 306, etc.). In other designs, the position estimation entity may correspond to another UE (e.g., sidelink anchor UE) or to the target UE itself (e.g., for UE-based position estimation, in which case any Rx / Tx operations between the UE and the position estimation entity may correspond to transfer of information between different logical components of the UE over a data bus, etc.). In a further aspect, the process 1400 of FIG. 14 at the position estimation entity may correspond to a process performed in parallel with the processes 1200-1300 of FIGS. 12-13 at the UE and the wireless network component, respectively.

[0213] Referring to FIG.14, at 1410, the position estimation entity (e.g., transmitter 314 or 324 or 354 or 364, data bus 334 or data bus 382, network transceiver(s) 380 or 390, etc.) transmits an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE).

[0214] Referring to FIG.14, at 1420, the position estimation entity (e.g., transmitter 314 or 324 or 354 or 364, data bus 334 or data bus 382, network transceiver(s) 380 or 390, etc.) transmits a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE.

[0215] Referring to FIG.14, at 1430, the position estimation entity (e.g., transmitter 314 or 324 or 354 or 364, data bus 334 or data bus 382, network transceiver(s) 380 or 390, etc.) transmits an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx- Tx measurement window.

[0216] Referring to FIG.14, at 1440, the position estimation entity (e.g., receiver 312 or 322 or 352 or 362 or data bus 334 or data bus 382 or network transceiver(s) 380 or 390, etc.) receives a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis 62 QC2304396WOQualcomm Ref. No.2304396WO 63 associated with a time difference between the UL-SRS-P occasion and at least one DL- PRS occasion within the Rx-Tx measurement window.

[0217] Referring to FIG.14, at 1450, the position estimation entity (e.g., processor(s) 332 or 384 or 394, Rx-Tx Component 342or 388 or 398, etc.) determines a position estimate of the UE based at least in part on the information.

[0218] Referring to FIG.14, in some designs, the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or the at least one DL-PRS occasion comprises each DL-PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof

[0219] Referring to FIG.14, in some designs, the indication of the Rx-Tx measurement window is transmitted from the UE and at least one wireless network component associated with the position estimation session of the UE.

[0220] Referring to FIG. 14, in some designs, the Rx-Tx measurement window is defined as a set of DL slots.

[0221] Referring to FIG.14, in some designs, the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx- Tx measurement window.

[0222] Referring to FIG.14, in some designs, the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window. In some designs, the measurement report comprises Rx- Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx- Tx measurement window.

[0223] Referring to FIG. 14, in some designs, the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL- SRS-P occasion.

[0224] Referring to FIG. 14, in some designs, the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE. 63 QC2304396WOQualcomm Ref. No.2304396WO 64

[0225] Referring to FIGS. 12-14, in a specific example, the network (e.g., position estimation entity) may specify when to it expects the UE to measure UE Rx-Tx time difference using PRS and which SRS resources to link to. In an aspect, predefined rule(s) may be configured or pre-defined indicating which SRS occasions to choose. In another aspect, a Rx-Tx measurement window may be defined to specify when the network expects the UE to measure UE Rx-Tx time difference using PRS and which SRS resources to link to. In an aspect, serving gNB specifies a Rx-Tx measurement window within which the UE will measure UE Rx-Tx time difference. In some designs, the serving gNB informs neighboring gNBs the MW configuration

[0226] FIG.15 illustrates an example implementation 1500 of the processes 1200-1400 of FIGS. 12-14, respectively, in accordance with aspects of the disclosure. In FIG. 15, UL / DL in UE / gNB reference timing are indicated. The gNB transmits DL-PRS at gNB DL subframe 4, and (due to TA) the UE receives the DL-PRS at UE DL subframe 4. The UE transmits UL-SRS-P at UE UL subframe 7, and the gNB receives the UL-SRS-P at gNB UL subframe 7.

[0227] Referring to FIG. 15, in some designs, the network may indicate a UE SRS resource identifier. The UE measures UE Rx-Tx Time difference of the DL-PRS and links it to the nearest occurrence of the indicated SRS resource in future. Consider a scenario where the TA is very high (e.g., such as in non-terrestrial network (NTN) use case, where the NTN entity or satellite is fast-moving and relatively far away), and a part of TA is not known to network. In this case, the network (e.g., LMF) may not be able to ascertain which SRS instance will be closest to DL-PRS at UE time frame. From UE reported TA (over MAC- CE, accurate up to slot level), network may guess which SRS instances might be in proximity with a given DL-PRS instance / occasion. For example, the LMF may schedule more DL-PRS resources, but the UE and / or gNB(s) only choose to transmit / measure one / few of the UL-SRS-P instances. The network (e.g., LMF) may configure UE could report Real-Time Traffic Distribution (RTTD) linked to any / particular UL-SRS-P instance(s) within a Rx-Tx measurement window.

[0228] FIG.16 illustrates an example implementation 1600 of the processes 1200-1400 of FIGS. 12-14, respectively, in accordance with aspects of the disclosure. In FIG. 16, UL / DL in UE reference timing are indicated, where an Rx-Tx measurement window 1610 is specified. For example, gNB configures the Rx-Tx measurement window 1610 with 64 QC2304396WOQualcomm Ref. No.2304396WO 65 PRS / SRS resources to be used for measurement / reporting. When measuring UE Rx-Tx time difference (linked to SRS), UE considers SRS resources within the Rx-Tx measurement window 1610.

[0229] Referring to FIG.16, during the Rx-Tx measurement window 1610, the UE measures Rx time associated with PRS1 and PRS2 and Tx time associated with SRS1 and SRS2. In some designs, for each of SRS1 and SRS2, the UE may determine each possible Rx-Tx measurement hypothesis for each of SRS1 and SRS2. In other words, for SRS1, Rx-Tx measurements are made for each of PRS1 and PRS2, and for SRS2, Rx-Tx measurements are made for each of PRS1 and PRS2, e.g.: x Rx-Tx measurement hypothesis #1: PRS1-to-SRS1, x Rx-Tx measurement hypothesis #2: PRS2-to-SRS1, x Rx-Tx measurement hypothesis #3: PRS1-to-SRS2, x Rx-Tx measurement hypothesis #4: PRS2-to-SRS2,

[0230] While PRS1 and PRS2 each precede SRS1 and SRS2 in the Rx-Tx measurement window 1610, in other designs one or more PRS for which Rx-Tx measurement hypothes(es) are determined may be subsequent to (or may follow) one or more of the SRS(s) in the Rx- Tx measurement window 1610. In other words, UE may report various Rx-Tx measurement hypothes(es) because the UE does not know which UL-SRS-P will be measured / reported by the gNB(s) to the LMF. The LMF may then determine the Rx-Tx measurement by matching one or more of the Rx-Tx measurement hypotheses to the gNB-reported measurement information.

[0231] Referring to FIGS. 12-14, in some designs, the Rx-Tx measurement window may be configured as follows: NR-UE-Rx-Tx-TimeDiffMeasWindow-rXX ::= SEQUENCE { MeasWindowPeriodicityAndStartSlot-rXX DL-PPW-PeriodicityAndStartSlot- r17, length-rXX INTEGER (1..160), srs-PosResourceId-rXX SRS-PosResourceId-r16 OPTIONAL }

[0232] Referring to FIGS. 12-14, in some designs, a starting time of the Rx-Tx measurement window may be specified as a designated DL slot number. In some designs, a length of the Rx-Tx measurement window may be specified a number of slows (e.g., network may 65 QC2304396WOQualcomm Ref. No.2304396WO 66 figure out this value from UE reported TA). Optionally, in some designs, gNB indicates the SRS resource ID. In some designs, if this field is present, the UE only uses instances of this SRS resource ID inside the Rx-Tx measurement window for measurement and reporting.

[0233] Referring to FIGS. 12-14, in some designs, for each DL-PRS ID, the UE may send more than one UE Rx-Tx time difference measurements (i.e., hypotheses) based on UL-SRS-P occasions in the Rx-Tx measurement time window. Current 3GPP standards do not support such measurement reporting (i.e., only one DL-PRS measurement is permitted per UL-SRS-P). In some designs, a new measurement element in top level (e.g., at NR- Multi-RTT-ProvideLocationInformation-r16) since may be defined because-Multi-RTT- MeasList-r16 is not an “OPTIONAL” field in current 3GPP standards, e.g.: NR-Multi-RTT-ProvideLocationInformation-r16 ::= SEQUENCE { nr-Multi-RTT-SignalMeasurementInformation-r16 NR-Multi-RTT- SignalMeasurementInformation-r16 OPTIONAL, nr-Multi-RTT-Error-r16 NR-Multi-RTT-Error-r16 OPTIONAL, ..., [[ nr-Multi-RTT-SignalMeasurementInstances-r17 SEQUENCE (SIZE (1..maxMeasInstances-r17)) OF NR-Multi-RTT-SignalMeasurementInformation-r16 OPTIONAL, ]] [[ nr-Multi-RTT-SignalMeasurementInformation-rXX NR-Multi-RTT- SignalMeasurementInformation-rXX OPTIONAL, ]] } NR-Multi-RTT-SignalMeasurementInformation-rXX ::= SEQUENCE { nr-Multi-RTT-MeasList-r16 NR-Multi-RTT-MeasList-r16, OPTIONAL, nr-Multi-RTT-MeasList-rXX NR-Multi-RTT-MeasList-rXX, OPTIONAL, 66 QC2304396WOQualcomm Ref. No.2304396WO 67 <<copy other parts of NR-Multi-RTT-SignalMeasurementInformation-r16>> }

[0234] In some designs, UE may batch multiple measurement elements for multiple Rx-Tx measurement windows. In other designs, only one measurement element may be reported per Rx-Tx measurement window.

[0235] Referring to FIGS. 12-14, in some designs, UE may report a reference UL-SRS-P occasion in the Rx-Tx measurement window. In this case, one option is for the UE to indicate the UE Rx-Tx time difference that is coupled to this reference UL-SRS-P occasion. In another option, the UE may indicate a difference of UE Rx-Tx time difference for a particular UL-SRS-P occasion relative to the reference UL-SRS-P occasion (e.g., this may save a few bits in the signaling). In some designs, 3GPP standards may be updated as follows to accommodate this functionality, e.g.: NR-Multi-RTT-MeasElement-rXX ::= SEQUENCE { dl-PRS-ID-r16 INTEGER (0..255), nr-PhysCellID-r16 NR-PhysCellID-r16 OPTIONAL, nr-CellGlobalID-r16 NCGI-r15 OPTIONAL, nr-ARFCN-r16 ARFCN-ValueNR-r15 OPTIONAL, nr-DL-PRS-ResourceID-r16 NR-DL-PRS-ResourceID-r16 OPTIONAL, nr-DL-PRS-ResourceSetID-r16 NR-DL-PRS-ResourceSetID-r16 OPTIONAL, nr-UE-RxTxTimeDiffList-rXX ::= SEQUENCE (SIZE(1..nrMaxSRSOccassionsinMW)) OF NR-UE-RxTXTimeDiffMeas-rXX, nr-TimeStamp-rXX NR-TimeStamp-r16, nr-ReferenceSRSOccasion-rXX NR-SRSOccasion-rXX OPTIONAL <<skip>> } NR-SRSOccasion-rXX::= SEQUENCE { srs-PosResourceId-rXX SRS-PosResourceId-r16, srs-TimeStamp-rXX NR-TimeStamp-r16 } NR-UE-RxTXTimeDiffMeas-rXX ::= SEQUENCE { nr-SRSOccasion-rXX NR-SRSOccasion-rXX OPTIONAL, nr-UE-RxTxTimeDiff-rXX CHOICE { 67 QC2304396WOQualcomm Ref. No.2304396WO 68 k0-r16 INTEGER (0..1970049), k1-r16 INTEGER (0..985025), k2-r16 INTEGER (0..492513), k3-r16 INTEGER (0..246257), k4-r16 INTEGER (0..123129), k5-r16 INTEGER (0..61565)}, OPTIONAL, nr-UE-RxTxTimeDiffAdditional-rXX CHOICE { k0-r16 INTEGER (0..8191), k1-r16 INTEGER (0..4095), k2-r16 INTEGER (0..2047), k3-r16 INTEGER (0..1023), k4-r16 INTEGER (0..511), k5-r16 INTEGER (0..255)}, OPTIONAL -- condRefSRSOccasion

[0236] In an aspect, the above-noted flag “condRefSRSOCcasion” may indicate whether a reference UL-SRS-P occasion is reported.

[0237] FIG.17 illustrates an example implementation 1700 of the processes 1200-1400 of FIGS. 12-14, respectively, in accordance with aspects of the disclosure. At a high-level, the operations 1-13 are part of a well-known LPP procedure. However, in this case, some of the operations are modified so as to configure the Rx-Tx measurement window(s).

[0238] In particular, FIG.17 depicts two options for Rx-Tx measurement window configuration.

[0239] In a first option (i.e., a network or gNB implementation), operations 3-4 are modified, as follows: x Operation 3: In additional to gNB determination of UL-SRS-P resource, gNB also determines Rx-Tx measurement window(s), x Operation 4: gNB reports the determined Rx-Tx measurement window(s) in POSITIONING INFORMATION RESPONSE

[0240] In a second option (i.e., an LMF implementation using NRPPa transactions), operations 3-4 may be unmodified, and operation 6 may instead be modified such that LMF- determined Rx-Tx measurement window(s) are configured and sent by the LMF to the gNB(s). 68 QC2304396WOQualcomm Ref. No.2304396WO 69

[0241] Referring to FIGS. 12-14, in some designs, LMF may configure the serving gNB with a time-domain window w / PRS / SRS resources to be used for measurement / reporting (i.e., Rx-Tx measurement window). In some designs, gNB may forward the Rx-Tx measurement window to the UE, with specific pairs of PRS / SRS {PRS-i, SRS-j} being designated. In some designs, LMF may configure the UE a time-domain window w / PRS / SRS resources (i.e., Rx-Tx measurement window) to be used for measurement / reporting, with specific pairs of PRS / SRS {PRS-i, SRS-j} being designated.

[0242] Referring to FIGS. 12-14, in some designs, LMF may configure the serving gNB with a time-domain window w / PRS / SRS resources (i.e., Rx-Tx measurement window) to be used for measurement / reporting. In some designs, gNB forwards the Rx-Tx measurement window to the UE. In some designs, the gNB may further designate an SRS-ID and instruct the UE to report each hypothesis Rx-Tx with respect to that SRS-ID. In some designs, LMF may configure the UE with a time-domain window w / PRS / SRS resources (i.e., Rx-Tx measurement window) to be used for measurement / reporting. In some designs, LMF may further designate an SRS-ID and instruct the UE to report each hypothesis Rx-Tx with respect to that SRS-ID.

[0243] FIG.18 illustrates an exemplary process 1800 of communications according to an aspect of the disclosure. The process 1800 of FIG. 18 is performed by a UE, such as UE 302. The process 1800 is similar in some respects to the process 1200 of FIG. 12. However, the process 1800 is applicable to any reporting of Rx-Tx for two or more DL-PRS occasions per UL-SRS-P occasion for any scenario, irrespective of whether an Rx-Tx measurement window is used as in FIG.12.

[0244] Referring to FIG.18, at 1810, UE 302 (e.g., receiver 312 or 322, etc.) receives an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE. For example, the UL-SRS-P resource configuration may be received via RRC signaling. In some designs, UE 302 may only transmit on a subset of UL-SRS-P occasions, rather than each UL-SRS-P occasion in the subset of UL-SRS-P occasions.

[0245] Referring to FIG.18, at 1820, UE 302 (e.g., receiver 312 or 322, etc.) receives a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL- PRS occasions associated with the position estimation session of the UE. For example, the DL-PRS resource configuration may be received via RRC signaling. 69 QC2304396WOQualcomm Ref. No.2304396WO 70

[0246] Referring to FIG. 18, at 1830, UE 302 (e.g., receiver 312 or 322, processor(s) 332, Rx- Tx component 342, etc.), for at least one UL-SRS-P occasion configured by the UL-SRS- P resource configuration, determines a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS occasions.

[0247] Referring to FIG. 18, at 1840, UE 302 (e.g., transmitter 314 or 324, etc.) transmits a measurement report that comprises information sufficient to obtain the determined Rx- Tx measurement hypotheses.

[0248] Referring to FIG. 18, in some designs, the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL- SRS-P occasion.

[0249] Referring to FIG. 18, in some designs, the two or more DL-PRS occasions precede the UL-SRS-P occasion.

[0250] Referring to FIG.18, in some designs, the two or more DL-PRS occasions follow the UL- SRS-P occasion.

[0251] Referring to FIG.18, in some designs, at least one of the two or more DL-PRS occasions precedes the UL-SRS-P occasion, and at least one other of the two or more DL-PRS occasions follows the UL-SRS-P occasion.

[0252] In the detailed description above it can be seen that different features are grouped together in examples. This manner of disclosure should not be understood as an intention that the example clauses have more features than are explicitly mentioned in each clause. Rather, the various aspects of the disclosure may include fewer than all features of an individual example clause disclosed. Therefore, the following clauses should hereby be deemed to be incorporated in the description, wherein each clause by itself can stand as a separate example. Although each dependent clause can refer in the clauses to a specific combination with one of the other clauses, the aspect(s) of that dependent clause are not limited to the specific combination. It will be appreciated that other example clauses can also include a combination of the dependent clause aspect(s) with the subject matter of any other dependent clause or independent clause or a combination of any feature with other dependent and independent clauses. The various aspects disclosed herein expressly include these combinations, unless it is explicitly expressed or can be readily inferred that 70 QC2304396WOQualcomm Ref. No.2304396WO 71 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.

[0253] Implementation examples are described in the following numbered clauses:

[0254] Clause 1. A method of operating a user equipment (UE), comprising: receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receiving an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL- PRS occasion within the Rx-Tx measurement window; and transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0255] Clause 2. The method of clause 1, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL- PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

[0256] Clause 3. The method of any of clauses 1 to 2, wherein the indication of the Rx-Tx measurement window is received from a wireless network component via radio resource configuration (RRC) signaling.

[0257] Clause 4. The method of any of clauses 1 to 3, wherein the Rx-Tx measurement window is defined as a set of DL slots.

[0258] Clause 5. The method of any of clauses 1 to 4, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window. 71 QC2304396WOQualcomm Ref. No.2304396WO 72

[0259] Clause 6. The method of any of clauses 1 to 5, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0260] Clause 7. The method of clause 6, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0261] Clause 8. The method of any of clauses 1 to 7, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0262] Clause 9. The method of any of clauses 1 to 8, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0263] Clause 10. A method of operating a wireless network component, comprising: receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receiving an indication of a receive-transmit (Rx- Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and transmitting one or more indications of the Rx-Tx measurement window to one or more neighboring wireless network components.

[0264] Clause 11. The method of clause 10, wherein the one or more indications of the Rx-Tx measurement window is transmitted via backhaul signaling.

[0265] Clause 12. The method of any of clauses 10 to 11, wherein the Rx-Tx measurement window is defined as a set of DL slots. 72 QC2304396WOQualcomm Ref. No.2304396WO 73

[0266] Clause 13. The method of any of clauses 10 to 12, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0267] Clause 14. The method of any of clauses 10 to 13, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0268] Clause 15. The method of clause 14, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0269] Clause 16. The method of any of clauses 10 to 15, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0270] Clause 17. A method of operating a position estimation entity, comprising: transmitting an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); transmitting a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; transmitting an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and receiving a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and determining a position estimate of the UE based at least in part on the information.

[0271] Clause 18. The method of clause 17, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL- 73 QC2304396WOQualcomm Ref. No.2304396WO 74 PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

[0272] Clause 19. The method of any of clauses 17 to 18, wherein the indication of the Rx-Tx measurement window is transmitted from the UE and at least one wireless network component associated with the position estimation session of the UE.

[0273] Clause 20. The method of any of clauses 17 to 19, wherein the Rx-Tx measurement window is defined as a set of DL slots.

[0274] Clause 21. The method of any of clauses 17 to 20, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0275] Clause 22. The method of any of clauses 17 to 21, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0276] Clause 23. The method of clause 22, wherein the measurement report comprises Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0277] Clause 24. The method of any of clauses 17 to 23, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0278] Clause 25. The method of any of clauses 17 to 24, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0279] Clause 26. A method of operating a user equipment (UE), comprising: receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL- SRS-P resource configuration, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS 74 QC2304396WOQualcomm Ref. No.2304396WO 75 occasions ; and transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0280] Clause 27. The method of clause 26, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0281] Clause 28. The method of any of clauses 26 to 27, wherein the two or more DL-PRS occasions precede the UL-SRS-P occasion.

[0282] Clause 29. The method of any of clauses 26 to 28, wherein the two or more DL-PRS occasions follow the UL-SRS-P occasion.

[0283] Clause 30. The method of any of clauses 26 to 29, wherein at least one of the two or more DL-PRS occasions precedes the UL-SRS-P occasion, and wherein at least one other of the two or more DL-PRS occasions follows the UL-SRS-P occasion.

[0284] Clause 31. A user equipment (UE), comprising: a memory; and at least one processor communicatively coupled to the memory, the at least one processor configured to: receive an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receive an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL- PRS occasion within the Rx-Tx measurement window; and transmit a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0285] Clause 32. The UE of clause 31, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL- 75 QC2304396WOQualcomm Ref. No.2304396WO 76 PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

[0286] Clause 33. The UE of any of clauses 31 to 32, wherein the indication of the Rx-Tx measurement window is received from a wireless network component via radio resource configuration (RRC) signaling.

[0287] Clause 34. The UE of any of clauses 31 to 33, wherein the Rx-Tx measurement window is defined as a set of DL slots.

[0288] Clause 35. The UE of any of clauses 31 to 34, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0289] Clause 36. The UE of any of clauses 31 to 35, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0290] Clause 37. The UE of clause 36, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0291] Clause 38. The UE of any of clauses 31 to 37, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0292] Clause 39. The UE of any of clauses 31 to 38, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0293] Clause 40. A wireless network component, comprising: a memory; and at least one processor communicatively coupled to the memory, the at least one processor configured to: receive an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receive an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation 76 QC2304396WOQualcomm Ref. No.2304396WO 77 session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and transmit one or more indications of the Rx-Tx measurement window to one or more neighboring wireless network components.

[0294] Clause 41. The wireless network component of clause 40, wherein the one or more indications of the Rx-Tx measurement window is transmitted via backhaul signaling.

[0295] Clause 42. The wireless network component of any of clauses 40 to 41, wherein the Rx- Tx measurement window is defined as a set of DL slots.

[0296] Clause 43. The wireless network component of any of clauses 40 to 42, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL- SRS-P resource configuration within the Rx-Tx measurement window.

[0297] Clause 44. The wireless network component of any of clauses 40 to 43, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0298] Clause 45. The wireless network component of clause 44, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0299] Clause 46. The wireless network component of any of clauses 40 to 45, wherein the Rx- Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0300] Clause 47. A position estimation entity, comprising: a memory; and at least one processor communicatively coupled to the memory, the at least one processor configured to: transmit an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); transmit a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; transmit an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and 77 QC2304396WOQualcomm Ref. No.2304396WO 78 receive a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and determine a position estimate of the UE based at least in part on the information.

[0301] Clause 48. The position estimation entity of clause 47, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

[0302] Clause 49. The position estimation entity of any of clauses 47 to 48, wherein the indication of the Rx-Tx measurement window is transmitted from the UE and at least one wireless network component associated with the position estimation session of the UE.

[0303] Clause 50. The position estimation entity of any of clauses 47 to 49, wherein the Rx-Tx measurement window is defined as a set of DL slots.

[0304] Clause 51. The position estimation entity of any of clauses 47 to 50, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS- P resource configuration within the Rx-Tx measurement window.

[0305] Clause 52. The position estimation entity of any of clauses 47 to 51, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0306] Clause 53. The position estimation entity of clause 52, wherein the measurement report comprises Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0307] Clause 54. The position estimation entity of any of clauses 47 to 53, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion. 78 QC2304396WOQualcomm Ref. No.2304396WO 79

[0308] Clause 55. The position estimation entity of any of clauses 47 to 54, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0309] Clause 56. An UE, comprising: a memory; and at least one processor communicatively coupled to the memory, the at least one processor configured to: receive an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS occasions ; and transmit a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0310] Clause 57. The UE of clause 56, wherein the information to obtain the determined Rx- Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0311] Clause 58. The UE of any of clauses 56 to 57, wherein the two or more DL-PRS occasions precede the UL-SRS-P occasion.

[0312] Clause 59. The UE of any of clauses 56 to 58, wherein the two or more DL-PRS occasions follow the UL-SRS-P occasion.

[0313] Clause 60. The UE of any of clauses 56 to 59, wherein at least one of the two or more DL-PRS occasions precedes the UL-SRS-P occasion, and wherein at least one other of the two or more DL-PRS occasions follows the UL-SRS-P occasion.

[0314] Clause 61. A user equipment (UE), comprising: means for receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; means for receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; means for receiving an indication of a receive-transmit (Rx-Tx) measurement 79 QC2304396WOQualcomm Ref. No.2304396WO 80 window associated with the position estimation session of the UE; for at least one UL- SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and means for transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0315] Clause 62. The UE of clause 61, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL- PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

[0316] Clause 63. The UE of any of clauses 61 to 62, wherein the indication of the Rx-Tx measurement window is received from a wireless network component via radio resource configuration (RRC) signaling.

[0317] Clause 64. The UE of any of clauses 61 to 63, wherein the Rx-Tx measurement window is defined as a set of DL slots.

[0318] Clause 65. The UE of any of clauses 61 to 64, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0319] Clause 66. The UE of any of clauses 61 to 65, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0320] Clause 67. The UE of clause 66, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0321] Clause 68. The UE of any of clauses 61 to 67, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion. 80 QC2304396WOQualcomm Ref. No.2304396WO 81

[0322] Clause 69. The UE of any of clauses 61 to 68, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0323] Clause 70. A wireless network component, comprising: means for receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); means for receiving a downlink positioning reference signal (DL- PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; means for receiving an indication of a receive- transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and means for transmitting one or more indications of the Rx-Tx measurement window to one or more neighboring wireless network components.

[0324] Clause 71. The wireless network component of clause 70, wherein the one or more indications of the Rx-Tx measurement window is transmitted via backhaul signaling.

[0325] Clause 72. The wireless network component of any of clauses 70 to 71, wherein the Rx- Tx measurement window is defined as a set of DL slots.

[0326] Clause 73. The wireless network component of any of clauses 70 to 72, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL- SRS-P resource configuration within the Rx-Tx measurement window.

[0327] Clause 74. The wireless network component of any of clauses 70 to 73, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0328] Clause 75. The wireless network component of clause 74, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0329] Clause 76. The wireless network component of any of clauses 70 to 75, wherein the Rx- Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE. 81 QC2304396WOQualcomm Ref. No.2304396WO 82

[0330] Clause 77. A position estimation entity, comprising: means for transmitting an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); means for transmitting a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; means for transmitting an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and means for receiving a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and means for determining a position estimate of the UE based at least in part on the information.

[0331] Clause 78. The position estimation entity of clause 77, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

[0332] Clause 79. The position estimation entity of any of clauses 77 to 78, wherein the indication of the Rx-Tx measurement window is transmitted from the UE and at least one wireless network component associated with the position estimation session of the UE.

[0333] Clause 80. The position estimation entity of any of clauses 77 to 79, wherein the Rx-Tx measurement window is defined as a set of DL slots.

[0334] Clause 81. The position estimation entity of any of clauses 77 to 80, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS- P resource configuration within the Rx-Tx measurement window.

[0335] Clause 82. The position estimation entity of any of clauses 77 to 81, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window. 82 QC2304396WOQualcomm Ref. No.2304396WO 83

[0336] Clause 83. The position estimation entity of clause 82, wherein the measurement report comprises Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0337] Clause 84. The position estimation entity of any of clauses 77 to 83, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0338] Clause 85. The position estimation entity of any of clauses 77 to 84, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0339] Clause 86. An UE, comprising: means for receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; means for receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; means for, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS occasions ; and means for transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0340] Clause 87. The UE of clause 86, wherein the information to obtain the determined Rx- Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0341] Clause 88. The UE of any of clauses 86 to 87, wherein the two or more DL-PRS occasions precede the UL-SRS-P occasion.

[0342] Clause 89. The UE of any of clauses 86 to 88, wherein the two or more DL-PRS occasions follow the UL-SRS-P occasion. 83 QC2304396WOQualcomm Ref. No.2304396WO 84

[0343] Clause 90. The UE of any of clauses 86 to 89, wherein at least one of the two or more DL-PRS occasions precedes the UL-SRS-P occasion, and wherein at least one other of the two or more DL-PRS occasions follows the UL-SRS-P occasion.

[0344] Clause 91. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a user equipment (UE), cause the UE to: receive an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receive an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and transmit a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0345] Clause 92. The non-transitory computer-readable medium of clause 91, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS- P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

[0346] Clause 93. The non-transitory computer-readable medium of any of clauses 91 to 92, wherein the indication of the Rx-Tx measurement window is received from a wireless network component via radio resource configuration (RRC) signaling.

[0347] Clause 94. The non-transitory computer-readable medium of any of clauses 91 to 93, wherein the Rx-Tx measurement window is defined as a set of DL slots.

[0348] Clause 95. The non-transitory computer-readable medium of any of clauses 91 to 94, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0349] Clause 96. The non-transitory computer-readable medium of any of clauses 91 to 95, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions 84 QC2304396WOQualcomm Ref. No.2304396WO 85 configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0350] Clause 97. The non-transitory computer-readable medium of clause 96, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS- P occasion within the Rx-Tx measurement window.

[0351] Clause 98. The non-transitory computer-readable medium of any of clauses 91 to 97, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0352] Clause 99. The non-transitory computer-readable medium of any of clauses 91 to 98, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0353] Clause 100. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a wireless network component, cause the wireless network component to: receive an uplink sounding reference signal for positioning (UL- SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL- PRS occasions associated with the position estimation session of the UE; receive an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS- P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and transmit one or more indications of the Rx-Tx measurement window to one or more neighboring wireless network components.

[0354] Clause 101. The non-transitory computer-readable medium of clause 100, wherein the one or more indications of the Rx-Tx measurement window is transmitted via backhaul signaling.

[0355] Clause 102. The non-transitory computer-readable medium of any of clauses 100 to 101, wherein the Rx-Tx measurement window is defined as a set of DL slots. 85 QC2304396WOQualcomm Ref. No.2304396WO 86

[0356] Clause 103. The non-transitory computer-readable medium of any of clauses 100 to 102, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0357] Clause 104. The non-transitory computer-readable medium of any of clauses 100 to 103, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0358] Clause 105. The non-transitory computer-readable medium of clause 104, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL- SRS-P occasion within the Rx-Tx measurement window.

[0359] Clause 106. The non-transitory computer-readable medium of any of clauses 100 to 105, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0360] Clause 107. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a position estimation entity, cause the position estimation entity to: transmit an uplink sounding reference signal for positioning (UL- SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); transmit a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL- PRS occasions associated with the position estimation session of the UE; transmit an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL-SRS-P on at least one UL-SRS- P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and receive a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and determine a position estimate of the UE based at least in part on the information. 86 QC2304396WOQualcomm Ref. No.2304396WO 87

[0361] Clause 108. The non-transitory computer-readable medium of clause 107, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS- P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

[0362] Clause 109. The non-transitory computer-readable medium of any of clauses 107 to 108, wherein the indication of the Rx-Tx measurement window is transmitted from the UE and at least one wireless network component associated with the position estimation session of the UE.

[0363] Clause 110. The non-transitory computer-readable medium of any of clauses 107 to 109, wherein the Rx-Tx measurement window is defined as a set of DL slots.

[0364] Clause 111. The non-transitory computer-readable medium of any of clauses 107 to 110, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0365] Clause 112. The non-transitory computer-readable medium of any of clauses 107 to 111, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

[0366] Clause 113. The non-transitory computer-readable medium of clause 112, wherein the measurement report comprises Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

[0367] Clause 114. The non-transitory computer-readable medium of any of clauses 107 to 113, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0368] Clause 115. The non-transitory computer-readable medium of any of clauses 107 to 114, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

[0369] Clause 116. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by an UE, cause the UE to: receive an uplink sounding 87 QC2304396WOQualcomm Ref. No.2304396WO 88 reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receive a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS occasions ; and transmit a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

[0370] Clause 117. The non-transitory computer-readable medium of clause 116, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

[0371] Clause 118. The non-transitory computer-readable medium of any of clauses 116 to 117, wherein the two or more DL-PRS occasions precede the UL-SRS-P occasion.

[0372] Clause 119. The non-transitory computer-readable medium of any of clauses 116 to 118, wherein the two or more DL-PRS occasions follow the UL-SRS-P occasion.

[0373] Clause 120. The non-transitory computer-readable medium of any of clauses 116 to 119, wherein at least one of the two or more DL-PRS occasions precedes the UL-SRS-P occasion, and wherein at least one other of the two or more DL-PRS occasions follows the UL-SRS-P occasion.

[0374] Those of skill in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0375] 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 88 QC2304396WOQualcomm Ref. No.2304396WO 89 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.

[0376] 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.

[0377] 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 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.

[0378] In one or more example aspects, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, 89 QC2304396WOQualcomm Ref. No.2304396WO 90 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.

[0379] 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. 90 QC2304396WO

Claims

Qualcomm Ref. No.2304396WO 91 CLAIMS What is claimed is:

1. A method of operating a user equipment (UE), comprising: receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receiving an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL-PRS occasion within the Rx-Tx measurement window; and transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

2. The method of claim 1, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

3. The method of claim 1, wherein the indication of the Rx-Tx measurement window is received from a wireless network component via radio resource configuration (RRC) signaling. 91 QC2304396WOQualcomm Ref. No.2304396WO 92 4. The method of claim 1, wherein the Rx-Tx measurement window is defined as a set of DL slots.

5. The method of claim 1, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

6. The method of claim 1, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

7. The method of claim 6, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

8. The method of claim 1, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

9. The method of claim 1, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

10. A method of operating a wireless network component, comprising: receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); 92 QC2304396WOQualcomm Ref. No.2304396WO 93 receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; receiving an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL- SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and transmitting one or more indications of the Rx-Tx measurement window to one or more neighboring wireless network components.

11. The method of claim 10, wherein the one or more indications of the Rx- Tx measurement window is transmitted via backhaul signaling.

12. The method of claim 10, wherein the Rx-Tx measurement window is defined as a set of DL slots.

13. The method of claim 10, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

14. The method of claim 10, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

15. The method of claim 14, wherein the UE is instructed to report Rx-Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx-Tx measurement window.

16. The method of claim 10, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE. 93 QC2304396WOQualcomm Ref. No.2304396WO 94 17. A method of operating a position estimation entity, comprising: transmitting an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of a user equipment (UE); transmitting a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; transmitting an indication of a receive-transmit (Rx-Tx) measurement window associated with the position estimation session of the UE, wherein the Rx-Tx measurement window defines a time period where the UE is instructed to transmit UL- SRS-P on at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window; and receiving a measurement report from the UE that comprises sufficient information to obtain, for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window, a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and at least one DL- PRS occasion within the Rx-Tx measurement window; and determining a position estimate of the UE based at least in part on the information.

18. The method of claim 17, wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that precedes the UL-SRS-P occasion within the Rx-Tx measurement window, or wherein the at least one DL-PRS occasion comprises each DL-PRS occasion that follows the UL-SRS-P occasion within the Rx-Tx measurement window, or a combination thereof.

19. The method of claim 17, wherein the indication of the Rx-Tx measurement window is transmitted from the UE and at least one wireless network component associated with the position estimation session of the UE. 94 QC2304396WOQualcomm Ref. No.2304396WO 95 20. The method of claim 17, wherein the Rx-Tx measurement window is defined as a set of DL slots.

21. The method of claim 17, wherein the at least one UL-SRS-P occasion includes each UL-SRS-P occasion configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

22. The method of claim 17, wherein the at least one UL-SRS-P occasion includes less than all UL-SRS-P occasions configured by the UL-SRS-P resource configuration within the Rx-Tx measurement window.

23. The method of claim 22, wherein the measurement report comprises Rx- Tx measurement hypotheses for only the at least one UL-SRS-P occasion within the Rx- Tx measurement window.

24. The method of claim 17, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

25. The method of claim 17, wherein the Rx-Tx measurement window is one of a plurality of Rx-Tx measurement windows configured during the position estimation session of the UE.

26. A method of operating a user equipment (UE), comprising: receiving an uplink sounding reference signal for positioning (UL-SRS-P) resource configuration that configures a set of UL-SRS-P occasions associated with a position estimation session of the UE; 95 QC2304396WOQualcomm Ref. No.2304396WO 96 receiving a downlink positioning reference signal (DL-PRS) resource configuration that configures a set of DL-PRS occasions associated with the position estimation session of the UE; for at least one UL-SRS-P occasion configured by the UL-SRS-P resource configuration, determining a Rx-Tx measurement hypothesis associated with a time difference between the UL-SRS-P occasion and two or more DL-PRS occasions; and transmitting a measurement report that comprises information sufficient to obtain the determined Rx-Tx measurement hypotheses.

27. The method of claim 26, wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises the determined Rx-Tx measurement hypotheses, or wherein the information to obtain the determined Rx-Tx measurement hypotheses comprises a difference between the determined Rx-Tx measurement hypotheses and a reference UL-SRS-P occasion.

28. The method of claim 26, wherein the two or more DL-PRS occasions precede the UL-SRS-P occasion.

29. The method of claim 26, wherein the two or more DL-PRS occasions follow the UL-SRS-P occasion.

30. The method of claim 26, wherein at least one of the two or more DL-PRS occasions precedes the UL-SRS- P occasion, and wherein at least one other of the two or more DL-PRS occasions follows the UL- SRS-P occasion. 96 QC2304396WO

Images