Defining the association between PRS and SRS to improve multi-RTT positioning in throughput-constrained scenarios

Abstract

Aspects presented herein may enable a UE to indicate to a base station a list of PRS resources that the UE intends to measure at a given opportunity. In one aspect, the UE determines an association between one or more reception properties of one or more PRS resources and one or more transmission properties of one or more SRS resources. The UE transmits information to at least one serving BS indicating one or more PRS resources that the UE is configured to measure at future measurement occasions. The UE measures the PRS received from one or more BSs on the one or more PRS resources based on the one or more reception properties. The UE transmits the SRS on the one or more SRS resources based on the one or more transmission properties to the one or more BSs after measuring the PRS.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of Greek Patent Application No. 20210100258, filed April 14, 2021, entitled "DEFINING PRS & SRS ASSOCIATION TO IMPROVE MULTI-RTT POSITIONING IN PROCESSING CAPABILITY CONSTRAINED SCENARIOS," the entire contents of which are expressly incorporated herein by reference.

[0002]

[0002] The present disclosure relates generally to communication systems, and more particularly, to wireless communications with positioning. [Background technology]

[0003] Introduction

[0003] Wireless communication systems have been widely deployed to provide various telecommunication services, such as telephone, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems.

[0004]

[0004] These multiple access technologies are adopted in various telecommunication standards to provide a common protocol that allows different wireless devices to communicate on a city, national, regional, or even global scale. An exemplary telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuing mobile broadband evolution promulgated by the 3rd Generation Partnership Project (3GPP®) to meet new requirements related to latency, reliability, security, scalability (e.g., for the Internet of Things (IoT)), and other requirements. 5G NR includes services related to enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE®) standard. Further improvements of 5G NR technology are necessary. These improvements may also be applicable to other multiple access technologies and telecommunication standards that adopt these technologies. Summary of the Invention

[0005]

[0005] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an exhaustive overview of all contemplated aspects, nor is it intended to identify key or critical elements of all aspects or to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0006]

[0006] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication in a user equipment (UE). The apparatus determines an association between one or more reception properties of one or more positioning reference signal (PRS) resources and one or more transmission properties of one or more sounding reference signal (SRS) resources. The apparatus transmits information to at least one serving base station (BS) indicating one or more PRS resources that the UE is configured to measure in a future measurement occasion. The apparatus measures a PRS received from one or more BSs on the one or more PRS resources based on the one or more reception properties. The apparatus transmits an SRS on one or more SRS resources based on the one or more transmission properties to one or more BSs after measuring the PRS.

[0007]

[0007] In one aspect of the disclosure, a method, a computer-readable medium, and an apparatus for wireless communication in a base station are provided. The apparatus receives information from a UE indicating one or more PRS resources that the UE is configured to measure or has measured in one measurement occasion. The apparatus transmits a PRS on the indicated one or more PRS resources based on one or more transmission properties. The apparatus receives an SRS from the UE after transmitting the PRS on one or more SRS resources based on one or more reception properties associated with the one or more transmission properties. The apparatus measures the received SRS on one or more SRS resources corresponding to the indicated one or more PRS resources.

[0008]

[0008] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus for wireless communication in a UE are provided. The apparatus receives information indicating one or more SRS resources or one or more PRS resources corresponding to the one or more SRS resources from at least one serving BS, where the one or more SRS resources are associated with one or more transmission properties. The apparatus transmits an SRS to one or more BSs based on the one or more transmission properties, where the SRS is transmitted on the indicated one or more SRS resources or on one or more SRS resources corresponding to the indicated one or more PRS resources. After transmitting the SRS, the apparatus prioritizes measuring a PRS received from at least one BS on one or more PRS resources in one measurement occasion, where the PRS is received based on one or more reception properties associated with the one or more transmission properties.

[0009]

[0009] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus for wireless communication in a base station are provided. The apparatus measures an SRS received from a UE on one or more SRS resources at a measurement occasion. The apparatus determines a subset of the one or more SRS resources, where the subset of the SRS resources corresponds to one or more reception properties at the BS. The apparatus transmits a PRS to the UE on one or more PRS resources based on one or more transmission properties at the BS, where the one or more PRS resources correspond to the determined subset of SRS resources, where the one or more transmission properties are associated with the one or more reception properties.

[0010]

[0010] To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of the various aspects may be employed, and the description is intended to include all such aspects and their equivalents. [Brief description of the drawings]

[0011] [Figure 1]

[0011] FIG. 1 illustrates an example of a wireless communication system and access network according to aspects presented herein. [Figure 2A]

[0012] FIG. 2 illustrates an example of a first frame, according to various aspects of the present disclosure. [Figure 2B]

[0013] FIG. 2 illustrates an example of a downlink (DL) channel in a subframe, in accordance with various aspects of the present disclosure. [Figure 2C]

[0014] FIG. 13 illustrates an example of a second frame, according to various aspects of the present disclosure. [Figure 2D]

[0015] FIG. 2 illustrates an example of an uplink (UL) channel in a subframe, in accordance with various aspects of the present disclosure. [Diagram 3]

[0016] FIG. 2 illustrates an example of a base station and a UE in an access network. [Figure 4]

[0017] FIG. 2 illustrates an example of UE positioning based on reference signal measurements. [Figure 5A]

[0018] FIG. 13 is a diagram showing an example of DL-PRS transmitted from multiple TRPs. [Figure 5B] FIG. 13 is a diagram showing an example of a UL-SRS transmitted from a UE. [Figure 6]

[0019] FIG. 1 illustrates an example of estimating a UE's location based on multi-RTT measurements from multiple TRPs or base stations. [Figure 7]

[0020] 1 illustrates a communication flow of an example of a UE communicating with a base station regarding DL-PRS resources to be measured, according to an aspect of the disclosure. [Figure 8]

[0021] 1 illustrates a communication flow of an example of a UE communicating with multiple base stations regarding DL-PRS resources to be measured, according to an aspect of the disclosure. [Figure 9]

[0022] 11 illustrates a communication flow of an example of a base station indicating a list of UL-SRSs to a UE for the UE to prioritize measurements of corresponding DL-PRSs, according to an aspect of the disclosure. [Figure 10]

[0023] 1 illustrates an example of a base station determining a list of UL-SRS resources on which a UE may prioritize measurements of its DL-PRS based on previous measurement instances. [Figure 11]

[0024] 1 is a flowchart of a method of wireless communication according to an aspect presented herein. [Figure 12]

[0025] FIG. 2 illustrates an example of a hardware implementation for an exemplary apparatus according to aspects presented herein. [Figure 13]

[0026] 1 is a flowchart of a method of wireless communication according to an aspect presented herein. [Figure 14]

[0027] FIG. 2 illustrates an example of a hardware implementation for an exemplary apparatus according to aspects presented herein. [Figure 15]

[0028] 1 is a flowchart of a method of wireless communication according to an aspect presented herein. [Figure 16]

[0029] FIG. 2 illustrates an example of a hardware implementation for an exemplary apparatus according to aspects presented herein. [Figure 17]

[0030] 1 is a flowchart of a method of wireless communication according to an aspect presented herein. [Figure 18]

[0031] FIG. 2 illustrates an example of a hardware implementation for an exemplary apparatus according to aspects presented herein. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012]

[0032] The detailed description of the invention described below with reference to the accompanying drawings is intended as an illustration of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description of the invention includes specific details to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some cases, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0013]

[0033] Several aspects of a telecommunications system are now presented with respect to various apparatus and methods that are described in the detailed description that follows and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0014]

[0034] As an example, an element, or any portion of an element, or any combination of elements, may be implemented as a "processing system" including one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chips (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gate logic, discrete hardware circuits, and other suitable hardware configured to perform various functions described throughout this disclosure. One or more processors in a processing system may execute software. Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, and the like, regardless of whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0015]

[0035] Thus, in one or more exemplary embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on a computer-readable medium or encoded as one or more instructions or codes on the computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available medium that can be accessed by a computer. By way of example and not limitation, such computer-readable media may comprise random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the above types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

[0016]

[0036] 1 illustrates an example of a wireless communication system and access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes a base station 102, a UE 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., 5G core (5GC)). The base station 102 may include macro cells (high power cellular base stations) and / or small cells (low power cellular base stations). The macro cells include base stations. The small cells include femto cells, pico cells, and micro cells.

[0017]

[0037] Aspects presented herein may improve positioning based on multi-RTT measurements for UEs and base stations. Aspects presented herein may enable the base station / LMF and the UE to communicate with each other to prioritize measurements for DL-PRS and / or UL-SRS resources, so that the correct pair of DL-PRS / UL-SRS resources can be measured by the UE and base station to improve performance and accuracy of positioning based on multi-RTT measurements.

[0018]

[0038] In some aspects, the UE 104 may include a PRS / SRS process component 198 configured to indicate to the base station a list of PRS resources that the UE plans to measure at a given occasion and / or receive from the base station a list of SRS resources on which the UE may prioritize measurements of its PRS based at least in part on the list. In one configuration, the PRS / SRS process component 198 may be configured to determine an association between one or more reception properties of one or more PRS resources and one or more transmission properties of one or more SRS resources. In such a configuration, the PRS / SRS process component 198 may transmit information to at least one serving BS indicating one or more PRS resources that the UE is configured to measure at a future measurement occasion. In such a configuration, the PRS / SRS process component 198 may measure a PRS received from one or more BSs on one or more PRS resources based on one or more reception properties. In such a configuration, the PRS / SRS process component 198 may transmit an SRS on one or more SRS resources based on one or more transmission properties to one or more BSs after measuring the PRS. In another configuration, the PRS / SRS process component 198 may be configured to receive information from at least one serving BS indicating one or more SRS resources or one or more PRS resources corresponding to the one or more SRS resources, the one or more SRS resources being associated with one or more transmission properties. In such a configuration, the PRS / SRS process component 198 may transmit an SRS to the one or more BSs based on the one or more transmission properties, the SRS being transmitted on the indicated one or more SRS resources or on one or more SRS resources corresponding to the indicated one or more PRS resources.In such a configuration, the PRS / SRS process component 198 may prioritize measuring a PRS received from at least one BS on one or more PRS resources in a measurement occasion after transmitting an SRS, the PRS being received based on one or more receive properties associated with the one or more transmit properties.

[0019]

[0039] In some aspects, the base station 102 / 180 may include a PRS / SRS configuration component 199 configured to receive from the UE a list of PRS resources that the UE plans to measure at a given occasion and / or to indicate to the UE a list on which the UE may prioritize measurements of its PRS based at least in part on the list of SRS resources. In one configuration, the PRS / SRS configuration component 199 may be configured to receive from the UE information indicating one or more PRS resources that the UE is configured to measure or has measured at a measurement occasion. In such a configuration, the PRS / SRS configuration component 199 may transmit a PRS on the indicated one or more PRS resources based on one or more transmission properties. In such a configuration, the PRS / SRS configuration component 199 may receive an SRS from the UE after transmitting the PRS on one or more SRS resources based on one or more reception properties associated with the one or more transmission properties. In such a configuration, the PRS / SRS configuration component 199 may measure the received SRS on one or more SRS resources corresponding to the indicated one or more PRS resources. In another configuration, the PRS / SRS configuration component 199 may be configured to measure an SRS received from a UE on one or more SRS resources at a measurement occasion. In such a configuration, the PRS / SRS configuration component 199 may determine a subset of the SRS resources of the one or more SRS resources, the subset of the SRS resources corresponding to one or more reception properties at the BS. In such a configuration, the PRS / SRS configuration component 199 may transmit a PRS to the UE on one or more PRS resources based on one or more transmission properties at the BS, the one or more PRS resources corresponding to the determined subset of SRS resources, the one or more transmission properties being associated with the one or more reception properties.

[0020]

[0040] A base station 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 through a first backhaul link 132 (e.g., an S1 interface). A base station 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with the core network 190 through a second backhaul link 184. In addition to other functions, the base stations 102 may perform one or more of the following functions: forwarding of user data, radio channel encryption and decryption, 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, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment tracing, RAN information management (RIM), paging, positioning, and distribution of alert messages. The base stations 102 may communicate with each other directly or indirectly (e.g., through the EPC 160 or the core network 190) over the third backhaul link 134 (e.g., an X2 interface). The first backhaul link 132, the second backhaul link 184, and the third backhaul link 134 may be wired or wireless.

[0021]

[0041] The base stations 102 may wirelessly communicate with the UE 104. Each of the base stations 102 may provide communication coverage to a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, a small cell 102' may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network including both small cells and macro cells may be known as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB) that may serve a closed group known as a closed subscriber group (CSG). A communication link 120 between the base station 102 and the UE 104 may include uplink (UL) transmissions (also referred to as a reverse link) from the UE 104 to the base station 102, and / or downlink (DL) transmissions (also referred to as a forward link) from the base station 102 to the UE 104. The communication link 120 may use multiple-input multiple-output (MIMO) antenna techniques, including spatial multiplexing, beamforming, and / or transmit diversity. The communication link may be through one or more carriers. The base station 102 / UE 104 may use spectrum with up to Y MHz (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.) bandwidth per carrier allocated in a carrier aggregation with up to Yx MHz total (x component carriers) used for transmission in each direction. The carriers may be adjacent or non-adjacent to each other. The carrier allocation may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL ​​than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

[0022]

[0042] Several UEs 104 may communicate with each other using device-to-device (D2D) communication links 158. The D2D communication links 158 may use DL / UL WWAN spectrum. The D2D communication links 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). The D2D communication may be through various wireless D2D communication systems, such as, for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0023]

[0043] The wireless communication system may further include a Wi-Fi access point (AP) 150 in communication with a Wi-Fi station (STA) 152 via a communication link 154, such as in the 5 GHz unlicensed frequency spectrum. When communicating in the unlicensed frequency spectrum, the STA 152 / AP 150 may perform clear channel assessment (CCA) prior to communicating to determine if a channel is available.

[0024]

[0044] The small cell 102' may operate in licensed and / or unlicensed frequency spectrums. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same unlicensed frequency spectrum (e.g., 5 GHz, etc.) used by the Wi-Fi AP 150. A small cell 102' employing NR in an unlicensed frequency spectrum may enhance coverage to and / or increase capacity of an access network.

[0025]

[0045] The electromagnetic spectrum is often subdivided into various classes, bands, channels, etc. based on frequency / wavelength. In 5G NR, the two initial operating bands are identified as frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). Frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as the "sub-6 GHz" band in various documents and papers. A similar naming issue sometimes occurs with FR2, which is often referred to (interchangeably) as the "millimeter wave" band in documents and papers, even though FR2 is different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) identified as the "millimeter wave" band by the International Telecommunications Union (ITU).

[0026]

[0046] With the above aspects in mind, it should be understood that unless otherwise specified, terms such as "sub-6 GHz," as used herein, may broadly refer to frequencies that may be below 6 GHz, may be within FR1, or may include mid-band frequencies. Additionally, it should be understood that unless otherwise specified, terms such as "millimeter wave," as used herein, may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.

[0027]

[0047] The base station 102, whether a small cell 102′ or a large cell (e.g., a macro base station), may include and / or be referred to as an eNB, g Node B (gNB), or another type of base station. Some base stations, such as the gNB 180, may operate in a conventional sub-6 GHz spectrum, in millimeter wave frequencies, and / or at near millimeter wave frequencies in communication with the UE 104. When the gNB 180 operates at millimeter wave or near millimeter wave frequencies, the gNB 180 may be referred to as a millimeter wave base station. The millimeter wave base station 180 may utilize beamforming 182 with the UE 104 to compensate for path loss and short range. The base station 180 and the UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to enable beamforming.

[0028]

[0048] The base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182′. The UE 104 may receive a beamformed signal from the base station 180 in one or more receive directions 182″. The UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions. The base station 180 may receive a beamformed signal from the UE 104 in one or more receive directions. The base station 180 / UE 104 may perform beam training to determine the best receive direction and transmit direction for each of the base station 180 / UE 104. The transmit and receive directions for the base station 180 may be the same or different. The transmit and receive directions for the UE 104 may be the same or different.

[0029]

[0049] The EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be in communication with a Home Subscriber Server (HSS) 174. The MME 162 is a control node that handles signaling () between the UE 104 and the EPC 160. In general, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are forwarded through the Serving Gateway 166, which is itself connected to the PDN Gateway 172. The PDN Gateway 172 provides IP address allocation for the UE as well as other functions. The PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176. The IP services 176 may include Internet, intranet, IP Multimedia Subsystem (IMS), PS streaming services, and / or other IP services. The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may act as an entry point for content provider MBMS transmissions, may be used to authorize and start MBMS bearer services in a Public Land Mobile Network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to deliver MBMS traffic to base stations 102 that belong to a Multicast Broadcast Single Frequency Network (MBSFN) area that broadcasts a particular service, and may be responsible for session management (start / stop) and collecting eMBMS-related charging information.

[0030]

[0050] The core network 190 may include an access and mobility management function (AMF) 192, another AMF 193, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 may be in communication with an integrated data management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are forwarded through the UPF 195. The UPF 195 provides IP address allocation for the UE as well as other functions. The UPF 195 is connected to IP services 197. The IP services 197 may include the Internet, intranet, IP multimedia subsystem (IMS), packet switched (PS) streaming (PSS) services, and / or other IP services.

[0031]

[0051] A base station may include and / or be referred to as a gNB, Node B, eNB, access point, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmit reception point (TRP), or some other suitable terminology. The base station 102 provides an access point to the EPC 160 or core network 190 for the UE 104. Examples of the UE 104 include a cellular phone, a smartphone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, or any other similar function device. Some of the UEs 104 may be referred to as IoT devices (e.g., a parking meter, a gas pump, a toaster, a vehicle, a heart monitor, etc.). The UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0032]

[0052] FIG. 2A is a diagram 200 illustrating an example of a first subframe in a 5G NR frame structure. FIG. 2B is a diagram 230 illustrating an example of a DL channel in a 5G NR subframe. FIG. 2C is a diagram 250 illustrating an example of a second subframe in a 5G NR frame structure. FIG. 2D is a diagram 280 illustrating an example of a UL channel in a 5G NR subframe. The 5G NR frame structure may be frequency division duplex (FDD) where for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated to either DL or UL, or may be time division duplex (TDD) where for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated to both DL and UL. In the example provided by FIG. 2A, FIG. 2C, the 5G NR frame structure is assumed to be TDD, subframe 4 is configured with slot format 28 (mostly DL), where D is DL, U is UL, and F is flexible for use between DL / UL, and subframe 3 is configured with slot format 1 (all UL). Although subframes 3 and 4 are shown with slot formats 1 and 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are all DL and UL, respectively. The other slot formats 2-61 include a mix of DL, UL, and flexible symbols. The UE is configured with the slot format through a received slot format indicator (SFI) (either dynamically through DL control information (DCI) or semi-statically / statically through radio resource control (RRC) signaling). Note that the following description also applies to the 5G NR frame structure, which is TDD.

[0033]

[0053] Other wireless communication technologies may have different frame structures and / or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. A subframe may also include a minislot, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. Symbols on the DL may be Cyclic Prefix (CP) OFDM (CP-OFDM) symbols. Symbols on the UL may be CP-OFDM symbols (for high throughput scenarios) or Discrete Fourier Transform (DFT) Spread OFDM (DFT-s-OFDM) symbols (also called Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols) (for power-limited scenarios limited to a single stream transmission). The number of slots in a subframe is based on the slot configuration and the numerology. For slot configuration 0, the different numerologies μ0-4 allow for 1, 2, 4, 8, and 16 slots per subframe, respectively. For slot configuration 1, the different numerologies 0-2 allow for 2, 4, and 8 slots per subframe, respectively. Thus, for slot configuration 0 and numerology μ, 14 symbols / slot and 2 μ There are slots / subframes. Subcarrier spacing and symbol length / duration are functions of numerology. Subcarrier spacing is 2 μ*15 kHz, where μ is the numerology 0-4. Thus, numerology μ=0 has a subcarrier spacing of 15 kHz, and numerology μ=4 has a subcarrier spacing of 240 kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A-2D provide an example of slot configuration 0 with 14 symbols per slot and numerology μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs. Within a set of frames, there may be one or more different bandwidth parts (BWPs) (see Figure 2B) that are frequency division multiplexed. Each BWP may have a specific numerology.

[0034]

[0054] A resource grid can be used to represent the frame structure. Each time slot contains a physical resource block (RB), also called PRB, which spans 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0035]

[0055] As shown in Figure 2A, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include a demodulation RS (DM-RS) (shown as R for one particular configuration, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0036]

[0056] FIG. 2B illustrates an example of various DL channels in a subframe of a frame. A physical downlink control channel (PDCCH) carries DCI in one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including 6 RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. The PDCCHs in one BWP may be referred to as a control resource set (CORESET). A UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., common search space, UE-specific search space) during a PDCCH monitoring opportunity on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at higher and / or lower frequencies across the channel bandwidth. A primary synchronization signal (PSS) may be in symbol 2 of a particular subframe of a frame. The PSS is used by the UE 104 to determine subframe / symbol timing and physical layer identity. The secondary synchronization signal (SSS) may be in symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the 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 the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the DM-RS mentioned above. The physical broadcast channel (PBCH), which carries the master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also called SS block (SSB)). The MIB provides the number of RBs in the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data and broadcast system information not transmitted through the PBCH, such as the system information block (SIB), and paging messages.

[0037]

[0057] As shown in FIG. 2C, some of the REs carry DM-RS (denoted as R for one particular configuration, although other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether a short or long PUCCH is transmitted and depending on the particular PUCCH format used. The UE may transmit a sounding reference signal (SRS). The SRS may be transmitted in the last symbol of a subframe. The SRS may have a comb structure, and the UE may transmit the SRS on one of the combs. The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0038]

[0058] 2D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as shown in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicators (CQI), precoding matrix indicators (PMI), rank indicators (RI), and hybrid automatic repeat request (HARQ) ACK / NACK feedback. The PUSCH carries data and may be further used to carry buffer status reports (BSR), power headroom reports (PHR), and / or UCI.

[0039]

[0059] 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from the EPC 160 may be provided to a controller / processor 375. The controller / processor 375 implements Layer 3 and Layer 2 functions. Layer 3 includes a radio resource control (RRC) layer, and Layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller / processor 375 controls RRC layer functions related to broadcasting of system information (e.g., MIBs, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-Radio Access Technology (RAT) mobility, and measurement configuration for UE measurement reporting, as well as PDCP layer functions related to header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions, as well as RLC layer functions related to transfer of upper layer packet data units (PDUs), error correction via ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs, as well as mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) and MAC SDUs from the TBs. It provides MAC layer functions related to demultiplexing of SDUs, scheduling information reporting, error correction via HARQ, priority handling, and logical channel prioritization.

[0040]

[0060] The transmit (TX) processor 316 and receive (RX) processor 370 implement Layer 1 functions related to various signal processing functions. Layer 1, which includes the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) coding / decoding of the transport channel, interleaving, rate matching, mapping onto the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 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), multi-level quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to OFDM subcarriers, multiplexed with a reference signal (e.g., pilot) in the time domain and / or frequency domain, and then combined with each other using an inverse fast Fourier transform (IFFT) to generate a physical channel carrying a time-domain OFDM symbol stream. The OFDM streams are spatially precoded to generate multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme as well as for spatial processing. The channel estimates may be derived from a reference signal and / or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.

[0041]

[0061] At the UE 350, each receiver 354RX receives a signal through its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement Layer 1 functions related to various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal 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 point transmitted by the base station 310. These soft decisions may be based on channel estimates calculated by a channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to a controller / processor 359, which implements Layer 3 and Layer 2 functions.

[0042]

[0062] The controller / processor 359 may be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller / processor 359 performs demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0043]

[0063] Similar to the functions described with respect to DL transmission by base station 310, the controller / processor 359 provides RRC layer functions related to system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting, as well as PDCP layer functions related to header compression / decompression and security (encryption, decryption, integrity protection, integrity verification), as well as RLC layer functions related to transfer of upper layer PDUs, error correction via ARQ, concatenation, segmentation, and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs, as well as MAC layer functions related to mapping between logical channels and transport channels, multiplexing and demultiplexing of MAC SDUs onto and from the TB, scheduling information reporting, error correction via HARQ, priority handling, and logical channel prioritization.

[0044]

[0064] Channel estimates derived by the channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select an appropriate coding and modulation scheme and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.

[0045]

[0065] The UL transmission is processed at the base station 310 in a manner similar to that described for the receiver functions at the UE 350. Each receiver 318RX receives a signal via its respective antenna 320. Each receiver 318RX recovers the information modulated onto the RF carrier and provides the information to the RX processor 370.

[0046]

[0066] The controller / processor 375 may be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 performs demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0047]

[0067] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to implement aspects related to the PRS / SRS process component 198 of FIG.

[0048]

[0068] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to implement aspects related to the PRS / SRS component 199 of FIG.

[0049]

[0069] The location of the UE may be estimated based on measuring reference signals transmitted between the UE and one or more base stations and / or one or more transmit reception points (TRPs) of the base stations. FIG. 4 is a diagram 400 illustrating an example of positioning of a UE based on measurements of reference signals. In one example, the location of the UE 404 may be estimated based on multi-cell round trip time (multi-RTT) measurements, where multiple base stations 402 may perform round trip time (RTT) measurements for signals transmitted to and received from the UE 404 to determine an approximate distance of the UE 404 to each of the multiple base stations 402. Similarly, the UE 404 may perform RTT measurements for signals transmitted to and received from the base stations 402 to determine an approximate distance of each base station to the UE 404. Then, based at least in part on the approximate distances of the UE 404 to the multiple base stations 402, a location management function (LMF) associated with the base station 402 and / or the UE 404 may estimate the location of the UE 404. For example, the base station 406 may transmit at least one downlink positioning reference signal (DL-PRS) 410 to the UE 404 and may receive at least one uplink sounding reference signal (UL-SRS) 412 transmitted from the UE 404. Based at least in part on measuring the RTT 414 between the transmitted DL-PRS 410 and the received UL-SRS 412, the base station 406 or an LMF associated with the base station 406 may identify a position (e.g., distance) of the UE 404 relative to the base station 406. Similarly, the UE 404 may transmit the UL-SRS 412 to the base station 406 and may receive the DL-PRS 410 transmitted from the base station 406. Based at least in part on measuring the RTT 414 between the transmitted UL-SRS 412 and the received DL-PRS 410, the UE 404 or an LMF associated with the UE 404 may identify a position of the base station 406 relative to the UE 404. The multi-RTT measurement mechanism may be initiated by the base station 406 / 408 and / or the LMF associated with the UE 404. The base station may configure the UE with UL-SRS resources via radio resource control (RRC) signaling.In some examples, the UE and the base station (or the TRP of the base station) may report multi-RTT measurements to the LMF, and the LMF may estimate the location of the UE based on the reported multi-RTT measurements.

[0050]

[0070] In other examples, the UE's location may be estimated based on measurements of multiple antenna beams, where downlink angle of departure (DL-AoD) and / or uplink angle of arrival (UL-AoA) of transmissions between the UE and one or more base stations / TRPs may be used to estimate the UE's location and / or distance with respect to each base station / TRP. For example, referring again to FIG. 4, for DL-AoD, the UE 404 may perform measurements of reference signal received power (RSRP) for a set of DL-PRS 416 transmitted from multiple transmission beams (e.g., DL-PRS beams) of the base station 408, and the UE 404 may provide the measurements of the DL-PRS beams to the serving base station (or to an LMF associated with the base station). Based on the measurements of the DL-PRS beams, the serving base station or the LMF may derive an azimuth angle of departure (e.g., Φ) and a zenith angle of departure (e.g., θ) for the DL-PRS beams of the base station 408. The serving base station or LMF may then estimate the position of the UE 404 relative to the base station 408 based on the departure azimuth angle and departure zenith angle of the DL-PRS beam. Similarly, in the case of UL-AoA, the position of the UE may be estimated based on measurements of the UL-SRS beam measured at a different base station, such as at the base station 402. Based on the measurements of the UL-SRS beam, the serving base station or an LMF associated with the serving base station may derive an azimuth angle of arrival and a zenith angle of arrival for the UL-SRS beam from the UE, and the serving base station or LMF may estimate the position of the UE and / or the distance of the UE relative to each of the base stations based on the azimuth angle of arrival and the zenith angle of arrival of the UL-SRS beam.

[0051]

[0071] FIG. 5A is a diagram 500A illustrating an example of DL-PRS transmitted from multiple TRPs / base stations. In one example, the serving base station may configure the DL-PRS to be transmitted from one or more TRPs / base stations within a slot or across multiple slots. If the DL-PRS is configured to be transmitted within a slot, the serving base station may configure the starting resource element in time and frequency from each of the one or more TRPs / base stations. If the DL-PRS is configured to be transmitted across multiple slots, the serving base station may configure the gap between DL-PRS slots in a period, the periodicity of the DL-PRS, and / or the density of the DL-PRS. The serving base station may also configure the DL-PRS to start at any physical resource block (PRB) in the system bandwidth. In one example, the system bandwidth may range from 24 to 276 PRBs in steps of four PRBs (e.g., 24, 28, 32, 36, etc.). A serving base station may transmit DL-PRS in a PRS beam, where a PRS beam may be referred to as a "PRS resource" and the entire set of PRS beams transmitted from a TRP on the same frequency may be referred to as a "PRS resource set" or a "resource set of PRS," as described with respect to Figure 4. As shown by Figure 5A, DL-PRS transmitted from different TRPs and / or from different PRS beams may be multiplexed across symbols or slots.

[0052]

[0072] In some examples, the accuracy of the UE's positioning may also increase when more RTT and / or angle measurements (e.g., azimuth angle and zenith angle measurements) based on DL-PRS are collected (e.g., by the LMF through the base station and / or the UE). Because DL-PRS measurements may be collected for each PRS resource, repeated transmissions of PRS resources from the TRP / base station may enable more DL-PRS measurements and / or continuous measurements of DL-PRS at the UE. The serving base station may determine gaps between PRS resources (e.g.,

[0053]

number

[0054] ) and configure the duration of the resource set (for example,

[0055]

number

[0056] ) the number of repetitions of the resource within the

[0057]

number

[0058] ) for the UE. For example, the serving base station may configure the DL-PRS resources to repeat up to 32 times within the resource set period with a configurable gap between repetitions, or in consecutive slots. The serving base station may also configure the resource set period (e.g., dl-PRS-Periodicity-and-ResourceSetSlotOffset-r16 parameters) for the UE, which may range from 4 to 10240 milliseconds.

[0059]

number

[0060] ) and 0

[0061]

number

[0062] The possible slot offsets range from

[0063]

number

[0064] ) may be configured. Based on the configuration, the number of measurements of DL-PRS that the UE may be able to perform during a period or duration may be estimated. For example, for a subcarrier spacing of 30 kHz, the minimum measurement instance period may be 8 slots, which may equal 4 ms. If the minimum reporting period is configured to be 1 s (e.g., 1000 ms), the UE may have up to 250 measurement instances (e.g., 1000 / 4) to perform measurements of DL-PRS.

[0065]

[0073] In some examples, the base station may configure or request the UE to provide periodic location information reports. The base station may indicate to the UE (e.g., via the reportingAmount parameter) the number of periodic location information reports requested by the base station, which may be 2, 4, 8, 16, 32, 64, 128, or an infinite / indefinite number of reports. If the base station requests the UE to provide an infinite / indefinite number of reports (e.g., reportingAmount=indefinite / indefinite), the UE may continue to provide periodic location information reports until the base station informs the UE to stop, such as by sending an abort message to the UE. The base station may also indicate to the UE a time interval between location information reports transmitted from the UE and a response time for a first location information report, where the time interval may be 1, 2, 4, 8, 10, 16, 20, 32, 64, and / or 128 seconds.

[0066]

[0074] Referring again to FIG. 5A, each symbol of the DL-PRS may be arranged in a comb structure in frequency, where a DL-PRS from a base station or TRP may occupy every Nth subcarrier. The comb value N may be configured to be 2, 4, 6, or 12. The length of the PRS in one slot may be a multiple of N symbols, and the position of the first symbol in the slot may be flexible as long as the slot consists of at least N PRS symbols. FIG. 500A is an example of a comb 6 DL-PRS arrangement, where the pattern for DL-PRS from different TRPs / base stations may be repeated after six symbols.

[0067]

[0075] FIG. 5B is a diagram 500B illustrating an example of a UL-SRS transmitted from a UE. In one example, the UL-SRS from the UE may be configured in a comb-of-four pattern, where the pattern for the UL-SRS may be repeated after four symbols. Similarly, the UL-SRS may be configured in SRS resources of an SRS resource set, where each SRS resource may correspond to an SRS beam, and the SRS resource set may correspond to a collection of SRS resources (e.g., beams) configured for the base station / TRP. In some examples, the SRS resources may span 1, 2, 4, 8, or 12 consecutive OFDM symbols. In other examples, the comb size for the UL-SRS may be configured to be 2, 4, or 8.

[0068]

[0076] 6 is a diagram 600 illustrating an example of estimating a UE's location based on multiple RTT measurements from multiple base stations or TRPs. The UE 602 may be configured by a serving base station to decode DL-PRS resources 612 corresponding to and transmitted from a first base station (BS) 604, a second BS 606, a third BS 608, and a fourth BS 610. The UE 602 may also be configured to transmit UL-SRS on a set of UL-SRS resources, which may include a first SRS resource 614, a second SRS resource 616, a third SRS resource 618, and a fourth SRS resource 620, such that the serving cells, e.g., the first BS 604, the second BS 606, the third BS 608, and the fourth BS 610, as well as other neighbor cells, may be able to measure the set of UL-SRS resources transmitted from the UE 602. In the case of multi-RTT measurements based on DL-PRS and UL-SRS, there may be an association between the UE's measurements for DL-PRS and the base station's measurements for UL-SRS, so the smaller the gap between the UE's measurements of DL-PRS and the UE's transmission of UL-SRS, the better the accuracy of the estimation of the UE's position and / or distance to each BS may be.

[0069]

[0077] In some examples, due to the processing capabilities and / or configuration of the UE, the UE may not be able to measure one or more DL-PRS resources at the same time or during a configured duration. For example, different UEs may apply different strategies and / or mechanisms to measure DL-PRS resources. Thus, how the UE measures DL-PRS resources may depend on the implementation and may vary for various UEs. Since UL-SRS transmissions / resources may be pre-configured for the UE and may not be dynamically updated and / or changed for the UE, some UL-SRS transmissions may not be efficient / useful for estimating the UE's location based on multi-RTT measurements if the UE is unable to measure the corresponding DL-PRS in one or more measurement instances. For example, referring to FIG. 6, the UE 602 may have the capability to measure one DL-PRS resource from one BS in one measurement instance. If 16 DL-PRS resources are transmitted from BSs 604, 606, 608, and 610 to the UE 602, it may require 16 measurement instances for the UE 602 to complete measurements for the 16 DL-PRS resources. In other words, when the UE 602 is measuring DL-PRS resources from one of the BSs, the UE 602 may not be able to measure DL-PRS resources from the other BSs. If the UE 602 is not able to measure DL-PRS resources during one or more measurement instances, the corresponding UL-SRS transmitted from the UE 602 may not be efficient / useful for estimating the UE's location. Similarly, if the base station / BS or an LMF associated with the base station is not able to measure one or more UL-SRS resources simultaneously or for a configured duration, some DL-PRS transmissions may not be efficient / useful for estimating the UE's location if the base station / BS or an LMF associated with the base station is not able to measure the corresponding UL-SRS for which the UE reports measurements during one or more measurement instances.

[0070]

[0078] Aspects presented herein may improve positioning based on multi-RTT measurements for UEs and base stations. Aspects presented herein may enable the base station / LMF and the UE to communicate with each other to indicate one or more DL-PRS and / or UL-SRS resources that the UE and / or base station are measuring or are prioritized to measure, so that the correct pair of DL-PRS / UL-SRS resources can be measured by the UE and / or base station to improve performance and accuracy of positioning based on multi-RTT measurements.

[0071]

[0079] In one aspect of the disclosure, if a measurement occasion for a DL-PRS occurs before a transmission opportunity for a UL-SRS, the UE may be configured to indicate to the base station or an LMF associated with the base station a list of DL-PRS resources that the UE will or is configured to measure and / or has measured at the measurement occasion. In response to the list of PRS resources, the base station (or the TRP of the base station) may measure the UL-SRS corresponding to the DL-PRS that the UE measured, such that measurements for the DL-PRS and UL-SRS pair may be completed at the measurement occasion.

[0072]

[0080] 7 is a communication flow 700 illustrating an example of a UE communicating with a base station regarding DL-PRS resources to be measured, according to an aspect of the disclosure. Optional aspects may be indicated with dashed lines.

[0073]

[0081] At 705, the UE 704 and / or the base station 702 (or an LMF associated with the base station 702) may determine an association between the PRS and the SRS. For example, the UE 704 may determine an association between one or more receiving properties of the PRS resources and one or more transmitting properties of the SRS resources, the base station 702 may determine an association between one or more receiving properties of the SRS resources and one or more transmitting properties of the SRS resources, etc.

[0074]

[0082] In one example, the one or more receive properties may be associated with at least one receive beam that the UE 704 may use to receive a PRS in the PRS resource or the base station 702 may use to receive an SRS in the SRS resource, and the one or more transmit properties may be associated with at least one transmit beam that the UE 704 may use to transmit an SRS in the SRS resource or the base station 702 may use to transmit a PRS in the PRS resource, and thus the at least one receive beam and the at least one transmit beam may have a same set of associated beam directions. For example, the one or more receive properties at the UE 704 may indicate that if the UE 704 receives a PRS using one or more receive beams at the UE 704, the UE 704 may transmit the corresponding SRS using one or more transmit beams corresponding to the one or more receive beams, and thus the one or more receive beams and the one or more transmit beams may have the same set of associated beam directions. Similarly, one or more receiving properties at base station 705 may indicate that if base station 702 transmits a PRS using one or more transmit beams at base station 702, then base station 702 may receive a corresponding SRS using one or more receive beams corresponding to the one or more transmit beams, and thus the one or more transmit beams and one or more receive beams may have the same set of associated beam directions.

[0075]

[0083] In another example, the one or more reception properties may be associated with a reception power of the PRS / SRS and the one or more transmission properties may be associated with a transmission power of the SRS / PRS. For example, the one or more reception properties may indicate that if the UE 704 receives a PRS from the base station 702 with a measured power (e.g., a measured RSRP) below a threshold, the UE 704 may increase the transmission power for the SRS. Similarly, if the base station 702 receives an SRS from the UE 704 with a measured power below a threshold, the base station 702 may increase the transmission power for the PRS, etc.

[0076]

[0084] In another example, the one or more reception properties may be associated with reception timing of the PRS / SRS and the one or more transmission properties may be associated with transmission timing of the SRS / PRS. For example, the one or more reception properties may indicate that if the UE 704 is not receiving a PRS from the base station 702, then the UE 704 may not transmit an SRS corresponding to the base station 702, or the UE 704 may apply a timing offset to the transmission of the SRS, etc.

[0077]

[0085] At 706, the UE 704 may transmit information 708 to the base station 702 indicating one or more PRS resources that the UE 704 is or will be measuring (e.g., configured to measure) at the UE 704 (e.g., through at least one of the receive beams at the UE 704). For example, as shown at 718, the information 708 may indicate that, at a given measurement occasion, the UE 704 is or is configured to measure DL-PRS resources 710, 712, and 714, and / or that the UE 704 is measuring DL-PRS resource 716, etc. The UE 704 may autonomously determine the one or more PRS resources that the UE 704 is or is configured to measure from the set of PRS resources without receiving input from the base station 702. For example, the UE 704 may measure a set of PRS resources from the base station 702 in advance, and based at least in part on the prior measurements, the UE 704 may select a subset of PRS resources from the set of PRS resources as one or more PRS resources that the UE 704 is to measure at a given measurement occasion.

[0078]

[0086] In one example, the UE 704 may transmit the information 708 to the base station in a lower layer message, such as an uplink control information (UCI) and / or a medium access control (MAC) control element (CE) (MAC-CE). In another example, the UE 704 may transmit the information 708 to the base station in a higher layer message, such as via radio resource control (RRC) signaling. The base station 702 may forward the information 708 to other base stations and / or TRPs associated with the positioning session of the UE 704 (e.g., as shown in FIG. 8). In one example, the base station 702 may be a serving base station and the base station 702 may receive the information 708 directly from the UE 704. In another example, the base station 702 may not be a serving base station for the UE 704 and the base station 702 may receive the information 708 indirectly from another base station, such as from at least one serving base station of the UE 704.

[0079]

[0087] At 720, the base station 702 may transmit DL-PRS on one or more DL-PRS resources based on the one or more transmission properties determined at 705. For example, the base station 702 may transmit one or more DL-PRS using a designated set of transmission beams (e.g., based on a beam previously used to receive a UL-SRS in a previous measurement occasion), using a designated transmit power (e.g., based on a received power of a UL-SRS received in a previous measurement occasion), and / or using a designated transmission timing. The one or more DL-PRS resources may include DL-PRS resources 710, 712, and 714.

[0080]

[0088] At 722, based on the transmitted information 708, the UE 704 may measure DL-PRS received from the base station 702 on the DL-PRS resources based on one or more reception properties determined at 705. For example, the UE 704 may measure DL-PRS received on DL-PRS resources 710, 712, and 714 as shown in the information 708. In some examples, the information 708 may be determined based on the capabilities of the UE 704 (e.g., based on the capabilities of the UE), such as how many DL-PRS or a maximum number of DL-PRS may be measured by the UE 704 in a measurement occasion. After the UE 704 transmits the information 708 to the base station 702, the UE 704 may prioritize its measurements for DL-PRS based at least in part on the transmitted information 708. For example, the UE 704 may prioritize its measurements for DL-PRS received in DL-PRS resources 710, 712, and 714 as shown in the information 708.

[0081]

[0089] At 724, after the UE 704 measures the DL-PRS transmitted from the base station 702, the UE 704 may transmit to the base station 702 one or more UL-SRS on the UL-SRS resources based on the one or more transmission properties determined at 705. For example, the UE 704 may transmit the one or more UL-SRS using a designated set of transmit beams based on the receive beams (e.g., beams having the same or related direction) used to receive the DL-PRS, using a designated transmit power based on the receive power of the DL-PRS, and / or using a designated transmit timing based on the receive timing of the DL-PRS, etc. The UL-SRS resources may include UL-SRS resources 726, 728, and 730, which may correspond to the DL-PRS resources 710, 712, and 714 that the UE 704 is measuring, respectively, as indicated by the UE 704 in the information 708. In some examples, at least one transmit / SRS beam and at least one receive beam (e.g., a beam used by the UE 704 to receive a corresponding DL-PRS) may have the same set of associated beam directions. For example, if the UE 704 uses a first receive beam to receive a DL-PRS transmitted on DL-PRS resources 710, the UE 704 may use a transmit / SRS beam having the same beam direction as the first receive beam to transmit a UL-SRS using UL-SRS resources 726. Similarly, if the UE 704 uses a second receive beam to receive a DL-PRS transmitted on DL-PRS resources 712, the UE 704 may use a transmit / SRS beam having the same beam direction as the second receive beam to transmit a UL-SRS using UL-SRS resources 728, and so on.

[0082]

[0090] At 724, the base station 702 may receive the UL-SRS transmitted from the UE 704 on the UL-SRS resource based on one or more reception properties determined at 705, such as receiving the UL-SRS using a designated reception beam. The UL-SRS resource may include UL-SRS resources 726, 728, and 730, which may correspond to DL-PRS resources 710, 712, and 714 transmitted by the base station 702, respectively. In some examples, at least one transmit beam (e.g., a beam used to transmit DL-PRS) and at least one receive beam (e.g., a beam used to receive UL-SRS) may have the same set of associated beam directions. For example, if the base station 702 uses a first transmit beam to transmit DL-PRS on the DL-PRS resource 710, the base station 702 may use a receive beam having the same beam direction as the first transmit beam to receive the UL-SRS transmitted on the UL-SRS resource 726. Similarly, if the base station 702 uses a second transmit beam to transmit a DL-PRS on the DL-PRS resource 714, the base station 702 may use a receive beam having the same beam direction as the second transmit beam to receive a UL-SRS transmitted on the UL-SRS resource 730, and so on.

[0083]

[0091] At 732, based on the received UL-SRS and the information 708, the base station 702 may measure a UL-SRS corresponding to the DL-PRS measured by the UE 704 or prioritize the measurement of the UL-SRS, so that the correct pair of UL-SRS and DL-PRS is measured and completed during one or more measurement occasions. For example, if the information 708 indicates that the UE 704 is configured to or will measure a DL-PRS transmitted on DL-PRS resources 710, 712, and 714, the base station 702 may prioritize its measurement over the corresponding UL-SRS transmitted on UL-SRS resources 726, 728, and 730, respectively, so that multiple pairs of DL-PRS / UL-SRS measurements can be completed at the base station 702 during the measurement occasion.

[0084]

[0092] At 734, the base station 702 or an LMF associated with the base station 702 may determine an RTT between the received UL-SRS and the transmitted DL-PRS, and the base station 702 or the LMF may determine or estimate a position of the UE 704 relative to the base station 702 based at least in part on the determined RTT, as described in relation to FIG. 4.

[0085]

[0093] In one example, the information 708 may be transmitted before the UE 704 measures the PRS received from the base station 702 (e.g., at 722). In such an example, the UE 704 may determine that a quality metric for one or more PRS resources in the information 708 exceeds a threshold at a previous measurement occasion, and the information 708 may indicate one or more PRS resources having a quality metric that exceeds the threshold. For example, the quality metric may include an RSRP, a line of sight (LoS) probability, and / or a timing delay calibration value, etc. In other words, the information 708, or the PRS resources that the UE 704 will or is configured to measure, may be determined based at least in part on one or more previous measurements. For example, the UE 704 may determine that a PRS received over a set of PRS resources has a measurement of the highest RSRP, and the UE 704 may include the set of PRS resources in the information 708.

[0086]

[0094] In another example, the UE 704 may transmit information 708 indicating one or more PRS resources that the UE 704 plans to measure after the PRS received from the base station 702 is measured. In such an example, the UE 704 may determine a quality metric for the one or more PRS resources in the information 708. The UE 704 may then determine a subset of the one or more PRS resources having a quality metric that exceeds a threshold, and thus the information 708 may indicate the subset of the one or more PRS resources having a quality metric that exceeds the threshold. Similarly, the quality metric may include at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value, etc. For example, if the UE 704 receives a PRS from the base station 702 before transmitting the information 708, the UE 704 may measure the received PRS, and the UE 704 may select one or more PRS resources associated with the measured PRS in the information 708. In other words, the UE 704 may determine one or more PRS resources to be included in the information 708 based on an RSRP, a line-of-sight probability, or a timing delay calibration value of the PRS received prior to transmission of the information 708. In another example, the UE 704 may be configured to transmit the information 708 within a configured duration of measurement of the PRS (e.g., before or after the PRS is measured). For example, the UE 704 may be configured to transmit the information 708 within 5 ms after measuring the PRS received from the base station 702.

[0087]

[0095] 8 is a communication flow 800 illustrating an example of a UE communicating with multiple base stations regarding DL-PRS resources to be measured, according to an aspect of the disclosure. Optional aspects may be indicated with dashed lines.

[0088]

[0096] At 809, the UE 804 and / or the serving base station 802 (or an LMF associated with the serving base station 802) may determine an association between the PRS and the SRS. For example, the UE 804 may determine an association between one or more reception properties of the PRS resources and one or more transmission properties of the SRS resources, the serving base station 802 may determine an association between one or more reception properties of the SRS resources and one or more transmission properties of the SRS resources, etc.

[0089]

[0097] In one example, the one or more receive properties may be associated with at least one receive beam that the UE 804 may use to receive a PRS in the PRS resource or that the serving base station 802 (or a non-serving base station) may use to receive an SRS in the SRS resource, and the one or more transmit properties may be associated with at least one transmit beam that the UE 804 may use to transmit an SRS in the SRS resource or that the serving base station 802 (or a non-serving base station) may use to transmit a PRS in the PRS resource, and thus the at least one receive beam and the at least one transmit beam may have the same set of associated beam directions. For example, the one or more receive properties at the UE 804 may indicate that if the UE 804 receives a PRS using one or more receive beams at the UE 804, then the UE 804 may transmit an SRS using one or more transmit beams corresponding to the one or more receive beams, and thus the one or more receive beams and the one or more transmit beams may have the same set of associated beam directions. Similarly, one or more receiving properties at the serving base station 802 may indicate that if the serving base station 802 transmits a PRS using one or more transmit beams at the serving base station 802, the serving base station 802 may receive an SRS using one or more receive beams corresponding to the one or more transmit beams, and thus the one or more transmit beams and the one or more receive beams may have the same set of associated beam directions.

[0090]

[0098] In another example, the one or more receive properties may be associated with a receive power of the PRS / SRS and the one or more transmit properties may be associated with a transmit power of the SRS / PRS. For example, the one or more receive properties may indicate that if the UE 804 receives a PRS from the serving base station 802 with a measured power (e.g., a measured RSRP) below a threshold, the UE 804 may increase the transmit power for the SRS. Similarly, if the serving base station 802 (or other non-serving base station) receives an SRS from the UE 804 with a measured power below a threshold, the base station 802 (or other non-serving base station) may increase the transmit power for the PRS, etc.

[0091]

[0099] In another example, the one or more receive properties may be associated with receive timing of the PRS / SRS and the one or more transmit properties may be associated with transmit timing of the SRS / PRS. For example, the one or more receive properties may indicate that if the UE 804 is not receiving a PRS from the serving base station 802 (or other non-serving base station), then the UE 804 may not transmit a corresponding SRS to the serving base station 802 (or other non-serving base station), or that the UE 804 may apply a timing offset to the transmission of the SRS, etc.

[0092]

[0100] At 806, the UE 804 may transmit information 808 to the serving base station 802 or an LMF associated with the serving base station 802 through one of the base stations associated with the positioning session of the UE 804. For example, the UE 804 may establish a positioning session with a first BS 801, a second BS 803, a third BS 805, and a fourth BS 807, where each of the BSs may be a serving or non-serving base station for the UE 804. In one example, the serving base station 802 may be one of BS 801, 803, 805, or 807 (e.g., the serving base station 802 may be the first BS 801). In another example, the serving base station 802 may be different from BS 801, 803, 805, or 807. Communications between the UE 804 and the serving base station 802 or the LMF may be forwarded to other non-serving base stations. For example, if the first BS 801 is a serving base station for the UE 804 (e.g., the first BS 801 is the serving base station 802), but the second BS 803, the third BS 805, and the fourth BS 807 are not serving base stations for the UE 804, the UE 804 may transmit information 808 to the first BS 801 indicating one or more PRS resources that the UE 804 is / will be measuring or is measuring at the UE 804. The first BS 801 may then forward the information 808 to the second BS 803, the third BS 805, and / or the fourth BS 807.

[0093]

[0101] In one example, as shown at 818, the information 808 may indicate that the UE 804 will or is configured to measure DL-PRS 810, 812, 814, and 816 transmitted from a first BS 801, a second BS 803, a third BS 805, and a fourth BS 807, respectively. The first BS 801, the second BS 803, the third BS 805, and the fourth BS 807 (collectively referred to as "associated BSs") of FIG. 8 may correspond to the first BS 604, the second BS 606, the third BS 608, and the fourth BS 610 of FIG. 6. The UE 804 may transmit the information 808 to the first BS 801 in at least one of UCI, MAC-CE, and / or RRC signaling. Then, at 809, the first BS 801 or base station 802 may forward the information 808 to other BSs associated with the positioning session of the UE 804, such as the second BS 803, the third BS 805, and / or the fourth BS 807. The UE 804 may autonomously determine one or more PRS resources that the UE 804 is to measure (e.g., is configured to measure) from the set of PRS resources without receiving input from the serving base station 802. For example, the UE 804 may measure a set of PRS resources from one or more of the serving and / or non-serving base stations in advance, and based at least in part on the measurements, the UE 804 may select a subset of PRS resources from the set of PRS resources as the one or more PRS resources that the UE 804 is to measure.

[0094]

[0102] At 820, each of the first BS801, the second BS803, the third BS805, and the fourth BS807 may transmit one or more DL-PRS based on the one or more transmission properties determined at 809. The one or more transmission properties may include a designated set of transmission beams, a designated transmission power, and / or a designated transmission timing, etc. For example, the first BS801 may transmit a set of DL-PRS including DL-PRS810 to the UE804, the second BS803 may transmit a set of DL-PRS including DL-PRS812 to the UE804, the third BS805 may transmit a set of DL-PRS including DL-PRS814 to the UE804, the fourth BS807 may transmit a set of DL-PRS including DL-PRS816 to the UE804, etc. As shown by FIG. 5A, DL-PRS transmitted from different BSs may be multiplexed with each other based on a comb pattern.

[0095]

[0103] At 822, based on the transmitted information 808, the UE 804 may measure (or prioritize its measurement relative to) DL-PRS received from the first BS 801, the second BS 803, the third BS 805, and the fourth BS 807 on the DL-PRS resources based on the one or more reception properties determined at 705. In some examples, the information 808 may be determined based on the capabilities of the UE 804, such as how many DL-PRS or a maximum number of DL-PRS may be measured by the UE 804 in a measurement occasion.

[0096]

[0104] At 824, after the UE 804 measures the DL-PRS transmitted from the associated BS, the UE 804 may transmit one or more UL-SRS to the associated BS based on the one or more transmission properties determined at 809. For example, the UE 804 may transmit the one or more UL-SRS using a designated set of transmit beams based on the receive beams (e.g., beams having the same or related direction) used to receive the DL-PRS, using a designated transmit power based on the receive power of the DL-PRS, and / or using a designated transmit timing based on the receive timing of the DL-PRS, etc. The one or more UL-SRS may include UL-SRSs 826, 828, 830, and 832, which may correspond to DL-PRSs 810, 812, 814, and 816, respectively, that the UE 804 may have measured, as indicated by the UE 804 in the information 808. In some examples, at least one transmit / SRS beam and at least one receive beam (e.g., a beam used by the UE 804 to receive a corresponding DL-PRS from one of the associated BSs) may have the same set of associated beam directions. For example, if the UE 804 uses a first receive beam to receive a DL-PRS 810 from a first BS 801, the UE 804 may use a transmit / SRS beam with the same beam direction as the first receive beam to transmit a UL-SRS 826 corresponding to the first BS 801. Similarly, if the UE 804 uses a second receive beam to receive a DL-PRS 812 from a second BS 803, the UE 804 may use a transmit / SRS beam with the same beam direction as the second receive beam to transmit a UL-SRS 828 corresponding to the second BS 803, and so on. Thus, in some examples, as illustrated by FIG. 6, the UE may use different beams with different transmit / receive directions to communicate with different BSs and / or base stations that are in different directions relative to the UE.

[0097]

[0105] At 824, one or more of the associated BSs may receive the UL-SRS transmitted from the UE 804 based on one or more reception properties determined at 809, such as receiving the UL-SRS using a designated reception beam, reception power, and / or timing, etc. For example, the first BS 801 may receive the UL-SRS 826 through at least one reception beam at the first BS 801, the third BS 805 may receive the UL-SRS 830 through at least one reception beam at the third BS 805, etc. In some examples, the beams used by the BS to transmit the DL-PRS and the beams used by the BS to receive the corresponding UL-SRS may have the same set of associated beam directions. For example, if the first BS 801 uses a first transmission beam to transmit the DL-PRS 810, the first BS 801 may use a reception beam having the same beam direction as the first transmission beam to receive the UL-SRS 826. Similarly, if the fourth BS807 uses a second transmitting beam to transmit DL-PRS816, the fourth BS807 may use a receiving beam having the same beam direction as the second transmitting beam to receive UL-SRS826, and so on.

[0098]

[0106] At 834, based on the received UL-SRS and information 808, the first BS 801, the second BS 803, the third BS 805, and the fourth BS 807 may measure the received UL-SRS or may give priority to measuring the UL-SRS that corresponds to the DL-PRS measured by the UE 804 (e.g., as indicated in information 808), so that the correct DL-PRS / UL-SRS pair can be measured in one or more measurement occasions or for a given duration. For example, if the information 808 may indicate that the UE 804 is configured / supposed to measure DL-PRS 810, 812, 814, and 816, then the first BS 801 may prioritize its measurements for the corresponding UL-SRS 826, the second BS 803 may prioritize its measurements for the corresponding UL-SRS 828, the third BS 805 may prioritize its measurements for the corresponding UL-SRS 830, the fourth BS 807 may prioritize its measurements for the corresponding UL-SRS 832, and so on.

[0099]

[0107] Based on the DL-PRS transmitted from the associated BSs and the UL-SRS received at the associated BSs, the serving base station 802 or an LMF associated with the serving base station 802 may calculate, collect, and / or derive an RTT between the received UL-SRS and the transmitted DL-PRS at each of the associated BSs, and the base station 802 or the LMF may determine or estimate the position of the UE 804 or the distance of the UE 804 relative to each of the associated BSs, as described in relation to FIG. 4.

[0100]

[0108] In one aspect of the disclosure, if a measurement occasion for UL-SRS occurs before a transmission opportunity for DL-PRS, the base station or an LMF associated with the base station may indicate a list of UL-SRS resources (or corresponding DL-PRS resources) to the UE. In one example, the list of UL-SRS resources (or corresponding DL-PRS resources) may be based on one or more UL-SRS received by the base station / TRP with a measurement (e.g., RSRP) above a threshold (e.g., in one or more previous measurement occasions). In response to the list of UL-SRS resources (or corresponding DL-PRS resources), the UE may prioritize its measurements on the corresponding DL-PRS resources in one or more measurement occasions, so that measurements for the correct pair of DL-PRS and UL-SRS may be completed during one or more measurement occasions.

[0101]

[0109] 9 is a communication flow 900 illustrating an example of a base station indicating a list of UL-SRSs to a UE for the UE to prioritize measurements of corresponding DL-PRSs, according to an aspect of the disclosure. Optional aspects may be indicated with dashed lines.

[0102]

[0110] At 906, the serving base station 902 or an LMF associated with the serving base station 902 may transmit information 908 to the UE 904 indicating one or more SRS resources or indicating one or more PRS resources corresponding to the one or more SRS resources that the UE 904 is configured to transmit at the UE 904 (e.g., based on one or more transmission properties). For example, as shown at 918, the information 908 may be transmitted from one of the serving and / or non-serving base stations associated with the positioning session of the UE 904, where the information 908 may indicate a list of UL-SRS or a list of DL-PRS corresponding to the list of UL-SRS for which the UE 904 may prioritize its measurements. In one example, the first BS 901 may transmit the information 908 after the SRS is measured within a configured duration of measurement of the SRS. For example, the first BS 901 may be configured to transmit the information 908 within 2 ms after the SRS is measured.

[0103]

[0111] For example, as shown at 918, the information 908 may indicate a list of UL-SRS resources (or a list of corresponding DL-PRS), which may include UL-SRS resources 910, 912, 914, and 916 (or corresponding DL-PRS resources 926, 928, 930, and 932) that the base station 902 may consider to have good or suitable measurements (e.g., or channel quality), such as having an RSRP measurement above a threshold (described in more detail below). For example, at one or more previous UL-SRS transmission opportunities from UE904, a first BS901 of base station902 may determine that a UL-SRS received on UL-SRS resource 910 has a better measurement at the first BS901 (e.g., having an RSRP measurement above a threshold), a second BS903 of base station902 may determine that a UL-SRS received on UL-SRS resource 912 has a better measurement at the second BS903, a third BS905 of base station902 may determine that a UL-SRS received on UL-SRS resource 914 has a better measurement at the third BS905, a fourth BS907 of base station902 may determine that a UL-SRS received on UL-SRS resource 916 has a better measurement at the fourth BS907, and so on. In one example, the serving base station 902 may be one of BSs 901, 903, 905, or 907 (e.g., the serving base station 902 may be the first BS 901). In another example, the serving base station 902 may be different from BSs 901, 903, 905, or 907. Communications between the UE 904 and the serving base station 902 or the LMF may be forwarded to other non-serving base stations. In another example, the base station may determine the information 908 (e.g., a list of SRS resources) by determining a quality metric for one or more SRS resources and determining a subset of SRS resources based on the SRS resources in the subset having a quality metric above a threshold, where the quality metric may include or be associated with at least one of an RSRP, an LoS probability, or a timing delay calibration value, etc.In other words, the serving base station 902 may determine the information 908 indicating the list of UL-SRSs based on the RSRP, LoS probability, and / or timing delay calibration value associated with the received SRS. The base station 902 may transmit the information 908 to the UE through lower layer messages, such as downlink control information (DCI) and / or MAC-CE, and / or through higher layer messages, such as via RRC signaling. In some examples, transmitting the information 908 via RRC signaling may take more time and transmitting the information 908 via lower layer messages may be lower latency, which may be more beneficial.

[0104]

[0112] At 920, the UE 904 may transmit the UL-SRS on a set of UL-SRS resources from one or more transmit / SRS beams of the UE 904 based on one or more transmission properties at the UE 904, which may include UL-SRS resources 910, 912, 914, and 916. As shown by FIG. 5B, the transmitted UL-SRS may be configured in a comb pattern. In one example, the UE 904 may use different transmit beams, transmit powers, and / or transmit timings to transmit the UL-SRS on different UL-SRS resources. For example, UE 904 may use a first transmit beam, transmit power, and / or transmit timing to transmit UL-SRS on UL-SRS resource 910, use a second transmit beam, transmit power, and / or transmit timing to transmit UL-SRS on UL-SRS resource 912, use a third transmit beam, transmit power, and / or transmit timing to transmit UL-SRS on UL-SRS resource 914, use a fourth transmit beam, transmit power, and / or transmit timing to transmit UL-SRS on UL-SRS resource 916, etc.

[0105]

[0113] At 922, one or more of the first BS 901, the second BS 903, the third BS 905, and the fourth BS 907 (collectively referred to as “associated BSs”) may receive the UL-SRS transmitted from the UE 904 based on one or more reception properties (e.g., through at least one reception beam at one or more BSs, based on reception power, and / or based on reception timing, etc.). For example, the first BS 901 may receive the UL-SRS transmitted on the UL-SRS resource 910 through at least one reception beam at the first BS 901, the third BS 905 may receive the UL-SRS transmitted on the UL-SRS resource 914 through at least one reception beam at the third BS 905, etc.

[0106]

[0114] At 924, one or more associated BSs may transmit corresponding DL-PRS based on one or more transmit properties associated with one or more receive properties at the one or more BSs. For example, a first BS 901 may transmit DL-PRS to the UE 904 in a set of DL-PRS resources including DL-PRS resource 926, a second BS 903 may transmit DL-PRS to the UE 904 in a set of DL-PRS resources including DL-PRS resource 928, a third BS 905 may transmit DL-PRS to the UE 904 in a set of DL-PRS resources including DL-PRS resource 930, a fourth BS 907 may transmit DL-PRS to the UE 904 in a set of DL-PRS resources including DL-PRS resource 932, etc. As illustrated by FIG. 5A, DL-PRS transmitted from different BSs may be multiplexed with each other based on the comb pattern. In some examples, one or more beams used by a BS to receive UL-SRS from a UE 904 and one or more beams used by the BS to transmit DL-PRS to the UE 904 may have the same set of associated beam directions. For example, if a first BS 901 uses a first receive beam to receive UL-SRS on UL-SRS resources 910, the first BS 901 may use a transmit beam having the same beam direction as the first receive beam to transmit DL-PRS on DL-PRS resources 926. Similarly, if a fourth BS 907 uses a second receive beam to receive UL-SRS on UL-SRS resources 910, the fourth BS 907 may use a transmit beam having the same beam direction as the second receive beam to transmit DL-PRS on DL-PRS resources 932, etc. In other examples, if a base station receives a UL-SRS with a receive power (e.g., RSRP) below a threshold, the base station may transmit a corresponding DL-PRS with increased power.

[0107]

[0115] At 925, based at least in part on the information 908, the UE 904 may prioritize measurements of its DL-PRS for DL-PRS received from one or more of the associated BSs, where the UE 904 may receive the DL-PRS based on one or more receive properties (e.g., Tx / Rx beam, Tx / Rx power, and / or Tx / Rx timing, etc.) associated with one or more transmit properties at the UE. For example, if the information 908 indicates that a UL-SRS received on UL-SRS resources 910, 912, 914, and 916 is to be measured by the UE 904 (e.g., as having a better (e.g., higher quality) measurement), then the UE 904 may prioritize measurements of its DL-PRS for the DL-PRS corresponding to the transmitted UL-SRS (e.g., a DL-PRS transmitted on DL-PRS resources 926, 928, 930, and 932, etc.). For example, when UE 904 also receives other DL-PRS that are not associated with the UL-SRS resources indicated in information 908, and UE 904 does not have the ability to measure them at the same time in the measurement occasion, UE 904 may decide to prioritize the measurement of its DL-PRS.

[0108]

[0116] Based on the UL-SRS transmitted from the UE 904 and the DL-PRS received at the UE 904, the UE 904 may determine a time difference between the transmission of the SRS and the reception of the PRS, and the UE 904 may then transmit information indicating the time difference in a measurement report to the serving base station 902 or another serving base station.

[0109]

[0117] 9 shows the UE 904 prioritizing its measurements for DL-PRS received from the first BS 901, the second BS 903, the third BS 905, and the fourth BS 907, but the examples are for illustration only. In some examples, if the measurement capabilities of the UE 904 are limited or reduced, the UE 904 may also prioritize its measurements among the first BS 901, the second BS 903, the third BS 905, and / or the fourth BS 907, such as measuring DL-PRS from different BSs at different measurement occasions. For example, if the UE 904 is limited to measuring eight DL-PRS in a measurement instance and each of the four BSs transmits at least eight DL-PRS to the UE 904 in each transmission instance, the UE 904 may be configured to measure eight DL-PRS from the first BS 901 in a first measurement instance, eight DL-PRS from the second BS 903 in a second measurement instance, eight DL-PRS from the third BS 905 in a third measurement instance, and so on. In another example, the UE 904 may be configured to measure two DL-PRS from each of the four BSs in a measurement instance. In another example, the UE 904 may be configured to measure four DL-PRS from the first BS 901 and four DL-PRS from the third BS 905 in a first measurement instance, four DL-PRS from the second BS 903 and four DL-PRS from the fourth BS 907 in a second measurement instance, and so on.

[0110]

[0118] As shown at 918, the information 908 may indicate a list of UL-SRS resources (or a list of DL-PRS resources corresponding to the list of UL-SRS resources) for which the base station 902 may be considered to have good or suitable measurements, such as having a measurement of RSRP above a threshold. FIG. 10 is a diagram 1000 illustrating an example of a serving base station determining a list of UL-SRS resources for which the UE may prioritize measurements of its DL-PRS based on a previous measurement instance. In one example, as shown at 1002, in a previous measurement instance (e.g., measurement instance 1), the UE (e.g., UE 904) may have transmitted UL-SRS on a set of UL-SRS resources received by a first BS (e.g., BS1, first BS 901), a second BS (e.g., BS2, second BS 903), a third BS (e.g., BS3, third BS 905), and a fourth BS (e.g., BS4, fourth BS 907), which may or may not include the serving base station (e.g., serving base station 902). If each of the four BSs has measured the UL-SRS transmitted from the UE and determines that the measured UL-SRS has a measurement above a threshold at each BS, the serving base station may include the UL-SRS resources associated with the four BSs (or their corresponding DL-PRS) in a list of UL-SRS resources on which the UE may prioritize its DL-PRS measurements (e.g., the list of UL-SRS resources in information 908). Based on the list, the UE may continue to perform measurements with any of the four BSs.

[0111]

[0119] In another example, as shown in 1004, if in a previous measurement instance (e.g., measurement instance 2), the first and second BSs have high quality measurements (e.g., measurements above a threshold or the highest measurements among multiple BSs, etc.) and the third and fourth BSs do not have measurements above a threshold or have not received a UL-SRS transmitted from the UE, the serving base station may include the UL-SRS resources associated with the first and second BSs (or their corresponding DL-PRS) in a list of UL-SRS resources on which the UE may prioritize its DL-PRS measurements (e.g., the list of UL-SRS resources in information 908). Based on the list, the UE may focus / prioritize the DL-PRS measurements on the resources of the first and second BSs, and the DL-PRS measurements on the third and fourth BSs may be de-prioritized by the UE in the current measurement occasion or prioritized in a later measurement occasion.

[0112]

[0120] Similarly, as shown at 1006, if in a previous measurement instance (e.g., measurement instance 3), the first BS and the fourth BS have measurements above the threshold and the second BS and the third BS do not have measurements above the threshold or have not received a UL-SRS transmitted from the UE, the serving base station may include the UL-SRS resources associated with the first BS and the fourth BS (or their corresponding DL-PRS) in a list of UL-SRS resources on which the UE may prioritize its DL-PRS measurements (e.g., the list of UL-SRS resources in information 908). Based on the list, the UE may focus / prioritize DL-PRS measurements on resources of the first BS and the fourth BS, and DL-PRS measurements on the second BS and the third BS may be de-prioritized by the UE in the current measurement occasion or prioritized in a later measurement occasion. As shown in 1008, if in a previous measurement instance (e.g., measurement instance 4), the second BS and the fourth BS have measurements above the threshold and the first BS and the third BS do not have measurements above the threshold or have not received a UL-SRS transmitted from the UE, the serving base station may include the UL-SRS resources associated with the second BS and the fourth BS (or their corresponding DL-PRS) in a list of UL-SRS resources on which the UE may prioritize its DL-PRS measurements (e.g., the list of UL-SRS resources in information 908). Based on the list, the UE may focus / prioritize DL-PRS measurements on resources of the second BS and the fourth BS, and DL-PRS measurements on the first BS and the third BS may be de-prioritized by the UE in the current measurement occasion or prioritized in a later measurement occasion, etc.

[0113]

[0121] 11 is a flowchart 1100 of a method of wireless communication. The method may be performed by a UE or a component of a UE (e.g., a processing system that may include a UE 104, 350, 404, 602, 704, 804, an apparatus 1202, a memory 360, and may be the UE 350 in its entirety or a component of the UE 350 such as a TX processor 368, an RX processor 356, and / or a controller / processor 359). Optional aspects are shown in dashed lines. The method may enable the UE to indicate to the base station a list of PRS resources that the UE intends to measure at a given occasion, where the PRS measurement occasion may occur before an SRS transmission occasion.

[0114]

[0122] At 1102, the UE may determine an association between one or more reception properties of one or more PRS resources and one or more transmission properties of one or more SRS resources, as described with respect to Figures 7 and 8. For example, at 705, the UE 704 may determine an association between reception properties of a PRS and transmission properties of a corresponding SRS. The association determination may be performed, for example, by a PRS-to-SRS association component 1240 of the apparatus 1202 in Figure 12.

[0115]

[0123] In one example, as shown in 1110, one or more receive properties for receiving a PRS may be associated with at least one receive beam, and one or more transmit properties for transmitting an SRS may be associated with at least one transmit beam, where the at least one receive beam and the at least one transmit beam may have the same set of associated beam directions.

[0116]

[0124] In another example, as shown at 1112, one or more receive properties for reception of the PRS may be associated with receive power, and one or more transmit properties for transmission of the SRS may be associated with transmit power.

[0117]

[0125] In another example, as shown at 1114, one or more receive properties for reception of the PRS may be associated with receive timing, and one or more transmit properties for transmission of the SRS may be associated with transmit timing.

[0118]

[0126] At 1104, the UE may transmit to at least one serving BS information indicating one or more PRS resources that the UE is configured to measure in future measurement occasions, as described with respect to Figures 7 and 8. For example, at 706, the UE 704 may transmit to the BS 702 information 708 indicating PRS resources to be measured by the UE 704. The transmission of the information indicating the one or more PRS resources may be performed, for example, by the PRS resource indication component 1242 and / or the transmission component 1234 of the apparatus 1202 of Figure 12. In one example, the information may be transmitted via at least one of UCI, MAC-CE, or RRC signaling. The UE may autonomously determine one or more PRS resources that the UE is configured to measure from a set of PRS resources, where the one or more PRS resources may be a subset of the set of PRS resources.

[0119]

[0127] At 1106, the UE may measure the PRS received from one or more BSs on one or more PRS resources based on one or more reception properties, as described with respect to Figures 7 and 8. For example, at 722, the UE 704 may measure the DL-PRS received from the base station 702 on the DL-PRS resources 710, 712, and 714 based on one or more reception properties at the UE 704. The measurement of the PRS may be performed, for example, by the PRS measurement component 1244 and / or the receiving component 1230 of the apparatus 1202 in Figure 12.

[0120]

[0128] At 1108, the UE may transmit the SRS on one or more SRS resources based on one or more transmission properties to one or more BSs after measuring the PRS (and based on the association determined at 1110, 1112, and 1114), as described with respect to FIG. 7 and FIG. 8. For example, at 728, the UE 704 may transmit the UL-SRS on the UL-SRS resources 726, 728, and 730 based on one or more transmission properties associated with one or more reception properties at the UE. For example, the UE 704 may transmit the UL-SRS through at least one transmission beam at the UE 704, where the beam used to transmit the UL-SRS and the beam used to receive the DL-PRS may have the same set of associated beam directions. The transmission of the SRS may be performed, for example, by the SRS transmitting component 1246 and / or the transmitting component 1234 of the apparatus 1202 in FIG. 12.

[0121]

[0129] In one example, the one or more BSs may include the at least one serving BS, hi another example, the one or more BSs may be different from the at least one serving BS.

[0122]

[0130] In another example, the information indicating one or more PRS resources may be transmitted before the PRS is measured and may indicate one or more PRS resources that the UE is configured to measure. In such an example, the UE may determine that a quality metric for one or more PRS resources exceeds a threshold in a previous measurement occasion, where the information may indicate one or more PRS resources having a quality metric that exceeds the threshold. In such an example, the quality metric may include at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0123]

[0131] In another example, the information indicating the one or more PRS resources may be transmitted after the PRS is measured and may indicate a subset of the one or more PRS resources that the UE measured. In such an example, the UE may determine a quality metric for the one or more PRS resources, and the UE may determine a subset of the one or more PRS resources having a quality metric that exceeds a threshold, where the information may indicate the subset of the one or more PRS resources having a quality metric that exceeds the threshold. In such an example, the quality metric may include at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0124]

[0132] In another example, the information may be transmitted before or after the PRS is measured within a configured duration of the measurement of the PRS.

[0125]

[0133] 12 is a diagram 1200 illustrating an example of a hardware implementation for an apparatus 1202. The apparatus 1202 is a UE and includes a cellular baseband processor 1204 (also referred to as a modem) coupled to a cellular RF transceiver 1222 and one or more subscriber identity module (SIM) cards 1220, an application processor 1206 coupled to a secure digital (SD) card 1208 and a screen 1210, a Bluetooth module 1212, a wireless local area network (WLAN) module 1214, a global positioning system (GPS) module 1216, and a power source 1218. The cellular baseband processor 1204 communicates with the UE 104 and / or the BS 102 / 180 through the cellular RF transceiver 1222. The cellular baseband processor 1204 may include a computer-readable medium / memory. The computer-readable medium / memory may be non-transitory. The cellular baseband processor 1204 is responsible for general processing, including the execution of software stored in a computer-readable medium / memory. The software, when executed by the cellular baseband processor 1204, causes the cellular baseband processor 1204 to perform the various functions described above. The computer-readable medium / memory may also be used to store data that is manipulated by the cellular baseband processor 1204 when executing the software. The cellular baseband processor 1204 further includes a receiving component 1230, a communications manager 1232, and a transmitting component 1234. The communications manager 1232 includes one or more of the illustrated components. The components in the communications manager 1232 may be stored in a computer-readable medium / memory and / or configured as hardware in the cellular baseband processor 1204. The cellular baseband processor 1204 may be a component of the UE 350 and may include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359.In one configuration, the device 1202 may be a modem chip and may only include a baseband processor 1204, and in another configuration, the device 1202 may be an entire UE (e.g., see 350 in FIG. 3) and may include the additional modules previously described for the device 1202.

[0126]

[0134] The communications manager 1232 includes a PRS-to-SRS association component 1240 configured to determine an association between one or more reception properties of one or more PRS resources and one or more transmission properties of one or more SRS resources, e.g., as described with respect to 1102 of FIG. 11. The communications manager 1232 includes a PRS resource display component 1242 configured to transmit, to at least one serving BS, information indicating one or more PRS resources that the UE is configured to measure in future measurement occasions, e.g., as described with respect to 1104 of FIG. 11. The communications manager 1232 further includes a PRS measurement component 1244 configured to measure a PRS received from one or more BSs on the one or more PRS resources based on the one or more reception properties, e.g., as described with respect to 1106 of FIG. 11. The communications manager 1232 further includes an SRS transmission component 1246 configured to transmit an SRS on one or more SRS resources based on the one or more transmission properties to one or more BSs after measuring the PRS, e.g., as described with respect to 1108 of FIG. 11.

[0127]

[0135] The apparatus may include additional components that implement each of the blocks of the algorithm in the above-mentioned flowchart of Figure 11. Thus, each block in the above-mentioned flowchart of Figure 11 may be implemented by one component, and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to perform the described process / algorithm, implemented by a processor configured to perform the described process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0128]

[0136] In one configuration, the apparatus 1202, and in particular the cellular baseband processor 1204, includes means for determining an association between one or more reception properties of one or more PRS resources and one or more transmission properties of one or more SRS resources (e.g., a PRS-to-SRS association component 1240). The apparatus 1202 includes means for transmitting, to at least one serving BS, information indicating one or more PRS resources that the UE is configured to measure in future measurement occasions (e.g., a PRS resource indication component 1242 and / or a transmission component 1234). The apparatus 1202 includes means for measuring a PRS received from one or more BSs on one or more PRS resources based on one or more reception properties (e.g., a PRS measurement component 1244 and / or a reception component 1230). The apparatus 1202 includes means for transmitting an SRS on one or more SRS resources based on one or more transmission properties to one or more BSs after measuring the PRS (e.g., an SRS transmission component 1246 and / or a transmission component 1234). In one configuration, the information may be transmitted via at least one of UCI, MAC-CE, or RRC signaling.

[0129]

[0137] In one example, one or more receive properties for receiving a PRS may be associated with at least one receive beam, and one or more transmit properties for transmitting an SRS may be associated with at least one transmit beam, where the at least one receive beam and the at least one transmit beam may have the same set of associated beam directions.

[0130]

[0138] In another configuration, the one or more receive properties for reception of the PRS may be associated with receive power, and the one or more transmit properties for transmission of the SRS may be associated with transmit power.

[0131]

[0139] In another configuration, the one or more receive properties for reception of the PRS may be associated with receive timing, and the one or more transmit properties for transmission of the SRS may be associated with transmit timing.

[0132]

[0140] In another configuration, the UE may autonomously determine one or more PRS resources that the UE is configured to measure from a set of PRS resources, where the one or more PRS resources may be a subset of the set of PRS resources.

[0133]

[0141] In another configuration, the one or more BSs may include the at least one serving BS, or the one or more BSs may be different from the at least one serving BS.

[0134]

[0142] In another configuration, the information indicating the one or more PRS resources may be transmitted before the PRS is measured and may indicate the one or more PRS resources that the UE is configured to measure. In such a configuration, the apparatus 1202 includes means for determining that a quality metric for the one or more PRS resources exceeds a threshold at a previous measurement occasion, where the information may indicate the one or more PRS resources having a quality metric that exceeds the threshold. In such a configuration, the quality metric may include at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0135]

[0143] In another configuration, the information indicating the one or more PRS resources may be transmitted after the PRS is measured and may indicate a subset of the one or more PRS resources that the UE measured. In such a configuration, the apparatus 1202 includes means for determining a quality metric for the one or more PRS resources and means for determining a subset of the one or more PRS resources having a quality metric that exceeds a threshold, where the information may indicate the subset of the one or more PRS resources having a quality metric that exceeds the threshold. In such a configuration, the quality metric may include at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0136]

[0144] In another configuration, the information may be transmitted before or after the PRS is measured within the configured duration of the measurement of the PRS.

[0137]

[0145] The aforementioned means may be one or more of the aforementioned components of the apparatus 1202 configured to perform the functions recited by the aforementioned means. As described above, the apparatus 1202 may include the TX processor 368, the RX processor 356, and the controller / processor 359. Thus, in one configuration, the aforementioned means may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the aforementioned means.

[0138]

[0146] 13 is a flowchart 1300 of a method of wireless communication. The method may be performed by a base station or a component of a base station (e.g., a processing system that may include base station 102, 180, 310, 702, 802, BS 604, 606, 608, 610, 801, 803, 805, 807, device 1402, memory 376, and may be the entire base station 310 or a component of the base station 310 such as TX processor 316, RX processor 370, and / or controller / processor 375). Optional aspects are shown in dashed lines. The method may enable the base station to receive from the UE a list of PRS resources that the UE plans to measure at a given occasion, so that the base station may measure the SRS corresponding to the PRS measured by the UE such that the correct pair of SRS / PRS is measured by the base station at the measurement occasion.

[0139]

[0147] At 1302, the base station may receive information from the UE indicating one or more PRS resources that the UE is configured to measure or has measured in one measurement occasion, as described with respect to Figures 7 and 8. For example, at 706, the base station 702 may receive information 708 from the UE 704 indicating the PRS resources that the UE 704 will or is configured to measure in one measurement occasion. The reception of the information may be performed, for example, by the PRS resource indication process component 1440 and / or the receiving component 1430 of the apparatus 1402 in Figure 14. The information may be received via at least one of UCI, MAC-CE, or RRC signaling.

[0140]

[0148] At 1304, the base station may transmit a PRS on one or more indicated PRS resources based on one or more transmission properties, as described with respect to Figures 7 and 8. For example, at 720, the base station 702 may transmit a DL-PRS on DL-PRS resources 710, 712, and 714 to the UE 704 based on the information and based on one or more transmission properties at the base station. The transmission of the PRS may be performed, for example, by the PRS transmitting component 1442 and / or the transmitting component 1434 of the apparatus 1402 in Figure 14.

[0141]

[0149] At 1306, the base station may receive an SRS from the UE after transmitting the PRS on one or more SRS resources based on one or more receiving properties associated with the one or more transmission properties, as described with respect to Figures 7 and 8. For example, at 724, the base station 702 may receive an SRS from the UE 704 on SRS resources 726, 728, and 730 based on one or more receiving properties associated with the one or more transmission properties at the base station 702. For example, the base station 702 may receive an SRS from the UE 704 through at least one receiving beam at the base station 702, where a beam used to transmit a DL-PRS and a beam used to receive a corresponding UL-SRS may have the same set of associated beam directions. Receiving the SRS may be performed, for example, by an SRS receiving component 1444 and / or a receiving component 1430 of the apparatus 1402 in Figure 14.

[0142]

[0150] In one example, as shown in 1310, one or more transmit properties for transmitting the PRS may be associated with at least one transmit beam and one or more receive properties for receiving the SRS may be associated with at least one receive beam, where the at least one transmit beam and the at least one receive beam may have the same set of associated beam directions.

[0143]

[0151] In another example, as shown at 1312, one or more transmit properties for the transmission of the PRS may be associated with a transmit power, and one or more receive properties for the reception of the SRS may be associated with a receive power.

[0144]

[0152] In another example, as shown at 1314, one or more transmit properties for the transmission of the PRS may be associated with a transmit timing, and one or more receive properties for the reception of the SRS may be associated with a receive timing.

[0145]

[0153] At 1308, the base station may perform measuring the received SRS on one or more SRS resources corresponding to the indicated PRS resource or resources, as described with respect to Figures 7 and 8. For example, at 732, the base station 702 may measure the UL-SRS received from the UE 704 on SRS resources 726, 728, and 730. The SRS measurement may be performed, for example, by the SRS measurement component 1446 of the apparatus 1402 in Figure 14.

[0146]

[0154] In one example, the base station may determine at least one RTT associated with the transmitted PRS and the measured SRS.

[0147]

[0155] In one example, the base station may send the received information indicating the one or more PRS resources to the at least one other BS, hi another example, the information indicating the one or more PRS resources may be received from the UE via the at least one other BS.

[0148]

[0156] In one example, the information indicating the one or more PRS resources may be received before the PRS is transmitted, or the information indicating the one or more PRS resources may be received after the PRS is transmitted.

[0149]

[0157] In another example, the information may be received before or after the PRS is transmitted within a configured duration of the transmission of the PRS.

[0150]

[0158] FIG. 14 is a diagram 1400 illustrating an example of a hardware implementation for an apparatus 1402. The apparatus 1402 is a BS and includes a baseband unit 1404. The baseband unit 1404 may communicate with the UE 104 through a cellular RF transceiver. The baseband unit 1404 may include a computer-readable medium / memory. The baseband unit 1404 is responsible for general processing, including the execution of software stored in the computer-readable medium / memory. The software, when executed by the baseband unit 1404, causes the baseband unit 1404 to perform various functions described above. The computer-readable medium / memory may also be used to store data that is manipulated by the baseband unit 1404 when executing the software. The baseband unit 1404 further includes a receiving component 1430, a communication manager 1432, and a transmitting component 1434. The communication manager 1432 includes one or more of the illustrated components. The components in the communications manager 1432 may be stored in a computer-readable medium / memory and / or configured as hardware in the baseband unit 1404. The baseband unit 1404 may be a component of the BS 310 and may include the memory 376 and / or at least one of the TX processor 316, the RX processor 370, and the controller / processor 375.

[0151]

[0159] The communications manager 1432 includes a PRS resource indication process component 1440 configured to receive, from the UE, information indicating one or more PRS resources that the UE is configured to measure or has measured in a measurement occasion, e.g., as described with respect to 1302 of FIG. 13. The communications manager 1432 further includes a PRS transmission component 1442 configured to transmit a PRS on the indicated one or more PRS resources based on one or more transmit properties, e.g., as described with respect to 1304 of FIG. 13. The communications manager 1432 further includes an SRS reception component 1444 configured to receive, from the UE after transmitting the PRS, an SRS on one or more SRS resources based on one or more receive properties associated with the one or more transmit properties, e.g., as described with respect to 1306 of FIG. 13. The communications manager 1432 further includes an SRS measurement component 1446 configured to measure a received SRS on one or more SRS resources corresponding to the indicated one or more PRS resources, e.g., as described with respect to 1308 of FIG. 13.

[0152]

[0160] The apparatus may include additional components that implement each of the blocks of the algorithm in the above-mentioned flowchart of Figure 13. Thus, each block in the above-mentioned flowchart of Figure 13 may be implemented by one component, and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to perform the described process / algorithm, implemented by a processor configured to perform the described process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0153]

[0161] In one configuration, the apparatus 1402, and in particular the baseband unit 1404, includes means for receiving information from the UE indicating one or more PRS resources that the UE is configured to measure or has measured in one measurement occasion (e.g., PRS resource indication process component 1440 and / or receiving component 1430). The apparatus 1402 includes means for transmitting a PRS on the indicated one or more PRS resources based on one or more transmission properties (e.g., PRS transmission component 1442 and / or transmission component 1434). The apparatus 1402 includes means for receiving an SRS on one or more SRS resources from the UE after transmitting the PRS based on one or more reception properties associated with the one or more transmission properties (e.g., SRS reception component 1444 and / or reception component 1430). The apparatus 1402 includes means for measuring a received SRS on one or more SRS resources corresponding to the indicated one or more PRS resources (e.g., SRS measurement component 1446). The information may be received via at least one of UCI, MAC-CE, or RRC signaling.

[0154]

[0162] In one configuration, one or more transmit properties for transmitting the PRS may be associated with at least one transmit beam and one or more receive properties for receiving the SRS may be associated with at least one receive beam, where the at least one transmit beam and the at least one receive beam may have the same set of associated beam directions.

[0155]

[0163] In another configuration, the one or more transmit properties for transmission of the PRS may be associated with transmit power, and the one or more receive properties for reception of the SRS may be associated with receive power.

[0156]

[0164] In another configuration, the one or more transmit properties for transmission of the PRS may be associated with transmit timing, and the one or more receive properties for reception of the SRS may be associated with receive timing.

[0157]

[0165] In another configuration, the base station may determine at least one RTT associated with the transmitted PRS and the measured SRS.

[0158]

[0166] In another configuration, the base station may send the received information indicating the one or more PRS resources to the at least one other BS, hi another configuration, the information indicating the one or more PRS resources may be received from the UE via the at least one other BS.

[0159]

[0167] In another configuration, the information indicating the one or more PRS resources may be received before the PRS is transmitted, or the information indicating the one or more PRS resources may be received after the PRS is transmitted.

[0160]

[0168] In another configuration, the information may be received before or after the PRS is transmitted within a configured duration of the transmission of the PRS.

[0161]

[0169] The aforementioned means may be one or more of the aforementioned components of the apparatus 1402 configured to perform the functions recited by the aforementioned means. As described above, the apparatus 1402 may include the TX processor 316, the RX processor 370, and the controller / processor 375. Thus, in one configuration, the aforementioned means may be the TX processor 316, the RX processor 370, and the controller / processor 375 configured to perform the functions recited by the aforementioned means.

[0162]

[0170] 15 is a flowchart 1500 of a method of wireless communication. The method may be performed by a UE or a component of a UE (e.g., a processing system that may include a UE 104, 350, 404, 602, 904, an apparatus 1602, a memory 360, and may be the UE 350 entirely or a component of the UE 350, such as a TX processor 368, a RX processor 356, and / or a controller / processor 359). Optional aspects are indicated with dashed lines. The method may enable the UE to receive a list from a base station on which the UE may prioritize measurements of its PRS based at least in part on the list of SRS resources.

[0163]

[0171] At 1502, the UE may receive information from at least one serving BS indicating one or more SRS resources or one or more PRS resources corresponding to the one or more SRS resources, the one or more SRS resources being associated with one or more transmission properties, as described with respect to FIG. 9. For example, at 906, the UE 904 may receive information 908 from the base station 902 indicating a list of UL-SRS resources (or a list of DL-PRS resources corresponding to the list of UL-SRS resources) that the UE 904 may transmit or be configured to transmit, the list of UL-SRS resources being associated with one or more transmission properties at the UE. Receiving the information indicating the SRS resources may be implemented, for example, by the SRS resource indication process component 1640 and / or the receiving component 1630 of the apparatus 1602 in FIG. 16. In one example, the information may be received via at least one of DCI, MAC-CE, or RRC signaling.

[0164]

[0172] At 1504, the UE may transmit an SRS to one or more BSs based on one or more transmission properties, the SRS being transmitted on the indicated SRS resource(s) or on one or more SRS resources corresponding to the indicated PRS resource(s), as described with respect to Figure 9. For example, at 920, the UE 904 may transmit an SRS to the first BS 901, the second BS 903, the third BS 905, and the fourth BS 907 based on one or more transmission properties at the UE. The transmission of the SRS may be performed, for example, by the SRS transmitting component 1642 and / or the transmitting component 1634 of the apparatus 1602 in Figure 16.

[0165]

[0173] At 1506, the UE may prioritize measuring PRS received from at least one BS on one or more PRS resources in one measurement occasion after transmitting the SRS, the PRS being received based on one or more reception properties associated with the one or more transmission properties, as described with respect to FIG. 9. For example, at 925, the UE 904 may prioritize measuring DL-PRS transmitted from a first BS 901, a second BS 903, a third BS 905, and a fourth BS 907, where the UE 904 may receive the DL-PRS based on one or more reception properties associated with the one or more transmission properties. The measurement of the PRS may be performed, for example, by the PRS measurement component 1644 and / or the reception component 1630 of the apparatus 1602 in FIG. 16.

[0166]

[0174] In one example, as shown at 1508, one or more transmit properties for transmitting the SRS may be associated with at least one transmit beam and one or more receive properties for receiving the PRS may be associated with at least one receive beam, where the at least one receive beam and the at least one transmit beam may have the same set of associated beam directions.

[0167]

[0175] In another example, as shown at 1510, one or more transmit properties for the transmission of the SRS may be associated with a transmit power, and one or more receive properties for the reception of the PRS may be associated with a receive power.

[0168]

[0176] In another example, as shown at 1512, one or more transmit properties for the transmission of the SRS may be associated with a transmit timing, and one or more receive properties for the reception of the PRS may be associated with a receive timing.

[0169]

[0177] In another example, the UE may determine a time difference between transmitting the SRS and receiving the PRS, and the UE may transmit information indicating the time difference in a measurement report to at least one serving BS.

[0170]

[0178] In another example, the one or more BSs may include the at least one serving BS, or the one or more BSs may be different from the at least one serving BS.

[0171]

[0179] 16 is a diagram 1600 illustrating an example of a hardware implementation for an apparatus 1602. The apparatus 1602 is a UE and includes a cellular baseband processor 1604 (also referred to as a modem) coupled to a cellular RF transceiver 1622 and one or more subscriber identity module (SIM) cards 1620, an application processor 1606 coupled to a secure digital (SD) card 1608 and a screen 1610, a Bluetooth module 1612, a wireless local area network (WLAN) module 1614, a global positioning system (GPS) module 1616, and a power source 1618. The cellular baseband processor 1604 communicates with the UE 104 and / or the BS 102 / 180 through the cellular RF transceiver 1622. The cellular baseband processor 1604 may include a computer-readable medium / memory. The computer-readable medium / memory may be non-transitory. The cellular baseband processor 1604 is responsible for general processing, including the execution of software stored in a computer-readable medium / memory. The software, when executed by the cellular baseband processor 1604, causes the cellular baseband processor 1604 to perform the various functions described above. The computer-readable medium / memory may also be used to store data that is manipulated by the cellular baseband processor 1604 when executing the software. The cellular baseband processor 1604 further includes a receiving component 1630, a communications manager 1632, and a transmitting component 1634. The communications manager 1632 includes one or more of the illustrated components. The components in the communications manager 1632 may be stored in a computer-readable medium / memory and / or configured as hardware within the cellular baseband processor 1604. The cellular baseband processor 1604 may be a component of the UE 350 and may include the memory 360 and / or at least one of the TX processor 368, the RX processor 356, and the controller / processor 359.In one configuration, the device 1602 may be a modem chip and may only include a baseband processor 1604, and in another configuration, the device 1602 may be an entire UE (e.g., see 350 in FIG. 3) and may include the additional modules previously described for the device 1602.

[0172]

[0180] The communications manager 1632 includes an SRS resource display process component 1640 configured to receive information from at least one serving BS indicating one or more SRS resources or one or more PRS resources corresponding to the one or more SRS resources, the one or more SRS resources being associated with one or more transmission properties, e.g., as described with reference to 1502 of FIG. 15. The communications manager 1632 further includes an SRS transmission component 1642 configured to transmit an SRS to the one or more BSs based on the one or more transmission properties, the SRS being transmitted on the indicated one or more SRS resources or on one or more SRS resources corresponding to the indicated one or more PRS resources, e.g., as described with reference to 1504 of FIG. The communications manager 1632 further includes a PRS measurement component 1644 configured to prioritize measuring a PRS received from at least one BS on one or more PRS resources in a measurement occasion after transmitting an SRS, the PRS being received based on one or more receive properties associated with the one or more transmit properties, e.g., as described with respect to 1506 in FIG. 15 .

[0173]

[0181] The apparatus may include additional components that perform each of the blocks of the algorithm in the above-mentioned flowchart of Figure 15. Thus, each block in the above-mentioned flowchart of Figure 15 may be implemented by one component, and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to perform the described process / algorithm, implemented by a processor configured to perform the described process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0174]

[0182] In one configuration, the apparatus 1602, and in particular the cellular baseband processor 1604, includes means (e.g., the SRS resource indication process component 1640 and / or the receiving component 1630) for receiving information from at least one serving BS indicating one or more SRS resources or one or more PRS resources corresponding to the one or more SRS resources, the one or more SRS resources being associated with one or more transmission properties. The apparatus 1602 includes means (e.g., the SRS transmitting component 1642 and / or the transmitting component 1634) for transmitting an SRS to the one or more BSs based on the one or more transmission properties, the SRS being transmitted on the indicated one or more SRS resources or on one or more SRS resources corresponding to the indicated one or more PRS resources. The apparatus 1602 includes means (e.g., the PRS measurement component 1644 and / or the receiving component 1630) for prioritizing measuring a PRS received from at least one BS on one or more PRS resources in a measurement occasion after transmitting an SRS, the PRS being received based on one or more receiving properties associated with the one or more transmitting properties. In one configuration, the information may be received via at least one of a DCI, a MAC-CE, or an RRC signaling.

[0175]

[0183] In one configuration, one or more transmit properties for transmitting the SRS may be associated with at least one transmit beam, and one or more receive properties for receiving the PRS may be associated with at least one receive beam, where the at least one receive beam and the at least one transmit beam may have the same set of associated beam directions.

[0176]

[0184] In another configuration, the one or more transmit properties for transmission of the SRS may be associated with transmit power, and the one or more receive properties for reception of the PRS may be associated with receive power.

[0177]

[0185] In another configuration, the one or more transmit properties for transmission of the SRS may be associated with transmit timing, and the one or more receive properties for reception of the PRS may be associated with receive timing.

[0178]

[0186] In another configuration, the apparatus 1602 includes means for determining a time difference between transmitting the SRS and receiving the PRS and means for transmitting information indicating the time difference in a measurement report to the at least one serving BS.

[0179]

[0187] In another configuration, the one or more BSs may include the at least one serving BS, or the one or more BSs may be different from the at least one serving BS.

[0180]

[0188] The aforementioned means may be one or more of the aforementioned components of the apparatus 1602 configured to perform the functions recited by the aforementioned means. As described above, the apparatus 1602 may include the TX processor 368, the RX processor 356, and the controller / processor 359. Thus, in one configuration, the aforementioned means may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the aforementioned means.

[0181]

[0189] 17 is a flowchart 1700 of a method of wireless communication. The method may be performed by a base station or a component of a base station (e.g., a processing system that may include a base station 102, 180, 310, 902, a BS 604, 606, 608, 610, 901, 903, 905, 907, an apparatus 1802, a memory 376, and may be the base station 310 in its entirety or a component of the base station 310, such as a TX processor 316, a RX processor 370, and / or a controller / processor 375). Optional aspects are indicated with dashed lines. The method may enable the base station to indicate to the UE a list on which the UE may prioritize its PRS measurements based at least in part on the list of SRS resources.

[0182]

[0190] At 1702, the base station may measure SRS received from the UE on one or more SRS resources at a measurement occasion, as described with respect to Figure 9. For example, at 922, the base station 902 may measure SRS received from the UE 904 on SRS resources 910, 912, 914, and 916. The measurement of the SRS may be performed, for example, by the SRS measurement component 1840 and / or the receiving component 1830 of the apparatus 1802 in Figure 18.

[0183]

[0191] At 1704, the base station may determine a subset of the one or more SRS resources, where the subset of SRS resources corresponds to one or more reception properties at the BS, as described with respect to Figure 9. For example, at 906, the base station 902 may determine a list of SRS resources for which the UE 904 may prioritize measurements, where the list of SRS resources may correspond to one or more reception properties at the BS. The determination of the subset of SRS resources may be performed, for example, by the SRS resource selection component 1842 of the apparatus 1802 in Figure 18.

[0184]

[0192] In one example, in determining the subset of SRS resources, the base station may determine a quality metric for one or more SRS resources, and the base station may determine the subset of SRS resources based on the SRS resources in the subset having a quality metric that exceeds a threshold. In such an example, the quality metric may include at least one of the RSRP, the line-of-sight probability, or a timing delay calibration value.

[0185]

[0193] At 1706, the base station may transmit a PRS to the UE on one or more PRS resources based on one or more transmission properties at the BS, the one or more PRS resources corresponding to the determined subset of SRS resources, the one or more transmission properties associated with one or more receiving properties, as described with respect to FIG. 9. For example, at 924, a first BS 901, a second BS 903, a third BS 905, and a fourth BS 907 may transmit DL-PRS on PRS resources 926, 928, 930, 932 based on one or more transmission properties associated with the one or more receiving properties. For example, the first BS 901 may transmit a DL-PRS through at least one transmit beam at the first BS 901, where the at least one transmit beam may have the same set of associated beam directions as the at least one receive beam for receiving a corresponding SRS. The transmission of the PRS may be performed, for example, by the PRS transmitting component 1844 and / or the transmitting component 1834 of the apparatus 1802 in FIG.

[0186]

[0194] In one example, as shown in 1708, one or more receive properties for receiving an SRS may be associated with at least one receive beam and one or more transmit properties for transmitting a PRS may be associated with at least one transmit beam, where the at least one transmit beam and the at least one receive beam may have the same set of associated beam directions.

[0187]

[0195] In another example, as shown at 1710, one or more receive properties for reception of an SRS may be associated with receive power, and one or more transmit properties for transmission of a PRS may be associated with transmit power.

[0188]

[0196] In another example, as shown at 1712, one or more receive properties for reception of an SRS may be associated with receive timing, and one or more transmit properties for transmission of a PRS may be associated with transmit timing.

[0189]

[0197] In another example, the base station may transmit information to the UE indicating a subset of SRS resources or one or more PRS resources corresponding to the subset of SRS resources. In such an example, the information may be transmitted via at least one of DCI, MAC-CE, or RRC signaling. In such an example, the information may be transmitted after the SRS is measured within a configured duration of measurement of the SRS.

[0190]

[0198] FIG. 18 is a diagram 1800 illustrating an example of a hardware implementation for an apparatus 1802. The apparatus 1802 is a BS and includes a baseband unit 1804. The baseband unit 1804 may communicate with the UE 104 through a cellular RF transceiver. The baseband unit 1804 may include a computer-readable medium / memory. The baseband unit 1804 is responsible for general processing, including the execution of software stored in the computer-readable medium / memory. The software, when executed by the baseband unit 1804, causes the baseband unit 1804 to perform various functions described above. The computer-readable medium / memory may also be used to store data that is manipulated by the baseband unit 1804 when executing the software. The baseband unit 1804 further includes a receiving component 1830, a communication manager 1832, and a transmitting component 1834. The communication manager 1832 includes one or more of the illustrated components. The components in the communications manager 1832 may be stored in a computer-readable medium / memory and / or configured as hardware in the baseband unit 1804. The baseband unit 1804 may be a component of the BS 310 and may include the memory 376 and / or at least one of the TX processor 316, the RX processor 370, and the controller / processor 375.

[0191]

[0199] The communications manager 1832 includes an SRS measurement component 1840 configured to measure an SRS received from the UE on one or more SRS resources at a measurement occasion, e.g., as described with respect to 1702 of FIG. 17. The communications manager 1832 further includes an SRS resource selection component 1842 configured to determine a subset of the one or more SRS resources, the subset of SRS resources corresponding to one or more reception properties at the BS, e.g., as described with respect to 1704 of FIG. 17. The communications manager 1832 further includes a PRS transmission component 1844 configured to transmit a PRS to the UE on one or more PRS resources based on one or more transmission properties at the BS, the one or more PRS resources corresponding to the determined subset of SRS resources, the one or more transmission properties being associated with the one or more reception properties, e.g., as described with respect to 1706 of FIG.

[0192]

[0200] The apparatus may include additional components that perform each of the blocks of the algorithm in the above-mentioned flowchart of Figure 17. Thus, each block in the above-mentioned flowchart of Figure 17 may be implemented by one component, and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to perform the described process / algorithm, implemented by a processor configured to perform the described process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0193]

[0201] In one configuration, the apparatus 1802, and in particular the baseband unit 1804, includes means for measuring an SRS received from a UE on one or more SRS resources at a measurement occasion (e.g., an SRS measurement component 1840 and / or a receiving component 1830). The apparatus 1802 includes means for determining a subset of the SRS resources of the one or more SRS resources, the subset of the SRS resources corresponding to one or more receiving properties at the BS (e.g., an SRS resource selection component 1842). The apparatus 1802 includes means for transmitting a PRS to the UE on one or more PRS resources based on one or more transmitting properties at the BS, the one or more PRS resources corresponding to the determined subset of SRS resources, the one or more transmitting properties being associated with the one or more receiving properties (e.g., a PRS transmission component 1844 and / or a transmitting component 1834).

[0194]

[0202] In one configuration, in determining the subset of SRS resources, the apparatus 1802 includes means for determining a quality metric for one or more SRS resources and means for determining the subset of SRS resources based on SRS resources in the subset having a quality metric that exceeds a threshold. In such a configuration, the quality metric may include at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0195]

[0203] In another configuration, one or more receive properties for receiving an SRS may be associated with at least one receive beam, and one or more transmit properties for transmitting a PRS may be associated with at least one transmit beam, where the at least one transmit beam and the at least one receive beam may have the same set of associated beam directions.

[0196]

[0204] In another configuration, the one or more receive properties for reception of the SRS may be associated with receive power, and the one or more transmit properties for transmission of the PRS may be associated with transmit power.

[0197]

[0205] In another configuration, the one or more receive properties for reception of the SRS may be associated with receive timing, and the one or more transmit properties for transmission of the PRS may be associated with transmit timing.

[0198]

[0206] In another configuration, the apparatus 1802 includes means for transmitting, to the UE, information indicating a subset of SRS resources or one or more PRS resources corresponding to the subset of SRS resources. In such a configuration, the information may be transmitted via at least one of DCI, MAC-CE, or RRC signaling. In such a configuration, the information may be transmitted after the SRS is measured within a configured duration of measurement of the SRS.

[0199]

[0207] The aforementioned means may be one or more of the aforementioned components of the apparatus 1802 configured to perform the functions recited by the aforementioned means. As described above, the apparatus 1802 may include the TX processor 316, the RX processor 370, and the controller / processor 375. Thus, in one configuration, the aforementioned means may be the TX processor 316, the RX processor 370, and the controller / processor 375 configured to perform the functions recited by the aforementioned means.

[0200]

[0208] The following examples described in additional aspects are illustrative only and not limiting, and those aspects may be combined with aspects of other embodiments or teachings described herein.

[0201]

[0209] Aspect 1 is an apparatus for wireless communication in a UE, the apparatus including: a memory; a transceiver; and a processor communicatively coupled to the memory and the transceiver, the processor configured to: determine an association between one or more reception properties of one or more PRS resources and one or more transmission properties of one or more SRS resources; transmit information to at least one serving BS indicating one or more PRS resources that the UE is configured to measure in future measurement occasions; measure PRS received from one or more BSs on the one or more PRS resources based on the one or more reception properties; and transmit an SRS on the one or more SRS resources to the one or more BSs after measuring the PRS based on the one or more transmission properties.

[0202]

[0210] In aspect 2, the apparatus of aspect 1 further includes: one or more receive properties for receiving the PRS are associated with at least one receive beam; and one or more transmit properties for transmitting the SRS are associated with at least one transmit beam; and the at least one receive beam and the at least one transmit beam have the same set of associated beam directions.

[0203]

[0211] In aspect 3, the apparatus of aspect 1 or aspect 2 further includes that the one or more receive properties for reception of the PRS are associated with receive power, and the one or more transmit properties for transmission of the SRS are associated with transmit power.

[0204]

[0212] In aspect 4, the apparatus of any of aspects 1 to 3 further includes: one or more receiving properties for receiving the PRS are associated with a receiving timing; and one or more transmitting properties for transmitting the SRS are associated with a transmitting timing.

[0205]

[0213] In example 5, the apparatus of any of examples 1-4 further includes that the information is transmitted via at least one of UCI, MAC-CE, or RRC signaling.

[0206]

[0214] In example 6, the apparatus of any of examples 1-5 further includes: the one or more BSs includes at least one serving BS.

[0207]

[0215] In example 7, the apparatus of any of examples 1-6 further includes, wherein the one or more BSs are different from the at least one serving BS.

[0208]

[0216] In example 8, the apparatus of any of examples 1 to 7 further includes the information indicating the one or more PRS resources being transmitted before the PRS is measured and indicating the one or more PRS resources that the UE intends to measure.

[0209]

[0217] In aspect 9, the apparatus of any of aspects 1 to 8 further includes that the processor is further configured to determine that a quality metric for one or more PRS resources exceeds a threshold in a previous measurement occasion, where the information indicates the one or more PRS resources having a quality metric that exceeds the threshold.

[0210]

[0218] In example 10, the apparatus of any of examples 1-9 further includes: the quality metric includes at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0211]

[0219] In example 11, the apparatus of any of examples 1 to 10 further includes: the information indicating the one or more PRS resources is transmitted after the PRS is measured and indicates a subset of the one or more PRS resources measured by the UE.

[0212]

[0220] In aspect 12, the apparatus of any of aspects 1 to 11 further includes that the processor is further configured to determine a quality metric for one or more PRS resources and determine a subset of the one or more PRS resources having a quality metric that exceeds a threshold, where the information indicates the subset of the one or more PRS resources having a quality metric that exceeds the threshold.

[0213]

[0221] In example 13, the apparatus of any of examples 1-12 further includes: the quality metric includes at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0214]

[0222] In example 14, the apparatus of any of examples 1-13 further includes, the information being transmitted before or after the PRS is measured within a configured duration of measurement of the PRS.

[0215]

[0223] In example 15, any of examples 1-14 further includes: the UE autonomously determining one or more PRS resources that the UE is configured to measure from the set of PRS resources, the one or more PRS resources being a subset of the set of PRS resources.

[0216]

[0224] Aspect 16 is a method of wireless communication in a UE, the method including: determining an association between one or more receive properties of one or more PRS resources and one or more transmit properties of one or more SRS resources; transmitting, to at least one serving BS, information indicating one or more PRS resources that the UE is configured to measure in future measurement occasions; measuring PRS received from one or more BSs on the one or more PRS resources based on the one or more receive properties; and transmitting an SRS on the one or more SRS resources to the one or more BSs after measuring the PRS based on the one or more transmit properties.

[0217]

[0225] In aspect 17, the method of aspect 16 further includes: one or more receive properties for receiving the PRS are associated with at least one receive beam; and one or more transmit properties for transmitting the SRS are associated with at least one transmit beam; and the at least one receive beam and the at least one transmit beam have the same set of associated beam directions.

[0218]

[0226] In aspect 18, the method of aspect 16 or aspect 17 further includes that the one or more reception properties for reception of the PRS are associated with reception power, and the one or more transmission properties for transmission of the SRS are associated with transmission power.

[0219]

[0227] In example 19, the method of any of examples 16 to 18 further includes: one or more receiving properties for receiving the PRS are associated with a receiving timing; and one or more transmitting properties for transmitting the SRS are associated with a transmitting timing.

[0220]

[0228] In example 20, the method of any of examples 16-19 further includes transmitting the information via at least one of UCI, MAC-CE, or RRC signaling.

[0221]

[0229] In example 21, the method of any of examples 16-20 further includes: the one or more BSs includes at least one serving BS.

[0222]

[0230] In example 22, the method of any of examples 16-21 further includes: the one or more BSs are different from the at least one serving BS.

[0223]

[0231] In example 23, the method of any of examples 16 to 22 further includes the information indicating the one or more PRS resources being transmitted before the PRS is measured and indicating the one or more PRS resources that the UE intends to measure.

[0224]

[0232] In embodiment 24, the method of any of embodiments 16 to 23 further includes determining that a quality metric for one or more PRS resources exceeds a threshold in a previous measurement occasion, where the information indicates the one or more PRS resources having a quality metric that exceeds the threshold.

[0225]

[0233] In example 25, the method of any of examples 16-24 further includes, the quality metric includes at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0226]

[0234] In example 26, the method of any of examples 16 to 25 further includes: the information indicating the one or more PRS resources is transmitted after the PRS is measured and indicates a subset of the one or more PRS resources measured by the UE.

[0227]

[0235] In example 27, the method of any of examples 16-26 further includes determining a quality metric for one or more PRS resources and determining a subset of the one or more PRS resources having a quality metric that exceeds a threshold, where the information indicates the subset of the one or more PRS resources having a quality metric that exceeds the threshold.

[0228]

[0236] In example 28, the method of any of examples 16-27 further includes, the quality metric includes at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0229]

[0237] In example 29, the method of any of examples 16-28 further includes transmitting the information before or after measuring the PRS within a configured duration of measurement of the PRS.

[0230]

[0238] In aspect 30, any of aspects 16-29 further includes: the UE autonomously determining one or more PRS resources that the UE is configured to measure from the set of PRS resources, the one or more PRS resources being a subset of the set of PRS resources.

[0231]

[0239] Example 31 is an apparatus for wireless communication including means for implementing the method according to any of Examples 16 to 30.

[0232]

[0240] Aspect 32 is a non-transitory computer-readable medium storing computer-executable code, where the code, when executed by a processor, causes the processor to implement a method according to any of aspects 16 to 30.

[0233]

[0241] Aspect 33 is a method of wireless communication in a BS, the method including receiving information from a UE indicating one or more PRS resources that the UE is configured to measure or has measured in a measurement occasion, transmitting a PRS on the indicated one or more PRS resources based on one or more transmission properties, receiving an SRS from the UE after transmitting the PRS on one or more SRS resources based on one or more reception properties associated with the one or more transmission properties, and measuring the received SRS on the one or more SRS resources corresponding to the indicated one or more PRS resources.

[0234]

[0242] In aspect 34, the method of aspect 33 further includes: one or more transmit properties for transmitting the PRS are associated with at least one transmit beam; and one or more receive properties for receiving the SRS are associated with at least one receive beam; and the at least one transmit beam and the at least one receive beam have the same set of associated beam directions.

[0235]

[0243] In aspect 35, the method of aspect 33 or aspect 34 further includes that the one or more transmission properties for transmitting the PRS are associated with a transmission power, and the one or more reception properties for receiving the SRS are associated with a reception power.

[0236]

[0244] In embodiment 36, the method of any of embodiments 33 to 35 further includes: one or more transmit properties for transmitting the PRS are associated with transmit timing; and one or more receive properties for receiving the SRS are associated with receive timing.

[0237]

[0245] In example 37, the method of any of examples 33-36 further includes that the information is received via at least one of UCI, MAC-CE, or RRC signaling.

[0238]

[0246] In example 38, the method of any of examples 33-37 further includes determining at least one RTT associated with the transmitted PRS and the measured SRS.

[0239]

[0247] In example 39, the method of any of examples 33-38 further includes sending the received information indicating the one or more PRS resources to at least one other BS.

[0240]

[0248] In example 40, the method of any of examples 33-39 further includes: the information indicating the one or more PRS resources is received from the UE via at least one other BS.

[0241]

[0249] In example 41, the method of any of examples 33-40 further includes: the information indicating the one or more PRS resources is received before the PRS is transmitted.

[0242]

[0250] In example 42, the method of any of examples 33-41 further includes: the information indicating the one or more PRS resources is received after the PRS is transmitted.

[0243]

[0251] In example 43, the method of any of examples 33-42 further includes that the information is received before or after the PRS is transmitted within a configured duration of transmission of the PRS.

[0244]

[0252] Example 44 is an apparatus for wireless communication including at least one processor coupled to a memory and configured to implement a method according to any of examples 33 to 43.

[0245]

[0253] Example 45 is an apparatus for wireless communication including means for implementing the method of any of Examples 33 to 43.

[0246]

[0254] Aspect 46 is a non-transitory computer-readable medium storing computer-executable code, which when executed by a processor causes the processor to implement a method according to any of aspects 33 to 43.

[0247]

[0255]

[0036] Aspect 47 is an apparatus for wireless communication in a UE, the apparatus including: a memory; a transceiver; and a processor communicatively coupled to the memory and the transceiver, the processor configured to: receive information from at least one serving BS indicating one or more SRS resources or one or more PRS resources corresponding to the one or more SRS resources; the one or more SRS resources are associated with one or more transmission properties; transmit an SRS to the one or more BSs based on the one or more transmission properties; the SRS is transmitted on the indicated one or more SRS resources or on the one or more SRS resources corresponding to the indicated one or more PRS resources; after transmitting the SRS, prioritize measuring a PRS received from the at least one BS on the one or more PRS resources in one measurement occasion; and the PRS is received based on one or more reception properties associated with the one or more transmission properties.

[0248]

[0256] In aspect 48, the apparatus of aspect 47 further includes: one or more transmit properties for transmitting the SRS are associated with at least one transmit beam; and one or more receive properties for receiving the PRS are associated with at least one receive beam; and the at least one receive beam and the at least one transmit beam have the same set of associated beam directions.

[0249]

[0257] In aspect 49, the apparatus of aspect 47 or aspect 48 further includes that the one or more transmit properties for transmitting the SRS are associated with a transmit power, and the one or more receive properties for receiving the PRS are associated with a receive power.

[0250]

[0258] In embodiment 50, the apparatus of any of embodiments 47 to 49 further includes, wherein the one or more transmit properties for transmitting the SRS are associated with a transmit timing, and the one or more receive properties for receiving the PRS are associated with a receive timing.

[0251]

[0259] In example 51, the apparatus of any of examples 47-50 further includes that the information is received via at least one of DCI, MAC-CE, or RRC signaling.

[0252]

[0260] In aspect 52, the apparatus of any of aspects 47 to 51 further includes that the processor is further configured to determine a time difference between transmitting the SRS and receiving the PRS, and to transmit information indicating the time difference in a measurement report to at least one serving BS.

[0253]

[0261] In example 53, the apparatus of any of examples 47-52 further includes that the one or more BSs include at least one serving BS.

[0254]

[0262] In example 54, the apparatus of any of examples 47-53 further includes, wherein the one or more BSs are different from the at least one serving BS.

[0255]

[0263] Aspect 55 is a method of wireless communication in a UE, the method including: receiving information from at least one serving BS indicating one or more SRS resources or one or more PRS resources corresponding to the one or more SRS resources; the one or more SRS resources being associated with one or more transmission properties; transmitting an SRS to the one or more BSs based on the one or more transmission properties; the SRS being transmitted on the indicated one or more SRS resources or on one or more SRS resources corresponding to the indicated one or more PRS resources; prioritizing measuring a PRS received from the at least one BS on the one or more PRS resources in one measurement occasion after transmitting the SRS; the PRS being received based on one or more reception properties associated with the one or more transmission properties.

[0256]

[0264] In aspect 56, the method of aspect 55 further includes: one or more transmit properties for transmitting the SRS are associated with at least one transmit beam; and one or more receive properties for receiving the PRS are associated with at least one receive beam; and the at least one receive beam and the at least one transmit beam have the same set of associated beam directions.

[0257]

[0265] In aspect 57, the method of aspect 55 or aspect 56 further includes that the one or more transmission properties for transmitting the SRS are associated with a transmission power, and the one or more reception properties for receiving the PRS are associated with a reception power.

[0258]

[0266] In embodiment 58, the method of any of embodiments 55 to 57 further includes: one or more transmit properties for transmitting the SRS are associated with transmit timing; and one or more receive properties for receiving the PRS are associated with receive timing.

[0259]

[0267] In example 59, the method of any of examples 55-58 further includes that the information is received via at least one of DCI, MAC-CE, or RRC signaling.

[0260]

[0268] In example 60, the method of any of examples 55 to 59 further includes determining a time difference between transmitting the SRS and receiving the PRS, and transmitting information indicating the time difference in a measurement report to at least one serving BS.

[0261]

[0269] In example 61, the method of any of examples 55-60 further includes: the one or more BSs includes at least one serving BS.

[0262]

[0270] In example 62, the method of any of examples 55-61 further includes: the one or more BSs are different from the at least one serving BS.

[0263]

[0271] Example 63 is an apparatus for wireless communication, comprising means for implementing the method of any of Examples 55 to 62.

[0264]

[0272] Aspect 64 is a non-transitory computer-readable medium storing computer-executable code, which when executed by a processor causes the processor to implement a method according to any of aspects 55 to 62.

[0265]

[0273] Aspect 65 is a method of wireless communication at a BS, the method including: measuring an SRS received from a UE on one or more SRS resources at a measurement occasion; determining a subset of the SRS resources of the one or more SRS resources, the subset of the SRS resources corresponding to one or more reception properties at the BS; transmitting a PRS on one or more PRS resources to the UE based on one or more transmission properties at the BS, the one or more PRS resources corresponding to the determined subset of SRS resources, the one or more transmission properties being associated with the one or more reception properties.

[0266]

[0274] In aspect 66, the method of aspect 65 further includes: one or more receive properties for receiving the SRS are associated with at least one receive beam; and one or more transmit properties for transmitting the PRS are associated with at least one transmit beam; and the at least one transmit beam and the at least one receive beam have the same set of associated beam directions.

[0267]

[0275] In aspect 67, the method of aspect 65 or aspect 66 further includes that the one or more receiving properties for receiving the SRS are associated with a receiving power, and the one or more transmitting properties for transmitting the PRS are associated with a transmitting power.

[0268]

[0276] In embodiment 68, the method of any of embodiments 65 to 67 further includes: one or more receiving properties for receiving the SRS are associated with a receiving timing; and one or more transmitting properties for transmitting the PRS are associated with a transmitting timing.

[0269]

[0277] In example 69, the method of any of examples 65-68 further includes transmitting, to the UE, information indicating the subset of SRS resources or one or more PRS resources corresponding to the subset of SRS resources.

[0270]

[0278] In example 70, the method of any of examples 65-69 further includes the information being transmitted via at least one of DCI, MAC-CE, or RRC signaling.

[0271]

[0279] In example 71, the method of any of examples 65-70 further includes the information being transmitted after the SRS is measured within a configured duration of the SRS measurement.

[0272]

[0280] In example 72, the method of any of examples 65 to 71 further includes that determining the subset of SRS resources includes determining a quality metric for one or more SRS resources and determining the subset of SRS resources based on SRS resources in the subset having a quality metric that exceeds a threshold.

[0273]

[0281] In embodiment 73, the method of any of embodiments 65-72 further includes, the quality metric includes at least one of an RSRP, a line-of-sight probability, or a timing delay calibration value.

[0274]

[0282]

[0031] Aspect 74 is an apparatus for wireless communication including at least one processor coupled to a memory and configured to implement a method as recited in any of aspects 65 to 73.

[0275]

[0283] Example 75 is an apparatus for wireless communication, comprising means for implementing the method of any of examples 65 to 73.

[0276]

[0284] Aspect 76 is a non-transitory computer-readable medium storing computer-executable code, which when executed by a processor causes the processor to implement a method according to any of aspects 65 to 73.

[0277]

[0285] It is understood that the particular order or hierarchy of the blocks in the disclosed processes / flowcharts is an example of an example approach. Based on design preferences, it is understood that the particular order or hierarchy of the blocks in the processes / flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in an example order, and are not limited to the particular order or hierarchy presented.

[0278]

[0286] The above description is provided to enable those skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Thus, the claims are not limited to the aspects set forth herein, but are to be accorded the widest scope consistent with the claim language, in which reference to an element in the singular does not mean "one and only," unless so expressly stated, but rather means "one or more." Terms such as "if," "when," and "while" should be construed to mean "under the condition that," rather than implying an immediate time relationship or reaction. That is, these phrases, for example, "when," do not imply an immediate action in response to or during the occurrence of an action, but merely imply that if a condition is met, an action occurs, but does not require a specific or immediate time constraint for the action to occur. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects. Unless otherwise specified, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," "one or more of A, B, and C," and "A, B, C, or any combination thereof" include any combination of A, B, and / or C, and may include multiple As, multiple Bs, or multiple Cs.Specifically, combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," "one or more of A, B, and C," and "A, B, C, or any combination thereof" may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combination may include one or more members of A, B, or C. All structural and functional equivalents to the elements of the various embodiments described throughout this disclosure will be known or will later become known to those skilled in the art and are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is made public, regardless of whether such disclosure is expressly recited in the claims. The words "module," "mechanism," "element," "device," and the like may not be substitutes for the word "means." Therefore, no claim element should be construed as a means-plus-function unless the element is expressly recited using the phrase "means for."

Claims

1. 1. A method of wireless communication in a user equipment (UE), comprising: determining an association between one or more reception properties of one or more positioning reference signal (PRS) resources and one or more transmission properties of one or more sounding reference signal (SRS) resources; transmitting to at least one serving base station (BS) information indicating the one or more PRS resources that the UE is configured to measure in future measurement occasions; based on the information, measuring PRS received from one or more BSs on the one or more PRS resources based on the one or more reception properties; transmitting an SRS on the one or more SRS resources based on the one or more transmission properties to the one or more BSs after measuring the PRS; A method comprising:

2. 2. The method of claim 1, wherein the one or more receive properties for the reception of the PRS are associated with at least one receive beam and the one or more transmit properties for the transmission of the SRS are associated with at least one transmit beam, the at least one receive beam and the at least one transmit beam having the same set of associated beam directions.

3. The method of claim 1 , wherein the one or more receive properties for the reception of the PRS are associated with a receive power, and the one or more transmit properties for the transmission of the SRS are associated with a transmit power.

4. The method of claim 1 , wherein the one or more reception properties for the reception of the PRS are associated with a reception timing, and the one or more transmission properties for the transmission of the SRS are associated with a transmission timing.

5. 2. The method of claim 1, wherein the information is transmitted via at least one of uplink control information (UCI), medium access control (MAC) control element (CE) (MAC-CE), or radio resource control (RRC) signaling.

6. The method of claim 1 , wherein the one or more BSs comprise the at least one serving BS.

7. An apparatus for wireless communication in a user equipment (UE), comprising: means for determining an association between one or more reception properties of one or more positioning reference signal (PRS) resources and one or more transmission properties of one or more sounding reference signal (SRS) resources; means for transmitting, to at least one serving base station (BS), information indicating the one or more PRS resources that the UE is configured to measure in future measurement occasions; means for measuring PRS received from one or more BSs on the one or more PRS resources based on the one or more reception properties based on the information; means for transmitting an SRS on the one or more SRS resources based on the one or more transmission properties to the one or more BSs after measuring the PRS; An apparatus comprising:

8. The apparatus of claim 7, further comprising means for performing a method according to any one of claims 2 to 6.

9. 7. A non-transitory computer readable medium storing computer executable code in a user equipment (UE), the code, when executed by a processor, causing the processor to perform a method according to any one of claims 1 to 6.

10. 1. A method of wireless communication in a user equipment (UE), comprising: receiving information from at least one serving base station (BS) indicating one or more sounding reference signal (SRS) resources or one or more position reference signal (PRS) resources corresponding to the one or more SRS resources, the one or more SRS resources being associated with one or more transmission properties; transmitting an SRS to one or more BSs based on the one or more transmission properties, wherein the SRS is transmitted on the indicated one or more SRS resources or on the one or more SRS resources corresponding to the indicated one or more PRS resources. prioritizing measuring a PRS received from the at least one BS on the one or more PRS resources in a measurement occasion after transmitting the SRS, the PRS being received based on one or more receive properties associated with the one or more transmit properties. A method comprising:

11. 11. The method of claim 10, wherein the one or more transmit properties for the transmission of the SRS are associated with at least one transmit beam and the one or more receive properties for the reception of the PRS are associated with at least one receive beam, the at least one receive beam and the at least one transmit beam having the same set of associated beam directions.

12. The method of claim 10 , wherein the one or more transmit properties for the transmission of the SRS are associated with a transmit power, and the one or more receive properties for the reception of the PRS are associated with a receive power.

13. An apparatus for wireless communication in a user equipment (UE), comprising: means for receiving information from at least one serving base station (BS) indicating one or more Sounding Reference Signal (SRS) resources or one or more Position Reference Signal (PRS) resources corresponding to the one or more SRS resources, the one or more SRS resources being associated with one or more transmission properties; means for transmitting an SRS to one or more BSs based on the one or more transmission properties, the SRS being transmitted on the indicated one or more SRS resources or on the one or more SRS resources corresponding to the indicated one or more PRS resources. means for prioritizing measuring a PRS received from the at least one BS on the one or more PRS resources in a measurement occasion after transmitting the SRS, the PRS being received based on one or more receive properties associated with the one or more transmit properties. An apparatus comprising:

14. The apparatus of claim 13, further comprising means for performing the method of claim 11 or 12.

15. 13. A computer readable medium storing computer executable code in a user equipment (UE), the code, when executed by a processor, causing the processor to perform the method of any one of claims 10 to 12.

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