WO2025255697A1

WO2025255697A1 - Reporting user equipment measurements

Info

Publication number: WO2025255697A1
Application number: PCT/CN2024/098348
Authority: WO
Inventors: Jing Dai; Xiaoxia Zhang; Peter Gaal; Mostafa KHOSHNEVISAN; Shaozhen GUO
Original assignee: Qualcomm Inc
Current assignee: Qualcomm Inc
Priority date: 2024-06-11
Filing date: 2024-06-11
Publication date: 2025-12-18
Anticipated expiration: 2026-12-11

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a transmission reception point (TRP), a sounding reference signal (SRS). The UE may receive, from the TRP, a channel state information reference signal (CSI-RS), wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS. The UE may report a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS. Numerous other aspects are described.

Description

REPORTING USER EQUIPMENT MEASUREMENTS

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods for user equipment measurement and reporting depending on whether a received channel state information reference signal is precoded.

BACKGROUND

Wireless communication systems are widely deployed to provide various services that may include carrying voice, text, messaging, video, data, and/or other traffic. The services may include unicast, multicast, and/or broadcast services, among other examples. Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication with multiple users by sharing available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, and/or device transmit power, among other examples) . Examples of such multiple-access RATs 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.

The above multiple-access RATs have been adopted in various telecommunication standards to provide common protocols that enable different wireless communication devices to communicate on a municipal, national, regional, or global level. An example telecommunication standard is New Radio (NR) . NR, which may also be referred to as 5G, is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) . NR (and other mobile broadband evolutions beyond NR) may be designed to better support Internet of things (IoT) and reduced capability device deployments, industrial connectivity, millimeter wave (mmWave) expansion, licensed and unlicensed spectrum access, non-terrestrial network (NTN) deployment, sidelink and other device-to-device direct communication technologies (for example, cellular vehicle-to-everything (CV2X) communication) , massive multiple-input multiple-output (MIMO) , disaggregated network architectures and network topology expansions, multiple-subscriber implementations, high-precision positioning, and/or radio frequency (RF) sensing, among other examples. As the demand for mobile broadband access continues to increase, further improvements in NR may be implemented, and other radio access technologies such as 6G may be introduced, to further advance mobile broadband evolution.

BRIEF DESCRIPTION OF THE DRAWINGS

The appended drawings illustrate some aspects of the present disclosure, but are not limiting of the scope of the present disclosure because the description may enable other aspects. Each of the drawings is provided for purposes of illustration and description, and not as a definition of the limits of the claims. The same or similar reference numbers in different drawings may identify the same or similar elements.

Fig. 1 is a diagram illustrating an example of a wireless network, in accordance with the present disclosure.

Fig. 2 is a diagram illustrating an example of a network node in communication with a user equipment (UE) in a wireless network, in accordance with the present disclosure.

Fig. 3 is a diagram illustrating an example disaggregated base station architecture, in accordance with the present disclosure.

Fig. 4 is a diagram illustrating an example of a precoded channel state information reference signal (CSI-RS) in which a channel is canceled, in accordance with the present disclosure.

Fig. 5 is a diagram illustrating an example of a precoded CSI-RS in which a channel is canceled and with respect to multiple UE antennas or transceivers, in accordance with the present disclosure.

Fig. 6 is a diagram illustrating an example of a normal CSI-RS in which a channel is not canceled, in accordance with the present disclosure.

Figs. 7-8 are diagrams illustrating examples associated with performing measurements and reporting depending on whether a received CSI-RS is precoded, in accordance with the present disclosure.

Figs. 9-12 are diagrams illustrating example processes associated with performing measurements and reporting depending on whether a received CSI-RS is precoded, in accordance with the present disclosure.

Figs. 13-14 are diagrams of example apparatuses for wireless communication, in accordance with the present disclosure.

SUMMARY

In some implementations, a method of wireless communication performed by a user equipment (UE) includes transmitting, to a transmission reception point (TRP) , a sounding reference signal (SRS) ; receiving, from the TRP, a channel state information reference signal (CSI-RS) , wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and reporting a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In some implementations, a method of wireless communication performed by a UE includes transmitting, to a TRP, an SRS; receiving, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and transmitting, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

In some implementations, a method of wireless communication performed by a network node includes receiving, via a TRP associated with the network node, an SRS; transmitting, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receiving, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a UE measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In some implementations, a method of wireless communication performed by a network node includes receiving, via a TRP associated with the network node, an SRS; transmitting, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receiving, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

In some implementations, an apparatus for wireless communication at a UE includes one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the UE to: transmit, to a TRP, an SRS; receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and report a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In some implementations, an apparatus for wireless communication at a UE includes one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the UE to: transmit, to a TRP, an SRS; receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and transmit, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

In some implementations, an apparatus for wireless communication at a network node includes one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the network node to: receive, via a TRP associated with the network node, an SRS; transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receive, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a UE measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In some implementations, an apparatus for wireless communication at a network node includes one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the network node to: receive, via a TRP associated with the network node, an SRS; transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receive, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

In some implementations, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: transmit, to a TRP, an SRS; receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and report a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In some implementations, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: transmit, to a TRP, an SRS; receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and transmit, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

In some implementations, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a network node, cause the network node to:receive, via a TRP associated with the network node, an SRS; transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receive, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a UE measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In some implementations, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a network node, cause the network node to:receive, via a TRP associated with the network node, an SRS; transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receive, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

In some implementations, an apparatus for wireless communication includes means for transmitting, to a TRP, an SRS; means for receiving, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and means for reporting a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In some implementations, an apparatus for wireless communication includes means for transmitting, to a TRP, an SRS; means for receiving, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and means for transmitting, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

In some implementations, an apparatus for wireless communication includes means for receiving, via a TRP associated with the apparatus, an SRS; means for transmitting, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and means for receiving, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a UE measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In some implementations, an apparatus for wireless communication includes means for receiving, via a TRP associated with the apparatus, an SRS; means for transmitting, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and means for receiving, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

Aspects of the present disclosure may generally be implemented by or as a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, network node, network entity, wireless communication device, and/or processing system as substantially described with reference to, and as illustrated by, the specification and accompanying drawings.

The foregoing paragraphs of this section have broadly summarized some aspects of the present disclosure. These and additional aspects and associated advantages will be described hereinafter. The disclosed aspects may be used as a basis for modifying or designing other aspects for carrying out the same or similar purposes of the present disclosure. Such equivalent aspects do not depart from the scope of the appended claims. Characteristics of the aspects disclosed herein, both their organization and method of operation, together with associated advantages, will be better understood from the following description when considered in connection with the accompanying drawings.

DETAILED DESCRIPTION

Various aspects of the present disclosure are described hereinafter with reference to the accompanying drawings. However, aspects of the present disclosure may be embodied in many different forms and is not to be construed as limited to any specific aspect illustrated by or described with reference to an accompanying drawing or otherwise presented in this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. One skilled in the art may appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using various combinations or quantities of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover an apparatus having, or a method that is practiced using, other structures and/or functionalities in addition to or other than the structures and/or functionalities with which various aspects of the disclosure set forth herein may be practiced. Any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented with reference to various methods, operations, apparatuses, and techniques. These methods, operations, apparatuses, and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, or algorithms (collectively referred to as “elements” ) . These elements may be implemented using hardware, software, or a combination of hardware and software. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

In a time division duplexing (TDD) system, a sounding reference signal (SRS) sounding for a downlink channel measurement may be based at least in part on a reciprocity. However, for distributed transmission reception points (TRPs) (e.g., where a network node is associated with multiple TRPs) , a measured uplink channel via an SRS and a downlink channel for a potential physical downlink shared channel (PDSCH) may suffer from a transmit (Tx) and/or receive (Rx) misalignment. The Tx/Rx misalignment may be associated with a lack of channel reciprocity. The Tx/Rx misalignment may be in terms of a timing offset and/or a phase offset. A TRP synchronization for TDD may be used to mitigate the Tx/Rx misalignment. During the TRP synchronization for TDD, a user equipment (UE) may transmit, to each TRP, an SRS, and each TRP may transmit a CSI-RS to the UE. Depending on the CSI-RS, the UE may perform measurements and report the measurements to one of the TRPs, which may be used by the one TRP to synchronize with the other TRP. The CSI-RS may be precoded or not precoded, depending on a scheme used to mitigate the Tx/Rx misalignment. Depending on whether or not the CSI-RS is precoded, the UE may alter its measurement behavior and report content. However, the UE may be unaware of whether the CSI-RS is precoded or not precoded, which may cause a UE measurement behavior and report content to be inadequate to allow for TRP synchronization, which may degrade an overall system performance.

Various aspects relate generally to UE measurement behavior and reporting depending on whether a received reference signal is precoded. Some aspects more specifically relate to UE measurement behavior and reporting depending on whether a received CSI-RS is precoded. In some examples, a UE may transmit, to a TRP, an SRS. The UE may receive, from the TRP, a CSI-RS. The CSI-RS may be a precoded CSI-RS based at least in part on the SRS, or the CSI-RS may be a non-precoded CSI-RS. The UE may identify a report configuration, where the UE may be implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration. The UE may identify a plurality of configured CSI-RS measurement resources, where the UE may be implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources. The UE may receive, from the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS. The UE may perform a UE measurement behavior and report, to the TRP, measurement results based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, by implicitly or explicitly having the UE configured to determine whether the CSI-RS is precoded or not precoded, the described techniques can be used by the UE to adjust its measurement behavior and report content. The UE may adjust its measurement behavior and report content based at least in part on an implicit indication or an explicit indication of whether the CSI-RS is precoded or not precoded. Since whether the CSI-RS is precoded or not precoded may be up to a network implementation, the UE may not control whether the CSI-RS is precoded or not precoded. By properly performing measurements of the CSI-RS, depending on whether the CSI-RS is precoded or not precoded, and by including appropriate report content, depending on whether the CSI-RS is precoded or not precoded, a network may receive proper information to enable a synchronization between TRPs, thereby improving an overall system performance.

Multiple-access radio access technologies (RATs) have been adopted in various telecommunication standards to provide common protocols that enable wireless communication devices to communicate on a municipal, enterprise, national, regional, or global level. For example, 5G New Radio (NR) is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) . 5G NR supports various technologies and use cases including enhanced mobile broadband (eMBB) , ultra-reliable low-latency communication (URLLC) , massive machine-type communication (mMTC) , millimeter wave (mmWave) technology, beamforming, network slicing, edge computing, Internet of Things (IoT) connectivity and management, and network function virtualization (NFV) .

As the demand for broadband access increases and as technologies supported by wireless communication networks evolve, further technological improvements may be adopted in or implemented for 5G NR or future RATs, such as 6G, to further advance the evolution of wireless communication for a wide variety of existing and new use cases and applications. Such technological improvements may be associated with new frequency band expansion, licensed and unlicensed spectrum access, overlapping spectrum use, small cell deployments, non-terrestrial network (NTN) deployments, disaggregated network architectures and network topology expansion, device aggregation, advanced duplex communication, sidelink and other device-to-device direct communication, IoT (including passive or ambient IoT) networks, reduced capability (RedCap) UE functionality, industrial connectivity, multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, and/or artificial intelligence or machine learning (AI/ML) , among other examples. These technological improvements may support use cases such as wireless backhauls, wireless data centers, extended reality (XR) and metaverse applications, meta services for supporting vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, vehicle platooning and cooperative maneuvering, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage applications using non-terrestrial and/or aerial platforms, among other examples. The methods, operations, apparatuses, and techniques described herein may enable one or more of the foregoing technologies and/or support one or more of the foregoing use cases.

Fig. 1 is a diagram illustrating an example of a wireless communication network 100, in accordance with the present disclosure. The wireless communication network 100 may be or may include elements of a 5G (or NR) network or a 6G network, among other examples. The wireless communication network 100 may include multiple network nodes 110, shown as a network node (NN) 110a, a network node 110b, a network node 110c, and a network node 110d. The network nodes 110 may support communications with multiple UEs 120, shown as a UE 120a, a UE 120b, a UE 120c, a UE 120d, and a UE 120e.

The network nodes 110 and the UEs 120 of the wireless communication network 100 may communicate using the electromagnetic spectrum, which may be subdivided by frequency or wavelength into various classes, bands, carriers, and/or channels. For example, devices of the wireless communication network 100 may communicate using one or more operating bands. In some aspects, multiple wireless communication networks 100 may be deployed in a given geographic area. Each wireless communication network 100 may support a particular RAT (which may also be referred to as an air interface) and may operate on one or more carrier frequencies in one or more frequency ranges. Examples of RATs include a 4G RAT, a 5G/NR RAT, and/or a 6G RAT, among other examples. In some examples, when multiple RATs are deployed in a given geographic area, each RAT in the geographic area may operate on different frequencies to avoid interference with one another.

Various operating bands have been defined as frequency range designations FR1 (410 MHz through 7.125 GHz) , FR2 (24.25 GHz through 52.6 GHz) , FR3 (7.125 GHz through 24.25 GHz) , FR4a or FR4-1 (52.6 GHz through 71 GHz) , FR4 (52.6 GHz through 114.25 GHz) , and FR5 (114.25 GHz through 300 GHz) . Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in some documents and articles. Similarly, FR2 is often referred to (interchangeably) as a “millimeter wave” band in some documents and articles, despite being different than the extremely high frequency (EHF) band (30 GHz through 300 GHz) , which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band. The frequencies between FR1 and FR2 are often referred to as mid-band frequencies, which include FR3. Frequency bands falling within FR3 may inherit FR1 characteristics or FR2 characteristics, and thus may effectively extend features of FR1 or FR2 into mid-band frequencies. Thus, “sub-6 GHz, ” if used herein, may broadly refer to frequencies that are less than 6 GHz, that are within FR1, and/or that are included in mid-band frequencies. Similarly, the term “millimeter wave, ” if used herein, may broadly refer to frequencies that are included in mid-band frequencies, that are within FR2, FR4, FR4-a or FR4-1, or FR5, and/or that are within the EHF band. Higher frequency bands may extend 5G NR operation, 6G operation, and/or other RATs beyond 52.6 GHz. For example, each of FR4a, FR4-1, FR4, and FR5 falls within the EHF band. In some examples, the wireless communication network 100 may implement dynamic spectrum sharing (DSS) , in which multiple RATs (for example, 4G/Long Term Evolution (LTE) and 5G/NR) are implemented with dynamic bandwidth allocation (for example, based on user demand) in a single frequency band. It is contemplated that the frequencies included in these operating bands (for example, FR1, FR2, FR3, FR4, FR4-a, FR4-1, and/or FR5) may be modified, and techniques described herein may be applicable to those modified frequency ranges.

A network node 110 may include one or more devices, components, or systems that enable communication between a UE 120 and one or more devices, components, or systems of the wireless communication network 100. A network node 110 may be, may include, or may also be referred to as an NR network node, a 5G network node, a 6G network node, a Node B, an eNB, a gNB, an access point (AP) , a transmission reception point (TRP) , a mobility element, a core, a network entity, a network element, a network equipment, and/or another type of device, component, or system included in a radio access network (RAN) .

A network node 110 may be implemented as a single physical node (for example, a single physical structure) or may be implemented as two or more physical nodes (for example, two or more distinct physical structures) . For example, a network node 110 may be a device or system that implements part of a radio protocol stack, a device or system that implements a full radio protocol stack (such as a full gNB protocol stack) , or a collection of devices or systems that collectively implement the full radio protocol stack. For example, and as shown, a network node 110 may be an aggregated network node (having an aggregated architecture) , meaning that the network node 110 may implement a full radio protocol stack that is physically and logically integrated within a single node (for example, a single physical structure) in the wireless communication network 100. For example, an aggregated network node 110 may consist of a single standalone base station or a single TRP that uses a full radio protocol stack to enable or facilitate communication between a UE 120 and a core network of the wireless communication network 100.

Alternatively, and as also shown, a network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station) , meaning that the network node 110 may implement a radio protocol stack that is physically distributed and/or logically distributed among two or more nodes in the same geographic location or in different geographic locations. For example, a disaggregated network node may have a disaggregated architecture. In some deployments, disaggregated network nodes 110 may be used in an integrated access and backhaul (IAB) network, in an open radio access network (O-RAN) (such as a network configuration in compliance with the O-RAN Alliance) , or in a virtualized radio access network (vRAN) , also known as a cloud radio access network (C-RAN) , to facilitate scaling by separating base station functionality into multiple units that can be individually deployed.

The network nodes 110 of the wireless communication network 100 may include one or more central units (CUs) , one or more distributed units (DUs) , and/or one or more radio units (RUs) . A CU may host one or more higher layer control functions, such as radio resource control (RRC) functions, packet data convergence protocol (PDCP) functions, and/or service data adaptation protocol (SDAP) functions, among other examples. A DU may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and/or one or more higher physical (PHY) layers depending, at least in part, on a functional split, such as a functional split defined by the 3GPP. In some examples, a DU also may host one or more lower PHY layer functions, such as a fast Fourier transform (FFT) , an inverse FFT (iFFT) , beamforming, physical random access channel (PRACH) extraction and filtering, and/or scheduling of resources for one or more UEs 120, among other examples. An RU may host RF processing functions or lower PHY layer functions, such as an FFT, an iFFT, beamforming, or PRACH extraction and filtering, among other examples, according to a functional split, such as a lower layer functional split. In such an architecture, each RU can be operated to handle over the air (OTA) communication with one or more UEs 120.

In some aspects, a single network node 110 may include a combination of one or more CUs, one or more DUs, and/or one or more RUs. Additionally or alternatively, a network node 110 may include one or more Near-Real Time (Near-RT) RAN Intelligent Controllers (RICs) and/or one or more Non-Real Time (Non-RT) RICs. In some examples, a CU, a DU, and/or an RU may be implemented as a virtual unit, such as a virtual central unit (VCU) , a virtual distributed unit (VDU) , or a virtual radio unit (VRU) , among other examples. A virtual unit may be implemented as a virtual network function, such as associated with a cloud deployment.

Some network nodes 110 (for example, a base station, an RU, or a TRP) may provide communication coverage for a particular geographic area. In the 3GPP, the term “cell” can refer to a coverage area of a network node 110 or to a network node 110 itself, depending on the context in which the term is used. A network node 110 may support one or multiple (for example, three) cells. In some examples, a network node 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, or another type of cell. A macro cell may cover a relatively large geographic area (for example, several kilometers in radius) and may allow unrestricted access by UEs 120 with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscriptions. A femto cell may cover a relatively small geographic area (for example, a home) and may allow restricted access by UEs 120 having association with the femto cell (for example, UEs 120 in a closed subscriber group (CSG) ) . A network node 110 for a macro cell may be referred to as a macro network node. A network node 110 for a pico cell may be referred to as a pico network node. A network node 110 for a femto cell may be referred to as a femto network node or an in-home network node. In some examples, a cell may not necessarily be stationary. For example, the geographic area of the cell may move according to the location of an associated mobile network node 110 (for example, a train, a satellite base station, an unmanned aerial vehicle, or an NTN network node) .

The wireless communication network 100 may be a heterogeneous network that includes network nodes 110 of different types, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, aggregated network nodes, and/or disaggregated network nodes, among other examples. In the example shown in Fig. 1, the network node 110a may be a macro network node for a macro cell 130a, the network node 110b may be a pico network node for a pico cell 130b, and the network node 110c may be a femto network node for a femto cell 130c. Various different types of network nodes 110 may generally transmit at different power levels, serve different coverage areas, and/or have different impacts on interference in the wireless communication network 100 than other types of network nodes 110. For example, macro network nodes may have a high transmit power level (for example, 5 to 40 watts) , whereas pico network nodes, femto network nodes, and relay network nodes may have lower transmit power levels (for example, 0.1 to 2 watts) .

In some examples, a network node 110 may be, may include, or may operate as an RU, a TRP, or a base station that communicates with one or more UEs 120 via a radio access link (which may be referred to as a “Uu” link) . The radio access link may include a downlink and an uplink. “Downlink” (or “DL” ) refers to a communication direction from a network node 110 to a UE 120, and “uplink” (or “UL” ) refers to a communication direction from a UE 120 to a network node 110. Downlink channels may include one or more control channels and one or more data channels. A downlink control channel may be used to transmit downlink control information (DCI) (for example, scheduling information, reference signals, and/or configuration information) from a network node 110 to a UE 120. A downlink data channel may be used to transmit downlink data (for example, user data associated with a UE 120) from a network node 110 to a UE 120. Downlink control channels may include one or more physical downlink control channels (PDCCHs) , and downlink data channels may include one or more physical downlink shared channels (PDSCHs) . Uplink channels may similarly include one or more control channels and one or more data channels. An uplink control channel may be used to transmit uplink control information (UCI) (for example, reference signals and/or feedback corresponding to one or more downlink transmissions) from a UE 120 to a network node 110. An uplink data channel may be used to transmit uplink data (for example, user data associated with a UE 120) from a UE 120 to a network node 110. Uplink control channels may include one or more physical uplink control channels (PUCCHs) , and uplink data channels may include one or more physical uplink shared channels (PUSCHs) . The downlink and the uplink may each include a set of resources on which the network node 110 and the UE 120 may communicate.

Downlink and uplink resources may include time domain resources (frames, subframes, slots, and/or symbols) , frequency domain resources (frequency bands, component carriers, subcarriers, resource blocks, and/or resource elements) , and/or spatial domain resources (particular transmit directions and/or beam parameters) . Frequency domain resources of some bands may be subdivided into bandwidth parts (BWPs) . A BWP may be a continuous block of frequency domain resources (for example, a continuous block of resource blocks) that are allocated for one or more UEs 120. A UE 120 may be configured with both an uplink BWP and a downlink BWP (where the uplink BWP and the downlink BWP may be the same BWP or different BWPs) . A BWP may be dynamically configured (for example, by a network node 110 transmitting a DCI configuration to the one or more UEs 120) and/or reconfigured, which means that a BWP can be adjusted in real-time (or near-real-time) based on changing network conditions in the wireless communication network 100 and/or based on the specific requirements of the one or more UEs 120. This enables more efficient use of the available frequency domain resources in the wireless communication network 100 because fewer frequency domain resources may be allocated to a BWP for a UE 120 (which may reduce the quantity of frequency domain resources that a UE 120 is required to monitor) , leaving more frequency domain resources to be spread across multiple UEs 120. Thus, BWPs may also assist in the implementation of lower-capability UEs 120 by facilitating the configuration of smaller bandwidths for communication by such UEs 120.

As described above, in some aspects, the wireless communication network 100 may be, may include, or may be included in, an IAB network. In an IAB network, at least one network node 110 is an anchor network node that communicates with a core network. An anchor network node 110 may also be referred to as an IAB donor (or “IAB-donor” ) . The anchor network node 110 may connect to the core network via a wired backhaul link. For example, an Ng interface of the anchor network node 110 may terminate at the core network. Additionally or alternatively, an anchor network node 110 may connect to one or more devices of the core network that provide a core access and mobility management function (AMF) . An IAB network also generally includes multiple non-anchor network nodes 110, which may also be referred to as relay network nodes or simply as IAB nodes (or “IAB-nodes” ) . Each non-anchor network node 110 may communicate directly with the anchor network node 110 via a wireless backhaul link to access the core network, or may communicate indirectly with the anchor network node 110 via one or more other non-anchor network nodes 110 and associated wireless backhaul links that form a backhaul path to the core network. Some anchor network node 110 or other non-anchor network node 110 may also communicate directly with one or more UEs 120 via wireless access links that carry access traffic. In some examples, network resources for wireless communication (such as time resources, frequency resources, and/or spatial resources) may be shared between access links and backhaul links.

In some examples, any network node 110 that relays communications may be referred to as a relay network node, a relay station, or simply as a relay. A relay may receive a transmission of a communication from an upstream station (for example, another network node 110 or a UE 120) and transmit the communication to a downstream station (for example, a UE 120 or another network node 110) . In this case, the wireless communication network 100 may include or be referred to as a “multi-hop network. ” In the example shown in Fig. 1, the network node 110d (for example, a relay network node) may communicate with the network node 110a (for example, a macro network node) and the UE 120d in order to facilitate communication between the network node 110a and the UE 120d. Additionally or alternatively, a UE 120 may be or may operate as a relay station that can relay transmissions to or from other UEs 120. A UE 120 that relays communications may be referred to as a UE relay or a relay UE, among other examples.

The UEs 120 may be physically dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile. A UE 120 may be, may include, or may be included in an access terminal, another terminal, a mobile station, or a subscriber unit. A UE 120 may be, include, or be coupled with a cellular phone (for example, a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (for example, a smart watch, smart clothing, smart glasses, a smart wristband, and/or smart jewelry, such as a smart ring or a smart bracelet) , an entertainment device (for example, a music device, a video device, and/or a satellite radio) , an XR device, a vehicular component or sensor, a smart meter or sensor, industrial manufacturing equipment, a Global Navigation Satellite System (GNSS) device (such as a Global Positioning System device or another type of positioning device) , a UE function of a network node, and/or any other suitable device or function that may communicate via a wireless medium.

A UE 120 and/or a network node 110 may include one or more chips, system-on-chips (SoCs) , chipsets, packages, or devices that individually or collectively constitute or comprise a processing system. The processing system includes processor (or “processing” ) circuitry in the form of one or multiple processors, microprocessors, processing units (such as central processing units (CPUs) , graphics processing units (GPUs) , neural processing units (NPUs) and/or digital signal processors (DSPs) ) , processing blocks, application-specific integrated circuits (ASIC) , programmable logic devices (PLDs) (such as field programmable gate arrays (FPGAs) ) , or other discrete gate or transistor logic or circuitry (all of which may be generally referred to herein individually as “processors” or collectively as “the processor” or “the processor circuitry” ) . One or more of the processors may be individually or collectively configurable or configured to perform various functions or operations described herein. A group of processors collectively configurable or configured to perform a set of functions may include a first processor configurable or configured to perform a first function of the set and a second processor configurable or configured to perform a second function of the set, or may include the group of processors all being configured or configurable to perform the set of functions.

The processing system may further include memory circuitry in the form of one or more memory devices, memory blocks, memory elements or other discrete gate or transistor logic or circuitry, each of which may include tangible storage media such as random-access memory (RAM) or read-only memory (ROM) , or combinations thereof (all of which may be generally referred to herein individually as “memories” or collectively as “the memory” or “the memory circuitry” ) . One or more of the memories may be coupled (for example, operatively coupled, communicatively coupled, electronically coupled, or electrically coupled) with one or more of the processors and may individually or collectively store processor-executable code (such as software) that, when executed by one or more of the processors, may configure one or more of the processors to perform various functions or operations described herein. Additionally or alternatively, in some examples, one or more of the processors may be preconfigured to perform various functions or operations described herein without requiring configuration by software. The processing system may further include or be coupled with one or more modems (such as a Wi-Fi (for example, Institute of Electrical and Electronics Engineers (IEEE) compliant) modem or a cellular (for example, 3GPP 4G LTE, 5G, or 6G compliant) modem) . In some implementations, one or more processors of the processing system include or implement one or more of the modems. The processing system may further include or be coupled with multiple radios (collectively “the radio” ) , multiple RF chains, or multiple transceivers, each of which may in turn be coupled with one or more of multiple antennas. In some implementations, one or more processors of the processing system include or implement one or more of the radios, RF chains or transceivers. The UE 120 may include or may be included in a housing that houses components associated with the UE 120 including the processing system.

Some UEs 120 may be considered machine-type communication (MTC) UEs, evolved or enhanced machine-type communication (eMTC) , UEs, further enhanced eMTC (feMTC) UEs, or enhanced feMTC (efeMTC) UEs, or further evolutions thereof, all of which may be simply referred to as “MTC UEs” . An MTC UE may be, may include, or may be included in or coupled with a robot, an uncrewed aerial vehicle, a remote device, a sensor, a meter, a monitor, and/or a location tag. Some UEs 120 may be considered IoT devices and/or may be implemented as NB-IoT (narrowband IoT) devices. An IoT UE or NB-IoT device may be, may include, or may be included in or coupled with an industrial machine, an appliance, a refrigerator, a doorbell camera device, a home automation device, and/or a light fixture, among other examples. Some UEs 120 may be considered Customer Premises Equipment, which may include telecommunications devices that are installed at a customer location (such as a home or office) to enable access to a service provider's network (such as included in or in communication with the wireless communication network 100) .

Some UEs 120 may be classified according to different categories in association with different complexities and/or different capabilities. UEs 120 in a first category may facilitate massive IoT in the wireless communication network 100, and may offer low complexity and/or cost relative to UEs 120 in a second category. UEs 120 in a second category may include mission-critical IoT devices, legacy UEs, baseline UEs, high-tier UEs, advanced UEs, full-capability UEs, and/or premium UEs that are capable of URLLC, eMBB, and/or precise positioning in the wireless communication network 100, among other examples. A third category of UEs 120 may have mid-tier complexity and/or capability (for example, a capability between UEs 120 of the first category and UEs 120 of the second capability) . A UE 120 of the third category may be referred to as a reduced capacity UE ( “RedCap UE” ) , a mid-tier UE, an NR-Light UE, and/or an NR-Lite UE, among other examples. RedCap UEs may bridge a gap between the capability and complexity of NB-IoT devices and/or eMTC UEs, and mission-critical IoT devices and/or premium UEs. RedCap UEs may include, for example, wearable devices, IoT devices, industrial sensors, and/or cameras that are associated with a limited bandwidth, power capacity, and/or transmission range, among other examples. RedCap UEs may support healthcare environments, building automation, electrical distribution, process automation, transport and logistics, and/or smart city deployments, among other examples.

In some examples, two or more UEs 120 (for example, shown as UE 120a and UE 120e) may communicate directly with one another using sidelink communications (for example, without communicating by way of a network node 110 as an intermediary) . As an example, the UE 120a may directly transmit data, control information, or other signaling as a sidelink communication to the UE 120e. This is in contrast to, for example, the UE 120a first transmitting data in an UL communication to a network node 110, which then transmits the data to the UE 120e in a DL communication. In various examples, the UEs 120 may transmit and receive sidelink communications using peer-to-peer (P2P) communication protocols, device-to-device (D2D) communication protocols, vehicle-to-everything (V2X) communication protocols (which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, and/or vehicle-to-pedestrian (V2P) protocols) , and/or mesh network communication protocols. In some deployments and configurations, a network node 110 may schedule and/or allocate resources for sidelink communications between UEs 120 in the wireless communication network 100. In some other deployments and configurations, a UE 120 (instead of a network node 110) may perform, or collaborate or negotiate with one or more other UEs to perform, scheduling operations, resource selection operations, and/or other operations for sidelink communications.

In various examples, some of the network nodes 110 and the UEs 120 of the wireless communication network 100 may be configured for full-duplex operation in addition to half-duplex operation. A network node 110 or a UE 120 operating in a half-duplex mode may perform only one of transmission or reception during particular time resources, such as during particular slots, symbols, or other time periods. Half-duplex operation may involve TDD, in which DL transmissions of the network node 110 and UL transmissions of the UE 120 do not occur in the same time resources (that is, the transmissions do not overlap in time) . In contrast, a network node 110 or a UE 120 operating in a full-duplex mode can transmit and receive communications concurrently (for example, in the same time resources) . By operating in a full-duplex mode, network nodes 110 and/or UEs 120 may generally increase the capacity of the network and the radio access link. In some examples, full-duplex operation may involve frequency-division duplexing (FDD) , in which DL transmissions of the network node 110 are performed in a first frequency band or on a first component carrier and transmissions of the UE 120 are performed in a second frequency band or on a second component carrier different than the first frequency band or the first component carrier, respectively. In some examples, full-duplex operation may be enabled for a UE 120 but not for a network node 110. For example, a UE 120 may simultaneously transmit an UL transmission to a first network node 110 and receive a DL transmission from a second network node 110 in the same time resources. In some other examples, full-duplex operation may be enabled for a network node 110 but not for a UE 120. For example, a network node 110 may simultaneously transmit a DL transmission to a first UE 120 and receive an UL transmission from a second UE 120 in the same time resources. In some other examples, full-duplex operation may be enabled for both a network node 110 and a UE 120.

In some examples, the UEs 120 and the network nodes 110 may perform MIMO communication. “MIMO” generally refers to transmitting or receiving multiple signals (such as multiple layers or multiple data streams) simultaneously over the same time and frequency resources. MIMO techniques generally exploit multipath propagation. MIMO may be implemented using various spatial processing or spatial multiplexing operations. In some examples, MIMO may support simultaneous transmission to multiple receivers, referred to as multi-user MIMO (MU-MIMO) . Some RATs may employ advanced MIMO techniques, such as mTRP operation (including redundant transmission or reception on multiple TRPs) , reciprocity in the time domain or the frequency domain, single-frequency-network (SFN) transmission, or non-coherent joint transmission (NC-JT) .

In some aspects, a UE (e.g., the UE 120) may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may transmit, to a TRP, an SRS; receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and perform a UE measurement behavior and reporting measurement results based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS. As described in more detail elsewhere herein, the communication manager 140 may transmit, to a TRP, an SRS; receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and transmit, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.

In some aspects, the network node 110 may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may receive, via a TRP associated with the network node, an SRS; transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receive, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a UE measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS. As described in more detail elsewhere herein, the communication manager 150 may receive, via a TRP associated with the network node, an SRS; transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receive, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.

As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.

Fig. 2 is a diagram illustrating an example network node 110 in communication with an example UE 120 in a wireless network, in accordance with the present disclosure.

As shown in Fig. 2, the network node 110 may include a data source 212, a transmit processor 214, a transmit (Tx) MIMO processor 216, a set of modems 232 (shown as 232a through 232t, where t ≥ 1) , a set of antennas 234 (shown as 234a through 234v, where v ≥ 1) , a MIMO detector 236, a receive processor 238, a data sink 239, a controller/processor 240, a memory 242, a communication unit 244, a scheduler 246, and/or a communication manager 150, among other examples. In some configurations, one or a combination of the antenna (s) 234, the modem (s) 232, the MIMO detector 236, the receive processor 238, the transmit processor 214, and/or the Tx MIMO processor 216 may be included in a transceiver of the network node 110. The transceiver may be under control of and used by one or more processors, such as the controller/processor 240, and in some aspects in conjunction with processor-readable code stored in the memory 242, to perform aspects of the methods, processes, and/or operations described herein. In some aspects, the network node 110 may include one or more interfaces, communication components, and/or other components that facilitate communication with the UE 120 or another network node.

The terms “processor, ” “controller, ” or “controller/processor” may refer to one or more controllers and/or one or more processors. For example, reference to “a/the processor, ” “a/the controller/processor, ” or the like (in the singular) should be understood to refer to any one or more of the processors described in connection with Fig. 2, such as a single processor or a combination of multiple different processors. Reference to “one or more processors” should be understood to refer to any one or more of the processors described in connection with Fig. 2. For example, one or more processors of the network node 110 may include transmit processor 214, Tx MIMO processor 216, MIMO detector 236, receive processor 238, and/or controller/processor 240. Similarly, one or more processors of the UE 120 may include MIMO detector 256, receive processor 258, transmit processor 264, Tx MIMO processor 266, and/or controller/processor 280.

In some aspects, a single processor may perform all of the operations described as being performed by the one or more processors. In some aspects, a first set of (one or more) processors of the one or more processors may perform a first operation described as being performed by the one or more processors, and a second set of (one or more) processors of the one or more processors may perform a second operation described as being performed by the one or more processors. The first set of processors and the second set of processors may be the same set of processors or may be different sets of processors. Reference to “one or more memories” should be understood to refer to any one or more memories of a corresponding device, such as the memory described in connection with Fig. 2. For example, operation described as being performed by one or more memories can be performed by the same subset of the one or more memories or different subsets of the one or more memories.

For downlink communication from the network node 110 to the UE 120, the transmit processor 214 may receive data ( “downlink data” ) intended for the UE 120 (or a set of UEs that includes the UE 120) from the data source 212 (such as a data pipeline or a data queue) . In some examples, the transmit processor 214 may select one or more MCSs for the UE 120 in accordance with one or more channel quality indicators (CQIs) received from the UE 120. The network node 110 may process the data (for example, including encoding the data) for transmission to the UE 120 on a downlink in accordance with the MCS (s) selected for the UE 120 to generate data symbols. The transmit processor 214 may process system information (for example, semi-static resource partitioning information (SRPI) ) and/or control information (for example, CQI requests, grants, and/or upper layer signaling) and provide overhead symbols and/or control symbols. The transmit processor 214 may generate reference symbols for reference signals (for example, a cell-specific reference signal (CRS) , a demodulation reference signal (DMRS) , or a channel state information (CSI) reference signal (CSI-RS) ) and/or synchronization signals (for example, a primary synchronization signal (PSS) or a secondary synchronization signals (SSS) ) .

The Tx MIMO processor 216 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide a set of output symbol streams (for example, T output symbol streams) to the set of modems 232. For example, each output symbol stream may be provided to a respective modulator component (shown as MOD) of a modem 232. Each modem 232 may use the respective modulator component to process (for example, to modulate) a respective output symbol stream (for example, for orthogonal frequency division multiplexing (OFDM) ) to obtain an output sample stream. Each modem 232 may further use the respective modulator component to process (for example, convert to analog, amplify, filter, and/or upconvert) the output sample stream to obtain a time domain downlink signal. The modems 232a through 232t may together transmit a set of downlink signals (for example, T downlink signals) via the corresponding set of antennas 234.

A downlink signal may include a DCI communication, a MAC control element (MAC-CE) communication, an RRC communication, a downlink reference signal, or another type of downlink communication. Downlink signals may be transmitted on a PDCCH, a PDSCH, and/or on another downlink channel. A downlink signal may carry one or more transport blocks (TBs) of data. A TB may be a unit of data that is transmitted over an air interface in the wireless communication network 100. A data stream (for example, from the data source 212) may be encoded into multiple TBs for transmission over the air interface. The quantity of TBs used to carry the data associated with a particular data stream may be associated with a TB size common to the multiple TBs. The TB size may be based on or otherwise associated with radio channel conditions of the air interface, the MCS used for encoding the data, the downlink resources allocated for transmitting the data, and/or another parameter. In general, the larger the TB size, the greater the amount of data that can be transmitted in a single transmission, which reduces signaling overhead. However, larger TB sizes may be more prone to transmission and/or reception errors than smaller TB sizes, but such errors may be mitigated by more robust error correction techniques.

For uplink communication from the UE 120 to the network node 110, uplink signals from the UE 120 may be received by an antenna 234, may be processed by a modem 232 (for example, a demodulator component, shown as DEMOD, of a modem 232) , may be detected by the MIMO detector 236 (for example, a receive (Rx) MIMO processor) if applicable, and/or may be further processed by the receive processor 238 to obtain decoded data and/or control information. The receive processor 238 may provide the decoded data to a data sink 239 (which may be a data pipeline, a data queue, and/or another type of data sink) and provide the decoded control information to a processor, such as the controller/processor 240.

The network node 110 may use the scheduler 246 to schedule one or more UEs 120 for downlink or uplink communications. In some aspects, the scheduler 246 may use DCI to dynamically schedule DL transmissions to the UE 120 and/or UL transmissions from the UE 120. In some examples, the scheduler 246 may allocate recurring time domain resources and/or frequency domain resources that the UE 120 may use to transmit and/or receive communications using an RRC configuration (for example, a semi-static configuration) , for example, to perform semi-persistent scheduling (SPS) or to configure a configured grant (CG) for the UE 120.

One or more of the transmit processor 214, the Tx MIMO processor 216, the modem 232, the antenna 234, the MIMO detector 236, the receive processor 238, and/or the controller/processor 240 may be included in an RF chain of the network node 110. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs) , and/or other devices that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for processing by one or more processors of the network node 110) . In some aspects, the RF chain may be or may be included in a transceiver of the network node 110.

In some examples, the network node 110 may use the communication unit 244 to communicate with a core network and/or with other network nodes. The communication unit 244 may support wired and/or wireless communication protocols and/or connections, such as Ethernet, optical fiber, common public radio interface (CPRI) , and/or a wired or wireless backhaul, among other examples. The network node 110 may use the communication unit 244 to transmit and/or receive data associated with the UE 120 or to perform network control signaling, among other examples. The communication unit 244 may include a transceiver and/or an interface, such as a network interface.

The UE 120 may include a set of antennas 252 (shown as antennas 252a through 252r, where r ≥ 1) , a set of modems 254 (shown as modems 254a through 254u, where u ≥ 1) , a MIMO detector 256, a receive processor 258, a data sink 260, a data source 262, a transmit processor 264, a Tx MIMO processor 266, a controller/processor 280, a memory 282, and/or a communication manager 140, among other examples. One or more of the components of the UE 120 may be included in a housing 284. In some aspects, one or a combination of the antenna (s) 252, the modem (s) 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, or the Tx MIMO processor 266 may be included in a transceiver that is included in the UE 120. The transceiver may be under control of and used by one or more processors, such as the controller/processor 280, and in some aspects in conjunction with processor-readable code stored in the memory 282, to perform aspects of the methods, processes, or operations described herein. In some aspects, the UE 120 may include another interface, another communication component, and/or another component that facilitates communication with the network node 110 and/or another UE 120.

For downlink communication from the network node 110 to the UE 120, the set of antennas 252 may receive the downlink communications or signals from the network node 110 and may provide a set of received downlink signals (for example, R received signals) to the set of modems 254. For example, each received signal may be provided to a respective demodulator component (shown as DEMOD) of a modem 254. Each modem 254 may use the respective demodulator component to condition (for example, filter, amplify, downconvert, and/or digitize) a received signal to obtain input samples. Each modem 254 may use the respective demodulator component to further demodulate or process the input samples (for example, for OFDM) to obtain received symbols. The MIMO detector 256 may obtain received symbols from the set of modems 254, may perform MIMO detection on the received symbols if applicable, and may provide detected symbols. The receive processor 258 may process (for example, decode) the detected symbols, may provide decoded data for the UE 120 to the data sink 260 (which may include a data pipeline, a data queue, and/or an application executed on the UE 120) , and may provide decoded control information and system information to the controller/processor 280.

For uplink communication from the UE 120 to the network node 110, the transmit processor 264 may receive and process data ( “uplink data” ) from a data source 262 (such as a data pipeline, a data queue, and/or an application executed on the UE 120) and control information from the controller/processor 280. The control information may include one or more parameters, feedback, one or more signal measurements, and/or other types of control information. In some aspects, the receive processor 258 and/or the controller/processor 280 may determine, for a received signal (such as received from the network node 110 or another UE) , one or more parameters relating to transmission of the uplink communication. The one or more parameters may include a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, a CQI parameter, or a transmit power control (TPC) parameter, among other examples. The control information may include an indication of the RSRP parameter, the RSSI parameter, the RSRQ parameter, the CQI parameter, the TPC parameter, and/or another parameter. The control information may facilitate parameter selection and/or scheduling for the UE 120 by the network node 110.

The transmit processor 264 may generate reference symbols for one or more reference signals, such as an uplink DMRS, an uplink sounding reference signal (SRS) , and/or another type of reference signal. The symbols from the transmit processor 264 may be precoded by the Tx MIMO processor 266, if applicable, and further processed by the set of modems 254 (for example, for DFT-s-OFDM or CP-OFDM) . The Tx MIMO processor 266 may perform spatial processing (for example, precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide a set of output symbol streams (for example, U output symbol streams) to the set of modems 254. For example, each output symbol stream may be provided to a respective modulator component (shown as MOD) of a modem 254. Each modem 254 may use the respective modulator component to process (for example, to modulate) a respective output symbol stream (for example, for OFDM) to obtain an output sample stream. Each modem 254 may further use the respective modulator component to process (for example, convert to analog, amplify, filter, and/or upconvert) the output sample stream to obtain an uplink signal.

The modems 254a through 254u may transmit a set of uplink signals (for example, R uplink signals or U uplink symbols) via the corresponding set of antennas 252. An uplink signal may include a UCI communication, a MAC-CE communication, an RRC communication, or another type of uplink communication. Uplink signals may be transmitted on a PUSCH, a PUCCH, and/or another type of uplink channel. An uplink signal may carry one or more TBs of data. Sidelink data and control transmissions (that is, transmissions directly between two or more UEs 120) may generally use similar techniques as were described for uplink data and control transmission, and may use sidelink-specific channels such as a physical sidelink shared channel (PSSCH) , a physical sidelink control channel (PSCCH) , and/or a physical sidelink feedback channel (PSFCH) .

One or more antennas of the set of antennas 252 or the set of antennas 234 may include, or may be included within, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays, among other examples. An antenna panel, an antenna group, a set of antenna elements, or an antenna array may include one or more antenna elements (within a single housing or multiple housings) , a set of coplanar antenna elements, a set of non-coplanar antenna elements, or one or more antenna elements coupled with one or more transmission or reception components, such as one or more components of Fig. 2. As used herein, “antenna” can refer to one or more antennas, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays. “Antenna panel” can refer to a group of antennas (such as antenna elements) arranged in an array or panel, which may facilitate beamforming by manipulating parameters of the group of antennas. “Antenna module” may refer to circuitry including one or more antennas, which may also include one or more other components (such as filters, amplifiers, or processors) associated with integrating the antenna module into a wireless communication device.

In some examples, each of the antenna elements of an antenna 234 or an antenna 252 may include one or more sub-elements for radiating or receiving radio frequency signals. For example, a single antenna element may include a first sub-element cross-polarized with a second sub-element that can be used to independently transmit cross-polarized signals. The antenna elements may include patch antennas, dipole antennas, and/or other types of antennas arranged in a linear pattern, a two-dimensional pattern, or another pattern. A spacing between antenna elements may be such that signals with a desired wavelength transmitted separately by the antenna elements may interact or interfere constructively and destructively along various directions (such as to form a desired beam) . For example, given an expected range of wavelengths or frequencies, the spacing may provide a quarter wavelength, a half wavelength, or another fraction of a wavelength of spacing between neighboring antenna elements to allow for the desired constructive and destructive interference patterns of signals transmitted by the separate antenna elements within that expected range.

The amplitudes and/or phases of signals transmitted via antenna elements and/or sub-elements may be modulated and shifted relative to each other (such as by manipulating phase shift, phase offset, and/or amplitude) to generate one or more beams, which is referred to as beamforming. The term “beam” may refer to a directional transmission of a wireless signal toward a receiving device or otherwise in a desired direction. “Beam” may also generally refer to a direction associated with such a directional signal transmission, a set of directional resources associated with the signal transmission (for example, an angle of arrival, a horizontal direction, and/or a vertical direction) , and/or a set of parameters that indicate one or more aspects of a directional signal, a direction associated with the signal, and/or a set of directional resources associated with the signal. In some implementations, antenna elements may be individually selected or deselected for directional transmission of a signal (or signals) by controlling amplitudes of one or more corresponding amplifiers and/or phases of the signal (s) to form one or more beams. The shape of a beam (such as the amplitude, width, and/or presence of side lobes) and/or the direction of a beam (such as an angle of the beam relative to a surface of an antenna array) can be dynamically controlled by modifying the phase shifts, phase offsets, and/or amplitudes of the multiple signals relative to each other.

Different UEs 120 or network nodes 110 may include different numbers of antenna elements. For example, a UE 120 may include a single antenna element, two antenna elements, four antenna elements, eight antenna elements, or a different number of antenna elements. As another example, a network node 110 may include eight antenna elements, 24 antenna elements, 64 antenna elements, 128 antenna elements, or a different number of antenna elements. Generally, a larger number of antenna elements may provide increased control over parameters for beam generation relative to a smaller number of antenna elements, whereas a smaller number of antenna elements may be less complex to implement and may use less power than a larger number of antenna elements. Multiple antenna elements may support multiple-layer transmission, in which a first layer of a communication (which may include a first data stream) and a second layer of a communication (which may include a second data stream) are transmitted using the same time and frequency resources with spatial multiplexing.

While blocks in Fig. 2 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and/or the Tx MIMO processor 266 may be performed by or under the control of the controller/processor 280.

As indicated above, Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.

Fig. 3 is a diagram illustrating an example disaggregated base station architecture 300, in accordance with the present disclosure. One or more components of the example disaggregated base station architecture 300 may be, may include, or may be included in one or more network nodes (such one or more network nodes 110) . The disaggregated base station architecture 300 may include a CU 310 that can communicate directly with a core network 320 via a backhaul link, or that can communicate indirectly with the core network 320 via one or more disaggregated control units, such as a Non-RT RIC 350 associated with a Service Management and Orchestration (SMO) Framework 360 and/or a Near-RT RIC 370 (for example, via an E2 link) . The CU 310 may communicate with one or more DUs 330 via respective midhaul links, such as via F1 interfaces. Each of the DUs 330 may communicate with one or more RUs 340 via respective fronthaul links. Each of the RUs 340 may communicate with one or more UEs 120 via respective RF access links. In some deployments, a UE 120 may be simultaneously served by multiple RUs 340.

Each of the components of the disaggregated base station architecture 300, including the CUs 310, the DUs 330, the RUs 340, the Near-RT RICs 370, the Non-RT RICs 350, and the SMO Framework 360, may include one or more interfaces or may be coupled with one or more interfaces for receiving or transmitting signals, such as data or information, via a wired or wireless transmission medium.

In some aspects, the CU 310 may be logically split into one or more CU user plane (CU-UP) units and one or more CU control plane (CU-CP) units. A CU-UP unit may communicate bidirectionally with a CU-CP unit via an interface, such as the E1 interface when implemented in an O-RAN configuration. The CU 310 may be deployed to communicate with one or more DUs 330, as necessary, for network control and signaling. Each DU 330 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 340. For example, a DU 330 may host various layers, such as an RLC layer, a MAC layer, or one or more PHY layers, such as one or more high PHY layers or one or more low PHY layers. Each layer (which also may be referred to as a module) may be implemented with an interface for communicating signals with other layers (and modules) hosted by the DU 330, or for communicating signals with the control functions hosted by the CU 310. Each RU 340 may implement lower layer functionality. In some aspects, real-time and non-real-time aspects of control and user plane communication with the RU (s) 340 may be controlled by the corresponding DU 330.

The SMO Framework 360 may support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 360 may support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operations and maintenance interface, such as an O1 interface. For virtualized network elements, the SMO Framework 360 may interact with a cloud computing platform (such as an open cloud (O-Cloud) platform 390) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface, such as an O2 interface. A virtualized network element may include, but is not limited to, a CU 310, a DU 330, an RU 340, a non-RT RIC 350, and/or a Near-RT RIC 370. In some aspects, the SMO Framework 360 may communicate with a hardware aspect of a 4G RAN, a 5G NR RAN, and/or a 6G RAN, such as an open eNB (O-eNB) 380, via an O1 interface. Additionally or alternatively, the SMO Framework 360 may communicate directly with each of one or more RUs 340 via a respective O1 interface. In some deployments, this configuration can enable each DU 330 and the CU 310 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

The Non-RT RIC 350 may include or may implement a logical function that enables non-real-time control and optimization of RAN elements and resources, AI/ML workflows including model training and updates, and/or policy-based guidance of applications and/or features in the Near-RT RIC 370. The Non-RT RIC 350 may be coupled to or may communicate with (such as via an A1 interface) the Near-RT RIC 370. The Near-RT RIC 370 may include or may implement a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions via an interface (such as via an E2 interface) connecting one or more CUs 310, one or more DUs 330, and/or an O-eNB with the Near-RT RIC 370.

In some aspects, to generate AI/ML models to be deployed in the Near-RT RIC 370, the Non-RT RIC 350 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 370 and may be received at the SMO Framework 360 or the Non-RT RIC 350 from non-network data sources or from network functions. In some examples, the Non-RT RIC 350 or the Near-RT RIC 370 may tune RAN behavior or performance. For example, the Non-RT RIC 350 may monitor long-term trends and patterns for performance and may employ AI/ML models to perform corrective actions via the SMO Framework 360 (such as reconfiguration via an O1 interface) or via creation of RAN management policies (such as A1 interface policies) .

The network node 110, the controller/processor 240 of the network node 110, the UE 120, the controller/processor 280 of the UE 120, the CU 310, the DU 330, the RU 340, or any other component (s) of Figs. 1, 2, or 3 may implement one or more techniques or perform one or more operations associated with UE measurement behavior and reporting depending on whether a received CSI-RS is precoded, as described in more detail elsewhere herein. For example, the controller/processor 240 of the network node 110, the controller/processor 280 of the UE 120, any other component (s) of Fig. 2, the CU 310, the DU 330, or the RU 340 may perform or direct operations of, for example, process 900 of Fig. 9, process 1000 of Fig. 10, process 1100 of Fig. 11, process 1200 of Fig. 12, or other processes as described herein (alone or in conjunction with one or more other processors) . The memory 242 may store data and program codes for the network node 110, the network node 110, the CU 310, the DU 330, or the RU 340. The memory 282 may store data and program codes for the UE 120. In some examples, the memory 242 or the memory 282 may include a non-transitory computer-readable medium storing a set of instructions (for example, code or program code) for wireless communication. The memory 242 may include one or more memories, such as a single memory or multiple different memories (of the same type or of different types) . The memory 282 may include one or more memories, such as a single memory or multiple different memories (of the same type or of different types) . For example, the set of instructions, when executed (for example, directly, or after compiling, converting, or interpreting) by one or more processors of the network node 110, the UE 120, the CU 310, the DU 330, or the RU 340, may cause the one or more processors to perform process 900 of Fig. 9, process 1000 of Fig. 10, process 1100 of Fig. 11, process 1200 of Fig. 12, or other processes as described herein. In some examples, executing instructions may include running the instructions, converting the instructions, compiling the instructions, and/or interpreting the instructions, among other examples.

In some aspects, a UE (e.g., the UE 120) includes means for transmitting, to a TRP, an SRS; means for receiving, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and/or means for performing a UE measurement behavior and reporting measurement results based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS. In some aspects, the UE includes means for transmitting, to a TRP, an SRS; means for receiving, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and/or means for transmitting, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs. The means for the UE to perform operations described herein may include, for example, one or more of communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller/processor 280, or memory 282.

In some aspects, a network node (e.g., the network node 110) includes means for receiving, via a TRP associated with the network node, an SRS; means for transmitting, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and/or means for receiving, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a UE measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS. In some aspects, the network node includes means for receiving, via a TRP associated with the network node, an SRS; means for transmitting, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and/or means for receiving, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs. The means for the network node to perform operations described herein may include, for example, one or more of communication manager 150, transmit processor 214, TX MIMO processor 216, modem 232, antenna 234, MIMO detector 236, receive processor 238, controller/processor 240, memory 242, or scheduler 246.

As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.

For MIMO on a UE-assisted coherent joint transmission (CJT) multiple TRP (mTRP) , a UE reporting enhancement may be specified for CJT deployments under non-ideal synchronization and backhaul. The UE reporting enhancement may target a first frequency range (FR1) , and both frequency division duplexing (FDD) and time division duplexing (TDD) . The UE reporting enhancement may define an inter-TRP time misalignment and frequency/phase offset measurement and reporting, assuming a legacy CSI-RS design and with a standalone aperiodic reporting on a PUSCH.

A TDD reciprocity issue (or channel reciprocity issue) may occur for CJT TDD. With a TRP-specific Rx-Tx phase/timing misalignment, a mismatch may occur between an uplink channel measured via an SRS (H^UL) and a downlink channel potentially for a PDSCH (H^DL) , such that H^DL≠ (H^UL) ^T.

In a TDD system, an SRS sounding for a downlink channel measurement may be based at least in part on a reciprocity, in accordance with H^DL= (H^UL) ^T. For CJT mTRP,

However, for distributed TRPs with each having an individual clock source, a measured uplink channel via SRS (including Tx and Rx phase) may be:

A downlink channel (including Tx and Rx phase) for a potential PDSCH may be in accordance with:

An Rx misalignment ψ^Rx and a Tx misalignment ψ^Tx (for either TRPs or a UE) may include a timing offset (denoted as τ^Rx, τ^Tx) and a phase offset (denoted as φ^Rx, φ^Tx) , where:
ψ^Rx (k) =exp (j2πkΔfτ^Rx+jφ^Rx) at subcarrier k, and
ψ^Tx (k) =exp (-j2πkΔτ^Tx-jφ^Tx) at subcarrier k.

A reciprocity-based SRS channel sounding may be enabled based at least in part on:

where θ is a TRP-common constant (which may be unknown) .

The following may be derived:

To enable SRS reciprocity for a CJT-TDD system, an inter-TRP Rx-Tx timing offset (τ_TRP2to1) and a phase offset (φ_TRP2to1) should be eliminated in accordance with:

where the timing offset τ_TRP2to1 does not include a channel propagation delay, and the phase offset φ_TRP2to1 does not include a channel phase.

For an aperiodic standalone CJT calibration reporting, various use cases may be assumed. For a per-TRP downlink/uplink Rx-Tx phase misalignment reporting, a first use case may involve TRP selection, and a second use case may involve a per-TRP downlink/uplink Rx-Tx phase compensation at a network side for reciprocity (e.g., using both CSI-RS and SRS for measurement) . Further, a third use case may involve, for TDD reciprocity, a timing offset report for at least one pair of TRPs to assist TRP synchronization (e.g., to align a TRP inherent timing without a propagation delay) .

Fig. 4 is a diagram illustrating an example of a precoded CSI-RS in which a channel is canceled, in accordance with the present disclosure. As shown in Fig. 4, example 400 includes a single UE antenna/transceiver, a first TRP (TRP1) , and a second TRP (TRP2) .

In a first scheme, a CSI-RS may be precoded with a conjugate of an estimated uplink channeland a channel impact may be canceled when UE receives a CSI-RS and estimates a downlink channel. As shown by reference number 402, the UE may transmit an SRS to the first TRP and the second TRP. A received SRS may be denoted asFor an Rx side (either TRP or UE) , ψ^Rx (k) =exp (j2πkτ^RxΔf+jφ^Rx) at subcarrier k. For a Tx side (either TRP or UE) , ψ^Tx (k) =exp (-j2πkτ^RxΔf-jφ^Tx) at subcarrier k. Each SRS port may be transmitted with the UE’s single antenna/transceiver when phase coherence is not guaranteed between the UE’s transceivers. As shown by reference number 404, each TRP may transmit a corresponding downlink reference signal (such as a single- port CSI-RS) , to the UE, where each CSI-RS may be precoded based at least in part on a phase of a corresponding received SRS (e.g., phase conjugatesand) . The UE may receive a precoded CSI-RS y₁ from the first TRP and a precoded CSI-RS y₂ from the second TRP. A CSI-RS precoding may ensure that a channel propagation delay and a channel phase are canceled out, and thus there is no impact to y₁, y₂, where:

As shown by reference number 406, the UE may determine:

which may ensure that a phase of the UE’s Rx-Tx uncertainty is canceled out, and the only remaining phase is an inter-TRP timing offset and phase offset, which is in accordance with:

The inter-TRP timing offset and phase offset between the two TRPs (τ_TRP2to1,φ_TRP2to1) may be estimated byy₂ (k) across subcarriers k=1, …, K over the entire bandwidth, and the inter-TRP timing offset and the phase offset may be measurements that are obtained by the UE. The UE may determiney₂ on multiple subcarriers, and the UE may derive the inter-TRP timing offset (τ_TRP2to1) (or time alignment error (TAE) ) and the phase offset φ_TRP2to1) . The UE may derive the inter-TRP timing offset and the phase offset based at least in part on a UE measurement behavior, which may depend on the CSI-RS being precoded. As shown by reference number 408, the UE may report the estimated τ_TRP2to1, φ_TRP2to1 to one of the TRPs to synchronize to the other TRP. For example, the UE may report the estimated τ_TRP2to1, φ_TRP2to1 to the second TRP. The UE may report the estimated τ_TRP2to1, φ_TRP2to1 based at least in part on a reporting of measurement results. In some examples, the UE may report the estimated τ_TRP2to1, φ_TRP2to1 to the second TRP using a different approach, such that multiple approaches may be possible for reporting the estimated τ_TRP2to1, φ_TRP2to1 to the second TRP. As shown by reference number 410, the second TRP may synchronize with the first TRP. The second TRP may synchronize with the first TRP based at least in part on the estimated τ_TRP2to1, φ_TRP2to1 received from the UE. In some examples, the second TRP may synchronize with the first TRP using a different approach, such that multiple approaches may be possible for synchronization between the first TRP and the second TRP.

As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.

Fig. 5 is a diagram illustrating an example of a precoded CSI-RS in which a channel is canceled and with respect to multiple UE antennas or transceivers, in accordance with the present disclosure. As shown in Fig. 5, example 500 includes a UE associated with a plurality of UE antennas/transceivers (e.g., UE transceiver 1, …, UE transceiver A) , a first TRP (TRP1) , and a second TRP (TRP2) .

A multiple antenna UE-assisted TRP synchronization may be used for TDD. As shown by reference number 502, the UE may transmit A>1 SRSs (or A>1 ports) to the first TRP and the second TRP using its A>1 transceivers/antennas, respectively. A received SRS may be denoted as z_{TRP1←UE [1]} , …, z_{TRP1←UE [A]} at the first TRP and z_{TRP2←UE [1]} , …, z_{TRP2←UE [A]} at the second TRP, where the A>1 received CSI-RSs at the UE are denoted as (TRP1 as an example, and similar for TRP2) :

As shown by reference number 504, each TRP may transmit A>1 corresponding single-port CSI-RSs to the UE, where each CSI-RS may be precoded based at least in part on a corresponding received SRS (port) . The CSI-RSs may be precoded by at the first TRP, and the CSI-RSs may be precoded by at the second TRP. As shown by reference number 506, the UE may determine {y_TPR1} ^* {y_TPR2} on multiple subcarriers based at least in part on received signals from each TRP, and the UE may derive an inter-TRP timing offset (τ_TRP2to1) and a phase offset (φ_TRP2to1) . The inter-TRP timing offset and the phase offset may be measurements which are obtained by the UE. The UE may derive the inter-TRP timing offset and the phase offset based at least in part on a UE measurement behavior, which may depend on the CSI-RS being precoded. The inter-TRP timing offset and the phase offset may be measurements that are obtained by the UE. As shown by reference number 508, the UE may report an estimated τ_TRP2to1, φ_TRP2to1 to the second TRP. The UE may report the estimated τ_TRP2to1, φ_TRP2to1 based at least in part on a reporting of measurement results. In some examples, the UE may report the estimated τ_TRP2to1, φ_TRP2to1 to the second TRP using a different approach, such that multiple approaches may be possible for reporting the estimated τ_TRP2to1, φ_TRP2to1 to the second TRP. As shown by reference number 510, the second TRP may synchronize to the first TRP. The second TRP may synchronize with the first TRP based at least in part on the estimated τ_TRP2to1, φ_TRP2to1 received from the UE. In some examples, the second TRP may synchronize with the first TRP using a different approach, such that multiple approaches may be possible for synchronization between the first TRP and the second TRP.

As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with regard to Fig. 5.

Fig. 6 is a diagram illustrating an example of a normal CSI-RS in which a channel is not canceled, in accordance with the present disclosure. As shown in Fig. 6, example 600 includes a single UE antenna/transceiver, a first TRP (TRP1) , and a second TRP (TRP2) .

In a second scheme, a normal CSI-RS may be employed and a channel may not be canceled. “Normal” CSI-RS may refer to a CSI-RS that is not precoded with but such an approach may not be workable with multiple non-coherent UE antennas or transceivers. As shown by reference number 602, the UE may transmit an SRS to a first TRP and a second TRP. A received SRS may be denoted as For an Rx side (either TRP or UE) , ψ^Rx (k) =exp (j2πkτ^RxΔf+jφ^Rx) at subcarrier k. For a Tx side (either TRP or UE) , ψ^Tx (k) =exp (-j2πkτ^RxΔf-jψ^Tx) at subcarrier k. Each SRS port may be transmitted with the UE’s single antenna/transceiver when phase coherence is not guaranteed between the UE’s transceivers. The SRS received by the first TRP is denoted as z₁, and the SRS received by the second SRS is denoted as z₂. As shown by reference number 604, the second TRP may calculate on multiple subcarriers, and derive an inter-TRP phase offsetper wideband or subband. The second TRP may measure the phase offsetbetween the first TRP and the second TRP based at least in part on z₁ (k) and z₂ (k) across subcarriers k=1, …, K over an entire bandwidth. In other words, the second TRP may calculate the phase offsetbased at least in part on z₁ and/or z₂. When a TAE is negligible (e.g., less than 10 nsec) , may be wideband averaged. Otherwise, may be reported per subband. As shown by reference number 606, each TRP may transmit a normal non-precoded DL-RS, such as a single-port CSI-RS, to the UE, in accordance with:

For example, the first TRP may transmit a normal (non-precoded) CSI-RS 1 to the UE (denoted as y₁) , and the second TRP may transmit a normal (non-precoded) CSI-RS 2 to the UE (denoted as y₂) . As shown by reference number 608, the UE may calculate on multiple subcarriers, and the UE may derive the inter-TRP phase offset (or TAE) per wideband or subband. The UE may measure the phase offsetbetween the first TRP and the second TRP based at least in part on y₁ (k) and y₂ (k) across subcarriers k=1, …, K over the entire bandwidth. In other words, the UE may determine the inter-TRP phase offset based at least in part on y₁ and y₂. When the TAE is negligible (e.g., less than 10 nsec) , may be wideband averaged. Otherwise, may be reported per subband. The UE may determine the inter-TRP phase offset based at least in part on a UE measurement behavior, which may depend on the CSI-RS being not precoded. As shown by reference number 610, the UE may reportto the second TRP. The UE may reportbased at least in part on a reporting of measurement results. In some examples, the UE may reportto the second TRP using a different approach, such that multiple approaches may be possible for reportingto the second TRP. As shown by reference number 612, the first TRP and/or the second TRP may derive the inter-TRP phase offset as:

In some examples, the UE may derive the inter-TRP phase offset using a different approach (e.g., using a different equation) , such that multiple approaches may be possible for deriving the inter-TRP phase offset. As shown by reference number 614, the second TRP may synchronize to the first TRP with a wideband/subband φ_TRP2to1. The second TRP may synchronize to the first TRP based at least in part on thereceived from the UE. In other words, one of the TRPs may be synchronized with the other TRP. In some examples, the second TRP may synchronize with the first TRP using a different approach, such that multiple approaches may be possible for synchronization between the first TRP and the second TRP.

As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with regard to Fig. 6.

A TRP may or may not precode a CSI-RS with a measureddepending on a network implementation. In a first scheme, the CSI-RS may be precoded with (e.g., a precoded CSI-RS) and a channel may be canceled. In a second scheme, a normal CSI-RS (e.g., a CSI-RS that is not precoded withor a non-precoded CSI-RS) may be employed and a channel may not be canceled. For the first scheme and the second scheme, a UE measurement behavior and a report content may be either the same or similar, or different, depending on a standard design and/or a UE implementation. For example, in the first scheme, the UE may need to calculate an initial phase φ_TRP2to1 by removing a TAE (τ_TRP2to1) , whereas in the second scheme, the UE may only need to measure a phase by averaging subcarriers across an entire wideband/subband. In some cases, the TAE may be relatively small (e.g., less than 10 nsec) , in which case the first scheme (only initial phase) and the second scheme (only wideband phase) may become similar, which may result in the same UE measurement behavior and reporting. As another example, the second scheme may not support measurements with multiple non-coherent UE antennas, unlike the first scheme. However, in some cases, the UE may be configured to use only one antenna, in which case the first scheme and the second scheme may become similar and may result in the same UE measurement behavior and reporting. Since the UE measurement behavior and the report content may be the same/similar or different, and since in some cases the first scheme and the second scheme become similar, UE-known or UE-transparent schemes may need to be supported.

In various aspects of techniques and apparatuses described herein, a UE may transmit, to a TRP, an SRS. The UE may receive, from the TRP, a CSI-RS. The CSI-RS may be a precoded CSI-RS based at least in part on the SRS, or the CSI-RS may be a non-precoded CSI-RS. The UE may identify a report configuration, where the UE may be implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration. The UE may identify a plurality of configured CSI-RS measurement resources, where the UE may be implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources. The UE may receive, from the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS. The UE may perform a UE measurement behavior and report, to the TRP, measurement results based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS. The UE may adjust its measurement behavior and report content based at least in part on an implicit indication or an explicit indication of whether the CSI-RS is precoded or not precoded.

Fig. 7 is a diagram illustrating an example 700 associated with UE measurement behavior and reporting depending on whether a received CSI-RS is precoded, in accordance with the present disclosure. As shown in Fig. 7, example 700 includes communication between a UE (e.g., UE 120) and a network node (e.g., network node 110) . In some aspects, the UE and the network node may be included in a wireless network, such as wireless network 100. The network node may be associated with one or more TRPs.

As shown by reference number 702, the UE may transmit, to a TRP associated with the network node, an SRS. The UE may transmit the SRS in an uplink direction. The UE may use a single antenna or transceiver to transmit a single SRS port. The UE may transmit the SRS similar to as described with respect to reference numbers 402, 502, 602.

As shown by reference number 704, the UE may receive, from the TRP, a CSI-RS. The CSI-RS may be a precoded CSI-RS based at least in part on the SRS. In other words, the TRP may precode the CSI-RS based at least in part on the SRS received from the UE. Alternatively, the CSI-RS may be a non-precoded CSI-RS. In this case, the TRP may not precode the CSI-RS based at least in part on the SRS received from the UE. The UE may receive the precoded CSI-RS similar to as described with respect to reference numbers 404, 504.

In some aspects, the UE may identify a report configuration. A “report configuration” may refer to a configuration of a specific piece of information, which the UE may report to the network node. In other words, the report configuration may refer to various parameters which the UE may report to the network node. The report configuration may be a CSI report configuration information element (IE) or another type of message. The UE may be implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration. The report configuration may indicate a range of a timing offset. The report configuration may indicate a granularity of a timing offset. The report configuration may indicate a timing offset, where the timing offset may be configured as a phase slope over a frequency domain, or the timing offset may not be configured as the phase slope over the frequency domain. The report configuration may indicate a number of subband phases. The report configuration may indicate an in/out-of cyclic prefix (CP) indicator. The report configuration may indicate one or more SRS port indices. The report configuration may include various fields to indicate the range of the timing offset, the timing offset, the number of subband phases, the in/out-of CP indicator, and/or the one or more SRS port indices. In one example, the report configuration may include a report quantity field, or multiple report quantity fields, to indicate the range of the timing offset, the timing offset, the number of subband phases, the in/out-of CP indicator, and/or the one or more SRS port indices. However, in other samples, other or different fields may be used.

In some aspects, the UE may identify a plurality of configured CSI-RS measurement resources. A “CSI-RS measurement resource” may be a time-frequency resource on which a CSI-RS is transmitted by the network node, where the CSI-RS may be measured by the UE. The UE may be implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources. The plurality of configured CSI-RS measurement resources may be associated with one or more SRS ports. The plurality of configured CSI-RS measurement resources may be associated with one or more configured CSI-RS measurement resources per TRP.

In some aspects, the UE may determine, either implicitly or explicitly, whether a measured CSI-RS from the TRP (or multiple measured CSI-RSs from multiple TRPs) is precoded based at least in part on a phase of a corresponding SRS received by the TRPs (or corresponding SRS received by the multiple TRPs) . In other words, in some cases, the TRP may or may not precode the CSI-RS based at least in part on the phase of the corresponding SRS received by the TRP, and whether or not the TRP precodes the CSI-RS may be implicit or explicit to the UE. The TRP may transmit the precoded CSI-RS to the UE, or the TRP may transmit the non-precoded CSI-RS to the UE, and whether or not the CSI-RS is precoded may be implicit or explicit to the UE. In an implicit approach, an implicit configuration may depend on report configurations, or the implicit configuration may depend on configured CSI-RS measurement resources. For example, the precoded CSI-RS may be associated with a first report configuration, whereas the non-precoded CSI-RS may be associated with a second report configuration. As another example, the precoded CSI-RS may be associated with a first CSI-RS measurement resource, whereas the non-precoded CSI-RS may be associated with a second CSI-RS measurement resource. The configured CSI-RS measurement resources may allow the UE to report, to the TRP, an inter-TRP timing offset and/or phase offset. In an explicit approach, the UE may receive an explicit indication from the TRP, where the explicit indication may indicate whether or not the CSI-RS transmitted by the TRP is precoded. In other words, the UE may receive, from the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In some aspects, the configured report parameters may be used to allow the UE to implicitly determine whether the CSI-RS received from the TRP (e.g., the measured CSI-RS) is precoded based at least in part on a phase of a corresponding SRS received by the TRP. In other words, depending on the configured report parameters, the UE may implicitly determine whether the CSI-RS is a precoded CSI-RS or a non-precoded CSI-RS. In some aspects, when a range of a timing offset is no larger than a threshold (e.g., 2 μsec) , the UE may assume that the CSI-RS is precoded. When the range of the timing offset is larger than the threshold, the UE may assume that the CSI-RS is not precoded. A timing/delay offset D_n, which may be associated with the non-precoded CSI-RS, may include a channel propagation delay, where the timing/delay offset D_n or the channel propagation delay may be larger than a TAE associated with a precoded CSI-RS. In some aspects, when a granularity of a timing offset is finer than a threshold (e.g., smaller than 30 nsec) , the UE may assume that the CSI-RS is precoded. When the granularity of the timing offset is not finer than the threshold, the UE may assume that the CSI-RS is not precoded. The TAE associated with the precoded CSI-RS may need more precise quantization to reflect a phase offset variation over a wideband, whereas the non-precoded CSI-RS may have per subband phases.

In some aspects, when a timing offset is configured as a phase slope over a frequency domain (e.g., a phase within a frequency unit) , the UE may assume that the CSI-RS is precoded. When the timing offset is not configured as the phase slope over the frequency domain, the UE may assume that the CSI-RS is not precoded. In some aspects, when report parameters include more than a threshold number of subband phases (e.g., more than 1, 2, or 3 subband phases) , the UE may assume that the CSI-RS is not precoded. When the report parameters include less than the threshold number of subband phases, the UE may assume that the CSI-RS is precoded. In some aspects, when the report parameters include the in/out-of CP indicator, the UE may assume that the CSI-RS is not precoded. When the report parameters do not include the in/out-of CP indicator, the UE may assume that the CSI-RS is precoded. In some aspects, when the report parameters include the SRS port index/indices, the UE may assume that the CSI-RS is not precoded. When the report parameters do not include the SRS port index/indices, the UE may assume that the CSI-RS is precoded.

In some aspects, for an aperiodic standalone CJT calibration reporting, given N_TRP configured non-zero-power (NZP) CSI-RS resources/resource sets and a selected N resources/resource sets, reporting, in one CSI reporting instance, { (D_n, offset, d_n) , n=0, 1, …, N-1} may be supported, where D_n, offset is a B-bit indicator representing a delay offset associated with an n-th CSI-RS resource/resource set. The value of D_n, offset indicates an interval [δ_i, δ_i+1) that the delay offset falls into. Further, may be uniformly spaced between 0 and A_D, e.g., with M_D=2^B and represent ‘out-of-range’ . Further, d_n may be a 1-bit indicator associated with the n-th CSI-RS resource/resource set, indicating whether a measured delay offset, plus a delay spread, is inside or outside a pre-defined range/interval. The pre-defined range (s) (e.g., CP length or its multiple) may be defined.

In some aspects, various conditions may be used to allow the UE to implicitly determine whether the CSI-RS received from the TRP (e.g., the measured CSI-RS) is precoded based at least in part on a phase of a corresponding SRS received by the TRP. In some aspects, when more than one configured SRS port is linked to measurement CSI-RSs, the UE may assume that the CSI-RS is precoded. When more than one configured SRS port is not linked to measurement CSI-RSs, the UE may assume that the CSI-RS is not precoded. In some aspects, when more than one measurement CSI-RS exists per TRP (e.g., per CSI-RS set/group) , the UE may assume that the CSI-RS is precoded. When more than one measurement CSI-RS does not exist per TRP, the UE may assume that the CSI-RS is not precoded. The more than one measurement CSI-RS associated with a same TRP (e.g., a same CSI-RS set/group) may be linked to different SRS ports.

In some aspects, for the aperiodic standalone CJT calibration reporting, when a report quantity (ReportQuantity) is ‘cjtc-P’ (DL/UL phase offset) , and for a given phase offset reporting configuration, the UE may be configured with Q associated SRS resource (s) for antenna switching, where various supported values may be defined for Q. The UE may be configured via higher layer or RRC signaling. A UE antenna port for transmitting a selected/configured port from one or more associated SRS resources may be the same as a UE antenna port for receiving a CSI-RS configured for phase offset measurement.

In some aspects, for the aperiodic standalone CJT calibration reporting, when the report quantity is ‘cjtc-P’ (DL/UL phase offset) , the UE may determine an SRS port corresponding to a ‘reference UE antenna port’ . In a first alternative, the UE may be configured with one or more SRS ports selected from a plurality of SRS ports from a configured Q associated SRS resources for phase offset reporting. The UE may be configured by the network node via higher layer or RRC signaling. In a second alternative, the UE may select one or more SRS ports out of the plurality of SRS ports across Q resources, and the UE may include a selection of the one or more SRS ports in a phase offset report. In some cases, further restrictions may be defined to limit a time gap between a received CSI-RS and a transmitted associated SRS.

In some aspects, when the CSI-RS is the non-precoded CSI-RS, the UE may transmit, to the TRP, an indication that indicates a capability of the UE to report an in/out-of CP indicator, and/or or a number of in/out-of CP indicators that the UE is capable of reporting. In some aspects, when the CSI-RS is the non-precoded CSI-RS, the UE may transmit, to the TRP, an indication that indicates a capability of the UE to report more than one SRS port index.

In some aspects, the UE may report, to the TRP, a capability on whether the UE is able to report the in/out-of CP indicator. The UE may report, to the network node, a capability on a number of in/out-of CP indicators that the UE is able to report. Such a report may require the UE to estimate a delay spread, which may be more complex than estimating the delay offset. An out-of-CP may require the UE to use multiple FFT windows for receiving a CSI-RS. In some aspects, the UE may report, to the network node, a capability indicating that the UE supports the explicit indication. The capability may indicate whether the UE is able to report more than one SRS port indices, since from a UE implementation perspective, the more than one corresponding UE antennas need to be Rx-Tx phase coherent.

As shown by reference number 706, the UE may perform a UE measurement behavior and report measurement results based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS. “UE measurement behavior” may refer to specific measurements that may be performed by the UE, which may depend on whether the CSI-RS is precoded or not precoded. For example, when the CSI-RS is precoded, the UE may calculate an inter-TRP timing offset and phase offset, and the UE may report the inter-TRP timing offset and phase offset to the TRP. As another example, when the CSI-RS is not precoded, the UE may calculate an inter-TRP phase offset per wideband or subband, and the UE may report the inter-TRP phase offset to the TRP. The specific measurements that may be performed by the UE are described with respect to Figs. 4-6. The “measurement results” that are reported by the UE may be measurements that area dependent on whether the CSI-RS is precoded or not precoded. Such measurement reports are further described with respect to Figs. 4-6. In some cases, when the CSI-RS is precoded, the UE may calculate an initial phase by removing a TAE, whereas when the CSI-RS is not precoded, the UE may measure a phase by averaging subcarriers across an entire wideband/subband. In some cases, when the CSI-RS is precoded, the UE may support measurements with multiple non-coherent UE antennas, whereas when the CSI-RS is not precoded, the UE may not support measurements with multiple non-coherent UE antennas.

Fig. 8 is a diagram illustrating an example 800 associated with UE measurement behavior and reporting depending on whether a received CSI-RS is precoded, in accordance with the present disclosure. As shown in Fig. 8, example 800 includes communication between a UE (e.g., UE 120) and a network node (e.g., network node 110) . In some aspects, the UE and the network node may be included in a wireless network, such as wireless network 100. The network node may be associated with one or more TRPs.

As shown by reference number 802, the UE may transmit, to a TRP associated with the network node, an SRS. The UE may transmit the SRS in an uplink direction. The UE may use a single antenna or transceiver to transmit a single SRS port. The UE may transmit the SRS similar to as described with respect to reference numbers 402, 502, 602.

As shown by reference number 804, the UE may receive, from the TRP, a CSI-RS. The CSI-RS may be a precoded CSI-RS based at least in part on the SRS. In other words, the TRP may precode the CSI-RS based at least in part on the SRS received from the UE. Alternatively, the CSI-RS may be a non-precoded CSI-RS. In this case, the TRP may not precode the CSI-RS based at least in part on the SRS received from the UE. The UE may receive the precoded CSI-RS similar to as described with respect to reference numbers 404, 504. The UE may receive the non-precoded CSI-RS similar to as described with respect to reference number 604.

As shown by reference number 806, the UE may transmit, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs. The report may indicate a set of report parameters associated with precoded CSI-RSs, and the set of report parameters may include an initial phase and/or a TAE. The report may indicate a set of report parameters associated with non-precoded CSI-RSs, and the set of report parameters may include a wideband phase, a subband phase, a delay offset, an in/out-of CP indicator, and/or an SRS port index. The report may indicate a superset of report parameters associated with both precoded CSI-RSs and non-precoded CSI-RSs. The UE may transmit the report without information on whether the CSI-RS received from the TRP is precoded or not precoded.

In some aspects, the UE may report, to the TRP, a set (e.g., a superset) of report parameters associated with both precoded CSI-RSs and normal non-precoded CSI-RSs. The set may include wideband/initial phases, subband phases, timing offsets, in/out-of CP indicators, and/or SRS port indexes, where the UE may obtain the reported parameters based at least in part on a UE implementation. For precoded CSI-RSs, the report parameters may include an initial phase and/or a TAE. For normal non-precoded CSI-RSs, the report parameters may include a wideband phase, a subband phase, a delay offset (D_n) , an in/out-of CP indicator (d_n) , and/or SRS port index/indices. In some cases, the initial phase and the wideband phase may be the same value, and/or the TAE and the delay offset may be the same value. In some aspects, the network node may not configure the UE to determine whether the CSI-RS is precoded or not precoded. Rather, the network node may configure the UE to report the set of report parameters associated with both precoded CSI-RSs and normal non-precoded CSI-RSs.

As indicated above, Fig. 8 is provided as an example. Other examples may differ from what is described with regard to Fig. 8.

Fig. 9 is a diagram illustrating an example process 900 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 900 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with UE measurement behavior and reporting depending on whether a received CSI-RS is precoded.

As shown in Fig. 9, in some aspects, process 900 may include transmitting, to a TRP, an SRS (block 910) . For example, the UE (e.g., using transmission component 1304 and/or communication manager 1306, depicted in Fig. 13) may transmit, to a TRP, an SRS, as described above.

As further shown in Fig. 9, in some aspects, process 900 may include receiving, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS (block 920) . For example, the UE (e.g., using reception component 1302 and/or communication manager 1306, depicted in Fig. 13) may receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS, as described above.

As further shown in Fig. 9, in some aspects, process 900 may include reporting a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS (block 930) . For example, the UE (e.g., using communication manager 1306, depicted in Fig. 13) may report a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS, as described above.

Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In a first aspect, process 900 includes identifying a report configuration, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration.

In a second aspect, alone or in combination with the first aspect, the report configuration indicates a range of a timing offset.

In a third aspect, alone or in combination with one or more of the first and second aspects, the report configuration indicates a granularity of a timing offset.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the report configuration indicates a timing offset, and the timing offset is possibly configured as a phase slope over a frequency domain.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the report configuration indicates a number of subband phases.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the report configuration indicates an in/out-of CP indicator.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the report configuration indicates one or more SRS port indices.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process 900 includes identifying a plurality of configured CSI- RS measurement resources, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the plurality of configured CSI-RS measurement resources are associated with one or more SRS ports.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the plurality of configured CSI-RS measurement resources are associated with one or more configured CSI-RS measurement resources per TRP.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, process 900 includes receiving, from the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the CSI-RS is the non-precoded CSI-RS, and process 900 includes transmitting, to the TRP, an indication that indicates one or more of a capability of the UE to report an in/out-of CP indicator, or a number of in/out-of CP indicators that the UE is capable of reporting.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the CSI-RS is the non-precoded CSI-RS, and process 900 includes transmitting, to the TRP, an indication that indicates a capability of the UE to report more than one SRS port index.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the measurement is one or more of: an inter-TRP timing offset, a phase offset, or an inter-TRP phase offset per wideband or subband, depending on whether the CSI-RS is precoded or not precoded

Although Fig. 9 shows example blocks of process 900, in some aspects, process 900 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 9. Additionally, or alternatively, two or more of the blocks of process 900 may be performed in parallel.

Fig. 10 is a diagram illustrating an example process 1000 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 1000 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with UE measurement behavior and reporting depending on whether a received CSI-RS is precoded.

As shown in Fig. 10, in some aspects, process 1000 may include transmitting, to a TRP, an SRS (block 1010) . For example, the UE (e.g., using transmission component 1304 and/or communication manager 1306, depicted in Fig. 13) may transmit, to a TRP, an SRS, as described above.

As further shown in Fig. 10, in some aspects, process 1000 may include receiving, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS (block 1020) . For example, the UE (e.g., using reception component 1302 and/or communication manager 1306, depicted in Fig. 13) may receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS, as described above.

As further shown in Fig. 10, in some aspects, process 1000 may include transmitting, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs (block 1030) . For example, the UE (e.g., using transmission component 1304 and/or communication manager 1306, depicted in Fig. 13) may transmit, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs, as described above.

Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In a first aspect, the report indicates a set of report parameters associated with precoded CSI-RSs, and the set of report parameters includes an initial phase and a timing misalignment error.

In a second aspect, alone or in combination with the first aspect, the report indicates a set of report parameters associated with non-precoded CSI-RSs, and the set of report parameters includes a wideband phase, a subband phase, a delay offset, an in/out-of CP indicator, and an SRS port index.

In a third aspect, alone or in combination with one or more of the first and second aspects, the report indicates a superset of report parameters associated with both precoded CSI-RSs and non-precoded CSI-RSs.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, process 1000 includes transmitting the report without information on whether the CSI-RS received from the TRP is precoded or not precoded.

Although Fig. 10 shows example blocks of process 1000, in some aspects, process 1000 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 10. Additionally, or alternatively, two or more of the blocks of process 1000 may be performed in parallel.

Fig. 11 is a diagram illustrating an example process 1100 performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure. Example process 1100 is an example where the apparatus or the network node (e.g., network node 110) performs operations associated with UE measurement behavior and reporting depending on whether a received CSI-RS is precoded.

As shown in Fig. 11, in some aspects, process 1100 may include receiving, via a TRP associated with the network node, an SRS (block 1110) . For example, the network node (e.g., using reception component 1402 and/or communication manager 1406, depicted in Fig. 14) may receive, via a TRP associated with the network node, an SRS, as described above.

As further shown in Fig. 11, in some aspects, process 1100 may include transmitting, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS (block 1120) . For example, the network node (e.g., using transmission component 1404 and/or communication manager 1406, depicted in Fig. 14) may transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS, as described above.

As further shown in Fig. 11, in some aspects, process 1100 may include receiving, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a UE measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS (block 1130) . For example, the network node (e.g., using reception component 1402 and/or communication manager 1406, depicted in Fig. 14) may receive, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a UE measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS, as described above.

Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In a first aspect, process 1100 includes identifying a report configuration, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration.

In a third aspect, alone or in combination with one or more of the first and second aspects, the report configuration indicates is a granularity of a timing offset.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the report configuration indicates is a timing offset, and the timing offset is possibly configured as a phase slope over a frequency domain.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the report configuration indicates is an in/out-of CP indicator.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process 1100 includes identifying a plurality of configured CSI-RS measurement resources, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, process 1100 includes transmitting, via the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the CSI-RS is the non-precoded CSI-RS, and process 1100 includes receiving, via the TRP, an indication that indicates one or more of a capability of the UE to report an in/out-of CP indicator, or a number of in/out-of CP indicators that the UE is capable of reporting.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the CSI-RS is the non-precoded CSI-RS, and process 1100 includes receiving, via the TRP, an indication that indicates a capability of the UE to report more than one SRS port index.

Although Fig. 11 shows example blocks of process 1100, in some aspects, process 1100 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 11. Additionally, or alternatively, two or more of the blocks of process 1100 may be performed in parallel.

Fig. 12 is a diagram illustrating an example process 1200 performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure. Example process 1200 is an example where the apparatus or the network node (e.g., network node 110) performs operations associated with UE measurement behavior and reporting depending on whether a received CSI-RS is precoded.

As shown in Fig. 12, in some aspects, process 1200 may include receiving, via a TRP associated with the network node, an SRS (block 1210) . For example, the network node (e.g., using reception component 1402 and/or communication manager 1406, depicted in Fig. 14) may receive, via a TRP associated with the network node, an SRS, as described above.

As further shown in Fig. 12, in some aspects, process 1200 may include transmitting, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS (block 1220) . For example, the network node (e.g., using transmission component 1404 and/or communication manager 1406, depicted in Fig. 14) may transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS, as described above.

As further shown in Fig. 12, in some aspects, process 1200 may include receiving, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs (block 1230) . For example, the network node (e.g., using reception component 1402 and/or communication manager 1406, depicted in Fig. 14) may receive, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs, as described above.

Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In a first aspect, the report indicates a set of report parameters associated with precoded CSI-RSs, and the set of report parameters include an initial phase and a timing misalignment error.

In a second aspect, alone or in combination with the first aspect, the report indicates a set of report parameters associated with non-precoded CSI-RSs, and the set of report parameters include a wideband phase, a subband phase, a delay offset, an in/out-of CP indicator, and an SRS port index.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, process 1200 includes transmitting the report without information on whether the CSI-RS received from the TRP is precoded or not precoded.

Although Fig. 12 shows example blocks of process 1200, in some aspects, process 1200 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 12. Additionally, or alternatively, two or more of the blocks of process 1200 may be performed in parallel.

Fig. 13 is a diagram of an example apparatus 1300 for wireless communication, in accordance with the present disclosure. The apparatus 1300 may be a UE, or a UE may include the apparatus 1300. In some aspects, the apparatus 1300 includes a reception component 1302, a transmission component 1304, and/or a communication manager 1306, which may be in communication with one another (for example, via one or more buses and/or one or more other components) . In some aspects, the communication manager 1306 is the communication manager 140 described in connection with Fig. 1. As shown, the apparatus 1300 may communicate with another apparatus 1308, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1302 and the transmission component 1304.

In some aspects, the apparatus 1300 may be configured to perform one or more operations described herein in connection with Figs. 7-8. Additionally, or alternatively, the apparatus 1300 may be configured to perform one or more processes described herein, such as process 900 of Fig. 9, process 1000 of Fig. 10, or a combination thereof. In some aspects, the apparatus 1300 and/or one or more components shown in Fig. 13 may include one or more components of the UE described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 13 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by one or more controllers or one or more processors to perform the functions or operations of the component.

The reception component 1302 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1308. The reception component 1302 may provide received communications to one or more other components of the apparatus 1300. In some aspects, the reception component 1302 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples) , and may provide the processed signals to the one or more other components of the apparatus 1300. In some aspects, the reception component 1302 may include one or more antennas, one or more modems, one or more demodulators, one or more MIMO detectors, one or more receive processors, one or more controllers/processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 2.

The transmission component 1304 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1308. In some aspects, one or more other components of the apparatus 1300 may generate communications and may provide the generated communications to the transmission component 1304 for transmission to the apparatus 1308. In some aspects, the transmission component 1304 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) , and may transmit the processed signals to the apparatus 1308. In some aspects, the transmission component 1304 may include one or more antennas, one or more modems, one or more modulators, one or more transmit MIMO processors, one or more transmit processors, one or more controllers/processors, one or more memories, or a combination thereof, of the UE described in connection with Fig. 2. In some aspects, the transmission component 1304 may be co-located with the reception component 1302 in one or more transceivers.

The communication manager 1306 may support operations of the reception component 1302 and/or the transmission component 1304. For example, the communication manager 1306 may receive information associated with configuring reception of communications by the reception component 1302 and/or transmission of communications by the transmission component 1304. Additionally, or alternatively, the communication manager 1306 may generate and/or provide control information to the reception component 1302 and/or the transmission component 1304 to control reception and/or transmission of communications.

The transmission component 1304 may transmit, to a TRP, an SRS. The reception component 1302 may receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS. The communication manager 1306 may report a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

The communication manager 1306 may identify a report configuration, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration. The communication manager 1306 may identify a plurality of configured CSI-RS measurement resources, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources. The reception component 1302 may receive, from the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

The transmission component 1304 may transmit, to a TRP, an SRS. The reception component 1302 may receive, from the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS. The transmission component 1304 may transmit, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

The number and arrangement of components shown in Fig. 13 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 13. Furthermore, two or more components shown in Fig. 13 may be implemented within a single component, or a single component shown in Fig. 13 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 13 may perform one or more functions described as being performed by another set of components shown in Fig. 13.

Fig. 14 is a diagram of an example apparatus 1400 for wireless communication, in accordance with the present disclosure. The apparatus 1400 may be a network node, or a network node may include the apparatus 1400. In some aspects, the apparatus 1400 includes a reception component 1402, a transmission component 1404, and/or a communication manager 1406, which may be in communication with one another (for example, via one or more buses and/or one or more other components) . In some aspects, the communication manager 1406 is the communication manager 150 described in connection with Fig. 1. As shown, the apparatus 1400 may communicate with another apparatus 1408, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1402 and the transmission component 1404.

In some aspects, the apparatus 1400 may be configured to perform one or more operations described herein in connection with Figs. 7-8. Additionally, or alternatively, the apparatus 1400 may be configured to perform one or more processes described herein, such as process 1100 of Fig. 11, process 1200 of Fig. 12, or a combination thereof. In some aspects, the apparatus 1400 and/or one or more components shown in Fig. 14 may include one or more components of the network node described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 14 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by one or more controllers or one or more processors to perform the functions or operations of the component.

The reception component 1402 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1408. The reception component 1402 may provide received communications to one or more other components of the apparatus 1400. In some aspects, the reception component 1402 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples) , and may provide the processed signals to the one or more other components of the apparatus 1400. In some aspects, the reception component 1402 may include one or more antennas, one or more modems, one or more demodulators, one or more MIMO detectors, one or more receive processors, one or more controllers/processors, one or more memories, or a combination thereof, of the network node described in connection with Fig. 2. In some aspects, the reception component 1402 and/or the transmission component 1404 may include or may be included in a network interface. The network interface may be configured to obtain and/or output signals for the apparatus 1400 via one or more communications links, such as a backhaul link, a midhaul link, and/or a fronthaul link.

The transmission component 1404 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1408. In some aspects, one or more other components of the apparatus 1400 may generate communications and may provide the generated communications to the transmission component 1404 for transmission to the apparatus 1408. In some aspects, the transmission component 1404 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) , and may transmit the processed signals to the apparatus 1408. In some aspects, the transmission component 1404 may include one or more antennas, one or more modems, one or more modulators, one or more transmit MIMO processors, one or more transmit processors, one or more controllers/processors, one or more memories, or a combination thereof, of the network node described in connection with Fig. 2. In some aspects, the transmission component 1404 may be co-located with the reception component 1402 in one or more transceivers.

The communication manager 1406 may support operations of the reception component 1402 and/or the transmission component 1404. For example, the communication manager 1406 may receive information associated with configuring reception of communications by the reception component 1402 and/or transmission of communications by the transmission component 1404. Additionally, or alternatively, the communication manager 1406 may generate and/or provide control information to the reception component 1402 and/or the transmission component 1404 to control reception and/or transmission of communications.

The reception component 1402 may receive, via a TRP associated with the network node, an SRS. The transmission component 1404 may transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS. The reception component 1402 may receive, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a UE measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

The communication manager 1406 may identify a report configuration, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration. The communication manager 1406 may identify a plurality of configured CSI-RS measurement resources, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources. The transmission component 1404 may transmit, via the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

The reception component 1402 may receive, via a TRP associated with the network node, an SRS. The transmission component 1404 may transmit, via the TRP, a CSI-RS, wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS. The reception component 1402 may receive, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

The number and arrangement of components shown in Fig. 14 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 14. Furthermore, two or more components shown in Fig. 14 may be implemented within a single component, or a single component shown in Fig. 14 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 14 may perform one or more functions described as being performed by another set of components shown in Fig. 14.

The following provides an overview of some Aspects of the present disclosure:

Aspect 1: A method of wireless communication performed by a user equipment (UE) , comprising: transmitting, to a transmission reception point (TRP) , a sounding reference signal (SRS) ; receiving, from the TRP, a channel state information reference signal (CSI-RS) , wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and reporting a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS, wherein the measurement is one or more of: an inter-TRP timing offset, a phase offset, or an inter-TRP phase offset per wideband or subband, depending on whether the CSI-RS is precoded or not precoded.

Aspect 2: The method of Aspect 1, further comprising: identifying a report configuration, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration.

Aspect 3: The method of Aspect 2, wherein the report configuration indicates a range of a timing offset.

Aspect 4: The method of Aspect 2, wherein the report configuration indicates a granularity of a timing offset.

Aspect 5: The method of Aspect 2, wherein the report configuration indicates a timing offset, and wherein the timing offset is possibly configured as a phase slope over a frequency domain.

Aspect 6: The method of Aspect 2, wherein the report configuration indicates a number of subband phases.

Aspect 7: The method of Aspect 2, wherein the report configuration indicates an in/out-of cyclic prefix indicator.

Aspect 8: The method of Aspect 2, wherein the report configuration indicates one or more SRS port indices.

Aspect 9: The method of any of Aspects 1-8, further comprising: identifying a plurality of configured CSI-RS measurement resources, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources.

Aspect 10: The method of Aspect 9, wherein the plurality of configured CSI-RS measurement resources are associated with one or more SRS ports.

Aspect 11: The method of Aspect 9, wherein the plurality of configured CSI-RS measurement resources are associated with one or more configured CSI-RS measurement resources per TRP.

Aspect 12: The method of any of Aspects 1-11, further comprising: receiving, from the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

Aspect 13: The method of any of Aspects 1-12, wherein the CSI-RS is the non-precoded CSI-RS, and further comprising: transmitting, to the TRP, an indication that indicates one or more of: a capability of the UE to report an in/out-of cyclic prefix indicator, or a number of in/out-of cyclic prefix indicators that the UE is capable of reporting.

Aspect 14: The method of any of Aspects 1-13, wherein the CSI-RS is the non-precoded CSI-RS, and further comprising: transmitting, to the TRP, an indication that indicates a capability of the UE to report more than one SRS port index.

Aspect 15: A method of wireless communication performed by a user equipment (UE) , comprising: transmitting, to a transmission reception point (TRP) , a sounding reference signal (SRS) ; receiving, from the TRP, a channel state information reference signal (CSI-RS) , wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and transmitting, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

Aspect 16: The method of Aspect 15, wherein the report indicates a set of report parameters associated with precoded CSI-RSs, and the set of report parameters include an initial phase and a timing misalignment error.

Aspect 17: The method of any of Aspects 15-16, wherein the report indicates a set of report parameters associated with non-precoded CSI-RSs, and the set of report parameters include a wideband phase, a subband phase, a delay offset, an in/out-of cyclic prefix indicator, and an SRS port index.

Aspect 18: The method of any of Aspects 15-17, wherein the report indicates a superset of report parameters associated with both precoded CSI-RSs and non-precoded CSI-RSs.

Aspect 19: The method of any of Aspects 15-18, wherein transmitting the report comprises transmitting the report without information on whether the CSI-RS received from the TRP is precoded or not precoded.

Aspect 20: A method of wireless communication performed by a network node, comprising: receiving, via a transmission reception point (TRP) associated with the network node, a sounding reference signal (SRS) ; transmitting, via the TRP, a channel state information reference signal (CSI-RS) , wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receiving, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a user equipment (UE) measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

Aspect 21: The method of Aspect 20, further comprising: identifying a report configuration, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration.

Aspect 22: The method of Aspect 21, wherein the report configuration indicates a range of a timing offset.

Aspect 23: The method of Aspect 21, wherein the report configuration indicates a granularity of a timing offset.

Aspect 24: The method of Aspect 21, wherein the report configuration indicates a timing offset, and wherein the timing offset is possibly configured as a phase slope over a frequency domain.

Aspect 25: The method of Aspect 21, wherein the report configuration indicates a number of subband phases.

Aspect 26: The method of Aspect 21, wherein the report configuration indicates an in/out-of cyclic prefix indicator.

Aspect 27: The method of Aspect 21, wherein the report configuration indicates one or more SRS port indices.

Aspect 28: The method of any of Aspects 20-27, further comprising: identifying a plurality of configured CSI-RS measurement resources, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources.

Aspect 29: The method of Aspect 28, wherein the plurality of configured CSI-RS measurement resources are associated with one or more SRS ports.

Aspect 30: The method of Aspect 28, wherein the plurality of configured CSI-RS measurement resources are associated with one or more configured CSI-RS measurement resources per TRP.

Aspect 31: The method of any of Aspects 20-30, further comprising: transmitting, via the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.

Aspect 32: The method of any of Aspects 20-31, wherein the CSI-RS is the non-precoded CSI-RS, and further comprising: receiving, via the TRP, an indication that indicates one or more of: a capability of the UE to report an in/out-of cyclic prefix indicator, or a number of in/out-of cyclic prefix indicators that the UE is capable of reporting.

Aspect 33: The method of any of Aspects 20-32, wherein the CSI-RS is the non-precoded CSI-RS, and further comprising: receiving, via the TRP, an indication that indicates a capability of the UE to report more than one SRS port index.

Aspect 34: A method of wireless communication performed by a network node, comprising: receiving, via a transmission reception point (TRP) associated with the network node, a sounding reference signal (SRS) ; transmitting, via the TRP, a channel state information reference signal (CSI-RS) , wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and receiving, via the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.

Aspect 35: The method of Aspect 34, wherein the report indicates a set of report parameters associated with precoded CSI-RSs, and the set of report parameters include an initial phase and a timing misalignment error.

Aspect 36: The method of any of Aspects 34-35, wherein the report indicates a set of report parameters associated with non-precoded CSI-RSs, and the set of report parameters include a wideband phase, a subband phase, a delay offset, an in/out-of cyclic prefix indicator, and an SRS port index.

Aspect 37: The method of any of Aspects 34-36, wherein the report indicates a superset of report parameters associated with both precoded CSI-RSs and non-precoded CSI-RSs.

Aspect 38: The method of any of Aspects 34-37, wherein transmitting the report comprises transmitting the report without information on whether the CSI-RS received from the TRP is precoded or not precoded.

Aspect 39: An apparatus for wireless communication at a device, the apparatus comprising one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to perform the method of one or more of Aspects 1-19.

Aspect 40: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors configured to cause the device to perform the method of one or more of Aspects 1-19.

Aspect 41: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-19.

Aspect 42: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform the method of one or more of Aspects 1-19.

Aspect 43: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-19.

Aspect 44: A device for wireless communication, the device comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-19.

Aspect 45: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 1-19.

Aspect 46: An apparatus for wireless communication at a device, the apparatus comprising one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to perform the method of one or more of Aspects 20-38.

Aspect 47: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors configured to cause the device to perform the method of one or more of Aspects 20-38.

Aspect 48: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 20-38.

Aspect 49: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform the method of one or more of Aspects 20-38.

Aspect 50: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 20-38.

Aspect 51: A device for wireless communication, the device comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 20-38.

Aspect 52: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 20-38.

The foregoing disclosure provides illustration and description but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construed as hardware or a combination of hardware and at least one of software or firmware. “Software” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a “processor” is implemented in hardware or a combination of hardware and software. It will be apparent that systems or methods described herein may be implemented in different forms of hardware or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems or methods is not limiting of the aspects. Thus, the operation and behavior of the systems or methods are described herein without reference to specific software code, because those skilled in the art will understand that software and hardware can be designed to implement the systems or methods based, at least in part, on the description herein. A component being configured to perform a function means that the component has a capability to perform the function, and does not require the function to be actually performed by the component, unless noted otherwise.

As used herein, “satisfying a threshold” may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, or not equal to the threshold, among other examples.

As used herein, a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiples of the same element (for example, a + a, a + a + a, a + a + b, a + a + c, a + b + b, a + c + c, b + b, b + b + b, b + b + c, c + c, and c + c + c, or any other ordering of a, b, and c) .

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more. ” Further, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the one or more. ” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items and may be used interchangeably with “one or more. ” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has, ” “have, ” “having, ” and similar terms are intended to be open-ended terms that do not limit an element that they modify (for example, an element “having” A may also have B) . Further, the phrase “based on” is intended to mean “based on or otherwise in association with” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and/or, ” unless explicitly stated otherwise (for example, if used in combination with “either” or “only one of” ) . It should be understood that “one or more” is equivalent to “at least one. ”

Even though particular combinations of features are recited in the claims or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. Many of these features may be combined in ways not specifically recited in the claims or disclosed in the specification. The disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set.

Claims

An apparatus for wireless communication at a user equipment (UE) , comprising:

one or more memories; and

one or more processors, coupled to the one or more memories, configured to cause the UE to:

transmit, to a transmission reception point (TRP) , a sounding reference signal (SRS) ;

receive, from the TRP, a channel state information reference signal (CSI-RS) , wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and

report a measurement based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.
The apparatus of claim 1, wherein the one or more processors are further configured to cause the UE to:

identify a report configuration, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the report configuration.
The apparatus of claim 2, wherein the report configuration indicates a range of a timing offset or a granularity of the timing offset.
The apparatus of claim 2, wherein the report configuration indicates a timing offset, and wherein the timing offset is possibly configured as a phase slope over a frequency domain.
The apparatus of claim 2, wherein the report configuration indicates a number of subband phases.
The apparatus of claim 2, wherein the report configuration indicates an in/out-of cyclic prefix indicator.
The apparatus of claim 2, wherein the report configuration indicates one or more SRS port indices.
The apparatus of claim 1, wherein the one or more processors are further configured to cause the UE to:

identify a plurality of configured CSI-RS measurement resources, wherein the UE is implicitly configured as to whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS based at least in part on the plurality of configured CSI-RS measurement resources.
The apparatus of claim 9, wherein the plurality of configured CSI-RS measurement resources are associated with one or more SRS ports.
The apparatus of claim 9, wherein the plurality of configured CSI-RS measurement resources are associated with one or more configured CSI-RS measurement resources per TRP.
The apparatus of claim 1, wherein the one or more processors are further configured to cause the UE to:

receive, from the TRP, an indication that explicitly indicates whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.
The apparatus of claim 1, wherein the CSI-RS is the non-precoded CSI-RS, and the one or more processors are further configured to cause the UE to:

transmit, to the TRP, an indication that indicates one or more of: a capability of the UE to report an in/out-of cyclic prefix indicator, or a number of in/out-of cyclic prefix indicators that the UE is capable of reporting.
The apparatus of claim 1, wherein the CSI-RS is the non-precoded CSI-RS, and the one or more processors are further configured to cause the UE to:

transmit, to the TRP, an indication that indicates a capability of the UE to report more than one SRS port index.
The apparatus of claim 1, wherein the measurement is one or more of: an inter-TRP timing offset, a phase offset, or an inter-TRP phase offset per wideband or subband, depending on whether the CSI-RS is precoded or not precoded.
An apparatus for wireless communication at a user equipment (UE) , comprising:

one or more memories; and

one or more processors, coupled to the one or more memories, configured to cause the UE to:

transmit, to a transmission reception point (TRP) , a sounding reference signal (SRS) ;

receive, from the TRP, a channel state information reference signal (CSI-RS) , wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and

transmit, to the TRP, a report that indicates a plurality of report parameters associated with precoded CSI-RSs and non-precoded CSI-RSs.
The apparatus of claim 15, wherein the report indicates a set of report parameters associated with precoded CSI-RSs, and the set of report parameters include an initial phase and a timing misalignment error.
The apparatus of claim 15, wherein the report indicates a set of report parameters associated with non-precoded CSI-RSs, and the set of report parameters include a wideband phase, a subband phase, a delay offset, an in/out-of cyclic prefix indicator, and an SRS port index.
The apparatus of claim 15, wherein the report indicates a superset of report parameters associated with both precoded CSI-RSs and non-precoded CSI-RSs.
The apparatus of claim 15, wherein the one or more processors are configured to cause the UE to transmit the report without information on whether the CSI-RS received from the TRP is precoded or not precoded.
An apparatus for wireless communication at a network node, comprising:

one or more memories; and

one or more processors, coupled to the one or more memories, configured to cause the network node to:

receive, via a transmission reception point (TRP) associated with the network node, a sounding reference signal (SRS) ;

transmit, via the TRP, a channel state information reference signal (CSI-RS) , wherein the CSI-RS is a precoded CSI-RS based at least in part on the SRS, or the CSI-RS is a non-precoded CSI-RS; and

receive, via the TRP, a report that indicates a measurement associated with the CSI-RS, wherein a user equipment (UE) measurement behavior and reporting is based at least in part on whether the CSI-RS is the precoded CSI-RS or the non-precoded CSI-RS.