Implicit beam monitoring reference signal for ser-equipment-initiated, event-driven beam reporting
The use of a candidate beam monitoring RS resource set with QCL RS types addresses the challenge of sub-optimal RS selection in UE-initiated beam reporting, improving beam quality measurement and reducing data transfer latencies and errors in wireless communication systems.
Patent Information
- Application Number
- PCT/CN2024/109961
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2026-02-12
AI Technical Summary
Existing wireless communication systems face challenges in accurately monitoring beam quality due to sub-optimal selection of reference signals (RS) for UE-initiated, event-driven beam reporting, leading to increased data recovery errors, data transfer latencies, and decreased throughput.
Implementing a candidate beam monitoring RS resource set configured with quasi-co-located (QCL) RS types that provide increased spatial diversity, granularity, and resistance to interference, allowing the UE to implicitly select an RS for event-driven beam reporting based on predefined rules and selection criteria.
Enhances beam quality measurement metrics, reducing data recovery errors, data transfer latencies, and increasing data throughput by using more accurate and comprehensive beam management measurement metrics.
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Figure CN2024109961_12022026_PF_FP_ABST
Abstract
Description
IMPLICIT BEAM MONITORING REFERENCE SIGNAL FOR USER-EQUIPMENT-INITIATED, EVENT-DRIVEN BEAM REPORTING
[0001] FIELD OF THE DISCLOSURE
[0002] Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods for an implicit beam monitoring reference signal for user-equipment-initiated, event-driven beam reporting.BACKGROUND
[0003] 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 with33 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.
[0004] 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.SUMMARY
[0005] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE) . The method may include receiving, by the UE, a first indication of a candidate beam monitoring reference signal (RS) resource set designated for UE-initiated, event-driven beam reporting. The method may include receiving, by the UE, a second indication of a transmission configuration indicator (TCI) state that indicates a quasi-co-located (QCL) RS. The method may include selecting, by the UE, a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS. The method may include transmitting, by the UE, a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.
[0006] Some aspects described herein relate to a method of wireless communication performed by a network node. The method may include transmitting, by the network node, a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The method may include transmitting, by the network node, a second indication of a TCI state that indicates a QCL RS. The method may include receiving, by the network node, a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set.
[0007] Some aspects described herein relate to an apparatus for wireless communication at a UE. The apparatus may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors, individually or collectively and based at least in part on information stored in the one or more memories, being configured to receive a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The one or more processors may be configured to receive a second indication of a TCI state that indicates a QCL RS. The one or more processors may be configured to select a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS. The one or more processors may be configured to transmit a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.
[0008] Some aspects described herein relate to an apparatus for wireless communication at a network node. The apparatus may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors, individually or collectively and based at least in part on information stored in the one or more memories, being configured to transmit a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The one or more processors may be configured to transmit a second indication of a TCI state that indicates a QCL RS. The one or more processors may be configured to receive a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set.
[0009] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive a second indication of a TCI state that indicates a QCL RS. The set of instructions, when executed by one or more processors of the UE, may cause the UE to select a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS. The set of instructions, when executed by one or more processors of the UE, may cause the UE to transmit a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.
[0010] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a network node. The set of instructions, when executed by one or more processors of the network node, may cause the network node to transmit a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The set of instructions, when executed by one or more processors of the network node, may cause the network node to transmit a second indication of a TCI state that indicates a QCL RS. The set of instructions, when executed by one or more processors of the network node, may cause the network node to receive a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set.
[0011] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The apparatus may include means for receiving a second indication of a TCI state that indicates a QCL RS. The apparatus may include means for selecting a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS. The apparatus may include means for transmitting a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.
[0012] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for transmitting a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The apparatus may include means for transmitting a second indication of a TCI state that indicates a QCL RS. The apparatus may include means for receiving a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set.
[0013] 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.
[0014] 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.BRIEF DESCRIPTION OF THE DRAWINGS
[0015] 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.
[0016] Fig. 1 is a diagram illustrating an example of a wireless communication network, in accordance with the present disclosure.
[0017] Fig. 2 is a diagram illustrating an example network node in communication with an example user equipment (UE) in a wireless network, in accordance with the present disclosure.
[0018] Fig. 3 is a diagram illustrating an example disaggregated base station architecture, in accordance with the present disclosure.
[0019] Fig. 4 is a diagram illustrating an example of using beams for communications between a network node and a UE, in accordance with the present disclosure.
[0020] Fig. 5 is a diagram illustrating examples of beam management procedures, in accordance with the present disclosure.
[0021] Fig. 6 is a diagram illustrating an example of a wireless communication process between a network node and a UE, in accordance with the present disclosure.
[0022] Fig. 7 is a diagram illustrating an example process performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure.
[0023] Fig. 8 is a diagram illustrating an example process performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure.
[0024] Fig. 9 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.
[0025] Fig. 10 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.DETAILED DESCRIPTION
[0026] 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.
[0027] 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.
[0028] A user equipment (UE) may be configured to perform UE-initiated, event-driven beam reporting that results in the UE transmitting a beam management report based at least in part on identifying that a condition has been satisfied and / or that a certain event has occurred. To illustrate, the UE may monitor one or more reference signals (RSs) to assess whether a beam-reporting trigger condition has been met. Based at least in part on detecting that a beam-reporting condition has been met, the UE may generate and transmit an event-driven beam management report.
[0029] In UE-initiated, event-driven beam reporting, a UE may implicitly determine an RS to use for monitoring a current beam’s quality. That is, the UE may select the RS to use without receiving explicit instructions from a network node on which RS to use for UE-initiated, event-driven beam reporting. As one example, the UE may derive which RS to select based at least in part on an indicated transmission configuration indicator (TCI) state. However, in some cases, the RS derived from the indicated TCI state may be inadequate for monitoring beam quality and / or for generating a beam management measurement metric. To illustrate, the UE may implicitly select a tracking reference signal (TRS) . However, beam management measurement metrics generated using the TRS may not provide enough spatial diversity and / or granularity to assess beam quality for different beams. Alternatively, or additionally, the TRS may not be transmitted often enough and / or with a wide enough frequency band to provide comprehensive beam management measurement metrics. As yet another example, a TRS may be more susceptible to interference relative to other RS types, leading to less accurate beam management measurement metrics, relative to beam management measurement metrics generated using the other RS types. According, the implicit selection of an RS for UE-initiated, event-driven beam reporting may result in the UE selecting an RS type that leads to sub-optimal beam quality measurement metrics. The sub-optimal beam quality measurement metrics may be used to configure communication beams, resulting in increased data recovery errors, increased data transfer latencies, and / or decreased data throughput at the UE and / or in a wireless network.
[0030] Various aspects relate generally to an implicit beam monitoring RS for UE-initiated, event-driven beam reporting. Some aspects more specifically relate to a UE performing implicit selection of an RS from a candidate beam monitoring RS resource set using an association between a quasi-co-located (QCL) RS and the RS in the candidate beam monitoring RS resource set. In some aspects, a UE may receive a first indication of a candidate beam monitoring RS resource set, and the candidate beam monitoring RS resource set may be designated for UE-initiated, event-driven beam reporting. For instance, the candidate beam monitoring RS resource set may be configured with one or more RS types that may be used to generate one or more beam management measurement metrics that provide more beam management information relative to other RS types, such as beam management metrics that provide increased spatial diversity and / or granularity, are transmitted often enough and / or with a wide enough frequency band to provide comprehensive beam management measurement metrics, and / or are less susceptible to interference relative to the other RS types. That is, the candidate beam monitoring RS resource set may be configured with one or more RSs that may be used to generate one or more beam management measurement metrics that are accurate to within a first threshold and / or provide a granularity of information to within a second threshold that may be unattainable using a different RS type.
[0031] The UE may also receive a second indication of a TCI state that indicates one or more QCL RSs. In some aspects, based at least in part on the UE being configured to perform UE-initiated, event-driven beam reporting, the UE may select a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting. The UE may select the current RS based at least in part on an association between the current RS and the QCL RS indicated by the TCI state and / or may transmit a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS. In some aspects, the UE may select the current RS implicitly, where “implicit selection” may denote the UE selecting the current RS using predefined rules and / or selection criteria instead of through explicit signaling and / or instruction.
[0032] In some aspects, a network node may transmit a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The network node may configure the candidate beam monitoring RS resource set with one or more RS types that may be used to generate one or more beam management measurement metrics that provide more beam management information relative to other RS types, as described above. That is, each RS in the candidate beam monitoring RS resource set may be used to generate a first beam measurement metric that provides more information relative to a second beam measurement metric generated using another RS type. Alternatively, or additionally, the network node may transmit a second indication of a TCI state that indicates a QCL RS. In some aspects, the TCI state may be a unified TCI state. Based at least in part on transmitting the first indication of the candidate beam monitoring RS resource set and the second indication of the TCI state, the network node may receive a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on an RS included in the candidate beam monitoring RS resource set. To illustrate, the network node may receive the UE-initiated, event-driven beam report without explicitly indicating an instruction that specifies which RS to use for generating the UE-initiated, event-driven beam report.
[0033] 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 using a candidate beam monitoring RS resource set, the described techniques can be used to enable a UE to implicitly select an RS from the candidate beam management RS resource set that provides more beam quality information (e.g., increased spatial diversity, more granularity, a frequency band to provide comprehensive beam management measurement metrics, and / or increased accuracy due to less impact from interference) relative to beam quality information provided by other RS types (e.g., a TRS) . Alternatively, or additionally, the candidate beam management RS resource set may be configured only with RS types that may be used to generate beam measurement metrics that provide more beam quality information, such as a channel state information (CSI) reference signal (CSI-RS) and / or a synchronization signal block (SSB) . More comprehensive beam management measurement metrics and / or more accurate beam management measurement metrics may be used by a network node to configure communication beams that result in decreased data recovery errors, reduced data transfer latencies, and / or increased data throughput at the UE and / or in a wireless network. Enabling implicit selection of an RS by a UE through the use of a candidate beam monitoring RS resource set may also reduce signaling overhead and / or reduce a reporting latency, also resulting in reduced data transfer latencies and / or increased data throughput at the UE and / or in the wireless network.
[0034] 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) .
[0035] 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.
[0036] 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.
[0037] 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.
[0038] 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-aor 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.
[0039] 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) .
[0040] 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.
[0041] 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.
[0042] 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.
[0043] 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.
[0044] 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) .
[0045] 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) .
[0046] 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, a reference signal (RS) , 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, RSs 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.
[0047] 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.
[0048] 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.
[0049] 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.
[0050] 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.
[0051] 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.
[0052] 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.
[0053] 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) .
[0054] 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.
[0055] 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.
[0056] 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 time-division duplexing (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.
[0057] 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) .
[0058] In some aspects, a UE (e.g., a UE 120) may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may receive a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting; receive a second indication of a TCI state that indicates a QCL RS; select a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS; and transmit a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.
[0059] In some aspects, a network node (e.g., a network node 110) may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may transmit a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting; transmit a second indication of a TCI state that indicates a QCL RS; and receive a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
[0060] As indicated above, Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
[0061] 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.
[0062] 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.
[0063] 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.
[0064] 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.
[0065] 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 RSs (for example, a cell-specific reference signal (CRS) , a demodulation reference signal (DMRS) , or a CSI-RS and / or synchronization signals (for example, a primary synchronization signal (PSS) or a secondary synchronization signals (SSS) ) .
[0066] 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.
[0067] A downlink signal may include a DCI communication, a MAC control element (MAC-CE) communication, an RRC communication, a downlink (RS) , 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.
[0068] 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.
[0069] 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.
[0070] 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.
[0071] 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.
[0072] 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.
[0073] 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.
[0074] 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.
[0075] The transmit processor 264 may generate reference symbols for one or more RSs, such as an uplink DMRS, an uplink sounding reference signal (SRS) , and / or another type of RS. 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.
[0076] 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) .
[0077] 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.
[0078] 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.
[0079] 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.
[0080] 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.
[0081] 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.
[0082] 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.
[0083] 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.
[0084] 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.
[0085] 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.
[0086] 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.
[0087] 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) .
[0088] 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 an implicit beam monitoring RS for UE-initiated, event-driven beam reporting, 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 700 of Fig. 7, process 800 of Fig. 8, 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 700 of Fig. 7, process 800 of Fig. 8, 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.
[0089] In some aspects, a UE (e.g., a UE 120) includes means for receiving, by the UE, a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting; means for receiving, by the UE, a second indication of a TCI state that indicates a QCL RS; means for selecting, by the UE, a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS; and / or means for transmitting, by the UE, a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS. 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.
[0090] In some aspects, a network node (e.g., a network node 110) includes means for transmitting, by the network node, a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting; means for transmitting, by the network node, a second indication of a TCI state that indicates a QCL RS; and / or means for receiving, by the network node, a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set. 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.
[0091] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
[0092] Fig. 4 is a diagram illustrating an example 400 of using beams for communications between a network node and a UE, in accordance with the present disclosure. As shown in Fig. 4, a network node 110 and a UE 120 may communicate with one another.
[0093] The network node 110 may transmit to UEs 120 located within a coverage area of the network node 110. The network node 110 and the UE 120 may be configured for beamformed communications, where the network node 110 may transmit in the direction of the UE 120 using a directional NN transmit beam (e.g., a base station transmit beam) , and the UE 120 may receive the transmission using a directional UE receive beam. Each NN transmit beam may have an associated beam ID, beam direction, or beam symbols, among other examples. The network node 110 may transmit downlink communications via one or more NN transmit beams 405.
[0094] The UE 120 may attempt to receive downlink transmissions via one or more UE receive beams 410, which may be configured using different beamforming parameters at receive circuitry of the UE 120. The UE 120 may identify a particular NN transmit beam 405, shown as NN transmit beam 405-A, and a particular UE receive beam 410, shown as UE receive beam 410-A, that provide relatively favorable performance (for example, that have a best channel quality of the different measured combinations of NN transmit beams 405 and UE receive beams 410) . In some examples, the UE 120 may transmit an indication of which NN transmit beam 405 is identified by the UE 120 as a preferred NN transmit beam, which the network node 110 may select for transmissions to the UE 120. The UE 120 may thus attain and maintain a beam pair link (BPL) with the network node 110 for downlink communications (for example, a combination of the NN transmit beam 405-A and the UE receive beam 410- A) , which may be further refined and maintained in accordance with one or more established beam refinement procedures.
[0095] A downlink beam, such as an NN transmit beam 405 or a UE receive beam 410, may be associated with a transmission configuration indication (TCI) state. A TCI state may indicate a directionality or a characteristic of the downlink beam, such as one or more QCL properties of the downlink beam. A QCL property may include, for example, a Doppler shift, a Doppler spread, an average delay, a delay spread, or spatial receive parameters, among other examples. In some examples, each NN transmit beam 405 may be associated with a synchronization signal block (SSB) , and the UE 120 may indicate a preferred NN transmit beam 405 by transmitting uplink transmissions in resources of the SSB that are associated with the preferred NN transmit beam 405. A particular SSB may have an associated TCI state (for example, for an antenna port or for beamforming) . The network node 110 may, in some examples, indicate a downlink NN transmit beam 405 based at least in part on antenna port QCL properties that may be indicated by the TCI state. A TCI state may be associated with one downlink RS set (for example, an SSB and an aperiodic, periodic, or semi-persistent CSI-RS) for different QCL types (for example, QCL types for different combinations of Doppler shift, Doppler spread, average delay, delay spread, or spatial receive parameters, among other examples) . In cases where the QCL type indicates spatial receive parameters, the QCL type may correspond to analog receive beamforming parameters of a UE receive beam 410 at the UE 120. Thus, the UE 120 may select a corresponding UE receive beam 410 from a set of BPLs based at least in part on the network node 110 indicating an NN transmit beam 405 via a TCI indication.
[0096] The network node 110 may maintain a set of activated TCI states for downlink shared channel transmissions and a set of activated TCI states for downlink control channel transmissions. The set of activated TCI states for downlink shared channel transmissions may correspond to beams that the network node 110 uses for downlink transmission on a physical downlink shared channel (PDSCH) . The set of activated TCI states for downlink control channel communications may correspond to beams that the network node 110 may use for downlink transmission on a physical downlink control channel (PDCCH) or in a control resource set (CORESET) . The UE 120 may also maintain a set of activated TCI states for receiving the downlink shared channel transmissions and the CORESET transmissions. If a TCI state is activated for the UE 120, then the UE 120 may have one or more antenna configurations based at least in part on the TCI state, and the UE 120 may not need to reconfigure antennas or antenna weighting configurations. In some examples, the set of activated TCI states (for example, activated PDSCH TCI states and activated CORESET TCI states) for the UE 120 may be configured by a configuration message, such as a radio resource control (RRC) message.
[0097] Similarly, for uplink communications, the UE 120 may transmit in the direction of the network node 110 using a directional UE transmit beam, and the network node 110 may receive the transmission using a directional NN receive beam. Each UE transmit beam may have an associated beam ID, beam direction, or beam symbols, among other examples. The UE 120 may transmit uplink communications via one or more UE transmit beams 415.
[0098] The network node 110 may receive uplink transmissions via one or more NN receive beams 420 (e.g., base station receive beams) . The network node 110 may identify a particular UE transmit beam 415, shown as UE transmit beam 415-A, and a particular NN receive beam 420, shown as NN receive beam 420-A, that provide relatively favorable performance (for example, that have a best channel quality of the different measured combinations of UE transmit beams 415 and NN receive beams 420) . In some examples, the network node 110 may transmit an indication of which UE transmit beam 415 is identified by the network node 110 as a preferred UE transmit beam, which the network node 110 may select for transmissions from the UE 120. The UE 120 and the network node 110 may thus attain and maintain a BPL for uplink communications (for example, a combination of the UE transmit beam 415-A and the NN receive beam 420-A) , which may be further refined and maintained in accordance with one or more established beam refinement procedures. An uplink beam, such as a UE transmit beam 415 or an NN receive beam 420, may be associated with a spatial relation. A spatial relation may indicate a directionality or a characteristic of the uplink beam, similar to one or more QCL properties, as described above.
[0099] A TCI state may indicate different QCL types that indicate a relationship and / or association between RSs and / or physical channels, such as one or more properties that are common to the RSs and / or the physical channels. As an example, a first QCL type, also referred to as typeA, may indicate that the RSs and / or the physical channels have spatial co-location (e.g., use a common beam) . Alternatively, or additionally, having spatial co-location may indicate that the RSs and / or the physical channels have a common Doppler shift, a common Doppler spread, a common average delay, and a common delay spread. A second QCL type, also referred to as typeB, may indicate that the RSs and / or the physical channels have temporal co-location (e.g., have a common timing reference) . RSs and / or physical channels that have temporal co-location may have a common Doppler shift and a common Doppler spread. A third QCL type, also referred to as typeC, may indicate that the RSs and / or the physical channels have frequency co-location (e.g., have a common timing reference) . RSs and / or physical channels that have frequency co-location may have a common Doppler shift and a common average delay. A fourth QCL type, also referred to as type D, may indicate that the RSs and / or the physical channels have Doppler shift co-location (e.g. have the same Doppler shift properties) . RSs and / or physical channels that have Doppler shift co-location may have common spatial receive parameters (e.g., spatial filtering, beamforming, and / or an antenna array configuration) . That is, the RSs and / or physical channels may be received and / or processed in a uniform manner.
[0100] “Unified TCI” (also referred to as a “shared unified TCI” ) refers to a TCI that indicates a TCI state (e.g., a “unified TCI state” or a “share unified TCI state) that is applicable to multiple channels. For example, a unified TCI state may be applicable to at least UE-dedicated PDCCH and PDSCH and / or PUSCH and UE-dedicated PUCCH. In the unified TCI framework, for communications between the network node 110 and the UE 120, unified TCI state indications may be used to indicate a joint downlink and uplink TCI state or to indicate separate downlink and uplink TCI states. The unified TCI state indication of a joint uplink and downlink TCI state may be used to indicate a beam direction for downlink channels (e.g., PDSCH and PDCCH) or RSs (e.g., CSI-RSs) and for uplink channels (e.g., PUSCH and PUCCH) or RSs signals (e.g., sounding reference signals (SRSs) ) . The unified TCI state indication of a separate downlink TCI state may be used to indicate a beam direction for multiple downlink channels (e.g., PDSCH and PDCCH) or RSs (e.g., CSI-RSs) . The unified TCI state indication of a separate uplink TCI state may be used to indicate a beam direction to be used for multiple uplink channels (e.g., PUSCH and PUCCH) or RSs (e.g., SRSs) . In some examples, the unified TCI state indication may be “sticky, ” such that the indicated beam direction will be used for the channels and / or RSs to which the TCI state indication applies until a further indication is received. In this way, the unified TCI state indication may be applicable to multiple communications (e.g., downlink and / or uplink communications) on multiple channels.
[0101] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with respect to Fig. 4.
[0102] Fig. 5 is a diagram illustrating examples 500, 510, and 520 of CSI-RS beam management procedures, in accordance with the present disclosure. As shown in Fig. 5, examples 500, 510, and 520 include a UE 120 in communication with a network node 110 in a wireless network (e.g., wireless network 100) . However, the devices shown in Fig. 5 are provided as examples, and the wireless network may support communication and beam management between other devices (e.g., between a UE 120 and a network node 110 or transmit receive point (TRP) , between a mobile termination node and a control node, between an integrated access and backhaul (IAB) child node and an IAB parent node, and / or between a scheduled node and a scheduling node) . In some aspects, the UE 120 and the network node 110 may be in a connected state (e.g., an RRC connected state) .
[0103] As shown in Fig. 5, example 500 may include a network node 110 (e.g., one or more network node devices such as an RU, a DU, and / or a CU, among other examples) and a UE 120 communicating to perform beam management using CSI-RSs. Example 500 depicts a first beam management procedure (e.g., P1 CSI-RS beam management) . The first beam management procedure may be referred to as a beam selection procedure, an initial beam acquisition procedure, a beam sweeping procedure, a cell search procedure, and / or a beam search procedure. As shown in Fig. 5 and example 500, CSI-RSs may be configured to be transmitted from the network node 110 to the UE 120. The CSI-RSs may be configured to be periodic (e.g., using RRC signaling) , semi-persistent (e.g., using media access control (MAC) control element (MAC-CE) signaling) , and / or aperiodic (e.g., using DCI) .
[0104] The first beam management procedure may include the network node 110 performing beam sweeping over multiple transmit (Tx) beams. The network node 110 may transmit a CSI-RS using each transmit beam for beam management. To enable the UE 120 to perform receive (Rx) beam sweeping, the network node may use a transmit beam to transmit (e.g., with repetitions) each CSI-RS at multiple times within the same RS resource set so that the UE 120 can sweep through receive beams in multiple transmission instances. For example, if the network node 110 has a set of N transmit beams and the UE 120 has a set of M receive beams, the CSI-RS may be transmitted on each of the N transmit beams M times so that the UE 120 may receive M instances of the CSI-RS per transmit beam. In other words, for each transmit beam of the network node 110, the UE 120 may perform beam sweeping through the receive beams of the UE 120. As a result, the first beam management procedure may enable the UE 120 to measure a CSI-RS on different transmit beams using different receive beams to support selection of network node 110 transmit beams / UE 120 receive beam (s) beam pair (s) . The UE 120 may report the measurements to the network node 110 to enable the network node 110 to select one or more beam pair (s) for communication between the network node 110 and the UE 120. While example 500 has been described in connection with CSI-RSs, the first beam management process may also use SSBs for beam management in a similar manner as described above.
[0105] As shown in Fig. 5, example 510 may include a network node 110 and a UE 120 communicating to perform beam management using CSI-RSs. Example 510 depicts a second beam management procedure (e.g., P2 CSI-RS beam management) . The second beam management procedure may be referred to as a beam refinement procedure, a network node beam refinement procedure, a TRP beam refinement procedure, and / or a transmit beam refinement procedure. As shown in Fig. 5 and example 510, CSI-RSs may be configured to be transmitted from the network node 110 to the UE 120. The CSI-RSs may be configured to be aperiodic (e.g., using DCI) . The second beam management procedure may include the network node 110 performing beam sweeping over one or more transmit beams. The one or more transmit beams may be a subset of all transmit beams associated with the network node 110 (e.g., determined based at least in part on measurements reported by the UE 120 in connection with the first beam management procedure) . The network node 110 may transmit a CSI-RS using each transmit beam of the one or more transmit beams for beam management. The UE 120 may measure each CSI-RS using a single (e.g., a same) receive beam (e.g., determined based at least in part on measurements performed in connection with the first beam management procedure) . The second beam management procedure may enable the network node 110 to select a best transmit beam based at least in part on measurements of the CSI-RSs (e.g., measured by the UE 120 using the single receive beam) reported by the UE 120.
[0106] As shown in Fig. 5, example 520 depicts a third beam management procedure (e.g., P3 CSI-RS beam management) . The third beam management procedure may be referred to as a beam refinement procedure, a UE beam refinement procedure, and / or a receive beam refinement procedure. As shown in Fig. 5 and example 520, one or more CSI-RSs may be configured to be transmitted from the network node 110 to the UE 120. The CSI-RSs may be configured to be aperiodic (e.g., using DCI) . The third beam management process may include the network node 110 transmitting the one or more CSI-RSs using a single transmit beam (e.g., determined based at least in part on measurements reported by the UE 120 in connection with the first beam management procedure and / or the second beam management procedure) . To enable the UE 120 to perform receive beam sweeping, the network node may use a transmit beam to transmit (e.g., with repetitions) CSI-RS at multiple times within the same RS resource set so that UE 120 can sweep through one or more receive beams in multiple transmission instances. The one or more receive beams may be a subset of all receive beams associated with the UE 120 (e.g., determined based at least in part on measurements performed in connection with the first beam management procedure and / or the second beam management procedure) . The third beam management procedure may enable the network node 110 and / or the UE 120 to select a best receive beam based at least in part on reported measurements received from the UE 120 (e.g., of the CSI-RS of the transmit beam using the one or more receive beams) .
[0107] In some examples, such as examples in which the UE 120 is configured to provide semi-persistent and / or periodic beam management reports (e.g., CSI reports) for numerous beams, providing the various beam management reports may resulting in high signaling overhead and / or colliding reports. For example, multiple beam management reports may be scheduled for transmission in uplink resources in which at least one OFDM symbol overlaps. Additionally, or alternatively, for aperiodic beam management reporting, a network node 110 may separately request each beam management report, resulting in the network node and / or the UE 120 consuming significant signaling resources. On the other hand, if less frequent beam reporting is configured at the UE 120, the network node 110 may not receive timely beam management reports and / or beam measurements, resulting in the network node 110 using outdated beam measurements to configure a wireless network, such as by using the outdated beam measurements to select one or more beams used for communications that may result in network performance degradation (e.g., increased recovery errors, increased data transfer latencies, and / or decreased data throughput) .
[0108] Accordingly, a UE 120 may be configured to transmit one or more beam management reports (e.g., CSI reports) based at least in part on identifying that a condition has been satisfied and / or that a certain event has occurred. To illustrate, a UE 120 may be configured to perform UE-initiated, event-driven beam reporting. That is, the UE 120 may be configured to detect the occurrence of a trigger event associated with an event-driven beam management report (also referred to as a “beam-reporting trigger condition” ) , such as by monitoring RSs (e.g., CSI-RSs, among other examples) to assess whether a beam-reporting trigger condition has been met. Based at least in part on detecting that a beam-reporting condition has been met, the UE 120 may generate and transmit an event-driven beam management report (for example, using a MAC-CE communication and / or a UCI communication, among other examples) , such as an event-driven CSI report. In some examples, a beam-reporting trigger condition may be associated with a quality of a current (serving) beam (for example, determined using one or more of an RSRP measurement, an RSSI measurement, an RSRQ measurement, a signal-to-noise ratio (SNR) measurement, a signal-to-interference-plus-noise ratio (SINR) measurement, and / or a similar measurement) becoming worse than a certain threshold and / or failing to satisfy the certain threshold. In other examples, a beam-reporting trigger condition may be associated with a quality of at least one new (non-serving) beam becoming a threshold value better than the quality of the current (serving) beam. Alternatively, or additionally, a beam-reporting trigger condition may be associated with a quality of a new (non-serving) beam becoming better than a certain threshold and / or may be associated with a quality of a current (serving) beam becoming worse than a first threshold and a quality of at least one new (non-serving) beam becoming better than a second threshold.
[0109] In some examples, configuring a UE 120 to transmit one or more UE-initiated, event-driven beam reports, such as one or more event-driven CSI reports, may result in beam reporting optimization that is based at least in part on the UE 120 providing timely beam reports to a network node 110 with reduced reporting overhead. To illustrate, the UE 120 may have better and / or more timely knowledge of beam quality changes at the UE 120 than a network node, and a UE-initiated, event-driven beam reporting procedure may enable the UE 120 to transmit more timely beam reports with reduced reporting overhead relative to network-node-driven beam management reporting that may include more signaling overhead for requesting, scheduling, and / or transmitting a beam report. For example, when the UE 120 determines that one or more current beams fail to satisfy a quality threshold, the UE 120 may trigger beam reporting without waiting for a network node to configure and / or trigger frequent reporting.
[0110] UE-initiated / event-driven beam management may be optimized to reduce signaling overhead and / or reduce a reporting latency, such as through the use of unified TCI and / or an uplink signaling structure (e.g., a message structure and / or message contents) that uses a design specific and / or optimized to the nature of a UE-initiated, event-driven beam report to reduce signaling overhead and / or reduce a reporting latency. Alternatively, or additionally, the UE-initiated / event-driven beam management may be optimized to enable a UE to select a current beam that is to generate a beam management measurement metric based at least in part on selecting a beam that increases an accuracy of the beam management measurement metric and / or reduces error in the beam management measurement metric. The UE may select the current beam based at least in part on one or more schemes and / or rules specified by a communication standard, such as a first scheme that instructs the UE to select the current beam as a QCL RS indicated in a TCI state and / or a second scheme that instructs the UE to select the current beam as an SSB that is QCL with the QCL RS indicated in the TCI state.
[0111] Alternatively, or additionally, information indicated by a TCI state may be governed based at least in part on a communication standard. To illustrate, a communication standard may specify allowed and unallowed QCL types that may be indicated in the TCI state for particular configurations. As a first example, in a first scenario, a UE may be configured with a list of downlink TCI states for a particular RRC configuration (e.g., the UE may be configured via a dl-OrJointTCI-StateList information element (IE) ) . In the first scenario, for a DMRS of a PDSCH, a communication standard may specify a rule that the TCI state specifies, and / or that the UE expects the TCI state to specify, for QCL RSs, one of the following QCL types: case 1, for a typeA QCL RS that is set a CSI-RS resource in a non-zero power (NZP) CSI-RS resource set that is configured with higher layer tracking reference signal (TRS) information, the TCI state indicates, when applicable, a typeD QCL RS that is set to the same CSI-RS resource, or case 2, for a typeA QCL RS that is set to a CSI-RS resource in a NZP CSI-RS resource set that is configured with higher layer TRS information, the TCI state indicates, when applicable, a typeD QCL RS that is set to a CSI-RS resource in an NZP CSI-RS resource set that is configured with higher layer parameter repetition. To illustrate, for case 1 of the first scenario, a UE may expect a TCI state that specifies a TRS for a typeA QCL RS to also indicate the TRS for a typeD QCL RS, and, for case 2, the UE may expect the TCI state to indicate a CSI-RS for a typeD QCL RS in combination with specifying a TRS for a typeA QCL RS.
[0112] As another example, in a second scenario, a UE may be configured with a periodic CSI-RS resource in an NZP CSI-RS resource set, and the periodic CSI-RS resource may be configured with higher layer TRS information. In the second scenario, the communication standard may specify that the TCI state specify, and / or UE expect the state to specify, one of the following QCL types: case 3, for a typeC that is set to a synchronization signal / physical broadcast channel (SS / PBCH) block as the QCL RS, the TCI state indicates, when applicable, a typeD QCL RS that is set to the same SS / PBCH block, where the SS / PBCH block may have a physical cell identity (PCI) that is different from a PCI of the serving cell, or case 4, for a typeC that is set to an SS / PBCH block as the QCL RS, the TCI state indicates, when applicable, a typeD QCL RS that is set to a CSI-RS resource in the NZP CSI-RS resource set that is configured with the higher layer parameter repetition, where SS / PBCH block may have a PCI different from the PCI of the serving cell. To illustrate, for case 3 of the second scenario, a UE may expect a TCI state that specifies an SSB for a typeC QCL RS to also indicate the SSB for a typeD QCL RS, and, for case 4 of the second scenario, the UE may expect the TCI state to indicate a CSI-RS for a typeD QCL RS in combination with specifying an SSB for a typeC QCL RS.
[0113] In UE-initiated, event-driven beam reporting, a UE may implicitly determine an RS to use for monitoring a current beam’s quality. That is, the UE may select the RS to use based at least in part on one or more predefined rules and / or selection criteria instead of through explicit signaling and / or an explicit instruction. As one example, the UE may derive which RS to select based at least in part on an indicated TCI state (e.g. a unified TCI state) . However, in some cases, the RS derived from the TCI state may be inadequate for monitoring beam quality and / or for generating a beam management measurement metric. To illustrate, the UE may select a TRS based at least in part on a predefined rule and / or predefined criteria. However, beam management measurement metrics generated using the TRS may not provide enough spatial diversity and / or granularity to assess beam quality for different beams. Alternatively, or additionally, the TRS may not be transmitted often enough and / or with a wide enough frequency band to provide comprehensive beam management measurement metrics. As yet another example, a TRS may be more susceptible to interference relative to other RS types, such as a CSI-RS, leading to less accurate beam management measurement metrics relative to beam management measurement metrics generated using the other RS types. According, the implicit selection of an RS for UE-initiated, event-driven beam reporting may result in the UE selecting an RS type that leads to sub-optimal beam quality measurement metrics. The sub-optimal beam quality measurement metrics may be used to configure communication beams, resulting in increased data recovery errors, increased data transfer latencies, and / or decreased data throughput at the UE and / or in a wireless network.
[0114] Various aspects relate generally to an implicit beam monitoring RS for UE-initiated, event-driven beam reporting. Some aspects more specifically relate to a UE performing implicit selection of an RS from a candidate beam monitoring RS resource set using an association between a QCL RS and the RS in the candidate beam monitoring RS resource set. In some aspects, a UE may receive a first indication of a candidate beam monitoring RS resource set, and the candidate beam monitoring RS resource set may be designated for UE-initiated, event-driven beam reporting. For instance, the candidate beam monitoring RS resource set may be configured with one or more RS types that may be used to generate one or more beam management measurement metrics that provide more beam management information relative to other RS types, such as beam management metrics that provide increased spatial diversity and / or granularity, are transmitted often enough and / or with a wide enough frequency band to provide comprehensive beam management measurement metrics, and / or are less susceptible to interference relative to the other RS types. That is, the candidate beam monitoring RS resource set may be configured with one or more RSs that may be used to generate one or more beam management measurement metrics that are accurate to within a first threshold and / or provide a granularity of information to within a second threshold that may be unattainable using a different RS type.
[0115] The UE may also receive a second indication of a TCI state that indicates one or more QCL RSs. In some aspects, based at least in part on the UE being configured to perform UE-initiated, event-driven beam reporting, the UE may select a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting. The UE may select the current RS based at least in part on an association between the current RS and the QCL RS indicated by the TCI state and / or may transmit a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.
[0116] In some aspects, a network node may transmit a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The network node may configure the candidate beam monitoring RS resource set with one or more RS types that may be used to generate one or more beam management measurement metrics that provide more beam management information relative to other RS types, as described above. That is, each RS in the candidate beam monitoring RS resource set may be used to generate a first beam measurement metric that provides more information relative to a second beam measurement metric generated using another RS type. Alternatively, or additionally, the network node may transmit a second indication of a TCI state that indicates a QCL RS. In some aspects, the TCI state may be a unified TCI state. Based at least in part on transmitting the first indication of the candidate beam monitoring RS resource set and the second indication of the TCI state, the network node may receive a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on an RS included in the candidate beam monitoring RS resource set. To illustrate, the network node may receive the UE-initiated, event-driven beam report without explicitly indicating an instruction that specifies which RS to use for generating the UE-initiated, event-driven beam report.
[0117] 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 using a candidate beam monitoring RS resource set, the described techniques can be used to enable a UE to implicitly select an RS from the candidate beam management RS resource set that provides more beam quality information (e.g., increased spatial diversity, more granularity, a frequency band to provide comprehensive beam management measurement metrics, and / or increased accuracy due to less impact from interference) relative to beam quality information provided by other RS types (e.g., a TRS) . Alternatively, or additionally, the candidate beam management RS resource set may be configured only with RS types that may be used to generate beam measurement metrics provide more beam quality information, such as a CSI-RS and / or an SSB. More comprehensive beam management measurement metrics and / or more accurate beam management measurement metrics may be used by a network node to configure communication beams that result in decreased data recovery errors, reduced data transfer latencies, and / or increased data throughput at the UE and / or in a wireless network. Enabling implicit selection of an RS by a UE through the use of a candidate beam monitoring RS resource set may also reduce signaling overhead and / or reduce a reporting latency, also resulting in reduced data transfer latencies and / or increased data throughput at the UE and / or in the wireless network.
[0118] As indicated above, Fig. 5 is provided as an example of beam management procedures. Other examples of beam management procedures may differ from what is described with respect to Fig. 5. For example, the UE 120 and the network node 110 may perform the third beam management procedure before performing the second beam management procedure, and / or the UE 120 and the network node 110 may perform a similar beam management procedure to select a UE transmit beam.
[0119] Fig. 6 is a diagram illustrating an example 600 of a wireless communication process between a network node (e.g., the network node 110) and a UE (e.g., the UE 120) , in accordance with the present disclosure.
[0120] As shown by reference number 610, a network node 110 and a UE 120 may establish a connection. To illustrate, the UE 120 may power up in a cell coverage area provided by the network node 110, and the UE 120 and the network node 110 may perform one or more procedures (e.g., a random access channel (RACH) procedure and / or an RRC procedure) to establish a wireless connection. As another example, the UE 120 may move into the cell coverage area provided by the network node 110 and may perform a handover from a source network node (e.g., another network node 110) to the network node 110. Alternatively, or additionally, the network node 110 and the UE 120 may communicate via the connection based at least in part on any combination of Layer 1 signaling (e.g., downlink control information (DCI) and / or uplink control information (UCI) ) , Layer 2 signaling (e.g., a MAC control element (CE) ) , and / or Layer 3 signaling (e.g., RRC signaling) . To illustrate, the network node 110 may request, via RRC signaling, UE capability information and / or the UE 120 may transmit, via RRC signaling, the UE capability information. As part of communicating via the connection, the network node 110 may transmit configuration information via Layer 3 signaling (e.g., RRC signaling) , and activate and / or deactivate a particular configuration via Layer 2 signaling (e.g., a MAC CE) and / or Layer 1 signaling (e.g., DCI) . To illustrate, the network node 110 may transmit the configuration information via Layer 3 signaling at a first point in time associated with the UE being tolerant of communication delays, and the network node 110 may transmit an activation of the configuration via Layer 2 signaling and / or Layer 1 signaling at a second point in time associated with the UE being intolerant to communication delays.
[0121] As shown by reference number 620, the UE 120 may transmit, and the network node 110 may receive, an indication of a UE-initiated, event-driven beam reporting capability of the UE 120. As one example, the UE 120 may indicate support for UE-initiated, event-driven beam reporting. Alternatively, or additionally, the UE 120 may indicate support for the use of a candidate beam management RS resource set in UE-initiated, event-driven beam reporting.
[0122] For clarity, Fig. 6 illustrates the UE 120 transmitting the indication of the UE-initiated, event-driven beam reporting capability in a separate transaction than establishing a connection with the network node 110. However, in some aspects, the UE 120 may transmit the indication of the UE-initiated, event-driven beam reporting capability as part of establishing a connection with the network node 110.
[0123] As shown by reference number 630, the network node 110 may transmit, and the UE 120 may receive, UE-initiated, event-driven beam reporting configuration information. As one example, the network node 110 may transmit, as the UE-initiated, event-driven beam reporting configuration information, an indication of one or more trigger events, one or more conditions, and / or one or more thresholds that may be used by the UE 120 to trigger the generation of a UE-initiated, event-driven beam report, such as the generation and / or inclusion of beam management measurement metrics (e.g., CSI, an RSRP metric, a beam reference signal received power (B-RSRP) metric, an RSRQ metric, a beam reference signal received quality (B-RSRQ) metric, a channel quality indicator (CQI) metric, and / or an SINR metric) . In some aspects, the network node 110 may transmit at least some of the UE-initiated, event-driven beam reporting configuration information as part of establishing a connection with the UE 120.
[0124] As shown by reference number 640, the network node 110 may transmit, and the UE 120 may receive, an indication of a candidate beam management RS resource set. To illustrate, the network node 110 may indicate one or more air interface resources (e.g., a frequency partition, a time partition, and / or a spatial partition) that are allocated and / or included in the candidate beam management RS resource set, and the candidate beam management RS resource set may be allocated to and / or designated for UE-initiated, event-driven beam reporting. Alternatively, or additionally, the network node may indicate one or more RS types (e.g., a CSI-RS and / or an SSB) that are associated with the air interface resource (s) that are included in the candidate beam management RS resource set. The candidate beam management RS resource set may be configured for and / or may include a single RS type (e.g., only CSI-RSs or only SSB) or multiple RS types (e.g., at least one air interface resource is allocated to an SSB and at least one air interface resource is allocated to a CSI-RS) . For example, the candidate beam management RS resource set may include only CSI-RSs, only SSBs, or a combination of CSI-RSs and SSBs. As at least part of indicating the candidate beam management RS resource set, the network node 110 may explicitly configure each RS included in the candidate beam monitoring RS resource set, such as by using Layer 3 signaling (e.g., RRC signaling) to indicate one or more configuration parameters of each RS. Alternatively, or additionally, each RS included in the candidate beam monitoring RS resource set may be an RS type that may be used to generate one or more beam management measurement metrics (e.g., CSI, an RSRP metric, a B-RSRP metric, an RSRQ metric, a B-RSRQ metric, a CQI metric, and / or an SINR metric) that provide more beam management information relative to beam management metrics generated using other RS types, are accurate to within a first threshold, and / or provide information that has a granularity to within a second threshold, such as an SSB and / or a CSI-RS. Alternatively, or additionally, the candidate beam monitoring RS resource set may not include an RS type that is insufficient for generating a beam management measurement metric, such as a TRS.
[0125] In some aspects, each candidate beam monitoring RS in the candidate beam monitoring RS resource set may be configured with one or more common properties. That is, each candidate beam monitoring RS may have a same property. Some examples of common properties that are used and / or shared by the candidate monitoring RSs may include a periodicity, a bandwidth, or a frequency domain density. In transmitting the indication of the candidate beam management RS resource set, the network node 110 may indicate one or more properties of each candidate beam management RS, such as a common property, a carrier frequency, and / or time location. In some aspects, the network node 110 may configure the candidate beam management RS resource set based at least in part on one or more rules, such as one or more rules that are specified by a communication standard. To illustrate, a communication standard may specify that a candidate beam monitoring RS resource set uses a configuration that results in the UE being able to implicitly select a current RS unambiguously. That is, the candidate beam management RS resource set RS uses a configuration that enables the UE to derive a single RS within the candidate beam monitoring RS resource set that is a valid selection for UE-initiated, event-driven beam reporting. In another example, the communication standard may specify that the candidate beam monitoring RS resource set may include multiple candidate beam monitoring RSs that are valid for selection by a UE for use in UE-initiated, event-driven beam reporting, and / or the communication standard may specify one or more rules to govern how the UE selects an RS from the multiple valid candidate beam monitoring RSs. For instance, the communication standard may specify a rule that indicates to select the RS based at least in part on an index of the RS, such as by selecting the candidate beam monitoring RS associated with the lowest index of the multiple valid candidate beam monitoring RSs, or the candidate beam monitoring RS associated with the highest index of the multiple valid candidate beam monitoring RSs.
[0126] As shown by reference number 650, the network node 110 may transmit, and the UE 120 may receive, an indication of one or more TCI states. In some aspects, the network node 110 may indicate the TCI state (s) in multiple transmissions and / or different signaling. To illustrate, as part of establishing a connection with the UE 120, the network node 110 may transmit TCI state information in Layer 3 signaling (e.g., RRC signaling) , such as a list of TCI states, respective identifiers (IDs) for each state, and / or respective beam information for each TCI state. At a later point in time, the network node 110 may transmit, in Layer 1 signaling (e.g., DCI) , an indication of one or more particular TCI states in the list of states to use for beam-based communications. In some aspects, the TCI states may be unified TCI states as described above.
[0127] The network node 110 may indicate selection of a particular TCI state (e.g., via Layer 1 signaling) based at least in part on one or more rules specified by a communication standard. To illustrate, a communication standard may specify that, in a scenario that includes UE-initiated, event-driven beam reporting being configured and / or enabled at a UE, a QCL RS that is indicated as a typeD QCL RS may only be a CSI-RS and / or that any other different type of RS may be disallowed. Accordingly, in such a scenario, the network node 110 may indicate selection of a TCI state that indicates a CSI-RS for a typeD QCL RS and / or may not indicate selection of a TCI state that does not indicate a CSI-RS for a typeD QCL RS.
[0128] As shown by reference number 660, the UE 120 may select a current RS using the indicated TCI state, such as by selecting the current RS from the candidate beam monitoring RS resource set using a QCL RS indicated by the TCI state. In some aspects, the TCI state may not explicitly indicate the RS to select from the candidate beam monitoring RS resource set, and the UE 120 may derive which RS to select from the candidate beam monitoring RS resource set using an association between the indicated QCL RS and the RS in the candidate beam monitoring RS resource set (e.g., a typeA QCL association, a typeB QCL association, a typeC QCL association, and / or a typeD QCL association) .
[0129] In some aspects, the UE 120 may select, as the current RS, the QCL RS indicated by the TCI state (e.g., in alignment with the first scheme described above) . For example, the TCI state may indicate a typeA QCL RS that is a TRS and may also indicate a typeD QCL RS that is a CSI-RS. The network node 110 may configure the candidate beam monitoring RS resource set to include multiple CSI-RSs such that the UE 120 selects, as the current RS, a CSI-RS from the candidate beam monitoring RS resource set. Thus, the UE 120 may select the QCL RS indicated by the TCI state, and the association used to select the CSI-RS may be a TCI state typeD association. In some aspects, as described above, a communication standard may specify that, in a scenario that includes UE-initiated, event-driven beam reporting being configured and / or enabled, a QCL RS that is indicated as a typeD QCL RS may only be a CSI-RS, and / or that indicating any other different type of RS may be disallowed. Accordingly, in such a scenario, a TRS may be disallowed as a typeD QCL RS.
[0130] As another example, the UE 120 may select, as the current RS, an SSB that is QCL with the QCL RS indicated by the TCI state (e.g., in alignment with the second scheme described above) . To illustrate, the TCI state may indicate a typeA QCL RS that is a TRS and a typeD QCL RS that is the same TRS. The network node 110 may configure the candidate beam monitoring RS resource set to include multiple SSBs such that the UE 120 selects, as the current RS, an SSB from the candidate beam monitoring RS resource set that is QCL with the QCL RS indicated by the TCI state, and the association used to select the CSI-RS may be a typeD QCL association.
[0131] In some aspects, the UE 120 may select the current RS based at least in part on a third scheme that includes deriving a QCL source of the QCL RS indicated by the TCI state. To illustrate, the network node may configure the candidate beam monitoring RS resource set to include CSI-RSs (e.g., only CSI-RSs) , and the UE 120 may receive an indicate TCI state that specifies a TRS as a typeA QCL RS and a typeD QCL RS. In such a case, the UE 120 may not select the indicated QCL RS as the current RS based at least in part on a TRS not providing enough information for a beam management measurement metric as described above (e.g., not enough resolution, spatial information, and / or frequency information) . Instead, the UE 120 may derive a QCL source of the indicated QCL RS (e.g., the TRS) , and may select the current RS based at least in part on the QCL source. To illustrate, the TRS may have a QCL association (e.g., a typeC and / or a typeD association) with an SSB that is a source QCL RS to the TRS. Alternatively, or additionally, the SSB may have the same QCL association with a particular RS in the candidate beam monitoring resource set. The UE 120 may analyze information to derive the QCL source of the TRS (e.g., the SSB) using the QCL association. Alternatively, or additionally, the UE 120 may use the QCL association to identify the particular RS in the candidate beam management RS resource set. That is, the UE 120 may select, as the current beam, a CSI-RS in the candidate beam management RS resource set that has a same QCL association with the SSB as the TRS indicated in the TCI state.
[0132] In some aspects, a communication standard may specify that the candidate beam monitoring RS resource set uses a configuration that results in the current RS being an unambiguous selection for the UE 120. “Unambiguous selection” may denote a single available selection and / or only available selection. To illustrate, the communication standard may specify that the candidate beam monitoring RS resource set includes a single RS that may be selected by a UE for the UE-initiated, event-driven beam reporting. In other aspects, the communication standard may specify that the candidate beam monitoring RS resource set may include multiple candidate beam monitoring RSs that are valid for a UE to select for UE-initiated, event-driven beam reporting. For multiple valid candidate beam monitoring RSs, the communication standard may specify one or more rules and / or the UE 120 may implement one or more rules for selecting from the multiple valid candidate beam monitoring RSs. As one example, the communication standard may specify to select, as the current RS, a candidate beam monitoring RS that is associated with the lowest index in the multiple valid candidate beam monitoring RSs, or the candidate beam monitoring RS associated with the highest index in the multiple valid candidate beam monitoring RSs. Accordingly, the UE 120 may select the current RS using one or more rules specified by a communication standard and / or specified by the UE 120.
[0133] The UE 120 may monitor for the current RS as at least part of UE-initiated, event-driven beam reporting. Alternatively, or additionally, the UE 120 may generate one or more measurement metrics (e.g., CSI, an RSRP metric, a B-RSRP metric, an RSRQ metric, a B-RSRQ metric, a CQI metric, and / or an SINR metric) using the current RS. In some aspects, the UE 120 may analyze the measurement metric (s) to determine the occurrence of a trigger event and / or whether a condition has been satisfied.
[0134] As shown by reference number 670, the network node 110 may transmit, and the UE 120 may receive, one or more candidate beam management RSs indicated by the candidate beam management RS resource set. To illustrate, the network node 110 may transmit one or more CSI-RSs using one or more air interface resources in the candidate beam management RS resource set and / or one or more SSBs using one or more air interface resources in the candidate beam management RS resource set. In some aspects, the network node 110 may transmit the candidate beam management RSs repeatedly, iteratively, and / or periodically, as shown by reference number 680. Alternatively, or additionally, the network node 110 may transmit the candidate beam management RSs for a duration that is associated with the UE 120 operating with UE-initiated, event-driven beam reporting in an enabled mode. The network node 110 may cease transmitting the candidate beam management RSs outside of the duration and / or based at least in part on the UE 120 operating with UE-initiated, event-driven beam reporting in a disabled mode.
[0135] As shown by reference number 690, the UE 120 may transmit, and the network node 110 may receive, a UE-initiated, event-driven beam report. The UE-initiated, event-driven beam report may include one or more beam management metrics that are generated by the UE 120 using the current beam. To illustrate, the UE-initiated, event driven beam report may include one or more of CSI, an RSRP metric, a B-RSRP metric, an RSRQ metric, a B-RSRQ metric, a CQI metric, and / or an SINR metric. In some aspects, the UE 120 may transmit the UE-initiated, event-driven beam report based at least in part on detecting a trigger event and / or detecting an occurrence of a condition.
[0136] The use of a candidate beam monitoring RS resource set may enable a UE to implicitly select an RS that may be used to generate beam management measurement metrics that provide more information (e.g., increased spatial diversity, more granularity, a frequency band to provide comprehensive beam management measurement metrics, and / or increased accuracy due to less impact from interference) relative to beam measurement metrics generated using other RS types (e.g., a TRS) . More comprehensive beam management metrics may be used to select communication beams that result in decreased data recovery errors, reduced data transfer latencies, and / or increased data throughput at the UE and / or in a wireless network. Enabling implicit selection of an RS by a UE through the use of a candidate beam monitoring RS resource set may also reduce signaling overhead and / or reduce a reporting latency, which may also result in reduced data transfer latencies and / or increased data throughput at the UE and / or in the wireless network.
[0137] As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with regard to Fig. 6.
[0138] Fig. 7 is a diagram illustrating an example process 700 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 700 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with implicit beam monitoring RS for UE-initiated, event-driven beam reporting.
[0139] As shown in Fig. 7, in some aspects, process 700 may include receiving a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting (block 710) . For example, the UE (e.g., using reception component 902 and / or communication manager 906, depicted in Fig. 9) may receive a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting, as described above.
[0140] As further shown in Fig. 7, in some aspects, process 700 may include receiving a second indication of a TCI state that indicates a QCL RS (block 720) . For example, the UE (e.g., using reception component 902 and / or communication manager 906, depicted in Fig. 9) may receive a second indication of a TCI state that indicates a QCL RS, as described above.
[0141] As further shown in Fig. 7, in some aspects, process 700 may include selecting a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS (block 730) . For example, the UE (e.g., using communication manager 906, depicted in Fig. 9) may select a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS, as described above.
[0142] As further shown in Fig. 7, in some aspects, process 700 may include transmitting a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS (block 740) . For example, the UE (e.g., using transmission component 904 and / or communication manager 906, depicted in Fig. 9) may transmit a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS, as described above.
[0143] Process 700 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.
[0144] In a first aspect, the candidate beam monitoring RS resource set includes at least one of a channel state information RS, or a synchronization signal block.
[0145] In a second aspect, each candidate beam monitoring RS in the candidate beam monitoring RS resource set is configured with one or more common properties.
[0146] In a third aspect, the one or more common properties include at least one of a periodicity, a bandwidth, or a frequency domain density.
[0147] In a fourth aspect, selecting the current RS from the candidate beam monitoring RS resource set includes selecting, as the current RS, the QCL RS indicated by the TCI state.
[0148] In a fifth aspect, the association is a TCI state typeD association.
[0149] In a sixth aspect, selecting the current RS from the candidate beam monitoring RS resource set includes selecting, as the current RS, a synchronization signal block that is QCL with the QCL RS indicated by the TCI state.
[0150] In a seventh aspect, the association is a TCI state typeD association.
[0151] In an eighth aspect, the UE-initiated, event-driven beam reporting is configured, the QCL RS is a typeD QCL RS, and the typeD QCL RS is a CSI-RS.
[0152] In a ninth aspect, the typeD QCL RS being a different RS than the CSI-RS is disallowed.
[0153] In a tenth aspect, selecting the current RS from the candidate beam monitoring RS resource set includes deriving a QCL source of the QCL RS, and selecting the current RS based at least in part on the QCL source.
[0154] In an eleventh aspect, the candidate beam monitoring RS resource set uses a configuration that results in the current RS being an unambiguous selection for the UE-initiated, event-driven beam reporting.
[0155] In a twelfth aspect, the candidate beam monitoring RS resource set includes multiple candidate beam monitoring RSs that are valid as a selection for the UE-initiated, event-driven beam reporting, and selecting the current RS from the candidate beam monitoring RS resource set includes selecting the current RS from the candidate beam monitoring RS resource set based at least in part on a rule.
[0156] In a thirteenth aspect, the rule indicates to select the current RS based at least in part on an index.
[0157] Although Fig. 7 shows example blocks of process 700, in some aspects, process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.
[0158] Fig. 8 is a diagram illustrating an example process 800 performed, for example, at a network node or an apparatus of a network node, in accordance with the present disclosure. Example process 800 is an example where the apparatus or the network node (e.g., network node 110) performs operations associated with implicit beam monitoring RS for UE-initiated, event-driven beam reporting.
[0159] As shown in Fig. 8, in some aspects, process 800 may include transmitting a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting (block 810) . For example, the network node (e.g., using transmission component 1004 and / or communication manager 1006, depicted in Fig. 10) may transmit a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting, as described above.
[0160] As further shown in Fig. 8, in some aspects, process 800 may include transmitting a second indication of a TCI state that indicates a QCL RS (block 820) .
[0161] For example, the network node (e.g., using transmission component 1004 and / or communication manager 1006, depicted in Fig. 10) may transmit a second indication of a TCI state that indicates a QCL RS, as described above.
[0162] As further shown in Fig. 8, in some aspects, process 800 may include receiving a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set (block 830) . For example, the network node (e.g., using reception component 1002 and / or communication manager 1006, depicted in Fig. 10) may receive a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set, as described above.
[0163] Process 800 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.
[0164] In a first aspect, the candidate beam monitoring RS resource set includes at least one of a channel state information RS, or a synchronization signal block.
[0165] In a second aspect, each candidate beam monitoring RS in the candidate beam monitoring RS resource set is configured with one or more common properties.
[0166] In a third aspect, the one or more common properties include at least one of a periodicity, a bandwidth, or a frequency domain density.
[0167] In a fourth aspect, the current RS from the candidate beam monitoring RS resource set is the QCL RS indicated by the TCI state.
[0168] In a fifth aspect, the current RS from the candidate beam monitoring RS resource set is a synchronization signal block that is QCL with the QCL RS indicated by the TCI state.
[0169] In a sixth aspect, the UE-initiated, event-driven beam reporting is configured, the QCL RS is a typeD QCL RS, and the typeD QCL RS is a CSI-RS.
[0170] In a seventh aspect, the typeD QCL RS being a different RS than the CSI-RS is disallowed.
[0171] In an eighth aspect, the candidate beam monitoring RS resource set uses a configuration that results in the current RS being an unambiguous selection for the UE-initiated, event-driven beam reporting.
[0172] In a ninth aspect, the candidate beam monitoring RS resource set includes multiple candidate beam monitoring RSs that are valid as a selection for the UE-initiated, event-driven beam reporting.
[0173] Although Fig. 8 shows example blocks of process 800, in some aspects, process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 8. Additionally, or alternatively, two or more of the blocks of process 800 may be performed in parallel.
[0174] Fig. 9 is a diagram of an example apparatus 900 for wireless communication, in accordance with the present disclosure. The apparatus 900 may be a UE, or a UE may include the apparatus 900. In some aspects, the apparatus 900 includes a reception component 902, a transmission component 904, and / or a communication manager 906, 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 906 is the communication manager 140 described in connection with Fig. 1. As shown, the apparatus 900 may communicate with another apparatus 908, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 902 and the transmission component 904.
[0175] In some aspects, the apparatus 900 may be configured to perform one or more operations described herein in connection with Figs. 5-6. Additionally, or alternatively, the apparatus 900 may be configured to perform one or more processes described herein, such as process 700 of Fig. 7, or a combination thereof. In some aspects, the apparatus 900 and / or one or more components shown in Fig. 9 may include one or more components of the UE described in connection with Fig. 1 and Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 9 may be implemented within one or more components described in connection with Fig. 1 and 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.
[0176] The reception component 902 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 908. The reception component 902 may provide received communications to one or more other components of the apparatus 900. In some aspects, the reception component 902 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 900. In some aspects, the reception component 902 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. 1 and Fig. 2.
[0177] The transmission component 904 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 908. In some aspects, one or more other components of the apparatus 900 may generate communications and may provide the generated communications to the transmission component 904 for transmission to the apparatus 908. In some aspects, the transmission component 904 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 908. In some aspects, the transmission component 904 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. 1 and Fig. 2. In some aspects, the transmission component 904 may be co-located with the reception component 902 in one or more transceivers.
[0178] The communication manager 906 may support operations of the reception component 902 and / or the transmission component 904. For example, the communication manager 906 may receive information associated with configuring reception of communications by the reception component 902 and / or transmission of communications by the transmission component 904. Additionally, or alternatively, the communication manager 906 may generate and / or provide control information to the reception component 902 and / or the transmission component 904 to control reception and / or transmission of communications.
[0179] The reception component 902 may receive a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The reception component 902 may receive a second indication of a TCI state that indicates a QCL RS. The communication manager 906 may select a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS. The transmission component 904 may transmit a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.
[0180] The number and arrangement of components shown in Fig. 9 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. 9. Furthermore, two or more components shown in Fig. 9 may be implemented within a single component, or a single component shown in Fig. 9 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 9 may perform one or more functions described as being performed by another set of components shown in Fig. 9.
[0181] Fig. 10 is a diagram of an example apparatus 1000 for wireless communication, in accordance with the present disclosure. The apparatus 1000 may be a network node, or a network node may include the apparatus 1000. In some aspects, the apparatus 1000 includes a reception component 1002, a transmission component 1004, and / or a communication manager 1006, 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 1006 is the communication manager 150 described in connection with Fig. 1. As shown, the apparatus 1000 may communicate with another apparatus 1008, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 1002 and the transmission component 1004.
[0182] In some aspects, the apparatus 1000 may be configured to perform one or more operations described herein in connection with Figs. 5-6. Additionally, or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as process 800 of Fig. 8, or a combination thereof. In some aspects, the apparatus 1000 and / or one or more components shown in Fig. 10 may include one or more components of the network node described in connection with Fig. 1 and Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 10 may be implemented within one or more components described in connection with Fig. 1 and 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.
[0183] The reception component 1002 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1008. The reception component 1002 may provide received communications to one or more other components of the apparatus 1000. In some aspects, the reception component 1002 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 1000. In some aspects, the reception component 1002 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. 1 and Fig. 2. In some aspects, the reception component 1002 and / or the transmission component 1004 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 1000 via one or more communications links, such as a backhaul link, a midhaul link, and / or a fronthaul link.
[0184] The transmission component 1004 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1008. In some aspects, one or more other components of the apparatus 1000 may generate communications and may provide the generated communications to the transmission component 1004 for transmission to the apparatus 1008. In some aspects, the transmission component 1004 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 1008. In some aspects, the transmission component 1004 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. 1 and Fig. 2. In some aspects, the transmission component 1004 may be co-located with the reception component 1002 in one or more transceivers.
[0185] The communication manager 1006 may support operations of the reception component 1002 and / or the transmission component 1004. For example, the communication manager 1006 may receive information associated with configuring reception of communications by the reception component 1002 and / or transmission of communications by the transmission component 1004. Additionally, or alternatively, the communication manager 1006 may generate and / or provide control information to the reception component 1002 and / or the transmission component 1004 to control reception and / or transmission of communications.
[0186] The transmission component 1004 may transmit a first indication of a candidate beam monitoring RS resource set designated for UE-initiated, event-driven beam reporting. The transmission component 1004 may transmit a second indication of a TCI state that indicates a QCL RS. The reception component 1002 may receive a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set.
[0187] The number and arrangement of components shown in Fig. 10 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. 10. Furthermore, two or more components shown in Fig. 10 may be implemented within a single component, or a single component shown in Fig. 10 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 10 may perform one or more functions described as being performed by another set of components shown in Fig. 10.
[0188] The following provides an overview of some Aspects of the present disclosure:
[0189] Aspect 1: A method of wireless communication performed by a user equipment (UE) , comprising: receiving, by the UE, a first indication of a candidate beam monitoring reference signal (RS) resource set designated for UE-initiated, event-driven beam reporting; receiving, by the UE, a second indication of a transmission configuration indicator (TCI) state that indicates a quasi-co-located (QCL) RS; selecting, by the UE, a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS; and transmitting, by the UE, a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.
[0190] Aspect 2: The method of Aspect 1, wherein the candidate beam monitoring RS resource set includes at least one of: a channel state information RS, or a synchronization signal block.
[0191] Aspect 3: The method of any of Aspects 1-2, wherein each candidate beam monitoring RS in the candidate beam monitoring RS resource set is configured with one or more common properties.
[0192] Aspect 4: The method of Aspect 3, wherein the one or more common properties comprise at least one of: a periodicity, a bandwidth, or a frequency domain density.
[0193] Aspect 5: The method of any of Aspects 1-4, wherein selecting the current RS from the candidate beam monitoring RS resource set comprises: selecting, as the current RS, the QCL RS indicated by the TCI state.
[0194] Aspect 6: The method of Aspect 5, wherein the association is a TCI state typeD association.
[0195] Aspect 7: The method of any of Aspects 1-6, wherein selecting the current RS from the candidate beam monitoring RS resource set comprises: selecting, as the current RS, a synchronization signal block that is QCL with the QCL RS indicated by the TCI state.
[0196] Aspect 8: The method of Aspect 7, wherein the association is a TCI state typeD association.
[0197] Aspect 9: The method of any of Aspects 1-8, wherein the UE-initiated, event-driven beam reporting is configured, wherein the QCL RS is a typeD QCL RS, and wherein the typeD QCL RS is a channel state information reference signal (CSI-RS) .
[0198] Aspect 10: The method of Aspect 9, wherein the typeD QCL RS being a different RS than the CSI-RS is disallowed.
[0199] Aspect 11: The method of any of Aspects 1-10, wherein selecting the current RS from the candidate beam monitoring RS resource set comprises: deriving a QCL source of the QCL RS; and selecting the current RS based at least in part on the QCL source.
[0200] Aspect 12: The method of any of Aspects 1-11, wherein the candidate beam monitoring RS resource set uses a configuration that results in the current RS being an unambiguous selection for the UE-initiated, event-driven beam reporting.
[0201] Aspect 13: The method of any of Aspects 1-12, wherein the candidate beam monitoring RS resource set includes multiple candidate beam monitoring RSs that are valid as a selection for the UE-initiated, event-driven beam reporting, and wherein selecting the current RS from the candidate beam monitoring RS resource set comprises: selecting the current RS from the candidate beam monitoring RS resource set based at least in part on a rule.
[0202] Aspect 14: The method of Aspect 13, wherein the rule indicates to select the current RS based at least in part on an index.
[0203] Aspect 15: A method of wireless communication performed by a network node, comprising: transmitting, by the network node, a first indication of a candidate beam monitoring reference signal (RS) resource set designated for user equipment (UE) -initiated, event-driven beam reporting; transmitting, by the network node, a second indication of a transmission configuration indicator (TCI) state that indicates a quasi-co-located (QCL) RS; and receiving, by the network node, a UE-initiated, event- driven beam report that indicates a beam quality measurement metric that is based at least in part on a current RS included in the candidate beam monitoring RS resource set.
[0204] Aspect 16: The method of Aspect 15, wherein the candidate beam monitoring RS resource set includes at least one of: a channel state information RS, or a synchronization signal block.
[0205] Aspect 17: The method of any of Aspects 15-16, wherein each candidate beam monitoring RS in the candidate beam monitoring RS resource set is configured with one or more common properties.
[0206] Aspect 18: The method of Aspect 17, wherein the one or more common properties comprise at least one of: a periodicity, a bandwidth, or a frequency domain density.
[0207] Aspect 19: The method of any of Aspects 15-18, wherein the current RS from the candidate beam monitoring RS resource set is the QCL RS indicated by the TCI state.
[0208] Aspect 20: The method of any of Aspects 15-19, wherein the current RS from the candidate beam monitoring RS resource set is a synchronization signal block that is QCL with the QCL RS indicated by the TCI state.
[0209] Aspect 21: The method of any of Aspects 15-20, wherein the UE-initiated, event-driven beam reporting is configured, wherein the QCL RS is a typeD QCL RS, and wherein the typeD QCL RS is a channel state information reference signal (CSI-RS) .
[0210] Aspect 22: The method of Aspect 21, wherein the typeD QCL RS being a different RS than the CSI-RS is disallowed.
[0211] Aspect 23: The method of any of Aspects 15-22, wherein the candidate beam monitoring RS resource set uses a configuration that results in the current RS being an unambiguous selection for the UE-initiated, event-driven beam reporting.
[0212] Aspect 24: The method of any of Aspects 15-23, wherein the candidate beam monitoring RS resource set includes multiple candidate beam monitoring RSs that are valid as a selection for the UE-initiated, event-driven beam reporting.
[0213] Aspect 25: 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 1-14.
[0214] Aspect 26: 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 1-14.
[0215] Aspect 27: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-14.
[0216] Aspect 28: 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 1-14.
[0217] Aspect 29: 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 1-14.
[0218] Aspect 30: 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 1-14.
[0219] Aspect 31: 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 1-14.
[0220] Aspect 32: 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 15-24.
[0221] Aspect 33: 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 15-24.
[0222] Aspect 34: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 15-24.
[0223] Aspect 35: 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 15-24.
[0224] Aspect 36: 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 15-24.
[0225] Aspect 37: 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 15-24.
[0226] Aspect 38: 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 15-24.
[0227] 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.
[0228] 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.
[0229] 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.
[0230] 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) .
[0231] 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. ”
[0232] 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
1.An apparatus for wireless communication at a user equipment (UE) , comprising:one or more memories; andone or more processors, the one or more processors individually or collectively and based at least in part on information stored in the one or more memories, configured to:receive a first indication of a candidate beam monitoring reference signal (RS) resource set designated for UE-initiated, event-driven beam reporting;receive a second indication of a transmission configuration indicator (TCI) state that indicates a quasi-co-located (QCL) RS;select a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS; andtransmit a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.2.The apparatus of claim 1, wherein the candidate beam monitoring RS resource set includes at least one of:a channel state information RS, ora synchronization signal block.3.The apparatus of claim 1, wherein each candidate beam monitoring RS in the candidate beam monitoring RS resource set is configured with one or more common properties.4.The apparatus of claim 1, wherein the one or more processors, to select the current RS from the candidate beam monitoring RS resource set, are configured to:select, as the current RS, the QCL RS indicated by the TCI state.5.The apparatus of claim 1, wherein the one or more processors, to select the current RS from the candidate beam monitoring RS resource set, are configured to:select, as the current RS, a synchronization signal block that is QCL with the QCL RS indicated by the TCI state.6.The apparatus of claim 1, wherein the UE-initiated, event-driven beam reporting is configured,wherein the QCL RS is a typeD QCL RS, andwherein the typeD QCL RS is a channel state information reference signal (CSI-RS) .7.The apparatus of claim 1, wherein the one or more processors, to select the current RS from the candidate beam monitoring RS resource set, are configured to:derive a QCL source of the QCL RS; andselect the current RS based at least in part on the QCL source.8.The apparatus of claim 1, wherein the candidate beam monitoring RS resource set uses a configuration that results in the current RS being an unambiguous selection for the UE-initiated, event-driven beam reporting.9.The apparatus of claim 1, wherein the candidate beam monitoring RS resource set includes multiple candidate beam monitoring RSs that are valid as a selection for the UE-initiated, event-driven beam reporting, andwherein the one or more processors, to select the current RS from the candidate beam monitoring RS resource set, are configured to:select the current RS from the candidate beam monitoring RS resource set based at least in part on a rule.10.A method of wireless communication performed by a user equipment (UE) , comprising:receiving, by the UE, a first indication of a candidate beam monitoring reference signal (RS) resource set designated for UE-initiated, event-driven beam reporting;receiving, by the UE, a second indication of a transmission configuration indicator (TCI) state that indicates a quasi-co-located (QCL) RS;selecting, by the UE, a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS; andtransmitting, by the UE, a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.11.The method of claim 10, wherein the candidate beam monitoring RS resource set includes at least one of:a channel state information RS, ora synchronization signal block.12.The method of claim 10, wherein each candidate beam monitoring RS in the candidate beam monitoring RS resource set is configured with one or more common properties.13.The method of claim 10, wherein selecting the current RS from the candidate beam monitoring RS resource set comprises:selecting, as the current RS, the QCL RS indicated by the TCI state.14.The method of claim 10, wherein selecting the current RS from the candidate beam monitoring RS resource set comprises:selecting, as the current RS, a synchronization signal block that is QCL with the QCL RS indicated by the TCI state.15.The method of claim 10, wherein the UE-initiated, event-driven beam reporting is configured,wherein the QCL RS is a typeD QCL RS, andwherein the typeD QCL RS is a channel state information reference signal (CSI-RS) .16.The method of claim 10, wherein selecting the current RS from the candidate beam monitoring RS resource set comprises:deriving a QCL source of the QCL RS; andselecting the current RS based at least in part on the QCL source.17.The method of claim 10, wherein the candidate beam monitoring RS resource set uses a configuration that results in the current RS being an unambiguous selection for the UE-initiated, event-driven beam reporting.18.The method of claim 10, wherein the candidate beam monitoring RS resource set includes multiple candidate beam monitoring RSs that are valid as a selection for the UE-initiated, event-driven beam reporting, andwherein selecting the current RS from the candidate beam monitoring RS resource set comprises:selecting the current RS from the candidate beam monitoring RS resource set based at least in part on a rule.19.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 user equipment (UE) , cause the UE to:receive a first indication of a candidate beam monitoring reference signal (RS) resource set designated for UE-initiated, event-driven beam reporting;receive a second indication of a transmission configuration indicator (TCI) state that indicates a quasi-co-located (QCL) RS;select a current RS from the candidate beam monitoring RS resource set to use for the UE-initiated, event-driven beam reporting, the selecting being based at least in part on an association between the current RS and the QCL RS; andtransmit a UE-initiated, event-driven beam report that indicates a beam quality measurement metric that is based at least in part on the current RS.20.The non-transitory computer-readable medium of claim 19, wherein the one or more instructions, that cause the UE to select the current RS from the candidate beam monitoring RS resource set, cause the UE to:derive a QCL source of the QCL RS; andselect the current RS based at least in part on the QCL source.
Citation Information
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