Channel state information acquisition and reporting for layer 1 or layer 2 triggered mobility
By configuring CSI reporting for LTM candidate cells through L1/L2 messages, early CSI measurements are supported, reducing handover latency and improving communication reliability and efficiency in wireless communication systems.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- QUALCOMM INC
- Filing Date
- 2024-12-23
- Publication Date
- 2026-07-02
Smart Images

Figure CN2024141408_02072026_PF_FP_ABST
Abstract
Description
CHANNEL STATE INFORMATION ACQUISITION AND REPORTING FOR LAYER 1 OR LAYER 2 TRIGGERED MOBILITYFIELD OF THE DISCLOSURE
[0001] Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods associated with channel state information acquisition and reporting for Layer 1 or Layer 2 triggered mobility.BACKGROUND
[0002] Wireless communication systems are widely deployed to provide various services, which may involve carrying or supporting voice, text, other messaging, video, data, and / or other traffic. Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication among multiple wireless communication devices including user devices or other devices by sharing the available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, and / or device transmit power, among other examples) . Such multiple-access RATs are supported by technological advancements that have been adopted in various telecommunication standards, which define common protocols that enable different wireless communication devices to communicate on a local, municipal, national, regional, or global level.
[0003] 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 RATs beyond NR) may be designed to better support enhanced mobile broadband (eMBB) access, Internet of things (IoT) networks or reduced capability device deployments, and ultra-reliable low latency communication (URLLC) applications. To support these verticals, NR systems may be designed to implement a modularized functional infrastructure, a disaggregated and service-based network architecture, network function virtualization, network slicing, multi-access edge computing, millimeter wave (mmWave) technologies including massive multiple-input multiple-output (MIMO) , licensed and unlicensed spectrum access, non-terrestrial network (NTN) deployments, sidelink and other device-to-device direct communication technologies (for example, cellular vehicle-to-everything (CV2X) communication) , multiple-subscriber implementations, high-precision positioning, and / or radio frequency (RF) sensing, among other examples. As the demand for connectivity continues to increase, further improvements in NR may be implemented, and other RATs, such as 6G and beyond, may be introduced to enable new applications and facilitate new use cases.
[0004] In some aspects, a user equipment (UE) may be configured to perform a cell switch via dynamic control signaling at lower layers (e.g., downlink control information (DCI) for L1 signaling or a medium access control (MAC) control element (MAC-CE) for L2 signaling) to reduce latency, reduce overhead, and / or otherwise increase efficiency of the cell switch. In some L1 / L2 inter-cell mobility scenarios, a source cell transmits a cell update command to a UE to indicate a target cell that the UE is to switch to, and the source cell transmits a separate configuration update to indicate one or more new communication parameters for the target cell (e.g., a new beam indication, power control command, and / or timing advance) .SUMMARY
[0005] Some aspects described herein relate to a user equipment (UE) for wireless communication. The UE may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to receive, from a network node, a Layer 1 or Layer 2 (L1 / L2) triggered mobility (LTM) configuration associated with a candidate cell, wherein the LTM configuration indicates a channel state information (CSI) reporting configuration for the candidate cell. The one or more processors may be configured to receive, from the network node, an L1 / L2 message associated with initiating communication with the candidate cell. The one or more processors may be configured to transmit at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message.
[0006] Some aspects described herein relate to a method of wireless communication performed by a UE. The method may include receiving, from a network node, an LTM configuration associated with a candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the candidate cell. The method may include receiving, from the network node, an L1 / L2 message associated with initiating communication with the candidate cell. The method may include transmitting at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message.
[0007] 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, from a network node, an LTM configuration associated with a candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the candidate cell. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive, from the network node, an L1 / L2 message associated with initiating communication with the candidate cell. The set of instructions, when executed by one or more processors of the UE, may cause the UE to transmit at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message.
[0008] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving, from a network node, an LTM configuration associated with a candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the candidate cell. The apparatus may include means for receiving, from the network node, an L1 / L2 message associated with initiating communication with the candidate cell. The apparatus may include means for transmitting at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message.
[0009] Some aspects described herein relate to a network node. The network node may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to transmit, to a UE, an LTM configuration associated with a candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the candidate cell. The one or more processors may be configured to transmit, to the UE, an L1 / L2 message associated with initiating communication with the candidate cell.
[0010] Some aspects described herein relate to a method of wireless communication performed by a network node. The method may include transmitting, to a UE, an LTM configuration associated with a candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the candidate cell. The method may include transmitting, to the UE, an L1 / L2 message associated with initiating communication with the candidate cell.
[0011] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions 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, to a UE, an LTM configuration associated with a candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the candidate cell. The set of instructions, when executed by one or more processors of the network node, may cause the network node to transmit, to the UE, an L1 / L2 message associated with initiating communication with the candidate cell.
[0012] Some aspects described herein relate to an apparatus. The apparatus may include means for transmitting, to a UE, an LTM configuration associated with a candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the candidate cell. The apparatus may include means for transmitting, to the UE, an L1 / L2 message associated with initiating communication with the candidate cell.
[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, this 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 disaggregated network node architecture, in accordance with the present disclosure.
[0018] Fig. 3 is a diagram illustrating examples of channel state information (CSI) reference signal (CSI-RS) beam management procedures, in accordance with the present disclosure.
[0019] Fig. 4 is a diagram illustrating an example of a Layer 1 and / or Layer 2 (L1 / L2) trigger mobility (LTM) procedure, in accordance with the present disclosure.
[0020] Fig. 5 is a diagram illustrating an example associated with CSI acquisition and reporting for LTM, in accordance with the present disclosure.
[0021] Fig. 6 is a diagram illustrating examples associated with CSI acquisition and reporting for LTM, in accordance with the present disclosure.
[0022] Fig. 7 is a diagram illustrating an example process performed, for example, at a user equipment (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. The present disclosure 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 wireless communication 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] In some wireless communication systems, a network node may provide communications coverage for a user equipment (UE) using one or more cells. For example, the UE may be configured with one or more cell groups that may include a primary cell group having a primary cell (PCell) and / or a secondary cell group having a primary secondary cell (PScell) . In some examples, a cell group may additionally include one or more secondary cells (SCells) , which may improve coverage associated with the cell group. Additionally, or alternatively, the UE may be configured with a special cell (SpCell) , which may be a PCell or a PSCell, and / or one or more SCells.
[0029] In some examples, a UE may support Layer 1 or Layer 2 (L1 / L2) triggered mobility, also known as lower-layer triggered mobility (LTM) , where a cell for the UE may be updated via dynamic control signaling at lower layers (e.g., downlink control information (DCI) for L1 signaling or a medium access control (MAC) control element (MAC-CE) for L2 signaling) to reduce latency, reduce overhead, and / or otherwise increase efficiency of performing a cell switch (e.g., relative to a Layer 3 handover) . Accordingly, an L1 / L2 message may be used to signal a cell switch to a UE from a source cell to a target cell. In some cases, the network node may provide an LTM configuration for one or more LTM candidate cells in advance, which may allow the UE to apply a corresponding configuration after receiving the L1 / L2 message signaling the cell switch.
[0030] In some examples, a UE may perform one or more channel state information (CSI) measurements associated with a cell, and the UE may report the measurements to the cell or a network node to improve communication with a cell. In some cases, however, the LTM configuration may not include CSI configuration information that may support early measurement reporting (e.g., CSI measurements reported before or relatively quickly after an LTM cell switch procedure) for LTM candidate cells. Consequently, the UE may experience decreased communication performance or reliability associated with the target cell and may increase handover latency, as early CSI measurements associated with the target cell may not be reported to allow for timely adjustments of communication parameters by the target cell after the cell switch.
[0031] Various aspects relate generally to performing early CSI measurements and reporting for LTM candidate cells. Some aspects more specifically relate to a network node transmitting an LTM configuration that indicates a CSI reporting configuration for one or more LTM candidate cells. For example, the CSI configuration may configure periodic CSI reporting, semi-persistent CSI reporting, and / or aperiodic CSI reporting for the one or more LTM candidate cells. In some aspects, the LTM configuration may configure the UE to initiate CSI reporting based on receiving an L1 / L2 message triggering a cell switch (e.g., a cell switch command, such as via a MAC-CE) . For example, the L1 / L2 message may include an indication of whether CSI reporting is requested for an LTM candidate cell. Additionally, or alternatively, the UE may receive DCI including a CSI request field associated with a CSI reporting configuration in the LTM candidate cell. In some aspects, the UE may receive an L1 / L2 message (e.g., a MAC-CE) activating a transmission configuration indicator (TCI) state for the LTM candidate cell, and the message may indicate one or more CSI reports requested after the cell switch. Accordingly, the UE may perform CSI reporting in accordance with the LTM configuration and the received L1 / L2 message.
[0032] 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, the described techniques can be used to support CSI measurements for one or more LTM candidate cells to support an LTM procedure. Accordingly, the described techniques may allow the UE to report CSI measurements for one or more LTM candidate cells and a target cell before and / or relatively soon after a cell switch procedure, thereby reducing handover latency and improving communication reliability with the target cell. In some aspects, the CSI reporting before or soon after the cell switch procedure may further allow the target cell to adjust communication parameters relatively quickly, which may improve communication reliability relatively quickly after an LTM handover procedure. Additionally, the described techniques may support periodic, semi-persistent, and aperiodic CSI reporting, thereby improving the scheduling flexibility for the UE and a cell in performing CSI reporting.
[0033] As described above, wireless communication systems may be deployed to provide various services, which may involve carrying or supporting voice, text, other messaging, video, data, and / or other traffic. Some wireless communications systems may employ multiple-access radio access technologies (RATs) . The multiple-access RATs may be capable of supporting communication with multiple wireless communication devices by sharing the 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.
[0034] Multiple-access RATs are supported by technological advancements that have been adopted in various telecommunication standards, which define common protocols that enable wireless communication devices to communicate on a local, 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 may support enhanced mobile broadband (eMBB) access, Internet of Things (IoT) networks or reduced capability (RedCap) device deployments, ultra-reliable low-latency communication (URLLC) applications, and / or massive machine-type communication (mMTC) , among other examples.
[0035] To support these and other target verticals, a wireless communication system may be designed to implement a modularized functional infrastructure, a disaggregated and service-based network architecture, network function virtualization, network slicing, multi-access edge computing, millimeter wave (mmWave) technologies including massive multiple-input multiple-output (MIMO) , beamforming, IoT device or RedCap device connectivity and management, industrial connectivity, licensed and unlicensed spectrum access, sidelink and other device-to-device direct communication (for example, cellular vehicle-to-everything (CV2X) communication) , frequency spectrum expansion, overlapping spectrum use, small cell deployments, non-terrestrial network (NTN) deployments, device aggregation, advanced duplex communication (for example, sub-band full-duplex (SBFD) ) , multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, network energy savings (NES) , low-power signaling and radios, and / or artificial intelligence or machine learning (AI / ML) , among other examples.
[0036] The foregoing and other technological improvements may support use cases, such as wireless fronthauls, wireless midhauls, 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.
[0037] As the demand for connectivity continues to increase, further improvements in NR may be implemented, and other RATs, such as 6G and beyond, may be introduced to enable new applications and facilitate new use cases. The methods, operations, apparatuses, and techniques described herein may enable one or more of the foregoing technologies or new technologies and / or support one or more of the foregoing use cases or new use cases.
[0038] 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. For example, in Fig. 1, the wireless communication network 100 includes a network node (NN) 110a and a network node 110b. The network nodes 110 may support communications with multiple UEs 120. For example, in Fig. 1, the network nodes 110 support communication with a UE 120a, a UE 120b, and a UE 120c. In some examples, a UE 120 may also communicate with other UEs 120 and a network node 110 may communicate with a core network and with other network nodes 110.
[0039] 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 bands or ranges. 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 other RATs. Additionally or alternatively, in some examples, the wireless communication network 100 may implement dynamic spectrum sharing (DSS) , in which multiple RATs are implemented with dynamic bandwidth allocation (for example, based on user demand) in a single frequency band. In some examples, the wireless communication network 100 may support communication over unlicensed spectrum, where access to an unlicensed channel is subject to a channel access mechanism. For example, in a shared or unlicensed frequency band, a transmitting device may perform a channel access procedure, such as a listen-before-talk (LBT) procedure, to contend against other devices for channel access before transmitting on a shared or unlicensed channel.
[0040] 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 the 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 mid-band frequencies or to frequencies that are within FR2, FR4, FR4-a or FR4-1, FR5, and / or the EHF band. Higher frequency bands may extend 5G NR operation, 6G operation, and / or other RATs beyond 52.6 GHz.
[0041] A network node 110 and / or a UE 120 may include one or more devices, components, or systems that enable communication with other devices, components, or systems of the wireless communication network 100. For example, a UE 120 and a network node 110 may each include one or more chips, system-on-chips (SoCs) , chipsets, packages, or devices that individually or collectively constitute or comprise a processing system, such as a processing system 140 of the UE 120 or a processing system 145 of the network node 110. A processing system (for example, the processing system 140 and / or the processing system 145) 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) (also referred to as neural network processors or deep learning processors (DLPs) ) , and / or digital signal processors (DSPs) ) , processing blocks, application-specific integrated circuits (ASICs) , programmable logic devices (PLDs) , or other discrete gate or transistor logic or circuitry (any one or more of which may be generally referred to herein individually as a “processor” or collectively as “the processor” or “the processor circuitry” ) . Such 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. In some other examples, each of a group of processors may be configurable or configured to perform a same set of functions.
[0042] The processing system 140 and the processing system 145 may each include memory circuitry in the form of one or multiple memory devices, memory blocks, memory elements, or other discrete gate or transistor logic or circuitry, each of which may include or implement tangible storage media such as random-access memory (RAM) or read-only memory (ROM) , or combinations thereof (any one or more of which may be generally referred to herein individually as a “memory” 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 or instructions (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 configured to perform various functions or operations described herein without requiring configuration by software. “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.
[0043] The processing system 140 and the processing system 145 may each include or be coupled with one or more modems (such as a cellular (for example, a 5G or 6G compliant) modem) . In some examples, one or more processors of the processing system 140 and / or the processing system 145 include or implement one or more of the modems. The processing system 140 and the processing system 145 may also 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 examples, one or more processors of the processing system 140 and / or the processing system 145 include or implement one or more of the radios, RF chains, or transceivers. 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 the processing system 140 of the UE 120 or by the processing system 145 of the network node 110) .
[0044] A network node 110 and a UE 120 may each include one or multiple antennas or antenna arrays. Typical network nodes 110 and UEs 120 may include multiple antennas, which may be organized or structured into 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. As used herein, the term “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. The term “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 associated with the group of antennas. The term “antenna module” may refer to circuitry including one or more antennas as well as one or more other components (such as filters, amplifiers, or processors) associated with integrating the antenna module into a wireless communication device such as the network node 110 and the UE 120.
[0045] 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, a gNB, an access point (AP) , a transmission reception point (TRP) , 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) . In various deployments, 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 a 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 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 operates with a full radio protocol stack to enable or facilitate communication between a UE 120 and a core network of the wireless communication network 100.
[0046] Alternatively, and as also shown, a network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station) , having a disaggregated architecture, meaning that the network node 110 may operate with 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. An example disaggregated network node architecture is described in more detail below with reference to Fig. 2. 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 network functionality into multiple units or modules that can be individually deployed.
[0047] 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 one or more radio units (RUs) . A CU may host one or more higher layers, such as a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer, among other examples. A DU may host one or more of a radio link control (RLC) layer, a 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 a lower PHY layer that is configured to perform functions, such as a fast Fourier transform (FFT) , an inverse FFT (IFFT) , beamforming, and / or physical random access channel (PRACH) extraction and filtering, among other examples. An RU may perform 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 split (LLS) . In such an architecture, each RU can be operated to handle over the air (OTA) communication with one or more UEs 120. In some examples, a single network node 110 may include a combination of one or more CUs, one or more DUs, and / or one or more RUs. 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, which may be implemented as a virtual network function, such as in a cloud deployment.
[0048] Some network nodes 110 (for example, a base station, an RU, or a TRP) may provide communication coverage for a particular geographic area. 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 more cells (for example, each cell may support communication within an angular (for example, 60 degree) range around the network node) . 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 associated service subscriptions. A pico cell may cover a relatively small geographic area and may also allow unrestricted access by UEs 120 with associated 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) ) . 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, an unmanned aerial vehicle, or an NTN network node) .
[0049] 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. Various different types of network nodes 110 may generally transmit at different power levels, serve different coverage areas (for example, a cell 130a and a cell 130b) , and / or have different impacts on interference in the wireless communication network 100 than other types of network nodes 110.
[0050] The UEs 120 may be physically dispersed throughout the coverage area of the wireless communication network 100, and each UE 120 may be stationary or mobile. A UE 120 may be, may include, or may also be referred to as an access 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 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, or smart jewelry) , a gaming device, an entertainment device (for example, a music device, a video device, 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] 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 that of the UEs 120 of the first category and that of the UEs 120 of the second capability) . A UE 120 of the third category may be referred to as a reduced capability 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, 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, or smart city deployments, among other examples.
[0052] 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 and uplink resources may include time domain resources (for example, frames, subframes, slots, and symbols) , frequency domain resources (for example, frequency bands, component carriers (CCs) , subcarriers, resource blocks, and resource elements) , and spatial domain resources (for example, particular transmit directions or beams) .
[0053] Frequency domain resources may be subdivided into bandwidth parts (BWPs) . A BWP may be a block of frequency domain resources (for example, a continuous set of resource blocks (RBs) within a full component carrier bandwidth) that may be configured at a UE-specific level. A UE 120 may be configured with both an uplink BWP and a downlink BWP (which may be the same or different) . Each BWP may be associated with its own numerology (indicating a sub-carrier spacing (SCS) and cyclic prefix (CP) ) . A BWP may be dynamically configured or activated (for example, by a network node 110 transmitting a DCI configuration to the one or more UEs 120) and / or reconfigured (for example, in real-time or near-real-time) according to changing network conditions in the wireless communication network 100 and / or specific requirements of one or more UEs 120. An active BWP defines the operating bandwidth of the UE 120 within the operating bandwidth of the serving cell. The use of BWPs 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 and reduce UE power consumption by enabling the UE to monitor fewer frequency domain resources) , leaving more frequency domain resources to be spread across multiple UEs 120. Thus, BWPs may also assist in the implementation of lower-capability (for example, RedCap) UEs 120 by facilitating the configuration of smaller bandwidths for communication by such UEs 120 and / or by facilitating reduced UE power consumption.
[0054] As used herein, a downlink signal may be or include a reference signal, control information, or data. For example, downlink reference signals include a primary synchronization signal (PSS) , a secondary SS (SSS) , an SS block (SSB) (for example, that includes a PSS, an SSS, and a physical broadcast channel (PBCH) ) , a demodulation reference signal (DMRS) , a phase tracking reference signal (PTRS) , a tracking reference signal (TRS) , and a CSI reference signal (CSI-RS) , among other examples. A downlink signal carrying control information or data may be transmitted via a downlink channel. Downlink channels may include one or more control channels for transmitting control information and one or more data channels for transmitting data. Downlink reference signals may be transmitted in addition to, or multiplexed with, downlink control channel communications and / or downlink data channel communications. A downlink control channel may be specifically used to transmit DCI from a network node 110 to a UE 120. DCI generally contains the information the UE 120 needs to identify RBs in a subsequent subframe and how to decode them, including a modulation and coding scheme (MCS) or redundancy version parameters. Different DCI formats carry different information, such as scheduling information in the form of downlink or uplink grants, slot format indicators (SFIs) , preemption indicators (PIs) , transmit power control (TPC) commands, hybrid automatic repeat request (HARQ) information, new data indicators (NDIs) , among other examples. 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 physical downlink control channels (PDCCHs) , and downlink data channels may include physical downlink shared channels (PDSCHs) . Control information or data communications may be transmitted on a PDCCH and PDSCH, respectively. For example, a PDCCH can carry DCI, while a PDSCH can carry a MAC-CE, an RRC message, or user data, among other examples. Each PDSCH may carry one or more transport blocks (TBs) of data.
[0055] As used herein, an uplink signal may include a reference signal, control information, or data. For example, uplink reference signals include a sounding reference signal (SRS) , a PTRS, and a DMRS, among other examples. An uplink signal carrying control information or data may be transmitted via an uplink channel. An uplink channel may include one or more control channels for transmitting control information and one or more data channels for transmitting data. Uplink reference signals may be transmitted in addition to, or multiplexed with, uplink control channel communications and / or uplink data channel communications. An uplink control channel may be specifically used to transmit uplink control information (UCI) 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 physical uplink control channels (PUCCHs) , and uplink data channels may include physical uplink shared channels (PUSCHs) . Control information or data communications may be transmitted on a PUCCH and PUSCH, respectively. For example, a PUCCH can carry UCI, while a PUSCH can carry a MAC-CE, an RRC message, or user data, among other examples. UCI can include a scheduling request (SR) , HARQ feedback information (for example, a HARQ acknowledgement (ACK) indication or a HARQ negative acknowledgement (NACK) indication) , uplink power control information (for example, an uplink TPC parameter) , and / or CSI, among other examples. CSI can include a channel quality indicator (CQI) (indicative of downlink channel conditions to facilitate selection of transmission parameters, such as an MCS, by a network node 110) , a precoding matrix indicator (PMI) , a CSI-RS resource indicator (CRI) (for example, indicative of a beam used to transmit a CSI-RS) , an SS / PBCH resource block indicator (SSBRI) (for example, indicative of a beam used to transmit an SSB) , a layer indicator (LI) , a rank indicator (RI) , and / or measurement information (for example, an L1-reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, among other examples) which can be used for beam management, among other examples. Each PUSCH may carry one or more TBs of data.
[0056] The information (for example, data, control information, or reference signal information) transmitted by a network node 110 to a UE 120, or vice versa, may be represented as a sequence of binary bits that are mapped (for example, modulated) to an analog signal waveform (for example, a discrete Fourier transform (DFT) -spread-orthogonal frequency division multiplexing (OFDM) (DFT-s-OFDM) waveform or a CP-OFDM waveform) that is transmitted by the network node 110 or UE 120 over a wireless communication channel. In some examples, the network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively) may select an MCS (for example, an order of quadrature amplitude modulation (QAM) , such as 64-QAM, 128-QAM, or 256-QAM, among other examples) for a downlink signal or an uplink signal. For example, the network node 110 may select an MCS for a downlink signal in accordance with UCI received from the UE 120. The network node 110 may transmit, to the UE 120, an indication of the selected MCS for the downlink signal, such as via DCI that schedules the downlink signal. As another example, the network node 110 may transmit, and the UE 120 may receive, an indication of an MCS to be applied for the one or more uplink signals, such as via DCI scheduling transmission of the one or more uplink signals.
[0057] The network node 110 or the UE 120 (such as by using the processing system 145 or the processing system 140, respectively, and / or one or more coupled modems) may perform signal processing on the information (such as filtering, amplification, modulation, digital-to-analog conversion, an IFFT operation, multiplexing, interleaving, mapping, and / or encoding, among other examples) to generate a processed signal in accordance with the selected MCS. In some examples, the network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively, and / or one or more coupled encoders or modems) may perform a channel coding operation or a forward error correction (FEC) operation to control errors in transmitted information. For example, the network node 110 or the UE 120 may perform an encoding operation to generate encoded information (such as by selectively introducing redundancy into the information, typically using an error correction code (ECC) , such as a polar code or a low-density parity-check (LDPC) code) . The network node 110 or the UE 120 (for example, using the processing system 145 and / or one or more modems) may further perform spatial processing (for example, precoding) on the encoded information to generate one or more processed or precoded signals for downlink or uplink transmission, respectively. In some examples, the network node 110 or the UE 120 may perform codebook-based precoding or non-codebook-based precoding. Codebook-based precoding may involve selecting a precoder (for example, a precoding matrix) using a codebook. For example, the network node 110 may provide precoding information indicating which precoder, defined by the codebook, is to be used by the UE 120. Non-codebook-based precoding may involve selecting or deriving a precoder based on, or otherwise associated with, one or more downlink or uplink signal measurements. The network node 110 or the UE 120 may transmit the processed downlink or uplink signals, respectively, via one or more antennas.
[0058] The network node 110 or the UE 120 may receive uplink signals or downlink signals, respectively, via one or more antennas. The network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively, and / or one or more coupled modems) may perform signal processing (for example, in accordance with the MCS) on the received uplink or downlink signals, respectively (such as filtering, amplification, demodulation, analog-to-digital conversion, an FFT operation, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, and / or decoding, among other examples) , to map the received signal (s) to a sequence of binary bits (for example, received information) that estimates the information transmitted by the network node 110 or the UE 120 via the downlink or uplink signals. The network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively, and / or a coupled decoder or one or more modems) may decode the received information (such as by using an ECC, a decoding operation, and / or an FEC operation) to detect errors and / or correct bit errors in the received information to generate decoded information. The decoded information may estimate the information transmitted via the downlink or uplink signals.
[0059] In some examples, a UE 120 and a network node 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. A network node 110 and / or UE 120 may communicate using massive MIMO, multi-user MIMO, or single-user MIMO, which may involve rapid switching between beams or cells. For example, 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 a phase shift, a phase offset, and / or an amplitude) to generate one or more beams, which is referred to as beamforming. For example, the network node 110b may generate one or more beams 160a, and the UE 120b may generate one or more beams 160b. The term “beam” may refer to a directional transmission of a wireless signal toward a receiving device or otherwise in a desired direction, a directional reception of a wireless signal from a transmitting device or otherwise in a desired direction, a direction associated with a directional transmission or directional reception, a set of directional resources associated with a signal transmission or signal reception (for example, an angle of arrival, a horizontal direction, and / or a vertical direction) , 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, among other examples.
[0060] MIMO may be implemented using various spatial processing or spatial multiplexing operations. In some examples, MIMO may include a massive MIMO technique which may be associated with an increased (for example, “massive” ) quantity of antennas at the network node 110 and / or at the UE 120, such as in a network implementing mmWave technology. Massive MIMO may improve communication reliability by enabling a network node 110 and / or a UE 120 to communicate the same data across different propagation (or spatial) paths. In some examples, MIMO may support simultaneous transmission to multiple receivers, referred to as multi-user MIMO (MU-MIMO) . Some RATs may employ MIMO techniques, such as multi-TRP (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) .
[0061] To support MIMO techniques, the network node 110 and the UE 120 may perform one or more beam management operations, such as an initial beam acquisition operation, one or more beam refinement operations, and / or a beam recovery operation. For example, an initial beam acquisition operation may involve the network node 110 transmitting signals (for example, SSBs, CSI-RSs, or other signals) via respective beams (for example, of the beams 160a of the network node 110) and the UE 120 receiving and measuring the signal (s) via respective beams of multiple beams (for example, from the beams 160b of the UE 120) to identify a best beam (or beam pair) for communication between the UE 120 and the network node 110. For example, the UE 120 may transmit an indication (for example, in a message associated with a random access channel (RACH) operation) of a (best) identified beam of the network node 110 (for example, by indicating an SSBRI or other identifier associated with the beam) . A beam refinement operation may involve a first device (for example, the UE 120 or the network node 110) transmitting signal (s) via a subset of beams (for example, identified based on, or otherwise associated with, measurements reported as part of one or more other beam management operations) . A second device (for example, the network node 110 or the UE 120) may receive the signal (s) via a single beam (for example, to identify the best beam for communication from the subset of beams) . The beam (s) may be identified via one or more spatial parameters, such as a TCI state and / or a quasi co-location (QCL) parameter, among other examples. The network node 110 and the UE 120 may increase reliability and / or achieve efficiencies in throughput, signal strength, and / or other signal properties for massive MIMO operations by performing the beam management operations.
[0062] Some aspects and techniques as described herein may be implemented, at least in part, using an artificial intelligence (AI) program (for example, referred to herein as an “AI / ML model” ) , such as a program that includes a machine learning (ML) model and / or an artificial neural network (ANN) model. The AI / ML model may be deployed at one or more devices 165 (for example, one or more network nodes 110, one or more UEs 120, and / or one or more servers, and / or one or more components of a cloud computing network, among other examples) . For example, in an deployment where AI / ML functionality is performed independently at a device 165, sometimes referred to as “overlay AI / ML” , the AI / ML model (or an instance or portion of the AI / ML model) may be deployed at a UE 120 (for example, at the processing system 140) , a network node 110 (for example, at the processing system 145) , one or more servers, and / or one or more components of a cloud computing network, among other examples. Additionally or alternatively, in a deployment where AI / ML functionality is coordinated between different devices 165, sometimes referred to as “coordinated AI / ML” , or performed at all device and network layers, sometimes referred to as “native AI / ML” , the AI / ML model (or an instance of the AI / ML model) may be deployed at multiple devices 165 (for example, a first portion of the AI / ML model may be deployed at a UE 120 and a second portion of the AI / ML model may be deployed at a network node 110) . In other examples of coordinated AI / ML and / or native AI / ML, a first AI / ML model may be deployed at a UE 120 and a second AI / ML model may be deployed at a network node 110. The AI / ML model (s) may be configured to enhance various aspects of the wireless communication network 100 (for example, to increase privacy, reliability, and / or efficient use of network bandwidth, and / or to reduce latency, among other examples) . For example, the AI / ML model (s) may be trained to identify patterns or relationships in data corresponding to the wireless communication network 100, a device, and / or an air interface, among other examples. The AI / ML model (s) may support operational decisions relating to one or more aspects associated with wireless communications devices, networks, or services.
[0063] Accordingly, in some examples, the AI / ML model (s) may enable AI-as-a-Service (for example, an end-to-end AI / ML service via a user plane) for use cases such as a self-organizing network (SON) , minimization of drive test (MDT) , quality of experience (QoE) , positioning, sensing, predictive mobility, and / or traffic prediction, among other examples. In some examples, AI-as-a-Service use cases may include measurement collection reporting by a UE 120, device selection criteria (for example, according to a geographical area where measurements are to be collected and / or UE capabilities to be used to collected measurements) , and / or reporting configurations (for example, reporting parameters such as location, time, and / or sensor information, among other examples) . Additionally or alternatively, the AI / ML model (s) may enable AI / ML procedures (for example, RAN-triggered service establishment, configuration, inferencing using UE-side and / or network-side models, performance monitoring and / or management, and / or capability signaling, among other examples) . Additionally or alternatively, the AI / ML model (s) may enable RAN-based AI / ML services via one or more application program interfaces (APIs) and / or management interfaces for use cases such as beam management, radio resource monitoring (RRM) relaxation, mobility prediction, load prediction, network energy savings, and / or coverage and capacity improvements, among other examples.
[0064] One enhancement for multi-beam operation at higher carrier frequencies is facilitation of efficient (for example, low latency and low overhead) downlink and / or uplink beam management operations to support L1 / L2-centric inter-cell mobility. L1 / L2 signaling may be referred to as “lower-layer” signaling. L1 / L2 signaling may be used to activate and / or deactivate LTM candidate cells in a set of cells configured for lower LTM and / or to provide reference signals for measurement by the UE 120, by which the UE 120 may select a candidate beam as a target beam for a lower-layer handover operation. Accordingly, L1 / L2-centric inter-cell mobility may enable a UE 120 to perform a cell switch via dynamic control signaling at lower layers (for example, DCI for L1 signaling or a MAC-CE for L2 signaling) , rather than semi-static Layer 3 (L3) RRC signaling. Thus, L1 / L2 centric inter-cell mobility may reduce latency, reduce overhead, and / or otherwise increase efficiency of the cell switch.
[0065] In some aspects, the UE 120 may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may receive, from a network node, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell; receive, from the network node, an L1 / L2 message associated with initiating communication with the LTM candidate cell; and transmit at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
[0066] In some aspects, the network node 110 may include a communication manager 155. As described in more detail elsewhere herein, the communication manager 155 may transmit, to a UE, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell; and transmit, to the UE, an L1 / L2 message associated with initiating communication with the LTM candidate cell. Additionally, or alternatively, the communication manager 155 may perform one or more other operations described herein.
[0067] Fig. 2 is a diagram illustrating an example disaggregated network node architecture 200, in accordance with the present disclosure. One or more components of the example disaggregated network node architecture 200 may be, may include, or may be included in one or more network nodes (such one or more network nodes 110) . The disaggregated network node architecture 200 may include a CU 210 that can communicate directly with a core network 220 via a backhaul link, or that can communicate indirectly with the core network 220 via one or more disaggregated control units, such as a non-real-time (Non-RT) RAN intelligent controller (RIC) 250 associated with a Service Management and Orchestration (SMO) Framework 260 and / or a near-real-time (Near-RT) RIC 270 (for example, via an E2 link) . The CU 210 may communicate with one or more DUs 230 via respective midhaul links, such as via F1 interfaces. Each of the DUs 230 may communicate with one or more RUs 240 via respective fronthaul links. Each of the RUs 240 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 240.
[0068] Each of the components of the disaggregated network node architecture 200, including the CUs 210, the DUs 230, the RUs 240, the Near-RT RICs 270, the Non-RT RICs 250, and the SMO Framework 260, 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.
[0069] In some aspects, the CU 210 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 210 may be deployed to communicate with one or more DUs 230, as necessary, for network control and signaling. Each DU 230 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 240. For example, a DU 230 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 230, or for communicating signals with the control functions hosted by the CU 210. Each RU 240 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) 240 may be controlled by the corresponding DU 230.
[0070] The SMO Framework 260 may support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 260 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 260 may interact with a cloud computing platform (such as an open cloud (O-Cloud) platform 290) 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 210, a DU 230, an RU 240, a non-RT RIC 250, and / or a Near-RT RIC 270. In some aspects, the SMO Framework 260 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) 280, via an O1 interface. Additionally or alternatively, the SMO Framework 260 may communicate directly with each of one or more RUs 240 via a respective O1 interface. In some deployments, this configuration can enable each DU 230 and the CU 210 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
[0071] The Non-RT RIC 250 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 270. The Non-RT RIC 250 may be coupled to or may communicate with (such as via an A1 interface) the Near-RT RIC 270. The Near-RT RIC 270 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 210, one or more DUs 230, and / or an O-eNB 280 with the Near-RT RIC 270.
[0072] In some aspects, to generate AI / ML models to be deployed in the Near-RT RIC 270, the Non-RT RIC 250 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 270 and may be received at the SMO Framework 260 or the Non-RT RIC 250 from non-network data sources or from network functions. In some examples, the Non-RT RIC 250 or the Near-RT RIC 270 may tune RAN behavior or performance. For example, the Non-RT RIC 250 may monitor long-term trends and patterns for performance and may employ AI / ML models to perform corrective actions via the SMO Framework 260 (such as reconfiguration via an O1 interface) or via creation of RAN management policies (such as A1 interface policies) .
[0073] The network node 110, the processing system 145 of the network node 110, the UE 120, the processing system 140 of the UE 120, the CU 210, the DU 230, the RU 240, or any other component (s) of Fig. 1 and / or Fig. 2 may implement one or more techniques or perform one or more operations associated with CSI acquisition and reporting for LTM, as described in more detail elsewhere herein. For example, the processing system 145 of the network node 110, the processing system 140 of the UE 120, the CU 210, the DU 230, or the RU 240 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) . Memory of the network node 110 may store data and program code (or instructions) for the network node 110, the CU 210, the DU 230, or the RU 240. In some examples, the memory of the network node 110 may store data relating to a UE 120, such as RRC state information or a UE context. Memory of a UE 120 may store data and program code (or instructions) for the UE 120, such as context information. In some examples, the memory of the UE 120 or the memory of the network node 110 may include a non-transitory computer-readable medium storing a set of instructions for wireless communication. For example, the set of instructions, when executed by one or more processors (for example, of the processing system 145 or the processing system 140) of the network node 110, the UE 120, the CU 210, the DU 230, or the RU 240, 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.
[0074] In some aspects, the UE 120 includes means for receiving, from a network node 110, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell; means for receiving, from the network node 110, an L1 / L2 message associated with initiating communication with the LTM candidate cell; and / or means for transmitting at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message. The means for the UE 120 to perform operations described herein may include, for example, one or more of communication manager 150, processing system 140, a radio, one or more RF chains, one or more transceivers, one or more antennas, one or more modems, a reception component (for example, reception component 902 depicted and described in connection with Fig. 9) , and / or a transmission component (for example, transmission component 904 depicted and described in connection with Fig. 9) , among other examples.
[0075] In some aspects, the network node 110 includes means for transmitting, to a UE 120, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell; and / or means for transmitting, to the UE 120, an L1 / L2 message associated with initiating communication with the LTM candidate cell. The means for the network node 110 to perform operations described herein may include, for example, one or more of communication manager 155, processing system 145, a radio, one or more RF chains, one or more transceivers, one or more antennas, one or more modems, a reception component (for example, reception component 1002 depicted and described in connection with Fig. 10 ) , and / or a transmission component (for example, transmission component 1004 depicted and described in connection with Fig. 10 ) , among other examples.
[0076] Fig. 3 is a diagram illustrating examples 300, 310, and 320 of CSI-RS beam management procedures, in accordance with the present disclosure. As shown in Fig. 3, examples 300, 310, and 320 include a UE 120 in communication with a network node 110 in a wireless network (e.g., wireless communication network 100) . However, the devices shown in Fig. 3 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 TRP, between a mobile termination node and a control node, between an 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) .
[0077] As shown in Fig. 3, example 300 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 300 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. 3 and example 300, 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 MAC-CE signaling) , and / or aperiodic (e.g., using DCI) .
[0078] 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 multiple times within the same CSI-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 300 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.
[0079] As shown in Fig. 3, example 310 may include a network node 110 and a UE 120 communicating to perform beam management using CSI-RSs. Example 310 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. 3 and example 310, 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.
[0080] As shown in Fig. 3, example 320 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. 3 and example 320, 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) .
[0081] In some aspects, the network node 110 may transmit, and the UE 120 may receive, an LTM configuration that indicates a CSI reporting configuration for one or more LTM candidate cells. For example, the CSI configuration may configure periodic CSI reporting, semi-persistent CSI reporting, and / or aperiodic CSI reporting for transmitting CSI reports associated with LTM candidate cells for an LTM procedure. In some aspects, the LTM configuration may configure the UE 120 to initiate CSI reporting based on receiving an L1 / L2 message triggering a cell switch (e.g., a cell switch command, such as via a MAC-CE) . For example, the L1 / L2 message may include an indication of whether CSI reporting is requested for a LTM candidate cell. Additionally, or alternatively, the UE 120 may receive DCI including a CSI request field associated with a CSI reporting configuration in the LTM candidate cell. In some aspects, the UE 120 may receive an L1 / L2 message (e.g., a MAC-CE) activating a TCI state for the LTM candidate cell, and the message may indicate one or more CSI reports requested after the cell switch. Accordingly, the UE 120 may support beam management procedures after a cell switch, thereby improving beam selection after an LTM procedure.
[0082] As indicated above, Fig. 3 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. 3. 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.
[0083] Fig. 4 is a diagram illustrating an example 400 of an LTM procedure, in accordance with the present disclosure.
[0084] In some examples, a network node 110 may instruct a UE 120 to change serving cells, such as when the UE 120 moves away from coverage of a current serving cell (sometimes referred to as a source cell) and towards coverage of a neighboring cell (sometimes referred to as a target cell) . In some cases, the network node 110 may instruct the UE 120 to change cells using a Layer 3 (L3) handover procedure. An L3 handover procedure may include the network node 110 transmitting, to the UE 120, an RRC reconfiguration message indicating that the UE 120 should perform a handover procedure to a target cell, which may be transmitted in response to the UE 120 providing the network node 110 with an L3 measurement report indicating signal strength measurements associated with various cells (e.g., measurements associated with the source cell and one or more neighboring cells) . In response to receiving the RRC reconfiguration message, the UE 120 may communicate with the source cell and the target cell to detach from the source cell and connect to the target cell (e.g., the UE 120 may establish an RRC connection with the target cell) . Once handover is complete, the target cell may communicate with a user plane function (UPF) of a core network to instruct the UPF to switch a user plane path of the UE 120 from the source cell to the target cell. The target cell may also communicate with the source cell to indicate that handover is complete and that the source cell may be released.
[0085] L3 handover procedures may be associated with high latency and high overhead due to the multiple RRC reconfiguration messages and / or other L3 signaling and operations used to perform the handover procedures. Accordingly, in some examples, a UE 120 may be configured to perform a lower-layer (e.g., L1 and / or L2) handover procedure, sometimes referred to an LTM procedure, such as the example 400 LTM procedure shown in Fig 4. As shown in Fig. 4, the LTM procedure may include an LTM preparation phase, an early synchronization phase (shown as “early sync” in Fig. 4) , an LTM execution phase, and / or an LTM completion phase.
[0086] During the LTM preparation phase, and as shown by reference number 405, the UE 120 may be in an RRC connected state (sometimes referred to as RRC_Connected) with a source cell. As shown by reference number 410, the UE 120 may transmit, and the network node 110 may receive, a measurement report (sometimes referred to as a MeasurementReport) , which may be an L3 measurement report. The measurement report may indicate signal strength measurements (e.g., RSRP, RSSI, RSRQ, and / or CQI) or similar measurements associated with the source cell and / or one or more neighboring cells. In some examples, based at least in part on the measurement report or other information, the network node 110 may decide to use LTM, and thus, as shown by reference number 415, the network node 110 may initiate LTM candidate preparation.
[0087] As shown by reference number 420, the network node 110 may transmit, and the UE 120 may receive, an RRC reconfiguration message (sometimes referred to as an RRCReconfiguration message) , which may include an LTM candidate configuration. More particularly, the RRC reconfiguration message may indicate a configuration of one or more LTM candidate target cells, which may be LTM candidate cells to become a serving cell of the UE and / or cells for which the UE 120 may later be triggered to perform an LTM procedure. As shown by reference number 425, the UE 120 may store the configuration of the one or more LTM candidate cell configurations and, in response, may transmit, to the network node 110, an RRC reconfiguration complete message (sometimes referred to as an RRCReconfigurationComplete message) .
[0088] During the early synchronization phase, and as shown by reference number 430, the UE 120 may optionally perform downlink / uplink synchronization with the LTM candidate cells associated with the one or more LTM candidate cell configurations. For example, the UE 120 may perform downlink synchronization and timing advance acquisition with the one or more candidate target cells prior to receiving an LTM switch command (which is described in more detail below in connection with reference number 445) . In some aspects, performing the early synchronization with the one or more LTM candidate cells may reduce latency associated with performing a RACH procedure later in the LTM procedure, which is described in more detail below in connection with reference number 455.
[0089] During the LTM execution phase, and as shown by reference number 435, the UE 120 may perform L1 measurements on the configured LTM candidate target cells, and thus may transmit, to the network node 110, lower-layer (e.g., L1) measurement reports. As shown by reference number 440, based at least in part on the lower-layer measurement reports, the network node 110 may decide to execute an LTM cell switch to a target cell. Accordingly, as shown by reference number 445, the network node 110 may transmit, and the UE 120 may receive, a MAC-CE or similar message triggering an LTM cell switch (the MAC-CE or similar message is sometimes referred to herein as a cell switch command) . The cell switch command may include an indication of a candidate configuration index associated with the target cell. As shown by reference number 450, based at least in part on receiving the cell switch command, the UE 120 may switch to the configuration of the LTM candidate target cell (e.g., the UE 120 may detach from the source cell and apply the target cell configuration) . Moreover, as shown by reference number 455, the UE 120 may perform a RACH procedure towards the target cell, such as when a timing advance associated with the target cell is not available (e.g., in examples in which the UE 120 did not perform the early synchronization as described above in connection with reference number 430) .
[0090] During the LTM completion phase, and as shown by reference number 460, the UE 120 may indicate successful completion of the LTM cell switch towards the target cell. In this way, cell switch to a target cell may be performed using less overhead than for an L3 handover procedure and / or a cell switch to a target cell may be associated with reduced latency as compared to L3 handover procedure.
[0091] In some examples as described herein, the LTM procedure may support early CSI measurement and reporting. For example, the network node 110 may transmit, and the UE 120 may receive, an LTM configuration (e.g., during LTM preparation) that indicates a CSI reporting configuration for one or more LTM candidate cells (e.g., candidate target cells) . For example, the CSI configuration may configure periodic CSI reporting, semi-persistent CSI reporting, and / or aperiodic CSI reporting for transmitting CSI reports associated with LTM candidate cells for an LTM procedure. In some aspects, the LTM configuration may configure the UE 120 to initiate CSI reporting based on receiving an L1 / L2 message triggering a cell switch (e.g., a cell switch command, such as via a MAC-CE) . For example, the L1 / L2 message may include an indication of whether CSI reporting is requested for a LTM candidate cell. Additionally, or alternatively, the UE 120 may receive DCI including a CSI request field associated with a CSI reporting configuration in the LTM candidate cell. In some aspects, the UE 120 may receive an L1 / L2 message (e.g., a MAC-CE) activating a TCI state for the LTM candidate cell, and the message may indicate one or more CSI reports requested after the cell switch. Accordingly, the UE 120 may support beam management procedures after a cell switch, thereby improving beam selection after an LTM procedure.
[0092] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with respect to Fig. 4.
[0093] Fig. 5 is a diagram illustrating an example 500 associated with CSI acquisition and reporting for LTM, in accordance with the present disclosure. As shown in Fig. 5, example 500 includes communication between a UE 120 and a network node 110 (e.g., one or more networks nodes that provide a source cell and / or a target cell in an inter-cell mobility scenario) . In some aspects, the UE 120 and the network node 110 may communicate in a wireless network, such as wireless communication network 100. The UE 120 and the network node 110 may communicate via a wireless access link, which may include an uplink and a downlink.
[0094] Furthermore, as described herein, the wireless network in which the UE 120 and the network node 110 communicate may support techniques for UE mobility between cells using L1 / L2 signaling. While the example 500 illustrates a cell switch associated with SpCells 505, such as a cell switch from a source SpCell 505a to a candidate SpCell 505b (e.g., a target SpCell) , the techniques described herein may be generally applied to cell switch procedures associated with other cell types (e.g., SCells) . While the network node 110 is shown separately from the SpCells 505, in some aspects, the network node 110 may be or may include one or more of the SpCells 505 (e.g., the source SpCell 505a) . Additionally, or alternatively, signaling or operations associated with the network node 110 may be instead performed by one or more of the SpCells 505 (e.g., the source SpCell 505a, the candidate SpCell 505b) .
[0095] As shown in the example 500, the UE 120 may receive an LTM configuration 510 from the network node 110. In some aspects, the LTM configuration 510 may indicate one or more CSI configurations (e.g., CSI measurement configurations and / or CSI reporting configurations) for the candidate SpCells 505. In some examples, the LTM configuration 510 may indicate a CSI configuration associated with early periodic CSI reporting. For example, the CSI configuration may include an uplink control channel configuration (e.g., a PUCCH configuration) that configures one or more resources (e.g., PUCCH resources) for periodic transmission of one or more CSI reports.
[0096] In some aspects, the CSI configuration may configure the UE 120 to perform the periodic CSI reports for one or more candidate SpCells cells 505 (e.g., the SpCell 505b, an SpCell 505c, an SpCell 505d) based on receiving an L1 / L2 message. For example, the CSI configuration may indicate the UE to perform periodic CSI reporting based on receiving a cell switch command (e.g., an LTM cell switch command) , which may be transmitted via an L1 / L2 message (e.g., a MAC-CE message) . In some examples, the cell switch command may include one or more bits indicating whether periodic CSI reporting is requested after the cell switch procedure. For example, a first value indicated by the one or more bits may indicate that periodic CSI reporting is requested, and a second value indicated by the one or more bits may indicate that periodic CSI reporting is not requested. Additionally, or alternatively, the CSI configuration for the periodic CSI reporting may include a flag (e.g., an RRC flag or an RRC field) that indicates whether periodic CSI reporting is requested by the cell switch command. For example, inclusion of the flag in the periodic CSI reporting may indicate that reception of a cell switch command triggers periodic CSI reporting, and an absence of the flag in the CSI configuration (for example, or inclusion of a different flag) may indicate that periodic CSI reporting is not requested (e.g., and the cell switch command does not trigger periodic CSI reporting) . Additionally, or alternatively, a first value of the flag may indicate that periodic CSI reporting is requested and a second value of the flag may indicate that periodic CSI reporting is not requested.
[0097] In some examples, if periodic CSI reporting is requested for a candidate SpCell 505 (e.g., based on one or more bits of the cell switch command and / or a flag included in CSI configuration) , the UE 120 may begin performing periodic CSI reporting after receiving the cell switch command. For example, the UE 120 may transmit a periodic CSI report via a resource configured using the CSI configuration after receiving the cell switch command (e.g., using an earliest resource following the cell switch command) . In some other examples, periodic CSI reporting may not be requested (e.g., based on the one or more bits of the cell switch command and / or an absence of the flag in the CSI configuration) . In such examples, the UE 120 may refrain from initiating periodic CSI reporting (e.g., for at least a duration) . For example, the UE 120 may be configured (e.g., via the CSI configuration) to wait to perform the periodic CSI reporting until after a reconfiguration procedure is completed, such as after transmission of an RRC reconfiguration complete message (e.g., as described with respect to reference number 425 of Fig. 4) for a target cell.
[0098] In some cases, when the UE 120 receives the CSI configuration configuring periodic CSI measurements associated with the candidate SpCell 505b, the UE 120 may be configured to update a measurement result associated with the SpCell 505b after performing each periodic CSI measurement. For example, if the UE 120 does not receive an indication to perform a CSI report (e.g., via an L1 / L2 message) , the UE 120 may perform CSI measurements and update the measurement result to be reported after CSI reporting is requested. In some aspects, the UE 120 may be configured to continue performing CSI measurements and updating the measurement result until the UE 120 receives a cell switch command (e.g., for initiating a cell switch to the SpCell 505b) . Additionally, or alternatively, the UE 120 may be configured to transmit an acknowledgment message associated with reception of the cell switch command, and the UE 120 may continue performing CSI measurements and updating the measurement result until a duration (e.g., X milliseconds (ms) , X symbols or a quantity of another transmission interval) elapses after the UE 120 transmits the acknowledgment message.
[0099] In some examples, the CSI configuration may be or may include a configuration associated with performing early semi-persistent CSI reports. For example, the CSI configuration may indicate one or more resources for transmitting one or more semi-persistent CSI reports. For example, the CSI configuration may indicate a configured grant PUSCH (CG-PUSCH) configuration and / or an uplink control channel configuration (e.g., a PUCCH configuration) that configures one or more resources (e.g., CG-PUSCH resources and / or PUCCH resources) for transmitting the one or more semi-persistent CSI reports.
[0100] In some aspects, the CSI configuration may configure the UE 120 to perform the semi-persistent CSI reports for one or more candidate SpCells cells 505 based on receiving an L1 / L2 message (e.g., as described with reference to periodic CSI reporting) . For example, the CSI configuration may indicate that the UE 120 is to perform semi-persistent CSI reporting based on receiving the cell switch command (e.g., a MAC-CE cell switch command) , and the cell switch command may include one or more bits indicating whether semi-persistent CSI reporting is requested after the cell switch procedure. Additionally, or alternatively, the CSI configuration for the semi-persistent CSI reporting may include a flag (e.g., an RRC flag or RRC field) that indicates whether semi-persistent CSI reporting is requested by the cell switch command (e.g., whether the cell switch command triggers semi-persistent CSI reporting) . In some examples, if semi-persistent CSI reporting is requested for a candidate SpCell 505, the UE 120 may begin performing semi-persistent CSI reporting after receiving the cell switch command. In some aspects, if semi-persistent CSI reporting is not requested (e.g., based on the one or more bits of the cell switch command, based on an absence of the flag in the CSI configuration) , the UE 120 may wait to initiate the semi-persistent CSI reporting until after a reconfiguration procedure is completed (e.g., for the target SpCell 505) . Additionally, or alternatively, a first value of the flag may indicate that periodic CSI reporting is requested and a second value of the flag may indicate that periodic CSI reporting is not requested
[0101] In some examples, the CSI configuration may configure the UE 120 such that semi-persistent CSI reporting for a candidate SpCell 505 is activated (e.g., triggered) based on DCI. For example, the UE 120 may receive (e.g., from the network node 110, from the source SpCell 505a) DCI that includes a CSI request field that may trigger the UE 120 to perform semi-persistent CSI reporting for the candidate SpCell 505b. In some cases, the DCI may be uplink DCI that schedules one or more resources for transmission of one or more semi-persistent CSI reports. In some examples, the DCI may be associated with a semi-persistent CSI reporting configuration (e.g., included in the LTM configuration 510) . For example, the DCI may include one or more cyclic redundancy check (CRC) bits associated with a CRC process for validating the received DCI, and the one or more CRC bits may be scrambled based on a radio network temporary identifier (RNTI) associated with the semi-persistent CSI reporting configuration for the candidate SpCell 505b. For example, the one or more CRC bits may be scrambled in accordance with a semi-persistent CSI RNTI (SP-CSI-RNTI) associated with the CSI reporting configuration (e.g., the semi-persistent CSI configuration) indicated via the LTM configuration 510 for the candidate SpCell 505b. Accordingly, receiving the DCI having the one or more CRC bits scrambled in accordance with the RNTI associated with the semi-persistent CSI reporting configuration for the candidate SpCell 505b may trigger the UE 120 to initiate semi-persistent CSI reporting for the candidate SpCell 505b.
[0102] In some examples, the uplink DCI scheduling the one or more resources may be received such that the UE 120 may have time to perform CSI measurements prior to receiving the cell switch command (e.g., prior to receiving the LTM cell switch command MAC-CE) . For example, the uplink DCI may be transmitted at least some duration (e.g., a time duration, a quantity of CSI-RS occasions) prior to the cell switch command, such that the UE 120 may perform the CSI measurements during the duration. Additionally, or alternatively, the uplink DCI scheduling the one or more resources may be received such that the UE 120 may perform CSI measurements after receiving the cell switch command and before transmitting an acknowledgment message associated with the cell switch command.
[0103] Additionally, or alternatively, the CSI configuration may configure the UE 120 such that semi-persistent CSI reporting for the candidate SpCell 505b is activated (e.g., triggered) based on an L1 / L2 message (e.g., a MAC-CE) activating a TCI state (e.g., an uplink TCI state, a joint uplink and downlink TCI state, a downlink TCI state) for the candidate SpCell 505b (e.g., the target cell) . In some examples, the L1 / L2 message activating the TCI state for the SpCell 505b may indicate one or more CSI reports for transmission after the cell switch. For example, the L1 / L2 message activating the TCI state may indicate one or more resources for transmission of semi-persistent CSI reports that may have been previously configured to the UE 120 (e.g., via the CSI configuration) , and the L1 / L2 message activating the TCI state may request that the UE 120 transmits the one or more CSI reports via the indicated resources.
[0104] In some cases, when the UE 120 receives the CSI configuration configuring semi-persistent CSI measurements associated with the candidate SpCell 505b, the UE 120 may be configured to update a measurement result associated with the SpCell 505b after performing each CSI measurement. For example, if the UE 120 does not receive an indication to perform a CSI report (e.g., via an L1 / L2 message) , the UE 120 may perform CSI measurements and update the measurement result to be reported after CSI reporting is requested. In some aspects, the UE 120 may be configured to continue performing semi-persistent CSI measurements and updating the measurement result until the UE 120 receives a cell switch command (e.g., for initiating a cell switch to the SpCell 505b) . Additionally, or alternatively, the UE 120 may continue performing semi-persistent CSI measurements and updating the measurement result until a duration (e.g., X ms or X symbols or a quantity of another transmission interval) elapses after the UE 120 transmits an acknowledgment message (e.g., to the source SpCell 505a) responsive to the cell switch command.
[0105] In some examples, the CSI configuration may be or may include a configuration associated with performing early aperiodic CSI reports. For example, the CSI configuration may indicate that early aperiodic CSI reporting is triggered to be reported after an LTM cell switch procedure.
[0106] In some aspects, the CSI configuration may configure the UE 120 to perform aperiodic CSI reporting based on receiving the cell switch command (e.g., via a MAC-CE) . In some examples, the cell switch command may include one or more bits indicating whether aperiodic CSI reporting is requested after the cell switch procedure. Additionally, or alternatively, the CSI configuration associated with the early aperiodic CSI reporting may include a flag (e.g., an RRC flag or RRC field) that indicates whether aperiodic CSI reporting is requested by the cell switch command (e.g., whether the cell switch command triggers aperiodic CSI reporting) . In some examples, if aperiodic CSI reporting is requested for a candidate SpCell 505, the UE 120 may transmit an aperiodic CSI report after receiving the cell switch command. In some aspects, if aperiodic CSI reporting is not requested (e.g., based on the one or more bits of the cell switch command, based on an absence of the flag in the CSI configuration) , the UE 120 may refrain from transmitting an aperiodic CSI report.
[0107] Additionally, or alternatively, the CSI configuration may configure the UE 120 such that aperiodic CSI reporting for a candidate SpCell 505 is activated (e.g., triggered) based on DCI. For example, the UE 120 may receive (e.g., from the network node 110, from a serving cell) DCI that includes a CSI request field that may trigger the UE 120 to perform aperiodic CSI reporting for the candidate SpCell 505b. In some cases, the DCI may be uplink DCI that schedules one or more resources for transmission of one or more aperiodic CSI reports. In some examples, the CSI request field may be associated with an aperiodic CSI reporting configuration for the SpCell 505b (e.g., included in the LTM configuration 510) . For example, the DCI may include one or more CRC bits associated with a CRC process for validating the received DCI, and the one or more CRC bits may be scrambled based on an RNTI associated with the aperiodic CSI reporting configuration for the candidate SpCell 505b. In some aspects, the one or more CRC bits may be scrambled in accordance with a cell RNTI (C-RNTI) associated with the candidate SpCell 505b. Accordingly, receiving the DCI having the one or more CRC bits scrambled in accordance with the C-RNTI may trigger the UE 120 to initiate aperiodic CSI reporting for the candidate SpCell 505b.
[0108] In some cases, the UE 120 may receive the CSI configuration configuring periodic or semi-persistent CSI measurements associated with the candidate SpCell 505b for reporting via an aperiodic CSI report. The UE 120 may be configured to update a measurement result associated with the SpCell 505b after performing each CSI measurement. For example, if the UE 120 is not triggered to perform an aperiodic CSI report, the UE 120 may perform CSI measurements and update the measurement result to be reported after an aperiodic CSI report is requested. In some aspects, the UE 120 may be configured to continue performing semi-persistent CSI measurements and updating the measurement result until a duration (e.g., X ms, X symbols or a quantity of another transmission interval) elapses after the UE 120 transmits an acknowledgment message (e.g., to the source SpCell 505a) associated with receiving the cell switch command.
[0109] In some examples, the UE 120 may perform the LTM cell switch procedure to initiate communications with a target SpCell 505 based on a RACH procedure or a RACH-less procedure, and the UE 120 may transmit an aperiodic CSI report during an LTM execution phase associated with initiating the communications with the target SpCell 505. For example, the UE 120 may use a RACH procedure to initiate communications with the target SpCell 505 (e.g., the candidate SpCell 505b) , as described herein with respect to the reference number 455 of Fig. 4. Alternatively, the UE 120 may initiate communications with the target SpCell 505 using a RACH-less procedure, which may be based on the UE 120 performed early synchronization with the target SpCell 505.
[0110] In some aspects, for an LTM cell switch procedure based on a RACH procedure, the UE 120 may be configured (e.g., via the LTM configuration 510) to include the aperiodic CSI report in an uplink message (e.g., a Msg3 PUSCH) scheduled by an uplink grant included in a random access response message (e.g., Msg 2) of the RACH procedure. In some examples, for a RACH-less LTM cell switch procedure, the UE 120 may be configured (e.g., via the LTM configuration 510) to transmit an aperiodic CSI report via an earliest (e.g., first) uplink channel or configured grant transmission (e.g., a CG-PUSCH transmission) after receiving the cell switch command for the RACH-less LTM cell switch procedure. Additionally, or alternatively, the UE 120 may transmit the aperiodic CSI report via a dynamic grant or configured grant transmission (e.g., dynamic grant PUSCH or CG-PUSCH) that includes an RRC reconfiguration complete message for the RACH-less LTM cell switch procedure.
[0111] Accordingly, the UE 120 may be configured to perform CSI measurement and reporting in accordance with the LTM configuration 510 and the received L1 / L2 message (e.g., DCI, a MAC-CE, the cell switch command) . Thus, the UE 120 may support early CSI reporting for LTM cell switch procedures, thereby improving selection of beams and other transmission parameters and improving communications with an SpCell 505.
[0112] As indicated above, Fig. 5 is provided as an example. Other examples may differ from what is described with respect to Fig. 5.
[0113] Fig. 6 is a diagram illustrating an example 600, an example 605, and an example 610 associated with CSI acquisition and reporting for LTM, in accordance with the present disclosure. In some aspects, Fig. 6 illustrates different examples for the timing of CSI measurements and / or CSI reports performed by a UE 120 in relation to a cell switch command 640 (e.g., an LTM cell switch command) , as described herein.
[0114] In the example 600, CSI measurement and CSI reporting may be performed prior to reception of the cell switch command 640. For example, the UE 120 may receive a configuration message 615, which may include an LTM configuration indicating one or more CSI measurement and / or reporting configurations associated with a LTM candidate cell, as described herein. In some aspects, the configuration message 615 may be transmitted via DCI, a MAC-CE, an RRC message, other signaling, or any combination thereof. The configuration message 615 may configure one or more CSI-RS occasions 620 associated with one or more LTM candidate cells. For example, the one or more CSI-RS occasions 620 may correspond to occasions during which the one or more LTM candidate cells may transmit one or more CSI-RSs, and the UE 120 may be configured to perform CSI measurements during at least some of the one or more CSI-RS occasions 620.
[0115] As shown by the example 600, the configuration message 615 may configure a reporting resource 635 for transmission of a CSI report (e.g., a periodic CSI report, a semi-persistent CSI report, and / or an aperiodic CSI report) associated with CSI measurements performed during the one or more CSI-RS occasions 620. In some aspects, the configuration message may configure the reporting resource 635 based on an offset 630 from a CSI reference resource 625, and the CSI reference resource 625 and / or the offset 630 may be configured via the configuration message 615 or via other signaling (e.g., a CSI configuration) .
[0116] Accordingly, the UE 120 may perform CSI measurements during the one or more CSI-RS occasions 620, and the UE 120 may transmit a CSI report associated with one or more LTM candidate cells via the reporting resource 635. In some examples, the CSI report may be transmitted to a serving cell of the UE 120, and the serving cell may transfer (e.g., transmit or otherwise send) the CSI report to one or more LTM candidate cells and / or a target cell (e.g., measurements corresponding to a respective cell) . The UE 120 may receive the cell switch command 640 after transmitting the CSI report, and the cell switch command 640 may indicate a LTM candidate cell of the one or more LTM candidate cells as a target cell for a cell switch procedure (e.g., based on the CSI report) .
[0117] The example 605 and the example 610 illustrate examples where the CSI report may be transmitted after receiving the cell switch command 640. Accordingly, the UE 120 may be configured to transmit the CSI report directly to the target cell based on receiving the cell switch command 640, as described herein.
[0118] For example, as illustrated by the example 605, the UE 120 may receive the configuration message 615 indicating the one or more CSI-RS occasions 620 for the one or more LTM candidate cells. The UE 120 may perform CSI measurements during the CSI-RS occasions 620 for the one or more LTM candidate cells. In some aspects, the UE 120 may receive the cell switch command 640 indicating a target cell (e.g., from the one or more LTM candidate cells) , and the UE 120 may continue performing CSI measurements after the cell switch command 640. For example, the UE 120 may perform CSI measurements during one or more CSI-RS occasions 645 associated with the target cell, and the UE 120 may update a measurement result based on the CSI measurements associated with the target cell. The UE 120 may transmit a CSI report to the target cell using the reporting resource 635, which may be indicated by the cell switch command 640, the configuration message 615, other signaling (e.g., DCI) , or any combination thereof, (e.g., as described herein with reference to Fig. 5) .
[0119] The example 610 illustrates an example where the UE 120 may perform CSI measurements after receiving the cell switch command 640 indicating a target cell. For example, the UE 120 may receive the cell switch command 640 triggering CSI measurements during the one or more CSI-RS occasions 645 associated with the target cell, as described herein. Additionally, or alternatively, the cell switch command 640 may indicate the one or more CSI-RS occasions 645 associated with the target cell and indicate the UE 120 to perform the corresponding CSI measurements. In some aspects, the one or more CSI-RS occasions 645 associated with the target cell may be configured via a previously-received CSI configuration (e.g., via an LTM configuration) . The UE 120 may transmit a CSI report to the target cell via the reporting resource 635 based on performing the CSI measurements. In some examples, the reporting resource 635 may be configured based on based on the offset 630 from the CSI reference resource 625, and the CSI reference resource 625 and / or the offset 630 may be configured via the cell switch command 640 or via the previously-received CSI configuration.
[0120] Accordingly, the UE 120 may be configured to perform CSI measurement and reporting in accordance with the received cell switch command 640, thereby supporting early CSI reporting for LTM cell switch procedures.
[0121] As indicated above, Fig. 6 is provided as an example. Other examples may differ from what is described with respect to Fig. 6.
[0122] 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 CSI acquisition and reporting for LTM.
[0123] As shown in Fig. 7, in some aspects, process 700 may include receiving, from a network node, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell (block 710) . For example, the UE (e.g., using reception component 902 and / or communication manager 906, depicted in Fig. 9) may receive, from a network node, the LTM configuration associated with the LTM candidate cell, wherein the LTM configuration indicates the CSI reporting configuration for the LTM candidate cell, as described above.
[0124] As further shown in Fig. 7, in some aspects, process 700 may include receiving, from the network node, an L1 / L2 message associated with initiating communication with the LTM candidate cell (block 720) . For example, the UE (e.g., using reception component 902 and / or communication manager 906, depicted in Fig. 9) may receive, from the network node, an L1 / L2 message associated with initiating communication with the LTM candidate cell, as described above.
[0125] As further shown in Fig. 7, in some aspects, process 700 may include transmitting at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message (block 730) . For example, the UE (e.g., using transmission component 904 and / or communication manager 906, depicted in Fig. 9) may transmit at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message, as described above.
[0126] 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.
[0127] In a first aspect, the CSI reporting configuration indicates an uplink control channel configuration or a configured grant configuration associated with one or more uplink resources for transmission of the at least one CSI report.
[0128] In a second aspect, the L1 / L2 message is a cell switch command indicating whether CSI reporting is requested after the UE initiates communication with the LTM candidate cell.
[0129] In a third aspect, the at least one CSI report is transmitted by the UE based at least in part on reception of the cell switch command in accordance with the cell switch command indicating that CSI reporting is requested.
[0130] In a fourth aspect, the at least one CSI report is transmitted by the UE after completion of a reconfiguration procedure associated with the LTM candidate cell based at least in part on the cell switch command indicating that CSI reporting is not requested.
[0131] In a fifth aspect, the L1 / L2 message comprises a cell switch command, and the CSI reporting configuration includes a flag indicating that CSI reporting is activated by the cell switch command.
[0132] In a sixth aspect, process 700 includes updating one or more CSI measurements associated with the LTM candidate cell prior to transmission of the at least one CSI report in accordance with the CSI reporting configuration, wherein the at least one CSI report is transmitted after receiving the L1 / L2 message, the L1 / L2 message comprising a cell switch command.
[0133] In a seventh aspect, process 700 includes transmitting an acknowledgment message associated with the cell switch command, wherein the at least one CSI report is transmitted a duration after transmitting the acknowledgment message.
[0134] In an eighth aspect, the CSI reporting configuration includes at least one of a periodic CSI reporting configuration, a semi-persistent CSI reporting configuration, or an aperiodic CSI reporting configuration.
[0135] In a ninth aspect, the L1 / L2 message comprises DCI scrambled in accordance with an RNTI associated with the CSI reporting configuration for the LTM candidate cell, the DCI including a field that requests the at least one CSI report.
[0136] In a tenth aspect, process 700 includes performing one or more CSI measurements associated with the LTM candidate cell prior to receiving a cell switch command associated with initiating communication with the LTM candidate cell based at least in part on the DCI.
[0137] In an eleventh aspect, process 700 includes receiving a cell switch command associated with initiating communication with the LTM candidate cell, and performing one or more CSI measurements associated with the LTM candidate cell after receiving the cell switch command and prior to transmitting an acknowledgment message associated with the cell switch command based at least in part on the DCI.
[0138] In a twelfth aspect, the L1 / L2 message comprises a MAC-CE that activates a TCI state associated with the LTM candidate cell and requests transmission of the at least one CSI report after the UE initiates communication with the LTM candidate cell.
[0139] In a thirteenth aspect, the at least one CSI report comprises an aperiodic CSI report transmitted after a cell switch command, and wherein the L1 / L2 message is the cell switch command.
[0140] In a fourteenth aspect, the aperiodic CSI report is transmitted via an uplink message associated with an earliest available uplink channel resource or configured grant resource following the L1 / L2 message.
[0141] In a fifteenth aspect, the aperiodic CSI report is transmitted via an RRC message associated with completion of a reconfiguration procedure associated with the LTM candidate cell.
[0142] In a sixteenth aspect, process 700 includes transmitting a random access request message associated with initiating communication with the LTM candidate cell, and receiving an uplink grant based at least in part on the random access request message, wherein the at least one CSI report is transmitted via a resource scheduled by the uplink grant.
[0143] 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.
[0144] 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 CSI acquisition and reporting for LTM.
[0145] As shown in Fig. 8, in some aspects, process 800 may include transmitting, to a UE, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell (block 810) . For example, the network node (e.g., using transmission component 1004 and / or communication manager 1006, depicted in Fig. 10) may transmit, to the UE, the LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell, as described above.
[0146] As further shown in Fig. 8, in some aspects, process 800 may include transmitting, to the UE, an L1 / L2 message associated with initiating communication with the LTM candidate cell (block 820) . For example, the network node (e.g., using transmission component 1004 and / or communication manager 1006, depicted in Fig. 10) may transmit, to the UE, an L1 / L2 message associated with initiating communication with the LTM candidate cell, as described above.
[0147] 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.
[0148] In a first aspect, the CSI reporting configuration indicates an uplink control channel configuration or a configured grant configuration associated with one or more uplink resources for transmission of at least one CSI report.
[0149] In a second aspect, the L1 / L2 message is a cell switch command indicating whether CSI reporting is requested after the UE initiates communication with the LTM candidate cell.
[0150] In a third aspect, transmitting the cell switch command triggers at least one CSI report to be transmitted by the UE based at least in part the cell switch command indicating that CSI reporting is requested.
[0151] In a fourth aspect, transmitting the cell switch command triggers at least one CSI report to be transmitted by the UE after completion of a reconfiguration procedure associated with the LTM candidate cell based at least in part on the cell switch command indicating that CSI reporting is not requested.
[0152] In a fifth aspect, the L1 / L2 message comprises a cell switch command, and the CSI reporting includes a flag indicating that CSI reporting is activated by the cell switch command.
[0153] In a sixth aspect, process 800 includes receiving, from the UE, an acknowledgment message associated with a cell switch command, the L1 / L2 message comprising the cell switch command, wherein at least one CSI report is transmitted a duration after receiving the acknowledgment message.
[0154] In a seventh aspect, the CSI reporting configuration includes at least one of a periodic CSI reporting configuration, a semi-persistent CSI reporting configuration, or an aperiodic CSI reporting configuration.
[0155] In an eighth aspect, the L1 / L2 message comprises DCI scrambled in accordance with a radio network temporary identifier associated with the CSI reporting configuration for the LTM candidate cell, the DCI including a field that requests at least one CSI report.
[0156] In a ninth aspect, the L1 / L2 message comprises a MAC-CE that activates a TCI state associated with the LTM candidate cell and requests transmission of at least one CSI report after initiating communication with the LTM candidate cell.
[0157] In a tenth aspect, the L1 / L2 message comprises a cell switch command that triggers transmission of an aperiodic CSI report by the UE.
[0158] In an eleventh aspect, the aperiodic CSI report is transmitted via an uplink message associated with an earliest available uplink channel resource or configured grant resource following the L1 / L2 message.
[0159] In a twelfth aspect, the aperiodic CSI report is transmitted via a radio resource control message associated with completion of a reconfiguration procedure associated with the LTM candidate cell.
[0160] 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.
[0161] 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 150 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. The communication manager 906 may be included in, or implemented via, a processing system (for example, the processing system 140 described in connection with Fig. 1) of the UE.
[0162] In some aspects, the apparatus 900 may be configured to perform one or more operations described herein in connection with Figs. 3–6. Additionally, or alternatively, the apparatus 900 may be configured to perform one or more processes described herein, such as process 700 of Fig. 7. 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. 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. 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.
[0163] 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, 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 components of the UE described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the UE.
[0164] 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, and may transmit the processed signals to the apparatus 908. In some aspects, the transmission component 904 may include one or more components of the UE described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the UE described in connection with Fig. 1. In some aspects, the transmission component 904 may be co-located with the reception component 902.
[0165] 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.
[0166] The reception component 902 may receive, from a network node, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell. The reception component 902 may receive, from the network node, an L1 / L2 message associated with initiating communication with the LTM candidate cell. The transmission component 904 may transmit at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message.
[0167] The communication manager 906 may update one or more CSI measurements associated with the LTM candidate cell prior to transmission of the at least one CSI report in accordance with the CSI reporting configuration, wherein the at least one CSI report is transmitted after receiving the L1 / L2 message, the L1 / L2 message comprising a cell switch command.
[0168] The transmission component 904 may transmit an acknowledgment message associated with the cell switch command, wherein the at least one CSI report is transmitted a duration after transmitting the acknowledgment message.
[0169] The communication manager 906 may perform one or more CSI measurements associated with the LTM candidate cell prior to receiving a cell switch command associated with initiating communication with the LTM candidate cell based at least in part on the DCI.
[0170] The reception component 902 may receive a cell switch command associated with initiating communication with the LTM candidate cell. The communication manager 906 may perform one or more CSI measurements associated with the LTM candidate cell after receiving the cell switch command and prior to transmitting an acknowledgment message associated with the cell switch command based at least in part on the DCI.
[0171] The transmission component 904 may transmit a random access request message associated with initiating communication with the LTM candidate cell. The reception component 902 may receive an uplink grant based at least in part on the random access request message, wherein the at least one CSI report is transmitted via a resource scheduled by the uplink grant.
[0172] 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.
[0173] 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 155 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. The communication manager 1006 may be included in, or implemented via, a processing system (for example, the processing system 145 described in connection with Fig. 1) of the network node.
[0174] In some aspects, the apparatus 1000 may be configured to perform one or more operations described herein in connection with Figs. 3–6. Additionally, or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as process 800 of Fig. 8. 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. 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. 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.
[0175] 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, 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 components of the network node described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the network node. 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.
[0176] 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, and may transmit the processed signals to the apparatus 1008. In some aspects, the transmission component 1004 may include one or more components of the network node described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the network node described in connection with Fig. 1. In some aspects, the transmission component 1004 may be co-located with the reception component 1002.
[0177] 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.
[0178] The transmission component 1004 may transmit, to a UE, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell. The transmission component 1004 may transmit, to the UE, an L1 / L2 message associated with initiating communication with the LTM candidate cell.
[0179] The reception component 1002 may receive, from the UE, an acknowledgment message associated with a cell switch command, the L1 / L2 message comprising the cell switch command, wherein at least one CSI report is transmitted a duration after receiving the acknowledgment message.
[0180] 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.
[0181] The following provides an overview of some Aspects of the present disclosure:
[0182] Aspect 1: A method of wireless communication performed by a UE, comprising: receiving, from a network node, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell; receiving, from the network node, an L1 / L2 message associated with initiating communication with the LTM candidate cell; and transmitting at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message.
[0183] Aspect 2: The method of Aspect 1, wherein the CSI reporting configuration indicates an uplink control channel configuration or a configured grant configuration associated with one or more uplink resources for transmission of the at least one CSI report.
[0184] Aspect 3: The method of any of Aspects 1 or 2, wherein the L1 / L2 message is a cell switch command indicating whether CSI reporting is requested after the UE initiates communication with the LTM candidate cell.
[0185] Aspect 4: The method of Aspect 3, wherein the at least one CSI report is transmitted by the UE based at least in part on reception of the cell switch command in accordance with the cell switch command indicating that CSI reporting is requested.
[0186] Aspect 5: The method of Aspect 3, wherein the at least one CSI report is transmitted by the UE after completion of a reconfiguration procedure associated with the LTM candidate cell based at least in part on the cell switch command indicating that CSI reporting is not requested.
[0187] Aspect 6: The method of any of Aspects 1-5, wherein the L1 / L2 message comprises a cell switch command, and the CSI reporting configuration includes a flag indicating that CSI reporting is activated by the cell switch command.
[0188] Aspect 7: The method of any of Aspects 1-6, further comprising: updating one or more CSI measurements associated with the LTM candidate cell prior to transmission of the at least one CSI report in accordance with the CSI reporting configuration, wherein the at least one CSI report is transmitted after receiving the L1 / L2 message, the L1 / L2 message comprising a cell switch command.
[0189] Aspect 8: The method of Aspect 7, further comprising: transmitting an acknowledgment message associated with the cell switch command, wherein the at least one CSI report is transmitted a duration after transmitting the acknowledgment message.
[0190] Aspect 9: The method of any of Aspects 1-8, wherein the CSI reporting configuration includes at least one of a periodic CSI reporting configuration, a semi-persistent CSI reporting configuration, or an aperiodic CSI reporting configuration.
[0191] Aspect 10: The method of any of Aspects 1-9, wherein the L1 / L2 message comprises DCI scrambled in accordance with a radio network temporary identifier associated with the CSI reporting configuration for the LTM candidate cell, the DCI including a field that requests the at least one CSI report.
[0192] Aspect 11: The method of Aspect 10, further comprising: performing one or more CSI measurements associated with the LTM candidate cell prior to receiving a cell switch command associated with initiating communication with the LTM candidate cell based at least in part on the DCI.
[0193] Aspect 12: The method of Aspect 10, further comprising: receiving a cell switch command associated with initiating communication with the LTM candidate cell; and performing one or more CSI measurements associated with the LTM candidate cell after receiving the cell switch command and prior to transmitting an acknowledgment message associated with the cell switch command based at least in part on the DCI.
[0194] Aspect 13: The method of any of Aspects 1-12, wherein the L1 / L2 message comprises a MAC-CE that activates a TCI state associated with the LTM candidate cell and requests transmission of the at least one CSI report after the UE initiates communication with the LTM candidate cell.
[0195] Aspect 14: The method of any of Aspects 1-13, wherein the at least one CSI report comprises an aperiodic CSI report transmitted after a cell switch command, and wherein the L1 / L2 message is the cell switch command.
[0196] Aspect 15: The method of Aspect 14, wherein the aperiodic CSI report is transmitted via an uplink message associated with an earliest available uplink channel resource or configured grant resource following the L1 / L2 message.
[0197] Aspect 16: The method of Aspect 14, wherein the aperiodic CSI report is transmitted via a radio resource control message associated with completion of a reconfiguration procedure associated with the LTM candidate cell.
[0198] Aspect 17: The method of any of Aspects 1-16, further comprising: transmitting a random access request message associated with initiating communication with the LTM candidate cell; and receiving an uplink grant based at least in part on the random access request message, wherein the at least one CSI report is transmitted via a resource scheduled by the uplink grant.
[0199] Aspect 18: A method of wireless communication performed by a network node, comprising: transmitting, to a UE, an LTM configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a CSI reporting configuration for the LTM candidate cell; and transmitting, to the UE, an L1 / L2 message associated with initiating communication with the LTM candidate cell.
[0200] Aspect 19: The method of Aspect 18, wherein the CSI reporting configuration indicates an uplink control channel configuration or a configured grant configuration associated with one or more uplink resources for transmission of at least one CSI report.
[0201] Aspect 20: The method of any of Aspects 18-19, wherein the L1 / L2 message is a cell switch command indicating whether CSI reporting is requested after the UE initiates communication with the LTM candidate cell.
[0202] Aspect 21: The method of Aspect 20, wherein transmitting the cell switch command triggers at least one CSI report to be transmitted by the UE based at least in part the cell switch command indicating that CSI reporting is requested.
[0203] Aspect 22: The method of Aspect 20, wherein transmitting the cell switch command triggers at least one CSI report to be transmitted by the UE after completion of a reconfiguration procedure associated with the LTM candidate cell based at least in part on the cell switch command indicating that CSI reporting is not requested.
[0204] Aspect 23: The method of any of Aspects 18-22, wherein the L1 / L2 message comprises a cell switch command, and the CSI reporting includes a flag indicating that CSI reporting is activated by the cell switch command.
[0205] Aspect 24: The method of Aspect 23, further comprising: receiving, from the UE, an acknowledgment message associated with a cell switch command, the L1 / L2 message comprising the cell switch command, wherein at least one CSI report is transmitted a duration after receiving the acknowledgment message.
[0206] Aspect 25: The method of any of Aspects 18-24, wherein the CSI reporting configuration includes at least one of a periodic CSI reporting configuration, a semi-persistent CSI reporting configuration, or an aperiodic CSI reporting configuration.
[0207] Aspect 26: The method of any of Aspects 18-25, wherein the L1 / L2 message comprises DCI scrambled in accordance with a radio network temporary identifier associated with the CSI reporting configuration for the LTM candidate cell, the DCI including a field that requests at least one CSI report.
[0208] Aspect 27: The method of any of Aspects 18-26, wherein the L1 / L2 message comprises a MAC-CE that activates a TCI state associated with the LTM candidate cell and requests transmission of at least one CSI report after initiating communication with the LTM candidate cell.
[0209] Aspect 28: The method of any of Aspects 18-27, wherein the L1 / L2 message comprises a cell switch command that triggers transmission of an aperiodic CSI report by the UE.
[0210] Aspect 29: The method of Aspect 28, wherein the aperiodic CSI report is transmitted via an uplink message associated with an earliest available uplink channel resource or configured grant resource following the L1 / L2 message.
[0211] Aspect 30: The method of Aspect 28, wherein the aperiodic CSI report is transmitted via a radio resource control message associated with completion of a reconfiguration procedure associated with the LTM candidate cell.
[0212] Aspect 31: 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 1-30.
[0213] Aspect 32: 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 1-30.
[0214] Aspect 33: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-30.
[0215] Aspect 34: 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 1-30.
[0216] Aspect 35: 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 1-30.
[0217] Aspect 36: 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 1-30.
[0218] Aspect 37: 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 1-30.
[0219] 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. No element, act, or instruction described herein should be construed as critical or essential unless explicitly described as such.
[0220] 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 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.
[0221] As used herein, the articles “a” and “an” are intended to refer to one or more items and may be used interchangeably with “one or more” or “at least one. ” 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 “a single one” or similar language is used. Also, as used herein, the terms “has, ” “have, ” “having, ” “comprise, ” “comprising, ” “include” and “including, ” and derivatives thereof or 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) . 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” ) . 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) .
[0222] As used herein, the term “determine” or “determining” encompasses a wide variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, estimating, investigating, looking up (such as via looking up in a table, a database, or another data structure) , searching, inferring, ascertaining, and / or measuring, among other possibilities. Also, “determining” can include receiving (such as receiving information) , accessing (such as accessing data stored in memory) or transmitting (such as transmitting information) , among other possibilities. Additionally, “determining” can include resolving, selecting, obtaining, choosing, establishing, and / or other such similar actions.
[0223] As used herein, the phrase “based on” is intended to mean “based at least in part on” or “based on or otherwise in association with” unless explicitly stated otherwise. As used herein, “satisfying a threshold” may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, or not equal to the threshold, among other examples.
[0224] Even though particular combinations of features are recited in the claims or disclosed in the specification, these combinations are not intended to limit the scope of all aspects described herein. 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.A user equipment (UE) for wireless communication, comprising:one or more memories; andone or more processors, coupled to the one or more memories, configured to cause the UE to:receive, from a network node, a Layer 1 or Layer 2 (L1 / L2) triggered mobility (LTM) configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a channel state information (CSI) reporting configuration for the LTM candidate cell;receive, from the network node, an L1 / L2 message associated with initiating communication with the LTM candidate cell; andtransmit at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message.2.The UE of claim 1, wherein the CSI reporting configuration indicates an uplink control channel configuration or a configured grant configuration associated with one or more uplink resources for transmission of the at least one CSI report.3.The UE of claim 1, wherein the L1 / L2 message is a cell switch command indicating whether CSI reporting is requested after the UE initiates communication with the LTM candidate cell.4.The UE of claim 3, wherein the at least one CSI report is transmitted by the UE based at least in part on reception of the cell switch command in accordance with the cell switch command indicating that CSI reporting is requested.5.The UE of claim 3, wherein the at least one CSI report is transmitted by the UE after completion of a reconfiguration procedure associated with the LTM candidate cell based at least in part on the cell switch command indicating that CSI reporting is not requested.6.The UE of claim 1, wherein the L1 / L2 message comprises a cell switch command, and the CSI reporting configuration includes a flag indicating that CSI reporting is activated by the cell switch command.7.The UE of claim 1, wherein the one or more processors are further configured to cause the UE to:update one or more CSI measurements associated with the LTM candidate cell prior to transmission of the at least one CSI report in accordance with the CSI reporting configuration, wherein the at least one CSI report is transmitted after receiving the L1 / L2 message, the L1 / L2 message comprising a cell switch command.8.The UE of claim 7, wherein the one or more processors are further configured to cause the UE to:transmit an acknowledgment message associated with the cell switch command, wherein the at least one CSI report is transmitted a duration after transmitting the acknowledgment message.9.The UE of claim 1, wherein the CSI reporting configuration includes at least one of a periodic CSI reporting configuration, a semi-persistent CSI reporting configuration, or an aperiodic CSI reporting configuration.10.The UE of claim 1, wherein the L1 / L2 message comprises downlink control information scrambled in accordance with a radio network temporary identifier associated with the CSI reporting configuration for the LTM candidate cell, the downlink control information including a field that requests the at least one CSI report.11.The UE of claim 10, wherein the one or more processors are further configured to cause the UE to:perform one or more CSI measurements associated with the LTM candidate cell prior to receiving a cell switch command associated with initiating communication with the LTM candidate cell based at least in part on the downlink control information.12.The UE of claim 10, wherein the one or more processors are further configured to cause the UE to:receive a cell switch command associated with initiating communication with the LTM candidate cell; andperform one or more CSI measurements associated with the LTM candidate cell after receiving the cell switch command and prior to transmitting an acknowledgment message associated with the cell switch command based at least in part on the downlink control information.13.The UE of claim 1, wherein the L1 / L2 message comprises a medium access control control element (MAC-CE) that activates a transmission configuration indication state associated with the LTM candidate cell and requests transmission of the at least one CSI report after the UE initiates communication with the LTM candidate cell.14.The UE of claim 1, wherein the at least one CSI report comprises an aperiodic CSI report transmitted after a cell switch command, and wherein the L1 / L2 message is the cell switch command.15.The UE of claim 14, wherein the aperiodic CSI report is transmitted via an uplink message associated with an earliest available uplink channel resource or configured grant resource following the L1 / L2 message.16.The UE of claim 14, wherein the aperiodic CSI report is transmitted via a radio resource control message associated with completion of a reconfiguration procedure associated with the LTM candidate cell.17.The UE of claim 1, wherein the one or more processors are further configured to cause the UE to:transmit a random access request message associated with initiating communication with the LTM candidate cell; andreceive an uplink grant based at least in part on the random access request message, wherein the at least one CSI report is transmitted via a resource scheduled by the uplink grant.18.A network node, comprising:one or more memories; andone or more processors, coupled to the one or more memories, configured to:transmit, to a user equipment (UE) , a Layer 1 or Layer 2 (L1 / L2) triggered mobility (LTM) configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a channel state information (CSI) reporting configuration for the LTM candidate cell; andtransmit, to the UE, an L1 / L2 message associated with initiating communication with the LTM candidate cell.19.The network node of claim 18, wherein the CSI reporting configuration indicates an uplink control channel configuration or a configured grant configuration associated with one or more uplink resources for transmission of at least one CSI report.20.The network node of claim 18, wherein the L1 / L2 message is a cell switch command indicating whether CSI reporting is requested after the UE initiates communication with the LTM candidate cell.21.The network node of claim 20, wherein transmitting the cell switch command triggers at least one CSI report to be transmitted by the UE based at least in part the cell switch command indicating that CSI reporting is requested.22.The network node of claim 20, wherein transmitting the cell switch command triggers at least one CSI report to be transmitted by the UE after completion of a reconfiguration procedure associated with the LTM candidate cell based at least in part on the cell switch command indicating that CSI reporting is not requested.23.The network node of claim 18, wherein the L1 / L2 message comprises a cell switch command, and the CSI reporting configuration includes a flag indicating that CSI reporting is activated by the cell switch command.24.The network node of claim 18, wherein the one or more processors are further configured to:receive, from the UE, an acknowledgment message associated with a cell switch command, the L1 / L2 message comprising the cell switch command, wherein at least one CSI report is transmitted a duration after receiving the acknowledgment message.25.The network node of claim 18, wherein the CSI reporting configuration includes at least one of a periodic CSI reporting configuration, a semi-persistent CSI reporting configuration, or an aperiodic CSI reporting configuration.26.The network node of claim 18, wherein the L1 / L2 message comprises downlink control information scrambled in accordance with a radio network temporary identifier associated with the CSI reporting configuration for the LTM candidate cell, the downlink control information including a field that requests at least one CSI report.27.The network node of claim 18, wherein the L1 / L2 message comprises a medium access control control element (MAC-CE) that activates a transmission configuration indication state associated with the LTM candidate cell and requests transmission of at least one CSI report after initiating communication with the LTM candidate cell.28.The network node of claim 18, wherein the L1 / L2 message comprises a cell switch command that triggers transmission of an aperiodic CSI report by the UE.29.A method of wireless communication performed by a user equipment (UE) , comprising:receiving, from a network node, a Layer 1 or Layer 2 (L1 / L2) triggered mobility (LTM) configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a channel state information (CSI) reporting configuration for the LTM candidate cell;receiving, from the network node, an L1 / L2 message associated with initiating communication with the LTM candidate cell; andtransmitting at least one CSI report in accordance with the CSI reporting configuration and the L1 / L2 message.30.A method of wireless communication performed by a network node, comprising:transmitting, to a user equipment (UE) , a Layer 1 or Layer 2 (L1 / L2) triggered mobility (LTM) configuration associated with a LTM candidate cell, wherein the LTM configuration indicates a channel state information (CSI) reporting configuration for the LTM candidate cell; andtransmitting, to the UE, an L1 / L2 message associated with initiating communication with the LTM candidate cell.