Two-part channel state information reporting based on assumed rank
By determining an assumed rank for CSI reporting, the UE optimizes CSI report transmission, addressing inefficiencies and conserving signaling resources in wireless communication systems.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- QUALCOMM INC
- Filing Date
- 2025-01-08
- Publication Date
- 2026-07-16
AI Technical Summary
Wireless communication systems face inefficiencies in channel state information (CSI) reporting due to the lack of information for determining when to provide a one-part or two-part CSI report, leading to wastage of signaling resources.
A user equipment (UE) determines an assumed rank based on the CSI configuration to decide whether to transmit a one-part or two-part CSI report, optimizing resource usage by aligning the report type with the actual rank.
This approach conserves signaling resources by ensuring appropriate selection of CSI report type, thereby enhancing resource efficiency in wireless communication.
Smart Images

Figure CN2025071203_16072026_PF_FP_ABST
Abstract
Description
TWO-PART CHANNEL STATE INFORMATION REPORTING BASED ON ASSUMED RANKFIELD OF THE DISCLOSURE
[0001] Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods associated with reporting channel state information based on an assumed rank.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.SUMMARY
[0004] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE) . The method may include receiving a channel state information (CSI) configuration for wideband CSI. The method may include determining an assumed rank based at least in part on the CSI configuration. The method may include measuring CSI using the CSI configuration. The method may include determining, based at least in part on the assumed rank, report channel information that includes one or more of a physical uplink control channel (PUCCH) resource, a quantity of physical resource blocks (PRBs) for the PUCCH resource, or a quantity of two-part CSI reports. The method may include transmitting a one-part CSI report or a two-part CSI report based at least in part on the report channel information.
[0005] Some aspects described herein relate to an apparatus for wireless communication at a UE. The apparatus may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to receive a CSI configuration for wideband CSI. The one or more processors may be configured to determine an assumed rank based at least in part on the CSI configuration. The one or more processors may be configured to measure CSI using the CSI configuration. The one or more processors may be configured to determine, based at least in part on the assumed rank, report channel information that includes one or more of a PUCCH resource, a quantity of PRBs for the PUCCH resource, or a quantity of two-part CSI reports. The one or more processors may be configured to transmit a one-part CSI report or a two-part CSI report based at least in part on the report channel information.
[0006] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive a CSI configuration for wideband CSI. The set of instructions, when executed by one or more processors of the UE, may cause the UE to determine an assumed rank based at least in part on the CSI configuration. The set of instructions, when executed by one or more processors of the UE, may cause the UE to measure CSI using the CSI configuration. The set of instructions, when executed by one or more processors of the UE, may cause the UE to determine, based at least in part on the assumed rank, report channel information that includes one or more of a PUCCH resource, a quantity of PRBs for the PUCCH resource, or a quantity of two-part CSI reports. The set of instructions, when executed by one or more processors of the UE, may cause the UE to transmit a one-part CSI report or a two-part CSI report based at least in part on the report channel information.
[0007] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving a CSI configuration for wideband CSI. The apparatus may include means for determining an assumed rank based at least in part on the CSI configuration. The apparatus may include means for measuring CSI using the CSI configuration. The apparatus may include means for determining, based at least in part on the assumed rank, report channel information that includes one or more of a PUCCH resource, a quantity of PRBs for the PUCCH resource, or a quantity of two-part CSI reports. The apparatus may include means for transmitting a one-part CSI report or a two-part CSI report based at least in part on the report channel information.
[0008] 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.
[0009] 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
[0010] 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.
[0011] Fig. 1 is a diagram illustrating an example of a wireless communication network, in accordance with the present disclosure.
[0012] Fig. 2 is a diagram illustrating an example disaggregated network node architecture, in accordance with the present disclosure.
[0013] Fig. 3A is a diagram illustrating examples of channel state information reference signal (CSI-RS) for a CSI report, or for beam management procedures, in accordance with the present disclosure.
[0014] Fig. 3B is a diagram illustrating examples of payload sizes and CSI reporting schemes, in accordance with the present disclosure.
[0015] Fig. 4 is a diagram illustrating an example associated with reporting CSI based on an assumed rank, in accordance with the present disclosure.
[0016] Fig. 5 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.
[0017] Fig. 6 is a diagram of an example apparatus for wireless communication, in accordance with the present disclosure.DETAILED DESCRIPTION
[0018] 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.
[0019] Several aspects of telecommunication systems will now be presented with reference to various methods, operations, apparatuses, and techniques. These methods, operations, apparatuses, and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, or algorithms (collectively referred to as “elements” ) . These elements may be implemented using hardware, software, or a combination of hardware and software. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.
[0020] A user equipment (UE) may measure reference signals received on a channel to report information about the channel in a channel state information (CSI) report. The CSI report may include a codebook, which is a set of precoders. A CSI report configuration may include a codebook configuration that includes a codebook type, such as Type-I single panel, Type-I multi-panel, Type-II single panel, Type-II port selection, or Type-II enhanced port selection. A Type-I codebook may include predefined matrices. A Type-II codebook may include a more detailed CSI report for multiple users and may include a group of beams. The codebook may include coefficients that are quantized values that represent the channel characteristics.
[0021] CSI may be reported in two parts, to help avoid blind decoding by the network entity. If reported on a physical uplink shared channel (PUSCH) , CSI part 1 may include a rank indicator (RI) , a CSI reference signal (CSI-RS) resource indicator (CRI) , and a channel quality indicator (CQI) (of the first codeword) , and CSI part 2 may include a precoding matrix indicator (PMI) , a CQI (of the second codeword (if RI > 4) ) , and a layer indicator (LI) . If reported on a physical uplink control channel (PUCCH) and if for wideband CSI (allowed for PUCCH format 2 / 3 / 4) , the wideband CSI may be reported as one part, and zero-padding may be used for the one-part CSI. If reporting is for a subband CSI (only allowed for long PUCCH format 3 / 4) , CSI part 1 and CSI part 2 on a PUCCH may include the same report quantities / indicators as for PUSCH.
[0022] For Type-I CSI, there may be different payload sizes with different ranks based on a co-phase (per-subband) . If a UE multiplexes CSI reports that include two-part CSI reports in a PUCCH resource, the UE may determine the PUCCH resource and a quantity of physical resource blocks (PRBs) for the PUCCH resource or a quantity of two-part CSI reports assuming that each of the CSI reports indicates rank 1. For Type-I CSI involving two-part subband CSI on a PUCCH, scheme A (limited CSI reporting, such as CQI and RI) assumes rank 1 or rank 8 (depending on an RI restriction) . Scheme B (more detailed CSI reporting that also includes PMI and more granular feedback) assumes rank 4. However, per-wideband CSI fields (e.g., PMI size) differ significantly for different rank values. The UE does not have information for determining when to provide a Type-I scheme A / scheme B two-part CSI report for wideband CSI. Without such information, the UE may waste signaling resources by providing a one-part CSI report when a two-part CSI report is more appropriate or providing a two-part CSI report when a one-part CSI report for wideband CSI is more appropriate. Such inefficiencies can waste signaling resources.
[0023] Various aspects relate generally to CSI reporting. Some aspects more specifically relate to a UE that determines an assumed rank based at least in part on a CSI configuration for wideband CSI. Since the actual rank is measured and reported (e.g., RI) , an assumed rank is differentiated from an actual measured and reported rank in that it is assumed that each of the CSI reports indicates a particular rank (e.g., rank 1) for an assumed total uplink control information (UCI) payload size to determine a PUCCH resource (and a quantity of PRBs for the PUCCH resource, or a quantity of two-part CSI reports) , while the actual measured and reported rank may result in a different total UCI payload size (typically smaller) than the assumed total UCI payload size. The UE may determine report channel information based at least in part on the assumed rank. The report channel information may include a PUCCH resource, a quantity of PRBs for the PUCCH resource, and / or a quantity of two-part CSI reports. The UE may transmit a one-part CSI report or a two-part CSI report for wideband CSI based at least in part on the report channel information. By determining the rank from the CSI configuration, and determining report channel information from the rank, the UE may determine to transmit a one-part CSI report or a two-part CSI report for wideband CSI.
[0024] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. By using rank and report channel information to determine whether to use a two-part CSI for wideband CSI, the UE may provide a two-part CSI report when appropriate to conserve signaling resources.
[0025] In some aspects, the UE may determine the rank based at least in part on one or more conditions. For example, a condition may include a rank restriction or a scheme configured by the CSI configuration, a quantity of CSI reports, or a PUCCH format.
[0026] 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.
[0027] 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.
[0028] 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.
[0029] 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.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] 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.
[0034] 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 with a communication manager 150 of the UE 120 or a processing system 145 with a communication manager 155 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.
[0035] 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.
[0036] 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) .
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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 medium access control (MAC) layer, and / or one or more higher physical (PHY) layers depending, at least in part, on a functional split, such as a functional split defined by the 3GPP. In some examples, a DU also may host 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.
[0041] 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) .
[0042] 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.
[0043] 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.
[0044] 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.
[0045] 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) .
[0046] 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 downlink control information (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.
[0047] 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 control element (MAC-CE) , an RRC message, or user data, among other examples. Each PDSCH may carry one or more transport blocks (TBs) of data.
[0048] 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 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) , an RI, and / or measurement information (for example, a layer 1 (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.
[0049] 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.
[0050] 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.
[0051] 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.
[0052] 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.
[0053] 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) .
[0054] 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 transmission configuration indicator (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.
[0055] 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.
[0056] 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.
[0057] In some aspects, a UE (e.g., a UE 120) may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may receive a CSI configuration for wideband CSI; determine an assumed rank based at least in part on the CSI configuration; measure CSI using the CSI configuration; determine, based at least in part on the assumed rank, report channel information that includes one or more of a PUCCH resource, a quantity of PRBs for the PUCCH resource, or a quantity of two-part CSI reports; and transmit a one-part CSI report or a two-part CSI report based at least in part on the report channel information. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
[0058] 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.
[0059] 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.
[0060] 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.
[0061] 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.
[0062] 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.
[0063] 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) .
[0064] 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 reporting CSI based on an assumed rank, 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 500 of Fig. 5, 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 500 of Fig. 5. In some examples, executing instructions may include running the instructions, converting the instructions, compiling the instructions, and / or interpreting the instructions, among other examples.
[0065] In some aspects, a UE (e.g., a UE 120) includes means for receiving a CSI configuration (e.g., using reception component 602 and communication manager 606) ; means for determining an assumed rank based at least in part on the CSI configuration for wideband CSI (e.g., using communication manager 606) ; means for measuring CSI using the CSI configuration (e.g., using reception component 602 and communication manager 606) ; means for determining, based at least in part on the assumed rank, report channel information that includes one or more of a PUCCH resource, a quantity of PRBs for the PUCCH resource, or a quantity of two-part CSI reports (e.g., using communication manager 606) ; and / or means for transmitting a one-part CSI report or a two-part CSI report based at least in part on the report channel information (e.g., using transmission component 604 and communication manager 606) . The means for the UE 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 602 depicted and described in connection with Fig. 6) , and / or a transmission component (for example, transmission component 604 depicted and described in connection with Fig. 6) , among other examples.
[0066] Fig. 3A is a diagram illustrating examples 300, 310, and 320 of CSI-RS for a CSI report, or for beam management procedures, in accordance with the present disclosure. As shown in Fig. 3A, examples 300, 310, and 320 include a UE 120 in communication with a network node 110 in a wireless network (e.g., wireless network 100) . However, the devices shown in Fig. 3A 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) .
[0067] As shown in Fig. 3A, 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. 3A 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) .
[0068] The first beam management procedure may include the network node 110 performing beam sweeping over multiple transmit (Tx) beams. The network node 110 may transmit a CSI-RS using each transmit beam for beam management. To enable the UE 120 to perform receive (Rx) beam sweeping, the network node may use a transmit beam to transmit (e.g., with repetitions) each CSI-RS at multiple times within the same reference signal (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 in a CSI report 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 synchronization signal blocks (SSBs) for beam management in a similar manner as described above.
[0069] As shown in Fig. 3A, 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. 3A 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.
[0070] As shown in Fig. 3A, 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. 3A 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) .
[0071] A CSI report may include a codebook, which is a set of precoders. A CSI report configuration may include a codebook configuration that includes a codebook type, such as Type-I single panel, Type-I multi-panel, Type-II single panel, Type-II port selection, or Type-II enhanced port selection. A Type-I codebook may include predefined matrices. A Type-II codebook may include a more detailed CSI report for multiple users and may include a group of beams. The codebook may include coefficients that are quantized values that represent the channel characteristics.
[0072] A codebook type may have an antenna configuration of Ng panels with dimensions N1 and N2. The codebook type may have a rank indicator (RI) restriction, or a limit on the quantity of layers. The CSI report configuration may be of a report configuration type (e.g., periodic, semi-persistent, aperiodic) . A full antenna configuration may include a 32-port CSI-RS resource and a codebook configuration where N1 = 4 and N2 = 4.
[0073] Type-I codebook enhancements may be used to support greater than 32 (e.g., 64, 128) CSI-RS ports. Time division duplexing (TDD) may expect CSI for a component carrier (CC) without uplink at, for example, 700 MHz. At 6 GHz, there can be 7 CCs. Furthermore, coherent joint transmission (CJT) CSI may define up to 128 ports. CJT may be used for PDSCH, where multiple TRPs transmit PDSCH communications coherently across different antennas of TRPs.
[0074] A Type-I codebook may include a spatial domain (SD) basis component. With MU-MIMO, two or more users in the same cell are co-scheduled on the same time-frequency resource. That is, two or more independent data streams are transmitted to different UEs at the same time, and the SD is used to separate the respective streams. By transmitting several streams simultaneously, the capacity of the system can be increased. The Type-1 codebook may involve a per-layer single SD basis.
[0075] A Type-1 codebook W1 may involve an orthogonal precoder across layers, via either orthogonal SD bases (orthogonal …, in W1) within a same orthogonal oversampling group index g∈ {0, 1, …, O1O2-1} , or a same SD basis with opposite co-phase where may be quadrature phase shift keying (QPSK) : 1 or j. This may be similar to a 2-port codebook for rank 2.
[0076] Another characteristic for a Type-I codebook may include an SD basis pattern. For rank 2, 3, and 4, the wideband for the UE may have 2 orthogonal SD bases, where the second SD basis may be selected (reported) from at most 4 orthogonal neighboring SD bases of the first SD basis (k1, k2) . For rank 5 to 8, the wideband for the UE may have orthogonal neighboring SD bases with a fixed SD basis pattern, such as 2 x 2 or 4 x 1 orthogonal neighbors. For rank 1 (or for the first SD basis of rank 2) , the wideband may have L = 4 non-orthogonal neighboring SD bases, where for each subband, selection is from the L = 4 non-orthogonal neighbors.
[0077] SD bases may be orthogonal between layers, via either orthogonal SD bases (orthogonal …, in W1) within a same oversampling group index g∈ {0, 1, …, O1O2-1} , or a same SD basis with opposite (orthogonal) co-phase between polarizations:
[0078] For rank 2, 3, and 4 and wideband 2 orthogonal SD bases, the second SD basis may be selected (reported) from at most 4 orthogonal neighboring SD bases of the 1st SD basis (k1, k2) . For rank 5 to 8 and wideband orthogonal neighboring SD bases with a fixed pattern, 2x2 or 4x1 orthogonal neighbors may be expressed as { (i1, 1, i1, 2) , (i1, 1+O1, i1, 2) , (i1, 1, i1, 2+O2) , (i1, 1+O1, i1, 2+O2) } (2x2) , or { (i1, 1, 0) , (i1, 1+O1, 0) , (i1, 1+2O1, 0) , (i1, 1+3O1, 0) } (4x1) .
[0079] A Type-1 codebook may include a co-phase “pattern” that is restricted as the same co-phase for more than one pair of layers. For example, for rank 4, 6 or 8, the first 4 layers (the first 2 layer-pairs) may be For rank 2, Co-phase can be wideband or per-subband.
[0080] Type-I codebook enhancements may involve SD basis selection. The first X strongest SD bases may be out of a total N1N2 (i.e., within an SD oversampling group –to ensure orthogonality between layers) , where each SD basis may be accounted as one layer ( “orphan” layer) , or accounted as a pair of two layers.
[0081] CSI may be reported in two parts, to help avoid blind decoding by the network entity. If reported on a PUSCH, CSI part 1 may include an RI, a CSI-RS resource indicator (CRI) , and a CQI (of the first codeword) , and CSI part 2 may include a precoding matrix indicator (PMI) , a CQI (of the second codeword (if RI > 4) ) , and a layer indicator (LI) . If reported on a PUCCH and if for wideband CSI (allowed for PUCCH format 2 / 3 / 4) , zero-padding may be used for CSI part 1. If reporting is for a subband CSI (only allowed for long PUCCH format 3 / 4) , CSI part 1 and CSI part 2 may include the same elements as for PUSCH.
[0082] The CSI payload size is not known by a network entity (e.g., gNB) before the measuring and reporting by the UE. For example, CSI with different rank (RI) values may have different payload sizes. Therefore, some rules are defined to avoid blind decoding at the network entity. If reported as a two-part CSI report, the CSI part one has a fixed payload size, and the CSI part two has a payload size that can be known by the network entity after decoding the CSI part one. If reported as a one-part CSI report, zero-padding may be needed to align a same payload size for different RIs. If reported on a PUCCH, and if wideband CSI (allowed for PUCCH format 2 / 3 / 4) is involved, the CSI report may use one part CSI with zero-padding. If subband CSI is involved (only allowed for long PUCCH format 3 / 4) , the CSI report may use a two part CSI. Part one may include an RI, a CRI, and a CQI (of the 1st codeword (CW) ) . Part two may include a PMI, a CQI (of the 2nd CW, if RI > 4) , and a layer indicator (LI) . If reported on a PUSCH, the CSI report may be a CSI two part report. Part one may include an RI, a CRI, and a CQI (of the 1st CW) . Part two may include a PMI, a CQI (of the 2nd CW, if RI > 4) , and an LI.
[0083] For HARQ feedback (or additionally multiplexed with other UCI) , the UE may be configured with up to 4 PUCCH resource sets, differentiated in UCI payload size. For set 1, OUCI ≤ 2 (up to 32 PUCCH resources within each set) . For set 2, 2 < OUCI ≤ N2 (up to 8 PUCCH resources within each set) . For set 3, N2 < OUCI ≤ N3 (up to 8 PUCCH resources within each set) . For set 4, N3 < OUCI ≤ 1706 (up to 8 PUCCH resources within each set) . The maximum payload size N2 and N3 for set 2 and set 3, respectively, are RRC-configured. The UCI comprises at least HARQ acknowledgment (ACK) / negative ACK (NACK) (A / N) feedback, and may also be multiplexed with an SR (scheduling request) and / or with CSI. When the UE determines a PUCCH resource to use, the UE may first determine the set based on the total UCI payload size (OUCI=OA / N+OSR+OCSI) , and then determine the PUCCH based on the DCI indicator (e.g., physical resource indicator (PRI) , PUCCH resource indicator) , which may include 3 bits in DCI for up to 8 PUCCHs within a set.
[0084] An assumed total UCI payload size may determine the quantity of PRBs for the PUCCH resource and the quantity of two-part CSI reports. CSI may be reported using a PUCCH format (PF) , such as PF2 (short PUCCH format, 1-2 symbols, ≤ 2 bits, 1 PRB) , PF3 (long PUCCH format, 4-14 symbols, > 2 bits, 1-6, 8-10, 12, 15, or 16 PRBs) , or PF4 (long PUCCH format, 4-14 symbols, > 2 bits, 1 PRB) .
[0085] The maximum code rate (e.g., maxCodeRate) of the PUCCH (for PF2, 3, or 4) may be maxCodeRate r∈ {0.08, 0.15, 0.25, 0.35, 0.45, 0.6, 0.8} , which is RRC-configured per PF. As for UCI omission, if UCI (CSI) is omitted according to CSI priority, until the maxCodeRate is satisfied: The UE may first omit two-part CSI reports, according to priority levels (each report is divided into three priority levels: wideband and odd / even subbands) . If the maxCodeRate is not satisfied after all of the two-part CSI reports are omitted, the UE may omit one-part CSI reports, report-by-report. The bandwidth (quantity of RBs) are adjusted according to UCI payload size (PF2 or 3) : If the UE selects the minimum quantity of PRBs satisfying are the quantity of REs for UCI in a PUCCH resource, and Qm is the modulation order.
[0086] In 3GPP Release 15, given that the main CSI is Type-I (UE mandatory, while Type-II is UE optional) , and given that Type-I CSI is designed as rank 1 being with the largest payload size for subband CSI, the UE assumes rank 1 payload size to determine a PUCCH resource (and a PUCCH set) . For Release 15 Type-I, there may be different payload sizes with different ranks based on a co-phase (per-subband) . Wideband payload sizes do not differ as much (up to a 2 bit difference) . By assuming the largest payload size, the determined PUCCH can guarantee reliability for smaller payload sizes. If a UE multiplexes CSI reports that include two-part CSI reports in a PUCCH resource, the UE may determine the PUCCH resource and a quantity of PRBs for the PUCCH resource or a quantity of two-part CSI reports assuming that each of the CSI reports indicates rank 1.
[0087] For Release 19 Type-I, for two-part subband CSI on a PUCCH, scheme A assumes rank 1 or rank 8 (depending on an RI restriction) . Scheme B assumes rank 4. Characteristics of scheme A and scheme B are shown by table 330 in Fig. 3B, for ranks 1-4 and ranks 5-8. However, per-wideband CSI fields (e.g., PMI and CQI size reported in CSI part 2) differ significantly for different rank values (although not as significantly as subband CSI, and an example of payload sizes is shown in table 340 of Fig. 3B) . For Release-19 Type-I, UCI part 2 wideband (WB) or wideband + subband (WB + SB) payload size assumes 128 ports: N1N2 = 64, and NSB is the quantity of subbands.
[0088] Two-part CSI may conserve overhead (signaling resources) . Otherwise, the zero-padding may consume too many bits. Zero-padding may increase with the quantity of reports on the PUCCH. There may be multiple reports on the PUCCH for carrier aggregation, since not all component carriers (CCs) in the uplink can have the PUCCH. Only a primary cell (PCell) and a PUCCH secondary cell (SCell) can have a PUCCH transmission. PUCCH-SCell is an optional UE feature. Without a PUCCH-SCell, the PCell-PUCCH may carry CSI for up to 32 CCs. With a PUCCH-SCell, each PUCCH group may comprise CSI for up to 16 CCs CSI.
[0089] However, the UE does not have information for determining when to provide a Type-I scheme A / scheme B two-part CSI report for wideband CSI. Without such information, the UE may waste signaling resources by providing a one-part CSI report when a two-part CSI report is more appropriate or providing a two-part CSI report when a one-part CSI report for wideband CSI is more appropriate. Such inefficiencies can waste signaling resources.
[0090] As indicated above, Figs. 3A and 3B are provided as an example of beam management procedures. Other examples of beam management procedures may differ from what is described with respect to Figs. 3A and 3B. 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.
[0091] Fig. 4 is a diagram illustrating an example 400 associated with reporting CSI based on an assumed rank, in accordance with the present disclosure. As shown in Fig. 4, a network entity 410 (e.g., network node 110) and a UE 420 (e.g., UE 120) may communicate with one another.
[0092] According to various aspects described herein, a UE may determine an assumed rank based at least in part on a CSI configuration for wideband CSI. Since the actual rank is measured and reported (e.g., RI) , an assumed rank is differentiated from an actual rank in that it is assumed that each of the CSI reports indicates a particular rank (e.g., rank 1) . The UE may determine report channel information based at least in part on the assumed rank. The report channel information may include a PUCCH resource, a quantity of PRBs for the PUCCH resource, and / or a quantity of two-part CSI reports. The UE may transmit a one-part CSI report or a two-part CSI report for wideband CSI based at least in part on the report channel information. By determining the rank from the CSI configuration, and determining report channel information from the rank, the UE may determine to transmit a one-part CSI report or a two-part CSI report for wideband CSI. By using rank and report channel information to determine whether to use a two-part CSI for wideband CSI, the UE may provide a two-part CSI report when appropriate to conserve signaling resources.
[0093] In some aspects, the UE may determine the rank based at least in part on one or more conditions. For example, a condition may include a rank restriction configured by the CSI configuration. The UE may determine the rank based at least in part on the rank restriction. In some aspects, if the quantity of Type-I CSI reports (Release 19 wideband CSI) on a same PUCCH resource is larger than a threshold (e.g., at least 2 reports, or 3, 4, 5, or more) , all of the corresponding Type-I CSI reports are reported as two-part CSI reports (otherwise all of the CSI reports are reported as one-part CSI reports with zero-padding) . The quantity of Type-I CSI reports may take into account a scheme A codebook with at least one of rank {5, 6, 7, 8} allowed by its associated rank restriction configuration or a scheme B codebook, but not a scheme A codebook without a rank {5, 6, 7, 8} allowed (since the CSI report is reported as a one-part CSI report) . If the number of Type-I CSI reports on a same PUCCH resource is small (e.g., only a single report) , the cost of zero-padding may be tolerable.
[0094] Assumed rank and report channel information determinations that are performed for wideband CSI are different than assumed rank and report channel information determinations that are performed for subband CSI. For each report, the payload size difference for different ranks is smaller for wideband CSI than for subband CSI (since for subband CSI, a contributor of the payload size difference is also subband co-phase, in addition to the payload size difference of wideband CSI, as shown in Table 340 of Fig. 3B) .
[0095] In some aspects, for a codebook scheme B, the wideband CSI may be reported as a two-part CSI report, and a UE-assumed rank (for the determination of a PUCCH resource and the quantity of PRBs of the PUCCH resource or two-part CSI reports) may be 4.
[0096] In some aspects, if rank values allowed by the associated rank restriction configuration include at least one of {5, 6, 7, 8} , the wideband CSI for a codebook scheme A may be reported as a two-part CSI report. Otherwise, a one-part CSI report may be used with zero-padding. When reported as a two-part CSI report, the UE-assumed rank (for a PUCCH resource and a quantity of PRBs of the PUCCH resource or part-two CSI reports) is 8.
[0097] In some aspects, wideband CSI may be reported as a two-part CSI report regardless of (independent of) a rank restriction configuration. When rank value (s) allowed by the associated rank restriction configuration allows at least one of {5, 6, 7, 8}, the UE-assumed rank (for a PUCCH resource and the quantity of PRBs of the PUCCH resource or two-part CSI reports) is 8. Otherwise, the UE-assumed rank may be 1 if the rank restriction does not allow rank 5, 6, 7, and 8.
[0098] In some scenarios, a PUCCH format 2 (short PUCCH format or PF2) may allow only wideband CSI reports, while PUCCH formats 3 and 4 (both are long PUCCH format) allows both wideband and subband CSI reports. Therefore, only player formats 3 and 4 already support two-part CSI reports, while PF2 only supports one-part CSI reports. That is, PF2 does not support two-part CSI reports. In some aspects, a Type-I wideband CSI on PF2 (short PUCCH format with 1 or 2 symbols) may be reported as a one-part CSI report.
[0099] Example 400 shows CSI configuration of the UE 420 for wideband CSI. As shown by reference number 425, the UE 420 may transmit a UE capability of transmitting Type-I CSI in a short PUCCH format (e.g., PF2) as the two-part CSI report. In some aspects, the Type-I CSI may be a wideband CSI on a PF2 as a two-part CSI report. In some aspects, the Type-I CSI may be a subband CSI on a PF2 as a two-part CSI report.
[0100] As shown by reference number 430, the network entity 410 may transmit a CSI configuration. The CSI configuration may include information associated with determining an assumed rank (e.g., rank restriction) . As shown by reference number 435, the UE 420 may determine an assumed rank based at least in part on the CSI configuration (e.g., rank restriction, codebook scheme, quantity of CSI reports, a PUCCH format) .
[0101] As shown by reference number 440, the network entity 410 may transmit reference signals (e.g., CSI-RS, SSB) . As shown by reference number 445, the UE 420 may measure CSI based at least in part on the reference signals, to generate a CSI report.
[0102] As shown by reference number 450, the UE 420 may determine report channel information based at least in part on the assumed rank. As shown by reference number 455, the UE 420 may transmit a CSI report that is either a one-part CSI report or a two-part CSI report, based at least in part on the report channel information (e.g., a PUCCH resource, a quantity of PRBs, and / or a quantity of two-part CSI reports) . For example, the UE 420 may transmit a two-part CSI report for wideband CSI based on a condition, such as a rank restriction, a codebook scheme (scheme A or scheme B) , a quantity of CSI reports of Type-I (e.g., for different CCs) , and / or PUCCH format (of the PUCCH resource to convey the CSI) . As a result, the UE 420 may transmit a two-part CSI report for wideband CSI when appropriate to conserve signaling resources.
[0103] As indicated above, Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.
[0104] Fig. 5 is a diagram illustrating an example process 500 performed, for example, at a UE or an apparatus of a UE, in accordance with the present disclosure. Example process 500 is an example where the apparatus or the UE (e.g., UE 420) performs operations associated with two-part CSI reporting based on an assumed rank.
[0105] As shown in Fig. 5, in some aspects, process 500 may include receiving a CSI configuration for wideband CSI (block 510) . For example, the UE (e.g., using reception component 602 and / or communication manager 606, depicted in Fig. 6) may receive a CSI configuration for wideband CSI, as described above.
[0106] As further shown in Fig. 5, in some aspects, process 500 may include determining an assumed rank based at least in part on the CSI configuration (block 520) . For example, the UE (e.g., using communication manager 606, depicted in Fig. 6) may determine an assumed rank based at least in part on the CSI configuration, as described above.
[0107] As further shown in Fig. 5, in some aspects, process 500 may include measuring CSI using the CSI configuration (block 530) . For example, the UE (e.g., using communication manager 606, depicted in Fig. 6) may measure CSI using the CSI configuration, as described above.
[0108] As further shown in Fig. 5, in some aspects, process 500 may include determining, based at least in part on the assumed rank, report channel information that includes one or more of a PUCCH resource, a quantity of PRBs for the PUCCH resource, or a quantity of two-part CSI reports (block 540) . For example, the UE (e.g., using communication manager 606, depicted in Fig. 6) may determine, based at least in part on the assumed rank, report channel information that includes one or more of a PUCCH resource, a quantity of PRBs for the PUCCH resource, or a quantity of two-part CSI reports, as described above.
[0109] As further shown in Fig. 5, in some aspects, process 500 may include transmitting a one-part CSI report or a two-part CSI report based at least in part on the report channel information (block 550) . For example, the UE (e.g., using transmission component 604 and / or communication manager 606, depicted in Fig. 6) may transmit a one-part CSI report or a two-part CSI report based at least in part on the report channel information, as described above.
[0110] Process 500 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.
[0111] In a first aspect, determining the assumed rank based at least in part on the CSI configuration includes determining the assumed rank based at least in part on a rank restriction indicated by the CSI configuration.
[0112] In a second aspect, alone or in combination with the first aspect, determining the assumed the rank based at least in part on the CSI configuration includes determining the assumed rank based at least in part on a codebook scheme indicated by the CSI configuration.
[0113] In a third aspect, alone or in combination with one or more of the first and second aspects, determining the assumed rank based at least in part on the CSI configuration includes determining the assumed rank based at least in part on a quantity of CSI reports indicated by the CSI configuration.
[0114] In a fourth aspect, alone or in combination with one or more of the first through third aspects, determining the assumed rank based at least in part on the CSI configuration includes determining the assumed rank based at least in part on a PUCCH format indicated by the CSI configuration.
[0115] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, transmitting the one-part CSI report or the two-part CSI report includes transmitting, for codebook scheme A, the two-part CSI report based at least in part on a rank restriction allowing 5, 6, 7, or 8.
[0116] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the assumed rank is 8.
[0117] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, transmitting the one-part CSI report or the two-part CSI report includes transmitting, for codebook scheme B, the two-part CSI report based at least in part on the assumed rank being 4.
[0118] In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, transmitting the one-part CSI report or the two-part CSI report includes transmitting, for codebook scheme A, the two-part CSI part report independent of a rank restriction in the CSI configuration.
[0119] In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the assumed rank is 8 based at least in part on the rank restriction allowing rank 5, 6, 7, or 8, and wherein the assumed rank is 1 based at least in part on the rank restriction not allowing rank 5, 6, 7, and 8.
[0120] In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, transmitting the one-part CSI report or the two-part CSI report includes transmitting the two-part CSI report based at least in part on a quantity of Type I CSI reports on a same PUCCH resource satisfying a threshold.
[0121] In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, transmitting the one-part CSI report or the two-part CSI report includes transmitting the one-part CSI report based at least in part on a short PUCCH format indicated in the CSI configuration.
[0122] In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, process 500 includes transmitting a UE capability of transmitting Type-I wideband CSI in a short PUCCH format as the two-part CSI report.
[0123] In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, process 500 includes transmitting a UE capability of transmitting Type-I subband CSI in a short PUCCH format as the two-part CSI report.
[0124] Although Fig. 5 shows example blocks of process 500, in some aspects, process 500 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 5. Additionally, or alternatively, two or more of the blocks of process 500 may be performed in parallel.
[0125] Fig. 6 is a diagram of an example apparatus 600 for wireless communication, in accordance with the present disclosure. The apparatus 600 may be a UE, or a UE may include the apparatus 600. In some aspects, the apparatus 600 includes a reception component 602, a transmission component 604, and / or a communication manager 606, 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 606 is the communication manager 150 described in connection with Fig. 1. As shown, the apparatus 600 may communicate with another apparatus 608, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 602 and the transmission component 604. The communication manager 606 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.
[0126] In some aspects, the apparatus 600 may be configured to perform one or more operations described herein in connection with Figs. 1-4. Additionally, or alternatively, the apparatus 600 may be configured to perform one or more processes described herein, such as process 500 of Fig. 5. In some aspects, the apparatus 600 and / or one or more components shown in Fig. 6 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. 6 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.
[0127] The reception component 602 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 608. The reception component 602 may provide received communications to one or more other components of the apparatus 600. In some aspects, the reception component 602 may perform signal processing on the received communications, and may provide the processed signals to the one or more other components of the apparatus 600. In some aspects, the reception component 602 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.
[0128] The transmission component 604 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 608. In some aspects, one or more other components of the apparatus 600 may generate communications and may provide the generated communications to the transmission component 604 for transmission to the apparatus 608. In some aspects, the transmission component 604 may perform signal processing on the generated communications, and may transmit the processed signals to the apparatus 608. In some aspects, the transmission component 604 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 604 may be co-located with the reception component 602.
[0129] The communication manager 606 may support operations of the reception component 602 and / or the transmission component 604. For example, the communication manager 606 may receive information associated with configuring reception of communications by the reception component 602 and / or transmission of communications by the transmission component 604. Additionally, or alternatively, the communication manager 606 may generate and / or provide control information to the reception component 602 and / or the transmission component 604 to control reception and / or transmission of communications.
[0130] The reception component 602 may receive a CSI configuration for wideband CSI. The communication manager 606 may determine an assumed rank based at least in part on the CSI configuration. The communication manager 606 may measure CSI using the CSI configuration. The communication manager 606 may determine, based at least in part on the assumed rank, report channel information that includes one or more of a PUCCH resource, a quantity of PRBs for the PUCCH resource, or a quantity of two-part CSI reports. The transmission component 604 may transmit a one-part CSI report or a two-part CSI report based at least in part on the report channel information.
[0131] The transmission component 604 may transmit a UE capability of transmitting Type-I wideband CSI in a short PUCCH format as the two-part CSI report. The transmission component 604 may transmit a UE capability of transmitting Type-I subband CSI in a short PUCCH format as the two-part CSI report.
[0132] The number and arrangement of components shown in Fig. 6 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. 6. Furthermore, two or more components shown in Fig. 6 may be implemented within a single component, or a single component shown in Fig. 6 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 6 may perform one or more functions described as being performed by another set of components shown in Fig. 6.
[0133] The following provides an overview of some Aspects of the present disclosure:
[0134] Aspect 1: A method of wireless communication performed by a user equipment (UE) , comprising: receiving a channel state information (CSI) configuration for wideband CSI; determining an assumed rank based at least in part on the CSI configuration; measuring CSI using the CSI configuration; determining, based at least in part on the assumed rank, report channel information that includes one or more of a physical uplink control channel (PUCCH) resource, a quantity of physical resource blocks for the PUCCH resource, or a quantity of two-part CSI reports; and transmitting a one-part CSI report or a two-part CSI report based at least in part on the report channel information.
[0135] Aspect 2: The method of Aspect 1, wherein determining the assumed rank based at least in part on the CSI configuration includes determining the assumed rank based at least in part on a rank restriction indicated by the CSI configuration.
[0136] Aspect 3: The method of any of Aspects 1-2, wherein determining the assumed the rank based at least in part on the CSI configuration includes determining the assumed rank based at least in part on a codebook scheme indicated by the CSI configuration.
[0137] Aspect 4: The method of any of Aspects 1-3, wherein determining the assumed rank based at least in part on the CSI configuration includes determining the assumed rank based at least in part on a quantity of CSI reports indicated by the CSI configuration.
[0138] Aspect 5: The method of any of Aspects 1-4, wherein determining the assumed rank based at least in part on the CSI configuration includes determining the assumed rank based at least in part on a PUCCH format indicated by the CSI configuration.
[0139] Aspect 6: The method of any of Aspects 1-5, wherein transmitting the one-part CSI report or the two-part CSI report includes transmitting, for codebook scheme A, the two-part CSI report based at least in part on a rank restriction allowing 5, 6, 7, or 8.
[0140] Aspect 7: The method of Aspect 6, wherein the assumed rank is 8.
[0141] Aspect 8: The method of any of Aspects 1-5, wherein transmitting the one-part CSI report or the two-part CSI report includes transmitting, for codebook scheme B, the two-part CSI report based at least in part on the assumed rank being 4.
[0142] Aspect 9: The method of any of Aspects 1-5, wherein transmitting the one-part CSI report or the two-part CSI report includes transmitting, for codebook scheme A, the two-part CSI part report independent of a rank restriction in the CSI configuration.
[0143] Aspect 10: The method of Aspect 9, wherein the assumed rank is 8 based at least in part on the rank restriction allowing rank 5, 6, 7, or 8, and wherein the assumed rank is 1 based at least in part on the rank restriction not allowing rank 5, 6, 7, and 8.
[0144] Aspect 11: The method of any of Aspects 1-10, wherein transmitting the one-part CSI report or the two-part CSI report includes transmitting the two-part CSI report based at least in part on a quantity of Type I CSI reports on a same PUCCH resource satisfying a threshold.
[0145] Aspect 12: The method of any of Aspects 1-10, wherein transmitting the one-part CSI report or the two-part CSI report includes transmitting the one-part CSI report based at least in part on a short PUCCH format indicated in the CSI configuration.
[0146] Aspect 13: The method of any of Aspects 1-12, further comprising transmitting a UE capability of transmitting Type-I wideband CSI in a short PUCCH format as the two-part CSI report.
[0147] Aspect 14: The method of any of Aspects 1-12, further comprising transmitting a UE capability of transmitting Type-I subband CSI in a short PUCCH format as the two-part CSI report.
[0148] Aspect 15: An apparatus for wireless communication at a device, the apparatus comprising one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to perform the method of one or more of Aspects 1-14.
[0149] Aspect 16: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors configured to cause the device to perform the method of one or more of Aspects 1-14.
[0150] Aspect 17: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-14.
[0151] Aspect 18: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform the method of one or more of Aspects 1-14.
[0152] Aspect 19: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-14.
[0153] Aspect 20: A device for wireless communication, the device comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-14.
[0154] Aspect 21: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 1-14.
[0155] 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.
[0156] 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.
[0157] 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 “asingle 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) .
[0158] 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.
[0159] 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.
[0160] 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.An apparatus for wireless communication at a user equipment (UE) , comprising:one or more memories; andone or more processors, coupled to the one or more memories, individually or collectively configured to cause the UE to:receive a channel state information (CSI) configuration for wideband CSI;determine an assumed rank based at least in part on the CSI configuration;measure CSI using the CSI configuration;determine, based at least in part on the assumed rank, report channel information that includes one or more of a physical uplink control channel (PUCCH) resource, a quantity of physical resource blocks for the PUCCH resource, or a quantity of two-part CSI reports; andtransmit a one-part CSI report or a two-part CSI report based at least in part on the report channel information.2.The apparatus of claim 1, wherein to determine the assumed rank based at least in part on the CSI configuration, the one or more processors are individually or collectively configured to cause the UE to determine the assumed rank based at least in part on a rank restriction indicated by the CSI configuration, a codebook scheme indicated by the CSI configuration, a quantity of CSI reports indicated by the CSI configuration, a PUCCH format indicated by the CSI configuration, or a combination thereof.3.The apparatus of claim 1, wherein to transmit the one-part CSI report or the two-part CSI report, the one or more processors are individually or collectively configured to cause the UE to transmit, for codebook scheme A, the two-part CSI report based at least in part on a rank restriction allowing 5, 6, 7, or 8.4.The apparatus of claim 3, wherein the assumed rank is 8.5.The apparatus of claim 1, wherein to transmit the one-part CSI report or the two-part CSI report, the one or more processors are individually or collectively configured to cause the UE to transmit, for codebook scheme B, the two-part CSI report based at least in part on the assumed rank being 4.6.The apparatus of claim 1, wherein to transmit the one-part CSI report or the two-part CSI report, the one or more processors are individually or collectively configured to cause the UE to transmit, for codebook scheme A, the two-part CSI part report independent of a rank restriction in the CSI configuration.7.The apparatus of claim 6, wherein the assumed rank is 8 based at least in part on the rank restriction allowing rank 5, 6, 7, or 8, and wherein the assumed rank is 1 based at least in part on the rank restriction not allowing rank 5, 6, 7, and 8.8.The apparatus of claim 1, wherein to transmit the one-part CSI report or the two-part CSI report, the one or more processors are individually or collectively configured to cause the UE to transmit the two-part CSI report based at least in part on a quantity of Type I CSI reports on a same PUCCH resource satisfying a threshold.9.The apparatus of claim 1, wherein to transmit the one-part CSI report or the two-part CSI report, the one or more processors are individually or collectively configured to cause the UE to transmit the one-part CSI report based at least in part on a short PUCCH format indicated in the CSI configuration.10.The apparatus of claim 1, wherein the one or more processors are individually or collectively configured to cause the UE to transmit a UE capability of transmitting Type-I wideband CSI in a short PUCCH format as the two-part CSI report.11.The apparatus of claim 1, wherein the one or more processors are individually or collectively configured to cause the UE to transmit a UE capability of transmitting Type-I subband CSI in a short PUCCH format as the two-part CSI report.12.A method of wireless communication performed by a user equipment (UE) , comprising:receiving a channel state information (CSI) configuration for wideband CSI;determining an assumed rank based at least in part on the CSI configuration;measuring CSI using the CSI configuration;determining, based at least in part on the assumed rank, report channel information that includes one or more of a physical uplink control channel (PUCCH) resource, a quantity of physical resource blocks for the PUCCH resource, or a quantity of two-part CSI reports; andtransmitting a one-part CSI report or a two-part CSI report based at least in part on the report channel information.13.The method of claim 12, wherein determining the assumed rank based at least in part on the CSI configuration includes determining the assumed rank based at least in part on a rank restriction indicated by the CSI configuration, a codebook scheme indicated by the CSI configuration, a quantity of CSI reports indicated by the CSI configuration, a PUCCH format indicated by the CSI configuration, or a combination thereof.14.The method of claim 12, wherein transmitting the one-part CSI report or the two-part CSI report includes transmitting, for codebook scheme A, the two-part CSI report based at least in part on a rank restriction allowing 5, 6, 7, or 8.15.The method of claim 12, wherein transmitting the one-part CSI report or the two-part CSI report includes transmitting, for codebook scheme B, the two-part CSI report based at least in part on the assumed rank being 4.16.The method of claim 12, wherein transmitting the one-part CSI report or the two-part CSI report includes transmitting, for codebook scheme A, the two-part CSI part report independent of a rank restriction in the CSI configuration.17.The method of claim 12, further comprising transmitting a UE capability of transmitting Type-I wideband CSI in a short PUCCH format as the two-part CSI report.18.An apparatus for wireless communication, comprising:means for receiving a channel state information (CSI) configuration for wideband CSI;means for determining an assumed rank based at least in part on the CSI configuration;means for measuring CSI using the CSI configuration;means for determining, based at least in part on the assumed rank, report channel information that includes one or more of a physical uplink control channel (PUCCH) resource, a quantity of physical resource blocks for the PUCCH resource, or a quantity of two-part CSI reports; andmeans for transmitting a one-part CSI report or a two-part CSI report based at least in part on the report channel information.19.The apparatus of claim 18, wherein the means for determining the assumed rank based at least in part on the CSI configuration includes means for determining the assumed rank based at least in part on a rank restriction indicated by the CSI configuration, a codebook scheme indicated by the CSI configuration, a quantity of CSI reports indicated by the CSI configuration, a PUCCH format indicated by the CSI configuration, or a combination thereof.20.The apparatus of claim 18, further comprising means for transmitting a UE capability of transmitting Type-I wideband CSI in a short PUCCH format as the two-part CSI report.