Triggering frequency dependent subband impairment estimation at user equipment (UE)

Abstract

A method for wireless communication at a user equipment (UE) includes receiving a second message from a network node, the second message including a command to update a current frequency dependent sub-band impairment estimate or a command to maintain the current frequency dependent sub-band impairment estimate. The method also includes cancelling frequency dependent subband impairments as a function of receiving the second message. The cancellation may be based on the second message including the command for maintaining the current frequency dependent sub-band impairment estimate, then the current frequency dependent sub-band impairment estimate, or based on the second message including the command for updating the current frequency dependent sub-band impairment estimate, then the current frequency dependent sub-band impairment estimate. If so, updating the current frequency related sub-band damage estimation.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Patent Application No. 18 / 456,448, filed August 25, 2023, entitled “TRIGGERING A FREQUENCY-DEPENDENT SUBBAND ​​IMPAIRMENT ESTIMATE AT A USER EQUIPMENT (UE),” the entire disclosure of which is expressly incorporated herein by reference. Technical Field

[0003] This disclosure relates generally to wireless communications, and more specifically to frequency-dependent subband impairment estimation triggered by network nodes at user equipment (UE). Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is an enhancement set of the Universal Mobile Telecommunications System (UMTS) mobile standard released by the 3rd Generation Partnership Project (3GPP). Narrowband (NB) Internet of Things (IoT) and Enhanced Machine-Type Communications (eMTC) are enhancement sets of LTE for machine-type communications.

[0005] A wireless communication network may include multiple base stations (BSs) capable of supporting communication for multiple user equipment (UEs). UEs can communicate with the base stations (BSs) via downlinks and uplinks. A downlink (or forward link) refers to the communication link from the BS to the UE, and an uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail, a BS may be referred to as a Node B, Evolved Node B (eNB), gNB, Access Point (AP), Radio Headend, Transmit and Receive Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols to enable different wireless devices to communicate on a municipal, national, regional, and even global level. New Radio (NR), which can also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP- OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple input multiple output (MIMO) antenna technology, and carrier aggregation.

[0007] Mismatches between in-phase (I) and quadrature (Q) components of a signal can cause frequency-dependent subband impairment, such as frequency-dependent residual sideband (FDSBS). Frequency-dependent subband impairment can interfere with wireless communications, and the interference can increase as carrier frequency increases. Additionally, frequency-dependent subband impairment can increase as the number of transmit antennas at a network node increases. In some cases, a network node can attempt to maintain the impairment level of the frequency-dependent subband impairment below an impairment threshold to enable transmission of low-order quadrature amplitude modulation (QAM) symbols. Additionally or alternatively, a receiver, such as a user equipment (UE), can attempt to estimate and cancel or reduce the frequency-dependent subband impairment. SUMMARY

[0008] In some aspects of the disclosure, a method for wireless communication by a user equipment (UE) includes receiving, from a network node, a first message including a command to update a current frequency-dependent subband impairment estimate or a command to maintain the current frequency-dependent subband impairment estimate. The method further includes canceling the frequency-dependent subband impairment in accordance with receiving the first message. The canceling can be in accordance with the current frequency-dependent subband impairment estimate in accordance with the first message including the command to maintain the current frequency-dependent subband impairment estimate, or an update to the current frequency-dependent subband impairment estimate in accordance with the first message including the command to update the current frequency-dependent subband impairment estimate.

[0009] Some other aspects of the disclosure relate to an apparatus comprising means for receiving a first message from a network node, the first message comprising a command to update a current frequency-dependent subband impairment estimate or a command to maintain the current frequency-dependent subband impairment estimate. The apparatus further comprises means for canceling a frequency-dependent subband impairment in accordance with receiving the first message. The canceling can be of the current frequency-dependent subband impairment estimate in accordance with the first message comprising the command to maintain the current frequency-dependent subband impairment estimate or an update to the current frequency-dependent subband impairment estimate in accordance with the first message comprising the command to update the current frequency-dependent subband impairment estimate.

[0010] In some other aspects of the disclosure, a non-transitory computer-readable medium having non-transitory program code recorded thereon is disclosed. The program code is executed by one or more processors and comprises program code to receive a first message from a network node, the first message comprising a command to update a current frequency-dependent subband impairment in accordance with receiving the first message. The program code further comprises program code to cancel a frequency-dependent subband impairment in accordance with receiving the first message. The canceling can be of the current frequency-dependent subband impairment estimate in accordance with the first message comprising the command to maintain the current frequency-dependent subband impairment estimate or an update to the current frequency-dependent subband impairment estimate in accordance with the first message comprising the command to update the current frequency-dependent subband impairment estimate.

[0011] Some other aspects of the disclosure relate to a UE comprising one or more processors and one or more memories coupled with the one or more processors and storing processor-executable code that, when executed by the one or more processors, is configured to cause the UE to receive a first message from a network node, the first message comprising a command to update a current frequency-dependent subband impairment estimate or a command to maintain the current frequency-dependent subband impairment estimate. Execution of the processor-executable code further causes the UE to cancel a frequency-dependent subband impairment in accordance with receiving the first message. The canceling can be of the current frequency-dependent subband impairment estimate in accordance with the first message comprising the command to maintain the current frequency-dependent subband impairment estimate or an update to the current frequency-dependent subband impairment estimate in accordance with the first message comprising the command to update the current frequency-dependent subband impairment estimate.

[0012] In some aspects of the disclosure, a method for wireless communication by a network node includes ascertaining a rate of change associated with a frequency-dependent subband impairment. The method also includes receiving a first message indicating a capability of a UE to cancel the frequency-dependent subband impairment. The method further includes transmitting, from the network node, a second message indicating a command for updating or maintaining a current frequency-dependent subband impairment estimate in accordance with the rate of change and the UE being capable of canceling the frequency-dependent subband impairment.

[0013] Some other aspects of the disclosure relate to an apparatus that includes means for ascertaining a rate of change associated with a frequency-dependent subband impairment. The apparatus also includes means for receiving a first message indicating a capability of a UE to cancel the frequency-dependent subband impairment. The apparatus further includes means for transmitting, from the network node, a second message indicating a command for updating or maintaining a current frequency-dependent subband impairment estimate in accordance with the rate of change and the UE being capable of canceling the frequency-dependent subband impairment.

[0014] In some other aspects of the disclosure, a non-transitory computer-readable medium having non-transitory program code recorded thereon is disclosed. The program code is executed by one or more processors and includes program code to ascertain a rate of change associated with a frequency-dependent subband impairment. The program code also includes program code to receive a first message indicating a capability of a UE to cancel the frequency-dependent subband impairment. The program code further includes program code to transmit, from the network node, a second message indicating a command for updating or maintaining a current frequency-dependent subband impairment estimate in accordance with the rate of change and the UE being capable of canceling the frequency-dependent subband impairment.

[0015] Some other aspects of the disclosure relate to a network node including one or more processors and one or more memories coupled with the one or more processors and storing processor-executable code that, when executed by the one or more processors, is configured to cause the network node to ascertain a rate of change associated with a frequency-dependent subband impairment. Execution of the processor-executable code further causes the network node to receive a first message indicating a capability of a UE to cancel the frequency-dependent subband impairment. Execution of the processor-executable code further causes the network node to transmit, from the network node, a second message indicating a command for updating or maintaining a current frequency-dependent subband impairment estimate in accordance with the rate of change and the UE being capable of canceling the frequency-dependent subband impairment.

[0016] Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and processing system as substantially described with reference to the attached drawings and as illustrated in the accompanying drawings and specification.

[0017] The features and technical advantages of the examples according to this disclosure have been summarized rather extensively above in order to better understand the detailed description that follows. Additional features and advantages will be described. The disclosed concepts and specific examples can be readily utilized as the basis for modifying or designing other structures for achieving the same purpose of this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the disclosed concepts, in both their organization and manner of operation, and the associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each drawing in the accompanying drawings is for illustrative and descriptive purposes and not as a limitation of the definitions in the claims. Attached Figure Description

[0018] To gain a detailed understanding of the features of this disclosure, reference can be made to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain aspects of this disclosure and should therefore not be considered as limiting its scope, as the description may allow for other equivalent aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0019] Figure 1 It is a block diagram that conceptually illustrates examples of wireless communication networks according to various aspects of this disclosure.

[0020] Figure 2 This is a block diagram that conceptually illustrates examples of communication between a base station and a user equipment (UE) in a wireless communication network according to various aspects of this disclosure.

[0021] Figure 3 This is a block diagram illustrating an example decomposed base station architecture according to various aspects of this disclosure.

[0022] Figure 4 This is a timing diagram illustrating examples of frequency-dependent subband damage estimation according to various aspects of this disclosure.

[0023] Figure 5 This is a block diagram illustrating an example wireless communication device that selectively updates frequency-dependent subband impairment estimates in support of various aspects of this disclosure.

[0024] Figure 6 This is a flowchart illustrating examples of a process for selectively updating frequency-dependent subband impairment estimates by a UE, according to various aspects of this disclosure.

[0025] Figure 7 This is a block diagram illustrating an example wireless communication device that selectively commands a UE to update frequency-dependent subband impairment estimates in accordance with various aspects of this disclosure.

[0026] Figure 8This is a flowchart illustrating examples of processes performed by a network device according to various aspects of this disclosure. Detailed Implementation

[0027] Various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any particular structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be comprehensive and complete, and will fully convey the scope of this disclosure to those skilled in the art. Based on the teachings, those skilled in the art will recognize that the scope of this disclosure is intended to cover any aspect of this disclosure, whether implemented independently of or in combination with any other aspect of this disclosure. For example, an apparatus or method may be implemented using any number of the aspects set forth. Furthermore, the scope of this disclosure is intended to cover such apparatus or methods practiced using other structures, functions, or structures and functions other than or supplementing the various aspects of this disclosure set forth. It should be understood that any aspect of this disclosure may be embodied by one or more elements of the claims.

[0028] Various devices and techniques will now be used to illustrate several aspects of a telecommunications system. These devices and techniques will be described in detail below and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, “elements”). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the system as a whole.

[0029] It should be noted that while the aspects may be described using terms commonly associated with 5G and subsequent wireless technologies, the aspects of this disclosure may be applied in communication systems based on other generations, such as and including 3G, 4G and / or 6G technologies.

[0030] A mismatch between the in-phase (I) and quadrature (Q) components of a signal (“I / Q mismatch”) can cause a portion of the signal to leak into sidebands or subbands, resulting in residual bandwidth. Residual bandwidth can be an example of frequency-dependent subband impairment, such as frequency-dependent residual sidebands (FDSBS). In some cases, I / Q mismatch can vary based on the signal frequency, thus the subband impairment can be frequency-dependent. In some cases, frequency-dependent subband impairment can interfere with downlink signals, causing distortion or interference that can degrade the quality of wireless communication. In some such cases, interference may increase with increasing carrier frequency. Frequency-dependent subband impairment can also increase with increasing number of transmitting antennas at network nodes. In some examples, network nodes may attempt to maintain frequency-dependent subband impairment below an impairment threshold to enable the transmission of low-order quadrature amplitude modulation (QAM) symbols. Additionally or alternatively, receivers such as user equipment (UE) may attempt to estimate and eliminate or reduce frequency-dependent subband impairment. In some cases, UEs can eliminate or reduce frequency-dependent subband impairments to enable super-QAM transmission (e.g., up to 16,000 QAM).

[0031] The process for eliminating or reducing frequency-dependent subband impairments, such as I / Q mismatch, can begin with the UE estimating the frequency-dependent subband impairments based on measurements performed on one or more pilot signals. The UE can then eliminate or reduce the estimated frequency-dependent subband impairments from subsequently received downlink signals. In conventional systems, the UE can estimate the frequency-dependent subband impairments within each downlink time slot. However, estimating the frequency-dependent subband impairments at each downlink time slot across multiple downlink time slots can increase resource usage at the UE to levels exceeding acceptable levels. In most cases, frequency-dependent subband impairments may change little over consecutive time slots, making per-slot estimation unnecessary, redundant, and / or avoidable. As an example, frequency-dependent subband impairments can change once per second, making them constant across up to 8,000 time slots based on millimeter-wave (mmWave) parameter sets. In these cases, estimating the frequency-dependent subband impairments using only one of the 8,000 time slots eliminates 7,999 unnecessary estimates.

[0032] Various aspects of this disclosure relate to reducing (e.g., minimizing) the frequency-dependent subband impairment estimation rate. In some examples, a network node may receive from a UE a first message instructing the UE to eliminate frequency-dependent subband impairment. The network node may then selectively command the UE to update the current frequency-dependent subband impairment estimate. For example, in each of a set of time slots, the network node may send a corresponding second message instructing either a command to maintain the corresponding current frequency-dependent subband impairment estimate or a command to update the current frequency-dependent subband impairment estimate. In some examples, the second message instructs a command to update the current frequency-dependent subband impairment estimate based on a difference between the current temperature at the network node and a previous temperature at the network node exceeding a temperature threshold, updates to one or more transmit antennas at the network node, and / or periodic scheduling. In some examples, the current frequency-dependent subband impairment estimate may be an initial frequency-dependent subband impairment estimate associated with the UE establishing an initial connection with the network node. The UE may eliminate or reduce frequency-dependent subband impairment in the downlink signal based on the receipt of the second message. In some examples, frequency-dependent subband impairment can be eliminated or reduced based on a current frequency-dependent subband impairment estimate associated with a second message indicating a command for maintaining the current frequency-dependent subband impairment estimate. In other examples, frequency-dependent subband impairment can be eliminated or reduced based on an update to the current frequency-dependent subband impairment estimate associated with a second message indicating a command for updating the current frequency-dependent subband impairment estimate.

[0033] Specific aspects of the subject matter described in this disclosure can be implemented to achieve one or more of the following potential advantages. In some examples, the described techniques for selectively instructing the UE to update the current frequency-dependent subband impairment estimate reduce unnecessary or redundant frequency-dependent subband impairment estimates at the UE. Reducing redundant frequency-dependent subband impairment estimates at the UE reduces resource usage at the UE, which can reduce network latency and improve UE battery life.

[0034] Figure 1This is a diagram illustrating a network 100 in which various aspects of the present disclosure may be practiced. Network 100 may be a 5G or NR network, or some other wireless network (such as an LTE network). Wireless network 100 may include multiple BS 110s (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B, access point, Transmit and Receive Point (TRP), network node, network entity, etc. A base station may be implemented as a converged base station, a decomposed base station, an Integrated Access and Backhaul (IAB) node, a relay node, a sidelink node, etc. A base station may be implemented in a converged or monolithic base station architecture, or alternatively, in a decomposed base station architecture, and may include one or more of a central unit (CU), a distributed unit (DU), a radio unit (RU), a near real-time (near RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC.

[0035] Each BS can provide communication coverage for a specific geographic area. In 3GPP, depending on the context in which the term is used, the term "cell" can refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area.

[0036] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or another type of cell. A macrocell covers a relatively large geographic area (e.g., a radius of several kilometers) and allows unrestricted access for UEs with a service subscription. A picocell covers a relatively small geographic area and allows unrestricted access for UEs with a service subscription. A femtocell covers a relatively small geographic area (e.g., a residential area) and allows restricted access by UEs associated with that femtocell (e.g., UEs in a Closed Subscriber Group (CSG)). A BS used for macrocells can be referred to as a macro BS. A BS used for picocells can be referred to as a pico BS. A BS used for femtocells can be referred to as a femto BS or a home BS. Figure 1 In the example shown, BS 110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “AP,” “node B,” “5G NB,” “TRP,” and “cell” are used interchangeably.

[0037] In some respects, the cell does not need to be stationary, and the geographical area of ​​the cell can be moved depending on the location of the mobile BS. In some respects, the BS can use any suitable transport network to interconnect with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.).

[0038] The wireless network 100 may also include relay stations. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and transmit the data transmissions to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, relay station 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay station can also be referred to as a relay BS, relay base station, repeater, etc.

[0039] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs can have high transmit power levels (e.g., 5 watts to 40 watts), while pico BSs, femto BSs, and relay BSs can have lower transmit power levels (e.g., 0.1 watts to 2 watts).

[0040] As an example, BS 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and core network 130 can exchange communication via backhaul link 132 (e.g., S1, etc.). Base stations 110 can communicate with each other directly or indirectly (e.g., via core network 130) via other backhaul links (e.g., X2, etc.).

[0041] The core network 130 may be an evolved packet core (EPC), which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may be a control node that processes signaling between UE120 and the EPC. All user IP packets can be transmitted through the S-GW, which itself may be connected to the P-GW. The P-GW provides IP address allocation and other functions. The P-GW may be connected to the network operator's IP services. The operator's IP services may include the Internet, intranet, IP Multimedia Subsystem (IMS), and packet switching (PS) streaming services.

[0042] Core network 130 can provide user authentication, access authorization, tracking, IP connectivity, and other access, routing, or mobility functions. One or more of base stations 110 or access node controllers (ANCs) can interface with core network 130 via backhaul links 132 (e.g., S1, S2, etc.) and can perform radio configuration and scheduling for communications with UE 120. In some configurations, the various functions of each access network entity or base station 110 can be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., base station 110).

[0043] UEs 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. UEs may be cellular phones (e.g., smartphones), personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, laptops, cordless phones, wireless local loop (WLL) stations, tablets, cameras, gaming devices, netbooks, smartbooks, ultrabooks, medical devices or equipment, biometric sensors / devices, wearable devices (smartwatches, smart clothing, smart glasses, smart wristbands, smart jewelry (e.g., smart rings, smart bracelets)), entertainment devices (e.g., music or video devices, or satellite radios), vehicle components or sensors, smart meters / sensors, industrial manufacturing equipment, GPS devices, or any other suitable device configured to communicate via wireless or wired media.

[0044] One or more UEs 120 can establish Protocol Data Unit (PDU) sessions for network slices. In some cases, UE 120 can select network slices based on applications or subscription services. By assigning different network slices to different applications or subscriptions, UE 120 can improve its resource utilization in the wireless network 100 while also meeting the performance specifications of each application of UE 120. In some cases, the network slice used by UE 120 can be provided by an AMF (Application-Specific Component) associated with one or both of base station 110 and core network 130. Figure 1 (Not shown in the image) to provide services. In addition, session management for network slices can be performed by the Access and Mobility Management Function (AMF).

[0045] UE 120 may include a frequency-dependent subband module 140. For simplicity, only one UE 120d is shown as including the frequency-dependent subband module 140. The frequency-dependent subband module 140 may perform one or more operations, such as referencing Figure 6 One or more operations of the described process 600.

[0046] Core network 130 or base station 110 or any other network device (e.g., as in...) Figure 3 (As seen in the image) may include a frequency-dependent subband module 138. The frequency-dependent subband module 138 may perform one or more operations, such as referencing... Figure 8 One or more operations of the described process 800.

[0047] Some UEs can be considered Machine-Type Communication (MTC) or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide connectivity to or from a network (e.g., a wide area network such as the Internet or cellular networks) via wired or wireless communication links. Some UEs can be considered Internet of Things (IoT) devices and / or can be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs can be considered Customer Premises Equipment (CPE). UE 120 can be included in a housing that houses the components of UE 120, such as processor components, memory components, etc.

[0048] Generally, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific Radio Access Technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as a radio technology, air interface, etc. Frequency can also be referred to as a carrier, frequency channel, etc. Within a given geographical area, each frequency can support a single RAT to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0049] In some respects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary device to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, mesh networks, etc.). In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein that are performed by base station 110. For example, base station 110 may configure UE 120 via downlink control information (DCI), radio resource control (RRC) signaling, media access control-control element (MAC-CE), or via system information (e.g., system information block (SIB)).

[0050] As indicated above, Figure 1 This is provided as an example only. Other examples are available in conjunction with [the relevant information]. Figure 1 The examples described are different.

[0051] Figure 2 A block diagram of a design 200 for a base station 110 and a UE 120 is shown. The base station can be... Figure 1 One of the base stations in the network, and the UE can be Figure 1 One of the UEs in the UE. Base station 110 may be equipped with T antennas 234a to 234t, and UE 120 may be equipped with R antennas 252a to 252r, where generally, T≥1 and R≥1.

[0052] At base station 110, transmit processor 220 can receive data for one or more UEs from data source 212, select one or more modulation and decoding schemes (MCS) for each UE based at least in part on the channel quality indicator (CQI) received from each UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. Reducing the MCS decreases throughput but increases transmission reliability. Transmit processor 220 can also process system information (e.g., semi-static resource partitioning information (SRPI) and / or control information (e.g., CQI requests, grants, upper-layer signaling, etc.), and provide overhead symbols and control symbols. Transmit processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., pre-decoding, if applicable) on data symbols, control symbols, overhead symbols, and / or reference symbols, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process its corresponding output symbol stream (e.g., for orthogonal frequency division multiplexing (OFDM), etc.) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t, respectively. Position coding can be used to generate synchronization signals to transmit additional information, according to various aspects described in more detail below.

[0053] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations, and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM, etc.) to obtain a received symbol. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide the detected symbols. Receiver processor 258 can process (e.g., demodulate and decode) the detected symbols, provide the decoded data for UE 120 to data sink 260, and provide the decoded control information and system information to controller / processor 280. The channel processor can determine the Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Signal Received Quality (RSRQ), and / or Channel Quality Indicator (CQI), etc. In some aspects, one or more components of the UE 120 may be included in a housing.

[0054] On the uplink, at UE 120, the transmitting processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmitting processor 264 can also generate reference symbols for one or more reference signals. Symbols from the transmitting processor 264 can be pre-decoded by the TXMIMO processor 266 (if applicable), further processed by modulators 254a to 254r (e.g., for Discrete Fourier Transform Extended OFDM (DFT-s-OFDM), CP-OFDM, etc.), and transmitted to base station 110. At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 254, detected by MIMO detector 236 (if applicable), and further processed by receiving processor 238 to obtain decoded data and control information transmitted by UE 120. The receiver processor 238 can provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicates with the core network 130 via the communication unit 244. The core network 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0055] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 and / or Figure 2Any other component may perform one or more techniques associated with estimating frequency-related impairments, as described in more detail elsewhere. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component that can execute or direct, for example Figure 6 and Figure 8 The operation of the process and / or other processes as described. Memory 242 and memory 282 may store data and program code for base station 110 and UE 120, respectively. Scheduler 246 may schedule UEs for data transmission on downlink and / or uplink.

[0056] The deployment of communication systems (such as 5G New Radio (NR) systems) can involve various components or parts arranged in multiple ways. In a 5G NR system or network, network nodes, network entities, network mobility elements, radio access network (RAN) nodes, core network nodes, network elements or network equipment (such as base stations (BS)), or one or more units (or components) performing base station functionality can be implemented in aggregated or decomposed architectures. For example, BSs (such as Node B (NB), evolved NB (eNB), NR BS, 5G NB, access point (AP), transmit and receive point (TRP), or cell, etc.) can be implemented as aggregated base stations (also known as standalone BS or monolithic BS) or decomposed base stations.

[0057] Aggregated base stations can be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node. Decentralized base stations can be configured to utilize a protocol stack that is physically or logically distributed across two or more units, such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs) (i.e., one or more central or centralized units). In some aspects, the CU may be implemented within a RAN node, and one or more DUs may co-located with the CU, or alternatively, may be geographically or virtually distributed across one or more other RAN nodes. DUs may be implemented to communicate with one or more RUs. Each of the CU, DU, and RU may also be implemented as a virtual unit (e.g., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU)).

[0058] Base station type operation or network design can take into account the aggregation characteristics of base station functionality. For example, decomposed base stations can be utilized in Integrated Access Backhaul (IAB) networks, Open Radio Access Networks (O-RAN (such as network configurations initiated by the O-RAN Alliance)), or Virtualized Radio Access Networks (vRAN, also known as Cloud Radio Access Networks (C-RAN)). Decomposition can include distributing functionality across two or more units in various physical locations, as well as virtually distributing the functionality of at least one unit, which enables flexibility in network design. The various units in a decomposed base station or decomposed RAN architecture can be configured for wired or wireless communication with at least one other unit.

[0059] In some cases, different types of devices supporting different types of applications and / or services can coexist in a cell. Examples of different types of devices include UE handsets, Customer Premises Equipment (CPE), vehicles, Internet of Things (IoT) devices, etc. Examples of different types of applications include Ultra Reliable Low Latency Communication (URLLC) applications, Massive Machine-Type Communication (mMTC) applications, Enhanced Mobile Broadband (eMBB) applications, Vehicle-to-Everything (V2X) applications, etc. Furthermore, in some cases, a single device can simultaneously support different applications or services.

[0060] Figure 3 A diagram illustrating an example of a decomposed base station 300 architecture is shown. The decomposed base station 300 architecture may include one or more central units (CUs) 310, which may communicate directly with the core network 320 via a backhaul link, or indirectly with the core network 320 via one or more decomposed base station units, such as a near real-time (near-RT) RAN Intelligent Controller (RIC) 325 via an E2 link, or a non-real-time (non-RT) RIC 315 associated with a Service Management and Orchestration (SMO) framework 305, or both. CUs 310 may communicate with one or more distributed units (DUs) 330 via appropriate midhaul links (such as F1 interfaces). DUs 330 may communicate with one or more radio units (RUs) 340 via appropriate fronthaul links. RUs 340 may communicate with corresponding UEs 120 via one or more radio frequency (RF) access links. In some implementations, a UE 120 may be served simultaneously by multiple RUs 340.

[0061] Each of these units (e.g., CU 310, DU 330, RU 340, and near-RT RIC 325, non-RT RIC 315, and SMO frame 305) may include one or more interfaces, or may be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via wired or wireless transmission media. Each of the units, or an associated processor or controller providing instructions to the communication interfaces of these units, may be configured to communicate with one or more other units via transmission media. For example, these units may include wired interfaces configured to receive signals or transmit signals to one or more other units via wired transmission media. Additionally, these units may include wireless interfaces that may include receivers, transmitters, or transceivers (such as radio frequency (RF) transceivers) configured to receive signals or transmit signals to one or more other units via wireless transmission media, or both.

[0062] In some aspects, the CU 310 can host one or more higher-level control functions. Such control functions may include Radio Resource Control (RRC), Packet Data Convergence Protocol (PDCP), Serving Data Adaptation Protocol (SDAP), etc. Each control function can be implemented using an interface configured to signal to other control functions hosted by the CU 310. The CU 310 can be configured to handle user plane functions (e.g., Central Unit-User Plane (CU-UP)), control plane functions (e.g., Central Unit-Control Plane (CU-CP)), or combinations thereof. In some implementations, the CU 310 can be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP units can communicate bidirectionally with the CU-CP units via an interface such as an E1 interface. The CU 310 can be implemented to communicate with the DU 330 for network control and signaling, as needed.

[0063] DU 330 may correspond to a logic unit that includes one or more base station functions for controlling the operation of one or more RU 340s. In some aspects, DU 330 may, at least in part, host one or more of the Radio Link Control (RLC) layer, the Media Access Control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.) depending on functional splits (such as those defined by the 3rd Generation Partnership Project (3GPP). In some aspects, DU 330 may also host one or more low PHY layers. Each layer (or module) may be implemented using an interface configured to communicate signaling with other layers (and modules) hosted by DU 330 or with control functions hosted by CU 310.

[0064] Lower-layer functionality can be implemented by one or more RU 340s. In some deployments, an RU340 controlled by a DU 330 may correspond to a logical node that hosts RF processing functions or low-PHY layer functions (such as performing Fast Fourier Transform (FFT), Inverse FFT (iFFT), digital beamforming, Physical Random Access Channel (PRACH) extraction and filtering, or both, based at least in part on functional decomposition (such as lower-layer functional decomposition). In this architecture, the RU 340 may be implemented to handle over-the-air (OTA) communications with one or more UE 120s. In some specific implementations, the real-time and non-real-time aspects of control plane and user plane communications with the RU 340 may be controlled by the corresponding DU 330. In some scenarios, this configuration enables the implementation of the DU 330 and CU 310 in a cloud-based RAN architecture (such as a vRAN architecture).

[0065] The SMO framework 305 can be configured to support RAN deployment and provisioning of both non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO framework 305 can be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which can be managed via operation and maintenance interfaces such as the O1 interface. For virtualized network elements, the SMO framework 305 can be configured to interact with a cloud computing platform such as the Open Cloud (O-cloud) 390 to perform network element lifecycle management (such as instantiating virtualized network elements) via a cloud computing platform interface such as the O2 interface. Such virtualized network elements may include, but are not limited to, CU 310, DU 330, RU 340, and near-RT RIC 325. In some implementations, the SMO framework 305 can communicate with the hardware aspects of the 4G RAN (such as the Open eNB (O-eNB) 311) via the O1 interface. Additionally, in some implementations, the SMO framework 305 can communicate directly with one or more RU 340s via the O1 interface. The SMO framework 305 may also include a non-RT RIC 315 configured to support the functionality of the SMO framework 305.

[0066] The non-RT RIC 315 can be configured to include logical functions enabling non-real-time control and optimization of RAN elements and resources, including AI / ML workflows for model training and updates, or policy-based guidance for applications / features in the near-RT RIC 325. The non-RT RIC 315 can be coupled to or communicate with the near-RT RIC 325, such as via an A1 interface. The near-RT RIC 325 can be configured to include logical functions enabling near real-time control and optimization of RAN elements and resources via data collection and actions through an interface such as an E2 interface that connects one or more CU 310s, one or more DU 330s, or both, and an O-eNB 311 to the near-RT RIC 325.

[0067] In some implementations, to generate AI / ML models to be deployed in the near-RT RIC 325, the non-RT RIC 315 may receive parameters or external enrichment information from an external server. This information can be utilized by the near-RT RIC 325 and can be received from non-network data sources or network functions at the SMO framework 305 or the non-RT RIC 315. In some examples, the non-RT RIC 315 or near-RT RIC 325 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 315 may monitor long-term trends and patterns in performance and employ AI / ML models to perform corrective actions via the SMO framework 305 (such as reconfiguration via O1) or via the creation of RAN management policies (such as A1 policies).

[0068] Mismatch between the in-phase (I) and quadrature (Q) components of a signal can lead to frequency-dependent subband impairments, such as frequency-dependent residual sidebands. Frequency-dependent subband impairments can interfere with wireless communication, and the interference can increase with increasing carrier frequency. Frequency-dependent subband impairments can also increase with the number of transmitting antennas at network nodes. In some cases, network nodes can maintain frequency-dependent subband impairments below a threshold to enable low-order QAM transmission. Additionally or alternatively, receivers such as UEs can estimate and eliminate frequency-dependent subband impairments. UE elimination of frequency-dependent subband impairments can enable super-QAM transmission (e.g., up to 16,000 QAM).

[0069] The process for eliminating frequency-dependent subband impairments begins with the UE estimating the impairments based on measurements from one or more pilot signals. The UE can then eliminate or reduce the estimated impairments from the downlink signal. In a conventional system, the UE estimates the impairments within each downlink time slot. Estimating and eliminating impairments at each downlink time slot can increase UE complexity and increase latency per downlink time slot. Frequency-dependent subband impairments may change little between consecutive time slots, making per-slot estimation redundant and avoidable. As an example, frequency-dependent subband impairments may vary due to temperature changes in the remote radio head (RRH) associated with the network node.

[0070] I / Q modulators can be integrated with RRHs placed on rooftops or atop cell towers. Typically, RRHs operate over a broad temperature range of -40°C to +55°C (e.g., -40°F to +131°F), enabling reliable operation under extremely cold or hot conditions. Temperature variations in an RRH can be attributed to one or more factors, such as RRH design, environmental conditions, and / or cooling mechanisms. For example, due to its installation location on a cell tower or rooftop, an RRH may experience a wide variety of weather conditions, including heat from the sun. Without adequate cooling, the internal RRH temperature may rise above a threshold temperature (e.g., 131°F). Reducing the RRH temperature improves its performance. Therefore, an RRH may include a cooling system, such as a fan, radiator, and / or heat exchanger. The cooling system dissipates heat from the electronic components of the RRH, thereby keeping the internal temperature within acceptable limits.

[0071] Temperature variations at the I / Q modulator can cause changes in frequency-dependent subband impairment. However, temperature variation is not the only cause of frequency-dependent subband impairment variation. Events such as network nodes updating one or more transmit antennas, changes in sectors, and / or other changes at the RRH can also cause frequency-dependent subband impairment variation. In such instances, it may be necessary to re-estimate the frequency-dependent subband impairment. In most cases, frequency-dependent subband impairment changes approximately once per second, thus making per-slot frequency-dependent subband impairment estimation unnecessary.

[0072] Various aspects of this disclosure relate to reducing (e.g., minimizing) the rate of estimation of frequency-dependent subband damage. Figure 4 This is a timing diagram 400 illustrating examples of estimating frequency-correlated subband impairments according to various aspects of this disclosure. For example... Figure 4 As shown in the example, network node 110 can communicate with UE 120.

[0073] exist Figure 4In the example, at time t1, network node 110 learns the rate of change of transmitted frequency-dependent subband impairment. Additionally, at time t1, network node 110 may determine a schedule and / or one or more triggers for instructing UE 120 to update the frequency-dependent subband impairment estimate. One or more triggers may include, but are not limited to, a difference between the current temperature and a previous temperature greater than T degrees and / or a change in one or more transmit antennas. The previous temperature may correspond to the time when a previous command for updating the frequency-dependent subband impairment estimate was sent to UE 120. This schedule may be per-slot scheduling, such as periodic scheduling. For example, network node 110 may instruct UE 120 to update once every N timeslots, regardless of whether one or more other triggers are activated. In some examples, the operations described with reference to time t1 may be performed offline. For example, the rate of change may be learned offline. Additionally, T degrees and N timeslots may be learned offline.

[0074] At time t2, network node 110 may receive a first message from UE 120 instructing UE 120 to eliminate frequency-dependent subband impairments. The first message may be an RRC message or another type of control message. In some examples, the first message may be received during the process of establishing a connection between UE 120 and network node 110. Based on the establishment of a connection with UE 120 and also based on UE 120's ability to eliminate frequency-dependent subband impairments, network node 110 may send an initial command to UE 120 at time t3 for estimating initial frequency-dependent subband impairments. At time t4, UE 120 may estimate the frequency-dependent subband impairments based on the received initial command. In some examples, frequency-dependent subband impairments may be associated with one or more measurements associated with the same or more pilot symbols. For example, network node 110 may send one or more pilot symbols to UE 120. In this example, UE 120 may measure one or more pilot symbols, and the frequency-dependent subband impairment estimation may be associated with the measurement of one or more pilot symbols. At time t5, UE 120 can eliminate frequency-related subband impairment in the downlink signal based on the initial frequency-related subband impairment estimate.

[0075] After sending the second message, network node 110 may send a second message to UE 120 at time t6, indicating a command for updating or maintaining the current frequency-related subband impairment estimate (e.g., initial frequency-related subband impairment). This command may be associated with a single bit indicating whether to update or maintain the current frequency-related subband impairment estimate. The current frequency-related subband impairment estimate may be maintained based on a single bit having a first value, and may be updated based on a single bit having a second value. The second message and the initial command may be sent via a downlink control channel, such as the Physical Downlink Control Channel (PDCCH).

[0076] In some examples, at time t7a, UE 120 may update the current frequency-dependent subband impairment estimate according to a second message indicating a command for updating the current frequency-dependent subband impairment estimate. In such examples, at time t8a, UE 120 may eliminate frequency-dependent subband impairment in the downlink signal based on the updated initial frequency-dependent subband impairment estimate. In some other examples, at time t7b, UE 120 may maintain the current frequency-dependent subband impairment estimate according to a second message indicating a command for maintaining the current frequency-dependent subband impairment estimate (e.g., the initial frequency-dependent subband impairment). In such examples, at time t8b, UE 120 may eliminate frequency-dependent subband impairment in the downlink signal based on the current initial frequency-dependent subband impairment estimate. In some examples, eliminating frequency-dependent subband impairment includes partially eliminating the frequency-dependent subband impairment.

[0077] As discussed, the command for updating the current frequency-dependent subband impairment estimate may be sent based on periodic scheduling (e.g., once every N time slots) or in response to one or more triggering conditions. One or more triggering conditions may include a difference between the current temperature at network node 110 and a previous temperature at network node 110 that is greater than a temperature threshold and / or a change in one or more transmit antennas at network node 110. The previous temperature may be associated with a time period corresponding to a third message sent by network node 110 to UE 120 indicating another command for updating the previous frequency-dependent subband impairment. In this example, the third message is sent before the second message sent at time t6.

[0078] As discussed, at time t1, network node 110 can learn the rate of change of frequency-dependent subband damage operation during the offline phase. In some examples, the measurement may be performed by the manufacturer (e.g., at a factory) prior to the deployment phase. Laboratory equipment (such as a spectrum analyzer) may be used to perform the measurement. In some examples, multiple measurements may be obtained over a range of operating temperatures to determine the variance of the change in frequency-dependent subband damage relative to temperature and time.

[0079] In some examples, the measurement process may include two main steps during the offline acquisition phase, and each step may include recording half-band signals from different sides of the bandwidth. In such examples, a step function may be defined. ,in ,and , where variables Indicates frequency. In such examples, the step function... This allows selection of certain frequency ranges (positive or negative) for the measurement. The first measurement is performed during the offline acquisition phase. The representation that can be used to record the bandwidth allocation on the left is as follows. The half-band signal maintains a constant value of 0 dB across all subcarriers. A spectrum analyzer can show: Second measurement The representation that can be used to record the bandwidth allocation on the right is as follows. The half-band signal maintains a constant value of 0 dB across all subcarriers. A spectrum analyzer can show: The frequency-dependent components (I) and quadrature components (Q) associated with frequency-dependent subband damage are: and ) can be obtained for each half-band signal ( and The measurement is taken after the measurement of ). In such examples, ,and . and It is the frequency correlation coefficient, which reflects the frequency correlation characteristics of I / Q imbalance.

[0080] As discussed, frequency-dependent subband impairments can be estimated based on measurements of one or more pilot symbols, such as demodulation reference signals (DMRS) or sounding reference signals (SRS). In some examples, channel impairments can be estimated based on one or more pilot symbols. In such examples, channel estimation . The function returns the frequency correlation coefficient on the main diagonal. A square diagonal matrix of the elements of the associated vectors. This can be determined based on the estimated channel. To estimate frequency-correlated subband damage ,in Assuming frequency-correlated subband damage estimation By keeping the frequency constant across multiple subcarriers, the average value of the frequency-correlated subband impairment across these subcarriers can be calculated. This average value across the subcarriers can be referred to as averaging the frequency-correlated subband impairment curve. Specifically, for a given frequency-correlated subband impairment curve... and Each subcarrier indexed (where and The range is from 1 to Frequency-correlated subband damage estimation Same (e.g., ).

[0081] After averaging the frequency-dependent subband impairment curves, a smooth and continuous estimate of the frequency-dependent subband impairment curves across all subcarriers can be obtained by interpolation over all subcarriers. This interpolated curve will provide a more accurate and detailed representation of the frequency-dependent subband impairment variations across the entire frequency range. Once the frequency-dependent subband impairment curves are estimated using interpolation, the next step is to estimate the frequency-dependent subband impairment based on the frequency-dependent subband impairment estimate. This is used to correct or remove frequency-dependent subband impairments from the received signal. For example, UE 120 can use frequency-dependent subband impairment estimation... To counteract the effects of frequency-dependent subband damage on the signal.

[0082] Figure 5 This is a block diagram illustrating an example wireless communication device that selectively updates frequency-dependent subband impairment estimates in accordance with some aspects of this disclosure. Device 500 may be used as a reference. Figure 1 , Figure 2 , Figure 3 and Figure 4 Examples of various aspects of the described UE 120. The wireless communication device 500 may include a receiver 510, a communication manager 505, a transmitter 520, a frequency-dependent subband impairment estimation component 530, and a frequency-dependent subband impairment mitigation component 540, which can communicate with each other (e.g., via one or more buses). In some examples, the wireless communication device 500 is configured to perform operations, including those referenced below. Figure 6 The described process is the operation of 600.

[0083] In some examples, the wireless communication device 500 may include a chip, chipset, package, or device comprising at least one processor and at least one modem (e.g., a 5G modem or other cellular modem). In some examples, the communication manager 505 or its sub-components may be separate and distinct components. In some examples, at least some components of the communication manager 505 are at least partially implemented as software stored in memory. For example, portions of one or more components of the communication manager 505 may be implemented as non-transitory code executable by a processor to perform the function or operation of the respective component.

[0084] Receiver 510 may receive, via various channels including control channels (e.g., Physical Downlink Control Channel (PDCCH), Physical Uplink Control Channel (PUCCH), or Physical Shared Control Channel (PSCCH)) and data channels (e.g., Physical Downlink Shared Channel (PDSCH), Physical Sidelink Shared Channel (PSSCH), Physical Uplink Shared Channel (PUSCH)), reference signals (e.g., periodically configured Channel State Information Reference Signal (CSI-RS), aperiodically configured CSI-RS, or multi-beam specific reference signal), synchronization signals (e.g., synchronization signal block (SSB)), control information, and data information (such as in packet form) from one or more other wireless communication devices. Other wireless communication devices may include, but are not limited to, reference signals... Figure 1 , Figure 2 and Figure 4 The described base station 110, reference Figure 3 The DU 330, RU 340, or CU 310 described.

[0085] The received information can be transmitted to other components of device 500. Receiver 510 may be used as a reference. Figure 2 Examples of various aspects of the described receiver processor 258. Receiver 510 may include or otherwise utilize an array of antennas coupled to or utilizing an array of antennas (e.g., the array of antennas may be referenced). Figure 2 Examples of various aspects of the described antenna 252 are collections of radio frequency (RF) chains.

[0086] Transmitter 520 can transmit signals generated by communication manager 505 or other components of wireless communication device 500. In some examples, transmitter 520 may be co-located with receiver 510 in a transceiver. Transmitter 520 may be a reference Figure 2 Examples of various aspects of the described transmitting processor 264. Transmitter 520 may be coupled to or otherwise utilize an array of antennas (e.g., the array of antennas may be referenced). Figure 2 Examples of various aspects of the described antenna 252), this set of antennas may be antenna elements shared with the receiver 510. In some examples, the transmitter 520 is configured to transmit control information in the PUCCH, PSCCH, or PDCCH and data in the Physical Uplink Shared Channel (PUSCH), PSSCH, or PDSCH.

[0087] Communication Manager 505 can be used as a reference. Figure 2Examples of various aspects of the described controller / processor 280. The communication manager 505 may include a frequency-dependent subband impairment estimation component 530 and a frequency-dependent subband impairment mitigation component 540. In some examples, in conjunction with the operation of the receiver 510, the frequency-dependent subband impairment estimation component 530 receives a first message from a network node, the first message including a command for updating the current frequency-dependent subband impairment estimate or a command for maintaining the current frequency-dependent subband impairment estimate. Additionally, in conjunction with the operation of one or both of the frequency-dependent subband impairment estimation component 530 and the receiver 510, the frequency-dependent subband impairment mitigation component 540 may eliminate frequency-dependent subband impairment based on the received first message. This elimination may be based on: the current frequency-dependent subband impairment estimate being maintained according to the first message, or an update to the current frequency-dependent subband impairment estimate being updated according to the first message including a command for updating the current frequency-dependent subband impairment estimate. In some examples, this elimination may include partial elimination.

[0088] Figure 6 This is a flowchart illustrating an example procedure 600 performed by a UE according to some aspects of this disclosure. The UE may be used as a reference. Figure 1 , Figure 2 , Figure 3 and Figure 4 The example described is UE 120. Example procedure 600 is an example of selectively refreshing frequency-dependent subband impairment estimation. Figure 6 As shown, process 600 begins at block 602 by receiving a first message from a network node, the first message including a command for updating the current frequency-dependent subband impairment estimate or a command for maintaining the current frequency-dependent subband impairment estimate. At block 604, process 600 eliminates frequency-dependent subband impairment based on the received first message. This elimination may be based on: the current frequency-dependent subband impairment estimate being maintained according to the first message, or an update to the current frequency-dependent subband impairment estimate being updated according to the first message including a command for updating the current frequency-dependent subband impairment estimate.

[0089] Figure 7 This is a block diagram illustrating an example wireless communication device 700 that selectively commands a UE to update frequency-dependent subband impairment estimates according to various aspects of this disclosure. Wireless communication device 700 may be used as a reference. Figure 1 , Figure 2 and Figure 4 The described base station 110, reference Figure 3Examples of the described DU 330, RU 340, or CU 310. Wireless communication device 700 may include receiver 710, communication manager 715, frequency-dependent subband impairment component 730, frequency-dependent subband impairment estimation component 740, and transmitter 720, which can communicate with each other (e.g., via one or more buses). In some examples, wireless communication device 700 is configured to perform operations, including those referenced below. Figure 8 The described process is the operation of 800.

[0090] In some examples, the wireless communication device 700 may include a chip, a system-on-a-chip (SOC), a chipset, a package, or a device including at least one processor and at least one modem (e.g., a 5G modem or other cellular modem). In some examples, the communication manager 715 or its sub-components may be separate and distinct components. In some examples, at least some components of the communication manager 715 are at least partially implemented as software stored in memory. For example, portions of one or more components of the communication manager 715 may be implemented as non-transitory code executable by a processor to perform the function or operation of the respective component.

[0091] Receiver 710 can receive one or more reference signals (e.g., periodically configured CSI-RS, non-periodic configured CSI-RS, or multi-beam specific reference signals), synchronization signals (e.g., synchronization signal blocks (SSBs)), control information, and / or data information (such as in packet form) from one or more other wireless communication devices via various channels including control channels (e.g., PUCCH or PSCCH) and data channels (e.g., PUSCH or PSSCH). Other wireless communication devices may include, but are not limited to, reference signals. Figure 1 , Figure 2 , Figure 3 and Figure 4 The other base station 110 or UE 120 is described.

[0092] The received information can be transmitted to other components of the wireless communication device 700. Receiver 710 may be used as a reference. Figure 2 Examples of various aspects of the described receiver processor 238. Receiver 710 may include or otherwise utilize an array of antennas coupled to or utilizing an array of antennas (e.g., the array of antennas may be referenced). Figure 2 Examples of various aspects of the described antenna 234 are collections of radio frequency (RF) chains.

[0093] Transmitter 720 can transmit signals generated by communication manager 715 or other components of wireless communication device 700. In some examples, transmitter 720 may be co-located with receiver 710 in a transceiver. Transmitter 720 may be a reference Figure 2Examples of aspects of the described transmit processor 220. Transmitter 720 may be coupled to or otherwise utilize an array of antennas (e.g., the array of antennas may be an example of aspects of antenna 234), which may be antenna elements shared with receiver 710. In some examples, transmitter 720 is configured to transmit control information in PDCCH or PSCCH and data in PDSCH or PSSCH.

[0094] Communication Manager 715 can be used as a reference. Figure 2 Examples of various aspects of the described controller / processor 240. The communication manager 715 includes a frequency-dependent subband impairment component 730 and a frequency-dependent subband impairment estimation component 740. In some examples, in conjunction with the operation of one or both of the transmitter 720 or receiver 710, the frequency-dependent subband impairment component 730 learns the rate of change associated with frequency-dependent subband impairment. Additionally, in conjunction with the operation of the receiver 710, the frequency-dependent subband impairment component 730 receives a first message instructing the UE of its ability to eliminate frequency-dependent subband impairment. Furthermore, in conjunction with the operation of one or both of the transmitter 720 or frequency-dependent subband impairment component 730, the frequency-dependent subband impairment estimation component 740 sends a second message, based on the rate of change and the UE's ability to eliminate frequency-dependent subband impairment, instructing a command for updating or maintaining the current frequency-dependent subband impairment estimate.

[0095] Figure 8 This is a flowchart illustrating an example of a process 800 performed by a network node according to some aspects of this disclosure. A wireless device may be used as a reference. Figure 1 , Figure 2 and Figure 4 The described base station 110, reference Figure 3 Examples of the described DU 330, RU 340, or CU310. Example procedure 800 is an example of receiving multiple PRACH transmissions from a single UE. As shown in Figure 10, procedure 800 begins at block 802 by learning the rate of change associated with frequency-dependent subband impairment. At block 804, procedure 800 receives a first message indicative of the UE's ability to eliminate frequency-dependent subband impairment. At block 806, procedure 800, based on the rate of change and the UE's ability to eliminate frequency-dependent subband impairment, sends a second message indicative of a command for updating or maintaining the current frequency-dependent subband impairment estimate.

[0096] Specific implementation examples are described in the following numbered clauses: Clause 1. A method for wireless communication by a UE, the method comprising: receiving a first message from a network node, the first message including a command for updating a current frequency-dependent subband impairment estimate or a command for maintaining the current frequency-dependent subband impairment estimate; and eliminating frequency-dependent subband impairment based on receiving the first message, the elimination being based on: the current frequency-dependent subband impairment estimate being based on the first message including the command for maintaining the current frequency-dependent subband impairment estimate, or the current frequency-dependent subband impairment estimate being updated based on the first message including the command for updating the current frequency-dependent subband impairment estimate.

[0097] Clause 2. The method according to Clause 1, the method further comprising updating the current frequency-dependent subband damage estimate according to the first message including the command for updating the current frequency-dependent subband damage estimate.

[0098] Clause 3. The method according to Clause 2, the method further comprising: receiving one or more pilot symbols from the network node; and measuring the one or more pilot symbols, wherein the current frequency-dependent subband impairment estimate is updated based on the measurement of the one or more pilot symbols.

[0099] Clause 4. The method according to any one of Clauses 1 to 3, the method further comprising receiving an additional corresponding first message at each of a set of time slots, the additional corresponding first message including a command for updating the corresponding current frequency-dependent subband impairment estimate or a command for maintaining the corresponding current frequency-dependent subband impairment estimate.

[0100] Clause 5. The method according to any one of Clauses 1 to 4, wherein: the command for updating the current frequency-dependent subband damage estimate and the command for maintaining the current frequency-dependent subband damage estimate are associated with the same single bit indicating whether to update or maintain the current frequency-dependent subband damage estimate; the current frequency-dependent subband damage estimate is maintained based on the single bit having a first value; and the current frequency-dependent subband damage estimate is updated based on the single bit having a second value.

[0101] Clause 6. The method according to any one of Clauses 1 to 5, the method further comprising estimating an initial frequency-dependent subband impairment in association with initializing a connection to the network node, wherein the initial frequency-dependent subband impairment estimate is the current frequency-dependent subband impairment estimate.

[0102] Clause 7. The method according to any one of Clauses 1 to 6, wherein the first message is received based on an update and / or periodic scheduling of one or more transmit antennas at the network node, provided that the difference between the current temperature at the network node and the previous temperature at the network node is greater than a temperature threshold.

[0103] Clause 8. The method according to Clause 7, wherein the previous temperature is associated with a time period corresponding to a third message received from the network node prior to receiving the first message, indicating another command for updating the previous frequency-related subband impairment estimate.

[0104] Clause 9. The method according to any one of Clauses 1 to 8, the method further comprising sending a second message to the network node instructing the UE to eliminate frequency-dependent subband impairments.

[0105] Clause 10. A method for wireless communication by a network node, the method comprising: knowing a rate of change associated with frequency-dependent subband impairment; receiving a first message instructing a UE to eliminate the frequency-dependent subband impairment; and, based on the rate of change and the UE's ability to eliminate the frequency-dependent subband impairment, sending a second message instructing a command for updating or maintaining a current frequency-dependent subband impairment estimate.

[0106] Clause 11. The method according to Clause 10, the method further comprising transmitting one or more pilot symbols, wherein the current frequency-dependent subband impairment estimate is associated with the one or more pilot symbols.

[0107] Clause 12. The method according to any one of Clauses 10 to 11, the method further comprising sending an additional corresponding second message at each of a set of time slots, the additional corresponding second message including a command for updating the corresponding current frequency-dependent subband damage estimate or a command for maintaining the corresponding current frequency-dependent subband damage estimate.

[0108] Clause 13. The method according to any one of Clauses 10 to 12, wherein: the command for updating the current frequency-dependent subband damage estimate and the command for maintaining the current frequency-dependent subband damage estimate are associated with the same single bit indicating whether to update or maintain the current frequency-dependent subband damage estimate; the current frequency-dependent subband damage estimate is maintained based on the single bit having a first value; and the current frequency-dependent subband damage estimate is updated based on the single bit having a second value.

[0109] Clause 14. The method according to any one of Clauses 10 to 13, wherein the rate of change is associated with one or more of a temperature threshold, an update of one or more transmit antennas at the network node, and / or periodic scheduling.

[0110] Clause 15. The method according to Clause 14, wherein: the second message includes the command for updating the current frequency-dependent subband impairment estimate based on the difference between the current temperature at the network node and the previous temperature at the network node being greater than the temperature threshold; and the previous temperature is associated with a time period corresponding to a third message sent prior to the sending of the second message indicating another command for updating the previous frequency-dependent subband impairment.

[0111] Clause 16. The method according to Clause 15, wherein the one or more transmit antennas are updated according to the network node, and the second message includes the command for updating the current frequency-dependent subband impairment estimate.

[0112] Clause 17. The method according to Clause 15, wherein the second message according to the periodic scheduling includes the command for updating the current frequency-related subband impairment estimate.

[0113] The foregoing disclosure provides examples and descriptions, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations can be made based on the foregoing disclosure, or from the practices of the various aspects.

[0114] The threshold is used to describe certain aspects. As used, depending on the context, meeting the threshold can mean that the value is 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, not equal to the threshold, etc.

[0115] It will be apparent that the described systems and / or methods can be implemented in various forms, including hardware, firmware, and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not limiting in any way. Therefore, since the operation and performance of these systems and / or methods are described without reference to specific software code, it should be understood that the software and hardware used to implement these systems and / or methods can be designed, at least in part, based on this description.

[0116] Although specific combinations of features are set forth in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in ways not specifically set forth in the claims and / or not disclosed in the specification. Although each dependent claim listed below may depend directly on only one claim, the disclosure of various aspects includes each dependent claim combined with every other claim in the claim set. The phrase referring to “at least one of” the list of items means 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, ab, ac, bc, and abc, as well as any combination having multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0117] The elements, actions, or instructions used should not be interpreted as critical or necessary unless explicitly stated otherwise. Furthermore, as used, the articles “a” and “one” are intended to include one or more items and may be used interchangeably with “one or more.” Additionally, as used, the terms “set” and “group” are intended to include one or more items (e.g., related items, irrelevant items, combinations of related and irrelevant items, etc.) and may be used interchangeably with “one or more.” If only one item is desired, the phrase “only one” or similar terminology will be used. Furthermore, as used, the terms “have,” “possess,” “have,” etc., are intended to be open-ended terms. Additionally, the phrase “based on” is intended to mean “at least partially based on” unless otherwise explicitly stated.

Claims

1. A method for wireless communication by a user equipment (UE), the method comprising: Receive a first message from a network node, the first message including a command for updating the current frequency-dependent subband impairment estimate or a command for maintaining the current frequency-dependent subband impairment estimate; as well as Frequency-dependent subband impairment is eliminated based on the receipt of the first message, the elimination being based on: According to the first message including the command for maintaining the current frequency-dependent subband impairment estimate, it is the current frequency-dependent subband impairment estimate, or The first message, which includes the command for updating the current frequency-dependent subband impairment estimate, is an update to the current frequency-dependent subband impairment estimate.

2. The method of claim 1, further comprising updating the current frequency-dependent subband damage estimate according to the first message including the command for updating the current frequency-dependent subband damage estimate.

3. The method according to claim 2, further comprising: Receive one or more pilot symbols from the network node; as well as The one or more pilot symbols are measured, wherein the current frequency-dependent subband impairment estimate is updated based on the measurement of the one or more pilot symbols.

4. The method of claim 1, further comprising receiving an additional corresponding first message at each of a set of time slots, the additional corresponding first message including a command for updating the corresponding current frequency-dependent subband impairment estimate or a command for maintaining the corresponding current frequency-dependent subband impairment estimate.

5. The method according to claim 1, wherein: The command for updating the current frequency-related subband damage estimate and the command for maintaining the current frequency-related subband damage estimate are associated with the same single bit indicating whether to update or maintain the current frequency-related subband damage estimate; The current frequency-dependent subband impairment estimate is maintained based on the single bit having a first value; and The current frequency-dependent subband impairment estimate is updated based on the single bit having a second value.

6. The method of claim 1, further comprising estimating an initial frequency-dependent subband impairment in association with initializing a connection to the network node, wherein the initial frequency-dependent subband impairment estimate is the current frequency-dependent subband impairment estimate.

7. The method of claim 1, wherein the first message is received based on an update and / or periodic scheduling of one or more transmit antennas at the network node, provided that the difference between the current temperature at the network node and the previous temperature at the network node is greater than a temperature threshold.

8. The method of claim 7, wherein the previous temperature is associated with a time period corresponding to a third message received from the network node prior to receiving the first message, indicating another command for updating the previous frequency-related subband impairment estimate.

9. The method of claim 1, further comprising sending a second message to the network node instructing the UE of its ability to eliminate the frequency-dependent subband impairment.

10. A user equipment (UE), the user equipment (UE) comprising: One or more processors; and One or more memories, coupled to and storing processor-executable code, which, when executed by the one or more processors, is configured to cause the UE to: Receive a first message from a network node, the first message including a command for updating the current frequency-dependent subband impairment estimate or a command for maintaining the current frequency-dependent subband impairment estimate; as well as Frequency-dependent subband impairment is eliminated based on the receipt of the first message, the elimination being based on: According to the first message including the command for maintaining the current frequency-dependent subband impairment estimate, it is the current frequency-dependent subband impairment estimate, or The first message, which includes the command for updating the current frequency-dependent subband impairment estimate, is an update to the current frequency-dependent subband impairment estimate.

11. The UE of claim 10, wherein the execution of the processor executable code further causes the UE to update the current frequency-dependent subband impairment estimate according to the first message including the command for updating the current frequency-dependent subband impairment estimate.

12. The UE according to claim 11, wherein: The execution of the processor-executable code further enables the UE to: Receive one or more pilot symbols from the network node; and Measure the one or more pilot symbols; and The current frequency-dependent subband impairment estimate is updated based on measurements of the one or more pilot symbols.

13. The UE of claim 10, wherein the execution of the processor executable code further causes the UE to receive an additional corresponding first message at each of a set of time slots, the additional corresponding first message including a command for updating the corresponding current frequency-related subband impairment estimate or a command for maintaining the corresponding current frequency-related subband impairment estimate.

14. The UE according to claim 10, wherein: The command for updating the current frequency-related subband damage estimate and the command for maintaining the current frequency-related subband damage estimate are associated with the same single bit indicating whether to update or maintain the current frequency-related subband damage estimate; The current frequency-dependent subband impairment estimate is maintained based on the single bit having a first value; and The current frequency-dependent subband impairment estimate is updated based on the single bit having a second value.

15. The UE of claim 10, wherein the execution of the processor executable code further causes the UE to estimate an initial frequency-dependent subband impairment in association with the initialization of the connection with the network node, wherein the initial frequency-dependent subband impairment estimate is the current frequency-dependent subband impairment estimate.

16. The UE of claim 10, wherein the first message is received based on an update and / or periodic scheduling of one or more transmit antennas at the network node, provided that the difference between the current temperature at the network node and the previous temperature at the network node is greater than a temperature threshold.

17. The UE of claim 10, wherein the execution of the processor-executable code further causes the UE to send a second message to the network node instructing the UE of its ability to eliminate the frequency-dependent subband impairment.

18. A method for wireless communication by a network node, the method comprising: The rate of change associated with frequency-dependent subband damage was determined; Receive the first message instructing the user equipment (UE) to eliminate frequency-dependent subband impairments; as well as Based on the rate of change and the UE's ability to eliminate the frequency-dependent subband impairment, a second message is sent indicating a command for updating or maintaining the current frequency-dependent subband impairment estimate.

19. The method of claim 18, further comprising transmitting one or more pilot symbols, wherein the current frequency-dependent subband impairment estimate is associated with the one or more pilot symbols.

20. The method of claim 18, further comprising sending an additional corresponding second message at each of a set of time slots, the additional corresponding second message including a command for updating the corresponding current frequency-dependent subband impairment estimate or a command for maintaining the corresponding current frequency-dependent subband impairment estimate.

21. The method according to claim 18, wherein: The command for updating the current frequency-related subband damage estimate and the command for maintaining the current frequency-related subband damage estimate are associated with the same single bit indicating whether to update or maintain the current frequency-related subband damage estimate; The current frequency-dependent subband impairment estimate is maintained based on the single bit having a first value; and The current frequency-dependent subband impairment estimate is updated based on the single bit having a second value.

22. The method of claim 18, wherein the rate of change is associated with one or more of a temperature threshold, an update of one or more transmit antennas at the network node, and / or periodic scheduling.

23. The method according to claim 22, wherein: If the difference between the current temperature at the network node and the previous temperature at the network node is greater than the temperature threshold, the second message includes the command for updating the current frequency-related subband impairment estimate; and The previous temperature is associated with a time period corresponding to a third message that is sent before the second message, indicating another command for updating previous frequency-related subband damage.

24. The method of claim 23, wherein the one or more transmit antennas are updated according to the network node, and the second message includes the command for updating the current frequency-dependent subband impairment estimate.

25. The method of claim 23, wherein, according to the periodic scheduling, the second message includes the command for updating the current frequency-dependent subband impairment estimate.

26. A network node, the network node comprising: One or more processors; and One or more memories, coupled to and storing processor-executable code, which, when executed by the one or more processors, is configured to cause the network node to: The rate of change associated with frequency-dependent subband damage was determined; Receive a first message instructing the user equipment (UE) to eliminate frequency-dependent subband impairments; and Based on the rate of change and the UE's ability to eliminate the frequency-dependent subband impairment, a second message is sent indicating a command for updating or maintaining the current frequency-dependent subband impairment estimate.

27. The network node of claim 26, wherein the execution of the processor-executable code further causes the network node to transmit one or more pilot symbols, wherein the current frequency-dependent subband impairment estimate is associated with the one or more pilot symbols.

28. The network node of claim 26, wherein the execution of the processor-executable code further causes the network node to send an additional corresponding second message at each of a set of time slots, the additional corresponding second message including a command for updating the corresponding current frequency-dependent subband impairment estimate or a command for maintaining the corresponding current frequency-dependent subband impairment estimate.

29. The network node according to claim 26, wherein: The command for updating the current frequency-related subband damage estimate and the command for maintaining the current frequency-related subband damage estimate are associated with the same single bit indicating whether to update or maintain the current frequency-related subband damage estimate; The current frequency-dependent subband impairment estimate is maintained based on the single bit having a first value; and The current frequency-dependent subband impairment estimate is updated based on the single bit having a second value.

30. The network node of claim 26, wherein the rate of change is associated with one or more of a temperature threshold, an update of one or more transmit antennas at the network node, and / or periodic scheduling.

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