Compensating for transceiver spatial filter asymmetry in the upper millimeter-wave band

Abstract

The present disclosure provides systems, methods, and apparatuses for wireless communication, including computer programs encoded on computer storage media. In one aspect of the present disclosure, a method for wireless communication includes: determining, at a wireless device, a subset of antenna elements from a plurality of antenna elements that will be used to communicate with a network entity in a second communication direction. The plurality of antenna elements are used to communicate with the network entity in a first communication direction. The method further includes: transmitting, from the wireless device to the network entity, a message indicating that the subset of antenna elements will be used to communicate in the second communication direction. Other aspects and features are also claimed and described.

Description

[0001] Cross - Reference to Related Applications

[0002] This application claims the benefit of U.S. Patent Application No. 17 / 245,558, filed Apr. 30, 2021, entitled "COMPENSATING FOR TRANSMIT - RECEIVE SPATIAL FILTER ASYMMETRIES IN UPPER MILLIMETER WAVE BANDS" and U.S. Provisional Patent Application No. 63 / 021,434, filed May 7, 2020, entitled "COMPENSATING FOR TRANSMIT - RECEIVE SPATIAL FILTER ASYMMETRIES IN UPPER MILLIMETER WAVE BANDS", the entire contents of both of which are hereby incorporated by reference in their entirety. Field of the Disclosure

[0003] Aspects of the present disclosure generally relate to wireless communication systems, and more particularly to compensating for transmit - receive spatial filter asymmetries in upper millimeter wave bands. Background Art

[0004] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcasting, etc. These wireless networks can be multi - access networks capable of supporting multiple users by sharing available network resources. Such networks can be multi - access networks that support communication of multiple users by sharing available network resources.

[0005] A wireless communication network can include several components. These components can include wireless communication devices such as a base station (or Node B) that can support communication of multiple user equipments (UEs). The UEs can communicate with the base station via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the base station to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the base station.

[0006] The base station can transmit data and control information to the UE on the downlink, or can receive data and control information from the UE on the uplink. On the downlink, due to transmissions from adjacent base stations or other radio frequency (RF) transmitters, the transmission from the base station may encounter interference. On the uplink, the transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with adjacent base stations or from other radio RF transmitters. This interference can degrade the performance on both the downlink and the uplink.

[0007] As the demand for mobile broadband access continues to increase, and as more UEs access remote wireless communication networks and more short-range wireless systems are deployed in communities, the likelihood of interfering with and congesting the network increases. Research and development continuously drive the development of wireless technologies, not only to meet the growing demand for mobile broadband access, but also to enhance and improve the mobile communication experience of users.

[0008] In a fifth generation (5G) new radio (NR) communication system, particularly in a FR2 5G NR communication system, the antenna array used by a UE for communication in the uplink is typically the same as the antenna array used by the UE for communication in the downlink. For example, the same plurality of antenna elements used by the UE to transmit one or more signals in the uplink can also be used to receive one or more signals in the downlink. Additionally, it is typically assumed that there is uplink and downlink beam correspondence (or a complete lack of uplink and downlink beam correspondence) at the UE. For example, if there is uplink and downlink beam correspondence, the beamformed downlink signal can be used to derive beam weights for use in communication in the uplink, optionally with some calibration and correction. However, as 5G communication systems evolve to include FR4 (e.g., systems operating above 52.6 gigahertz (GHz), also referred to as the upper millimeter wave band), the assumption of using the same antenna array for both the uplink and downlink and the uplink and downlink beam correspondence at the UE may no longer be applicable. SUMMARY OF THE DISCLOSURE

[0009] Some aspects of the present disclosure are outlined below to provide a basic understanding of the technology being discussed. This summary is not an extensive review of all the expected features of the present disclosure and is neither intended to identify the key or important elements of all aspects of the present disclosure nor to describe the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in an overview form as a prelude to the more detailed description presented later.

[0010] In one aspect of the present disclosure, a method for wireless communication includes: determining, at a user equipment (UE), a subset of antenna elements among a plurality of antenna elements to be used for communicating with a network entity in a second communication direction. The plurality of antenna elements are used for communicating with the network entity in a first communication direction. The method further includes: transmitting, from the UE to the network entity, a message indicating that the subset of antenna elements will be used for communication in the second communication direction.

[0011] In an additional aspect of the present disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to determine, at a user equipment (UE), a subset of antenna elements from a plurality of antenna elements that will be used to communicate with a network entity in a second communication direction. The plurality of antenna elements are used to communicate with the network entity in a first communication direction. The at least one processor is further configured to initiate transmission of a message from the UE to the network entity, the message indicating that the subset of antenna elements will be used to communicate in the second communication direction.

[0012] In an additional aspect of the present disclosure, an apparatus configured for wireless communication is disclosed. The apparatus includes means for determining, at a user equipment (UE), a subset of antenna elements from a plurality of antenna elements that will be used to communicate with a network entity in a second communication direction. The plurality of antenna elements are used to communicate with the network entity in a first communication direction. The apparatus further includes means for transmitting, from the UE to the network entity, a message indicating that the subset of antenna elements will be used to communicate in the second communication direction.

[0013] In an additional aspect of the present disclosure, a non-transitory computer-readable medium stores instructions that, when executed by a processor, cause the processor to perform operations including: determining, at a user equipment (UE), a subset of antenna elements from a plurality of antenna elements that will be used to communicate with a network entity in a second communication direction. The plurality of antenna elements are used to communicate with the network entity in a first communication direction. The operations further include: initiating transmission of a message from the UE to the network entity, the message indicating that the subset of antenna elements will be used to communicate in the second communication direction.

[0014] In an additional aspect of the present disclosure, a method for wireless communication includes: receiving, at a network entity, from a user equipment (UE), a message indicating that a subset of antenna elements from a plurality of antenna elements will be used by the UE to communicate with the network entity in a second communication direction. The plurality of antenna elements are used by the UE to communicate with the network entity in a first communication direction. The method further includes: transmitting, from the network entity to the UE, an authorization message indicating that the UE is permitted to use the subset of antenna elements to communicate in the second communication direction.

[0015] In an additional aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured to receive, at a network entity, a message from a user equipment (UE) indicating that a subset of antenna elements among a plurality of antenna elements is to be used by the UE to communicate with the network entity in a second communication direction. The plurality of antenna elements are used by the UE to communicate with the network entity in a first communication direction. The at least one processor is further configured to initiate transmission of an authorization message from the network entity to the UE, the authorization message indicating that the UE is permitted to use the subset of antenna elements to communicate in the second communication direction.

[0016] In an additional aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes means for receiving, at a network entity, a message from a user equipment (UE) indicating that a subset of antenna elements among a plurality of antenna elements is to be used by the UE to communicate with the network entity in a second communication direction. The plurality of antenna elements are used by the UE to communicate with the network entity in a first communication direction. The device further includes means for transmitting an authorization message from the network entity to the UE, the authorization message indicating that the UE is permitted to use the subset of antenna elements to communicate in the second communication direction.

[0017] In an additional aspect of the present disclosure, a non-transitory computer-readable medium stores instructions that, when executed by a processor, cause the processor to perform operations including: receiving, at a network entity, a message from a user equipment (UE) indicating that a subset of antenna elements among a plurality of antenna elements is to be used by the UE to communicate with the network entity in a second communication direction. The plurality of antenna elements are used by the UE to communicate with the network entity in a first communication direction. The operations further include: initiating transmission of an authorization message from the network entity to the UE, the authorization message indicating that the UE is permitted to use the subset of antenna elements to communicate in the second communication direction.

[0018] By reading the following description of specific exemplary aspects in conjunction with the accompanying drawings, other aspects, features, and implementations will become apparent to those of ordinary skill in the art. Although certain aspects and the accompanying drawings may be referred to in discussing features, each aspect may include one or more of the advantageous features discussed herein. In other words, although one or more aspects may be described as having certain advantageous features, one or more of such features may also be used in accordance with various aspects. In a similar manner, although the exemplary aspects may be described below as device, system, or method aspects, the exemplary aspects may be implemented in various devices, systems, and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] A further understanding of the nature and advantages of the present disclosure can be realized by referring to the following drawings. In the drawings, like parts or features may have the same reference numerals. Additionally, each of the same type of parts can be distinguished by adding a dash after the reference numeral and a second mark for differentiating between similar parts. If only the first reference numeral is used in the specification, the description applies to any one of the similar parts having the same first reference numeral, regardless of the second reference numeral.

[0020] Figure 1 is a block diagram illustrating details of an example wireless communication system according to one or more aspects.

[0021] Figure 2 is a block diagram illustrating examples of a base station and a user equipment (UE) according to one or more aspects.

[0022] Figure 3 is a block diagram illustrating an example wireless communication system that supports compensating for transceiver space filter asymmetry according to one or more aspects.

[0023] Figure 4A and Figure 4B illustrate an example configuration of an antenna array of a UE according to one or more aspects.

[0024] Figure 5 is a flowchart illustrating an example process of UE operation for communication according to one or more aspects.

[0025] Figure 6 is a flowchart illustrating an example process of network entity operation for communication according to one or more aspects.

[0026] Figure 7 is a block diagram of an example UE that supports compensating for transceiver space filter asymmetry according to one or more aspects.

[0027] Figure 8 is a block diagram of an example network entity that supports compensating for transceiver space filter asymmetry according to one or more aspects. Detailed Description

[0028] The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to limit the scope of the present disclosure. On the contrary, the detailed description includes specific details for the purpose of providing a thorough understanding of the subject matter of the present invention. It will be apparent to those skilled in the art that these specific details are not required in every case and, in some instances, well-known structures and components are shown in block diagram form for clarity of presentation.

[0029] The present disclosure provides systems, apparatuses, methods, and computer-readable media that support compensating for transceiver spatial filter asymmetries in upper millimeter wave bands such as greater than 52.6 GHz. For example, the systems, apparatuses, methods, and computer-readable media described herein can be configured to enable a wireless device such as a user equipment (UE) to communicate in an uplink (or downlink) direction using a subset of multiple antenna elements used for communicating in a downlink (or uplink) direction, such that uplink and downlink beam correspondence can be at least partially maintained and achieved with fewer processing resources and less power consumption compared to a situation where there is a complete lack of uplink and downlink beam correspondence at the wireless device. As further described herein, because the antenna elements used for communicating in the uplink (or downlink) are a subset of the antenna elements used for communicating in the downlink (or uplink), spatial filter asymmetries in the uplink and downlink (e.g., differences in beamforming weights enabling communication) can be compensated for.

[0030] For example, a UE can determine that a subset of antenna elements will be used to communicate with a network entity such as a base station in a second communication direction. The subset of antenna elements is a subset (e.g., a proper subset) of the multiple antenna elements that the UE uses to communicate with the network entity in a first communication direction. In some implementations, the first communication direction is opposite to the second communication direction. As one example, the first communication direction can be the downlink direction and the second communication direction can be the uplink direction. As an alternative example, the first communication direction can be the uplink direction and the second communication direction can be the downlink direction.

[0031] After determining (e.g., identifying) the subset of antenna elements, the UE transmits a message to the network entity that indicates that the subset of antenna elements will be used to communicate in the second communication direction. In some implementations, an indication of the subset of antenna elements is included in the message. Alternatively, the message can indicate the use of a different antenna array in the second communication direction than in the first communication direction, and the message can either not indicate a lack of beam correspondence between the first and second communication directions or can indicate a hybrid-mode beam correspondence between the first and second communication directions. For example, the message can include a multi-bit field such as a UE capability field that indicates a state different from a state corresponding to a lack of beam correspondence (e.g., no beam correspondence) and a state corresponding to beam correspondence (e.g., full beam correspondence).

[0032] Based on receiving a message from the UE, a network entity may transmit an authorization message to the UE, and the authorization message indicates that the UE is allowed to communicate in a second communication direction using a subset of antenna elements. Based on receiving the authorization message from the network entity, the UE may perform one or more communications with the network entity in the second communication direction using the subset of antenna elements. Because there is not a complete lack of beam correspondence between the first communication direction and the second communication direction, a second set of beamforming weights applied by the UE to communications in the second communication direction may be a subset (e.g., a proper subset) of a first set of beamforming weights applied by the UE to communications in the first communication direction. Optionally, the UE may perform one or more calibration operations on the second set of beamforming weights before applying the second set of beamforming weights to communications in the second communication direction. Alternatively, the UE may receive one or more channel state information reference signals (CSI-RS) from the network entity based on transmitting the message, and the UE may generate a set of beamforming weights for communicating in the second communication direction based on one or more beam measurement operations performed on the one or more CSI-RS.

[0033] Specific implementations of the subject matter described in this disclosure may be implemented to achieve one or more of the following potential advantages. In some aspects, this disclosure provides techniques for compensating for spatial filter asymmetry at a UE. For example, although there is no one-to-one correspondence between a first set of beamforming weights used by the UE for communicating in a first communication direction and a second set of beamforming weights used by the UE for communicating in a second communication direction, the second set of beamforming weights is a subset of the first set of beamforming weights such that each beamforming weight included in the second set of beamforming weights is also included in the first set of beamforming weights. Using a subset of the first beamforming weights for communications in the second communication direction enables the UE to determine the second set of beamforming weights without performing beam measurements on signals communicated in the second communication direction, thereby increasing the speed for determining the second set of beamforming weights and reducing processing resources. Additionally, if the second communication direction is an uplink direction, using fewer antenna elements in the second communication direction uses fewer power amplifiers (e.g., in the transmit path of the antenna elements), thereby reducing power consumption at the UE. This may also reduce thermal overshoot because less power is consumed and dissipated at the UE.

[0034] The present disclosure generally relates to providing or participating in authorized shared access between two or more wireless devices in one or more wireless communication systems (also referred to as wireless communication networks). In various implementations, the techniques and apparatus can be used in wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, Single-Carrier FDMA (SC-FDMA) networks, Long-Term Evolution (LTE) networks, Global System for Mobile Communications (GSM) networks, Fifth Generation (5G) or New Radio (NR) networks (sometimes referred to as "5G NR" networks, systems or devices), and other communication networks. As used herein, the terms "network" and "system" may be used interchangeably.

[0035] For example, CDMA networks may implement wireless technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband CDMA (W-CDMA) and Low Chip Rate (LCR). CDMA2000 covers the IS-2000, IS-95 and IS-856 standards.

[0036] For example, TDMA networks may implement radio technologies such as the Global System for Mobile Communications (GSM). The Third Generation Partnership Project (3GPP) defines the standards for the GSM EDGE (Enhanced Data Rates for GSM Evolution) Radio Access Network (RAN), also known as GERAN. GERAN is the radio component of GSM / EDGE and the network connecting base stations (e.g., Ater and Abis interfaces) and base station controllers (A interface, etc.). The radio access network represents the components of a GSM network through which telephone calls and packet data are routed from the Public Switched Telephone Network (PSTN) and the Internet to subscriber handsets, also known as user terminals or User Equipment (UE), or from subscriber handsets to the PSTN and the Internet. The network of a mobile phone operator may include one or more GERANs, which may be coupled to the UTRAN in the case of a UMTS / GSM network. In addition, the operator network may also include one or more LTE networks or one or more other networks. Various different network types may use different Radio Access Technologies (RATs) and Radio Access Networks (RANs).

[0037] OFDMA networks can implement radio technologies such as evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM, etc. UTRA, E-UTRA, and GSM are part of the Universal Mobile Telecommunications System (UMTS). Specifically, Long-Term Evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents provided by an organization called the "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents provided by an organization called the "3rd Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are known or are being developed. For example, 3GPP is a cooperation among groups of telecommunications associations that aims to define globally applicable third-generation (3G) mobile phone specifications. 3GPP LTE is a 3GPP project that aims to improve the UMTS mobile phone standard. 3GPP can define specifications for next-generation mobile networks, mobile systems, and mobile devices. Certain aspects of the present disclosure may be described with reference to LTE, 4G, or 5G NR technologies; however, the description is not intended to be limited to a specific technology or application, and one or more aspects described with reference to one technology may be understood to apply to another technology. Additionally, one or more aspects of the present disclosure may relate to shared access to the wireless spectrum between networks using different radio access technologies or radio air interfaces.

[0038] 5G networks contemplate diversity deployments, diversity spectrums, and diversity services and devices that can be implemented using an OFDM-based unified air interface. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also contemplated. 5G NR will be able to scale to cover: (1) massive Internet of Things (IoTs) with ultra-high density (e.g., ~1M nodes / km 2 ), ultra-low complexity (e.g., ~10s of bits / second), ultra-low energy (e.g., ~10+ years of battery life), and deep coverage capable of reaching challenging locations; (2) mission-critical control including strong security to protect sensitive personal, financial, or classified information, ultra-high reliability (e.g., ~99.9999% reliability), ultra-low latency (e.g., ~1 millisecond (ms)), and users with a wide range of mobility or lack of mobility; and (3) enhanced mobile broadband including extremely high capacity (e.g., ~10 Tbps / km 2 ), extremely high data rates (e.g., multi-Gbps rates, 100+ Mbps user experience rate), and deep awareness for advanced discovery and optimization.

[0039] Devices, networks, and systems can be configured to communicate via one or more portions of the electromagnetic spectrum. The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc. based on frequency or wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz – 7.125 GHz) and FR2 (24.25 GHz – 52.6 GHz). Frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, in various documents and articles, FR1 is typically (interchangeably) referred to as the "sub-6GHz" band. FR2 sometimes encounters a similar naming issue. Although it is different from the extremely high frequency (EHF) band (30 GHz – 300 GHz) identified by the International Telecommunication Union (ITU) as the "millimeter wave (mmWave)" band, in documents and articles, it is typically (interchangeably) referred to as the "mmWave" band.

[0040] Taking into account the above aspects, unless otherwise specified, it should be understood that terms such as "sub-6GHz" (if used in this document) can broadly represent frequencies below 6 GHz, can be within FR1, or can include mid-band frequencies. Additionally, unless otherwise specified, it should be understood that terms such as "mmWave" (if used in this document) can broadly represent frequencies that can include mid-band frequencies, can be within FR2, or can be within the EHF band.

[0041] 5G NR devices, networks, and systems can be implemented using optimized OFDM-based waveform features. These features can include: scalable numerology and transmission time intervals (TTIs); a common, flexible framework to efficiently multiplex services and features in dynamic, low-latency time-division duplex (TDD) or low-latency frequency-division duplex (FDD) designs; and advanced radio technologies such as massive multiple-input multiple-output (MIMO), robust mmWave transmission, advanced channel coding, and device-centric mobility. The scalability of numerology in 5G NR and the expansion of subcarrier spacing can effectively address the operation of diverse services across diverse spectra and diverse deployments. For example, in various outdoor and macro-coverage deployments with FDD or TDD implementations below 3 GHz, the subcarrier spacing can occur at 15 kHz, e.g., over bandwidths of 1, 5, 10, 20 MHz, etc. For other various outdoor and small-cell coverage deployments with TDD above 3 GHz, the subcarrier spacing can occur at 30 kHz over an 80 / 100 MHz bandwidth. For other various indoor broadband implementations using TDD in the unlicensed portion of the 5 GHz band, the subcarrier spacing can occur at 60 kHz over a 160 MHz bandwidth. Finally, for various deployments transmitting mmWave components with TDD at 28 GHz, the subcarrier spacing can occur at 120 kHz over a 500 MHz bandwidth.

[0042] The scalable numerology of 5G NR enables scalable TTIs for diverse latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. The effective multiplexing of long and short TTIs allows transmissions to start at symbol boundaries. 5G NR also considers a self-contained integrated subframe design, where uplink or downlink scheduling information, data, and acknowledgments are in the same subframe. The self-contained integrated subframe supports communication in unlicensed or contention-based shared spectra, adaptive uplink or downlink, which can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current traffic demands.

[0043] For clarity, certain aspects of the apparatus and techniques may be described below with reference to example 5G NR implementations or in a 5G-centric manner, and in the sections described below, 5G terminology may be used as illustrative examples; however, the description is not intended to be limited to 5G applications.

[0044] Moreover, it should be understood that in operation, a wireless communication network adapted according to the concepts herein can operate on any combination of licensed or unlicensed spectrum depending on load and availability. Thus, it will be apparent to those of ordinary skill in the art that the systems, apparatuses, and methods described herein can be applied to other communication systems and applications different from the specific examples provided.

[0045] Although multiple aspects and various implementations are described in this application by way of illustration of some examples, those skilled in the art will understand that additional implementations and use cases can arise in many different arrangements and scenarios. The innovations described herein can be implemented across many different platform types, devices, systems, shapes, sizes, packaging arrangements. For example, the implementation or use can be achieved via an integrated chip or other non-module-component-based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial devices, retail devices or point-of-purchase devices, medical devices, AI-enabled devices, etc.). Although some examples may or may not be specifically targeted at a use case or application, a wide variety of applicability of the described innovations can arise. The scope of implementation can range from chip-level or modular components to non-modular, non-chip-level implementations, and further to aggregated, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more of the described aspects. In some practical settings, devices incorporating the described aspects and features may also need to include additional components and features for implementing and practicing the claimed and described aspects. It is intended that the innovations described herein can be practiced in a wide variety of implementations, including large or small devices, chip-level components, multi-component systems (e.g., radio frequency (RF) chains, communication interfaces, processors) of different sizes, shapes, and configurations, distributed arrangements, end-user devices, etc.

[0046] Figure 1 is a block diagram illustrating details of an example wireless communication system according to one or more aspects. The wireless communication system can include a wireless network 100. For example, the wireless network 100 can include a 5G wireless network. As those skilled in the art will understand, Figure 1 the components presented therein may have relevant counterparts in other network arrangements including, for example, cellular network arrangements and non-cellular network arrangements (e.g., device-to-device or peer-to-peer or ad-hoc network arrangements, etc.).

[0047] Figure 1The illustrated wireless network 100 includes multiple base stations 105 and other network entities. A base station can be a station that communicates with a UE and can also be referred to as an evolved Node B (eNB), a next-generation eNB (gNB), an access point, etc. Each base station 105 can provide communication coverage for a specific geographical area. In 3GPP, the term "cell" can refer to the specific geographical coverage area of a base station or the base station subsystem serving that coverage area, depending on the context in which the term is used. In the implementation of the wireless network 100 herein, the base stations 105 can be associated with the same operator or different operators (e.g., the wireless network 100 can include multiple operator wireless networks). Additionally, in the implementation of the wireless network 100 herein, the base stations 105 can use one or more of the same frequencies as adjacent cells (e.g., one or more frequency bands in licensed spectrum, unlicensed spectrum, or a combination thereof) to provide wireless communication. In some examples, a single base station 105 or UE 115 can be operated by more than one network operation entity. In some other examples, each base station 105 and UE 115 can be operated by a single network operation entity.

[0048] A base station can provide communication coverage for a macro cell or a small cell such as a pico cell or a femto cell or other types of cells. A macro cell typically covers a relatively large geographical area (e.g., with a radius of several kilometers) and can allow unrestricted access by UEs that have subscribed to services from the network provider. A small cell such as a pico cell typically covers a relatively small geographical area and can allow unrestricted access by UEs that have subscribed to services from the network provider. A small cell such as a femto cell typically also covers a relatively small geographical area (e.g., a home) and can provide restricted access in addition to unrestricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). The base station of a macro cell can be referred to as a macro base station. The base station of a small cell can be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In Figure 1 the illustrated example, base stations 105d and 105e are conventional macro base stations, while base stations 105a - 105c are macro base stations that support one of three-dimensional (3D), full-dimensional (FD), or massive MIMO. Base stations 105a - 105c utilize their higher-dimensional MIMO capabilities to increase coverage and capacity using 3D beamforming in both elevation beamforming and azimuth beamforming. Base station 105f is a small cell base station, which can be a home node or a portable access point. A base station can support one or more (e.g., two, three, four, etc.) cells.

[0049] Wireless network 100 may support synchronous or asynchronous operations. For synchronous operations, base stations may have similar frame timings, and transmissions from different base stations may be approximately aligned in time. For asynchronous operations, base stations may have different frame timings, and transmissions from different base stations may not be aligned in time. In some cases, the network may be enabled or configured to handle dynamic switching between synchronous and asynchronous operations.

[0050] UEs 115 are dispersed throughout wireless network 100, and each UE may be fixed or mobile. It should be understood that although in the standards and specifications released by 3GPP, mobile devices are generally referred to as UEs, those skilled in the art may also refer to such devices as mobile stations (MS), user stations, mobile units, subscriber units, radio units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals (AT), mobile terminals, wireless terminals, remote terminals, cell phones, terminals, user agents, mobile clients, clients, gaming devices, augmented reality devices, vehicle components, vehicle devices, or vehicle modules, or some other suitable terms. In this document, a "mobile" device or UE does not necessarily need to have the ability to move and may be fixed. Some non-limiting examples of mobile devices may include implementations that include one or more UEs 115, including mobile phones, cellular (mobile) phones, smart phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, laptop computers, personal computers (PCs), notebooks, netbooks, smartbooks, tablets, and personal digital assistants (PDAs). Mobile devices may also be: Internet of Things or "Internet of Everything" (IoE) devices, such as cars or other transportation vehicles, satellite radios, global positioning system (GPS) devices, global navigation satellite system (GNSS) devices, logistics controllers, drones, multi-axis aircraft, quadcopters, smart energy or security devices, solar panels or solar cell arrays, municipal lighting, water, or other infrastructure; industrial automation and enterprise equipment; consumer and wearable devices, such as glasses, wearable cameras, smart watches, health or fitness trackers, mammalian implantable devices, gesture tracking devices, medical devices, digital audio players (e.g., MP3 players), cameras, gaming consoles, etc.; and digital home or smart home devices, such as home audio, video, and multimedia devices, appliances, sensors, vending machines, smart lighting, home security systems, smart meters, etc. In one aspect, a UE may be a device that includes a universal integrated circuit card (UICC). In another aspect, a UE may be a device that does not include a UICC. In some aspects, a UE that does not include a UICC may also be referred to as an IoE device. Figure 1The illustrated UEs 115a - 115d are examples of mobile smart phone - type devices that access the wireless network 100. A UE can also be a machine specifically configured for connectivity communications, including machine - type communications (MTC), enhanced MTC (eMTC), narrow - band IoT (NB - IoT), etc. Figure 1 The illustrated UEs 115e - 115k are examples of various machines configured for communications that access the wireless network 100.

[0051] Mobile devices such as UE 115 can communicate with any type of base station, whether macro - base station, pico - base station, femto - base station, relay station, etc. In Figure 1 it, the communication link (represented as lightning) indicates a wireless transmission between the UE and the serving base station (which is the base station designated to serve the UE on the downlink or uplink), or a desired transmission between base stations and a backhaul transmission between base stations. In some cases, a UE can operate as a base station or other network node. Backhaul communication between the base stations of the wireless network 100 can be carried out using wired or wireless communication links.

[0052] In the operation of the wireless network 100, base stations 105a - 105c use 3D beamforming and collaborative spatial techniques such as coordinated multi - point (CoMP) or multi - connection to serve UEs 115a and 115b. Macro - base station 105d performs backhaul communication with base stations 105a - 105c and small - cell base station 105f. Macro - base station 105d also transmits multicast services subscribed to and received by UEs 115c and 115d. Such multicast services can include mobile TV or streaming video, or can include other services for providing community information, such as weather emergencies or alerts, e.g., amber alerts or gray alerts.

[0053] The implemented wireless network 100 supports mission-critical communication with ultra-reliable and redundant links for mission-critical devices such as UE 115e which is a drone. The redundant communication links with UE 115e include from macro base stations 105d and 105e and small cell base station 105f. Other machine type devices such as UE 115f (thermometer), UE 115g (smart meter), and UE 115h (wearable device) can communicate through the wireless network 100, either directly with base stations such as small cell base station 105f and macro base station 105e, or communicate in a multi-hop configuration by communicating with another user device such as UE 115f that relays its information to the network. UE 115f communicates temperature measurement information to the smart meter UE 115g, and the temperature measurement information is then reported to the network through small cell base station 105f. The wireless network 100 can also provide additional network efficiency through dynamic, low-latency TDD communication or low-latency FDD communication, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i - 115k communicating with macro base station 105e.

[0054] Figure 2 is a block diagram illustrating an example of base station 105 and UE 115 according to one or more aspects. Base station 105 and UE 115 can be Figure 1 any one of the base stations and UEs in. For the restricted association scenario (as described above), base station 105 can be Figure 1 the small cell base station 105f in, and UE 115 can be UE 115c or 115d operating in the service area of base station 105f, which will be included in the list of accessible UEs of small cell base station 105f for accessing small cell base station 105f. Base station 105 can also be some other type of base station. As Figure 2 shown, base station 105 can be equipped with antennas 234a to 234t, and UE 115 can be equipped with antennas 252a to 252r to facilitate wireless communication.

[0055] At base station 105, transmit processor 220 may receive data from data source 212 and control information from controller 240, such as a processor. The control information may be used for Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid ARQ (Automatic Repeat reQuest) Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Enhanced Physical Downlink Control Channel (EPDCCH), Machine-Type Communication (MTC) Physical Downlink Control Channel (MPDCCH), etc. The data may be used for Physical Downlink Shared Channel (PDSCH), etc. Additionally, transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 220 may also generate reference symbols, such as for Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS), and cell-specific reference signals. If applicable, Transmit (TX) MIMO processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, or reference symbols, and may provide output symbol streams to modulators (MOD) 232a through 232t. For example, the spatial processing performed on the data symbols, control symbols, or reference symbols may include precoding. Each modulator 232 may process the corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may additionally or alternatively process the output sample stream (e.g., convert to analog, amplify, filter, and up-convert) to obtain a downlink signal. The downlink signals from modulators 232a through 232t may be transmitted via antennas 234a through 234t, respectively.

[0056] At user equipment (UE) 115, antennas 252a through 252r may receive the downlink signals from base station 105 and may provide the received signals to demodulators (DEMOD) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, down-convert, and digitize) the corresponding received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 may obtain the received symbols from demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide the detected symbols. Receive processor 258 may process (e.g., demodulate, de-interleave, and decode) the detected symbols, provide the decoded data of UE 115 to data sink 260, and provide the decoded control information to controller 280, such as a processor.

[0057] On the uplink, at the UE 115, the transmit processor 264 can receive and process data from the data source 262 (e.g., for the physical uplink shared channel (PUSCH)) and control information from the controller 280 (e.g., for the physical uplink control channel (PUCCH)). In addition, the transmit processor 264 can also generate reference symbols for reference signals. If applicable, the symbols from the transmit processor 264 can be precoded by the TX MIMO processor 266, further processed by the modulators 254a to 254r (e.g., for SC-FDM, etc.), and transmitted to the base station 105. At the base station 105, the uplink signal from the UE 115 can be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 if applicable, and further processed by the receive processor 238 to obtain the decoded data and control information delivered by the UE 115. The receive processor 238 can provide the decoded data to the data sink 239 and the decoded control information to the controller 240.

[0058] The controllers 240 and 280 can direct the operations at the base station 105 and the UE 115, respectively. Other processors and modules at the controller 240 or the base station 105 or other processors and modules at the controller 280 or the UE 115 can perform or direct the running of the various processes of the techniques described herein, such as performing or directing Figures 5 to 6 the operations shown in, or other processes of the techniques described herein. The memories 242 and 282 can store the data and program codes of the base station 105 and the UE 115, respectively. The scheduler 244 can schedule the UE for data transmission on the downlink or the uplink.

[0059] Wireless communication systems operated by different network operating entities (e.g., network operators) can share the spectrum. In some cases, a network operating entity can be configured to use the entire specified shared spectrum for at least a period of time before another network operating entity uses the entire specified shared spectrum in a different time period. Thus, in order to allow a network operating entity to use the entire specified shared spectrum and to mitigate interfering communications between different network operating entities, certain resources (e.g., time) can be partitioned and allocated to different network operating entities for certain types of communications.

[0060] For example, a network operation entity may be allocated certain time resources reserved for dedicated communication by that network operation entity using the entire shared spectrum. The network operation entity may also be allocated other time resources, where the entity is given a higher priority than other network operation entities to use the shared spectrum for communication. If the prioritized network operation entity does not utilize these resources, these time resources prioritized for use by the network operation entity may be utilized by other network operation entities on an opportunistic basis. Additional time resources may be allocated to any network operator for use on an opportunistic basis.

[0061] Access to the shared spectrum and arbitration of time resources among different network operation entities may be centrally controlled by a separate entity, determined autonomously by a predefined arbitration scheme, or determined dynamically based on interactions between wireless nodes of network operators.

[0062] In some cases, UE 115 and base station 105 may operate in a shared radio frequency spectrum band, which may include licensed or unlicensed (e.g., contention-based) spectrum. In the unlicensed frequency portion of the shared radio frequency spectrum band, UE 115 or base station 105 may traditionally perform a medium sensing procedure to compete for access to the spectrum. For example, UE 115 or base station 105 may perform a listen-before-talk or listen-before-transmit (LBT) procedure such as clear channel assessment (CCA) prior to communication to determine whether the shared channel is available. In some implementations, CCA may include an energy detection procedure to determine whether there are any other active transmissions. For example, a device may infer that a change in the received signal strength indicator (RSSI) of a power meter indicates that the channel is occupied. Specifically, signal power concentrated in a certain bandwidth and exceeding a predetermined noise floor may indicate another wireless transmitter. CCA may also include detection of a specific sequence indicating the use of the channel. For example, another device may transmit a specific preamble prior to transmitting a data sequence. In some cases, the LBT procedure may include a wireless node adjusting its own backoff window based on the amount of energy detected on the channel or acknowledgement / negative acknowledgement (ACK / NACK) feedback for its own transmitted packets as a proxy for contention.

[0063] The present disclosure provides systems, apparatuses, methods, and computer-readable media that support compensating for transceiver spatial filter asymmetries in upper millimeter wave bands such as greater than 52.6 GHz. For example, the systems, apparatuses, methods, and computer-readable media described herein can be configured to enable a wireless device such as a UE to communicate in an uplink (or downlink) direction using a subset of multiple antenna elements used for communicating in a downlink (or uplink) direction, such that uplink and downlink beam correspondence can be at least partially maintained, and can be achieved with fewer processing resources, less power consumption, and less thermal overshoot compared to a situation where there is a complete lack of uplink and downlink beam correspondence at the wireless device. As further described herein, because the antenna elements used for communicating in the uplink (or downlink) are a subset of the antenna elements used for communicating in the downlink (or uplink), spatial filter asymmetries in the uplink and downlink (e.g., differences in beamforming weights enabling communication) can be compensated for.

[0064] For example, a UE can determine that a subset of antenna elements will be used to communicate with a network entity such as a base station in a second communication direction. The subset of antenna elements is a subset (e.g., a proper subset) of the multiple antenna elements that the UE uses to communicate with the network entity in a first communication direction. In some implementations, the first communication direction is opposite to the second communication direction. As one example, the first communication direction can be a downlink direction and the second communication direction can be an uplink direction. As an alternative example, the first communication direction can be an uplink direction and the second communication direction can be a downlink direction.

[0065] After determining (e.g., identifying) the subset of antenna elements, the UE transmits a message to the network entity that indicates that the subset of antenna elements will be used to communicate in the second communication direction. In some implementations, an indication of the subset of antenna elements is included in the message. Alternatively, the message can indicate the use of a different antenna array in the second communication direction than in the first communication direction, and the message can either not indicate a lack of beam correspondence between the first and second communication directions or can indicate a hybrid-mode beam correspondence between the first and second communication directions. For example, the message can include a multi-bit field such as a UE capability field that indicates a state different from a state corresponding to a lack of beam correspondence (e.g., no beam correspondence) and a state corresponding to beam correspondence (e.g., full beam correspondence).

[0066] Based on receiving a message from the UE, a network entity may transmit an authorization message to the UE, and the authorization message indicates that the UE is allowed to communicate in a second communication direction using a subset of antenna elements. Based on receiving the authorization message from the network entity, the UE may perform one or more communications with the network entity in the second communication direction using the subset of antenna elements. Because there is not a complete lack of beam correspondence between the first communication direction and the second communication direction, a second set of beamforming weights applied by the UE to communications in the second communication direction may be a subset (e.g., a proper subset) of a first set of beamforming weights applied by the UE to communications in the first communication direction. Optionally, the UE may perform one or more calibration operations on the second set of beamforming weights before applying the second set of beamforming weights to communications in the second communication direction. Alternatively, the UE may receive one or more channel state information reference signals (CSI-RS) from the network entity based on transmitting the message, and the UE may generate a set of beamforming weights for communicating in the second communication direction based on one or more beam measurement operations performed on the one or more CSI-RS.

[0067] Specific implementations of the subject matter described in this disclosure may be implemented to achieve one or more of the following potential advantages. In some aspects, this disclosure provides techniques for compensating for spatial filter asymmetry at a UE. For example, although there is no one-to-one correspondence between a first set of beamforming weights used by the UE for communicating in a first communication direction and a second set of beamforming weights used by the UE for communicating in a second communication direction, the second set of beamforming weights is a subset of the first set of beamforming weights such that each beamforming weight included in the second set of beamforming weights is also included in the first set of beamforming weights. Using a subset of the first beamforming weights for communications in the second communication direction enables the UE to determine the second set of beamforming weights without performing beam measurements on signals communicated in the second communication direction, thereby improving the speed for determining the second set of beamforming weights and reducing processing resources. Further, if the second communication direction is an uplink direction, using fewer antenna elements in the second communication direction uses fewer power amplifiers (e.g., in the transmit path of the antenna elements), thereby reducing power consumption at the UE. Additionally, thermal constraints may also be reduced because less power is consumed and dissipated at the UE.

[0068] Figure 3is a block diagram of an example wireless communication system 300 that supports compensating for transceiver spatial filter asymmetry according to one or more aspects. In some implementations, the wireless communication system 300 may implement multiple aspects of the wireless network 100. The wireless communication system 300 includes a UE 115 and a network entity 350. As an illustrative, non-limiting example, the network entity 350 may include or correspond to a base station such as the base station 105, a network, a network core, or another network device. Although one UE 115 and one network entity 350 are illustrated, in some other implementations, the wireless communication system 300 may generally include multiple UE 115s and may include more than one network entity 350. Although described as a UE 115 in Figure 3 , in some other implementations, the operations described with reference to the UE 115 may be performed by other types of wireless devices, as non-limiting examples, such as client devices (CPEs), repeaters, relay nodes, and integrated access backhaul (IAB) nodes, which may benefit from reduced thermal constraints.

[0069] The UE 115 may include various components (such as structures, hardware components) for performing one or more functions described herein. For example, these components may include a processor 302, a memory 304, an antenna array 310, a transmitter 316, and a receiver 318. The processor 302 may be configured to run instructions stored in the memory 304 to perform the operations described herein. In some implementations, the processor 302 includes or corresponds to the controller 280, and the memory 304 includes or corresponds to the memory 282.

[0070] The memory 304 may be configured to store beamforming weights 306, calibration data 309, or a combination thereof. The UE 115 may apply the beamforming weights 306 to signals to be communicated in a particular communication direction to enable communication of the signals via beamforming (such as via one or more elements of the antenna array 310). In some implementations, as further described herein, the beamforming weights 306 may be applied to communication in a first communication direction, and a subset 308 of the beamforming weights 306 may be applied to communication in a second communication direction.

[0071] The calibration data 309 may include data that enables the UE 115 to perform one or more calibration operations on the beamforming weights used in a first communication direction to calibrate the beamforming weights used in a second communication direction. For example, as a non-limiting example, the calibration data 309 may represent the differences between the components of the communication path corresponding to the first communication direction and the components of the communication path corresponding to the second communication direction, such as the differences between the components of the receive path and the components of the transmit path.

[0072] The transmitter 316 is configured to transmit reference signals, control information, and data to one or more other devices, and the receiver 318 is configured to receive reference signals, synchronization signals, control information, and data from one or more other devices. For example, via a network such as a wired network, a wireless network, or a combination thereof, the transmitter 316 can transmit signaling, control information, and data, and the receiver 318 can receive signaling, control information, and data. For example, the UE 115 can be configured to transmit or receive signaling, control information, and data via a direct device-to-device connection, a local area network (LAN), a wide area network (WAN), a modem-to-modem connection, the Internet, an intranet, an extranet, a cable transmission system, a cellular communication network, any combination of the foregoing, or any other communication network now known or later developed that permits two or more electronic devices to communicate therein. In some implementations, the transmitter 316 and the receiver 318 can be integrated in a transceiver. Additionally or alternatively, the transmitter 316, the receiver 318, or both can include and correspond to one or more components of the UE 115 described with reference to Figure 2 and correspond to one or more components of the UE 115 described with reference to

[0073] The antenna array 310 can be configured to transmit or receive signaling, control information, and data from one or more other devices such as the network entity 350. The antenna array 310 includes a plurality of antenna elements 312. Each antenna element of the plurality of antenna elements 312 can be configured to transmit or receive a signal or a portion thereof. In some implementations, the plurality of antenna elements 312 can be configured to enable beamforming for communication via the plurality of antenna elements. In some implementations, as further described herein, the plurality of antenna elements 312 are configured to communicate in a first communication direction, and a subset of antenna elements 314 (e.g., a subset of the plurality of antenna elements 312) is configured to communicate in a second communication direction.

[0074] The network entity 350 can include various components (such as structures, hardware components) for performing one or more functions described herein. For example, these components can include a processor 352, a memory 354, a transmitter 356, and a receiver 358. The processor 352 can be configured to run instructions stored in the memory 354 to perform the operations described herein. In some implementations, the processor 352 includes or corresponds to the controller 240, and the memory 354 includes or corresponds to the memory 242.

[0075] The transmitter 356 is configured to transmit reference signals, synchronization signals, control information, and data to one or more other devices, and the receiver 358 is configured to receive reference signals, control information, and data from one or more other devices. For example, via a network such as a wired network, a wireless network, or a combination thereof, the transmitter 356 may transmit signaling, control information, and data, and the receiver 358 may receive signaling, control information, and data. For example, the network entity 350 may be configured to transmit or receive data via a direct device-to-device connection, a LAN, a WAN, a modem-to-modem connection, the Internet, an intranet, an extranet, a cable transmission system, a cellular communication network, any combination of the foregoing, or any other communication network now known or later developed that permits two or more electronic devices to communicate therein. In some implementations, the transmitter 356 and the receiver 358 may be integrated in a transceiver. Additionally or alternatively, the transmitter 356, the receiver 358, or both may include and correspond to one or more components of the reference Figure 2 described base station 105.

[0076] In some implementations, the wireless communication system 300 implements a 5G New Radio (NR) network. For example, the wireless communication system 300 may include a plurality of 5G-capable UEs 115 and a plurality of 5G-capable network entities 350, such as UEs and network entities configured to operate according to a 5G NR network protocol such as defined by 3GPP.

[0077] During operation of the wireless communication system 300, the UE 115 may determine that a plurality of antenna elements 312 will be used to communicate with the network entity 350 in a first communication direction. In some implementations, determining to use the plurality of antenna elements 312 may be based on beam measurement operations performed on one or more reference signals such as one or more Channel State Information Reference Signals (CSI-RS) received from the network entity 350. By way of illustration, the UE 115 may perform one or more beam measurement operations on one or more CSI-RS received from the network entity 350, and based on these beam measurement operations, the UE 115 may determine (e.g., identify) a plurality of antenna elements 312 of the antenna array 310 and a first set of beamforming weights for communication in the first communication direction. The plurality of antenna elements 312 may include fewer antenna elements than all of the antenna elements of the antenna array 310, or may include all of the antenna elements of the antenna array 310.

[0078] UE 115 may also communicate with network entity 350 in a second communication direction. To enable communication in the second communication direction, UE 115 may determine (e.g., identify) a subset 314 of antenna elements that will be used to communicate with network entity 350 in the second communication direction. The subset 314 of antenna elements is a subset (e.g., proper subset) of a plurality of antenna elements 312 (e.g., the plurality of antenna elements that UE 115 uses to communicate in a first communication direction). For example, each antenna element included in the subset 314 of antenna elements is also included in the plurality of antenna elements 312 (e.g., the subset 314 of antenna elements does not include any antenna elements that are not included in the plurality of antenna elements 312). Determining which antenna elements are used to communicate in a particular communication direction is part of the process of determining a spatial domain filter for communication in that particular communication direction. For example, the spatial domain filter may include or correspond to beamforming weights for communication in a particular communication direction, which are based on the antenna elements used for communication in that particular communication direction.

[0079] UE 115 may determine the subset 314 of antenna elements based on determining communication in the second communication direction and optionally based on other information such as determining that communication in the second communication direction will be via an upper millimeter wave band (as a non-limiting example, a frequency greater than or equal to 52.6 GHz). When communicating in the second communication direction, UE 115 may determine to activate fewer antenna elements than all of the plurality of antenna elements 312 to reduce power consumption or thermal overshoot associated with components of the communication path corresponding to one or more of the plurality of antenna elements 312. In some implementations, UE 115 determines the subset 314 of antenna elements based on beam measurement operations performed on CSI-RS in the first communication direction. For example, beam measurements derived from CSI-RS in the first communication direction may be reused to determine the antenna elements for communication in the second communication direction.

[0080] Determining to communicate in the second communication direction using the subset 314 of antenna elements may be based on wireless communication standard specifications such as 3GPP wireless communication standard specifications. For example, a previous version of the 3GPP wireless communication standard specifications may specify that a UE transmit signals such as a physical uplink control channel (PUCCH) or a sounding reference signal (SRS) "using the same spatial domain filter" (or "the same spatial domain transmit filter") as used to receive at least some signals from a base station. However, to support the techniques described herein, a future version of the 3GPP standard may specify that a UE "potentially use a subset of the weights of the same spatial domain filter" (or "a subset of the weights of the same spatial domain transmit filter") or similar language to transmit signals such as PUCCH or SRS.

[0081] In some implementations, the first communication direction is different from the second communication direction, such as being opposite thereto. For example, the first communication direction may be a downlink direction (e.g., from network entity 350 to UE 115), and the second communication direction may be an uplink direction (e.g., from UE 115 to network entity 350). By disabling the power amplifiers or other power-intensive components of one or more transmit paths of UE 115, communicating in the uplink direction using fewer antenna elements can reduce the power consumption of UE 115. As another example, the first communication direction may be an uplink direction, and the second communication direction may be a downlink direction.

[0082] Figure 4A and Figure 4B FIG. illustrates an example of an antenna array 400 of a UE according to one or more aspects. Antenna array 400 may include or correspond to Figure 3 antenna array 310. Antenna array 400 includes a plurality of antenna array elements. In some implementations, as Figure 4A and Figure 4B shown, antenna array 400 includes 32 antenna elements, which are arranged in four rows, with eight antenna elements in each row. In other implementations, antenna array 400 includes fewer than 32 or more than 32 antenna elements, and the antenna elements may be arranged in different configurations.

[0083] As Figure 4A shown, a plurality of antenna elements 402 of antenna array 400 are activated to communicate in a first communication direction (as a non-limiting example, e.g., the downlink direction). In some implementations, the plurality of antenna elements 402 includes eight antenna elements located in the second and third rows of antenna array 400. In other implementations, the plurality of antenna elements 402 includes fewer than eight or more than eight antenna elements, and these antenna elements may be different from the antenna elements of antenna array 400 as Figure 4A shown. Based on beam measurement operations performed on one or more reference signals communicated in the first communication direction or in some other manner, the plurality of antenna elements 402 may be selected for communication in the first communication direction.

[0084] As Figure 4B shown, a subset 404 of antenna elements of antenna array 400 is activated to communicate in a second communication direction (as a non-limiting example, e.g., the uplink direction). Antenna element subset 404 is a subset of the plurality of antenna elements 402. For example, each antenna element included in antenna element subset 404 is also included in the plurality of antenna elements 402. However, not all antenna elements included in the plurality of antenna elements 402 are included in antenna element subset 404. In some implementations, as Figure 4BAs shown, the subset of antenna elements 404 includes two antenna elements included in the second and third rows of the antenna array 400. In other implementations, the subset of antenna elements 404 includes fewer or more antenna elements than two, and the antenna elements can be different from the antenna elements of the antenna array 400 shown in Figure 4B . In some implementations, as described above, the subset of antenna elements 404 can be determined or selected based on determining communication via the upper millimeter wave band and based on one or more beam measurements performed on one or more reference signals transmitted in a first communication direction. As further described herein, since the subset of antenna elements 404 is a subset of the plurality of antenna elements 402, the beam correspondence between the first communication direction and the second communication direction is not completely lost.

[0085] Returning to Figure 3 , after determining the subset of antenna elements 314, the UE 115 generates and transmits a message 370 to the network entity 350, and the message 370 indicates that the subset of antenna elements 314 will be used for communication in the second communication direction. For example, the message 370 can include a difference indicator 372, which indicates that the subset of antenna elements 314 will be used by the UE 115 to communicate with the network entity 350 in the second communication direction.

[0086] In some implementations, the message 370 indicates the antenna elements included in the subset of antenna elements 314. In such an implementation, as a non-limiting example, the difference indicator 372 can include one or more indicators of the antenna elements of the subset of antenna elements 314, such as a bitmap indicating whether each antenna element of the antenna array 310 will be activated during communication in the second communication direction. In some other implementations, the difference indicator 372 indicates a different antenna subarray to be used in the second communication direction than the antenna subarray used in the first communication direction, but does not explicitly indicate which antenna elements will be used in the second communication direction. For example, the difference indicator 372 can include a single bit or one or more bits, which indicate that a different antenna subarray than the one used for communication in the first communication direction will be used for communication in the second communication direction.

[0087] In some other implementations, instead of including (or in addition to) the difference indicator 372, the message 370 does not indicate the lack of beam correspondence between the first communication direction and the second communication direction or the hybrid mode beam correspondence between the first communication direction and the second communication direction. For example, if at least one antenna element used for communication in the second communication direction was not used for communication in the first communication direction, the UE 115 can transmit a message including an indication of no beam correspondence. However, the message 370 does not include such an indication (or an indication of hybrid mode beam correspondence).

[0088] In some such implementations, message 370 includes a status indicator 374. The status indicator 374 can indicate the status corresponding to the beam between the first communication direction and the second communication direction, thereby at least indirectly indicating the subset of antenna elements 314 (compared to the plurality of antenna elements 312). In some implementations, the first status corresponds to the absence of a beam correspondence between the first communication direction and the second communication direction (e.g., at least one antenna element used for communication in the second communication direction is not used for communication in the first communication direction). In such an implementation, the second status corresponds to the beam correspondence between the first communication direction and the second communication direction (e.g., the same antenna elements are used for communication in the first communication direction and the second communication direction). In such an implementation, the third status indicates a status different from the absence of beam correspondence and full beam correspondence. Such a third status can be indicated by the status indicator 374. In some implementations, the status indicator 374 includes a multi-bit indicator that indicates the status corresponding to the beam between the first communication direction and the second communication direction. As a non-limiting example, the status indicator 374 can include a two-bit indicator, where the value "11" indicates the first status, the value "00" indicates the second status, and the value "01" or "10" indicates the third status. In other implementations, the status indicator 374 can be a single bit, or can include more than two bits, or some other more granular indication. In some implementations, the status indicator 374 is included in the UE capability field of message 370, or corresponds to the UE capability field of message 370. In other implementations, the status indicator 374 can be included in another field of message 370.

[0089] Based on transmitting message 370 to network entity 350, UE 115 can receive an authorization message 376 from network entity 350. For example, network entity 350 can receive and process message 370 to determine that UE 115 will communicate in the second communication direction using the subset of antenna elements 314 (or at least a different subset of antenna elements), and based on that determination, network entity 350 can generate an authorization message 376 and transmit it to UE 115. The authorization message 376 can indicate permission (e.g., grant) for UE 115 to communicate in the second communication direction using the subset of antenna elements 314. For example, the authorization message 376 can include a flag or other field indicating whether UE 115 is allowed to communicate in the second communication direction using the subset of antenna elements 314.

[0090] After receiving the authorization message 376 at the UE 115, the UE 115 and the network entity 350 may perform a first communication 378 in a first communication direction, a second communication 380 in a second communication direction, or both. Although described as being performed after receiving the authorization message 376, in other implementations, the first communication 378 may be performed before the UE 115 receives the authorization message 376 or before the UE 115 determines (e.g., identifies) the subset of antenna elements 314. The UE 115 performs the first communication 378 using a plurality of antenna elements 312 and performs the second communication 380 using the subset of antenna elements 314. In some implementations, performing the first communication 378 in the first communication direction includes the network entity 350 transmitting a first message to the UE 115, and performing the second communication 380 in the second communication direction includes the network entity 350 receiving a second message from the UE 115. For example, the network entity 350 may transmit a first message to the UE 115 in the downlink direction, and the UE 115 may transmit a second message to the network entity 350 in the uplink direction. In some other implementations, performing the first communication 378 in the first communication direction includes the network entity 350 receiving a first message from the UE 115, and performing the second communication 380 in the second communication direction includes the network entity 350 transmitting a second message to the UE 115. For example, the UE 115 may transmit a first message to the network entity 350 in the uplink direction, and the network entity 350 may transmit a second message to the UE 115 in the downlink direction.

[0091] In some implementations, performing the first communication 378 by the UE 115 includes the UE 115 applying beamforming weights 306 (e.g., a first set of beamforming weights) to the first communication 378 and applying a subset 308 of the beamforming weights (e.g., a second set of beamforming weights) to the second communication 380. For example, if the first communication 378 is a downlink communication and the second communication 380 is an uplink communication, the UE 115 may apply the beamforming weights 306 to the first communication 378 during reception (e.g., as part of processing the first communication 378), and may apply the subset 308 of the beamforming weights to the second communication 380 before transmitting the second communication 380. The subset 308 of the beamforming weights is a subset (e.g., a proper subset) of the beamforming weights 306 and corresponds to a subset of antenna elements 314. For example, each beamforming weight included in the subset 308 of the beamforming weights is also included in the beamforming weights 306. Determining the respective sets of beamforming weights may be part of a process of determining respective spatial domain filters for communicating in various communication directions. For example, the UE 115 may communicate in a first communication direction using a first spatial domain filter (e.g., including or corresponding to the beamforming weights 306), and the UE 115 may communicate in a second communication direction using a second spatial domain filter (e.g., including or corresponding to the subset 308 of the beamforming weights). Since the subset 308 of the beamforming weights is a subset of the beamforming weights 306, the second spatial domain filter may be a subset of the first spatial domain filter. Thus, the asymmetry between the first spatial domain filter and the second spatial domain filter can be considered.

[0092] In some such implementations, before applying the subset 308 of the beamforming weights to the second communication 380, the UE 115 may perform one or more calibration operations on the subset 308 of the beamforming weights (e.g., the second set of beamforming weights) based on calibration data 309. As described above, the calibration data 309 may represent the differences between the components of the communication path in the first communication direction and the components of the communication path in the second communication direction. For example, the calibration data 309 may represent the differences between the power amplifier in the transmit path and the low noise amplifier in the receive path, and so on. Performing one or more calibration operations may calibrate (e.g., adjust or modify) the subset 308 of the beamforming weights so that beamforming can be performed in the second communication direction with higher accuracy or precision.

[0093] In some other implementations, compared to a public network such as a cellular network, the wireless communication system 300 includes or corresponds to a private network such as an industrial network. In such an implementation, the network entity 350 may transmit one or more CSI-RS 382 to the UE 115 based on receiving the message 370 from the UE 115. In such an implementation, the message 370 includes a difference indicator 372 (indicating that the subarray used for communication in the second communication direction is different from the subarray used for communication in the first communication direction), and does not include a status indicator 374. Based on detecting the difference indicator 372, the network entity 350 may transmit the CSI-RS 382 to the UE 115 without transmitting an authorization message 376. Based on receiving the CSI-RS 382, the UE 115 may perform one or more beam measurement operations on the CSI-RS 382 and may generate a set of beamforming weights based on one or more beamforming operations. The UE 115 may apply the set of beamforming weights to one or more signals scheduled for communication in the second communication direction (such as the second communication 380). In some implementations, the set of beamforming weights is a subset of the beamforming weights 306 (e.g., a subset of the beamforming weights enabling beamforming in the first communication direction). In some other implementations, at least one beamforming weight in the set of beamforming weights is not included in the beamforming weights 306.

[0094] As described above with reference to Figure 3 the present disclosure provides techniques for compensating for spatial filter asymmetry at a UE when communicating in an upper millimeter wave band. For example, the UE 115 may determine to communicate in a first communication direction using a plurality of antenna elements 312 and may determine to communicate in a second communication direction using a subset of antenna elements 314. Since the subset of antenna elements 314 is a subset of the plurality of antenna elements 312, when communicating in the second communication direction, the UE 115 may use a subset of the beamforming weights 306 (e.g., the subset of beamforming weights 308). Compared to determining a second set of beamforming weights based on beam measurements of a reference signal in the second communication direction, using the subset of beamforming weights 308 may be faster and use fewer processing resources. Additionally, since some of the plurality of antenna elements 312 are deactivated during communication in the second communication direction, the power consumption at the UE 115 may be reduced. For example, if the second communication direction is the uplink direction, during communication in the second communication direction, one or more power amplifiers in one or more transmit paths may be deactivated, thereby reducing the power consumption at the UE 115.

[0095] Referring to Figure 5, The figure is a flowchart of an example process 500 performed by a UE for communication according to one or more aspects. For example, according to some aspects of the present disclosure, example blocks of process 500 may cause the UE to determine a subset of antenna elements for communicating with a network entity in a particular communication direction. The example blocks will also be described with reference to Figure 7 the UE 115 shown. Figure 7 is a block diagram of an example UE 115 that supports compensating for transceiver spatial filter asymmetry. According to one aspect of the present disclosure, the UE 115 may be configured to perform one or more operations to determine a subset of antenna elements for communicating with a network entity in a particular communication direction. The UE 115 includes the structure, hardware, and components as shown for Figure 2 or Figure 3 the UE 115. For example, the UE 115 includes: a controller 280 for running logic or computer instructions stored in a memory 282 and controlling the components of the UE 115 that provide the features and functions of the UE 115. Under the control of the controller 280, the UE 115 transmits and receives signals via radio frequencies 701a-r and antennas 252a-r. The radio frequencies 701a-r include various components and hardware, such as Figure 2 shown for the UE 115 in

[0096] including modulators and demodulators 254a-r, a MIMO detector 256, a receive processor 258, a transmit processor 264, and a TX MIMO processor 266.

[0096] As shown, the memory 282 may include antenna element selection logic 702 and transmit logic 703. The antenna element selection logic 702 and the transmit logic 703 may include or correspond to a processor 302, a transmitter 316, or a combination thereof. For example, the antenna element selection logic 702 may be configured to determine a subset of antenna elements among a plurality of antenna elements to be used in a particular communication direction, and the transmit logic 703 may be configured to transmit one or more signals such as message 370. The UE 115 may receive signals from or transmit signals to one or more network entities, such as Figures 1 to 2 the base station 105 of Figure 3 the network entity 350 of Figure 8 the core network, core network devices, or the network entity shown in

[0097] Returning to Figure 5, a flowchart of an example process 500 for UE operations for communication according to one or more aspects is shown. In some implementations, process 500 may be performed by UE 115. In some other implementations, process 500 may be performed by a device configured for wireless communication. For example, the device may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operations of process 500. In some other implementations, process 500 may be executed or run using a non-transitory computer-readable medium having program code recorded thereon. The program code may be program code executable by a computer for causing the computer to perform the operations of process 500.

[0098] As shown in block 502, a user equipment (UE) determines a subset of antenna elements from a plurality of antenna elements that will be used to communicate with a network entity in a second communication direction. The plurality of antenna elements are used to communicate with the network entity in a first communication direction. As an example of block 502, UE 115 may operate antenna element selection logic 702 stored in memory 282 under the control of controller 280. The operating environment of antenna element selection logic 702 provides the function of determining a subset of antenna elements from a plurality of antenna elements that will be used to communicate with a network entity in a second communication direction. The plurality of antenna elements are used to communicate with the network entity in a first communication direction.

[0099] In block 504, the UE transmits a message to the network entity indicating that the subset of antenna elements will be used for communication in the second communication direction. By way of illustration, UE 115 may transmit a message indicating that the subset of antenna elements will be used for communication in the second communication direction using radio frequencies 701a-r and antennas 252a-r. For further illustration, UE 115 may operate transmit logic 703 stored in memory 282 under the control of controller 280. The operating environment of transmit logic 703 provides the function of transmitting a message indicating that the subset of antenna elements will be used for communication in the second communication direction.

[0100] In some implementations, the first communication direction is a downlink direction and the second communication direction is an uplink direction. Alternatively, the first communication direction is an uplink direction and the second communication direction is a downlink direction.

[0101] In some implementations, the message indicates the use of an antenna subarray different from the antenna subarray used in the first communication direction in the second communication direction. In some such implementations, the message does not indicate a lack of beam correspondence between the first communication direction and the second communication direction or a hybrid mode beam correspondence between the first communication direction and the second communication direction. Additionally or alternatively, the first state corresponds to a lack of beam correspondence between the first communication direction and the second communication direction, the second state corresponds to a beam correspondence between the first communication direction and the second communication direction, and the message indicates a third state different from the first state and the second state. In some such implementations, the message includes a multi-bit field indicating the third state. In some such implementations, the multi-bit field includes a UE capability field.

[0102] In some implementations, procedure 500 further includes receiving an authorization message from a network entity, the authorization message indicating that the UE is allowed to communicate in the second communication direction using a subset of antenna elements.

[0103] In some implementations, procedure 500 further includes: performing a first communication with the network entity in the first communication direction using a plurality of antenna elements; and performing a second communication with the network entity in the second communication direction using a subset of antenna elements. In some such implementations, performing the first communication in the first communication direction includes receiving a first message from the network entity, and performing the second communication in the second communication direction includes transmitting a second message to the network entity. Alternatively, performing the first communication in the first communication direction includes transmitting a first message to the network entity, and performing the second communication in the second communication direction includes receiving a second message from the network entity. Additionally or alternatively, performing the first communication in the first communication direction includes applying a first set of beamforming weights to the first communication, and performing the second communication in the second communication direction includes applying a second set of beamforming weights to the second communication. The second set of beamforming weights includes a subset of the first set of beamforming weights corresponding to the subset of antenna elements used in the second communication direction. In some such implementations, procedure 500 further includes: performing one or more calibration operations on the second set of beamforming weights before applying the second set of beamforming weights.

[0104] In some implementations, procedure 500 further includes: receiving one or more channel state information reference signals (CSI-RS) from the network entity in response to transmitting a message. In some such implementations, procedure 500 further includes: performing one or more beam measurement operations on the one or more CSI-RS; generating a set of beamforming weights based on the one or more beam measurement operations; and applying the set of beamforming weights to a signal scheduled for communication in the second communication direction.

[0105] Accordingly, process 500 enables the UE to compensate for spatial filter asymmetry at least when communicating via the upper millimeter wave band. For example, the UE may determine to communicate in a second communication direction using a subset of antenna elements, which does not completely disrupt the beam correspondence between the first communication direction and the second communication direction. Additionally, when communicating in the second communication direction, the UE may deactivate one or more components of the communication path, thereby reducing the power consumption at the UE.

[0106] Figure 6 is a flowchart illustrating an example process 600 for communication performed by a network entity according to one or more aspects. For example, according to some aspects of the present disclosure, example blocks of process 600 may cause the network entity to transmit an authorization message that indicates that the UE may communicate in a specific communication direction using a subset of antenna elements. The example blocks will also be described with reference to Figure 8 the network entity 350 shown. Figure 8 is a block diagram illustrating an example network entity 350 that supports compensating for transceiver spatial filter asymmetry according to one or more aspects. As an illustrative and non-limiting example, the network entity 350 may include a base station 105, a network, or a core network. The network entity 350 includes structures, hardware, and components as shown for Figure 1 and Figure 2 the base station 105 of Figure 3 the network entity 350 or a combination thereof. For example, the network entity 350 may include: a controller 240 for running logic or computer instructions stored in a memory 242 and controlling components of the network entity 350 that provide the features and functions of the network entity 350. Under the control of the controller 240, the network entity 350 transmits and receives signals via radio frequencies 801a-t and antennas 234a-t. The radio frequencies 801a-t include various components and hardware, such as Figure 2 shown for the network entity 350 (such as the base station 105) in

[0107] As shown in the figure, the memory 242 may include a receiving logic 802, an authorization message generating logic 803, and a transmitting logic 804. The receiving logic 802, the authorization message generating logic 803, and the transmitting logic 804 may include or correspond to the processor 352, the transmitter 356, the receiver 358, or a combination thereof. For example, the receiving logic 802 may be configured to receive one or more signals such as the message 370, the authorization message generating logic 803 may be configured to generate an authorization message such as the authorization message 376, and the transmitting logic 804 may be configured to transmit one or more signals such as the authorization message 376, the first communication 378, the second communication 380, the CSI-RS 382, or a combination thereof. The network entity 350 may receive signals from or transmit signals to one or more UEs such as Figures 1 to 3 or Figure 7 the UE 115.

[0108] Returning to Figure 6 , a flowchart of an example process 600 for operating a network entity for communication according to one or more aspects is illustrated. In some implementations, the process 600 may be performed by the network entity 350. In some other implementations, the process 600 may be performed by a device configured for wireless communication. For example, the device may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operations of the process 600. In some other implementations, the process 600 may be executed or run using a non-transitory computer-readable medium having program code recorded thereon. The program code may be program code executable by a computer for causing the computer to perform the operations of the process 600.

[0109] As shown in block 602, the network entity receives a message from a user equipment (UE) that indicates a subset of antenna elements among a plurality of antenna elements that will be used by the UE to communicate with the network entity in a second communication direction. The plurality of antenna elements are used by the UE to communicate with the network entity in a first communication direction. For illustration, the network entity 350 may use the radio frequencies 801a-t and the antennas 234a-t to receive the message. For further illustration, the network entity 350 may operate the receiving logic 802 stored in the memory 242 under the control of the controller 240. The operating environment of the receiving logic 802 provides the function of receiving a message from the UE that indicates a subset of antenna elements among a plurality of antenna elements that will be used by the UE to communicate with the network entity in a second communication direction. The plurality of antenna elements are used by the UE to communicate with the network entity in a first communication direction.

[0110] At block 604, the network entity transmits an authorization message to the UE, the authorization message indicating that the UE is allowed to communicate in a second communication direction using a subset of antenna elements. As an example of block 602, network entity 350 may operate, under the control of controller 240, authorization message generation logic 803 stored in memory 242. The operating environment of authorization message generation logic 803 provides the function of generating an authorization message that indicates that the UE is allowed to communicate in a second communication direction using a subset of antenna elements. As another example, network entity 350 may use radio frequencies 801a-t and antennas 234a-t to transmit the authorization message. For further illustration, network entity 350 may execute transmission logic 804 running in memory 242 under the control of controller 240. The operating environment of transmission logic 804 provides the function of transmitting the authorization message to the UE.

[0111] In some implementations, the first communication direction is the downlink direction and the second communication direction is the uplink direction. Alternatively, the first communication direction is the uplink direction and the second communication direction is the downlink direction.

[0112] In some implementations, the message indicates using a different antenna subarray in the second communication direction than that used in the first communication direction. In some such implementations, the message does not indicate a lack of beam correspondence or a hybrid-mode beam correspondence between the first and second communication directions. Additionally or alternatively, the first state corresponds to a lack of beam correspondence between the first and second communication directions, the second state corresponds to a beam correspondence between the first and second communication directions, and the message indicates a third state different from the first and second states. In some such implementations, the message includes a multi-bit field indicating the third state. In some such implementations, the multi-bit field includes a UE capability field.

[0113] In some implementations, process 600 further includes performing a first communication with the UE in the first communication direction. The first communication corresponds to a plurality of antenna elements. Process 600 further includes performing a second communication with the UE in the second communication direction. The second communication corresponds to a subset of antenna elements. In some such implementations, performing the first communication in the first communication direction includes transmitting a first message to the UE, and performing the second communication in the second communication direction includes receiving a second message from the UE. Alternatively, performing the first communication in the first communication direction includes receiving a first message from the UE, and performing the second communication in the second communication direction includes transmitting a second message to the UE.

[0114] In some implementations, process 600 further includes transmitting, in response to receiving the message, one or more channel state information reference signals (CSI-RS) to the UE.

[0115] Thus, process 600 enables the UE to compensate for spatial filter asymmetry at least when communicating via the upper millimeter wave band. For example, the UE may determine to communicate in a second communication direction using a subset of antenna elements, which may be enabled by a network entity transmitting an authorization message to the UE. Using a subset of antenna elements at the UE does not completely disrupt the beam correspondence between the first communication direction and the second communication direction. Additionally, when communicating in the second communication direction, the UE may deactivate one or more components of the communication path, thereby reducing power consumption at the UE.

[0116] Note that Figure 5 and Figure 6 one or more of the blocks (or operations) described with reference to Figure 5 may be combined with one or more of the blocks (or operations) of another figure. For example, Figure 6 one or more of the blocks (or operations) of Figure 5 or Figure 6 may be combined with one or more of the blocks (or operations) of Figure 2 or Figure 3 Another. Additionally or alternatively, one or more of the operations described above with reference to Figures 1 to 7 may be combined with one or more of the operations described with reference to Figure 8

[0117] In some aspects, techniques for compensating for transceiver spatial filter asymmetry, such as in the upper millimeter wave band, may include additional aspects, such as any single aspect or any combination of multiple aspects described below, or in combination with one or more other processes or devices described elsewhere herein. In some aspects, compensating for transceiver spatial filter asymmetry may include a means for determining a subset of antenna elements from among a plurality of antenna elements to be used for communicating with a network entity in a second communication direction. The plurality of antenna elements are used for communicating with the network entity in a first communication direction. The means may also transmit a message to the network entity indicating that the subset of antenna elements will be used for communication in the second communication direction. In some implementations, the means includes a wireless device such as a UE, CPE, repeater, relay node, IAB node, etc. In some implementations, the means may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operations described herein for the wireless device. In some other implementations, the means may include a non-transitory computer-readable medium having program code recorded thereon, and the program code may be run by a computer to cause the computer to perform the operations described herein with reference to the wireless device. In some implementations, the means may include one or more components configured to perform the operations described herein.

[0118] ​In a first aspect, the first communication direction is a downlink direction and the second communication direction is an uplink direction.

[0119] In a second aspect, the first communication direction is an uplink direction and the second communication direction is a downlink direction.

[0120] In a third aspect, either alone or in combination with one or more of the first to second aspects, the message indicates that a different antenna subarray is used in the second communication direction than in the first communication direction.

[0121] In a fourth aspect, in combination with the third aspect, the message does not indicate a lack of beam correspondence between the first communication direction and the second communication direction or a hybrid mode beam correspondence between the first communication direction and the second communication direction.

[0122] In a fifth aspect, in combination with the third aspect, a first state corresponds to a lack of beam correspondence between the first communication direction and the second communication direction, a second state corresponds to a beam correspondence between the first communication direction and the second communication direction, and the message indicates a third state different from the first state and the second state.

[0123] In a sixth aspect, in combination with the fifth aspect, the message includes a multi-bit field indicating the third state.

[0124] In a seventh aspect, in combination with the sixth aspect, the multi-bit field includes a UE capability field.

[0125] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the device receives an authorization message from a network entity, the authorization message indicating that the device is allowed to communicate in the second communication direction using a subset of antenna elements.

[0126] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the device performs a first communication with the network entity in the first communication direction using a plurality of antenna elements, and performs a second communication with the network entity in the second communication direction using a subset of antenna elements.

[0127] In a tenth aspect, in combination with the ninth aspect, performing the first communication in the first communication direction includes receiving a first message from the network entity, and performing the second communication in the second communication direction includes transmitting a second message to the network entity.

[0128] In an eleventh aspect, in combination with the ninth aspect, performing the first communication in the first communication direction includes transmitting a first message to the network entity, and performing the second communication in the second communication direction includes receiving a second message from the network entity.

[0129] In a twelfth aspect, in combination with the ninth aspect, performing a first communication in a first communication direction includes applying a first set of beamforming weights to the first communication, and performing a second communication in a second communication direction includes applying a second set of beamforming weights to the second communication. The second set of beamforming weights includes a subset of the first set of beamforming weights corresponding to a subset of antenna elements used in the second communication direction.

[0130] In a thirteenth aspect, in combination with the twelfth aspect, the apparatus performs one or more calibration operations on the second set of beamforming weights before applying the second set of beamforming weights.

[0131] In a fourteenth aspect, either alone or in combination with one or more of the first through thirteenth aspects, the apparatus receives one or more channel state information reference signals (CSI-RS) from a network entity in response to a transmission message.

[0132] In a fifteenth aspect, in combination with the fourteenth aspect, the apparatus performs one or more beam measurement operations on the one or more CSI-RS, generates a set of beamforming weights based on the one or more beam measurement operations, and applies the set of beamforming weights to signals scheduled for communication in the second communication direction.

[0133] In some aspects, a device configured for wireless communication, such as a network entity, is configured to receive a message from a wireless device that indicates a subset of antenna elements among a plurality of antenna elements that will be used by the wireless device to communicate with the network entity in a second communication direction. The plurality of antenna elements are used by the wireless device to communicate with the network entity in a first communication direction. The device is further configured to transmit an authorization message to the wireless device that indicates permission for the wireless device to use the subset of antenna elements to communicate in the second communication direction. In some implementations, the device includes the wireless device, such as the network entity. In some implementations, the device may include at least one processor and a memory coupled to the processor. The processor may be configured to perform the operations described herein for the wireless device. In some other implementations, the device may include a non-transitory computer-readable medium having program code recorded thereon, and the program code may be run by a computer to cause the computer to perform the operations described herein with reference to the wireless device. In some implementations, the device may include one or more components configured to perform the operations described herein.

[0134] In a sixteenth aspect, the first communication direction is a downlink direction and the second communication direction is an uplink direction.

[0135] In a seventeenth aspect, the first communication direction is an uplink direction and the second communication direction is a downlink direction.

[0136] In an eighteenth aspect, either alone or in combination with one or more of the sixteenth to seventeenth aspects, the message indicates the use of an antenna subarray different from the antenna subarray used in the first communication direction in the second communication direction.

[0137] In a nineteenth aspect, in combination with the eighteenth aspect, the message does not indicate a lack of beam correspondence between the first communication direction and the second communication direction or a hybrid-mode beam correspondence between the first communication direction and the second communication direction.

[0138] In a twentieth aspect, in combination with the eighteenth aspect, a first state corresponds to a lack of beam correspondence between the first communication direction and the second communication direction, a second state corresponds to a beam correspondence between the first communication direction and the second communication direction, and the message indicates a third state different from the first state and the second state.

[0139] In a twenty-first aspect, in combination with the twentieth aspect, the message includes a multi-bit field indicating the third state.

[0140] In a twenty-second aspect, in combination with the twenty-first aspect, the multi-bit field includes a UE capability field.

[0141] In a twenty-third aspect, either alone or in combination with one or more of the sixteenth to twenty-second aspects, the apparatus performs a first communication with a wireless device in a first communication direction. The first communication corresponds to a plurality of antenna elements. The apparatus also performs a second communication with the wireless device in a second communication direction. The second communication corresponds to a subset of the antenna elements.

[0142] In a twenty-fourth aspect, in combination with the twenty-third aspect, performing the first communication in the first communication direction includes transmitting a first message to the wireless device, and performing the second communication in the second communication direction includes receiving a second message from the wireless device.

[0143] In a twenty-fifth aspect, in combination with the twenty-fourth aspect, performing the first communication in the first communication direction includes receiving a first message from the wireless device, and performing the second communication in the second communication direction includes transmitting a second message to the wireless device.

[0144] In a twenty-sixth aspect, either alone or in combination with one or more of the sixteenth to twenty-fifth aspects, the apparatus transmits one or more channel state information reference signals (CSI-RS) to the wireless device in response to receiving the message.

[0145] Those skilled in the art will understand that information and signals can be represented using any of a variety of different technologies and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0146] As referred to herein Figures 1 to 8 the described components, functional blocks, and modules may include processors, electronic devices, hardware devices, electronic components, logic circuits, memories, software code, firmware code, etc., or any combination thereof. Additionally, the features discussed herein may be implemented via dedicated processor circuitry, via executable instructions, or a combination thereof.

[0147] Those skilled in the art will further appreciate that the various illustrative logical blocks, modules, circuits, and algorithmic steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in different ways for each particular application, but such implementation decisions should not be construed as causing a departure from the scope of the disclosure. Those skilled in the art will also readily recognize that the order or combination of the components, methods, or interactions described herein are merely examples, and that the components, methods, or interactions of the various aspects of the disclosure may be combined or performed in a different manner than shown and described herein.

[0148] The various exemplary logics, logical blocks, modules, circuits, and algorithmic processes described in connection with the implementations disclosed herein may be implemented as electronic hardware, computer software, or a combination of both. The interchangeability of hardware and software has been described generally in terms of functionality and illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented with hardware or software depends upon the particular application and design constraints of the overall system.

[0149] Hardware and data processing apparatuses for implementing the various illustrative logics, logic blocks, modules, and circuits described in connection with the aspects disclosed herein can be implemented or executed with a general-purpose single-chip or multi-chip processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor can be a microprocessor or any conventional processor, controller, microcontroller, or state machine. In some implementations, a processor can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. In some implementations, specific processes and methods can be performed by circuitry specific to a given function.

[0150] In one or more aspects, the described functionality can be implemented in hardware, digital electronic circuitry, computer software, firmware (including the structures disclosed in this specification and their equivalents, or any combination thereof). Implementations of the subject matter described in this specification can also be implemented as one or more computer programs, i.e., one or more modules of computer program instructions encoded on a computer storage medium for running on, or to control the operation of, a data processing apparatus.

[0151] If implemented in software, the functions can be stored or transmitted as one or more instructions or code on a computer-readable medium. The processes of the methods or algorithms disclosed herein can be implemented as a processor-executable software module residing on a computer-readable medium. Computer-readable media includes: computer storage media and communication media, including any medium that can transfer a computer program from one place to another. Storage media can be any available medium accessible by a computer. By way of example and not limitation, such computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired program code in the form of instructions or data structures and that can be accessed by a computer. Likewise, any connection can be properly termed a computer-readable medium. As used herein, disks and discs include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), hard disks, solid state disks, floppy disks, and Blu-ray discs, where disks typically reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media. Additionally, the operations of a method or algorithm can reside as one or any combination or set of codes and instructions on a machine-readable medium and a computer-readable medium, which can be incorporated into a computer program product.

[0152] Various modifications to the implementations described in this disclosure will be apparent to those skilled in the art, and the general principles defined herein can be applied to some other implementations without departing from the spirit or scope of the disclosure. Accordingly, the claims are not intended to be limited to the implementations shown herein but are to be accorded the widest scope consistent with the disclosure, the principles and novel features disclosed herein.

[0153] In addition, those of ordinary skill in the art will readily understand that the terms "upper" and "lower" are sometimes used for convenience in describing the figures and represent relative positions corresponding to the orientation of the figures on the correctly oriented page and may not reflect the correct orientation of any device implemented.

[0154] Certain features that are described in the context of separate implementations in this specification can also be implemented in combination in a single implementation. Conversely, the various features described in the context of a single implementation can also be implemented separately in multiple implementations or in any suitable sub-combination. Additionally, although the features may be described as acting in certain combinations and even initially claimed as such, one or more features from the claimed combination can in some cases be deleted from the combination, and the claimed combination can be directed to a sub-combination or a variation of the sub-combination.

[0155] Similarly, although the operations are depicted in the figures in a particular order, this should not be construed as requiring that the operations be performed in the particular order or sequence shown, or that all of the operations shown be performed, to obtain the desired result. Additionally, the figures may schematically depict one or more example processes in the form of a flowchart. However, other operations not shown can be incorporated into the example processes schematically shown. For example, one or more additional operations can be performed before, after, simultaneously with, or between any of the operations shown. In some cases, multitasking and parallel processing can be advantageous. Further, the separation of the various system components in the above implementations should not be understood as required in all implementations, and it should be understood that the described program components and systems can generally be integrated together in a single software product or encapsulated into multiple software products. Additionally, some other implementations are also within the scope of the following claims. In some cases, the acts recited in the claims can be performed in a different order and still obtain the desired result.

[0156] As used herein, including in the claims, when used in a list of two or more items, the term "or" means that any one of the listed items can be used alone or any combination of two or more of the listed items can be used. For example, if a composition is described as comprising components A, B, or C, the composition can comprise: A alone; B alone; C alone; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B, and C. Additionally, as used herein, including in the claims, "or" used in a list of items beginning with "at least one" denotes a disjunctive list such that, for example, a list of "at least one of A, B, or C" means any one of A or B or C or AB or AC or BC or ABC (i.e., A and B and C) or any combination thereof. As will be understood by one of ordinary skill in the art, the term "substantially" is defined as largely but not necessarily wholly that which is specified (and includes that which is specified; e.g., substantially 90 degrees includes 90 degrees, substantially parallel includes parallel). In any of the disclosed implementations, the term "substantially" can be replaced with "[percentage] within", where the percentage includes.1%, 1%, 5%, or 10%.

[0157] The foregoing description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, the method comprises: selecting, at a wireless device, a subset of antenna elements from a plurality of antenna elements to be used for communicating with a network entity in a second communication direction, wherein the plurality of antenna elements are used for communicating with the network entity in a first communication direction, and wherein the subset of antenna elements comprises fewer antenna elements than all of the plurality of antenna elements; and transmitting, from the wireless device to the network entity, a message indicating that the subset of antenna elements will be used for communicating in the second communication direction, the message including a status indicator, wherein a particular value of the status indicator corresponds to a state different from a beam correspondence between the first communication direction and the second communication direction, and the particular value of the status indicator corresponds to a state different from a lack of beam correspondence between the first communication direction and the second communication direction.

2. The method according to claim 1, wherein, the first communication direction is a downlink direction, and wherein the second communication direction is an uplink direction.

3. The method according to claim 1, wherein, the first communication direction is an uplink direction, and wherein the second communication direction is a downlink direction.

4. The method according to claim 1, further comprises: receiving, from the network entity, an authorization message indicating that the wireless device is permitted to use the subset of antenna elements for communicating in the second communication direction.

5. The method according to claim 1, further comprises: performing a first communication with the network entity in the first communication direction using the plurality of antenna elements; and performing a second communication with the network entity in the second communication direction using the subset of antenna elements.

6. The method according to claim 5, wherein: performing the first communication in the first communication direction comprises receiving a first message from the network entity; and performing the second communication in the second communication direction comprises transmitting a second message to the network entity.

7. The method according to claim 5, wherein: performing the first communication in the first communication direction comprises transmitting a first message to the network entity; and performing the second communication in the second communication direction comprises receiving a second message from the network entity.

8. The method according to claim 1, further comprises: performing a first communication in the first communication direction, wherein performing the first communication in the first communication direction comprises applying a first set of beamforming weights to the first communication; and performing a second communication in the second communication direction, wherein performing the second communication in the second communication direction comprises applying a second set of beamforming weights to the second communication, and wherein: the second set of beamforming weights comprises a subset of the first set of beamforming weights that is less than all of the first set of beamforming weights, the second set of beamforming weights corresponds to the subset of antenna elements used in the second communication direction, The first communication direction is the downlink direction and the second communication direction is the uplink direction, or the first communication direction is the uplink direction and the second communication direction is the downlink direction.

9. The method according to claim 8, further comprising: performing one or more calibration operations on the second set of beamforming weights before applying the second set of beamforming weights.

10. The method according to claim 1, further comprising: receiving, in response to transmitting the message, one or more channel state information reference signals CSI-RS from the network entity; performing one or more beam measurement operations on the one or more CSI-RS; generating a set of beamforming weights based on the one or more beam measurement operations; and applying the set of beamforming weights to a signal scheduled for communication in the second communication direction.

11. The method according to claim 1, wherein the plurality of antenna elements includes each antenna element in the subset of antenna elements and one or more additional antenna elements of the wireless device.

12. The method according to claim 1, wherein determining a subset of antenna elements for communication in a second communication direction comprises: determining to deactivate one or more of the plurality of antenna elements for communication in the second communication direction.

13. The method according to claim 1, wherein the status indicator includes a multi-bit field indicating one of at least three states, the at least three states comprising: a first state corresponding to a lack of beam correspondence between the first communication direction and the second communication direction; a second state corresponding to beam correspondence between the first communication direction and the second communication direction; and a third state different from the first state and the second state, the specific value corresponding to the third state.

14. An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured to: select, at a wireless device, a subset of antenna elements from a plurality of antenna elements to be used for communicating with a network entity in a second communication direction, wherein the plurality of antenna elements are used for communicating with the network entity in a first communication direction, and wherein the subset of antenna elements includes fewer antenna elements than all of the plurality of antenna elements; and initiate transmission of a message from the wireless device to the network entity, the message indicating that the subset of antenna elements will be used for communication in the second communication direction, the message including a status indicator, wherein a specific value of the status indicator corresponds to a state different from beam correspondence between the first communication direction and the second communication direction, and the specific value of the status indicator corresponds to a state different from a lack of beam correspondence between the first communication direction and the second communication direction.

15. The apparatus according to claim 14, wherein, The message does not indicate a lack of beam correspondence between the first communication direction and the second communication direction or a hybrid mode beam correspondence between the first communication direction and the second communication direction.

16. The apparatus according to claim 14, wherein: a first state corresponds to a lack of beam correspondence between the first communication direction and the second communication direction; a second state corresponds to a beam correspondence between the first communication direction and the second communication direction; and a specific value of the status indicator corresponds to a third state different from the first state and the second state.

17. The apparatus according to claim 16, wherein, the status indicator includes a multi-bit user equipment (UE) capability field indicating the third state.

18. A method for wireless communication, the method comprising: receiving, at a network entity, a message from a wireless device, the message indicating that a subset of antenna elements among a plurality of antenna elements will be used by the wireless device to communicate with the network entity in a second communication direction, wherein: the plurality of antenna elements are used by the wireless device to communicate with the network entity in a first communication direction, the subset of antenna elements includes fewer antenna elements than all of the plurality of antenna elements, the message includes a status indicator, and a specific value of the status indicator corresponds to a state different from the beam correspondence between the first communication direction and the second communication direction and a specific value of the status indicator corresponds to a state different from the lack of beam correspondence between the first communication direction and the second communication direction; and transmitting, from the network entity to the wireless device, an authorization message, the authorization message indicating that the wireless device is allowed to use the subset of antenna elements to communicate in the second communication direction.

19. The method according to claim 18, wherein, the first communication direction is a downlink direction and wherein the second communication direction is an uplink direction.

20. The method according to claim 18, wherein, the first communication direction is an uplink direction and wherein the second communication direction is a downlink direction.

21. The method according to claim 18, further comprising: performing a first communication with the wireless device in the first communication direction, the first communication corresponding to the plurality of antenna elements; and performing a second communication with the wireless device in the second communication direction, the second communication corresponding to the subset of antenna elements.

22. The method according to claim 21, wherein: performing the first communication in the first communication direction includes transmitting a first message to the wireless device; and performing the second communication in the second communication direction includes receiving a second message from the wireless device.

23. The method according to claim 21, wherein: performing the first communication in the first communication direction includes receiving a first message from the wireless device; and performing the second communication in the second communication direction includes transmitting a second message to the wireless device.

24. The method according to claim 18, further comprising: In response to receiving the message, transmit one or more channel state information reference signals CSI-RS to the wireless device.

25. An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured to: receive, at a network entity, a message from a wireless device, the message indicating that a subset of antenna elements among a plurality of antenna elements is to be used by the wireless device to communicate with the network entity in a second communication direction, wherein: the plurality of antenna elements are used by the wireless device to communicate with the network entity in a first communication direction, the subset of antenna elements comprises fewer antenna elements than all of the plurality of antenna elements, the message comprises a status indicator, and a particular value of the status indicator corresponds to a state different from a beam correspondence between the first communication direction and the second communication direction, and the particular value of the status indicator corresponds to a state different from a lack of beam correspondence between the first communication direction and the second communication direction; and initiate transmission of an authorization message from the network entity to the wireless device, the authorization message indicating that the wireless device is permitted to use the subset of antenna elements to communicate in the second communication direction.

26. The apparatus according to claim 25, wherein, the message does not indicate a lack of beam correspondence or a mixed-mode beam correspondence between the first communication direction and the second communication direction.

27. The apparatus according to claim 25, wherein: a first state corresponds to a lack of beam correspondence between the first communication direction and the second communication direction; a second state corresponds to a beam correspondence between the first communication direction and the second communication direction; and a particular value of the status indicator corresponds to a third state different from the first state and the second state.

28. The apparatus according to claim 27, wherein the status indicator comprises a multi-bit user equipment UE capability field indicating the third state.

29. An apparatus for performing wireless communication at a user equipment UE, the apparatus comprising components for performing the method according to any one of claims 1-13.

30. An apparatus for performing wireless communication at a network entity, the apparatus comprising components for performing the method according to any one of claims 18-24.

31. A computer-readable medium storing program code, wherein the program code is executable by one or more processors of a user equipment UE to cause the processors to perform the method according to any one of claims 1-13.

32. A computer-readable medium storing program code, wherein the program code is executable by one or more processors of a network entity to cause the processors to perform the method according to any one of claims 18-24.

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