SWITCHING BETWEEN POLARIZATION AND SPATIAL MULTIPLE-INPUT-MULTIPLE-OUTPUT BASED ON A MULTIBAND ANTENNA

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a first indication of a multiple-input-multiple-output (MIMO) configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The UE may receive a second indication of a MIMO communication configuration that specifies the selection. Numerous other aspects are described.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for switching between polarization and spatial multiple-input-multiple-output (MIMO) based on a multiband antenna.

BACKGROUND

SUMMARY

Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include transmitting a first indication of a multiple-input-multiple-output (MIMO) configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The method may include receiving a second indication of a MIMO communication configuration that specifies the selection.

Some aspects described herein relate to a method of wireless communication performed by a network node. The method may include receiving a first indication of a MIMO configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The method may include transmitting a second indication of a MIMO communication configuration that specifies the selection.

Some aspects described herein relate to an apparatus for wireless communication at a UE. The apparatus may include a memory and one or more processors coupled to the memory. The one or more processors may be configured, individually or collectively, to cause the UE to transmit a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The one or more processors may be configured, individually or collectively, to cause the UE to receive a second indication of a MIMO communication configuration that specifies the selection.

Some aspects described herein relate to an apparatus for wireless communication at a network node. The apparatus may include a memory and one or more processors coupled to the memory. The one or more processors may be configured, individually or collectively, to cause the network node to receive a first indication of a MIMO configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The one or more processors may be configured, individually or collectively, to cause the network node to transmit a second indication of a MIMO communication configuration that specifies the selection.

Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to transmit a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive a second indication of a MIMO communication configuration that specifies the selection.

Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a network node. The set of instructions, when executed by one or more processors of the network node, may cause the network node to receive a first indication of a MIMO configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The set of instructions, when executed by one or more processors of the network node, may cause the network node to transmit a second indication of a MIMO communication configuration that specifies the selection.

Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for transmitting a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The apparatus may include means for receiving a second indication of a MIMO communication configuration that specifies the selection.

Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving a first indication of a MIMO configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The apparatus may include means for transmitting a second indication of a MIMO communication configuration that specifies the selection.

DETAILED DESCRIPTION

Transmitter and/or receiver hardware that is used to communicate using the higher frequencies may have a different configuration relative to transmitter and/or receiver hardware that is used to communicate using the lower frequencies, such as different antenna lengths and/or different impedance matching circuits. Accordingly, the different hardware may process a same carrier frequency differently. A (single) multiband antenna module may support multiple frequency bands and simplify device control of switching between the different frequency bands. A multiband antenna module, such as a multiband antenna module at a user equipment (UE), may process a multiple-input-multiple-output (MIMO) communication differently at different carrier frequencies. Without information that indicates which MIMO configuration provides better performance, a network node scheduling and/or configuring a MIMO communication for the UE may select a MIMO configuration with less performance, resulting in increased data recovery errors, decreased data throughput, and/or decreased signal quality (e.g., increased distortion, reduced signal power, and/or increased interference). Alternatively, or additionally, without the information that indicates a MIMO configuration performance, configuring a multi-layer MIMO communication may add signaling overhead by the network node, especially when switching carrier frequencies. The increased signaling overhead may reduce data throughput and/or increase data-transfer latencies in a wireless network.

Some techniques and apparatuses described herein provide for switching between polarization and spatial MIMO based on a multiband antenna module. In some aspects, a UE may transmit a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration. The MIMO configuration threshold may be based at least in part on a performance threshold, such as a spectral efficiency threshold or a data rate threshold condition. Based at least in part on transmitting the first indication, the UE may receive a second indication of a MIMO communication configuration that specifics the selection.

The indication of a MIMO configuration performance may enable a network node to select a MIMO configuration that improves a performance of the MIMO communication (e.g., an increased data rate and/or an increased spectral efficiency) relative to other MIMO configurations. Selecting a MIMO configuration that improves a performance of the MIMO communication may result in an increased signal quality (e.g., decreased distortion, increased signal power, and/or decreased interference), decreased data recovery errors, and/or increased data throughput. Alternatively, or additionally, the indication of the MIMO configuration performance may enable the network node to reduce signaling overhead, resulting in increased data throughput and/or reduced data-transfer latencies in the wireless network.

In some aspects, a UE (e.g., the UE120) may include a communication manager140. As described in more detail elsewhere herein, the communication manager140may transmit a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold; and receive a second indication of a MIMO communication configuration that specifies the selection. Additionally, or alternatively, the communication manager140may perform one or more other operations described herein.

In some aspects, a network node (e.g., the network node110) may include a communication manager150. As described in more detail elsewhere herein, the communication manager150may receive a first indication of a MIMO configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold; and transmit a second indication of a MIMO communication configuration that specifies the selection. Additionally, or alternatively, the communication manager150may perform one or more other operations described herein.

In some aspects, a UE (e.g., the UE120) includes means for transmitting a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold; and/or means for receiving a second indication of a MIMO communication configuration that specifies the selection. The means for the UE to perform operations described herein may include, for example, one or more of communication manager140, antenna252, modem254, MIMO detector256, receive processor258, transmit processor264, TX MIMO processor266, controller/processor280, or memory282.

In some aspects, a network node (e.g., the network node110) includes means for receiving a first indication of a MIMO configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold; and/or means for transmitting a second indication of a MIMO communication configuration that specifies the selection. The means for the network node to perform operations described herein may include, for example, one or more of communication manager150, transmit processor220, TX MIMO processor230, modem232, antenna234, MIMO detector236, receive processor238, controller/processor240, memory242, or scheduler246.

FIGS.3A and3Bare diagrams illustrating a first example300and a second example302of a single-input-single-output (SISO) system and a MIMO system, respectively, in accordance with the present disclosure.

The first example300shown byFIG.3Aincludes a transmitter device304(e.g., a network node110and/or a UE120) that wirelessly communicates with a receiver device306(e.g., a network node110and/or a UE120) based at least in part on transmitting a wireless signal308. In the first example300, the transmitter device304includes a first (single) antenna310that is used to transmit the wireless signal308, and the receiver device includes a second (single) antenna312to receive the wireless signal308. In some aspects, the transmitter device304and the receiver device306may be configured as a SISO system based at least in part on each device using a single (respective) antenna for transmission and/or reception.

The second example302shown byFIG.3Bincludes a transmitter device314(e.g., a network node110and/or a UE120) and a receiver device316(e.g., a network node110and/or a UE120) that wirelessly communicate with one another based at least in part on multiple antennas. To illustrate, the transmitter device314may include M antennas as shown by reference number318, and the receiver device316may include N antennas as shown by reference number320, where M and N are integers that may be equal or different from one another (e.g., M=N, M>N, and/or M<N). In some aspects, each antenna of the transmitter device314may transmit respective data based at least in part on using spatial diversity and/or polarization diversity. As one non-limiting example, a first antenna may transmit a first signal322(shown with a solid line), a second antenna may transmit a second signal324(shown with a dashed line), up to an M-th antenna that transmits an M-th signal326(shown with a dotted line). Relative to a SISO transmission, a MIMO transmission may increase data throughput based at least in part on the ability to transmit different data streams based at least in part on using diverse signals. To illustrate, the transmitter device314may generate the diverse signals using spatial multiplexing and/or polarization multiplexing.

“Spatial multiplexing” may denote generating spatially diverse signal transmissions. To illustrate, and as described above, the transmitter device314may apply precoding to a first signal that is based at least in part on a first carrier frequency such that the first signal propagates in a first direction with a first spatial beamwidth. That is, the transmitter device314may beamform the first signal based at least in part on a first propagation direction and/or a first spatial beamwidth. In some aspects, the first signal carries first data. Alternatively, or additionally, the transmitter device314may apply precoding to a second signal that is based at least in part on a second carrier frequency (e.g., that may be the same carrier frequency as the first carrier frequency or a different carrier frequency from the first carrier frequency) such that the second signal propagates in a second direction with a second spatial beamwidth. In some aspects, the second signal may carry second data that is different from the first data. The transmitter device314may select the second propagation direction and/or the second spatial beamwidth to mitigate and/or avoid overlap with the first propagation direction and/or the first spatial beamwidth. That is, the first signal and the second signal may be spatially diverse based at least in part on propagating in non-overlapping directions with non-overlapping spatial beamwidths (or partially overlapping directions and/or spatial beamwidths).

“Polarization multiplexing” may denote transmitting at least two signals that have diverse polarizations. To illustrate, an electromagnetic (EM) wave may include an electric field (E-field) and magnetic field (H-field) that propagate along a same propagation line (e.g., a same direction) and are perpendicular to one another. For example, in an XYZ coordinate system that is characterized by an X-plane, a Y-plane, and a Z-plane that are perpendicular to one another, the E-field of the EM wave is separated from the H-field by 90 degrees. Accordingly, if an E-field that propagates along an X-axis with an amplitude that varies along the Y-axis (e.g., within a horizontal X-Y plane), the H-field may also propagate along the X-axis with an amplitude that varies along the Z-axis (e.g., in a perpendicular, vertical X-Z plane). In linear polarization, the E-field and the H-field may propagate without rotating around the propagation line, while in circular polarization, the E-field and the H-field may rotate around the propagation line. In some aspects, the transmitter device314may transmit a first signal that is based at least in part on a first carrier frequency and a first polarization. Alternatively, or additionally, the transmitter device314may transmit a second signal that is based at least in part on a second carrier frequency (e.g., that may be the same carrier frequency as the first carrier frequency or a different carrier frequency from the first carrier frequency) and a second polarization that is orthogonal to the first polarization. That is, the first signal and the second signal may have diverse polarizations. For example, the E-field of the first signal is orthogonal to the E-field of the second signal, and the H-field of the first signal is orthogonal to the H-field of the second signal. In some aspects, the first signal may carry first data, and the second signal may carry second data that is different from the first data. To illustrate, the transmitter device314may include at least a first antenna that is configured to generate a first signal that has a first polarization and a second antenna that is configured to generate a second signal that has a second polarization.

The demand for services provided by a wireless network continues to increase as more and more devices access the wireless network. The availability of communication resources (e.g., frequency resources and/or time resources) to provide these services becomes proportionally strained as the number of devices accessing the wireless network increases. As an added complexity, some devices may request increased data throughput and/or lower data-transfer latency relative to other devices, such as when a device executes an application that consumes large quantities of data and/or has time-sensitive needs (e.g., streaming video, streaming audio, video calling, gaming, and/or emergency services). MIMO communications may help increase data throughput based at least in part on transmitting multiple data streams using diverse signals. Another solution to addressing the demand for more communication resources may include using higher frequencies, such as higher frequency bands that are included in FR2.

Transmitter and/or receiver hardware that is used to communicate using the higher frequencies may have a different configuration relative to transmitter and/or receiver hardware that is used to communicate using the lower frequencies. As one example, a first antenna module that is designed for a lower frequency may differ from a second antenna module that is designed for a higher frequency. To illustrate, the first antenna module may utilize a different inter-antenna element spacing and/or have a different impedance matching circuit relative to the second antenna module to maximize an amount of power transferred through the antenna. That is, the first antenna module and the second antenna module may utilize different hardware configurations to improve a quality of a transmitted and/or received signal (e.g., increased signal power and/or reduced distortion).

Supporting multiple frequency bands based at least in part on multiple antenna modules (e.g., frequency-band specific antenna modules) may be expensive in terms of cost, design, space, and/or real-estate (e.g., at the UE side). To illustrate, designing multiple antenna modules may increase a design time and/or increase an amount of hardware included in a wireless computing device and, subsequently, increase a cost associated with the wireless computing device. In some aspects, the wireless computing device, such as a UE120, may have less space relative to other wireless computing device to include multiple antenna modules. Alternatively, or additionally, control of multiple antenna modules may introduce more complexity that increases an amount of overhead processing at the UE. To compensate for a lack of space and simplify antenna control, some wireless communication devices may include a (single) multiband antenna module that supports multiple frequency bands. The inclusion of a multiband antenna module may enable a wireless communication device to wirelessly communicate over a larger range of frequencies relative to a single antenna module that is configured for a particular frequency band while meeting space constraints of smaller wireless communication devices.

Some techniques and apparatuses described herein provide for switching between polarization and spatial MIMO based on a multiband antenna module. In some aspects, a UE may transmit a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration. The MIMO configuration threshold may be based at least in part on a performance threshold, such as a spectral efficiency threshold or a data rate threshold. To illustrate, the MIMO configuration threshold may indicate a performance of a polarization MIMO configuration and/or a spatial MIMO configuration based at least in part on a carrier frequency. Based at least in part on transmitting the first indication, the UE may receive a second indication of a MIMO communication configuration that specifies the selection. For example, a network node may select the MIMO communication configuration based at least in part on a carrier frequency associated with a MIMO communication configuration between the network node and the UE.

A UE may indicate a performance of a spatial MIMO configuration and/or a polarization MIMO configuration that is based at least in part on a carrier frequency and/or an angular spread as described below. The indication of a MIMO configuration performance may enable a network node to select a MIMO configuration that improves a performance of the MIMO communication (e.g., an increased data rate and/or an increased spectral efficiency) relative to other MIMO configurations. Selecting a MIMO configuration that improves a performance of the MIMO communication may result in an increased signal quality (e.g., decreased distortion, increased signal power, and/or decreased interference), decreased data recovery errors, and/or increased data throughput. Alternatively, or additionally, the indication of the MIMO configuration performance may enable the network node to reduce signaling overhead based at least in part on frequency selection and/or a MIMO configuration selection. Reducing signaling overhead may increase data throughput and/or reduce data-transfer latencies in the wireless network.

As indicated above,FIGS.3A and3Bare provided as examples. Other examples may differ from what is described with regard toFIGS.3A and3B.

FIGS.4A,4B, and4Care diagrams illustrating a first example400of a multiband antenna module, a second example402of correlation coefficient charts based at least in part on a carrier frequency and angular spread, and a third example404of

MIMO performance versus frequency charts, respectively, in accordance with the present disclosure.

FIG.4Aincludes an antenna module component406that includes multiband capabilities. That is, the antenna module component406may be configured as a multiband antenna module that is capable of transmitting and/or receiving wireless communications over a range of frequency bands (e.g., in FR1 and/or FR2), such as a low-band (LB) that spans 24.25-29.5 GHZ, a mid-band (MB) that spans 37-43.5 GHZ, and a high-band (HB) that spans 47.2-48.2 GHZ. In some aspects, the antenna module component406may include multiple frequency band-specific antenna components, such as multiple LB antenna components, multiple MB antenna components, and/or multiple HB antenna components. In one example, and as shown byFIG.4A, the antenna module component406includes a first set of LB antenna components (shown as LB antenna component408-1, LB antenna component408-2, LB antenna component408-3, LB antenna component408-4, and LB antenna component408-5) and a second set of MB/HB antenna components (shown as MB/HB antenna component410-1, MB/HB antenna component410-2. MB/HB antenna component410-3, MB/HB antenna component410-4, and MB/HB antenna component410-5). Accordingly, a device that includes the antenna module component406, such as a UE120, may transmit and/or receive wireless communications in an LB based at least in part on the LB antenna components, and transmit and/or receive wireless communications in an MB and/or an HB based at least in part on the MB/HB antenna components. To illustrate, the first set of LB antenna components may act as a first antenna array, and the second set of MB/HB antenna components may act as a second antenna array. Each antenna component, such as the LB antenna component408-1and/or the MB/HB antenna component410-1, may include one or more antennas, such as a first antenna with a first polarization and/or orientation (e.g., vertical) and a second antenna with a second polarization and/or orientation (e.g., horizontal).

An isolation and/or independence of antenna elements from one another may affect a signal quality of a MIMO communication. To illustrate, two antennas that have high isolation and/or independence from one another may have radiation patterns that differ from one another and/or are uncorrelated. Conversely, two antennas that have low isolation and/or low independence from one another may have radiation patterns that are similar (e.g., each has a propagation direction that is within a direction difference threshold and/or a spatial width that is within a width difference threshold). Accordingly, two antennas with high isolation and/or high independence may be more suitable for a spatial MIMO communication based at least in part on the isolation of the antennas being able to mitigate spatial overlap of two signals. Alternatively, or additionally, two antennas with low isolation and/or low independence from one another may be more suitable for a polarization MIMO communication based at least in part on the dependence and/or correlation between the two antennas, thus allowing for an increased coherent energy transfer performed by the antennas.

In statistics, a correlation coefficient is a measure of a relationship and/or dependence between two variables. For two antennas, a correlation coefficient may be calculated based at least in part on a variety of factors, such as a physical distance between the antenna elements, a carrier frequency for a communication using the antennas, a polarization intended by each antenna, and/or a signal power level of each antenna. As one example, a correlation between a first variable X and a second variable Y may be calculated based at least in part on:

FIG.4Bincludes a first correlation coefficient chart412that is associated with a first frequency (e.g., 24.25 GHz), a second correlation coefficient chart414that is associated with a second frequency (e.g., 37 GHZ) and a third correlation coefficient chart416that is associated with a third frequency (e.g., 47.7 GHZ). Each correlation coefficient chart is based at least in part on a set of antenna elements (shown on a horizontal axis). In some aspects, each correlation coefficient chart may be based at least in part on the antenna module component406as described with regard toFIG.4A.

The set of antenna elements include a first subset of co-polarized antenna elements and a second subset of cross-polarized antenna elements. That is, the antenna elements included in the first subset are co-polarized with one another, and the antenna elements included in the second subset are co-polarized with one another, but the first subset and the second subset are cross-polarized with one another. A vertical axis of each correlation coefficient chart represents a correlation coefficient that is calculated between two antennas. To illustrate, the set of antenna elements may include 10 antenna elements that are labeled as “1”, “2”, up to “10”. The first sub-set of co-polarized antenna elements may include the antenna elements that are labeled from1-5, and the second subset of cross-polarized antenna elements may include the antenna elements that are labeled from6-10. Each correlation coefficient is based at least in part on an antenna pairing between a reference antenna element (e.g., antenna 1) and each respective other antenna element in the set (e.g., antennas 2-10).

InFIG.4B, a labeling of each antenna is based at least in part on an inter-antenna element spacing and/or distance between antenna elements. That is, for a reference antenna labeled as antenna 1, a second antenna with an increase in number indicates a larger distance from the reference antenna. For example, the reference antenna (e.g., antenna 1) and antenna 2 of the first set of co-polarized antennas may be separated by a distance from one another, such as a first distance between LB antenna component408-1and LB antenna component408-2and/or a second distance between MB/HB antenna component410-1and MB/HB antenna component410-2. Antenna 3 (e.g., LB antenna component408-3and/or MB/HB antenna component410-3) may be separated from antenna 2 by the same distance but may be separated from the reference antenna by twice the distance. Accordingly, for the first sub-set of co-polarized antennas, antenna 2 may be closest to the reference antenna relative to antennas 3, 4, and 5, and antenna 5 may be separated from the reference antenna by a larger distance than antennas 2, 3, and 4. Alternatively, or additionally, two cross-polarized antennas may be included in a same antenna component (e.g., the LB antenna component408-1or the MB/HB antenna component410-1). For example, antenna 1 and antenna 6, which are cross-polarized with one another, may be included in a first antenna component, and antenna 2 and antenna 7 may be included in a second antenna component. InFIG.4B, antenna 6 is a second reference antenna with regard to the second set of cross-polarized antennas. Accordingly, a labeling of each antenna in the second set of cross-polarized antennas (e.g., cross-polarized with the first set of co-polarized antennas) is based at least in part on an inter-antenna element spacing. Each correlation coefficient chart also includes, for each antenna pairing, a correlation coefficient that is based at least in part on a respective angular spread (e.g., 10°, 20°, 30°. 40°, 60°, 90° and 180° in elevation and an azimuth that covers 0°-360°) associated with a dominant cluster in a communication channel. “Dominant cluster” may denote a group of paths and/or rays associated with an object in the channel environment with commensurate properties (e.g., a propagation path and/or a spatial beamwidth that are within a threshold and/or within a range of one another) that form a majority of signal propagation from that object in the communication channel. A correlation coefficient with a value of “1” indicates a high correlation between the antenna pairing and a correlation coefficient with a value of “0” indicates a low correlation between the antenna pairing.

As shown by the correlation coefficient charts ofFIG.4B(e.g., the first correlation coefficient chart412, the second correlation coefficient chart414, and the third correlation coefficient chart416), a correlation of co-polarized antennas may reduce as the frequency increases and/or the inter-antenna element spacing increases. That is, a correlation between the reference antenna element (e.g., antenna 1) and other antennas with a same polarization (e.g., antennas 2-5) trends downward with less correlation as the frequency and/or separation distance increases. As also shown by the correlation coefficient charts, a correlation of the reference antenna with cross-polarized antenna(s) may increase and/or trend upwards (e.g., have higher correlation) as the frequency increases. Alternatively, or additionally, the correlation coefficient charts may indicate that a correlation between co-polarized antenna elements may decrease as an angular spread of the dominant cluster in the communication channel increases (e.g., due to averaging effects).

The above observations associated with the first correlation coefficient chart412, the second correlation coefficient chart414, and the third correlation coefficient chart416(e.g., a downward trend in correlation for co-polarized antenna elements as frequency increases, an upward trend in correlation between cross-correlation antenna elements as the frequency increases, and/or a downward trend in correlation as an angular spread of a dominant cluster increases) may differ based at least in part on a variety of factors, such as antenna design, a distance between antenna elements, antenna placement, antenna design, and/or one or more supported carrier frequencies. That is, the first correlation coefficient chart412, the second correlation coefficient chart414, and the third correlation coefficient chart416provide a correlation coefficient analysis for a same antenna module component (e.g., the antenna module component406) at three carrier frequencies, and the above observations may differ for other frequencies and/or other antenna module components.

MIMO communications may include multiple layers, and each layer may be associated with a respective data stream. To illustrate, a 2-layer MIMO communication may include two data streams and a 4-layer MIMO communication may include four data streams. A 2-layer polarization MIMO communication may transmit a first data stream based at least in part on a first signal that has a first polarization, and a second data stream based at least in part on a second signal that has a second polarization (e.g., that is orthogonal to the first polarization). A 4-layer spatial MIMO communication may transmit each data stream of four data streams based at least in part on a respective beam of four beams that do not spatially overlap.

As shown byFIG.4B, the first correlation coefficient chart412may indicate that polarization MIMO is suitable (e.g., polarization MIMO may mitigate data recovery errors) at multiple angular spreads for lower frequencies (e.g., 24.25 GHZ). To illustrate, at a carrier frequency of 24.25 GHZ, antennas that are adjacent and/or close (e.g., within a distance threshold) to the reference antenna have a correlation coefficient of 0.7 or greater for each angular spread (e.g., 10°, 20°, 30°, 40°, 60°, 90° and 180°). That is, the correlation coefficient of the antenna pairing(s) between the reference antenna and the adjacent and/or close antenna(s) satisfies a polarization MIMO threshold (e.g., that indicates a high correlation). Alternatively, or additionally, the high correlation coefficient may indicate that spatial MIMO is unsuitable (e.g., may result in data recovery errors). That is, the correlation coefficient of each antenna pairing of the first set of co-polarized antennas may fail to satisfy a spatial MIMO threshold (e.g., that indicates a low correlation). However, and as shown by the third correlation coefficient chart416, the correlation coefficient of at least some antenna pairings may fail to satisfy the polarization MIMO threshold for one or more angular spreads. Accordingly, polarization MIMO may be unsuitable for some angular spreads at higher frequencies. That is, polarization MIMO may result in degraded signal quality for a transmission that has a particular angular spread and a higher carrier frequency (e.g., 47.7 GHZ). Alternatively, or additionally, for some angular spreads, the correlation coefficient of the antenna pairings may satisfy the spatial MIMO threshold. Thus, spatial MIMO may be suitable at higher carrier frequencies for some angular spreads.

FIG.4Cincludes a first performance chart418and a second performance chart420. The first performance chart418illustrates an example performance of polarization MIMO based at least in part on frequency and an angular spread, and the second performance chart420provides an example performance of spatial MIMO based at least in part on frequency and angular spread. Accordingly, a horizontal axis of each performance chart represents frequency and a vertical axis of each chart represents an angular spread (e.g., of a dominant cluster in a communication channel). Each performance chart also identifies a maximum angular spread through the use of a dashed line. In some aspects, the first performance chart418and/or the second performance chart420may be associated with a spectral efficiency performance. Alternatively, or additionally, the first performance chart418and/or the second performance chart420may be associated with a data rate performance.

The first performance chart418includes a first threshold422that delincates, distinguishes, and/or identifies when polarization MIMO satisfies a performance condition and/or when polarization MIMO fails to satisfy the performance condition, such as a particular data rate and/or a particular spectral efficiency. For example, the first threshold422may be based at least in part on a frequency, an angular spread, one or more correlation coefficients, and/or a performance condition (e.g., a particular data rate and/or a particular spectral efficiency). To illustrate, the first threshold422may be based at least in part on a set of correlation coefficients that are generated based at least in part on one or more carrier frequencies and/or one or more angular spreads as described with regard toFIG.4B. Accordingly, the first threshold422may indicate that a first polarization MIMO communication that is based at least in part on a first carrier frequency and a first angular spread (e.g., characterized by a first point424) may satisfy the performance condition. Alternatively, or additionally, the first threshold422may indicate that a second polarization MIMO communication that is based at least in part on a second carrier frequency and a second angular spread (e.g., characterized by a second point426) may fail to satisfy the performance condition. As shown byFIG.4C, the first threshold422indicates that polarization MIMO may fail to satisfy a performance condition as a carrier frequency increases for some antenna modules.

The second performance chart420includes a second threshold428that delineates, distinguishes, and/or identifies when spatial MIMO satisfies a performance condition and/or when spatial MIMO fails to satisfy the performance condition, such as a particular data rate and/or a particular spectral efficiency. In a similar manner as the first threshold422, the second threshold428may be based at least in part on a frequency, an angular spread, one or more correlation coefficients, and/or a performance condition. Accordingly, the second threshold428may indicate that a first spatial MIMO communication that is based at least in part on a first carrier frequency and a first angular spread (e.g., characterized by a third point430) may fail to satisfy the performance condition, and that a second spatial MIMO communication at a second carrier frequency and second angular spread (e.g., characterized by a fourth point432) may satisfy the performance condition. Accordingly, and as shown byFIG.4C, spatial MIMO may satisfy a performance condition as a carrier frequency increases for some antenna modules.

As described above, a correlation coefficient may provide an indication of performance of an antenna module (e.g., a multiband antenna module) for a polarization MIMO communication and/or a spatial MIMO communication. A MIMO configuration threshold that is based at least in part on correlation coefficients for multiple frequencies and/or angular spreads of a dominant cluster in a communication channel may enable a network node110configure a MIMO communication with a preferred MIMO configuration (e.g., polarization MIMO configuration or spatial MIMO configuration) that improves a performance of the MIMO communication (e.g., an increased data rate and/or an increased spectral efficiency) relative to other MIMO configurations. Selecting a MIMO configuration that improves a performance of the MIMO communication may result in an increased signal quality (e.g., decreased distortion, increased signal power, and/or decreased interference), decreased data recovery errors, and/or increased data throughput.

As indicated above,FIGS.4A,4B,4Care provided as examples. Other examples may differ from what is described with regard toFIGS.4A,4B, and4C.

FIG.5is a diagram illustrating an example500of a wireless communication process between a network node (e.g., the network node110) and a UE (e.g., the UE120), in accordance with the present disclosure.

As shown by reference number510, a network node110may transmit, and a UE120may receive, an indication of a request for a MIMO configuration threshold, such as a request for one or more frequency-dependent channel parameters such as gains over an angular spread, and/or angular spread thresholds that indicate a MIMO configuration performance based at least in part on a carrier frequency and/or an angular spread. For example, the network node110may indicate a request for a first frequency-dependent angular spread threshold that increases with frequency (e.g., a polarization MIMO configuration threshold) and/or a second frequency-dependent angular spread threshold that decreases with frequency (e.g., a spatial MIMO configuration threshold). A frequency-dependent angular spread threshold may indicate one or more carrier frequencies and/or angular spreads in which a polarization MIMO configuration satisfies and/or fails to satisfy a performance threshold as described with regard toFIG.4C. Alternatively, or additionally, a frequency-dependent angular spread threshold may indicate one or more carrier frequencies and/or angle spreads in which a spatial MIMO configuration satisfies and/or fails to satisfy a performance threshold as described with regard toFIG.4C.

The network node110may transmit the indication in Layer 1 signaling (e.g., downlink control information (DCI)), Layer 2 signaling (e.g., a medium access control (MAC) control element (CE)), and/or Layer 3 signaling (e.g., a radio resource control (RRC) message). In some aspects, the network node110may explicitly request the MIMO configuration threshold(s), such as by setting a bit field (e.g., in an RRC message, in DCI, and/or in a MAC CE) to a value (e.g., “1” or “0”) that specifies the request. As one example, the network node110may set a bit field in a UE capability information request message to the value. In other aspects, the network node110may implicitly request the MIMO configuration threshold(s), such as by transmitting a request for UE capability information without including the bit field and/or without setting the bit field.

In transmitting an indication of a request for the MIMO configuration threshold, the network node110may alternatively or additionally indicate a request for a performance threshold that is associated with the MIMO configuration threshold. For example, the network node110may request a data rate performance threshold that is associated with a polarization MIMO configuration threshold and/or a spatial MIMO configuration threshold. To illustrate, and as described with regard toFIG.4C, the first threshold422may be based at least in part on a data rate performance threshold such that a first polarization MIMO communication that is based at least in part on a carrier frequency and angular spread above the first threshold422may satisfy the data rate performance threshold, and a second polarization MIMO communication that is based at least in part on a carrier frequency and angular spread below the first threshold422may fail to satisfy the data rate performance threshold. Accordingly, the network node110may indicate a request for a performance threshold associated with the polarization MIMO configuration threshold. Alternatively, or additionally, the network node110may indicate a request for a performance threshold associated with a spatial MIMO configuration threshold.

As shown by reference number520, the UE120may transmit, and the network node110may receive, an indication of one or more MIMO configuration thresholds. Alternatively, or additionally, and as shown by reference number530, the UE120may transmit, and the network node110may receive, an indication of one or more performance thresholds that are associated with a respective MIMO configuration threshold, such as a spectral efficiency performance threshold and/or a data rate performance threshold. In some aspects, the performance threshold may be specific to a MIMO configuration, such as a polarization MIMO performance threshold for a first frequency-dependent angular spread threshold that is associated with polarized MIMO communications and/or a spatial MIMO performance threshold for a second frequency-dependent angular spread threshold that is associated with spatial MIMO communications. While the example500shows the indication of the MIMO configuration threshold being signaled separately from the indication of the performance threshold, other examples may include the MIMO configuration threshold and the performance threshold being signaled together in a single transmission.

The UE120may transmit the indication of the MIMO configuration threshold and/or the performance threshold in Layer 1 signaling (e.g., uplink control information (UCI)), Layer 2 signaling (e.g., a MAC CE), and/or Layer 3 signaling (e.g., an RRC message). As one example, the UE120may indicate the MIMO configuration threshold(s) and/or the performance threshold(s) in UE capability information. In some aspects, to indicate a MIMO configuration threshold, the UE120may indicate an angle and/or slope. To illustrate, the UE120may indicate the angle and/or slope of the first threshold422and/or the second threshold428. The angle and/or slope may be based at least in part on a span of frequencies and/or a span of angular spreads. The UE120may alternatively or additionally indicate if the MIMO configuration threshold increases with frequency or decreases with frequency.

In some aspects, the UE120may obtain the MIMO configuration threshold information and/or performance threshold(s) from memory. As one example, a manufacturing, assembly, calibration, and/or verification process associated with the UE120may programmatically generate and/or store the MIMO configuration threshold information and/or performance threshold(s) in memory of the UE120. Alternatively, or additionally, an operator may manually store and/or update the MIMO configuration threshold information in memory of the UE120(e.g., programmatically). In some aspects, the UE120may calculate and/or update the MIMO configuration information based at least in part on calculating correlation coefficients of co-polarized antenna elements and/or cross-polarized antenna elements.

In some aspects, the UE120may receive one or more reference signals, such as one or more channel state information reference signals (CSI-RSs), and generate one or more metrics that characterize a communication channel and/or how the UE120observes the communication channel. The UE120observations may be based at least in part on an antenna module (e.g., a multiband antenna module). The UE120May calculate and/or update the MIMO configuration threshold based at least in part on the one or more metrics. To illustrate, the UE120may calculate, as the one or more metrics, one or more correlation coefficients for antenna elements included in the UE120based at least in part on the reference signals, such as one or more correlation coefficients for co-polarized antenna elements and/or one or more correlation coefficients for cross-polarized antenna elements included in a multiband antenna module that includes M antenna elements. The UE120may update the MIMO configuration threshold based at least in part on the correlation coefficient(s) and/or a performance threshold. Alternatively, or additionally, the UE120may obtain the update to the MIMO configuration threshold from memory. To illustrate, the MIMO configuration threshold information stored in memory may include multiple MIMO configuration thresholds that are each associated with a respective signal metric. Based at least in part on the one or more signal metrics associated with the reference signal(s), the UE120may select a new MIMO configuration threshold that is associated with the generated signal metric(s). Accordingly, the UE120may indicate the updated MIMO configuration threshold to the network node110.

As shown by reference number540, the network node110may select a MIMO communication configuration. As one example, the network node110may assign an air interface resource to MIMO communications with the UE120based at least in part on a carrier frequency. In some aspects, the network node110may select between a polarized MIMO configuration and a spatial MIMO configuration for the MIMO communication based at least in part on the MIMO configuration threshold and/or the performance threshold received from the UE120. For example, a quality-of-service (QOS) flow may have a data rate condition and/or data throughput condition, and the network node110may select the MIMO communication configuration based at least in part on a MIMO configuration threshold that is associated with a data rate performance threshold and/or a spectral efficiency performance threshold that satisfies the data rate condition and/or the data throughput condition. Alternatively, or additionally, the network node110may select between polarized MIMO configuration and spatial MIMO configuration for the MIMO communication based at least in part on an angular spread. To illustrate, the network node110may measure an angular spread of a dominant cluster in the communication channel based at least in part on an uplink communication and/or may receive an indication of the angular spread from the UE120and based at least in part on a downlink communication. In some aspects, the network node110may estimate the angular spread based at least in part on a spatial width of a downlink beam and/or an uplink beam.

As shown by reference number550, the network node110may transmit, and a UE120may receive, an indication of the MIMO communication configuration. The network node110may transmit the indication of the MIMO communication configuration in Layer 1 signaling. Layer 2 signaling, and/or Layer 3 signaling.

As shown by reference number560, the network node110and the UE120may communicate with one another based at least in part on using the MIMO communication configuration. For example, the network node110may transmit a downlink MIMO communication based at least in part on the MIMO communication configuration and/or the UE120may recover information from the downlink MIMO communication based at least in part on the MIMO communication configuration. Alternatively, or additionally, the UE120may transmit an uplink MIMO communication based at least in part on the MIMO communication configuration and/or the network node110may recover information from the uplink MIMO communication based at least in part on the MIMO communication configuration.

As shown by reference number570, the UE120may obtain an update to the MIMO configuration threshold. As one example, the UE120may generate a signal metric (e.g., RSSI, RSRP, and/or CQI) that indicates a communication channel has changed by at least a threshold. Based at least in part on the signal metric changing by at least a threshold, the UE120may calculate one or more updates to the MIMO configuration threshold. Alternatively, or additionally, the UE120may obtain the update to the MIMO configuration threshold from memory. To illustrate, and as described above, the MIMO configuration threshold information stored in memory may include multiple MIMO configuration thresholds that are each associated with a respective signal metric. Based at least in part on the signal metric changing by at least a threshold, the UE120may select a new MIMO configuration threshold that is associated with the generated signal metric.

As shown by reference number580, the UE120may transmit, and the network node110may receive, an indication of the update to the MIMO configuration threshold. The UE120may iteratively obtain updates to the MIMO configuration and indicate the update to the MIMO configuration to the network node110.

A UE indicating a MIMO configuration threshold to a network node, such as a MIMO configuration threshold that is based at least in part on a frequency-dependent angular spread of a dominant cluster, may enable the network node to configure a MIMO communication with a preferred MIMO configuration (e.g., polarization MIMO configuration or spatial MIMO configuration) that improves a performance of the MIMO communication (e.g., an increases data rate and/or an increased spectral efficiency) relative to other MIMO configurations. Alternatively, or additionally, the UE indicating the MIMO configuration threshold to the network node may enable the network node to configure the MIMO communication using less signaling overhead (e.g., by reducing an amount of signaling overhead that is associated with communicating TCI state information). Selecting a MIMO configuration that improves a performance of the MIMO communication may result in an increased signal quality (e.g., decreased distortion, increased signal power, and/or decreased interference) that reduces data recovery errors and/or increases data throughput. Reducing signaling overhead may also increase an amount of air interface resources available for communicating user data, thus increasing data throughput and/or reducing data-transfer latencies in a wireless network.

FIG.6is a diagram illustrating an example process600performed, for example, by a UE, in accordance with the present disclosure. Example process600is an example where the UE (e.g., UE120) performs operations associated with switching between polarization and spatial multiple-input-multiple-output based on an antenna module.

As shown inFIG.6, in some aspects, process600may include transmitting a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold (block610). For example, the UE (e.g., using transmission component804and/or communication manager806, depicted inFIG.8) may transmit a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold, as described above.

As further shown inFIG.6, in some aspects, process600may include receiving a second indication of a MIMO communication configuration that specifies the selection (block620). For example, the UE (e.g., using reception component802and/or communication manager806, depicted inFIG.8) may receive a second indication of a MIMO communication configuration that specifies the selection, as described above.

In a first aspect, process600includes transmitting a third indication of the performance threshold.

In a second aspect, the performance threshold includes at least one of a spectral efficiency performance threshold, or a data rate performance threshold.

In a third aspect, the performance threshold includes at least one of a polarization MIMO performance threshold, or a spatial MIMO performance threshold.

In a fourth aspect, the MIMO configuration threshold includes a frequency-dependent angular spread threshold that indicates a polarization MIMO performance based at least in part on a carrier frequency and an angular spread of the dominant clusters in the channel between the UE and a network node.

In a fifth aspect, the MIMO configuration threshold includes a frequency-dependent angular spread threshold that indicates a spatial MIMO performance based at least in part on a carrier frequency and an angular spread of the dominant clusters in the channel between the UE and the network node.

In a sixth aspect, transmitting the first indication of the MIMO configuration threshold includes transmitting the first indication of the MIMO configuration threshold in UE capability information.

In a seventh aspect, process600includes obtaining an updated MIMO configuration threshold based at least in part on a set of reference signals, and transmitting a third indication of the updated MIMO configuration threshold.

In an eighth aspect, process600includes calculating one or more correlation coefficients associated with M antenna elements based at least in part on one or more frequencies and one or more angular spreads, where M is an integer, and the MIMO configuration threshold is based at least in part on the one or more correlation coefficients.

In a ninth aspect, calculating the one or more correlation coefficients includes at least one of calculating a first correlation coefficient for two co-polarized antenna elements of the M antenna elements, or calculating a second correlation coefficient for two cross-polarized antenna elements of the M antenna elements.

In a tenth aspect, process600includes selecting a reference antenna element from the M antenna elements, calculating, as a first subset of the one or more correlation coefficients, a respective co-polarized correlation coefficient between the reference antenna element and each co-polarized antenna element within the M antenna elements, and calculating, as a second subset of the one or more correlation coefficients, a respective cross-polarized correlation coefficient between the reference antenna element and each cross-polarized antenna element within the M antenna elements.

In an eleventh aspect, the M antenna elements are included in a multiband antenna component.

In a twelfth aspect, process600includes communicating with another device based at least in part on the MIMO communication configuration.

FIG.7is a diagram illustrating an example process700performed, for example, by a network node, in accordance with the present disclosure. Example process700is an example where the network node (e.g., network node110) performs operations associated with switching between polarization and spatial multiple-input-multiple-output based on an antenna module.

As shown inFIG.7, in some aspects, process700may include receiving a first indication of a MIMO configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold (block710). For example, the network node (e.g., using reception component902and/or communication manager906, depicted inFIG.9) may receive a first indication of a MIMO configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold, as described above.

As further shown inFIG.7, in some aspects, process700may include transmitting a second indication of a MIMO communication configuration that specifies the selection (block720). For example, the network node (e.g., using transmission component904and/or communication manager906, depicted inFIG.9) may transmit a second indication of a MIMO communication configuration that specifies the selection, as described above.

In a first aspect, process700includes performing the selection between the polarized MIMO configuration and the spatial MIMO configuration based at least in part on the MIMO configuration threshold.

In a second aspect, performing the selection includes performing the selection based at least in part on at least one of a carrier frequency, or an angular spread.

In a third aspect, process700includes receiving a third indication of the performance threshold.

In a fourth aspect, the performance threshold includes at least one of a spectral efficiency performance threshold, or a data rate performance threshold.

In a fifth aspect, the performance threshold includes at least one of a polarized MIMO performance threshold, or a spatial MIMO performance threshold.

In a sixth aspect, the MIMO configuration threshold includes a frequency-dependent angular spread threshold that indicates a polarized MIMO performance based at least in part on a carrier frequency and an angular spread.

In a seventh aspect, the MIMO configuration threshold includes a frequency-dependent angular spread threshold that indicates a spatial MIMO performance based at least in part on a carrier frequency and an angular spread.

In an eighth aspect, receiving the first indication of the MIMO configuration threshold includes receiving the first indication of the MIMO configuration threshold in UE capability information.

In a ninth aspect, process700includes receiving a third indication of an updated MIMO configuration threshold, and selecting an updated MIMO communication configuration based at least in part on the updated MIMO configuration threshold.

In a tenth aspect, the MIMO configuration threshold is associated with a UE, and process600includes communicating with the UE based at least in part on the MIMO communication configuration.

FIG.8is a diagram of an example apparatus800for wireless communication, in accordance with the present disclosure. The apparatus800may be a UE, or a UE may include the apparatus800. In some aspects, the apparatus800includes a reception component802, a transmission component804, and/or a communication manager806, which may be in communication with one another (for example, via one or more buses and/or one or more other components). In some aspects, the communication manager806is the communication manager140described in connection withFIG.1. As shown, the apparatus800may communicate with another apparatus808, such as a UE or a network node (such as a CU, a DU, an RU, or a base station), using the reception component802and the transmission component804.

The communication manager806may support operations of the reception component802and/or the transmission component804. For example, the communication manager806may receive information associated with configuring reception of communications by the reception component802and/or transmission of communications by the transmission component804. Additionally, or alternatively, the communication manager806may generate and/or provide control information to the reception component802and/or the transmission component804to control reception and/or transmission of communications.

The transmission component804may transmit a first indication of a MIMO configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The reception component802may receive a second indication of a MIMO communication configuration that specifies the selection.

The transmission component804may transmit a third indication of the performance threshold.

The communication manager806may obtain an updated MIMO configuration threshold based at least in part on a set of reference signals.

The transmission component804may transmit a third indication of the updated MIMO configuration threshold.

The communication manager806may calculate one or more correlation coefficients associated with M antenna elements based at least in part on one or more frequencies and one or more angular spreads, where M is an integer.

The communication manager806may select a reference antenna element from the M antenna elements.

The communication manager806may calculate, as a first subset of the one or more correlation coefficients, a respective co-polarized correlation coefficient between the reference antenna element and each co-polarized antenna element within the M antenna elements.

The communication manager806may calculate, as a second subset of the one or more correlation coefficients, a respective cross-polarized correlation coefficient between the reference antenna element and each cross-polarized antenna element within the M antenna elements.

The communication manager806may communicate with another device based at least in part on the MIMO communication configuration.

FIG.9is a diagram of an example apparatus900for wireless communication, in accordance with the present disclosure. The apparatus900may be a network node, or a network node may include the apparatus900. In some aspects, the apparatus900includes a reception component902, a transmission component904, and/or a communication manager906, which may be in communication with one another (for example, via one or more buses and/or one or more other components). In some aspects, the communication manager906is the communication manager150described in connection withFIG.1. As shown, the apparatus900may communicate with another apparatus908, such as a UE or a network node (such as a CU, a DU, an RU, or a base station), using the reception component902and the transmission component904.

The reception component902may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus908. The reception component902may provide received communications to one or more other components of the apparatus900. In some aspects, the reception component902may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus900. In some aspects, the reception component902may include one or more antennas, a modem, a demodulator, a MIMO detector, a receive processor, a controller/processor, a memory, or a combination thereof, of the network node described in connection withFIG.2. In some aspects, the reception component902and/or the transmission component904may include or may be included in a network interface. The network interface may be configured to obtain and/or output signals for the apparatus900via one or more communications links, such as a backhaul link, a midhaul link, and/or a fronthaul link.

The communication manager906may support operations of the reception component902and/or the transmission component904. For example, the communication manager906may receive information associated with configuring reception of communications by the reception component902and/or transmission of communications by the transmission component904. Additionally, or alternatively, the communication manager906may generate and/or provide control information to the reception component902and/or the transmission component904to control reception and/or transmission of communications.

The reception component902may receive a first indication of a MIMO configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold. The transmission component904may transmit a second indication of a MIMO communication configuration that specifies the selection.

The communication manager906may perform the selection between the polarized MIMO configuration and the spatial MIMO configuration based at least in part on the MIMO configuration threshold.

The reception component902may receive a third indication of the performance threshold.

The reception component902may receive a third indication of an updated MIMO configuration threshold.

The communication manager906may select an updated MIMO communication configuration based at least in part on the updated MIMO configuration threshold.

Aspect 1: A method of wireless communication performed by a user equipment (UE), comprising: transmitting a first indication of a multiple-input-multiple-output (MIMO) configuration threshold that is associated with a selection between a polarization MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold; and receiving a second indication of a MIMO communication configuration that specifies the selection.

Aspect 2: The method of Aspect 1, further comprising: transmitting a third indication of the performance threshold.

Aspect 3: The method of Aspect 2, wherein the performance threshold includes at least one of: a spectral efficiency performance threshold, or a data rate performance threshold.

Aspect 4: The method of Aspect 2, wherein the performance threshold includes at least one of: a polarization MIMO performance threshold, or a spatial MIMO performance threshold.

Aspect 5: The method of any of Aspects 1-4, wherein the MIMO configuration threshold includes a frequency-dependent angular spread threshold that indicates a polarization MIMO performance based at least in part on a carrier frequency and an angular spread of the dominant clusters in the channel between the UE and a network node.

Aspect 6: The method of any of Aspects 1-5, wherein the MIMO configuration threshold includes a frequency-dependent angular spread threshold that indicates a spatial MIMO performance based at least in part on a carrier frequency and an angular spread of the dominant clusters in the channel between the UE and the network node.

Aspect 7: The method of any of Aspects 1-6, wherein transmitting the first indication of the MIMO configuration threshold comprises: transmitting the first indication of the MIMO configuration threshold in UE capability information.

Aspect 8: The method of any of Aspects 1-7, further comprising: obtaining an updated MIMO configuration threshold based at least in part on a set of reference signals; and transmitting a third indication of the updated MIMO configuration threshold.

Aspect 9: The method of any of Aspects 1-8, further comprising: calculating one or more correlation coefficients associated with M antenna elements based at least in part on one or more frequencies and one or more angular spreads, wherein M is an integer, and wherein the MIMO configuration threshold is based at least in part on the one or more correlation coefficients, wherein the MIMO configuration threshold is based at least in part on the one or more correlation coefficients.

Aspect 10: The method of Aspect 9, wherein calculating the one or more correlation coefficients comprises at least one of: calculating a first correlation coefficient for two co-polarized antenna elements of the M antenna elements; or calculating a second correlation coefficient for two cross-polarized antenna elements of the M antenna elements.

Aspect 11: The method of Aspect 9, further comprising: selecting a reference antenna element from the M antenna elements; calculating, as a first subset of the one or more correlation coefficients, a respective co-polarized correlation coefficient between the reference antenna element and each co-polarized antenna element within the M antenna elements; and calculating, as a second subset of the one or more correlation coefficients, a respective cross-polarized correlation coefficient between the reference antenna element and each cross-polarized antenna element within the M antenna elements.

Aspect 12: The method of Aspect 9, wherein the M antenna elements are included in a multiband antenna component.

Aspect 13: The method of any of Aspects 1-12, further comprising: communicating with another device based at least in part on the MIMO communication configuration.

Aspect 14: A method of wireless communication performed by a network node, comprising: receiving a first indication of a multiple-input-multiple-output (MIMO) configuration threshold that is associated with a selection between a polarized MIMO configuration and a spatial MIMO configuration, the MIMO configuration threshold being based at least in part on a performance threshold; and transmitting a second indication of a MIMO communication configuration that specifies the selection.

Aspect 15: The method of Aspect 14, further comprising: performing the selection between the polarized MIMO configuration and the spatial MIMO configuration based at least in part on the MIMO configuration threshold.

Aspect 16: The method of Aspect 15, wherein performing the selection comprises: performing the selection based at least in part on at least one of: a carrier frequency, or an angular spread.

Aspect 17: The method of any of Aspects 14-16, further comprising: receiving a third indication of the performance threshold.

Aspect 18: The method of Aspect 17, wherein the performance threshold includes at least one of: a spectral efficiency performance threshold, or a data rate performance threshold.

Aspect 19: The method of Aspect 17, wherein the performance threshold includes at least one of: a polarized MIMO performance threshold, or a spatial MIMO performance threshold.

Aspect 20: The method of any of Aspects 14-19, wherein the MIMO configuration threshold includes a frequency-dependent angular spread threshold that indicates a polarized MIMO performance based at least in part on a carrier frequency and an angular spread.

Aspect 21: The method of any of Aspects 14-20, wherein the MIMO configuration threshold includes a frequency-dependent angular spread threshold that indicates a spatial MIMO performance based at least in part on a carrier frequency and an angular spread.

Aspect 22: The method of any of Aspects 14-21, wherein receiving the first indication of the MIMO configuration threshold comprises: receiving the first indication of the MIMO configuration threshold in UE capability information.

Aspect 23: The method of Aspect 22, further comprising: receiving a third indication of an updated MIMO configuration threshold; and selecting an updated MIMO communication configuration based at least in part on the updated MIMO configuration threshold.

Aspect 24: The method of any of Aspects 14-23, wherein the MIMO configuration threshold is associated with a user equipment (UE), and the method further comprises: communicating with the UE based at least in part on the MIMO communication configuration.

Aspect 26: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors individually or collectively configured to perform the method of one or more of Aspects 1-24.

Aspect 27: An apparatus for wireless communication, comprising at least one means for performing the method of one or more of Aspects 1-24.