DIFFERENTIAL MODE FOR INTERFERENCE-SPECIFIC CHANNEL STATE INFORMATION REPORT

Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may receive, from a base station, a control message including an indication associated with a configuration for an interference measurement (IM) report in a channel state information (CSI) report. The UE may determine a setting of the configuration for the IM report based on the indication, which may include one or both of a resource setting associated with IM information in a frequency domain or a spatial setting associated with IM information in a spatial domain. The UE may generate the IM report based on one or both of the resource setting or the spatial setting and may transmit the CSI report including the IM report to the base station.

TECHNICAL FIELD

The following relates generally to wireless communications and more specifically to one or more differential modes for interference-specific channel state information (CSI) reporting.

DESCRIPTION OF THE RELATED TECHNOLOGY

A base station and a UE may communicate over a wireless channel and, to maintain reliable communications between the base station and the UE, the UE may measure a quality of the channel and a level of interference associated with the channel. The UE may transmit the measured channel quality and the measured level of interference associated with the channel to the base station in a report. In some cases, such as for relatively low-latency applications, the UE may include the measured level of interference associated with the channel in an interference measurement report included in a channel state information report. However, conventional techniques for generating and transmitting the interference measurement report may be inefficient.

SUMMARY

One innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communications at a user equipment (UE). The method may include receiving, from a base station, a control message including an indication associated with a configuration for an interference measurement (IM) report in a channel state information (C SI) report, determining a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report, and transmitting, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communications at a UE. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report, determine a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report, and transmit, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report.

Another innovative aspect of the subject matter described in this disclosure can be implemented in another apparatus for wireless communications at a UE. The apparatus may include means for receiving, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report, determining a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report, and transmitting, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communications at a UE. The code may include instructions executable by a processor to receive, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report, determine a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report, and transmit, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, the setting may include a resource setting. In such implementations, the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a quantity of subbands associated with the IM report, and generating the IM report based on the quantity of subbands and the resource setting.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, generating the IM report further may include operations, features, means, or instructions for determining first IM information associated with each subband of the quantity of subbands, averaging the first IM information associated with each subband of the quantity of subbands, and determining second IM information associated with each subband of the quantity of subbands based on the average of the first IM information associated with each subband of the quantity of subbands, where the IM report includes the second IM information associated with each subband of the quantity of subbands and the average of the first IM information associated with each subband of the quantity of subbands.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the second IM information associated with each subband of the quantity of subbands further may include operations, features, means, or instructions for determining an offset level associated with each subband of the quantity of subbands relative to the average of the first IM information associated with each subband of the quantity of subbands, and determining a differential value associated with each subband of the quantity of subbands based on the offset level and a mapping including a correspondence between one or more offset levels and one or more differential values, where the second IM information includes the differential value.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, generating the IM report further may include operations, features, means, or instructions for determining first IM information associated with a first subband of the quantity of subbands, and determining second IM information associated with each remaining subband of the quantity of subbands, where the IM report includes the first IM information associated with the first subband and the second IM information associated with each remaining subband of the quantity of subbands.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the second IM information associated with each remaining subband of the quantity of subbands further may include operations, features, means, or instructions for determining an offset level associated with the each remaining subband of the quantity of subbands relative to the first IM information associated with the first subband, and determining a differential value associated with the each remaining subband of the quantity of subbands based on the offset level and a mapping including a correspondence between one or more offset levels and one or more differential values, where the second IM information includes the differential value.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, generating the IM report further may include operations, features, means, or instructions for determining IM information associated with a frequency band including the quantity of subbands, where the IM report includes the IM information.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the IM information associated with the frequency band including the quantity of subbands further may include operations, features, means, or instructions for determining first IM information associated with each subband of the quantity of subbands, and averaging the first IM information associated with each subband of the quantity of subbands, where the IM information associated with the frequency band including the quantity of subbands includes the average of the first IM information associated with each subband of the quantity of subbands.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, the setting further includes a spatial setting. In such implementations, the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for generating the IM report based on the resource setting, the quantity of subbands, the spatial setting, and a quantity of antennas.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, generating the IM report further may include operations, features, means, or instructions for determining one or both of first complete IM information or first differential IM information associated with each subband of the quantity of subbands based on the resource setting, and determining second differential IM information associated with each antenna of the quantity of antennas based on the spatial setting, where the IM report includes one or more of the first complete IM information, the first differential IM information, or the second differential IM information.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, the setting may include a spatial setting. In such implementations, the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a quantity of antennas associated with the IM report, and generating the IM report based on the quantity of antennas and the spatial setting.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, generating the IM report further may include operations, features, means, or instructions for determining first IM information associated with each antenna of the quantity of antennas, and determining second IM information associated with each antenna of the quantity of antennas based on a ratio between the first IM information associated with each antenna of the quantity of antennas and the first IM information associated with a first antenna of the quantity of antennas, where the IM report includes the first IM information associated with the first antenna and the second IM information associated with each antenna of the quantity of antennas.

Some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, a downlink control message that includes triggering information associated with the setting of the configuration, activating the setting of the configuration for the IM report based on the triggering information, where the setting includes one or both of a differential resource setting or a differential spatial setting, where, and generating the IM report may be based on receiving the downlink control message and one or both of the differential resource setting or the differential spatial setting.

Some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a downlink channel property satisfies a threshold, and determining to change the setting to one or both of a differential resource setting or a differential spatial setting based on determining that the downlink channel property satisfies the threshold, where the CSI report includes a field indicating a request to change the setting to one or both of the differential resource setting or the differential spatial setting.

One innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communications at a base station. The method may include determining a setting of a configuration for generating an IM report at a UE, transmitting, to the UE, a control message including an indication associated with the configuration for generating the IM report in a CSI report, and receiving, from the UE, the CSI report including the IM report based on the setting and transmitting the control message including the indication.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communications at a base station. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to determine a setting of a configuration for generating an IM report at a UE, transmit, to the UE, a control message including an indication associated with the configuration for generating the IM report in a CSI report, and receive, from the UE, the CSI report including the IM report based on the setting and transmitting the control message including the indication.

Another innovative aspect of the subject matter described in this disclosure can be implemented in another apparatus for wireless communications at a base station. The apparatus may include means for determining a setting of a configuration for generating an IM report at a UE, transmitting, to the UE, a control message including an indication associated with the configuration for generating the IM report in a CSI report, and receiving, from the UE, the CSI report including the IM report based on the setting and transmitting the control message including the indication.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communications at a base station. The code may include instructions executable by a processor to determine a setting of a configuration for generating an IM report at a UE, transmit, to the UE, a control message including an indication associated with the configuration for generating the IM report in a CSI report, and receive, from the UE, the CSI report including the IM report based on the setting and transmitting the control message including the indication.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, the setting may include a resource setting. In such implementations, the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a quantity of subbands associated with the IM report, and receiving the CSI report including the IM report based on the quantity of subbands and the resource setting.

Some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, in the IM report, second IM information associated with each subband of the quantity of subbands and an average of first IM information associated with each subband of the quantity of subbands, and determining the first IM information associated with each subband of the quantity of subbands based on the second IM information and the average of the first IM information associated with each subband of the quantity of subbands.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the first IM information associated with each subband of the quantity of subbands further may include operations, features, means, or instructions for determining a differential value associated with each subband of the quantity of subbands, where the second IM information includes the differential value, determining an offset level associated with each subband of the quantity of subbands relative to the average of the first IM information associated with each subband of the quantity of subbands based on the differential value and a mapping including a correspondence between one or more offset levels and one or more differential values, and determining the first IM information associated with each subband of the quantity of subbands based on the offset level and the average of the first IM information associated with each subband of the quantity of subbands.

Some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, in the IM report, first IM information associated with a first subband of the quantity of subbands and second IM information associated with each remaining subband of the quantity of subbands, and determining the first IM information associated with each remaining subband of the quantity of subbands based on the second IM information and the first IM information associated with the first subband.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the first IM information associated with each remaining subband of the quantity of subbands further may include operations, features, means, or instructions for determining a differential value associated with each remaining subband of the quantity of subbands, where the second IM information includes the differential value, determining an offset level associated with each remaining subband of the quantity of subbands relative to the first IM information associated with the first subband based on the differential value and a mapping including a correspondence between one or more offset levels and one or more differential values, and determining the first IM information associated with each remaining subband of the quantity of subbands based on the offset level and the first IM information associated with the first subband.

Some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, in the IM report, IM information associated with a frequency band including the quantity of subbands.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, the setting further includes a spatial setting. In such implementations, the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving the IM report based on the resource setting, the quantity of subbands, the spatial setting, and a quantity of antennas.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the IM report further may include operations, features, means, or instructions for receiving one or both of first complete IM information or first differential IM information associated with each subband of the quantity of subbands based on the resource setting, and receiving second differential IM information associated with each antenna of the quantity of antennas based on the spatial setting, where the IM report includes one or more of the first complete IM information, the first differential IM information, or the second differential IM information.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, the setting may include a spatial setting. In such implementations, the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a quantity of antennas associated with the IM report, and receiving the CSI report including the IM report based on the quantity of antennas and the spatial setting.

In some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the IM report further may include operations, features, means, or instructions for receiving second IM information associated with each antenna of the quantity of antennas, where the second IM information includes a ratio between first IM information associated with each antenna of the quantity of antennas and the first IM information associated with a first antenna of the quantity of antennas, and receiving the first IM information associated with the first antenna.

Some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, a downlink control message that includes triggering information associated with the setting of the configuration, where the setting includes one or both of a differential resource setting or a differential spatial setting.

Some implementations of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the UE, the CSI report including a field indicating a request to change the setting to one or both of a differential resource setting or a differential spatial setting, where determining the setting of the configuration for generating the IM report may be based on receiving the CSI report including the field.

DETAILED DESCRIPTION

Various implementations generally relate to determining a setting of a configuration for an interference measurement (IM) report and generating, at a user equipment (UE), the IM report based on the setting of the configuration. Some implementations may more specifically relate to determining that the setting includes a resource setting, or a spatial setting, or both, and generating the IM report based on the resource setting, or the spatial setting, or both. In some examples in which the setting includes the resource setting, the UE may determine IM information associated with one or more subbands (for example, each subband) of a quantity of subbands that the base station and the UE use for communications based on the resource setting. The resource setting may include a wideband IM setting, a differential subband IM setting (which may be referred to as a differential resource setting), or an absolute subband IM setting (which may alternatively be referred to herein as a complete subband IM setting in examples in which absolute and complete may be used synonymously). In some additional or alternative implementations, the setting may include the spatial setting. In such implementations, the UE may determine IM information associated with one or more antennas (for example, each antenna) of a quantity of antennas that the UE may use to receive downlink communications from the base station based on the spatial setting. In some examples, the spatial setting may include a differential spatial setting.

Particular implementations of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages, among others. In some implementations, the described techniques can be used to reduce the overhead of an IM report while maintaining reliable IM reporting in various conditions, such as for applications requiring relatively low-latency. For example, the base station may determine the setting of the configuration for the IM report based on a channel property associated with the channel used by the base station and the UE such that the UE may better generate the IM report based on the property of the channel. For instance, the channel may be associated with a relatively low frequency variant property and, as such, the interference across each subband of the quantity of subbands of the channel may be similar. The base station may determine or configure the setting to include a differential resource setting or a differential spatial setting, or both, and the UE may generate the IM report by conveying IM information associated with at least some of the quantity of subbands, or the quantity of antennas, or both, as differential values relative to a baseline value rather than as absolute values (for example, complete values that are full values rather than differential values that may be relative to one or more absolute values or complete values). As such, the UE may avoid conveying the IM information for each subband and each antenna as an absolute value (for example, a complete value), which may reduce the amount of uplink resources the UE uses to transmit the IM report. Further, in some implementations of the described techniques, the base station may dynamically activate or deactivate the differential resource setting or the differential spatial setting, or both, which may enhance the level of flexibility and responsiveness that the base station has in adapting the configuration for the IM report based on the channel property (for example, the frequency variant property).

The base stations105may communicate with the core network130, or with one another, or both. For example, the base stations105may interface with the core network130through one or more backhaul links120(for example, via an S1, N2, N3, or other interface). The base stations105may communicate with one another over the backhaul links120(for example, via an X2, Xn, or other interface) either directly (for example, directly between base stations105), or indirectly (for example, via core network130), or both. In some examples, the backhaul links120may be or include one or more wireless links.

The communication links125shown in the wireless communications system100may include uplink transmissions from a UE115to a base station105, or downlink transmissions from a base station105to a UE115. Carriers may carry downlink or uplink communications (for example, in an FDD mode) or may be configured to carry downlink and uplink communications (for example, in a TDD mode).

A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (for example, in the time domain) of the wireless communications system100and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (for example, the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communications system100may be dynamically selected (for example, in bursts of shortened TTIs (sTTIs)).

Each base station105may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a base station105(for example, over a carrier) and may be associated with an identifier for distinguishing neighboring cells (for example, a physical cell identifier (PCID), a virtual cell identifier (VCID), or others). In some examples, a cell may also refer to a geographic coverage area110or a portion of a geographic coverage area110(for example, a sector) over which the logical communication entity operates. Such cells may range from smaller areas (for example, a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas110, among other examples.

In some examples, transmissions by a device (for example, by a base station105or a UE115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (for example, from a base station105to a UE115). The UE115may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more subbands. The base station105may transmit a reference signal (for example, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which may be precoded or unprecoded. The UE115may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (for example, a multi-panel type codebook, a linear combination type codebook, a port selection type codebook). Although these techniques are described with reference to signals transmitted in one or more directions by a base station105, a UE115may employ similar techniques for transmitting signals multiple times in different directions (for example, for determining a beam direction for subsequent transmission or reception by the UE115) or for transmitting a signal in a single direction (for example, for transmitting data to a receiving device).

A receiving device (for example, a UE115) may try multiple receive configurations (for example, directional listening) when receiving various signals from the base station105, such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (for example, different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions. In some examples, a receiving device may use a single receive configuration to receive along a single beam direction (for example, when receiving a data signal). The single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (for example, a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

As described above, the base station105and the UE115may communicate over a wireless channel and, to maintain reliable communications, the UE115may measure a quality of the channel and an interference associated with the channel, and may transmit the measured quality and interference, as well as any other channel state information (CSI) feedback, to the base station105, for example, in a CSI report. The base station105may use the measured quality and interference in the CSI report to adjust or otherwise modify one or more transmission parameters or configurations that the base station105or the UE115, or both, may use to communicate. In some systems, the UE115may provide interference feedback (for example, the measured interference associated with the channel) to the base station105according to a relatively low-latency timeline. As such, the UE115may transmit the interference feedback in an IM report in the CSI report to meet or satisfy the relatively low-latency timeline. Using conventional techniques, however, the UE115may generate the IM report using an inefficient amount of uplink resources due in part to a lack of flexibility associated with a configuration for the IM report.

In contrast, in some aspects of the present disclosure, the base station105may determine a setting of the configuration for generating the IM report and may transmit, to the UE115, a control message including an indication associated with the configuration. Likewise, the UE may receive the control message including the indication and determine, based on the indication, the setting of the configuration. In some aspects, the indication may include a field, such as an im-FormatIndicator field, and the configuration may include one or more higher layer parameters, such as a CSI-ReportConfig parameter. The setting may include a resource setting, or a spatial setting, or both. In some examples in which the setting is or includes a resource setting, the setting may itself include various settings, for example, a widebandIM setting, a subbandIM_absolute setting, or a subbandIM_differential setting. In other words, the indication (for example, that may be included in the im-FormatIndicator field) may be information in a field in the configuration (for example, the CSI-ReportConfig parameter) that the base station105may set to one of multiple settings, such as the widebandIM setting, the subbandIM_absolute setting, or the subbandIM_differential setting.

The UE115may generate the IM report based on the setting (which again, may itself include multiple settings) that the indication includes or indicates. In some examples, the setting may be the subbandIM_differential setting, or a differential spatial IM setting, or both, and the UE115may generate the IM report including differential values relative to a baseline value for at least a subset of a quantity of subbands of the channel, or at least a subset of a quantity of antennas that the UE115may use to receive communications from the base station105, or both. As such, the UE115may transmit the IM report using fewer uplink resources than the UE115may otherwise use if the UE115generates the IM report including absolute values (for example, complete values) for each subband and each antenna.

FIG.2illustrates an example of a wireless communications system200that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. In some examples, the wireless communications system200may implement aspects of the wireless communications system100. The wireless communications system200may include a base station105-aand a UE115-a,which may be examples of the corresponding wireless devices as described with reference toFIG.1. The base station105-amay provide network coverage for a coverage area110-a.In some examples, the wireless communications system200may be configured to support IM reporting in a CSI report225.

For example, a base station105-aand a UE115-amay support beamforming techniques and may communicate over a communications link205using one or more directional beams. In some examples, the quality and reliability of a directional beam used by the base station105-aand the UE115-amay change over time. For example, the UE115-amay move (for example, change physical location) or an obstacle may move or be moved such that it is located between the base station105-aand the UE115-a,which may reduce the quality and reliability of the beam. To maintain a reliable beam for communications between the base station105-aand the UE115-a,the base station105-aand the UE115-amay perform a beam management procedure. In performing a beam management procedure, the base station105-amay transmit one or more reference signals, such as CSI reference signals (CSI-RSs), over one or more beams and the UE115-amay measure the reference signals to determine a quality associated with at least some, if not each, of the one or more beams. In some examples, such CSI-RSs may be non-zero power (NZP) CSI-RSs. In some examples, the measurement of the one or more CSI-RSs (or NZP CSI-RSs) may include or otherwise refer to a channel measurement, or an IM, or both.

The UE115-amay generate a CSI report225including channel measurement information, or IM information, or both, based on the measurements to provide channel feedback, or interference feedback, or both, to the base station105-a.In some examples, the UE115-amay provide the IM feedback, which may also be referred to herein as IM information, to the base station105-a,for example, implicitly via a channel quality indicator (CQI) field in the CSI report225. For example, the UE115-amay implicitly convey the IM information to the base station105-avia the CQI field in the CSI report225. In other words, the UE115-amay implicitly convey the IM information to the base station105-abased on what information is included in the CQI field or the format of the CQI field, or both. In some aspects, such implicit indication of the IM information via the CQI field in the CSI report225may be referred to as a coupling of the IM information with the CQI field. In such examples, the base station105-amay indicate, via a CSI reporting setting (such as in a CSI-ReportConfig parameter), a resource setting for conveying the channel measurement information in the CSI report225and one or more resource settings for conveying the IM information in the CSI report225(for example, the implicitly reported IM information in the CSI report225).

For instance, in some examples, the CSI resource setting may include one or more resource settings for providing channel measurement information associated with one or more NZP CSI-RSs in the CSI report225and may not include a resource setting for providing IM information in the CSI report225. In some other examples, the CSI resource setting may include one or more resource settings for providing channel measurement information associated with one or more NZP CSI-RSs in the CSI report225and one or more resource settings for providing IM information associated with a CSI-IM (a set of resource elements reserved for IM) or one or more NZP CSI-RSs in the CSI report225. In some other examples, the CSI resource setting may include one or more resource settings for providing channel measurement information associated with one or more NZP CSI-RSs in the CSI report225, one or more resource settings for providing IM information associated with a CSI-IM in the CSI report225, and one or more resource settings for providing IM information associated with one or more NZP CSI-RSs in the CSI report225.

Such implicit IM reporting via the CQI field in the CSI report225may satisfy transmission timelines associated with applications that do not require relatively low-latency (for example, relaxed transmission timelines associated with some CSI reporting types). For example, for a CSI reporting type associated with subband-wise CSI feedback, in which the CSI report225may include channel measurement information or IM information, or both, associated with each subband210of a quantity of subbands210of a channel used by the base station105-aand the UE115-a,the UE115-amay generate and transmit the CSI report225according to relaxed transmission timelines. In some examples, the latency requirement or transmission timeline associated with each CSI reporting type may be based on criteria associated with the CSI reporting type and may be pre-configured at the UE115-aor defined by a specification.

In some systems associated with variable or bursty traffic patterns, such as some edge computing systems (for example, 5G extended reality (XR) systems), however, the base station105-amay attempt to handle downlink transmissions (for example, adjust or modify one or more transmission parameters) more aggressively and, as such, the UE115-amay transmit IM information to the base station105-aaccording to stricter transmission timelines (transmission timelines associated with applications that require relatively low-latency). In such systems, the UE115-amay transmit the IM information in an IM report-only CSI report225to satisfy the relatively low-latency requirements or meet the stricter transmission timelines. In other words, the UE115-amay transmit a CSI report225to the base station105-aincluding only IM information or including IM information and a reduced amount of channel feedback relative to a full CSI report225. Such IM report-only CSI reports225may be associated with reduced computation complexity relative to the full CSI report225and may achieve relatively lower latency CSI feedback than full CSI reports225. In some examples, such an IM report-only CSI report225may be referred to as an interference-specific CSI report225.

A CSI reporting setting for an IM report-only CSI report225may include one or more resource settings for providing IM information in the IM report-only CSI report225. For instance, in some examples, the CSI reporting setting may include one or more resource settings for providing IM information associated with a CSI-IM or one or more NZP CSI-RSs in the CSI report225. In some other cases, the CSI resource setting may include one or more resource settings for providing IM information associated with a CSI-IM in the CSI report225and one or more resource settings for providing IM information associated with one or more NZP CSI-RSs in the CSI report225.

In some examples, the IM report included in the IM report-only CSI report225may include IM information associated with each subband210of the quantity of subbands210of the channel used by the base station105-aand the UE115-a.For example, the base station105-aand the UE115-amay communicate using a channel including a quantity of subbands210and the UE115-amay include IM information associated with each subband210in the IM report. In other words, the IM report may feature subband-level granularity. In some examples, for each subband, the UE115-amay also include IM information associated with each antenna215that the UE115-amay use to receive downlink communications from the base station105-a(for example, each reception (Rx) antenna215of the UE115-a). In some examples, the IM information for each subband210may be constructed as a diagonal matrix structure in which each diagonal entry of the matrix corresponds to IM information (IM feedback) associated with a respective antenna215. As such, the diagonal matrix may be a square matrix with a size based on (such as, equal to) the number of antennas215at the UE115-a.For example, a diagonal matrix Rnnfor a subband210may be defined according to Equation (1) below. Rnnmay be defined as a matrix of size n×n where n=2, 4, 6, 8, among other examples, based on the number of antennas215at the UE115-a,where each diagonal entry r11, . . . , rnncorresponds to IM information associated with an antenna215.

The UE115-amay use Equation (1) to determine the IM information for each subband and may generate the IM report including the IM information for each subband. In some examples, however, an IM report including absolute IM information for each of the quantity of subbands210across the quantity of antennas215may inefficiently use uplink resources. For example, the UE115-amay generate the IM report including absolute IM information for each of the quantity of subbands210across the quantity of antennas215using a relatively large number of bits and may use a relatively large amount of uplink resources to transmit the CSI report225including the IM report. Further, in some examples, the channel used by the base station105-aand the UE115-afor communications may be associated with a relatively low frequency variant property such that the difference in IM information associated with each subband210may be relatively small. In other words, the interference gap across the different subbands210may be small. As such, generating the IM report including absolute IM information may result in unnecessary overhead because the UE115-amay more efficiently generate the IM report including differential IM information associated with each subband210or each antenna,215, or both, relative to a baseline, which may use a smaller number of bits and fewer uplink resources than absolute IM information when the channel is associated with the relatively low frequency variant property.

In some implementations of the present disclosure, the base station105-aand the UE115-amay support a setting of a configuration for generating the IM report and the UE115-amay transmit the CSI report225including the IM report more efficiently based on the setting. For example, the setting may account for the frequency variance of the channel and the UE115-amay, based on the setting, transmit the CSI report225including the IM report using an appropriate amount of uplink resources based on the frequency variance of the channel.

In some examples, the base station105-amay transmit a control message220including an indication (an indication including a setting, such as a resource setting or a spatial setting, or both) associated with the configuration to the UE115-a.In some aspects, the control message220may include or otherwise refer to control signaling, such as RRC signaling, among other examples. In some examples, the indication may be information included an im-FormatIndicator field and may be associated with a CSI-ReportConfig parameter (for example, the configuration) for the IM report. For example, the base station105-amay configure a CSI report225based on configuring the parameters of the CSI-ReportConfig parameter, the configured parameters including one or more of a reportConfigType, a reportQuantity, a reportFreqConfiguration, a timeRestrictionForChanneIMeasurement, a timeRestrictionForInterferenceMeasurement, or a codebookConfig. In some implementations of the present disclosure, the base station105-amay include the indication (for examples, related to the im-FormatIndicator field) in the reportFreqConfiguration parameter of the CSI-ReportConfig parameter. For example, the base station105-amay include the information in the im-FormatIndicator field along with the cqi-FormatIndicator field and the pmi-FormatIndicator field in the reportFreqConfiguration parameter.

In some examples, the UE115-amay determine the setting of the configuration based on a setting of the indication. For example, the UE115-amay determine the setting of the configuration based on determining which setting the im-FormatIndicator field is set to for the UE. In some aspects, the indication may be set to one of a wideband IM setting, an absolute subband IM setting (for example, a complete subband IM setting), or a differential subband IM setting. In some specific implementations, such a wideband IM setting, an absolute subband IM setting (for example, a complete subband IM setting), or a differential subband IM setting may be referred to as a widebandIM setting, a subbandIM_absolute setting, or a subbandIM_differential setting, respectively. As such, the reportFreqConfiguration parameter may include the cqi-FormatIndicator field, which may return a widebandCQI setting or a subbandCQI setting, the pmi-FormatIndicator field, which may return a widebandPMI setting or a subbandPMI setting, and the im-FormatIndicator field, which may return a widebandIM setting, a subbandIM_absolute setting, or a subbandIM_differential setting. In some examples, the reportFreqConfiguration parameter may additionally include one or more other parameters or other information.

In some examples in which the indication is set to the wideband IM setting, the UE115-amay generate the IM report using wideband IM information. In other words, the UE115-amay generate the IM report using a wideband-level of granularity. For example, the UE115-amay measure the interference associated with a frequency band (the wideband) including the quantity of subbands210and may include the IM information associated with the frequency band in the IM report. In some specific implementations, the UE115-amay determine the IM information associated with the frequency band based on measuring the interference associated with each subband210of the quantity of subbands210and averaging the measured interference across the quantity of subbands210. The UE115-amay transmit the IM report including the IM information associated with the frequency band coupled with a CQI field in the CSI report225. For example, the UE115-amay apply the wideband IM report to the CQI field in the CSI report225to implicitly convey the IM information associated with the frequency band to the base station105-avia the CQI field. In other words, the UE115-amay couple the wideband IM report with the CQI field based on the information that the UE115-aincludes in the CQI field or the format of the CQI field, or both. As such, the base station105-amay determine the IM information associated with the frequency band based on the information included in the CQI field or the format of the CQI field, or both. In some implementations, the base station105-amay determine to use the wideband IM setting to reduce the amount of uplink resources used by the CSI report225including the IM report or to reduce the computation complexity at the UE115-a(by reducing the level of granularity that the UE115-amay generate the IM report with).

In some examples in which the indication is set to the absolute subband IM setting, the UE115-amay generate the IM report using absolute subband IM information (for example, full or complete IM information). In other words, the UE115-amay generate the IM report using the absolute IM information at a subband-level of granularity. For example, the UE115-amay measure the interference associated with each subband210of the quantity of subbands210and may include the absolute IM information (for example, absolute interference feedback) associated with each subband210in the IM report. Additional details relating to generating the IM report based on the absolute subband IM setting are described herein, for example, with reference toFIG.3.

In some examples in which the indication is set to the differential subband IM setting, the UE115-amay generate the IM report using differential subband IM information (for example, IM information that is relative to, such as an offset from, full or complete IM information). In other words, the UE115-amay generate the IM report using differential IM information for at least a subset of the subbands210at a subband-level of granularity. For example, the UE115-amay measure the interference associated with each subband210of the quantity of subbands210and may determine some baseline IM information (for example, baseline absolute IM information) based on the measured interference associated with one or more of the quantity of subbands210. For example, the UE115-amay determine the baseline IM information based on an average of the determined IM information associated with each subband210of the quantity of subbands210or based on absolute IM information associated with a first subband210, among other examples. In such examples, the UE115-amay generate the IM report including differential values associated with at least a subset of the subbands210relative to the baseline IM information. Additional details relating to generating the IM report based on the differential subband IM setting are described herein, for example, with reference toFIG.3.

The wideband IM setting, the absolute subband IM setting (for example, the complete subband IM setting), and the differential subband IM setting may be examples of a resource setting of the configuration for the IM report. In some additional or alternative implementations, the setting may include a spatial setting. In such implementations, the spatial setting may be provided in the im-FormatIndicator field in the reportFreqConfiguration parameter or in a different field or parameter of the configuration for the IM report (for example, the CSI-ReportConfig parameter). In examples in which the spatial setting is provided in a different field or parameter (for example, a different higher layer configuration), the indication may refer to any field or parameter that may include such a spatial setting or the resource setting, or both, or may refer to multiple fields or parameters (such as if a first field or parameter includes the resource setting and a second field or parameter includes the spatial setting).

The spatial setting may include an absolute spatial IM setting or a differential spatial IM setting (for example, an absolute IM reporting setting or a differential IM reporting setting in the spatial domain) such that the base station105-amay control how the UE115-atransmits IM information associated with each antenna215of the quantity of antennas215in the IM report. In some examples, the base station105-amay determine to configure the spatial setting to the absolute spatial IM reporting setting and the UE115-amay generate the IM report including absolute IM information associated with each antenna215of the quantity of antennas215. In some other examples, the base station105-amay determine to configure the spatial setting to the differential spatial IM reporting setting and the UE115-amay generate the IM report including differential IM information associated with at least a subset of the quantity of antennas215. In such examples, the differential IM information may use fewer bits than the absolute IM information and, as such, the UE115-amay reduce the overhead associated with the CSI report225including the IM report.

In some examples in which the spatial setting is the differential IM reporting setting, the UE115-amay report differential IM information associated with each antenna215of the quantity of antennas215relative to a reference or baseline antenna215. In some aspects, the UE115-amay determine the baseline antenna215based on determining which antenna215is associated with the lowest interference. The absolute IM information (the interference level) associated with the baseline antenna215may be referred to as IM_level_Rx1. In some implementations, the UE115-amay determine differential IM information associated with each antenna215relative to the absolute IM information associated with the baseline antenna215based on determining a ratio between the absolute IM information associated with each antenna215and the absolute IM information associated with the baseline antenna215. In other words, the UE115-amay determine the absolute IM information associated with each antenna215, determine which antenna215is the baseline antenna215, and determine a ratio between the absolute IM information associated with each antenna215and the absolute IM information associated with the baseline antenna215. In some aspects, the ratio (the differential IM information) associated with each antenna215may be referred to as delta_IM_level. The ratio associated with an ithantenna215may be defined mathematically as rii/r11, where riicorresponds to an entry in the Rnnmatrix corresponding to the absolute IM information associated with the ithantenna215and r11corresponds to the absolute IM information associated with the baseline antenna215(in this example, the antenna215corresponding to the first entry in the Rnnmatrix).

In some implementations, the UE115-amay convey the ratio in the IM report based on a quantity of bits (for example, a single fixed quantity of bits) and a range of IM ratios. For example, the UE115-amay determine a range of IM ratios and may determine a level of granularity of the range of IM ratios (for example, a number of values in the range of IM ratios) based on the quantity of bits. The UE115-amay convey the ratio in the IM report based on the level of granularity of the range. For instance, the range of IM ratios may include the range, in decibels (dBs), between −5 dB and −20 dB and the UE115-amay use Y bits to convey the ratio associated with each antenna215. As such, the UE115-amay determine 2Yvalues between −5 dB and −20 dB and may map the determined ratio (the differential IM information) associated with each antenna215to one of the 2Yvalues between −5 dB and −20 dB. In other words, the UE115-amay perform uniform quantization across the number of antennas215at the UE115-abased on determining a ratio associated with each antenna215based on a single quantity of Y bits.

In some examples, the UE115-amay map the determined ratio to the closest of the 2Yvalues or may use some other function, algorithm, or procedure to map the determined ratio to one of the 2Yvalues. The IM report may include the absolute IM information associated with the baseline antenna215(the IM_level_Rx1) and differential IM information (the ratios or the delta_IM_level) for each remaining antenna215of the quantity of antennas215. As such, the differential IM information may use Y*(N_Rx−1) bits to indicate the differential IM information, where N_Rx corresponds to the quantity of antennas215(Rx antennas) at the UE115-a.In some aspects, the UE115-amay receive an indication of the Y bits from the base station105-avia RRC signaling.

In some other implementations, the UE115-amay convey the ratio in the IM report based on multiple quantities of bits and the range of IM ratios. For example, the base station105-amay signal a different quantity of bits for each antenna215and the UE115-amay use a different quantity of bits to report the differential IM information (for example, the ratios) associated with each antenna215. In other words, the UE115-amay perform non-uniform quantization across the number of antennas215at the UE115-abased on using a different number of bits to determine the ratios associated with each antenna215. For instance, the base station105-amay configure Y_i bits for the ithantenna215and the UE115-amay use 2Y_ivalues of the range of IM ratios (for example, 2Y_ivalues between −5 dB and −20 dB) to report the ratio In some aspects, the UE115-amay receive an indication (or multiple indications) of the multiple quantities of bits from the base station105-avia RRC signaling.

As such, the UE115-amay include the absolute IM information associated with the baseline antenna215and the differential IM information associated with each remaining antenna215(for example, based on uniform or non-uniform quantization using one or more quantities of configured bits) in the IM report based on the differential spatial IM setting. In some examples, the setting of the configuration for the IM report may include both of a differential subband IM setting and a differential spatial IM setting and the UE115-amay generate the IM report including differential IM information for at least a subset of the quantity of subbands210as well as differential IM information for at least a subset of the quantity of antennas215, which may further reduce the overhead associated with the IM report relative to using the differential subband IM setting or the differential spatial IM setting alone.

In some examples, the base station105-amay trigger or otherwise activate the setting of the configuration (which may be a setting of the UE) to the differential IM setting (a differential resource setting or a differential spatial setting, or both) for differential IM reporting based on transmitting the control message220(for example, based on the higher layer configuration). In some other examples, the base station105-amay dynamically trigger or activate the setting of the configuration to the differential IM setting via triggering information in a downlink control message, such as via downlink control information (DCI).

For example, the base station105-amay determine to use the differential subband IM setting of the configuration for the IM report based on determining that the channel used by the base station105-aand the UE115-ahas a relatively low frequency variant property or a relatively flat fading property and that the IM information associated with each subband210may vary less than a threshold amount. For example, the base station105-amay determine that a range of the IM information associated with each subband210is less than a threshold range or that the difference between the IM information associated with two subbands210is less than a threshold difference and may determine that the differential subband IM setting may result in a more efficient use of uplink resources (reduce the size of the IM report) or reduce the computational complexity at the UE115-arelative to the computational complexity associated with generating an IM report including absolute IM information.

Additionally or alternatively, the base station105-amay determine to use a differential spatial IM setting of the UE based on determining that the interference levels across the number of antennas215reported by the UE115-a(in a previous IM report, for example) are relatively stable. For example, the base station105-amay determine that the IM information associated with each antenna215varies less than a threshold amount and may trigger or activate the differential spatial setting based on determining that the IM information associated with each antenna215varies less than the threshold amount. For example, the base station105-amay determine that a range of the IM information associated with each antenna215is less than a threshold range or that the difference between the IM information associated with two antennas215is less than a threshold difference and may determine that the differential spatial setting may result in a more efficient use of uplink resources (reduce the size of the IM report) or reduce the computational complexity at the UE115-arelative to the computational complexity associated with generating an IM report including absolute IM information.

In some specific implementations, the base station105-amay determine to use the differential IM setting (in either the frequency domain or the spatial domain, or both) based on receiving an indication from the UE115-a.For example, the UE115-amay determine that the IM information associated with each subband210or each antenna215, or both, varies less than the threshold amount and may transmit an indication in a field, such as a Trig_diff field, in a CSI report225(a previous CSI report225) to request the base station105-ato configure the setting to the differential IM setting. In some examples, the UE115-amay determine that the IM information associated with each subband210or each antenna215, or both, varies less than the threshold amount based on, for example, referencing a previous IM report, or based on referencing current IM information associated with each subband210of the quantity of subbands210, or each antenna215of the quantity of antennas215, or both.

In some examples, the base station105-amay deactivate the setting from the differential IM setting (in the frequency domain or the spatial domain, or both) to an absolute IM setting for absolute IM reporting based on transmitting the control message220(for example, based on the higher layer configuration). In some other examples, the base station105-amay dynamically deactivate the setting to the absolute IM setting (in either the frequency domain or the spatial domain, or both) via a downlink control message, such as via DCI.

For example, the base station105-amay determine to use the absolute subband IM setting (for example, a complete subband IM setting) of the configuration for the IM report based on determining that the channel used by the base station105-aand the UE115-ahas a high frequency variant property or a relatively steep fading property and that the IM information associated with each subband210may vary greater than a threshold amount. For example, the base station105-amay determine that a range of the IM information associated with each subband210is greater than a threshold range or that the difference between the IM information associated with two subbands210is greater than a threshold difference and may determine that the absolute subband IM setting may result in a more efficient use of uplink resources (reduce the size of the IM report) or reduce the computational complexity at the UE115-arelative to the computational complexity associated with generating an IM report including differential IM information.

Additionally or alternatively, the base station105-amay determine to use the absolute spatial IM setting based on determining that the interference levels (the IM information) across the number of antennas215reported by the UE115-a(reported in a previous IM report, for example) are relatively unstable or variable. For example, the base station105-amay determine that the IM information associated with each antenna215varies greater than a threshold amount and may deactivate the differential spatial IM setting (and activate the absolute spatial IM setting) based on determining that the IM information associated with each antenna215varies greater than the threshold amount. For example, the base station105-amay determine that a range of the IM information associated with each antenna215is greater than a threshold range or that the difference between the IM information associated with two antennas215is greater than a threshold difference and may determine that the absolute spatial IM setting may result in a more efficient use of uplink resources (reduce the size of the IM report) or reduce the computational complexity at the UE115-arelative to the computational complexity associated with generating an IM report including differential IM information.

In some specific implementations, the base station105-amay determine to use the absolute IM setting (in either the frequency domain or the spatial domain, or both) based on receiving an indication from the UE115-a.For example, the UE115-amay determine that the IM information associated with each subband210or each antenna215, or both, varies greater than the threshold amount and may transmit an indication in a field, such as a Trig_diff field, in a CSI report225(a previous CSI report225) to request the base station105-ato configure the setting to the absolute IM setting. In some examples, the UE115-amay determine that the IM information associated with each subband210or each antenna215, or both, varies greater than the threshold amount based on referencing a previous IM report or based on referencing current IM information associated with each subband210of the quantity of subbands210or each antenna215of the quantity of antennas215, or both.

As such, the UE115-amay determine the setting of the configuration for the IM report and generate the IM report based on the setting, which may provide more flexibility to account for the variance in interference levels across the quantity of subbands210or the quantity of antennas215, or both. Accordingly, the UE115-amay generate the IM report using a more optimal amount of uplink resources, which may reduce system overhead and increase the spectral efficiency of the system. Moreover, the base station105-amay dynamically activate or deactivate the differential IM setting via the downlink control message, which may further increase the flexibility and control that the base station105-ahas in determining the configuration for generating the IM report at the UE115-a.

FIG.3illustrates example IM reporting configurations300,301, and302that support one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. In some examples, the IM reporting configurations300,301, and302may be implemented by one or more aspects of a wireless communications system100or a wireless communications system200. The IM reporting configurations300,301, and302illustrate examples of the present disclosure in which the setting includes a resource setting. For example, the IM reporting configuration300may be a visualization of an IM report associated with a configuration including an absolute subband IM setting (for example, a complete subband IM setting), and the IM reporting configuration301and the IM reporting configuration302may be visualizations of alternatives for an IM report associated with a configuration including a differential subband IM setting.

As described with reference toFIG.2, the setting may include a resource setting and a UE115may generate an IM report for a base station105based on the resource setting and a quantity of subbands of a channel used by the base station105and the UE115. The IM report may include IM information (either absolute or differential) associated with each subband of the quantity of subbands in the frequency domain across a quantity of antennas (Rx antennas) at the UE115in the spatial domain. Although IM reporting configurations300,301, and302may illustrate four subbands (including a subband305, a subband310, a subband315, and a subband320) and two antennas as various examples, any quantity of subbands and any quantity of antennas may be applicable without exceeding the scope of the present disclosure.

In IM reporting configuration300, the base station105may set the indication (for example, information in the im-FormatIndicator field) to an absolute subband IM setting, such as a subbandIM_absolute setting, and the UE115may generate the IM report accordingly. In some examples, the UE115-amay determine the absolute IM information associated with each of a subband305-a,a subband310-a,a subband315-a,and a subband320-aand determine a bit line (a number of bits) corresponding to the absolute IM information associated with each antenna of each subband to include in the IM report. In some aspects, the quantity of bits of a bit line corresponding to absolute IM information may be referred to as N1 bits and, as such, the IM report may include a quantity of bits equal to N_sub*N_Rx*N1, where N_sub corresponds to the quantity of subbands of the channel used by the base station105and the UE115and N_Rx corresponds to the quantity of antennas at the UE115. As described above, the base station105-amay set the indication to the absolute subband IM setting in examples in which the channel used by the base station105and the UE115is associated with a high frequency variant property or a steep fading property.

In IM reporting configuration301, the base station105may set the indication (for example, information in the im-FormatIndicator field) to a differential subband IM setting, such as a subbandIM_differential setting, and the UE115may generate the IM report accordingly. In some examples, the UE115-amay determine the absolute IM information associated with each of a subband305-b,a subband310-b,a subband315-b,and a subband320-band determine a bit line (for example, a number of bits) corresponding to the absolute IM information associated with each antenna of each subband. In some implementations, the UE115may determine to select or reference a subband, such as subband320-b,as a baseline subband from which to determine differential IM information. The UE115may determine to reference the subband320-bbased on a configuration, signaling from the base station105, an interference level, or any other procedure, or selection rule, or algorithm that may be used for selecting a subband from a set of subbands. In such implementations, the UE115may determine an offset level associated with each remaining subband, such as the subband305-b,the subband310-b,and the subband315-brelative to the absolute IM information associated with the subband320-b.Based on determining the offset level, the UE115may determine a differential value (for example, differential IM information) based on the offset level and may determine a mapping between a set of differential values and a set of offset levels.

In some examples, the mapping may be defined at the UE115, for example, in or via higher layer configurations, such as those signaled to the UE115from the base station105via RRC signaling. Additionally or alternatively, the base station105may transmit an indication of the mapping (or an indication of an adjustment or an update for the mapping) to the UE115in a downlink control message, such as DCI. Additionally or alternatively, the mapping may be pre-configured at the UE115(based on a definition in a product or industry standard specification). An example mapping is shown in Table 1 below.

For example, the UE115may determine that an offset level associated with the subband305-brelative to the subband320-bis between 0 dB and 1 dB for a first antenna and, based on the mapping, may determine that a differential value associated with the subband305-bis 0 for the first antenna. As such, the UE115may use a quantity of bits (such as 2 bits) to convey the differential value of 0 in the IM report. For example, the UE115may use a bit line of 00 to convey the differential IM information for the subband305-bfor the first antenna. As a further example, the UE115may determine that a second offset level associated with the subband305-brelative to the subband320-bis greater than 1 dB for a second antenna and, based on the mapping, may determine that a second differential value associated with the subband305-bis 2 for the second antenna. As such, the UE115may use a bit line of 10 to convey the differential IM information for the subband305-bfor the second antenna. The UE115may perform a similar process for each remaining subband across the quantity of antennas at the UE115to generate the differential IM information associated with the subband305-b,the subband310-b,and the subband315-b.Accordingly, the UE115may transmit the IM report in the CSI report including the differential IM information associated with the subband305-b,the subband310-b,and the subband315-band absolute IM information associated with the subband320-b.

In some examples, the UE115may use a configured quantity of bits to convey the IM information associated with each of the quantity of subbands. For example, the UE115may use N1 bits to convey the absolute IM information associated with the subband320-bfor each antenna and may use N2 bits to convey the differential IM information associated with the subband305-b,the subband310-b,and the subband315-bacross each antenna. As such, the IM report may include a number of bits equal to N_Rx*N1+(N_sub−1)*N_Rx*N2, where N_sub corresponds to the quantity of subbands of the channel used by the base station105and the UE115and N_Rx corresponds to the quantity of antennas at the UE115. In some aspects, N1 may be equal to any quantity of bits, but may sometimes be equal to 4, 5, 6, 7, or 8 bits and N2 may also be equal to any quantity of bits, but may sometimes be equal to 2, 3, or 4 bits. In some examples, the base station105may transmit an indication of the quantity of bits N1 and N2 to the UE115via RRC signaling or in other higher layer configurations. Alternatively, the quantity of bits N1 and N2 may be pre-configured at the UE115.

In some implementations, the bit line associated with each subband in the IM report may correspond to a subband-specific Rnnmatrix including IM information associated with each antenna of a subband. For example, the bit line for an ithsubband may correspond to an Rnn(SBi)matrix, as defined according to Equation (2) below, where each diagonal entry r11_i, . . . , rnn_imay correspond to IM information associated with one of the antennas of the quantity of antennas at the UE115.

In IM reporting configuration302, the base station105may set the indication (for example, information in the im-FormatIndicator field) to a differential subband IM setting, such as a subbandIM_differential setting, and the UE115may generate the IM report accordingly. In some examples, the UE115-amay determine the absolute IM information associated with each of a subband305-c,a subband310-c,a subband315-c,and a subband320-cand determine a bit line (a number of bits) corresponding to the absolute IM information associated with each antenna of each subband.

In some implementations, the UE115may determine to select or reference a frequency band, such as wideband325, as a baseline frequency band from which to determine the differential IM information. In such implementations, the UE115may average the absolute IM information associated with each of the subband305-c,the subband310-c,the subband315-c,and the subband320-cto determine baseline IM information associated with the wideband325.

Upon determining the baseline IM information associated with the wideband325, the UE115may determine an offset level associated with each subband relative to the baseline IM information associated with the wideband325. Based on determining the offset level associated with each subband, the UE115may determine a differential value (differential IM information) associated with each subband based on the offset level and a mapping between a set of differential values and a set of offset levels, such as the example mapping shown in Table 1.

For example, the UE115may determine that an offset level associated with the subband305-crelative to the wideband325is between 0 dB and 1 dB for a first antenna and, based on the mapping, may determine that a differential value associated with the subband305-cis 0 for the first antenna. As such, the UE115may use a quantity of bits (such as 2 bits) to convey the differential value of 0 in the IM report. For example, the UE115may use a bit line of 00 to convey the differential IM information for the subband305-cfor the first antenna. As another example, the UE115may determine that a second offset level associated with the subband305-crelative to the wideband325is greater than 1 dB for a second antenna and, based on the mapping, may determine that a second differential value associated with the subband305-cis 2 for the second antenna. As such, the UE115may use a bit line of 10 to convey the differential IM information for the subband305-cfor the second antenna. The UE115may perform a similar process for each remaining subband across the quantity of antennas at the UE115to generate the differential IM information associated with the subband305-c,the subband310-c,the subband315-c,and the subband320-c.Accordingly, the UE115may transmit the IM report in the CSI report including the differential IM information associated with the subband305-c,the subband310-c,the subband315-c,and the subband320-cand including the absolute IM information associated with the wideband325(the baseline IM information).

In such examples in which the absolute IM information associated with the wideband325is referenced as the baseline for differential IM reporting, the bit line associated with each subband in the IM report may correspond to a subband-specific Rnnmatrix including IM information associated with each antenna of a subband. Further, the UE115may include, in the IM report, a bit line associated with the absolute IM information associated with the wideband325. As such, the base station105may determine, for example, by performing an inverse operation relative to the UE115, the absolute IM information associated with each subband based on the absolute IM information associated with the wideband325and the mapping between the set of differential values and the set of offset values. In some aspects, the bit line associated with the absolute IM information associated with the wideband325may correspond to a wideband-specific Rnnmatrix, as defined according to Equation (3) below, where each diagonal entry r11, . . . , rnnmay correspond to IM information associated with one of the antennas of the quantity of antennas at the UE115.

FIG.4illustrates an example of a process flow400that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. In some examples, the process flow400may implement aspects of a wireless communications system100or a wireless communications system200. The process flow400may include a UE115-band a base station105-b,which may be examples of the corresponding devices described with reference toFIGS.1-3. The base station105-band the UE115-bmay implement one or more techniques for reducing overhead associated with an IM report by supporting one or both of a differential resource setting or a differential spatial setting of a configuration for the IM report.

At405, the base station105-bmay determine a setting of a configuration for generating an interference measurement report at a UE. In some examples, the base station105-bmay determine the setting based on determining that a downlink channel property, such as a frequency variant property, satisfies a threshold. The threshold may refer to a threshold level of frequency variance or a threshold level of IM information variance across a quantity of subbands of the downlink channel. Additionally or alternatively, the threshold may refer to a threshold level of IM information variance across a quantity of antennas (for example, receive antennas) at the UE115-b.In some other examples, the base station105-bmay determine the setting based on receiving a CSI report including a field indicating a request to change the setting to one or both of an absolute or differential resource setting or an absolute or differential spatial setting. In examples in which the setting is a resource setting, the setting may include a wideband IM setting, an absolute subband IM setting, or a differential subband IM setting. In some specific implementations, such a wideband IM setting, an absolute subband IM setting, or a differential subband IM setting may be referred to as a widebandIM setting, a subbandIM_absolute setting, or a subbandIM_differential setting, respectively.

At410, the base station105-bmay transmit, to the UE115-b,a control message including an indication associated with the configuration for generating the IM report in a CSI report. In some implementations, the base station105-bmay transmit the control message to the UE115-bvia RRC signaling. In some examples, the indication may include information in an im-FormatIndicator field and the configuration may include one or more higher layer parameters, such as a CSI-ReportConfig parameter. The indication may include the setting of the configuration for generating the interference measurement report at the UE and, as such, the indication may include one or both of an absolute or differential resource setting or an absolute or differential spatial setting.

At415, the base station105-bmay, in some implementations, transmit an indication of a mapping to the UE115-b.In some examples, the mapping may include a correspondence between a set of differential values and a set of offset levels that the UE115-bmay use to determine differential IM information associated with one or more subbands. In some aspects, the base station105-bmay transmit the indication of the mapping to the UE115-bvia RRC signaling. Additionally, in some implementations, the base station105-bmay adjust or update the mapping via dynamic signaling, such as DCI (for example, the DCI transmitted at425).

At420, the base station105-bmay, in some implementations, transmit an indication of one or more quantities of bits to the UE115-b.In some aspects, the base station105-bmay transmit the one or more quantities of bits to the UE115-bvia RRC signaling. In some examples, the base station105-bmay transmit an indication of two quantities of bits, such as N1 bits and N2 bits, and the UE115-bmay use one of the two quantities of bits (such as the N1 bits) to convey absolute IM information associated with each antenna of one or more subbands and the other of the two quantities of bits (such as the N2 bits) to convey differential IM information associated with each antenna of one or more subbands. In some other examples, the base station105-bmay transmit an indication of a single quantity of bits and the UE115-bmay use the single quantity of bits to perform uniform quantization across a quantity of antennas at the UE115-brelative to a first antenna (for example, an antenna associated with the lowest interference). In some other examples, the base station105-bmay transmit an indication of a quantity of bits for each antenna of the quantity of antennas at the UE115-b.In such examples, the UE115-bmay perform non-uniform quantization across the quantity of antennas at the UE115-brelative to the first antenna.

At425, the base station105-bmay, in some implementations, transmit a downlink control message to the UE115-bthat includes triggering information associated with the setting of the configuration. In some aspects, the base station105-bmay transmit the downlink control message in DCI. In some examples, the downlink control message may dynamically activate or deactivate the setting of the configuration to a differential IM setting (either a differential resource setting or a differential spatial setting, or both). For example, the base station105-bmay dynamically activate the setting to the differential IM setting based on determining that a downlink channel property satisfies a threshold or based on receiving a field in a CSI report from the UE115-bindicating a request to activate the setting to the differential IM setting.

At430, the UE115-bmay determine the setting of the configuration for the IM report based on the indication associated with the configuration for the IM report. The UE115-bmay determine that the setting includes a resource setting or a spatial setting, or both. In examples in which the setting is a resource setting, the setting may include a wideband IM setting, an absolute subband IM setting, or a differential subband IM setting. In some specific implementations, such a wideband IM setting, an absolute subband IM setting, or a differential subband IM setting may be referred to as a widebandIM setting, a subbandIM_absolute setting, or a subbandIM_differential setting, respectively.

At435, the UE115-bmay generate the IM report based on one or more of the resource setting, the quantity of subbands, the spatial setting, or the quantity of antennas. In some examples, the UE115-bmay generate the IM report including differential IM information for at least a subset of the number of subbands or antennas relative to absolute IM information associated with a baseline subband or wideband or a baseline antenna. In some other examples, the UE115-bmay generate the IM report including absolute IM information associated with each subband and each antenna.

At440, the UE115-bmay transmit, to the base station105-b,the CSI report including the IM report based on the setting of the configuration for the IM report. In some examples, the UE115-bmay transmit the IM report in an IM report-only CSI report (a reduced-size CSI report). In some other examples, the UE115-bmay transmit the IM report in the CSI report along with or coupled with one or more other fields. For example, in the case that the setting is a wideband IM setting (widebandIM), the UE115-bmay transmit the IM report via a CQI field in the CSI report.

FIG.5shows a block diagram of a device505that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The device505may be an example of aspects of a UE115. The device505may include a receiver510, a communications manager515, and a transmitter520. The communications manager515can be implemented, at least in part, by one or both of a modem and a processor. Each of these components may be in communication with one another (for example, via one or more buses).

The receiver510may receive information such as packets, user data, or control information associated with various information channels (for example, control channels, data channels, and information related to differential mode for interference-specific CSI report). Information may be passed on to other components of the device505. The receiver510may be an example of aspects of the transceiver820described with reference toFIG.8. The receiver510may utilize a single antenna or a set of antennas.

The communications manager515may receive, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report, determine a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report, and transmit, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report. The communications manager515may be an example of aspects of the communications manager810described herein.

The transmitter520may transmit signals generated by other components of the device505. In some examples, the transmitter520may be collocated with a receiver510in a transceiver component. For example, the transmitter520may be an example of aspects of the transceiver820described with reference toFIG.8. The transmitter520may utilize a set of antennas.

In some examples, the communications manager515may be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver510and the transmitter520may be implemented as analog components (for example, amplifiers, filters, antennas) coupled with the mobile device modem to enable wireless transmission and reception over one or more bands.

The communications manager515may be implemented to realize one or more potential advantages. In some implementations of the present disclosure, the communications manager515may generate an IM report based on a setting of a configuration for the IM report. In some examples, the setting may account for or otherwise be based on a channel property, such as a frequency variant property. As such, the communications manager515may generate the IM report using an efficient amount of uplink resources based on the channel property. Further, the communications manager515may determine that the setting includes one or both of a differential resource setting or a differential spatial setting, which may reduce the number of bits that the communications manager515may use to generate the IM report and, therefore, may reduce the amount of uplink resources that the communications manager515may use to transmit the IM report to a base station105, which may decrease system overhead and improve the spectral efficiency of the system.

Moreover, by using fewer uplink resources to transmit the IM report, the device505may spend less time transmitting, which may enable one or more processing units of the device505to enter a sleep mode. Accordingly, the device505may potentially improve power savings and increase the battery life of the device505.

FIG.6shows a block diagram of a device605that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The device605may be an example of aspects of a device505, or a UE115. The device605may include a receiver610, a communications manager615, and a transmitter635. The communications manager615can be implemented, at least in part, by one or both of a modem and a processor. Each of these components may be in communication with one another (for example, via one or more buses).

The receiver610may receive information such as packets, user data, or control information associated with various information channels (for example, control channels, data channels, and information related to differential mode for interference-specific CSI report). Information may be passed on to other components of the device605. The receiver610may be an example of aspects of the transceiver820described with reference toFIG.8. The receiver610may utilize a single antenna or a set of antennas.

The communications manager615may be an example of aspects of the communications manager515. The communications manager615may include a configuration manager620, a setting manager625, and a CSI manager630. The communications manager615may be an example of aspects of the communications manager810described herein.

The configuration manager620may receive, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report. The setting manager625may determine a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report. The CSI manager630may transmit, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report.

The transmitter635may transmit signals generated by other components of the device605. In some examples, the transmitter635may be collocated with a receiver610in a transceiver component. For example, the transmitter635may be an example of aspects of the transceiver820described with reference toFIG.8. The transmitter635may utilize a set of antennas.

FIG.7shows a block diagram of a communications manager705that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The communications manager705may be an example of aspects of a communications manager515, a communications manager615, or a communications manager810described herein. The communications manager705may include a configuration manager710, a setting manager715, a CSI manager720, a subband manager725, an IM report manager730, an IM information manager735, a differential manager740, a mapping manager745, an antenna manager750, a DCI manager755, an activation manager760, and a channel manager765. Each of these components may communicate, directly or indirectly, with one another (for example, via one or more buses).

The configuration manager710may receive, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report.

The setting manager715may determine a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report. In some examples, the setting manager715may determine to change the setting to one or both of a differential resource setting or a differential spatial setting based on determining that the downlink channel property satisfies the threshold. In some examples, the CSI report includes a field indicating a request to change the setting to one or both of the differential resource setting or the differential spatial setting.

The CSI manager720may transmit, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report.

The subband manager725may determine a quantity of subbands associated with the IM report.

The IM report manager730may generate the IM report based on the quantity of subbands and the resource setting. In some examples, the IM report manager730may transmit the IM report via a CQI field in the CSI report. In some examples, the IM report manager730may generate the IM report based on the resource setting, the quantity of subbands, the spatial setting, and a quantity of antennas.

In some examples, the IM report manager730may generate the IM report based on the quantity of antennas and the spatial setting. In some examples, the IM report manager730may generate the IM report is based on receiving the downlink control message and one or both of the differential resource setting or the differential spatial setting.

The IM information manager735may determine first IM information associated with each subband of the quantity of subbands. In some examples, the IM information manager735may average the first IM information associated with each subband of the quantity of subbands. In some examples, the IM information manager735may determine second IM information associated with each subband of the quantity of subbands based on the average of the first IM information associated with each subband of the quantity of subbands. In some examples, the IM report includes the second IM information associated with each subband of the quantity of subbands and the average of the first IM information associated with each subband of the quantity of subbands.

In some examples, the IM information manager735may determine the second IM information associated with each subband of the quantity of subbands based on the resource setting. In some examples, the IM information manager735may determine first IM information associated with a first subband of the quantity of subbands. In some examples, the IM information manager735may determine second IM information associated with each remaining subband of the quantity of subbands. In some examples, the IM report includes the first IM information associated with the first subband and the second IM information associated with each remaining subband of the quantity of subbands.

In some examples, the IM information manager735may determine the first IM information associated with the first subband and the second IM information associated with each remaining subband of the quantity of subbands based on the resource setting. In some examples, the IM information manager735may receive, from the base station, an indication of a first quantity of bits and a second quantity of bits, where.

In some examples, the IM information manager735may determine IM information associated with a frequency band including the quantity of subbands. In some examples, the IM report includes the IM information. In some examples, the IM information manager735may determine first IM information associated with each subband of the quantity of subbands.

In some examples, the IM information manager735may average the first IM information associated with each subband of the quantity of subbands. In some examples, the IM information associated with the frequency band including the quantity of subbands includes the average of the first IM information associated with each subband of the quantity of subbands. In some examples, the IM information manager735may determine one or both of first complete IM information or first differential IM information associated with each subband of the quantity of subbands based on the resource setting.

In some examples, the IM information manager735may determine second differential IM information associated with each antenna of the quantity of antennas based on the spatial setting. In some examples, the IM report includes one or more of the first complete IM information, the first differential IM information, or the second differential IM information.

In some examples, the IM information manager735may determine second complete IM information associated with each antenna of the quantity of antennas. In some examples, the IM information manager735may determine the second differential IM information associated with each antenna of the quantity of antennas based on a ratio between the second complete IM information associated with each antenna of the quantity of antennas and the second complete IM information associated with a first antenna of the quantity of antennas. In some examples, the IM information manager735may determine first IM information associated with each antenna of the quantity of antennas.

In some examples, the IM information manager735may determine second IM information associated with each antenna of the quantity of antennas based on a ratio between the first IM information associated with each antenna of the quantity of antennas and the first IM information associated with a first antenna of the quantity of antennas. In some examples, the IM report includes the first IM information associated with the first antenna and the second IM information associated with each antenna of the quantity of antennas.

In some examples, the IM information manager735may receive, from the base station, an indication of one or more quantities of bits for determining the second IM information associated with each antenna of the quantity of antennas. In some examples, the IM information manager735may determine the second IM information associated with each antenna of the quantity of antennas based on the one or more quantities of bits and a range of IM ratios. In some examples, the range of IM ratios includes the ratio.

In some examples, the IM information manager735may receive an indication of a quantity of bits for each antenna of the quantity of antennas. In some examples, the IM information manager735may receive the indication of the one or more quantities of bits includes receiving the indication of the one or more quantities of bits via RRC signaling. In some examples, the indication of the one or more quantities of bits indicates only a single quantity of bits.

In some examples, the first IM information includes complete IM information and the second IM information includes differential IM information. In some examples, the first IM information includes complete IM information and the second IM information includes differential IM information relative to the complete IM information. In some examples, the second IM information includes the ratio.

The differential manager740may determine an offset level associated with each subband of the quantity of subbands relative to the average of the first IM information associated with each subband of the quantity of subbands. In some examples, differential manager740may determine a differential value associated with each subband of the quantity of subbands based on the offset level and a mapping including a correspondence between one or more offset levels and one or more differential values. In some examples, the second IM information includes the differential value.

In some examples, the differential manager740may determine an offset level associated with the each remaining subband of the quantity of subbands relative to the first IM information associated with the first subband. In some examples, differential manager740may determine a differential value associated with the each remaining subband of the quantity of subbands based on the offset level and a mapping including a correspondence between one or more offset levels and one or more differential values. In some examples, the second IM information includes the differential value.

The mapping manager745may receive, from the base station, an indication of the mapping.

The antenna manager750may determine a quantity of antennas associated with the IM report.

The DCI manager755may receive, from the base station, a downlink control message that includes triggering information associated with the setting of the configuration.

The activation manager760may activate the setting of the configuration for the IM report based on the triggering information. In some examples, the setting includes one or both of a differential resource setting or a differential spatial setting, where.

The channel manager765may determine that a downlink channel property satisfies a threshold.

FIG.8shows a diagram of a system including a device805that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The device805may be an example of or include the components of device505, device605, or a UE115. The device805may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager810, an input/output (I/O) controller815, a transceiver820, an antenna825, memory830, and a processor840. These components may be in electronic communication via one or more buses (for example, bus845).

The communications manager810may receive, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report, determine a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report, and transmit, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report.

In some examples, the wireless device may include a single antenna825. However, in some examples the device may have more than one antenna825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory830may include random-access memory (RAM) and read-only memory (ROM). The memory830may store computer-readable, computer-executable code835including instructions that, when executed, cause the processor to perform various functions described herein. In some examples, the memory830may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor840may include an intelligent hardware device, (for example, a general-purpose processor, a digital signal processor (DSP), a central processing unit (CPU), a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some examples, the processor840may be configured to operate a memory array using a memory controller. In other cases, a memory controller may be integrated into the processor840. The processor840may be configured to execute computer-readable instructions stored in a memory (for example, the memory830) to cause the device805to perform various functions (for example, functions or tasks supporting differential mode for interference-specific CSI report).

FIG.9shows a block diagram of a device905that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The device905may be an example of aspects of a base station105. The device905may include a receiver910, a communications manager915, and a transmitter920. The communications manager915can be implemented, at least in part, by one or both of a modem and a processor. Each of these components may be in communication with one another (for example, via one or more buses).

The communications manager915may determine a setting of a configuration for generating an IM report at a UE, transmit, to the UE, a control message including an indication associated with the configuration for generating the IM report in a CSI report, and receive, from the UE, the CSI report including the IM report based on the setting and transmitting the control message including the indication. The communications manager915may be an example of aspects of the communications manager1210described herein.

The transmitter920may transmit signals generated by other components of the device905. In some examples, the transmitter920may be collocated with a receiver910in a transceiver component. For example, the transmitter920may be an example of aspects of the transceiver1220described with reference toFIG.12. The transmitter920may utilize a set of antennas.

The device905, based on determining the setting of the configuration for generating the IM report at the UE, may reduce the overhead associated with the CSI report including the IM report, which may improve the spectral efficiency of the system. Further, by implementing one or more of the techniques described herein, the device905may have greater flexibility and control of the configuration for generating the IM report and the device905may use the greater flexibility and control to more optimally configure the IM report based on a channel property. As such, the device905may reduce the overhead of the CSI report including the IM report while also maintaining reliable performance of the CSI reporting procedure.

FIG.10shows a block diagram of a device1005that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The device1005may be an example of aspects of a device905, or a base station105. The device1005may include a receiver1010, a communications manager1015, and a transmitter1035. The communications manager1015can be implemented, at least in part, by one or both of a modem and a processor. Each of these components may be in communication with one another (for example, via one or more buses).

The receiver1010may receive information such as packets, user data, or control information associated with various information channels (for example, control channels, data channels, and information related to differential mode for interference-specific CSI report). Information may be passed on to other components of the device1005. The receiver1010may be an example of aspects of the transceiver1220described with reference toFIG.12. The receiver1010may utilize a single antenna or a set of antennas.

The communications manager1015may be an example of aspects of the communications manager915. The communications manager1015may include a setting manager1020, a configuration manager1025, and a CSI manager1030. The communications manager1015may be an example of aspects of the communications manager1210described herein.

The setting manager1020may determine a setting of a configuration for generating an IM report at a UE. The configuration manager1025may transmit, to the UE, a control message including an indication associated with the configuration for generating the IM report in a CSI report. The CSI manager1030may receive, from the UE, the CSI report including the IM report based on the setting and transmitting the control message including the indication.

The transmitter1035may transmit signals generated by other components of the device1005. In some examples, the transmitter1035may be collocated with a receiver1010in a transceiver component. For example, the transmitter1035may be an example of aspects of the transceiver1220described with reference toFIG.12. The transmitter1035may utilize a set of antennas.

FIG.11shows a block diagram of a communications manager1105that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The communications manager1105may be an example of aspects of a communications manager915, a communications manager1015, or a communications manager1210described herein. The communications manager1105may include a setting manager1110, a configuration manager1115, a CSI manager1120, a subband manager1125, an IM report manager1130, an IM information manager1135, a differential manager1140, a mapping manager1145, an antenna manager1150, and a DCI manager1155. Each of these components may communicate, directly or indirectly, with one another (for example, via one or more buses).

The setting manager1110may determine a setting of a configuration for generating an IM report at a UE.

The configuration manager1115may transmit, to the UE, a control message including an indication associated with the configuration for generating the IM report in a CSI report.

The CSI manager1120may receive, from the UE, the CSI report including the IM report based on the setting and transmitting the control message including the indication. In some examples, the CSI manager1120may receive the CSI report including the IM report based on the quantity of antennas and the spatial setting. In some examples, the CSI manager1120may receive, from the UE, the CSI report including a field indicating a request to change the setting to one or both of a differential resource setting or a differential spatial setting. In some examples, determining the setting of the configuration for generating the IM report is based on receiving the CSI report including the field.

The subband manager1125may determine a quantity of subbands associated with the IM report.

The IM report manager1130may receive the CSI report including the IM report based on the quantity of subbands and the resource setting. In some examples, the IM report manager1130may receive the IM report via a CQI field in the CSI report. In some examples, the IM report manager1130may receive the IM report based on the resource setting, the quantity of subbands, the spatial setting, and a quantity of antennas.

The IM information manager1135may receive, in the IM report, second IM information associated with each subband of the quantity of subbands and an average of first IM information associated with each subband of the quantity of subbands. In some examples, the IM information manager1135may determine the first IM information associated with each subband of the quantity of subbands based on the second IM information and the average of the first IM information associated with each subband of the quantity of subbands.

In some examples, the IM information manager1135may determine the first IM information associated with each subband of the quantity of subbands based on the offset level and the average of the first IM information associated with each subband of the quantity of subbands. In some examples, the IM information manager1135may receive, in the IM report, first IM information associated with a first subband of the quantity of subbands and second IM information associated with each remaining subband of the quantity of subbands.

In some examples, the IM information manager1135may determine the first IM information associated with each remaining subband of the quantity of subbands based on the second IM information and the first IM information associated with the first subband. In some examples, the IM information manager1135may determine the first IM information associated with each remaining subband of the quantity of subbands based on the offset level and the first IM information associated with the first subband.

In some examples, the IM information manager1135may transmit, to the UE, an indication of a first quantity of bits and a second quantity of bits, where. In some examples, the IM information manager1135may receive, in the IM report, IM information associated with a frequency band including the quantity of subbands. In some examples, the IM information manager1135may determine first IM information associated with each subband of the quantity of subbands based on the IM information associated with the frequency band including the quantity of subbands and a CQI field.

In some examples, the IM information manager1135may receive one or both of first complete IM information or first differential IM information associated with each subband of the quantity of subbands based on the resource setting.

In some examples, the IM information manager1135may receive second differential IM information associated with each antenna of the quantity of antennas based on the spatial setting. In some examples, the IM report includes one or more of the first complete IM information, the first differential IM information, or the second differential IM information. In some examples, the IM information manager1135may receive second IM information associated with each antenna of the quantity of antennas. In some examples, the second IM information includes a ratio between first IM information associated with each antenna of the quantity of antennas and the first IM information associated with a first antenna of the quantity of antennas.

In some examples, the IM information manager1135may receive the first IM information associated with the first antenna. In some examples, the IM information manager1135may determine the first IM information associated with each antenna of the quantity of antennas based on the ratio and the first IM information associated with the first antenna.

In some examples, the IM information manager1135may transmit, to the UE, an indication of one or more quantities of bits for determining the second IM information associated with each antenna of the quantity of antennas. In some examples, the IM information manager1135may determine the first IM information associated with each antenna of the quantity of antennas based on one or more of the ratio, the first IM information associated with the first antenna, or the one or more quantities of bits. In some examples, the IM information manager1135may transmit an indication of a quantity of bits for each antenna of the quantity of antennas.

In some examples, the IM information manager1135may transmit the indication of the one or more quantities of bits includes transmitting the indication of the one or more quantities of bits via RRC signaling. In some examples, the first IM information includes complete IM information and the second IM information includes differential IM information relative to the complete IM information. In some examples, the first IM information includes complete IM information.

In some examples, the indication of the one or more quantities of bits indicates only a single quantity of bits. In some examples, the first IM information includes complete IM information and the second IM information includes differential IM information.

The differential manager1140may determine a differential value associated with each subband of the quantity of subbands, In some examples, the second IM information includes the differential value. In some examples, the differential manager1140may determine an offset level associated with each subband of the quantity of subbands relative to the average of the first IM information associated with each subband of the quantity of subbands based on the differential value and a mapping including a correspondence between one or more offset levels and one or more differential values.

In some examples, the differential manager1140may determine a differential value associated with each remaining subband of the quantity of subbands. In some examples, the second IM information includes the differential value. In some examples, the differential manager1140may determine an offset level associated with each remaining subband of the quantity of subbands relative to the first IM information associated with the first subband based on the differential value and a mapping including a correspondence between one or more offset levels and one or more differential values.

The mapping manager1145may transmit, to the UE, an indication of the mapping.

The antenna manager1150may determine a quantity of antennas associated with the IM report.

The DCI manager1155may transmit, to the UE, a downlink control message that includes triggering information associated with the setting of the configuration. In some examples, the setting includes one or both of a differential resource setting or a differential spatial setting.

FIG.12shows a diagram of a system including a device1205that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The device1205may be an example of or include the components of device905, device1005, or a base station105. The device1205may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager1210, a network communications manager1215, a transceiver1220, an antenna1225, memory1230, a processor1240, and an inter-station communications manager1245. These components may be in electronic communication via one or more buses (for example, bus1250).

The communications manager1210may determine a setting of a configuration for generating an IM report at a UE, transmit, to the UE, a control message including an indication associated with the configuration for generating the IM report in a CSI report, and receive, from the UE, the CSI report including the IM report based on the setting and transmitting the control message including the indication.

The network communications manager1215may manage communications with the core network (for example, via one or more wired backhaul links). For example, the network communications manager1215may manage the transfer of data communications for client devices, such as one or more UEs115.

In some examples, the wireless device may include a single antenna1225. However, in some examples the device may have more than one antenna1225, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory1230may include RAM, ROM, or a combination thereof. The memory1230may store computer-readable code1235including instructions that, when executed by a processor (for example, the processor1240) cause the device to perform various functions described herein. In some examples, the memory1230may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor1240may include an intelligent hardware device, (for example, a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some examples, the processor1240may be configured to operate a memory array using a memory controller. In some examples, a memory controller may be integrated into processor1240. The processor1240may be configured to execute computer-readable instructions stored in a memory (for example, the memory1230) to cause the device1205to perform various functions (for example, functions or tasks supporting differential mode for interference-specific CSI report).

FIG.13shows a flowchart illustrating a method1300that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The operations of method1300may be implemented by a UE115or its components. For example, the operations of method1300may be performed by a communications manager as described with reference toFIGS.5-8. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At1305, the UE may receive, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report. The operations of1305may be performed according to the methods described herein. In some examples, aspects of the operations of1305may be performed by a configuration manager as described with reference toFIGS.5-8.

At1310, the UE may determine a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report. The operations of1310may be performed according to the methods described herein. In some examples, aspects of the operations of1310may be performed by a setting manager as described with reference toFIGS.5-8.

At1315, the UE may transmit, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report. The operations of1315may be performed according to the methods described herein. In some examples, aspects of the operations of1315may be performed by a CSI manager as described with reference toFIGS.5-8.

At1405, the UE may receive, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report. The operations of1405may be performed according to the methods described herein. In some examples, aspects of the operations of1405may be performed by a configuration manager as described with reference toFIGS.5-8.

At1410, the UE may determine a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report. The operations of1410may be performed according to the methods described herein. In some examples, aspects of the operations of1410may be performed by a setting manager as described with reference toFIGS.5-8.

At1415, the UE may determine a quantity of subbands associated with the IM report. The operations of1415may be performed according to the methods described herein. In some examples, aspects of the operations of1415may be performed by a subband manager as described with reference toFIGS.5-8.

At1420, the UE may generate the IM report based on the quantity of subbands and the resource setting. The operations of1420may be performed according to the methods described herein. In some examples, aspects of the operations of1420may be performed by an IM report manager as described with reference toFIGS.5-8.

At1425, the UE may transmit, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report. The operations of1425may be performed according to the methods described herein. In some examples, aspects of the operations of1425may be performed by a CSI manager as described with reference toFIGS.5-8.

At1505, the UE may receive, from a base station, a control message including an indication associated with a configuration for an IM report in a CSI report. The operations of1505may be performed according to the methods described herein. In some examples, aspects of the operations of1505may be performed by a configuration manager as described with reference toFIGS.5-8.

At1510, the UE may determine a setting of the configuration for the IM report based on the indication associated with the configuration for the IM report. The operations of1510may be performed according to the methods described herein. In some examples, aspects of the operations of1510may be performed by a setting manager as described with reference toFIGS.5-8.

At1515, the UE may determine a quantity of antennas associated with the IM report. The operations of1515may be performed according to the methods described herein. In some examples, aspects of the operations of1515may be performed by an antenna manager as described with reference toFIGS.5-8.

At1520, the UE may generate the IM report based on the quantity of antennas and the spatial setting. The operations of1520may be performed according to the methods described herein. In some examples, aspects of the operations of1520may be performed by an IM report manager as described with reference toFIGS.5-8.

At1525, the UE may transmit, to the base station, the CSI report including the IM report based on the setting of the configuration for the IM report. The operations of1525may be performed according to the methods described herein. In some examples, aspects of the operations of1525may be performed by a CSI manager as described with reference toFIGS.5-8.

FIG.16shows a flowchart illustrating a method1600that supports one or more differential modes for interference-specific CSI reporting in accordance with aspects of the present disclosure. The operations of method1600may be implemented by a base station105or its components. For example, the operations of method1600may be performed by a communications manager as described with reference toFIGS.9-12. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.

At1605, the base station may determine a setting of a configuration for generating an IM report at a UE. The operations of1605may be performed according to the methods described herein. In some examples, aspects of the operations of1605may be performed by a setting manager as described with reference toFIGS.9-12.

At1610, the base station may transmit, to the UE, a control message including an indication associated with the configuration for generating the IM report in a CSI report. The operations of1610may be performed according to the methods described herein. In some examples, aspects of the operations of1610may be performed by a configuration manager as described with reference toFIGS.9-12.

At1615, the base station may receive, from the UE, the CSI report including the IM report based on the setting and transmitting the control message including the indication. The operations of1615may be performed according to the methods described herein. In some examples, aspects of the operations of1615may be performed by a CSI manager as described with reference toFIGS.9-12.