Techniques for Simplifying Channel State Information Feedback

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may send a capability report indicating a trigger offset to a base station. The base station may configure the UE to have one or more channel state information (CSI) measurement resource configurations and send downlink control information (DCI) that triggers an aperiodic CSI report for at least some of the CSI measurement resources in the CSI measurement resources. The UE may report CSI by measuring the CSI resources after a trigger offset. In some cases, CSI reports associated with different codebook types (e.g., type I, type II) may be modified, where, after identifying the codebook type and determining which type of codebook to process (e.g., based on the number of CSI processing units), the UE may identify priorities associated with different CSI reports. The UE may be configured with various parameters that relax or modify the processing of type II CSI reports.

Description

Technical Field

[0001] Generally speaking, the following relates to wireless communication, and more specifically, the following relates to techniques for simplifying channel state information feedback. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcasting, etc. These systems are capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multi-access systems include fourth-generation (4G) systems such as Long Term Evolution (LTE) systems, enhanced LTE (LTE-A) systems, or LTE-A Pro systems, and fifth-generation (5G) systems that may be referred to as New Radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multi-access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication for multiple communication devices (which may alternatively be referred to as user equipment (UE)).

[0003] In some wireless communication systems, a base station may configure a UE for aperiodic channel state information (CSI) reporting. However, in some examples, aperiodic CSI reporting may result in relatively high UE processing complexity (e.g., due to signal buffering at the UE). In other examples, one type of CSI codebook for CSI reporting may pose relatively high requirements on the UE. In either case, a complex CSI reporting process may lead to delays, inefficient communication, and increased power consumption. Summary of the Invention

[0004] The described techniques relate to improved methods, systems, devices, and apparatuses that support techniques for simplifying channel state information (CSI) feedback. Generally speaking, the described techniques enable a network such as a base station to configure a user equipment (UE) to have relaxed buffering for aperiodic CSI reporting. For example, the UE may send a capability report indicating a time delay (e.g., a triggering offset) to the base station. The base station may configure the UE to have one or more CSI measurement resources and send downlink control information (DCI) to the UE, where the DCI triggers a CSI report for at least some of the configured CSI measurement resources. The UE may generate a CSI report based on the CSI measurement resources and the triggering offset, where the UE may not expect to receive the CSI measurement resources before the end of the triggering offset. The triggering offset may allow the UE time to decode the received DCI, thereby reducing the amount of signal buffering performed by the UE.

[0005] In some cases, the DCI may trigger CSI reports associated with different codebook types (e.g., type I, type II codebooks). The CSI reports associated with different codebook types may be modified to reduce the computational burden on the UE. For example, the UE may utilize priorities associated with different CSI codebook types, where the UE may identify the codebook type to be processed before identifying the priority. In some cases, when the UE is triggered to report CSI associated with a type II codebook and CSI associated with a type I codebook, the UE may identify multiple CSI processing units (CPUs) for updating the type I and type II codebooks and may process the CSI based on the CPUs identified for each type of codebook, which may further be based on the identified priorities. In other examples, the UE may be configured with various parameters (e.g., CSI processing time, maximum rank) that relax or modify the processing of type II CSI reports, and the UE may process type II CSI reports in a different manner than type I CSI reports based on these parameters. Here, the various parameters may enable the UE to more efficiently generate CSI reports for codebooks associated with relatively higher complexity (e.g., compared to other CSI reports associated with other codebooks).

[0006] A method for wireless communication at a UE is described. The method may include: sending to a base station a capability report indicating an aperiodic CSI measurement resource trigger offset supported by the UE; receiving a configuration of one or more aperiodic CSI measurement resources; receiving DCI that triggers a CSI report for a first aperiodic CSI measurement resource subset among the one or more aperiodic CSI measurement resources, the DCI being based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset; and sending to the base station a CSI report indicating measurements of the first aperiodic CSI measurement resource subset.

[0007] A device for wireless communication at a UE is described. The device may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the device to perform the following operations: sending to a base station a capability report indicating an aperiodic CSI measurement resource trigger offset supported by the UE; receiving a configuration of one or more aperiodic CSI measurement resources; receiving DCI that triggers a CSI report for a first aperiodic CSI measurement resource subset among the one or more aperiodic CSI measurement resources, the DCI being based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset; and sending to the base station a CSI report indicating measurements of the first aperiodic CSI measurement resource subset.

[0008] Another device for wireless communication at a UE is described. The device may include units for performing the following operations: sending to a base station a capability report indicating an aperiodic CSI measurement resource trigger offset supported by the UE; receiving a configuration of one or more aperiodic CSI measurement resources; receiving DCI that triggers a CSI report for a first aperiodic CSI measurement resource subset among the one or more aperiodic CSI measurement resources, the DCI being based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset; and sending to the base station a CSI report indicating measurements of the first aperiodic CSI measurement resource subset.

[0009] A non - transitory computer - readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: send a capability report indicating an aperiodic CSI measurement resource trigger offset supported by the UE to a base station; receive a configuration of one or more aperiodic CSI measurement resources; receive DCI triggering a CSI report for a first subset of aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources, the DCI being based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset; and send a CSI report to the base station, the CSI report indicating measurements of the first subset of aperiodic CSI measurement resources.

[0010] In some examples of the methods, apparatuses, and non - transitory computer - readable media described herein, sending the capability report may include operations, features, units, or instructions for: sending the capability report indicating the aperiodic CSI measurement resource trigger offset, where the aperiodic CSI measurement resource trigger offset may be a threshold duration after receiving the DCI within which the UE can receive the one or more aperiodic CSI measurement resources.

[0011] In some examples of the methods, apparatuses, and non - transitory computer - readable media described herein, sending the capability report may include operations, features, units, or instructions for: sending the capability report indicating the aperiodic CSI measurement resource trigger offset, where the aperiodic CSI measurement resource trigger offset indicates a processing time for decoding the DCI supported by the UE. In some examples of the methods, apparatuses, and non - transitory computer - readable media described herein, the aperiodic CSI measurement resource trigger offset indicates one or more symbol periods, one or more slot durations, or a combination thereof.

[0012] In some examples of the methods, apparatuses, and non - transitory computer - readable media described herein, sending the capability report may include operations, features, units, or instructions for: sending the capability report indicating a threshold number of aperiodic CSI measurement resources associated with the CSI report that the UE is capable of measuring, where the CSI report includes measurements of at least one aperiodic CSI measurement resource among the one or more aperiodic CSI measurement resources up to the threshold number.

[0013] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the threshold number of aperiodic CSI measurement resources indicates the maximum number of aperiodic CSI measurement resources associated with the CSI report that the UE is capable of measuring.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for the following: sending the capability report including an indication of the buffer memory size, wherein the configuration of the one or more aperiodic CSI measurement resources may be based on the buffer memory size. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the CSI report includes an aperiodic CSI report.

[0015] A method for wireless communication at a UE is described. The method may include: receiving DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generating, based on the first type of codebook and the second type of codebook, one of the first CSI report or the second CSI report using a set of one or more CPUs, wherein the first CSI report is processed based on the first type of codebook using each CPU in the set of one or more CPUs, or wherein the second CSI report is processed based on the second type of codebook using a subset of CPUs in the set of one or more CPUs, or a combination thereof; and sending the generated CSI report.

[0016] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to perform the following: receiving DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generating, based on the first type of codebook and the second type of codebook, one of the first CSI report or the second CSI report using a set of one or more CPUs, wherein the first CSI report is processed based on the first type of codebook using each CPU in the set of one or more CPUs, or wherein the second CSI report is processed based on the second type of codebook using a subset of CPUs in the set of one or more CPUs, or a combination thereof; and sending the generated CSI report.

[0017] Describes another apparatus for wireless communication at a UE. The apparatus may include units for performing the following operations: receiving DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generating, based on the first type of codebook and the second type of codebook, one of the first CSI report or the second CSI report using a set of one or more CPUs, wherein the first CSI report is processed based on the first type of codebook using each CPU in the set of one or more CPUs, or wherein the second CSI report is processed based on the second type of codebook using a subset of CPUs in the set of one or more CPUs, or a combination thereof; and transmitting the generated CSI report.

[0018] Describes a non-transitory computer-readable medium storing code for wireless communication at a UE. The code may include instructions executable by a processor to perform the following operations: receiving DCI from a base station, the DCI triggering a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generating, based on the first type of codebook and the second type of codebook, one of the first CSI report or the second CSI report using a set of one or more CPUs, wherein the first CSI report is processed based on the first type of codebook using each CPU in the set of one or more CPUs, or wherein the second CSI report is processed based on the second type of codebook using a subset of CPUs in the set of one or more CPUs, or a combination thereof; and transmitting the generated CSI report.

[0019] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for the following: identifying that the first CSI report may have a higher priority than the second CSI report; and avoiding updating the second CSI report based on generating the first CSI report using each CPU in the set of one or more CPUs. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, transmitting the generated CSI report includes transmitting the first CSI report.

[0020] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: identifying that the second CSI report may have a higher priority than the first CSI report; and avoiding updating the first CSI report based on generating the second CSI report using the subset of CPUs in the set of one or more CPUs. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, transmitting the generated CSI report includes transmitting the second CSI report. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first type of codebook includes a type II CSI codebook.

[0021] A method for wireless communication at a UE is described. The method may include: receiving DCI that triggers a first CSI report associated with a first type of codebook, or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generating the first CSI report using a first set of parameters and the first type of codebook, or generating the second CSI report using a second set of parameters and the second type of codebook, or a combination thereof, based on the received DCI; and transmitting the first CSI report or the second CSI report or a combination thereof.

[0022] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receive DCI that triggers a first CSI report associated with a first type of codebook, or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generate the first CSI report using a first set of parameters and the first type of codebook, or generate the second CSI report using a second set of parameters and the second type of codebook, or a combination thereof, based on the received DCI; and transmit the first CSI report or the second CSI report or a combination thereof.

[0023] Describes another apparatus for wireless communication at a UE. The apparatus may include units for performing the following operations: receiving DCI that triggers a first CSI report associated with a first type of codebook, or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generating the first CSI report using a first set of parameters and the first type of codebook, or generating the second CSI report using a second set of parameters and the second type of codebook, or a combination thereof, based on the received DCI; and transmitting the first CSI report or the second CSI report or a combination thereof.

[0024] Describes a non-transitory computer-readable medium storing code for wireless communication at a UE. The code may include instructions executable by a processor to perform the following operations: receiving DCI that triggers a first CSI report associated with a first type of codebook, or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; generating the first CSI report using a first set of parameters and the first type of codebook, or generating the second CSI report using a second set of parameters and the second type of codebook, or a combination thereof, based on the received DCI; and transmitting the first CSI report or the second CSI report or a combination thereof.

[0025] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, generating the first CSI report may include operations, features, units, or instructions for the following: identifying, from the first set of parameters, a first CSI calculation time set associated with the first CSI report, the first CSI calculation time set being different from a second CSI calculation time set associated with the second CSI report. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for the following: transmitting the first CSI report based on the first CSI calculation time set.

[0026] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, generating the second CSI report may include operations, features, units, or instructions for the following: identifying, from the second set of parameters, the second CSI calculation time set associated with the second CSI report, the second CSI calculation time set being different from the first CSI calculation time set associated with the first CSI report. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for the following: transmitting the second CSI report based on the second CSI calculation time set.

[0027] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, generating the first CSI report may include operations, features, units, or instructions for: identifying a rank threshold value associated with the first CSI report based on the first set of parameters. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: transmitting the first CSI report that does not include a rank indicator (RI) based on the rank threshold value.

[0028] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: identifying a first set of one or more aperiodic CSI measurement resources based on the first set of parameters, the first set of one or more aperiodic CSI measurement resources being configured for aperiodic CSI reporting. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: transmitting the first CSI report, which may be generated based on measurements of the one or more aperiodic CSI measurement resources.

[0029] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: transmitting a capability report that includes: a first capability indication of a UE's capability for concurrently generating the first CSI report and the second CSI report, a second capability indication for separately generating the first CSI report, a third capability indication for separately generating the second CSI report, or a combination thereof.

[0030] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first CSI report includes a wideband CSI report. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: receiving an indication of the first set of parameters and the second set of parameters from a base station.

[0031] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first type of codebook includes a type II CSI codebook. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, at least a portion of the first set of parameters may be different from the second set of parameters.

[0032] A method for wireless communication at a base station is described. The method may include: receiving, from a UE, a capability report including an indication of CSI reporting capabilities supported by the UE; identifying, based on the received capability report, a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof; transmitting a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration being based on the threshold number of the aperiodic CSI measurement resources or the UE memory size or a combination thereof; and transmitting DCI to the UE, the DCI triggering the CSI reporting for a subset of the aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources.

[0033] A device for wireless communication at a base station is described. The device may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the device to perform the following operations: receiving, from a UE, a capability report including an indication of CSI reporting capabilities supported by the UE; identifying, based on the received capability report, a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof; transmitting a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration being based on the threshold number of the aperiodic CSI measurement resources or the UE memory size or a combination thereof; and transmitting DCI to the UE, the DCI triggering the CSI reporting for a subset of the aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources.

[0034] Another device for wireless communication at a base station is described. The device may include units for performing the following operations: receiving, from a UE, a capability report including an indication of CSI reporting capabilities supported by the UE; identifying, based on the received capability report, a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof; transmitting a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration being based on the threshold number of the aperiodic CSI measurement resources or the UE memory size or a combination thereof; and transmitting DCI to the UE, the DCI triggering the CSI reporting for a subset of the aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources.

[0035] A non - transitory computer - readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to perform the following operations: receive, from a UE, a capability report including an indication of CSI reporting capabilities supported by the UE; identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof, based on the received capability report; transmit a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration being based on the threshold number of aperiodic CSI measurement resources or the UE memory size or a combination thereof; and transmit DCI to the UE, the DCI triggering the CSI report for a subset of the aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources.

[0036] In some examples of the methods, apparatuses, and non - transitory computer - readable media described herein, the received capability report includes an indication of the UE memory size, where the UE memory size indicates one or more symbol periods of a reception bandwidth for receiving the one or more aperiodic CSI measurement resources.

[0037] In some examples of the methods, apparatuses, and non - transitory computer - readable media described herein, the threshold number of aperiodic CSI measurement resources indicates the maximum number of aperiodic CSI measurement resources associated with the CSI report that the UE is capable of measuring.

[0038] A method for wireless communication at a base station is described. The method may include: configuring a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; transmitting DCI to a UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receiving, from the UE, the first CSI report or the second CSI report or a combination thereof based on the received DCI, where the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof.

[0039] Describes an apparatus for wireless communication at a base station. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to perform the following operations: configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; send DCI to the UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receive from the UE the first CSI report or the second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof.

[0040] Describes another apparatus for wireless communication at a base station. The apparatus may include units for performing the following operations: configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; send DCI to the UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receive from the UE the first CSI report or the second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof.

[0041] Describes a non-transitory computer-readable medium storing code for wireless communication at a base station. The code may include instructions executable by a processor to perform the following operations: configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; send DCI to the UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receive from the UE the first CSI report or the second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof.

[0042] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: configuring a first set of CSI calculation times associated with the first CSI report, the first set of CSI calculation times being different from a second set of CSI calculation times associated with the second CSI report. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving the first CSI report based on the first set of CSI calculation times.

[0043] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: configuring the second set of CSI calculation times associated with the second CSI report, the second set of CSI calculation times being different from the first set of CSI calculation times associated with the first CSI report. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving the second CSI report based on the second set of CSI calculation times.

[0044] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: configuring a rank threshold value associated with the first CSI report based on the first set of parameters. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving the first CSI report that is based on the rank threshold value and does not include RI.

[0045] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: configuring a first set of one or more aperiodic CSI measurement resources based on the first set of parameters, the first set of one or more aperiodic CSI measurement resources being configured for aperiodic CSI reporting. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving the first CSI report on the one or more aperiodic CSI measurement resources.

[0046] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving a capability report from the UE; and identifying, from the capability report, a first capability indication for concurrently generating the first CSI report and the second CSI report, a second capability indication for separately generating the first CSI report, a third capability indication for separately generating the second CSI report, or a combination thereof.

[0047] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first CSI report includes a broadband CSI report. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending an indication of the first parameter set and the second parameter set to the UE.

[0048] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first type of codebook includes a type II CSI codebook. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, at least a portion of the first parameter set may be different from the second parameter set. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Examples of systems for wireless communication that support techniques for simplifying channel state information (CSI) feedback in accordance with aspects of the present disclosure are shown.

[0050] Figure 2 Examples of wireless communication systems that support techniques for simplifying CSI feedback in accordance with aspects of the present disclosure are shown.

[0051] Figure 3 Examples of signaling schemes that support techniques for simplifying CSI feedback in accordance with aspects of the present disclosure are shown.

[0052] Figure 4A and 4B Examples of processing diagrams that support techniques for simplifying CSI feedback in accordance with aspects of the present disclosure are shown.

[0053] Figures 5 to 7 Examples of process flows in a system that support techniques for simplifying CSI feedback in accordance with aspects of the present disclosure are shown.

[0054] Figure 8 and 9 Examples of diagrams of devices that support techniques for simplifying CSI feedback in accordance with aspects of the present disclosure are shown.

[0055] Figure 10 A schematic diagram of a communication manager supporting techniques for simplifying CSI feedback in accordance with aspects of the present disclosure is shown.

[0056] Figure 11 A schematic diagram of a system including a device supporting techniques for simplifying CSI feedback in accordance with aspects of the present disclosure is shown.

[0057] Figure 12 and 13 A schematic diagram of a device supporting techniques for simplifying CSI feedback in accordance with aspects of the present disclosure is shown.

[0058] Figure 14 A schematic diagram of a communication manager supporting techniques for simplifying CSI feedback in accordance with aspects of the present disclosure is shown.

[0059] Figure 15 A schematic diagram of a system including a device supporting techniques for simplifying CSI feedback in accordance with aspects of the present disclosure is shown.

[0060] Figures 16 to 20 A flowchart illustrating a method supporting techniques for simplifying CSI feedback in accordance with aspects of the present disclosure is shown. Detailed Description

[0061] In some wireless communication systems, a user equipment (UE) may report channel state information (CSI) to a base station. The CSI report may relate to multiple CSI measurement resources, and the report may be configured to be periodic, aperiodic, or semi-persistent. For example, the base station may configure the UE to have one or more CSI measurement resources (e.g., resources carrying CSI reference signals (RSs)) for aperiodic CSI reporting. However, the UE may not know which CSI resource(s) to measure until after a downlink control information (DCI) from the base station triggers an aperiodic CSI report. Specifically, the DCI may indicate to the UE the resources to be used for the CSI report, and the UE may decode the DCI to identify the CSI resources to be used for the CSI report. Thus, when the UE receives the DCI that triggers an aperiodic CSI report, the UE may buffer the received signaling (e.g., in active and inactive bandwidth parts (BWPs)) until the DCI is decoded. Such buffering may result in relatively high power consumption and complexity requirements (such as memory size and sampling capabilities) at the UE. However, for some types of UEs, including low-complexity UEs (e.g., UEs with a reduced number of antennas, reduced transmit or receive bandwidth, reduced computational complexity, etc.), such buffering requirements may be restricted. Such UEs may be referred to as new radio (NR) light UEs.

[0062] In addition, the UE may support CSI reporting using different types of codebooks (e.g., type I single panel, type I multi-panel, type II, or a combination thereof). The UE may report the codebook capabilities to the base station, and the base station takes the codebook capabilities into account when configuring CSI reporting for the UE. The UE may indicate the codebook capability information for each codebook type in one or more lists. For example, the list may include the maximum number of transmit antenna ports per CSI resource, the maximum number of CSI resources, and the maximum total number of transmit antenna ports per frequency band. However, a low-complexity UE (e.g., an NR light UE) may under-report the UE capabilities to the base station to maintain support for CSI reporting using one or more codebook types, which may reduce the efficiency of CSI reporting and increase interference to other UEs (if the UE is grouped, e.g., for multi-user (MU)-multiple-input multiple-output (MIMO) transmission). Therefore, it may be desirable to utilize techniques for simplifying CSI feedback at the UE.

[0063] Accordingly, the techniques described herein may enable the UE to perform the CSI feedback process according to relaxed buffering requirements for aperiodic CSI reporting, which may allow the UE to reduce the complexity associated with CSI feedback, thereby improving power consumption and latency in the system by alleviating the processing burden on the UE. Aspects of the present disclosure provide for the use of a time delay or trigger offset (e.g., a CSI measurement resource trigger offset), which may be the time delay between receiving the DCI that triggers the aperiodic CSI report and the start of the CSI measurement resource for the corresponding measurement. The UE may not expect to receive the configured CSI reference signal (RS) for the CSI report triggered by the DCI until after the trigger offset, thereby allowing the UE time to decode the received DCI and reducing the amount of buffering performed by the UE. In other examples, the number of configured aperiodic CSI resources for CSI measurement may be limited, which may allow the UE to buffer less data when decoding the DCI (e.g., due to a reduced number of resources, including CSI-RS, that may potentially be used for measurement). Additionally or alternatively, the configuration of the CSI resources may be based on the buffering capabilities reported by the UE (e.g., the size of its memory), which may be reported in terms of the number of symbol periods for the receive bandwidth.

[0064] In addition, CSI reports using different codebook types (e.g., type I, type II) can be modified to reduce the computational burden on the UE. For example, the UE can utilize priorities associated with different CSI codebook types, where it can be expected that the UE does not support concurrent CSI when at least type II CSI is triggered. In some cases, when the UE is triggered to report CSI associated with a type II codebook and CSI associated with a type I codebook, the UE can identify the priorities for each type of CSI report and can process the CSI based on the identified priorities. In other examples, the UE can be configured with various parameters (e.g., CSI processing time, maximum rank) that relax or modify the processing of type II CSI reports. The UE can also report its ability to support a concurrent type I and type II codebook CSI reporting scheme, and the network can configure the UE based on the reported ability. In other cases, the configuration of CSI can be adjusted, where the UE can be configured with only wideband CSI reporting (where subband CSI may not be supported). The UE can perform simplified CSI reporting, which can result in reduced complexity and power consumption for UE processing, as well as other benefits.

[0065] Aspects of the present disclosure are first described in the context of a wireless communication system. Additional aspects of the present disclosure are described with reference to signaling schemes and processing diagrams. Aspects of the present disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for simplifying CSI feedback.

[0066] Figure 1 An example of a wireless communication system 100 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure is shown. The wireless communication system 100 can include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 can be a Long Term Evolution (LTE) network, an enhanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 can support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0067] Base stations 105 may be dispersed throughout a geographical area to form a wireless communication system 100, and may be devices having different forms or having different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 within which the UEs 115 and the base station 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographical area within which the base station 105 and the UEs 115 may support the transmission of signals according to one or more radio access technologies.

[0068] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices having different forms or having different capabilities. Some example UEs 115 are shown in Figure 1 . The UEs 115 described herein are capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), as Figure 1 shown in

[0069] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via the core network 130) or in both ways over the backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, the backhaul links 120 may be one or more wireless links or may include one or more wireless links.

[0070] One or more of the base stations 105 described herein may include or may be referred to by those of ordinary skill in the art as base station transceivers, radio base stations, access points, radio transceivers, Node Bs, evolved Node Bs (eNBs), next generation Node Bs, or Gigabit Node Bs (any of which may be referred to as gNBs), home Node Bs, home evolved Node Bs, or other suitable terms.

[0071] The UE 115 may include or may be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, where "device" may also be referred to as unit, station, terminal, or client, among other examples. The UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, the UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine type communication (MTC) device, among other examples, which may be implemented in various items such as appliances, or vehicles, meters, and other examples.

[0072] The UE 115 described herein is capable of communicating with various types of devices such as other UE 115s that may sometimes act as relays, as well as base station 105 and network devices including macro eNB or gNB, small cell eNB or gNB, or relay base stations, among other examples, as Figure 1 shown.

[0073] The UE 115 and the base station 105 may wirelessly communicate with each other via one or more communication links 125 over one or more carriers. The term "carrier" may refer to a collection of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion (e.g., bandwidth part (BWP)) of a radio frequency spectrum band that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating the operation of the carrier, user data, or other signaling. The wireless communication system 100 may use carrier aggregation or multi-carrier operation to support communication with the UE 115. According to a carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0074] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be placed according to a channel raster to be discovered by the UE 115. A carrier may operate in an independent mode where the UE 115 performs initial acquisition and connection via the carrier, or a carrier may operate in a non-independent mode where a different carrier (e.g., of the same or different radio access technologies) is used to anchor the connection.

[0075] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105 or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communication (e.g., in FDD mode) or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0076] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or the wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of determined bandwidths for a carrier of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communication system 100 (e.g., the base station 105, the UE 115, or both) may have a hardware configuration that supports communication on a specific carrier bandwidth or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a sub-band, a BWP) or all of the carrier bandwidth.

[0077] The signal waveform transmitted on a carrier can be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing an MCM technique, a resource element can be composed of a symbol period (e.g., the duration of a modulated symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element can depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate can be for the UE 115. Wireless communication resources can refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further increase the data rate or data integrity for communication with the UE 115.

[0078] One or more numerologies for a carrier can be supported, where a numerology can include a subcarrier spacing (Δf) and a cyclic prefix. A carrier can be divided into one or more BWPs with the same or different numerologies. In some examples, the UE 115 can be configured with multiple BWPs. In some examples, a single bandwidth part (BWP) for a carrier can be active at a given time, and communication for the UE 115 can be restricted to one or more active BWPs.

[0079] The time interval for the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, which can, for example, refer to T s = 1 / (Δf max ·N f ) seconds of sampling period, where Δf max can represent the maximum supported subcarrier spacing, and N f can represent the maximum supported discrete Fourier transform (DFT) size. The time interval of the communication resources can be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0080] Each frame may include a plurality of consecutively numbered sub - frames or time slots, and each sub - frame or time slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into sub - frames, and each sub - frame may be further divided into a plurality of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the sub - carrier spacing. Each time slot may include a plurality of symbol periods (e.g., depending on the length of the cyclic prefix appended to each symbol period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini - slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f

[0081]

[0082]

[0083] Physical channels may be multiplexed on a carrier according to various techniques. For example, one or more of time - division multiplexing (TDM) techniques, frequency - division multiplexing (FDM) techniques, or hybrid TDM - FDM techniques may be used to multiplex physical control channels and physical data channels on a downlink carrier. A control region for a physical control channel (e.g., a control resource set (CORESET)) may be defined by the number of symbol periods and may span the system bandwidth of the carrier or a subset of the system bandwidth. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more UEs among the UEs 115 may monitor or search for a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the encoded information for a control information format with a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE - specific search space set for sending control information to a specific UE 115.

[0083] Each base station 105 can provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells or any combination thereof). The term "cell" can refer to a logical communication entity for communication with the base station 105 (e.g., on a carrier), and can be associated with an identifier (e.g., physical cell identifier (PCID), virtual cell identifier (VCID), or others) used to distinguish adjacent cells. In some examples, a cell can also refer to a geographic coverage area 110 or a portion of the geographic coverage area 110 (e.g., a sector) over which the logical communication entity operates. The scope of such a cell can range from a relatively small area (e.g., a structure, a subset of a structure) to a relatively large area, depending on various factors such as the capabilities of the base station 105. For example, a cell can be or include a building, a subset of a building, or an external space between or overlapping with the geographic coverage areas 110, and other examples.

[0084] Macro cells typically cover a relatively large geographic area (e.g., with a radius of several kilometers) and can allow unrestricted access by UEs 115 having a service subscription with the network provider that supports the macro cell. In comparison with macro cells, small cells can be associated with lower-power base stations 105, and small cells can operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells can provide unrestricted access to UEs 115 having a service subscription with the network provider, or can provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a residence or office). The base station 105 can support one or more cells and can also support communication on one or more cells using one or more component carriers.

[0085] In some examples, a carrier can support multiple cells, and different cells can be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that can provide access for different types of devices.

[0086] In some examples, the base station 105 can be movable and thus provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, but different geographic coverage areas 110 can be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies can be supported by different base stations 105. The wireless communication system 100 can include, for example, a heterogeneous network in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0087] The wireless communication network 100 can support synchronous operation or asynchronous operation. For synchronous operation, the base stations 105 can have similar frame timings, and transmissions from different base stations 105 can be approximately aligned in time. For asynchronous operation, the base stations 105 can have different frame timings, and transmissions from different base stations 105 can be unaligned in time in some examples. The techniques described herein can be used for synchronous operation or asynchronous operation.

[0088] Some UEs 115 (such as MTC or IoT devices) can be low-cost or low-complexity devices, and can provide (e.g., via machine-to-machine (M2M) communication) automated communication between machines. M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with the base station 105 without human intervention. In some examples, M2M communication or MTC can include communication from devices that are integrated with sensors or meters to measure or capture information, and relay such information to a central server or application that utilizes the information or presents the information to a human interacting with an application. Some UEs 115 can be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, device monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business billing.

[0089] Some UEs 115 may be configured to operate in a power-reduced mode of operation, e.g., half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception rather than simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UEs 115 include entering a power-saving deep sleep mode when not participating in active communication, when operating on a limited bandwidth (e.g., according to narrowband communication), or when a combination of these techniques. For example, some UEs 115 may be configured for operation using a narrowband protocol type associated with a defined portion or extent (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of the carrier, or external to the carrier.

[0090] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. The UE 115 may be designed to support ultra-reliability, low latency, or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication and may be supported by one or more mission-critical services such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency may be used interchangeably herein.

[0091] In some examples, the UE 115 is also capable of directly communicating with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some examples, groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system where each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0092] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. Vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information related to the V2X system. In some examples, vehicles in a V2X system can communicate with roadside infrastructure (such as a roadside unit), or communicate with a network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or perform both operations.

[0093] The core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), which can include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) that manages access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) that routes packets to or interconnects with an external network. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for a UE 115 served by a base station 105 associated with the core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can be connected to a network operator IP service 150. The operator IP service 150 can include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0094] Some network devices in the network device (e.g., base station 105) can include subcomponents such as an access network entity 140, which can be an example of an access node controller (ANC). Each access network entity 140 can communicate with a UE 115 through one or more other access network transmission entities 145 (which can be referred to as a radio head, a smart radio head, or a transmit / receive point (TRP)). Each access network transmission entity 145 can include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 can be distributed across various network devices (e.g., radio head and ANC) or combined into a single network device (e.g., base station 105).

[0095] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or the decimeter band because the wavelength range is approximately from one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves can be sufficient to penetrate structures for a macro cell to serve a UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz, UHF wave transmissions can be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers).

[0096] The wireless communication system 100 can also operate in the super-high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz (also referred to as the centimeter band) or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as the millimeter band). In some examples, the wireless communication system 100 can support millimeter wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be even smaller and more closely spaced compared to UHF antennas. In some examples, this can facilitate the use of antenna arrays within the device. However, compared to SHF or UHF transmissions, EHF transmissions may suffer even greater atmospheric attenuation and shorter distances. The techniques disclosed herein can be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions can vary according to the country or regulatory body.

[0097] The wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ licensed-assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed frequency band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, devices (such as the base station 105 and the UE 115) can employ carrier sensing for collision detection and avoidance. In some examples, operation in an unlicensed frequency band can be based on a carrier aggregation configuration that combines component carriers operating in a licensed frequency band (e.g., LAA). Operations in the unlicensed spectrum can include downlink transmissions, uplink transmissions, peer-to-peer (P2P) transmissions, or device-to-device (D2D) transmissions, among other examples.

[0098] The base station 105 or the UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, MIMO communication, or beamforming. The antennas of the base station 105 or the UE 115 may be located within one or more antenna arrays or antenna panels (which may support MIMO operation or transmit or receive beamforming). For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communication with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0099] The base station 105 or the UE 115 may use MIMO communication to take advantage of multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such a technique may be referred to as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) (where multiple spatial layers are transmitted to the same receiving device) and MU-MIMO (where multiple spatial layers are transmitted to multiple devices).

[0100] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., base station 105, UE 115) to form or direct an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals transmitted via the antenna elements of an antenna array such that some signals propagating in a particular orientation relative to the antenna array undergo constructive interference while other signals undergo destructive interference. The adjustment of the signals transmitted via the antenna elements can include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustment associated with each antenna element in the antenna elements can be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0101] As part of the beamforming operation, the base station 105 or the UE 115 can use beam scanning techniques. For example, the base station 105 can use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. The base station 105 can transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, the base station 105 can transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions can be used (e.g., by the transmitting device such as the base station 105 or by the receiving device such as the UE 115) to identify the beam direction for subsequent transmissions or receptions performed by the base station 105.

[0102] The base station 105 can transmit some signals (e.g., data signals associated with that receiving device) in a single beam direction (e.g., the direction associated with a particular receiving device (e.g., UE 115)). In some examples, the beam direction associated with the transmission along a single beam direction can be determined based on the signals transmitted in one or more beam directions. For example, the UE 115 can receive one or more of the signals transmitted by the base station 105 in different directions and can report an indication to the base station 105 of the signal that has the highest signal quality or otherwise acceptable signal quality received by the UE 115.

[0103] In some examples, multiple beam directions may be used to perform transmissions by a device (e.g., by base station 105 or UE 115), and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from base station 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. Base station 105 may transmit reference signals (e.g., cell-specific reference signal (CRS), CSI-RS) that may or may not be precoded. UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify beam directions for subsequent transmissions or receptions by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0104] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105, a receiving device (e.g., UE 115) may attempt multiple reception configurations (e.g., directional listening). For example, the receiving device may receive by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (e.g., different sets of directional listening weights), or by processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (any of the above operations may be referred to as "listening" according to different reception configurations or reception directions), thereby attempting multiple reception directions. In some examples, the receiving device may use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). The single reception configuration may be aligned in a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

[0105] The wireless communication system 100 can be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly for transmission over logical channels. The medium access control (MAC) layer can perform priority handling and multiplexing of logical channels to transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration, and maintenance of an RRC connection (which supports radio bearers for user plane data) between the UE 115 and the base station 105 or the core network 130. At the physical layer, transport channels can be mapped to physical channels.

[0106] The UE 115 and the base station 105 can support retransmissions of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is correctly received over the communication link 125. HARQ can include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions). In some examples, a device can support same-slot HARQ feedback, where the device can provide HARQ feedback for data received in previous symbols in a particular slot in that slot. In other cases, the device can provide HARQ feedback in a subsequent slot or according to some other time interval.

[0107] The base station 105 can collect channel state information from the UE 115 to efficiently configure and schedule channels. This information can be sent from the UE 115 in the form of a channel state report (or CSI report). The channel state report can include: a rank indicator (RI) that requests the number of layers to be used for downlink transmission (e.g., based on the antenna ports of the UE 115); a precoding matrix indicator (PMI) that indicates a preference for which precoder matrix should be used (e.g., based on the number of layers); and a channel quality indicator (CQI) that represents the highest modulation and coding scheme (MCS) that can be used. The UE 115 can calculate the CQI after receiving a predetermined pilot symbol such as a cell-specific reference signal (CRS) or a CSI-RS.

[0108] In some examples, the type of information included in the CSI report determines the report type. The CSI can be periodic or aperiodic. Additionally, based on the codebook used to generate the report, the CSI report can have different types. For example, a type I CSI report can be based on a first codebook, while a type II CSI report can be based on a second codebook, where the first and second codebooks can be based on different antenna configurations. In some cases, using a type I or type II CSI report can improve MIMO performance (compared to other types of CSI reports). In some cases, the type II CSI report can be carried at least on the PUSCH, and the CSI can be provided to the base station 105 at a relatively high granularity level (e.g., for MU-MIMO services).

[0109] For CSI, there can be an active period defined by the time period (e.g., time slot) from the triggering DCI to the UE 115 sending the corresponding CSI report. As described herein, in the case of "non-concurrent" CSI reports, this means that when the type 2 CSI report is active, the UE 115 may not update the type I CSI report (alternatively, not update the type II CSI report when the type II CSI report is active), even if the type I and type II CSI reports are not triggered simultaneously. Here, the wireless communication system 100 can support time division multiplexing of CSI processing, where the UE 115 can first identify the type of the CSI report (e.g., this can be further based on the priority of the corresponding CSI report) before updating one or more CSI reports.

[0110] The wireless communication system 100 can support a simplified CSI feedback process. For example, the base station 105 can configure the UE 115 to have relaxed buffering requirements for aperiodic CSI reports. In such a case, the UE 115 can send a capability report indicating a time delay (e.g., triggering offset) to the base station 105. The base station 105 can configure the UE 115 to have one or more CSI resources. Additionally, the base station 105 can send DCI to trigger the CSI report to the UE 115. The UE 115 can perform the CSI report based on the CSI resources and the triggering offset. The triggering offset can allow the UE 115 time to decode the received DCI, thereby reducing the amount of signal buffering performed by the UE 115. In some examples, the UE 115 may have limited capabilities compared to other UEs 115 (e.g., the UE 115 can be a low-complexity UE 115, which can be referred to as an NR light UE 115). The UE 115 can be a wearable smart device, an industrial sensor, a video surveillance device, or any other device with reduced complexity.

[0111] In some cases, the DCI may trigger CSI reports associated with different codebook types (e.g., type I, type II). The CSI reports associated with different codebook types can be modified to reduce the computational burden on the UE 115. For example, the UE 115 can utilize priorities associated with different CSI codebook types. In some cases, when the UE 115 is triggered to report CSI associated with a type II codebook and CSI associated with a type I codebook, the UE 115 can identify the priorities for each type of CSI report and can process the CSI based on the identified priorities. In other examples, the UE 115 can be configured with various parameters (e.g., CSI processing time, maximum rank) that relax or modify the processing of type II CSI reports, where the corresponding parameters can correspond to reporting CSI for different codebook types.

[0112] Figure 2 FIG. shows an example of a wireless communication system 200 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100 and may include a UE 115-a and a base station 105-a with a coverage area 110-a, which may be examples of the UE 115 and base station 105 described with reference to Figure 1 For example, the UE 115-a and the base station 105-a may send and receive control information and data via a communication link 125-a during a signaling window 205. In some cases, the UE 115-a may have reduced capabilities relative to other UEs 115. For example, the UE 115-a can be a NR light UE 115, such as a wearable device, an industrial sensor, a video surveillance device, etc. Additionally, when compared to a traditional UE 115, the UE 115-a may have a reduced number of receive antennas, a reduced transmit or receive bandwidth (e.g., 5 MHz - 20 MHz compared to a 100 MHz bandwidth used for other UEs 115), a reduced computational complexity and memory, and an increased battery life requirement. As described herein, the base station 105-a can configure the UE 115-a according to a simplified CSI feedback process (e.g., to enhance coexistence between UEs 115 operating with different complexities).

[0113] For example, the base station 105-a may configure the UE 115-a to perform an aperiodic CSI report using one or more CSI resources 210 (e.g., resources carrying aperiodic CSI-RS). In some cases, the base station 105-a may dynamically indicate the CSI resources 210 that the UE 115-a may use to perform CSI measurements. For example, the base station 105-a may send control information, such as DCI 215, to the UE 115-a. The DCI 215 may trigger an aperiodic CSI report and may indicate the corresponding CSI resources 210 that the UE 115-a may use (e.g., one or more of CSI resources 210-a, 210-b, 210-c, 210-d, 210-e, 210-f, 210-g, or 210-h). In some cases, the UE 115-a may not know which CSI resources 210 to perform measurements on until after the DCI 215 triggers an aperiodic CSI report and indicates the configured resources to be used. Thus, the UE 115-a may buffer the received signaling during the signaling duration 220, which may include the configured CSI resources 210 received in the active BWP 225-a and the inactive BWP 225-b. However, buffering data in an immediate manner may result in high memory and sampling capability requirements for the UE 115-a.

[0114] In addition, it may be desirable for the UE 115-a to support CSI reporting using different types of codebooks (e.g., corresponding to the codebook capabilities for the UE 115-a). For example, the UE 115-a may support type I single-panel or type I multi-panel CSI feedback. In some cases, type I CSI feedback may include codebook-based precoding matrix indicator (PMI) feedback with relatively normal spatial resolution. Additionally or alternatively, the UE 115-a may support type II CSI feedback. Type II CSI feedback may be an enhanced feedback scheme that enables explicit feedback or codebook-based feedback with relatively high spatial resolution.

[0115] In some cases, UE 115-a may report codebook capabilities for a frequency band, including codebook types. For each codebook type, there may be one or more lists. Each list may include parameters indicating the codebook capabilities corresponding to the frequency band. In some examples, the parameters may include the maximum number of ports per CSI resource (maxNumberTxPortsPerResource), the maximum number of CSI resources per frequency band (maxNumberResourcesPerBand), and the total maximum number of ports per frequency band (totalNumberTxPortsPerBand). The base station 105-a may consider the reported capability parameters to configure CSI reporting for UE 115-a. In some cases, UE 115-a may be configured or triggered using multiple types of codebook-based CSI reporting and thus may support concurrent codebooks with a hybrid type. For example, UE 115-a may be triggered using type I single-panel or type I multi-panel and type II CSI types. Type II CSI may involve relatively more complex calculations compared to type I CSI calculations. In such an example, UE 115-a may under-report type II CSI codebook capabilities, and thus the base station 105-a may jointly consider one list for type I CSI and one list for type II CSI. That is, UE 115-a may under-report the maximum number of ports, the maximum number of CSI resources (e.g., 2 instead of 4), or the total maximum number of ports (e.g., 8 instead of 16) so as to concurrently support both CSI codebook types.

[0116] If the capabilities for type II CSI are under-reported (e.g., due to limited complexity at UE 115-a), the performance of type II CSI may be limited. For example, reducing the number of beamforming ports or resources for a frequency band may degrade the reporting granularity. In some cases, if UE 115-a supports the type II CSI codebook for CSI reporting, the base station 105-a may pair UE 115-a (which may be an NR light UE 115) with a UE 115 with higher complexity for MU-MIMO (e.g., an advanced UE 115). In such a case, under-reporting of type II CSI codebook capabilities at UE 115-a may result in higher interference between UE 115 and UE 115-a.

[0117] As described herein, the wireless communication system 200 may support techniques that relax the buffering capabilities or processing for type II CSI at UE 115-a while maintaining performance. For example, and as described with respect to Figure 3More specifically, UE115-a may be configured with a time delay or trigger offset (e.g., CSI measurement resource trigger offset), which may be the time between receiving DCI 215 that triggers an aperiodic CSI report and the start of the CSI resource 210 for the corresponding measurement. Thus, UE 115-a may not expect to receive any configured CSI-RS for the CSI report triggered by DCI 215 until after the trigger offset, thus allowing UE 115 time to decode the received DCI 211 and reducing the amount of buffering performed by UE 115-a. In other examples, the number of configured aperiodic CSI resources 210 for CSI measurement may be restricted, which may allow UE 115-a to buffer less data when decoding DCI 215 (e.g., due to a reduced number of resources including CSI-RS that can potentially be used for measurement). Additionally or alternatively, the configuration of CSI resource 210 may be based on the buffering capacity reported by UE 115-a (e.g., the size of its memory), and the buffering capacity may be reported in terms of the number of symbol periods for the received bandwidth.

[0118] In addition, CSI reporting using different CSI codebook types (e.g., type I, type II) may be modified to reduce the computational burden on UE 115-a. For example, and as described in further detail Figure 4A and 4B More specifically, UE 115-a may identify the type of CSI report (e.g., the type of CSI codebook), and further utilize the priorities associated with different CSI codebook types, where it may be expected that UE 115-a does not support concurrent CSI when at least type II CSI is triggered. In some cases, when UE 115-a is triggered to report CSI associated with a type II codebook and CSI associated with a type I codebook, UE 115-a may identify the priorities for each type of CSI report and may process the CSI based on the identified priorities. In other examples, UE 115-a may be configured with various parameters (e.g., CSI processing time, maximum rank) that relax or modify the processing of type II CSI reports. UE 115-a may also report its ability to support a concurrent type I and type II CSI codebook reporting scheme, and the base station 105 may configure UE 115-a based on the reported ability. In other cases, the configuration of CSI may be adjusted, where UE 115-a may be configured only for wideband CSI reporting (where subband CSI may not be supported). UE 115-a may perform a simplified CSI report, which may reduce the complexity and power consumption for UE processing, among other benefits.

[0119] Figure 3An example of a signaling scheme 300 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure is shown. In some examples, the signaling scheme 300 may implement aspects of the wireless communication system 100 and / or 200. For example, the signaling scheme 300 may show a BWP 325, where the UE 115 performs CSI measurements based on a configured time delay (e.g., trigger offset 305). The signaling scheme 300 includes a CSI resource 310, a trigger DCI 315, and a BWP 325, which may be corresponding examples of the CSI resource 210, the trigger DCI 215, and the BWP 225 as described with reference to Figure 2 In some examples, the base station 105 may configure the UE 115 (e.g., via RRC signaling) to have one or more aperiodic CSI resources 310 within one or more BWPs 325. For example, the UE 115 may be configured to have a CSI resource 310-a, a CSI resource 310-b, and a CSI resource 310-c.

[0120] In some cases, the UE 115 may identify a time delay (e.g., trigger offset 305) based on an indication from the base station 105, a predetermined value, or UE configuration. In some cases, the UE 115 may report the ability to indicate a minimum non-zero trigger offset 305. The trigger offset 305 may be a number of symbols or time slots, and the number may be based on the UE processing time for decoding the DCI 315. The trigger offset 305 may be the time between the triggering of the DCI 315 and the start of the aperiodic CSI resource 310 (e.g., the aperiodic CSI-RS resource associated with the aperiodic CSI report). In other cases, a slot offset may be added to the aperiodic CSI resource 310. For example, there may be a determined minimum number of time slots (e.g., one time slot) between the triggering of the DCI 315 and the start of the aperiodic CSI resource 310. Thus, the UE 115 may decode the triggering DCI 315 without buffering one or more CSI measurement resources (e.g., the aperiodic CSI resource 310). Once the UE 115 decodes the triggering DCI 315, the UE 115 may identify which aperiodic CSI resources 310 (e.g., CSI resource 310-b or CSI resource 310-c or both) are to be measured for the CSI report based on the information included in the triggering DCI 315. Thus, although the UE 115 may be configured with a set of aperiodic CSI resources 310 (e.g., across one or more BWPs 325), the UE 115 may identify a subset of the CSI resources 310 (e.g., CSI resource 310-b and / or CSI resource 310-c) to be measured for the triggered aperiodic CSI report after the trigger offset 305, while the UE 115 may not buffer other configured CSI measurement resources (e.g., CSI resource 310-a) within the trigger offset 305. Then, the UE 115 may measure the CSI resources 310 and report the CSI to the base station 105. The CSI report may include channel state information based on the measurements of the CSI resources 310-b and 310-c, and the channel state information may be used by the base station 105 to modify one or more transmission parameters.

[0121] In some cases, the base station 105 may indicate a number of configured aperiodic CSI resources 310 for CSI measurement based on UE capabilities. For example, the UE may indicate a threshold number of CSI measurement resources supported by the UE (e.g., the maximum number of aperiodic CSI resources 310). Indicating the number of configured aperiodic CSI resources 310 may reduce the buffering time for the UE 115. For example, if the UE 115 is configured with the maximum number of aperiodic CSI resources 310, the UE 115 may buffer fewer aperiodic CSI resources 310 (compared to the case where the maximum number of CSI measurement resources is not used). For example, the UE may expect to buffer no more than the maximum number of CSI measurement resources, which may reduce the total buffering time.

[0122] In some examples, the UE 115 may report capabilities associated with the buffer memory (e.g., memory size). For example, the UE 115 may report its memory size in a capability report, and the memory size may be indicated based on the number of symbols corresponding to the reception bandwidth (e.g., the maximum number of symbols). The base station 105 may calculate the buffering effort associated with the number of symbols and configure the UE 115 with CSI measurement resources according to the UE capabilities.

[0123] Figure 4A and 4B Examples of process diagrams 400-a and 400-b for a wireless communication system that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure are shown. In some examples, process diagrams 400-a and 400-b may implement aspects of the wireless communication system 100 and / or 200. For example, process diagrams 400-a and 400-b may each illustrate the process by which the UE 115 applies a codebook type to CSI feedback. Process diagrams 400-a and 400-b include a triggering DCI 415, which may be an example of the triggering DCI 215 and 315 respectively referenced Figure 2 and 3 described.

[0124] In some cases, the UE 115 may receive a triggering DCI 415 from the base station 105. The triggering DCI 415 may trigger a type I CSI report 405 or a type II CSI report 410, which may be referenced Figure 2Examples of the described Type I CSI reports and Type II CSI reports. In some aspects, the UE 115 may be configured to have a larger CSI processing time (e.g., if the UE 115 is an NR light UE 115). For example, for a low-complexity UE 115, the values of Z2 and Z′2 associated with the Type II CSI report may be increased (e.g., compared to Z2 and Z′2 associated with the Type I CSI report). Here, Z2 and Z′2 may refer to the time-domain duration (e.g., starting from when the UE 115 is configured or triggered with a CSI report until when the UE 115 measures (e.g., Z2) or reports a CSI resource (e.g., Z′2)).

[0125] In other cases, the UE 115 may not support concurrent Type II CSI reports 410 and Type I CSI reports 405 (e.g., Type I single panel, Type I multi-panel, or other codebook types). In such cases, the Type I CSI reports 405 and the Type II CSI reports 410 may be processed according to TDM techniques. As shown with respect to Figure 4A shown, the UE 115 may receive a trigger DCI 415-a, which may trigger at least the Type II CSI report 410. For example, the trigger DCI 415-a may trigger a Type I CSI report 405-a and a Type II CSI report 410-a. In such cases, the UE 115 may identify which CSI report to process based on the number of CSI processing units (CPUs) 420 available for processing each type of CSI (e.g., CPUs 420-a, 420-b, 420-c, and 420-d). In such cases, as shown, the Type II CSI report 410-a may have a higher priority compared to the Type I CSI report 405-a, and the UE 115 may occupy each of the CPUs 420 (e.g., CPUs 420-a to 420-d) when updating the Type II CSI report 410-a. Once the CPUs 420-a, 420-b, 420-c, and 420-d are full, the UE 115 may not update the Type I report to the CPUs 420, as shown at 425, because no more CPUs are available.

[0126] In another example, referring to Figure 4B, the Type I CSI report 405-b can have a higher priority compared to the Type II CSI report 410-b, and a portion (e.g., a subset) of the CPU 420 can be occupied by the Type I CSI report 405. As an illustrative example, when generating the Type I CSI report 405-b, the Type I CSI report 405-b can occupy CPU 420-e and CPU 420-f (but not CPU 420-g and / or CPU 420-h). In such a case, if the Type I CSI report 405-b and the Type II CSI report 410-b are triggered concurrently, the UE 115 may not update the Type II CSI report 410-b (e.g., as shown at 430), because there may not be enough CPU 420 available to update the Type II CSI report 410-b concurrently (e.g., because in one example, the Type II CSI report can utilize four CPUs, and two of the four CPUs are being used to generate the Type I CSI report). In such a case, since an insufficient number of CPUs are available, the Type II CSI report 410-b may not be updated concurrently and can be updated at a later time (e.g., according to TDM processing techniques), or the update of the Type II CSI report 410-b can be skipped.

[0127] In some examples, the rank for the Type II CSI report 410 can be restricted (e.g., restricted to the value 1), regardless of the number of receive antennas used and the rank for other codebook types. Thus, RI may not be reported for the Type II CSI report 410, thereby reducing the complexity of the Type II CSI report 410. The RI for the Type I CSI report 405 can be based on the configured maximum MIMO layer. In other examples, the Type II CSI report 410 can be restricted for use in non-periodic CSI reporting using non-periodic CSI resources (e.g., non-periodic CSI-RS resources). For example, the UE 115 may not support the Type II CSI report 410 for periodic or semi-persistent CSI resources (e.g., so the UE may not calculate the Type II CSI report 410 for any periodic or semi-persistent CSI resources (if some non-periodic CSI reports are triggered)).

[0128] In some cases, the UE 115 may report concurrent codebook capabilities for type I CSI report 405 and type II CSI report 410. For example, CSI measurement resources for both type I CSI report 405 and type II CSI report 410 may be measured and calculated at the UE 115. The UE 115 may report the codebook capabilities separately (e.g., regardless of whether the UE is configured with type I CSI report 405, type II CSI report 410, or a hybrid type CSI). For example, the UE 115 may report different lists (supportedCSI-RS-ResourceLists) for type II CSI reports, type I CSI reports, concurrent type I and type II CSI reports, or combinations thereof. In other cases, for type II CSI report 410, the UE 115 may support wideband CSI reporting (e.g., does not support subband type II CSI reporting).

[0129] Figure 5 An example of a process flow 500 in a system supporting techniques for simplified CSI feedback in accordance with aspects of the present disclosure is shown. In some examples, the process flow 500 may implement aspects of the wireless communication systems 100 and 200. For example, the process flow 500 includes a UE 115-b and a base station 105-b, which may be examples of the corresponding devices referenced Figure 1 and Figure 2 and described. In some cases, the UE 115-b may be a UE 115 with reduced capabilities (e.g., fewer antennas, reduced computational complexity, reduced operating bandwidth, etc.) compared to other UEs 115. The process flow 500 may illustrate various techniques that relax the buffering requirements of the UE 115, thereby enhancing the CSI feedback process performed by the UE 115.

[0130] At 505, the UE 115-b may send a capabilities report, and the base station 105-b may receive the capabilities report, the capabilities report indicating an aperiodic CSI measurement resource triggering offset supported by the UE 115-b. For example, the CSI measurement resource triggering offset may be a non-zero time between when a DCI (e.g., the DCI triggering an aperiodic CSI report) is received and when a first CSI measurement resource is received. In some cases, the UE 115-b may include in the capabilities report an indication of a minimum amount of time (e.g., number of symbol periods) corresponding to the CSI measurement resource triggering offset. In some cases, the CSI measurement resource triggering offset supported by the UE 115-b may be based on the processing time for DCI decoding by the UE 115-b. In other cases, the CSI measurement resource triggering offset may represent a slot time offset added to the aperiodic CSI reporting procedure, where a number of slot time intervals (e.g., one or two slots) may be added between receiving the triggering DCI and the aperiodic CSI measurement resource (e.g., CSI-RS). In some cases, the capabilities report may be the per-band codebook capabilities of the UE 115-b.

[0131] Additionally or alternatively, the UE 115-b may send, within the capabilities report, a threshold (e.g., maximum) number of aperiodic CSI measurement resources associated with the CSI reports that the UE 115-b is capable of measuring. In such cases, the maximum number of aperiodic CSI measurement resources may be based on the number of components that the UE 115-b is configured to have for processing CSI, or may be related to other capabilities of the UE 115-b. In other examples, the UE 115-b may include in the capabilities report an indication of the buffer memory size or other similar capabilities of the UE.

[0132] At 510, the base station 105-b may identify, based on the received capabilities report, the threshold number of aperiodic CSI measurement resources, the UE memory size associated with buffering aperiodic CSI measurement resources, and combinations thereof.

[0133] At 515, the base station 105-b may configure aperiodic CSI measurement resources for CSI measurements to be performed by the UE 115-b. For example, the configuration may be based on an aperiodic CSI measurement resource trigger offset, wherein one or more CSI measurement resources may not be configured for transmission until after the aperiodic CSI measurement resource trigger offset (e.g., starting when a triggering DCI is sent). Here, the UE 115-b may expect not to measure the aperiodic CSI measurement resources until after the aperiodic CSI measurement resource trigger offset. More generally, the base station 105-b may configure the aperiodic CSI resources based on information included in the capability report. For example, the base station 105-b may configure one or more aperiodic CSI measurement resources based on a buffer memory size, a minimum aperiodic CSI measurement resource, a DCI decoding time supported by the UE 115-b, a maximum number of CSI resources supported by the UE 115-b, and the like.

[0134] At 520, the base station 105-b may send a configuration of one or more aperiodic CSI measurement resources, and the UE 115-b may receive the configuration. At 525, the base station 105-b may send a DCI, and the UE 115-b may receive the DCI, which triggers a CSI report for a first subset of the one or more aperiodic CSI measurement resources. The DCI may be based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset.

[0135] At 530, UE 115-b may generate a CSI report based on the received configuration of one or more CSI measurement resources. For example, UE 115-b may identify a first subset of CSI-RS resources and perform measurements on the CSI-RS resources to obtain various information for the CSI report.

[0136] At 535 , the UE 115 - b may send a CSI report, and the base station 115 - b may receive the CSI report, the CSI report indicating measurements on the first subset of non-periodic CSI measurement resources.

[0137] Figure 6 An example of a process flow 600 in a system supporting techniques for simplifying CSI feedback according to aspects of the present disclosure is shown. In some examples, the process flow 600 can implement aspects of the wireless communication systems 100 and 200. For example, the process flow 600 includes a base station 105-c and a UE 115-c, each of which can be a reference Figure 1 , Figure 2 and Figure 5An example of the corresponding device described. Note that UE 115-c and base station 105-c may perform aspects of the functions described in reference process flow 500 and / or process flow 700, as described herein. Thus, although omitted for brevity from Figure 6 the additional or alternative functions other than those shown in process flow 600, such as transmitting a capability report, configuring CSI-RS resources based on UE capabilities, etc., may be performed by UE 115-c and base station 105-c. Process flow 600 may illustrate an example of a technique for relaxing the processing time of CSI reports (e.g., type II CSI reports) performed by UE 115-c while maintaining the performance of such reports (e.g., for reducing interference among UEs 115).

[0138] At 605, base station 105-c may transmit a configuration of one or more aperiodic CSI measurement resources (e.g., including CSI-RS), and UE 115-c may receive the configuration. At 610, base station 105-c may transmit DCI, and UE 115-c may receive the DCI that triggers a first CSI report (e.g., type II CSI report) associated with a first type of codebook and a second CSI report (e.g., type II CSI report) associated with a second type of codebook.

[0139] At 615, UE 115-c may generate one of the first CSI report or the second CSI report using a set of one or more CSI processing units based on the first type of codebook and the second type of codebook. In such a case, each CSI processing unit in the set of one or more CSI processing units may be used to process the first CSI report based on the first type of codebook. Further, a subset of the CSI processing units of the set of one or more CSI processing units may be used to process the second CSI report based on the second type of codebook. In other words, type II CSI reports may occupy all of the CSI processing units of UE 115-c, while type I CSI reports may occupy less than all of the CSI processing units of UE 115-c. In such a case, UE 115-b may determine not to update one CSI report or the other based on the type of the identified codebook.

[0140] At 620, the UE 115-c may identify a priority for the first and second CSI reports. As an example, the UE 115-c may first consider the codebook type before checking the CSI priority rules for updating and processing the CSI. In such a case, the UE 115-c may identify that the first CSI report (e.g., a type II CSI report) has a higher priority than the second CSI report (e.g., a type I CSI report). The UE 115-c may then generate the first CSI report based on using each CSI processing unit in a set of one or more CSI processing units, thereby avoiding updating the second CSI report. That is, since all CSI processing units of the UE 115-c may be occupied by the type II CSI report, the UE 115-c may not update the type ICSI report, for example, until a later time when the CSI processing units are not occupied or available.

[0141] Alternatively, the UE 115-c may identify that the second CSI report has a higher priority than the first CSI report, and the UE 115-c may generate the second CSI report based on using a subset of CSI processing units in the set of one or more CSI processing units, thereby avoiding updating the first CSI report. Because some of the CSI processing units of the UE 115-c may be occupied for processing the type I CSI report, there may not be enough CSI processing units available for processing the type II CSI report (e.g., until a later time). Therefore, the UE 115-c may determine not to update the type II CSI report.

[0142] At 625, the UE 115-c may send the generated CSI report, and the base station 105-c may receive the generated CSI report.

[0143] Figure 7 An example of a process flow 700 in a system supporting techniques for simplifying CSI feedback according to aspects of the present disclosure is shown. In some examples, the process 700 can implement aspects of the wireless communication systems 100 and 200. For example, the process flow 700 includes a base station 105-d and a UE 115-d, each of which can be a reference Figure 1 , Figure 2 and Figure 5An example of the corresponding device described. Note that UE 115-d and base station 105-d may perform aspects of the functions described in reference process flow 500 and / or process flow 600, as described herein. Thus, although omitted from flow 700 for brevity, process flow 600 may include additional or alternative features compared to the features shown, such as configuring CSI measurement resources, etc. Process flow 700 may illustrate an example of a technique for relaxing the processing time of CSI reports (e.g., type II CSI reports) performed by UE 115-d while maintaining the performance of such reports (e.g., for reducing interference between UEs 115).

[0144] At 705, UE 115-d may send a capability report, and base station 105-d may receive the capability report, the capability report indicating one or more capabilities of UE 115-d. For example, UE 115-d may send a capability report that includes a first capability indication for the ability to concurrently generate a first CSI report and a second CSI report, a second capability indication for the ability to separately generate the first CSI report, a third capability indication for the ability to separately generate the second CSI report, or a combination thereof.

[0145] In some cases, at 710, base station 105-d may configure different parameter sets for respective CSI reports using different types of codebooks. For example, base station 105-d may configure a first parameter set for a first CSI report associated with a first type of codebook (e.g., type II codebook), and a second parameter set for a second CSI report associated with a second type of codebook (e.g., type I single-panel or type I multi-panel codebook). In some cases, the configuration of the first and second parameter sets may be based on the capability report received from UE 115-d. For example, base station 105-d may configure the maximum rank value for a type II CSI report, or base station 105-d may limit the type II CSI report to only aperiodic CSI resources. In another example, the type II CSI report may be configured to be limited to wideband reporting (and may not be configured for sub-band reporting).

[0146] In any case, at 715, base station 105-d may send a configuration of one or more aperiodic CSI measurement resources, and UE 115-d may receive the configuration. The configuration may include an indication of the first parameter set and the second parameter set.

[0147] At 720, the base station 105-d may send DCI, and the UE 115-d may receive the DCI, which triggers a first CSI report associated with a first type of codebook (e.g., a type II CSI report), or a second CSI report associated with a second type of codebook (e.g., a type I CSI report).

[0148] At 725, the UE 115-d may optionally identify, from a first parameter set, a first set of CSI calculation times associated with the first CSI report (e.g., Z2 and Z’2 for type II CSI as described herein), where the first set of CSI calculation times is different from a second set of CSI calculation times associated with the second CSI report. Further, the UE 115-d may identify, from a second parameter set, a second set of CSI calculation times associated with the second CSI report (e.g., Z2 and Z’2 for type I CSI as described herein). Here, the second set of CSI calculation times may be different from the first set of CSI calculation times associated with the type II CSI report (e.g., having a shorter duration compared thereto).

[0149] Additionally or alternatively, at 730, the UE 115-d may identify a rank threshold value associated with the first CSI report based on the first parameter set. In other examples, at 735, the UE 115-d may optionally identify, based on the first parameter set, a first set of one or more aperiodic CSI measurement resources, where the first set of one or more aperiodic CSI measurement resources is configured for aperiodic CSI reporting.

[0150] At 740, the UE 115-d may generate the first CSI report using the first parameter set and the first type of codebook, or generate the second CSI report using the second parameter set and the second type of codebook, or a combination thereof. As described herein, the generated CSI report may be based on the received DCI.

[0151] At 745, the UE 115-d may send the first CSI report (e.g., a type II CSI report) or the second CSI report (e.g., a type I CSI report) or both to the base station 105-d. In such a case, the UE 115-d may send the first CSI report based on the first set of CSI calculation times, or send the second channel state information report based on the second set of CSI calculation times, or a combination thereof. In some cases, the first CSI report that does not include a rank indicator may be sent based on the rank threshold value. In some examples, the first CSI report includes a broadband CSI report.

[0152] Figure 8FIG. 800 is a schematic diagram showing an apparatus 805 that supports techniques for facilitating CSI feedback in accordance with aspects of the present disclosure. The apparatus 805 may be an example of aspects of a UE 115 as described herein. The apparatus 805 may include a receiver 810, a communication manager 815, and a transmitter 820. The apparatus 805 may also include a processor. Each of these components may communicate with one another (e.g., via one or more buses).

[0153] The receiver 810 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for facilitating CSI feedback, etc.). The information may be passed to other components of the apparatus 805. The receiver 810 may be an example of aspects of the transceiver 1120 described in Figure 11 reference. The receiver 810 may utilize a single antenna or a set of antennas.

[0154] The communication manager 815 may perform the following operations: send a capability report indicating the ability of the UE to support an aperiodic CSI measurement resource triggering offset to a base station; receive a configuration of one or more aperiodic CSI measurement resources; receive a DCI that triggers a CSI report for a first subset of aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources, the DCI being based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource triggering offset; and send a CSI report indicating measurements of the first subset of aperiodic CSI measurement resources to the base station.

[0155] The communication manager 815 may also perform the following operations: receive a DCI from the base station that triggers a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; generate one of the first CSI report or the second CSI report using a set of one or more CSI processing units based on the first type of codebook and the second type of codebook, wherein the first CSI report is processed using each CSI processing unit in the set of one or more CSI processing units based on the first type of codebook, or wherein the second CSI report is processed using a subset of the CSI processing units in the set of one or more CSI processing units based on the second type of codebook, or a combination thereof; and send the generated CSI report.

[0156] In some examples, the communication manager 815 may also perform the following operations: receive DCI that triggers a first CSI report associated with a first type of codebook, a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; based on the received DCI, generate a first CSI report using a first set of parameters and the first type of codebook, or generate a second CSI report using a second set of parameters and the second type of codebook, or a combination thereof; and transmit the first CSI report, the second CSI report, or a combination thereof. The communication manager 815 may be an example of aspects of the communication manager 1110 described herein.

[0157] The communication manager 815 or its subcomponents may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 815 or its subcomponents may be executed by a general-purpose processor, a DSP, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

[0158] The communication manager 815 or its subcomponents may physically be located in various locations, including being distributed such that some of the functions are implemented by one or more physical components in different physical locations. In some examples, the communication manager 815 or its subcomponents may be separate and distinct components in accordance with various aspects of this disclosure. In some examples, the communication manager 815 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or a combination thereof, in accordance with various aspects of this disclosure.

[0159] The transmitter 820 may transmit signals generated by other components of the device 805. In some examples, the transmitter 820 may be collocated with the receiver 810 in a transceiver module. For example, the transmitter 820 may be an example of aspects of the transceiver 1120 described with reference to Figure 11 The transmitter 820 may utilize a single antenna or a set of antennas.

[0160] Figure 9FIG. 900 is a schematic diagram showing an apparatus 905 that supports techniques for facilitating CSI feedback in accordance with aspects of the present disclosure. The apparatus 905 may be an example of aspects of apparatus 805 or UE 115 as described herein. The apparatus 905 may include a receiver 910, a communication manager 915, and a transmitter 940. The apparatus 905 may also include a processor. Each of these components may communicate with one another (e.g., via one or more buses).

[0161] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for facilitating CSI feedback, etc.). The information may be passed to other components of the apparatus 905. The receiver 910 may be an example of aspects of the transceiver 1120 described with reference to Figure 11 FIG. 11. The receiver 910 may utilize a single antenna or a set of antennas.

[0162] The communication manager 915 may be an example of aspects of the communication manager 815 described herein. The communication manager 915 may include a UE capabilities component 920, a CSI manager 925, a CSI transmission component 930, and a CSI generation component 935. The communication manager 915 may be an example of aspects of the communication manager 1110 described herein.

[0163] The actions performed by the communication manager 915 as described herein may be implemented to achieve one or more potential advantages. One implementation may enable a UE to report capabilities to a base station. Such reporting may enable techniques for facilitating CSI feedback by using a triggering offset or modifying CSI reports based on different codebook types, which may result in improved UE complexity and more efficient communication (e.g., reduced latency in the system) and other advantages.

[0164] Based on the implementation of the reporting as described herein, a processor of the UE or the base station (e.g., a processor that controls the receiver 910, the communication manager 915, the transmitter 940, or a combination thereof) may reduce the complexity of the CSI feedback process while ensuring relatively efficient communication. For example, the reporting techniques described herein may utilize a time delay or a CSI report codebook type during a time slot format determination process, which may enable reduced signaling overhead and power savings and other benefits.

[0165] The UE capability component 920 may send a capability report indicating the non-periodic CSI measurement resource trigger offset supported by the UE to the base station. The CSI manager 925 may receive the configuration of one or more non-periodic CSI measurement resources, and receive DCI that triggers a CSI report for a first subset of non-periodic CSI measurement resources among the one or more non-periodic CSI measurement resources. The DCI is based on the configuration of the one or more non-periodic CSI measurement resources and the non-periodic CSI measurement resource trigger offset.

[0166] The CSI manager 925 may receive DCI from the base station. The DCI triggers a first CSI report associated with a first type of codebook (e.g., type I CSI) and a second CSI report associated with a second type of codebook different from the first type of codebook (e.g., type II CSI). In some examples, the CSI manager 925 may receive DCI that triggers a first CSI report associated with a first type of codebook, or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof.

[0167] The CSI transmission component 930 may send a CSI report indicating measurements of the first subset of non-periodic CSI measurement resources to the base station. In some examples, the CSI transmission component 930 may send the generated CSI report. Additionally or alternatively, the CSI transmission component 930 may send the first CSI report, or the second CSI report, or a combination thereof.

[0168] The CSI generation component 935 may generate one of the first CSI report or the second CSI report based on the first type of codebook and the second type of codebook, using a set of one or more CSI processing units. The first CSI report is processed based on the first type of codebook using each CSI processing unit in the set of one or more CSI processing units, or the second CSI report is processed based on the second type of codebook using a subset of the CSI processing units in the set of one or more CSI processing units, or a combination thereof. In some cases, the CSI generation component 935 may generate the first CSI report based on the received DCI, using a first set of parameters and the first type of codebook, or generate the second CSI report using a second set of parameters and the second type of codebook, or a combination thereof.

[0169] The transmitter 940 may send signals generated by other components of the device 905. In some examples, the transmitter 940 may be collocated with the receiver 910 in a transceiver module. For example, the transmitter 940 may be an example of aspects of the transceiver 1120 described with reference to Figure 11 The transmitter 940 may utilize a single antenna or a set of antennas.

[0170] Figure 10 FIG. 1000 shows a schematic diagram 1000 of a communication manager 1005 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. The communication manager 1005 may be an example of aspects of the communication manager 815, the communication manager 915, or the communication manager 1110 described herein. The communication manager 1005 may include a UE capability component 1010, a CSI manager 1015, a CSI transmission component 1020, a CSI generation component 1025, a priority manager 1030, a parameter component 1035, and a rank component 1040. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0171] The UE capability component 1010 may send a capability report to a base station indicating the UE's support for an aperiodic CSI measurement resource trigger offset. In some examples, the UE capability component 1010 may send a capability report indicating an aperiodic CSI measurement resource trigger offset, which is a threshold duration after receiving DCI within which the UE can receive one or more aperiodic CSI measurement resources.

[0172] In some examples, the UE capability component 1010 may send a capability report indicating an aperiodic CSI measurement resource trigger offset that indicates the processing time for decoding DCI supported by the UE. In some examples, the UE capability component 1010 may send a capability report that indicates the threshold number of aperiodic CSI measurement resources associated with CSI reporting that the UE is capable of measuring, where the CSI report includes measurements for at least one of one or more aperiodic CSI measurement resources up to the threshold number of aperiodic CSI measurement resources.

[0173] In some examples, the UE capability component 1010 may send a capability report including an indication of the buffer memory size, wherein the configuration of one or more aperiodic CSI measurement resources is based on the buffer memory size. In some examples, the UE capability component 1010 may send a capability report that includes a first capability indication of the UE's capability for concurrently generating a first CSI report and a second CSI report, a second capability indication for separately generating the first CSI report, a third capability indication for separately generating the second CSI report, or a combination thereof. In some cases, the aperiodic CSI measurement resource trigger offset indicates one or more symbol periods, one or more slot durations, or a combination thereof. In some cases, the threshold number of aperiodic CSI measurement resources indicates the maximum number of aperiodic CSI measurement resources associated with a CSI report that the UE is capable of measuring. In some cases, the CSI report includes an aperiodic CSI report.

[0174] The CSI manager 1015 may receive the configuration of one or more aperiodic CSI measurement resources. In some examples, the CSI manager 1015 may receive DCI that triggers a CSI report for a first subset of aperiodic CSI measurement resources among one or more aperiodic CSI measurement resources, where the DCI is based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset. In some examples, the CSI manager 1015 may receive DCI from a base station that triggers a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook.

[0175] Additionally or alternatively, the CSI manager 1015 may receive DCI that triggers a first CSI report associated with a first type of codebook or a second CSI report associated with a second type of codebook different from the first type of codebook or a combination thereof. In some examples, the CSI manager 1015 may avoid updating the second CSI report based on generating the first CSI report using each CSI processing unit in a set of one or more CSI processing units, where transmitting the generated CSI report includes transmitting the first CSI report.

[0176] In some examples, the CSI manager 1015 may avoid updating the first CSI report based on generating a second CSI report using a subset of CSI processing units in a set of one or more CSI processing units, wherein transmitting the generated CSI report includes transmitting the second CSI report. In some examples, the CSI manager 1015 may identify a first set of one or more aperiodic CSI measurement resources based on a first set of parameters, the first set of one or more aperiodic CSI measurement resources being configured for aperiodic CSI reporting. In some cases, the first type of codebook includes a type II CSI codebook. In some cases, the first CSI report includes a wideband CSI report.

[0177] The CSI transmission component 1020 may send a CSI report indicating measurements of a first subset of aperiodic CSI measurement resources to a base station. In some examples, the CSI transmission component 1020 may send the generated CSI report. Additionally or alternatively, the CSI transmission component 1020 may send the first CSI report or the second CSI report or a combination thereof. In some examples, the CSI transmission component 1020 may send a first CSI report generated based on measurements of one or more aperiodic CSI measurement resources.

[0178] In some examples, the CSI transmission component 1020 may send the first CSI report based on a first set of CSI calculation times. In some examples, the CSI transmission component 1020 may send the second CSI report at least in part based on a second set of CSI calculation times. In some cases, the CSI transmission component 1020 may send a first CSI report that does not include a rank indicator based on a rank threshold value.

[0179] The CSI generation component 1025 may generate one of the first CSI report or the second CSI report using a set of one or more CSI processing units based on a first type of codebook and a second type of codebook, wherein the first CSI report is processed using each CSI processing unit in the set of one or more CSI processing units based on the first type of codebook, or wherein the second CSI report is processed using a subset of CSI processing units in the set of one or more CSI processing units based on the second type of codebook, or a combination thereof.

[0180] In some examples, the CSI generation component 1025 may generate the first CSI report based on the received DCI using the first set of parameters and the first type of codebook, or generate the second CSI report using the second set of parameters and the second type of codebook, or a combination thereof.

[0181] The priority manager 1030 can identify that the first CSI report has a higher priority than the second CSI report. In some examples, the priority manager 1030 can identify that the second CSI report has a higher priority compared to the first CSI report.

[0182] The parameter component 1035 can identify, from a first parameter set, a first set of CSI calculation times associated with the first CSI report, where the first set of CSI calculation times is different from a second set of CSI calculation times associated with the second CSI report. In some examples, the parameter component 1035 can identify, from a second parameter set, a second set of CSI calculation times associated with the second CSI report, where the second set of CSI calculation times is different from the first set of CSI calculation times associated with the first CSI report.

[0183] In some examples, the parameter component 1035 can receive an indication of the first parameter set and the second parameter set from a base station. In some cases, at least a portion of the first parameter set is different from the second parameter set. The rank component 1040 can identify a rank threshold value associated with the first CSI report based on the first parameter set.

[0184] Figure 11 FIG. shows a schematic diagram of a system 1100 including a device 1105 that supports techniques for simplified CSI feedback, in accordance with aspects of the present disclosure. The device 1105 can be an example of or include components of the device 805, the device 905, or the UE 115 as described herein. The device 1105 can include components for two-way voice and data communication, which include components for sending and receiving communications, including a communication manager 1110, an I / O controller 1115, a transceiver 1120, an antenna 1125, a memory 1130, and a processor 1140. These components can communicate electronically via one or more buses (e.g., bus 1145).

[0185] The communication manager 1110 can perform the following operations: send to a base station a capability report indicating the ability of the UE to support an aperiodic CSI measurement resource triggering offset; receive a configuration of one or more aperiodic CSI measurement resources; receive DCI that triggers a CSI report for a first subset of aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources, where the DCI is based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource triggering offset; and send to the base station a CSI report indicating measurements of the first subset of aperiodic CSI measurement resources.

[0186] The communication manager 1110 may also perform the following operations: receive DCI from a base station, where the DCI triggers a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook; based on the first type of codebook (e.g., type I codebook) and the second type of codebook (e.g., type II codebook), use a set of one or more CSI processing units to generate one of the first CSI report or the second CSI report, where the first CSI report is processed based on the first type of codebook using each CSI processing unit in the set of one or more CSI processing units, or where the second CSI report is processed based on the second type of codebook using a subset of the CSI processing units in the set of one or more CSI processing units, or a combination thereof; and transmit the generated CSI report.

[0187] In some examples, the communication manager 1110 may also perform the following operations: receive DCI that triggers a first CSI report associated with a first type of codebook or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof; based on the received DCI, use a first set of parameters and the first type of codebook to generate the first CSI report, or use a second set of parameters and the second type of codebook to generate the second CSI report, or a combination thereof; and transmit the first CSI report or the second CSI report, or a combination thereof.

[0188] The I / O controller 1115 may manage input and output signals for the device 1105. The I / O controller 1115 may also manage peripheral devices not integrated into the device 1105. In some cases, the I / O controller 1115 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 1115 may utilize an operating system such as or another known operating system. In other cases, the I / O controller 1115 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, the I / O controller 1115 may be implemented as part of a processor. In some cases, a user may interact with the device 1105 via the I / O controller 1115 or via hardware components controlled by the I / O controller 1115.

[0189] The transceiver 1120 can communicate bidirectionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 1120 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1120 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and for demodulating packets received from the antenna. In some cases, the wireless device can include a single antenna 1125. However, in some cases, the device can have more than one antenna 1125 capable of concurrently transmitting or receiving multiple wireless transmissions.

[0190] The memory 1130 can include random access memory (RAM) and read only memory (ROM). The memory 1130 can store computer-readable, computer-executable code 1135 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, additionally, the memory 1130 can contain a basic input / output system (BIOS) that can control basic hardware or software operations such as interactions with peripheral components or devices.

[0191] The processor 1140 can include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor 1140 can be configured to operate a memory array using a memory controller. In other cases, the memory controller can be integrated into the processor 1140. The processor 1140 can be configured to execute computer-readable instructions stored in a memory (e.g., memory 1130) to cause the device 1105 to perform various functions (e.g., functions or tasks supporting techniques for simplifying CSI feedback).

[0192] The code 1135 can include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communication. The code 1135 can be stored in a non-transitory computer-readable medium such as system memory or other types of memory. In some cases, the code 1135 may not be directly executable by the processor 1140 but can cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0193] Figure 12FIG. 1200 shows a schematic diagram of device 1205 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. Device 1205 may be an example of aspects of base station 105 as described herein. Device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1220. Device 1205 may also include a processor. Each of these components may communicate with one another (e.g., via one or more buses).

[0194] The receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, information related to techniques for simplifying CSI feedback, etc.). The information may be passed to other components of device 1205. The receiver 1210 may be an example of aspects of transceiver 1520 described with reference to Figure 15 The receiver 1210 may utilize a single antenna or a set of antennas.

[0195] The communication manager 1215 may perform the following operations: receive a capability report from a UE that includes an indication of CSI reporting capabilities supported by the UE; identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof based on the received capability report; send a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration being based on the threshold number of aperiodic CSI measurement resources or the UE memory size or a combination thereof; and send DCI to the UE that triggers a CSI report for a subset of aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources.

[0196] The communication manager 1215 may also perform the following operations: configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook; send DCI to the UE that triggers the first CSI report or the second CSI report or a combination thereof; and receive from the UE the first CSI report or the second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof. The communication manager 1215 may be an example of aspects of communication manager 1510 described herein.

[0197] The communication manager 1215 or its sub-components may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1215 or its sub-components may be performed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC), an FPGA, or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is designed to perform the functions described in this disclosure.

[0198] The communication manager 1215 or its sub-components may be physically located at various locations, including being distributed such that some of the functions are implemented by one or more physical components at different physical locations. In some examples, the communication manager 1215 or its sub-components may be separate and distinct components in accordance with various aspects of this disclosure. In some examples, the communication manager 1215 or its sub-components may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof, in accordance with various aspects of this disclosure.

[0199] The transmitter 1220 may send signals generated by other components of the device 1205. In some examples, the transmitter 1220 may be co-located with the receiver 1210 in a transceiver module. For example, the transmitter 1220 may be an example of aspects of the transceiver 1520 described with reference to Figure 15 The transmitter 1220 may utilize a single antenna or a set of antennas.

[0200] Figure 13 FIG. 1300 is a schematic diagram showing a device 1305 that supports techniques for simplified CSI feedback in accordance with various aspects of this disclosure. The device 1305 may be an example of aspects of the device 1205 or the base station 105 described herein. The device 1305 may include a receiver 1310, a communication manager 1315, and a transmitter 1345. The device 1305 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0201] The receiver 1310 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for simplified CSI feedback, etc.). The information may be passed to other components of the device 1305. The receiver 1310 may be an example of aspects of the transceiver 1520 described with reference to Figure 15 The receiver 1310 may utilize a single antenna or a set of antennas.

[0202] The communication manager 1315 may be an example of aspects of the communication manager 1215 described herein. The communication manager 1315 may include a capabilities manager 1320, a CSI measurement resource manager 1325, a configuration manager 1330, a CSI trigger manager 1335, and a CSI report manager 1340. The communication manager 1315 may be an example of aspects of the communication manager 1510 described herein.

[0203] The capabilities manager 1320 may receive a capabilities report from the UE that includes an indication of the CSI reporting capabilities supported by the UE. The CSI measurement resource manager 1325 may identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof, based on the received capabilities report.

[0204] The configuration manager 1330 may send a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration being based on the threshold number of aperiodic CSI measurement resources or the UE memory size or a combination thereof. The configuration manager 1330 may configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook.

[0205] The CSI trigger manager 1335 may send DCI to the UE that triggers a CSI report for a subset of aperiodic CSI measurement resources among one or more aperiodic CSI measurement resources. Additionally or alternatively, the CSI trigger manager 1335 may send DCI to the UE that triggers the first CSI report or the second CSI report or a combination thereof.

[0206] The CSI report manager 1340 may receive the first CSI report or the second CSI report or a combination thereof from the UE based on the received DCI, where the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof.

[0207] The transmitter 1345 may send signals generated by other components of the device 1305. In some examples, the transmitter 1345 may be collocated with the receiver 1310 in a transceiver module. For example, the transmitter 1345 may be an example of aspects of the transceiver 1520 described with reference to Figure 15 The transmitter 1345 may utilize a single antenna or a group of antennas.

[0208] Figure 14FIG. 1400 is a schematic diagram showing a communication manager 1405 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. The communication manager 1405 may be an example of aspects of the communication manager 1215, the communication manager 1315, or the communication manager 1510 described herein. The communication manager 1405 may include a capabilities manager 1410, a CSI measurement resource manager 1415, a configuration manager 1420, a CSI trigger manager 1425, a CSI report manager 1430, a computation time manager 1435, and a parameter manager 1440. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0209] The capabilities manager 1410 may receive a capabilities report from a UE that includes an indication of the CSI reporting capabilities supported by the UE. In some examples, the capabilities manager 1410 may receive a capabilities report from the UE. In some examples, the capabilities manager 1410 may identify, from the capabilities report, a first capabilities indication for concurrently generating a first CSI report and a second CSI report, a second capabilities indication for separately generating the first CSI report, a third capabilities indication for separately generating the second CSI report, or a combination thereof. In some cases, the received capabilities report includes an indication of the UE memory size, where the UE memory size indicates one or more symbol periods of the reception bandwidth for receiving one or more aperiodic CSI measurement resources.

[0210] The CSI measurement resource manager 1415 may identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof, based on the received capabilities report. In some examples, the CSI measurement resource manager 1415 may configure a first set of one or more aperiodic CSI measurement resources based on a first set of parameters, the first set of one or more aperiodic CSI measurement resources being configured for aperiodic CSI reporting. In some cases, the threshold number of aperiodic CSI measurement resources indicates the maximum number of aperiodic CSI measurement resources associated with CSI reporting that the UE is capable of measuring.

[0211] The configuration manager 1420 may send a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, where the configuration is based on a threshold number of aperiodic CSI measurement resources or the UE memory size or a combination thereof. In some examples, the configuration manager 1420 may configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook. In some examples, the configuration manager 1420 may configure a rank threshold value associated with the first CSI report based on the first set of parameters. In some cases, the first type of codebook includes a type II CSI codebook.

[0212] The CSI trigger manager 1425 may send DCI to the UE, where the DCI triggers a CSI report for a subset of the aperiodic CSI measurement resources among one or more aperiodic CSI measurement resources. In some examples, the CSI trigger manager 1425 may send DCI to the UE, where the DCI triggers the first CSI report or the second CSI report or a combination thereof.

[0213] The CSI report manager 1430 may receive from the UE the first CSI report or the second CSI report or a combination thereof based on the received DCI, where the first CSI report is based on the first set of parameters, the second CSI report is based on the second set of parameters, or a combination thereof. In some examples, the CSI report manager 1430 may receive the first CSI report on one or more aperiodic CSI measurement resources. In some cases, the first CSI report includes a broadband CSI report.

[0214] In some examples, the CSI report manager 1430 may receive the first CSI report at least partially based on a first set of CSI calculation times. In some examples, the CSI report manager 1430 may receive the second CSI report at least partially based on a second set of CSI calculation times. In some cases, the CSI report manager 1430 may receive the first CSI report that does not include a rank indicator at least partially based on the rank threshold value.

[0215] The calculation time manager 1435 may configure a first set of CSI calculation times associated with the first CSI report, where the first set of CSI calculation times is different from a second set of CSI calculation times associated with the second CSI report. In some examples, the calculation time manager 1435 may configure a second set of CSI calculation times associated with the second CSI report, where the second set of CSI calculation times is different from the first set of CSI calculation times associated with the first CSI report.

[0216] The parameter manager 1440 may send an indication of the first parameter set and the second parameter set to the UE. In some cases, at least a portion of the first parameter set is different from the second parameter set.

[0217] Figure 15 FIG. shows a schematic diagram of a system 1500 including a device 1505 that supports techniques for simplified CSI feedback, in accordance with aspects of the present disclosure. The device 1505 may be an example of or include components of the device 1205, the device 1305, or the base station 105 as described herein. The device 1505 may include components for two-way voice and data communication, including components for sending and receiving communications, including a communication manager 1510, a network communication manager 1515, a transceiver 1520, an antenna 1525, a memory 1530, a processor 1540, and an inter-station communication manager 1545. These components may communicate electronically via one or more buses (e.g., bus 1550).

[0218] The communication manager 1510 may perform the following operations: receive a capability report from the UE that includes an indication of the CSI reporting capabilities supported by the UE; identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof, based on the received capability report; send a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration being based on the threshold number of aperiodic CSI measurement resources or the UE memory size or a combination thereof; and send DCI to the UE, the DCI triggering a CSI report for a subset of the aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources.

[0219] Additionally or alternatively, the communication manager 1510 may further perform the following operations: configure a first parameter set for a first CSI report associated with a first type of codebook and a second parameter set for a second CSI report associated with a second type of codebook different from the first type of codebook; send DCI to the UE, the DCI triggering the first CSI report or the second CSI report or a combination thereof; and receive from the UE the first CSI report or the second CSI report or a combination thereof based on the received DCI, wherein the first CSI report is based on the first parameter set, the second CSI report is based on the second parameter set, or a combination thereof.

[0220] The network communication manager 1515 may manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1515 may manage the delivery of data communication for client devices (e.g., one or more UEs 115).

[0221] The transceiver 1520 can communicate bidirectionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 1520 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1520 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and for demodulating packets received from the antenna. In some cases, the wireless device can include a single antenna 1525. However, in some cases, the device can have more than one antenna 1525 capable of simultaneously transmitting or receiving multiple wireless transmissions.

[0222] The memory 1530 can include RAM, ROM, or a combination thereof. The memory 1530 can store computer-readable code 1535 including instructions that, when executed by a processor (e.g., processor 1540), cause the device to perform the various functions described herein. In some cases, in addition, the memory 1530 can contain a BIOS that can control basic hardware or software operations such as interactions with peripheral components or devices.

[0223] The processor 1540 can include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor 1540 can be configured to operate a memory array using a memory controller. In some cases, the memory controller can be integrated into the processor 1540. The processor 1540 can be configured to execute computer-readable instructions stored in a memory (e.g., memory 1530) to cause the device 1505 to perform various functions (e.g., functions or tasks supporting techniques for simplifying CSI feedback).

[0224] The inter-station communication manager 1545 can manage communication with other base stations 105 and can include a controller or scheduler for coordinating with other base stations 105 to control communication with the UE 115. For example, the inter-station communication manager 1545 can coordinate the scheduling of transmissions to the UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communication manager 1545 can provide an X2 interface within the LTE / LTE-A wireless communication network technology to provide communication between base stations 105.

[0225] Code 1535 may include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communications. Code 1535 may be stored in a non-transitory computer-readable medium such as system memory or other types of memory. In some cases, code 1535 may not be directly executable by processor 1540, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0226] Figure 16 FIG. 1600 is a flow chart illustrating a method 1600 for supporting techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. Operations of method 1600 may be implemented by a UE 115 or components thereof as described herein. For example, operations of method 1600 may be performed by a communication manager as described with reference to Figures 8 to 11 In some examples, the UE may execute an instruction set to control functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0227] At 1605, the UE may send a capability report indicating the UE's support for an aperiodic CSI measurement resource trigger offset to the base station. The operation of 1605 may be performed according to the methods described herein. In some examples, aspects of the operation of 1605 may be performed by a UE capability component as described with reference to Figures 8 to 11 described.

[0228] At 1610, the UE may receive a configuration of one or more aperiodic CSI measurement resources. The operation of 1610 may be performed according to the methods described herein. In some examples, aspects of the operation of 1610 may be performed by a CSI manager as described with reference to Figures 8 to 11 described.

[0229] At 1615, the UE may receive DCI triggering a CSI report for a first subset of aperiodic CSI measurement resources among one or more aperiodic CSI measurement resources, the DCI being based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset. The operation of 1615 may be performed according to the methods described herein. In some examples, aspects of the operation of 1615 may be performed by a CSI manager as described with reference to Figures 8 to 11 described.

[0230] At 1620, the UE may send a CSI report indicating measurements of the first subset of aperiodic CSI measurement resources to the base station. The operation of 1620 may be performed according to the methods described herein. In some examples, aspects of the operation of 1620 may be performed by a CSI transmission component as described with reference to Figures 8 to 11 described.

[0231] Figure 17 shows a flowchart of method 1700 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. Operations of method 1700 may be implemented by UE 115 or its components as described herein. For example, operations of method 1700 may be performed by a communication manager as described with reference to Figures 8 to 11 described. In some examples, the UE may execute an instruction set to control functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0232] At 1705, the UE may receive DCI from a base station, where the DCI triggers a first CSI report associated with a first type of codebook and a second CSI report associated with a second type of codebook different from the first type of codebook. The operation of 1705 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1705 may be performed by a CSI manager as described with reference to Figures 8 to 11 described.

[0233] At 1710, the UE may generate one of the first CSI report or the second CSI report using a set of one or more CSI processing units based on the first type of codebook and the second type of codebook, where the first CSI report is processed using each CSI processing unit in the set of one or more CSI processing units based on the first type of codebook, or where the second CSI report is processed using a subset of the CSI processing units in the set of one or more CSI processing units based on the second type of codebook, or a combination thereof. The operation of 1710 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1710 may be performed by a CSI generation component as described with reference to Figures 8 to 11 described.

[0234] At 1715, the UE may transmit the generated CSI report. The operation of 1715 may be performed in accordance with the methods described herein. In some examples, aspects of the operation of 1715 may be performed by a CSI transmission component as described with reference to Figures 8 to 11 described.

[0235] Figure 18 shows a flowchart of method 1800 that supports techniques for simplifying CSI feedback in accordance with aspects of the present disclosure. Operations of method 1800 may be implemented by UE 115 or its components as described herein. For example, operations of method 1800 may be performed by a communication manager as described with reference to Figures 8 to 11be performed by the described communication manager. In some examples, the UE may execute an instruction set to control functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0236] At 1805, the UE may receive DCI that triggers a first CSI report associated with a first type of codebook or a second CSI report associated with a second type of codebook different from the first type of codebook, or a combination thereof. The operation at 1805 may be performed according to the methods described herein. In some examples, aspects of the operation at 1805 may be performed by a CSI manager as described in reference to Figures 8 to 11 the description.

[0237] At 1810, the UE may generate a first CSI report using a first set of parameters and a first type of codebook, or a second CSI report using a second set of parameters and a second type of codebook, or a combination thereof, based on the received DCI. The operation at 1810 may be performed according to the methods described herein. In some examples, aspects of the operation at 1810 may be performed by a CSI generation component as described in reference to Figures 8 to 11 the description.

[0238] At 1815, the UE may transmit the first CSI report or the second CSI report or a combination thereof. The operation at 1815 may be performed according to the methods described herein. In some examples, aspects of the operation at 1815 may be performed by a CSI transmission component as described in reference to Figures 8 to 11 the description.

[0239] Figure 19 FIG. 1900 is a flow diagram of a method 1900 that supports techniques for simplified CSI feedback in accordance with aspects of the present disclosure. The operations of method 1900 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of method 1900 may be performed by a communication manager as described in reference to Figures 12 to 15 the description. In some examples, the base station may execute an instruction set to control functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described herein.

[0240] At 1905, the base station may receive a capability report from the UE that includes an indication of CSI reporting capabilities supported by the UE. The operation at 1905 may be performed according to the methods described herein. In some examples, aspects of the operation at 1905 may be performed by a capability manager as described in reference to Figures 12 to 15 the description.

[0241] At 1910, the base station may identify a threshold number of aperiodic CSI measurement resources, a UE memory size associated with buffering aperiodic CSI measurement resources, or a combination thereof, based on the received capability report. Operations at 1910 may be performed according to the methods described herein. In some examples, aspects of the operations at 1910 may be performed by a CSI measurement resource manager as described in reference to Figures 12 to 15 described.

[0242] At 1915, the base station may send a configuration of one or more aperiodic CSI measurement resources for CSI reporting by the UE, the configuration being based on the threshold number of aperiodic CSI measurement resources or the UE memory size or a combination thereof. Operations at 1915 may be performed according to the methods described herein. In some examples, aspects of the operations at 1915 may be performed by a configuration manager as described in reference to Figures 12 to 15 described.

[0243] At 1920, the base station may send DCI to the UE, the DCI triggering a CSI report for a subset of aperiodic CSI measurement resources among one or more aperiodic CSI measurement resources. Operations at 1920 may be performed according to the methods described herein. In some examples, aspects of the operations at 1920 may be performed by a CSI trigger manager as described in reference to Figures 12 to 15 described.

[0244] Figure 20 FIG. 2000 is a flow diagram of a method 2000 that supports techniques for facilitating CSI feedback in accordance with aspects of the present disclosure. Operations of method 2000 may be implemented by a base station 105 or components thereof as described herein. For example, operations of method 2000 may be performed by a communication manager as described in reference to Figures 12 to 15 described. In some examples, the base station may execute an instruction set to control functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described herein.

[0245] At 2005, the base station may configure a first set of parameters for a first CSI report associated with a first type of codebook and a second set of parameters for a second CSI report associated with a second type of codebook different from the first type of codebook. Operations at 2005 may be performed according to the methods described herein. In some examples, aspects of the operations at 2005 may be performed by a configuration manager as described in reference to Figures 12 to 15 described.

[0246] At 2010, the base station may send DCI to the UE, and the DCI triggers the first CSI report or the second CSI report or a combination thereof. The operation of 2010 may be performed according to the methods described herein. In some examples, aspects of the operation of 2010 may be performed by a CSI trigger manager as referenced Figures 12 to 15 described.

[0247] At 2015, the base station may receive from the UE the first CSI report or the second CSI report or a combination thereof based on the received DCI, where the first CSI report is based on a first set of parameters, the second CSI report is based on a second set of parameters, or a combination thereof. The operation of 2015 may be performed according to the methods described herein. In some examples, aspects of the operation of 2015 may be performed by a CSI report manager as referenced Figures 12 to 15 described.

[0248] It should be noted that the methods described herein describe possible implementations, and the operations and steps may be rearranged or otherwise modified, and other implementations are possible. Further, aspects of two or more methods from the method may be combined.

[0249] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of example, and the LTE, LTE-A, LTE-A Pro, or NR terms may be used in most of the description, the techniques described herein apply beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may apply to various other wireless communication systems such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0250] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the specification may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0251] The various illustrative blocks and components described in connection with the disclosure herein can be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a digital signal processor (DSP) and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0252] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on or transmitted over a computer-readable medium as one or more instructions or code. Other examples and implementations are within the scope and spirit of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these items. The features implementing the functions can also be physically located in various places, including being distributed such that portions of the functions are implemented at different physical locations.

[0253] Computer-readable media includes both non-transitory computer data storage media and communication media, where the communication media includes any medium that facilitates transfer of a computer program from one place to another. The non-transitory storage media can be any available medium that can be accessed by a general purpose computer or a special purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code units in the form of instructions or data structures and that can be accessed by a general purpose computer or a special purpose computer or a general purpose processor or a special purpose processor. Additionally, any connection is properly termed a computer-readable medium. For example, if software is transmitted using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave from a website, server, or other remote source, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc, where disks typically reproduce data magnetically, while discs typically reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0254] As used herein (including in the claims), when used in a list of two or more items, the term “and / or” means that any one of the listed items can be taken separately, or any combination of two or more of the listed items can be taken. For example, if a composition is described as including components A, B, and / or C, the composition can include: only A; only B; only C; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B, and C. As used herein (including in the claims), as used in a list of items (e.g., a list that ends with a phrase such as “at least one of” or “one or more of”), “or” indicates a disjunctive list, such that a list of, for example, “at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

[0255] In the drawings, like components or features may have the same reference numeral. Further, various components of the same type may be distinguished by following the reference numeral with a dash and a second numeral that differentiates among the like components. If only the first reference numeral is used in the specification, the description applies to any one of the like components having the same first reference numeral, regardless of the second or subsequent reference numerals.

[0256] The specification set forth herein describes example configurations in conjunction with the drawings, and does not represent all examples that may be implemented or that are within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," and not "preferred over other examples" or "advantageous over other examples." For the purpose of providing an understanding of the described technology, the detailed description includes specific details. However, the technology may be practiced without these specific details. In some instances, well-known structures and devices are shown in schematic form to avoid obscuring the concepts of the described examples.

[0257] The description provided herein enables a person of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: Sending a capability report indicating an aperiodic channel state information measurement resource trigger offset supported by the UE, the capability report indicating the aperiodic channel state information measurement resource trigger offset as follows: the aperiodic channel state information measurement resource trigger offset is a threshold duration after receiving downlink control information during which the UE is capable of receiving one or more aperiodic channel state information measurement resources; Receiving a configuration of the one or more aperiodic channel state information measurement resources; Receiving the downlink control information triggering a channel state information report for a first subset of aperiodic channel state information measurement resources among the one or more aperiodic channel state information measurement resources, the downlink control information being at least partially based on the configuration of the one or more aperiodic channel state information measurement resources and the aperiodic channel state information measurement resource trigger offset; And Sending a channel state information report indicating measurements of the first subset of aperiodic channel state information measurement resources.

2. The method according to claim 1, wherein Sending the capability report includes: Sending the capability report indicating the aperiodic channel state information measurement resource trigger offset, the aperiodic channel state information measurement resource trigger offset indicating a processing time for decoding the downlink control information supported by the UE.

3. The method according to claim 1, wherein, The aperiodic channel state information measurement resource trigger offset indicates one or more symbol periods, one or more slot durations, or a combination thereof.

4. The method according to claim 1, wherein Sending the capability report includes: Sending the capability report indicating a threshold number of aperiodic channel state information measurement resources associated with the channel state information report that the UE is capable of measuring, wherein the channel state information report includes measurements of at least one aperiodic channel state information measurement resource among the one or more aperiodic channel state information measurement resources up to the threshold number.

5. The method according to claim 4, wherein The threshold number of aperiodic channel state information measurement resources indicates a maximum number of aperiodic channel state information measurement resources associated with the channel state information report that the UE is capable of measuring.

6. The method according to claim 1, wherein, Sending the capability report includes: Sending the capability report including an indication of a buffer memory size, wherein the configuration of the one or more aperiodic channel state information measurement resources is at least partially based on the buffer memory size.

7. The method according to claim 1, wherein The channel state information report includes an aperiodic channel state information report.

8. A method for wireless communication at a network device, comprising: Receiving a capability report including an indication of a channel state information reporting capability supported by a user equipment (UE); Identifying, at least partially based on the received capability report, a threshold number of aperiodic channel state information measurement resources, a UE memory size associated with buffering aperiodic channel state information measurement resources, or a combination thereof; Transmit a configuration of one or more aperiodic channel state information (CSI) measurement resources for CSI reporting by the UE, where the configuration is at least partially based on a threshold number of the aperiodic CSI measurement resources or the UE memory size or a combination thereof; and Transmit downlink control information that triggers the CSI reporting for a subset of the aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources.

9. The method according to claim 8, wherein, The received capability report includes an indication of the UE memory size, where the UE memory size indicates one or more symbol periods of a reception bandwidth for receiving the one or more aperiodic CSI measurement resources.

10. The method according to claim 8, wherein, The threshold number of the aperiodic CSI measurement resources indicates a maximum number of aperiodic CSI measurement resources associated with the CSI reporting that the UE is capable of measuring.

11. An apparatus for wireless communication at a user equipment (UE), comprising: a processor, a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the following operations: Transmit a capability report indicating an aperiodic CSI measurement resource trigger offset supported by the UE, where the aperiodic CSI measurement resource trigger offset is a threshold duration after receiving downlink control information within which the UE is capable of receiving one or more aperiodic CSI measurement resources; Receive the configuration of the one or more aperiodic CSI measurement resources; Receive the downlink control information that triggers the CSI reporting for a first subset of aperiodic CSI measurement resources among the one or more aperiodic CSI measurement resources, where the downlink control information is at least partially based on the configuration of the one or more aperiodic CSI measurement resources and the aperiodic CSI measurement resource trigger offset; and Transmit a CSI report indicating measurements of the first subset of aperiodic CSI measurement resources.

12. The apparatus according to claim 11, wherein, The instructions for transmitting the capability report are executable by the processor to cause the apparatus to perform the following operations: Transmit the capability report indicating the aperiodic CSI measurement resource trigger offset, where the aperiodic CSI measurement resource trigger offset indicates a processing time supported by the UE for decoding the downlink control information.

13. The apparatus according to claim 11, wherein, The aperiodic CSI measurement resource trigger offset indicates one or more symbol periods, one or more slot durations, or a combination thereof.

14. The apparatus according to claim 11, wherein, The instructions for transmitting the capability report are executable by the processor to cause the apparatus to perform the following operations: Transmit the capability report indicating the threshold number of aperiodic channel state information measurement resources associated with the channel state information report that the UE is capable of measuring, wherein the channel state information report includes measurements for at least one aperiodic channel state information measurement resource among the one or more aperiodic channel state information measurement resources up to the threshold number of aperiodic channel state information measurement resources.

15. The device according to claim 14, wherein, The threshold number of the aperiodic channel state information measurement resources indicates the maximum number of aperiodic channel state information measurement resources associated with the channel state information report that the UE is capable of measuring.

16. The apparatus according to claim 11, wherein, The instructions for transmitting the capability report are executable by the processor to cause the device to perform the following operations: Transmit the capability report including an indication of a buffer memory size, wherein the configuration of the one or more aperiodic channel state information measurement resources is at least partially based on the buffer memory size.

17. A device for wireless communication at a network device, comprising: A processor, A memory coupled to the processor; And Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: Receive a capability report including an indication of a channel state information reporting capability supported by a user equipment (UE); Identify at least partially based on the received capability report a threshold number of aperiodic channel state information measurement resources, a UE memory size associated with buffering aperiodic channel state information measurement resources, or a combination thereof; Transmit a configuration of one or more aperiodic channel state information measurement resources for channel state information reporting by the UE, the configuration being at least partially based on the threshold number of aperiodic channel state information measurement resources or the UE memory size or a combination thereof; and Transmit downlink control information that triggers the channel state information report for a subset of the aperiodic channel state information measurement resources among the one or more aperiodic channel state information measurement resources.

18. The apparatus according to claim 17, wherein, The received capability report includes an indication of the UE memory size, wherein the UE memory size indicates one or more symbol periods of a reception bandwidth for receiving the one or more aperiodic channel state information measurement resources.

19. The device according to claim 17, wherein, The threshold number of the aperiodic channel state information measurement resources indicates the maximum number of aperiodic channel state information measurement resources associated with the channel state information report that the UE is capable of measuring.

20. A device for wireless communication at a user equipment (UE), comprising: A unit for sending a capability report indicating an aperiodic channel state information measurement resource trigger offset supported by the UE, the capability report indicating the aperiodic channel state information measurement resource trigger offset as follows: the aperiodic channel state information measurement resource trigger offset is a threshold duration after receiving downlink control information after which the UE is capable of receiving one or more aperiodic channel state information measurement resources; A unit for receiving the configuration of the one or more aperiodic channel state information measurement resources; A unit for receiving the downlink control information that triggers a channel state information report for a first subset of aperiodic channel state information measurement resources among the one or more aperiodic channel state information measurement resources, the downlink control information being at least partially based on the configuration of the one or more aperiodic channel state information measurement resources and the aperiodic channel state information measurement resource trigger offset; And A unit for sending a channel state information report indicating measurements of the first subset of aperiodic channel state information measurement resources.

21. An apparatus for wireless communication at a network device, comprising: A unit for receiving a capability report including an indication of a channel state information reporting capability supported by a user equipment (UE); A unit for identifying, at least partially based on the received capability report, a threshold number of aperiodic channel state information measurement resources, a UE memory size associated with buffering aperiodic channel state information measurement resources, or a combination thereof; A unit for sending a configuration of one or more aperiodic channel state information measurement resources for channel state information reporting by the UE, the configuration being at least partially based on the threshold number of aperiodic channel state information measurement resources or the UE memory size or a combination thereof; And A unit for sending downlink control information that triggers the channel state information report for a subset of aperiodic channel state information measurement resources among the one or more aperiodic channel state information measurement resources.

22. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code including instructions executable by a processor to perform the following operations: Send a capability report indicating an aperiodic channel state information measurement resource trigger offset supported by the UE, the capability report indicating the aperiodic channel state information measurement resource trigger offset as follows: the aperiodic channel state information measurement resource trigger offset is a threshold duration after receiving downlink control information after which the UE is capable of receiving one or more aperiodic channel state information measurement resources; Receive the configuration of the one or more aperiodic channel state information measurement resources; Receiving the downlink control information that triggers a channel state information report for a first subset of aperiodic channel state information measurement resources among the one or more aperiodic channel state information measurement resources, where the downlink control information is at least partially based on the configuration of the one or more aperiodic channel state information measurement resources and the aperiodic channel state information measurement resource trigger offset; And Transmitting a channel state information report that indicates measurements on the first subset of aperiodic channel state information measurement resources.

23. A non-transitory computer-readable medium storing code for wireless communication at a network device, the code including instructions executable by a processor to perform the following operations: Receiving a capability report including an indication of a channel state information reporting capability supported by a user equipment (UE); Identifying a threshold number of aperiodic channel state information measurement resources, a UE memory size associated with buffering aperiodic channel state information measurement resources, or a combination thereof, at least partially based on the received capability report; Transmitting a configuration of one or more aperiodic channel state information measurement resources for channel state information reporting by the UE, where the configuration is at least partially based on the threshold number of aperiodic channel state information measurement resources or the UE memory size or a combination thereof; and Transmitting downlink control information that triggers the channel state information report for a subset of aperiodic channel state information measurement resources among the one or more aperiodic channel state information measurement resources.

Images