Techniques for channel state information reporting

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, a signal indicating a configuration for the UE to report channel state information (CSI) associated with a first set of reference signals. In some examples, the UE may receive a set of reference signals less than the first set and evaluate one or more rules for generating a CSI report based on receiving the set of reference signals. In some examples, the UE may refrain from generating the CSI report if none of the reference signals from the first set are received. In some examples, the UE may refrain from generating the CSI report of at least one reference signal is missing from the first set. In some examples, the UE may refrain from generating the CSI report if a threshold number of reference signals are missing from the first set.

FIELD OF TECHNOLOGY

The following relates to wireless communications, including techniques for channel state information (CSI) reporting.

BACKGROUND

A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE). In some examples of wireless communication, channel estimation techniques may be deficient.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support techniques for channel state information (CSI) reporting. For example, a wireless communications system may be configured to support channel estimation for multiple network devices. In such systems, a first wireless device may transmit to a second wireless device one or more CSI reference signals that the second wireless may use to perform channel estimation on an associated channel. In some examples, the second wireless device may generate and transmit a CSI report to the first wireless device that may include the performed channel estimation information. In some examples, the first wireless device may transmit one or more pairs of reference signals that are associated with multiple transmission and reception points (TRPs) that the second wireless device may utilize to transmit an associated CSI report to the multiple TRPs indicated. In some cases, the second wireless device may not receive one or more anticipated reference signals for a CSI report and may operate in accordance with one or more rules to determine whether to generate a CSI report.

A method for wireless communications at a user equipment (UE) is described. The method may include receiving, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals, evaluating one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals, and performing CSI operations according to the one or more rules.

An apparatus for wireless communications at a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals, evaluate one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals, and perform CSI operations according to the one or more rules.

Another apparatus for wireless communications at a UE is described. The apparatus may include means for receiving, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals, means for evaluating one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals, and means for performing CSI operations according to the one or more rules.

A non-transitory computer-readable medium storing code for wireless communications at a UE is described. The code may include instructions executable by a processor to receive, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals, evaluate one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals, and perform CSI operations according to the one or more rules.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from generating the CSI report if none of the reference signals from the first set of reference signals may be in the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from generating the CSI report if at least one reference signal from the first set of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from generating the CSI report if at least a threshold number of reference signals from the first set of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules include one or more rules for calculating a CSI processing unit (CPU) occupation, the one or more rules for calculating the CPU occupation indicating that the UE may be to calculate the CPU occupation as zero if at least one reference signal from the first set of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules include one or more rules for calculating a CPU occupation, the one or more rules for calculating the CPU occupation indicating that the UE may be to calculate the CPU occupation based on the received set of reference signals if at least one reference signal from the first set of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules include one or more rules for calculating a CPU occupation, the one or more rules for calculating the CPU occupation indicating that the UE may be to calculate the CPU occupation based on the received set of reference signals if at least a threshold number of reference signals from the first set of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules include one or more rules for calculating an active resource occupation or an active port occupation, the one or more rules for calculating the active resource occupation or the active port occupation indicating that the UE may be to refrain from including at least one reference signal in calculating the active resource occupation or the active port occupation during a time period if the at least one reference signal from the first set of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the at least one reference signal includes at least one of a periodic reference signal, an aperiodic reference signal, a semi-persistent reference signal, or a combination thereof.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules include one or more rules for calculating an active resource occupation, the one or more rules for calculating the active resource occupation indicating that the UE may be to refrain from including at least one reference signal in calculating the active resource occupation if the at least one reference signal from the first set of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, a first CSI hypothesis corresponds to a reference signal from the first set of reference signals and a second CSI hypothesis corresponds to a pair of reference signals from the first set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from evaluating the second CSI hypothesis if a first reference signal from the pair of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from evaluating the second CSI hypothesis if a second reference signal from the pair of reference signals does not correspond to the first CSI hypothesis or may be not included in a second pair of reference signals corresponding to the second CSI hypothesis.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from generating the CSI report if the reference signal from the first set of reference signals and a second reference signal from the pair of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from generating the CSI report if the at least one of the reference signal from the first set of reference signals and a second reference signal from the pair of reference signals may be missing from the received set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from generating the CSI report if at least a threshold number of reference signals from the first set of reference signals may be missing from the received set of reference signals, the threshold number of reference signals corresponding to the first CSI hypothesis, or the second CSI hypothesis, or both.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from generating the CSI report if at least one reference signal from the first set of reference signals may be missing from the received set of reference signals and that the UE may be to generate a set of multiple CSI reports corresponding to a remaining number of reference signals of the first set of reference signals.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to refrain from transmitting an uplink channel if the UE refrains from generating the CSI report.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the one or more rules indicate that the UE may be to transmit an uplink channel including an uplink control information or an uplink transport block if the UE refrains from generating the CSI report.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, at least one reference signal from the first set of reference signals may be missing from the received set of reference signals based on a listen before talk failure in unlicensed band, an uplink and downlink symbol conflict, a resource overlap with a downlink channel, or a combination thereof.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the uplink and downlink symbol conflict may be based on detection of at least one of a downlink control information (DCI) scheduling uplink signal, a slot format indicator, an overlap between a physical random access channel (PRACH) occasion and a gap symbol prior to the PRACH occasion, or a combination thereof.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the resource overlap with the downlink channel may be determined based on a channel type, a priority of downlink channel compared to a priority of the CSI resource, a scheduling of the downlink channel, or a combination thereof.

DETAILED DESCRIPTION

In some wireless communications systems, a first wireless device (e.g., a base station) may transmit one or more channel state information (CSI) reference signals (CSI-RS) to a second wireless device (e.g., a user equipment (UE)). In some examples, the CSI-RS may indicate resources, such as one or more channel measurement resources (CMRs) or interference measurement resources (IMRs) that the UE may use to measure various channel qualities. The UE may then include the measurements in a CSI report for the base station. The UE may utilize one or more CSI processing units (CPUs) to handle the complexity associated with the various CSI computations such that the number of CPUs may be equal to the number of CMRs configured for the CSI report. In some cases, however, the UE may not receive one or more CSI resources (e.g., CMRs and IMRs) from the base station. While various CSI resources may be dropped, in some examples, the UE may still generate a CSI report which may increase the number of occupied CPUs, the number of active resource, and the number of occupied ports occupation at the UE. As such, the UE may experience an increase in overall power consumption based on the increase in CPU occupation and signaling overhead based on increase in the number of generated CSI reports.

By operating in accordance with the techniques described herein, a UE may refrain from transmitting a CSI report to a base station (e.g., drop the CSI report) based on a set of configured rules at the UE. For example, the configured rules may indicate to the UE when to drop a CSI report. In some instances, the rules may indicate that the UE is to refrain from transmitting the CSI report when a base station drops or the UE does not receive at least one CSI-RS resource. In some examples, the UE may determine to refrain from transmitting the CSI report if all CMRs associated with the CSI report are dropped. In some examples, the UE may determine to refrain from transmitting the CSI report if at least one CMR associated with the CSI report is dropped. In some examples, the UE may determine to refrain from transmitting the CSI report if the number of dropped CMRs associated with the CSI report is greater than a configured threshold. The UE may determine to refrain from transmitting the CSI report based on the priority of the CSI. Additionally or alternatively, the rules for dropping the CSI report may be configured by the base station based on latency and reliability constraints. In some cases, the UE may participate in transmitting CSI reports to multiple transmission and reception points (mTRPs) at one or more base stations. In such cases, the CSI report may be associated with one or more pairs of CMRs each associated with a respective TRP. If at least one of the two CMRs are dropped, the UE may not count the pair of CMRs towards an active resource or port occupation. The UE may determine to drop a CSI report associated with pairs of CRMs.

UEs supporting techniques for CSI reporting depicted herein may utilize the techniques described herein to experience power savings and extended battery life while ensuring reliable and efficient communications. Particular aspects of the subject matter described in this disclosure may be implemented to support high reliability and low latency communications, among other examples. The described techniques may thus include features for improvements to power consumption, spectral efficiency, higher data rates and, in some examples, may promote efficiency for high reliability and low latency operations, among other benefits.

Aspects of the disclosure are initially described in the context of wireless communications systems, CSI report configurations, CSI report generations, and signaling techniques. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for CSI reporting.

In some examples, a base station105and a UE115may participate in channel estimation techniques to determine the quality and other characteristics of a physical channel. For example, the base station105may transmit to the UE115one or more CSI-RSs which the UE may leverage to perform various channel estimations. For example, the base station105may transmit CMRs for the UE115to conduct various channel measurements and IMRs for the UE115to measure the interference on the channel. In some examples, the UE115may include the one or more measurements conducted using the CMRs and IMRs to generate a CSI report for the base station105.

In accordance with examples as disclosed herein, devices of wireless communications system100may be configured with a set of one or more rules used to determine whether to generate a CSI report. That is, in some cases, the UE115may refrain from generating a CSI report associated with a set of CSI-RSs if the UE115receives a subset of the set of CSI-RSs (e.g., one or more CSI resources are dropped by the base station105). In some examples, the one or more rules may indicate that the UE115is to drop a CSI report if all CMRs associated with the CSI report are not received or dropped by the base station105. In some examples, the one or more rules may indicate that the UE115is to drop a CSI report if at least one CMR associated with the CSI report is dropped by the base station105. In some examples, the one or more rules may indicate that the UE115is to drop the CSI report if the number of dropped CMRs associated with the CSI report is greater than a configured threshold (e.g., a threshold configured by the network, configured by the base station105, or preconfigured at the UE115). The UE115may determine whether to drop a CSI report based on a priority of the CSI or the UE115may be configured by the network based on latency and reliability constraints.

In some cases, the UE115may participate in mTRP CSI reporting at one or more base stations105. In such cases, the CSI report may be associated with one or more pairs of CMRs each associated with a respective TRP. If at least one of the two CMRs are dropped, the pair of CMRs may not be counted toward CPU occupation, active resources, or port occupation. Each pair of CMRs may be associated with a non-coherent joint transmission (NCJT) hypothesis and the UE115may determine to generate a CSI report based on the NCJT based on the one or more rules described herein.

FIG.2illustrates an example of a wireless communications system200that supports techniques for CSI reporting in accordance with aspects of the present disclosure. In some examples, the wireless communications system200may implement aspects of wireless communications system100. The wireless communications system200includes a base station105-a, which may be an example of a base station105as depicted in the example ofFIG.1, a geographic coverage area110-awhich may be an example of a geographic coverage area110as depicted in the example ofFIG.1, and a UE115-a, which may be examples of a UE115as depicted in the example ofFIG.1. In some cases of wireless communications system200, the base station105-amay transmit one or more downlink reference signals205to the UE115-a. In some implementations, the downlink reference signals205may be CSI-RSs, which the UE115-amay use to generate a CSI report210for the base station105-a. Additionally or alternatively, the base station105-amay transmit a signal indicating a configuration for the UE115-ato use in reporting CSI corresponding to the downlink reference signals205. The UE115-amay determine whether to generate and transmit the CSI report210based on evaluating one or more rules for generating the CSI report210if the received set of downlink reference signals205is less than an anticipated number of reference signals. For example, the UE115-amay perform channel state information operations which may include one or more steps related to measuring and reporting CSI information or reports. In some examples, based on the evaluation of the one or more rules, the channel state information operations may include determine whether to generate a CSI report, and in some cases may include refraining from generating a CSI report.

The wireless communications system200may support beamforming communications between the base station105-aand the UE115-a. In some examples, the base station105-aand the UE115-amay communicate with one another using one or more channels (such as physical channels) to transmit and receive control signal and data. In some examples of the wireless communications system200, the one or more channels may experience interference which may modify a signal in a disruptive manner, as it travels along a communication channel between the base station105-aand UE115-a. In the example of wireless communications system200, channel interference may be caused by physical boundaries (e.g., passing cars, buildings, trees, etc.), by transmission from other wireless devices in the same direction of the base station105-aand the UE115-aor on the same frequency band, by self-interference, or a combination thereof. As such, the wireless devices in wireless communications system200may estimate and communicate conditions of the communication channels. For example, the base station105-amay transmit one or more downlink reference signals205which the UE115-amay use for the purpose of channel sounding to measure characteristics of a radio channel. As depicted in the example ofFIG.2, the UE115-amay use the downlink reference signals205to generate a CSI report210that the UE115-amay then transmit to the base station105-a. The CSI report210may include a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank indicator (RI). The CSI report210may indicate interference between multiple antennas at the UE115-a, among other examples. The base station105-amay receive the CSI report210and may use its contents to update a modulation coding scheme (MCS), a code, or beam forming, among other examples, to improve the channel quality.

The downlink reference signals205may include various resources for the UE115-ato use in generating the CSI report210. For example, the downlink reference signals205may include channel measurement resources (CMRs), CSI interference measurement (CSI-IM) resources, and non-zero-power (NZP) interference measurement resources (NZP-IMRs). The UE115-amay use the CMRs, the CSI-IM resources, and the NZP-IMRs included in the downlink reference signals205to measure various channel qualities. For generating the CSI report210, the UE may utilize one or more CPUs to handle the complexity associated with the various CSI computations. In some examples, the number of CPUs may be equal to the number of CMRs configured for the CSI report210. In some cases, however, the UE115-amay not receive one or more CSI resources. In some cases, the UE115-amay not receive the resources due to listen-before-talk (LBT) failure in cases in which the base station105-aand the UE115-aare communicating in an unlicensed frequency band.

According to one or more aspects, the UE115-amay determine that at least one reference signal is missing based on an LBT failure in unlicensed band, an uplink and downlink symbol conflict, a resource overlap with a downlink channel, or a combination thereof. In some cases, the UE115-amay not receive the CMRs due to time division duplex (TDD) uplink and downlink symbol conflict. For example, some of the symbols intended for transmission of the downlink reference signals205may be identified as uplink symbols, and as such the base station105-amay drop at least one reference signal from the downlink reference signals205and their associated resources for these symbols. This TDD symbol conflict may be caused based on detection of a DCI scheduling uplink signals or channels (such as a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), a sounding reference signal (SRS), or a physical random access channel (PRACH)). The uplink and downlink symbol conflict may be based on detection of at least one of a DCI scheduling uplink signal, an SFI, an overlap between a PRACH occasion and a gap symbol prior to the PRACH occasion, or a combination thereof. In some examples, the TDD symbol conflict may be determined based on the base station105-adetecting a slot format indicator (SFI) of DCI format 2_0, which may indicate some of the symbols as uplink or flexible symbols, or it may be based on overlap with a valid PRACH occasion and a number of gap symbols before the PRACH occasion.

In some cases, the UE115-amay not receive one or more resources included in the downlink reference signals205due to resource (e.g., time and frequency) overlap with another downlink channel or signal. The UE115-amay determine the resource overlap with the downlink channel based on a channel type, a priority of downlink channel compared to a priority of the CSI resource, a scheduling of the downlink channel, or a combination thereof. For example, a CSI-RS resource may be dropped if the resource overlaps with another physical downlink shared channel (PDSCH), a physical downlink shared channel (PDCCH), or with a synchronization signal block (SBB). In another example, a CSI-RS resource may be dropped based on priority of another downlink channel or signal compared to the priority of the CSI-RS resource (e.g., a CSI-RS with a priority of 0 is dropped if it overlaps with another CSI-RS resource with a priority of 1). In another example, a CSI-RS resource may be dropped based on whether a CSI-RS resource or the associated downlink channel or signal is configured by a higher-layers or is dynamically scheduled by a DCI (e.g., periodic CSI-RS resource may be dropped due to overlap with dynamically scheduled PDSCH or due to overlap with an aperiodic CSI-RS dynamically scheduled by DCI).

The UE115-amay be configured to report CSI corresponding to a first set of reference signals (e.g., anticipated downlink reference signals205). In some examples, the UE115-amay receive a set of downlink reference signals205less than the first set of reference signals. If the UE115-areceives a subset of the anticipated downlink reference signals205, the UE115-amay still determine to utilize resources to generate the CSI report210. For example, the UE115-amay evaluate one or more rules for generating the CSI report210if the received set of downlink reference signals205is less than the first set of reference signals. Despite examples in which one or more CSI resources may be dropped by the base station105-a, the UE115-amay generate the CSI report210which may increase a number of occupied CPUs, active resources, and port occupation at the UE115-athus increasing overall power consumption and signaling overhead.

To minimize the occupation of CPUs and use of processing resources, the UE115-amay determine to not transmit a CSI report210to a base station105-a(e.g., drop the CSI report210) based on not receiving, from the base station105-a, one or more CSI resources included in the downlink reference signals205. In some examples, the UE115-amay determine to drop a CSI report210if all CMRs associated with the CSI report210are dropped. In some examples, the UE115-amay determine to drop a CSI report210if at least one CMR associated with the CSI report210is dropped. In some examples, the UE115-amay determine to drop the CSI report210if the number of dropped CMRs associated with the CSI report210is greater than a configured threshold. The UE115-amay determine whether to drop a CSI report210based on a priority of the CSI. Additionally or alternatively, rules for dropping a CSI report210may be configured by the network based on latency and reliability constraints. Further description of the various rules used by the UE115-ato determine whether to generate and transmit a CSI report210are described herein, including with reference toFIGS.3and4.

In some cases, the UE115-amay participate in transmitting one or more CSI reports210in accordance with an mTRP operation. For example, the base station105-amay configure the UE115-ato transmit one or more CSI reports210to one or more TRPs that may be located at the base station105-aor one or more other base station105-as105(e.g., a non-coherent joint transmission (NCJT) CSI report). In such examples of an NCJT CSI report, the CSI report210may be associated with one or more pairs of CMRs such that each CMR in a pair is associated with a respective TRP. If at least one of the two CMRs are dropped, the UE115-amay determine that the pair of CMRs is not counted toward active resource or port occupation. The UE115-amay determine to drop the CSI report210associated with the pair of CRMs in a similar method for dropping a CSI report210associated with independent CRMs for singe TRP (sTRP) transmissions. Further description of the various rules used by the UE115-ato determine whether to generate and transmit a NCJT CSI report210are described herein, including with reference toFIG.6.

FIG.3illustrates an example of a CSI report framework300that supports techniques for CSI reporting in accordance with aspects of the present disclosure. In some examples, the CSI report framework300may implement aspects of the wireless communications system100and the wireless communications system200. The CSI report framework300may be an example of a framework used by a UE115and a base station105to generate a CSI report.

The CSI report framework300illustrates a CSI report configuration305that may be used by a UE115to generate a CSI report for a base station105. The CSI report configuration305may include one or more links to one or more resource settings. In some examples, the CSI report configuration305may have a link to a CMR resource setting310. In some examples, the CSI report configuration305may indicate the CMR resource setting310as well as either a CSI-IM resource setting315or an NZP-IMR resource setting320. In some examples, the CSI report configuration305may have a link to the CMR resource setting310, the CSI-IM resource setting315, and the NZP-IMR resource setting320.

As illustrated in the CSI report framework300, each of the resource settings may include an active resource set. For example, the CMR resource setting310may include or otherwise indicate multiple CMR resource sets325in which CMR resource set n is activated. The CSI-IM resource setting315may include multiple CSI-IM resource sets330in which the CSI-IM resource set m is activated, and the NZP-IMR resource setting320may include multiple NZP-IMR resource sets335in which the NZP-IMR resource set s is activated. Each of the resource sets associated with the CSI report configuration305(e.g., CMR resource set n, CSI-IM resource set m, and NZP-IMR resource sets) may include one or more resources (e.g., N number of resources). The UE115may evaluate the CSI report configuration305and may select at least one CMR resource out of the N resources included in the CMR resource set n. Each CMR resource may have an associated CSI-IM resource and may be collectively associated with all NZP resources from the activated NZP-IMR resource set335. For example, if the UE115selects NZP CMR resource n1, it may also select CSI-IM resource m1 and all NZP-IMR resources from NZP-IMR resource set s. If the UE115selects NZP CMR resource n2, it may also select CSI-IM resource m2 and all NZP-IMR resources from NZP-IMR resource sets. The UE115may include a CRI in the CSI report to indicate to the base station105which NZP CMR resource was used to generate the CSI report.

In some examples, the base station105may configure the UE115with one or more CSI report configurations305. The CSI resources selected by the UE115for each CSI report configuration305may occupy a number of CPUs. For example, the base station105may indicate a CSI report quantity of interest (e.g., cri-received signal received power (cri-RSRP), ssb-Index-RSRP, or a receive beam sweep), and the UE115may utilize a CPU to generate a CSI report associated with the quantity of interest. In some examples, the number of occupied CPUs may be equal to the number of NZP CMR resources included in the activated NZP CMR resource set325. In the example of CSI report framework300, the number of occupied CPUs for the CSI report configuration305may be two such that NZP CMR resource n1 may occupy a first CPU and NZP CMR resource n2 may occupy a second CPU. In some examples, the number of occupied CPUs may not be greater than the total number of CPUs associated with the UE115. If the number of occupied CPUs for the one or more CSI report configurations305is greater than the total number of CPUs associated with the UE115, the UE115may refrain from updating any additional CSI report configurations305. In some examples, the UE115may indicate, to the base station105, a total number of associated CPUs (e.g., via RRC signaling).

The UE115may also have associated capability metrics for a maximum number of active CSI-RS resources the UE115may support, and a maximum number of CSI-RS ports that may be occupied for the one or more CSI report configurations305. For example, if a UE is configured to generate a CSI-RS N times by one or more CSI reporting settings, the CSI-RS resource and the CSI-RS ports within the CSI-RS resource may be counted by the UE115N times. The UE115may transmit the capability metrics associated with the maximum number of active resources and active ports to the base station105(e.g., via RRC signaling).

In some examples, the UE115may determine to drop (e.g., refrain from transmitting) a CSI report generated for a CSI report configuration305. For example, the UE115may determine to drop a CSI report if the CSI report is transmitted on a PUCCH or a PUSCH that has a lower priority compared another overlapping uplink channel while multiplexing rules are not applicable. For example, a CSI report on a PUSCH or PUCCH may have an associated priority of 0 while another PUSCH or PUCCH may have an associated priority of 1, and as such the UE115may drop the CSI report. In some examples, the UE115may determine to drop a CSI report that is transmitted using a PUSCH due to the PUSCH being canceled (e.g., due to conflict or by the base station105). For instance, the UE115may receive a DCI which may include uplink calculation indication (e.g., DCI format 2_4) that may indicate to the UE115a set of uplink symbols to cancel, and if one or more symbols indicated overlap with the CSI report, the UE115may drop the CSI report. In some examples, the UE115may drop the CSI report if the CSI report is on a periodic PUCCH with flexible symbols. For instance, the UE115may receive a DCI that indicates that symbols initially intended to carry the CSI on the PUCCH have been changed to downlink symbols and the UE115may drop the CSI report (e.g., a DCI of format 1_0, 1_1, or 1_2 scheduling a PDSCH on flexibles symbols or a DCI of format 2_0 for SFI).

While the UE115may determine to drop a CSI report due to dropping the uplink channel carrying the CSI report or due to the priority of the CSI report, it may also be advantageous for the UE115to drop a CSI report if one or more CSI-RS resources are not received from the base station105. For example, the base station105may drop CMRs or NZP-IMRs as described with reference toFIG.2. If the UE115proceeds to generate a CSI report, despite the base station105dropping one or more CSI-RS resources, the UE115may use additional CPUs that would otherwise be unused as well as increase the number or active resources and CSI ports.

One or more aspects of the present disclosure provide for techniques to minimize the occupation of CPUs and the use of processing resources. According to aspects depicted herein, the UE115may determine to not transmit a CSI report based on one or more rules. The one or more rules may be indicated by a base station via a signal. The UE115may refrain from transmitting a CSI report (e.g., to a base station105) based on not receiving, from the base station105, one or more CSI resources included in the CSI report configuration305. In some examples, the UE115may determine to drop a CSI report if all CMRs associated with a CSI report are dropped. For example, if the base station105dropped both NZP CMR resource n1 and NZP CMR resource n2, the UE115may refrain from generating the associated CSI report. In some examples, the UE115may determine to drop a CSI report if at least one CMR associated with the CSI report is dropped. For instance, if the base station105dropped either NZP CMR resource n1 or NZP CMR resource n2, the UE115may refrain from generating a CSI report. In some examples, the UE115-amay determine to drop the CSI report if the number of dropped CMRs associated with the CSI report is greater than a configured threshold. For instance, if the base station105dropped both NZP CMR resource n1 and NZP CMR resource n2, and the configured threshold indicates to drop the CSI report if more than one associated CMR is dropped, then the UE115may drop the CSI report. Further description of the various rules used by the UE115to determine whether to generate and transmit a CSI report are described herein, including with reference toFIGS.4A-4C.

FIGS.4A-4Cillustrate examples of a CSI report generation400-a, a CSI report generation400-b, and a CSI report generation400-cthat support techniques for CSI reporting in accordance with aspects of the present disclosure. In some examples, the CSI report generation400-a, the CSI report generation400-b, and the CSI report generation400-cmay implement aspects of the wireless communications system100and the wireless communications system200. The CSI report generation400(e.g., CSI report generation400-a, CSI report generation400-b, and CSI report generation400-c) may include CSI-RS resource sets405(e.g., CSI-RS resource set405-a, CSI-RS resource set405-b, and CSI-RS resource set405-c) that may include multiple CSI-RS reference signals410(e.g., CSI-RS reference signal410-a, CSI-RS reference signal410-b, and CSI-RS reference signal410-c) that a base station105may transmit to a UE115for CSI report415(e.g., CSI report415-a, CSI report415-b, and CSI report415-c) generation. The UE115may determine, using a set of configured rules, to generate a CSI report415in accordance with receiving a subset of the anticipated CSI-RS resources410included in the CSI-RS resource set405. Generally, CSI report generations400-a-400-cillustrate various implementations of the rules configured at the UE115for determining whether to generate a CSI report415.

In accordance with the techniques described herein, the UE115may determine to drop (e.g., refrain from generating) a CSI report415if one or more CSI-RS resources410are not received (e.g., dropped) by the UE115. In some examples, the CSI-RS resources410may be CMRs which the UE115may use for channel measurements or may be NZP-INRs which the UE115may use of interference measurements. If the UE115determines to generate a CSI report415based on receiving one or more CSI-RS resources410from the base station105, the UE115may include the CSI report on a physical uplink channel420. In some examples, the physical uplink channel420may be a PUCCH if the UE115is operating in accordance with a periodic or a semi-persistent CSI report415generation. In some examples, the physical uplink channel420may be a PUSCH if the UE115is operating in accordance with an aperiodic or a semi-persistent CSI report415generation. In some implementations, the base station105may schedule a UE115to transmit a CSI report415in an uplink channel transmission. If the UE115determines to drop the CSI report415such that the physical uplink channel420is empty after dropping the CSI report415, the UE115may drop the entire physical uplink channel420along with the CSI report. In some other implementations, the UE115may transmit the CSI report415along with additional uplink control information (UCI) or additional uplink transport blocks and may determine to drop the CSI report. In such cases, the UE115may drop the CSI report415, and may transmit the physical uplink channel420with the additional UCI or uplink transport blocks. For example, the physical uplink channel420may carry additional CSI reports415corresponding to other CSI-RS resources410, HARQ-Acknowledgments, or various other uplink transport blocks.

In some examples, a CSI report415setting may include or indicate multiple CMRs associated with multiple CSI hypotheses (e.g., more than one CMR may be configured in a CSI-RS resource set405for the report setting). For example, CSI-RS resource set410-athrough CSI-RS resource set410-1may be examples of CMRs included in their respective CSI-RS resource sets405. In some examples, one or more CMRs may be dropped by the base station105during transmission of the CSI-resource set405. In such examples, the UE115may perform CSI operations according to one or more configured rules to determine whether to generate the CSI report405if one or more associated CMRs are dropped.

According to one or more aspects, a UE115may receive a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals (e.g., CSI-RS resource set405-a, CSI-RS resource set405-b, and CSI-RS resource set405-c). The UE115may evaluate one or more rules for generating a CSI report415when a received set of reference signals is less than the first set of reference signals. The UE115may then generate the CSI report415according to the one or more rules.

In some examples, the one or more rules may indicate that the UE115is to refrain from generating the CSI report415if none of the reference signals from the first set of reference signals are in the received set of reference signals. As depicted in the example ofFIG.4A, the UE115may determine to drop a CSI report415-aif all associated CMRs in CSI-RS resource set405-aare not received by the UE115or dropped by the base station105. For instance, CSI-RS resource410-athrough CSI-RS resource410-dmay be examples of CMRs (e.g., received set of reference signals) included in CSI-RS resource set405-a, and each of CSI-RS resources410-athrough CSI-RS resource410-dmay have been dropped by the base station105, as illustrated inFIG.4A. Due to all CMRs included in the CSI-RS resource set405-abeing dropped by the base station105-aor otherwise not received by the UE115, the UE115may refrain from generating (e.g., drop) the associated CSI report415-a. The UE115may determine that if there is at least one non-dropped CMR, then there is at least one CSI hypothesis. For the CSI report, the UE115may consider the non-dropped CMRs as valid CSI hypotheses. As such, the UE115may refrain from including the CSI report415-aon the physical uplink channel420-a. In some examples, if there is at least one non-dropped CMR, there is at least one CSI hypothesis that the UE115may use to generate the CSI report415-a. For example, if CSI-RS410-awas received by the UE115and is an example of a CMR, the UE115may generate the UE115CSI report415-abased on CSI-RS410-a. If the CSI report415-ais generated, a CRI included in the CSI report415-amay be associated with the one of the non-dropped CMRs.

In some examples, the one or more rules may indicate that the UE115is to refrain from generating the CSI report415if at least one reference signal from the first set of reference signals is missing from the received set of reference signals. As depicted in the example ofFIG.4B, the UE115may determine to generate a CSI report415-bbased on evaluating one or more rules and reporting based on the evaluation. As such, the UE115may determine to drop a CSI report415-bif at least one of the CMRs in CSI-RS resource set405-bis dropped by the base station105. For instance, CSI-RS resource410-ethrough CSI-RS resource410-hmay be examples of CMRs included in CSI-RS resource set405-b. The UE115may determine that since at least one CSI hypothesis cannot be evaluated, the CSI report does not correspond to the CSI request from the base station105(for UE to evaluate all hypotheses and report one). As illustrated inFIG.4B, CSI-RS410-fmay be dropped by the base station105or the UE115may not receive it, and as such the UE115may determine to refrain from generating (e.g., drop) the associated CSI report415-b. In the example ofFIG.4B, the UE115may refrain from including the CSI report415-bon the physical channel420-b.

In some examples, the one or more rules may indicate that the UE115is to refrain from generating the CSI report415if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals. In the example ofFIG.4C, the UE115may determine to generate a CSI report415-cbased on evaluating that the number of reference signals is greater than a configured threshold (according to the one or more rules) and the UE115may determine reporting of the CSI report415-cbased on the evaluation. As such, the UE115may determine to drop the CSI report415-cif the number of CMRs in CSI-RS resource set405-bdropped by the base station105is greater than the configured threshold. For instance, CSI-RS resource410-ithrough CSI-RS resource410-1may be examples of CMRs included in CSI-RS resource set405-c. As illustrated inFIG.4B, CSI-RS resource410-jand CSI-RS resource410-lare dropped by the base station105or otherwise not received by the UE115. If the configured threshold for the number of allowed dropped CMRs is one, then the UE115may determine to refrain from generating (e.g., drop) the associated CSI report415-c. In the example ofFIG.4C, the UE115may refrain from including the CSI report415-bon the physical channel420-c.

The UE115may determine to generate a CSI report415in accordance with the one or more rules described inFIGS.4A-4Cbased on the priority of the CSI. For example, if the priority of the CSI is relatively low (e.g., the priority is below a threshold configured by the network) the UE115may determine to operate in accordance with the techniques ofFIG.4B. If the priority of the CSI is relatively high (e.g., the priority is greater than or equal to the threshold configured by the network) the UE115may determine to operate in accordance with the techniques of eitherFIG.4A or4C. In some examples, the UE115may determine to generate a CSI report415in accordance with the one or more rules described inFIGS.4A-4Cbased on latency or reliability requirements configured by the network.

FIG.5illustrates an example of a downlink transmission timeline500that supports techniques for CSI reporting in accordance with aspects of the present disclosure. In some examples, downlink transmission timeline500may implement aspects of wireless communications system100, wireless communications system200, CSI report framework300, CSI report generation400, or a combination thereof. The downlink transmission timeline500may include multiple periodic or semi-persistent downlink transmissions510in which each transmissions may include a CSI-RS resource set505that a receiving device (e.g., UE) may use to generate an associated CSI report. The downlink transmission timeline500may be implemented by a UE115and a base station105, which may be examples of a UE115and a base station105as described with reference toFIGS.1and2.

In some examples of the downlink transmission timeline500, a base station105may transmit the multiple downlink transmissions510to a UE115. As such, the UE115may use one or more CMRs515included in a received CSI-RS resource set505to generate a CSI report to send in response to the base station105. The multiple downlink transmissions510may be transmitted on a periodic or semi-persistent basis and may have an associated periodicity520. In some examples, the CMRs515included in a CSI-RS resource set505for a given downlink transmission510may be dropped by the transmitting base station105. The reasons for the CMR515dropping are described herein, including with reference toFIG.2. As depicted herein, the UE115may evaluate whether to generate a CSI report based on one or more rules. In some examples, the one or more rules may include one or more rules for calculating a CPU occupation, the one or more rules for calculating the CPU occupation indicating that the UE is to calculate the CPU occupation as zero if at least one reference signal or at least a threshold number of reference signals are missing from a received set of reference signals.

The one or more rules may further include one or more rules for calculating the active resource occupation or the active port occupation indicating that the UE115is to refrain from including at least one reference signal in calculating the active resource occupation or the active port occupation during a time period if the at least one reference signal is missing from a received set of reference signals. In some examples, the at least one reference signal may include at least one of a periodic reference signal, an aperiodic reference signal, a semi-persistent reference signal, or a combination thereof. That is, if the UE115determines to drop a CSI report based on the CMR515dropping or not receiving the CMR515, then the one or more dropped CMRs515may not occupy a CPU for that CSI report setting. If, the UE115determines to generate a CSI report, but some of the CMRs515associated with the CSI report setting are dropped, then the number of occupied CPUs for the associated CSI report setting may correspond to the number of received CMRs515in a CSI-RS resource set505(e.g., the number of non-dropped CMRs515).

In the example of periodic or semi-persistent the CMRs515, the UE115may determine to refrain from counting the dropped CMRs515toward active resource and port occupation during that periodicity520of the downlink transmission510. For example, in the downlink transmission510-a, the CMR515-bmay be dropped by the base station105or otherwise not received by the UE115, and the UE115may refrain from counting the CMR515-btowards the number of active resources and active occupied ports for that periodicity520. In the downlink transmission510-b, all CMRs515may be received by the UE115, and the UE115may count all the CMRs515in downlink transmission510-btowards the active resources and the number of active ports. In the downlink transmission510-c, the CMR515-gand the CMR515-hmay be dropped by the base station105and the UE115may refrain from counting the CMR515-gand the CMR515-htowards the number of active resources and active ports for that periodicity520. In some examples of active resource and active port counting, each received CMR515may count towards one active resource and eight active ports. In such examples, for the downlink transmission510-a, the UE115may count two active resources and 16 active ports, for the downlink transmission510-bthe UE115may count three active resources and 24 active ports, and for the downlink transmission510-cthe UE115may count 1 active resource and 8 active ports.

In some examples, whether a UE115determines to count dropped CMRs515for a downlink transmission510may further depend on the reason for CMR515dropping. In examples of dynamic dropping (e.g., detection of a DCI at the UE115) which results in the dropping of one or more CMRs515, the dropped CMRs515may still count towards the CPU occupation, the active resources, the active port occupation, or a combination thereof. In examples of semi-static dropping (e.g., one or more CMRs515are dropped based on TDD configuration or other high-layer configurations), the UE115may refrain from counting the one or more dropped CMRs515towards CPU occupation, active resources, or active port occupation.

FIG.6illustrates an example of an NCJT CSI report generation600that supports techniques for CSI reporting in accordance with aspects of the present disclosure. In some examples, the NCJT CSI report generation600may implement aspects of the wireless communications system100and the wireless communications system200. The NCJT CSI report generation600may be implemented by a UE115and a base station105, which may be examples of a UE115and a base station105as described with reference toFIGS.1and2.

As depicted in the example ofFIG.6, the NCJT CSI report generation600may include multiple CMR groups605that may include multiple CMRs610. A base station105may transmit the CMRs610to a UE115for CSI report620generation. The UE115may determine, using a set of configured rules, to generate one or more CSI reports620in accordance with receiving a subset of the anticipated CMRs610included in the multiple CMR groups605. Generally, the NCJT CSI report generation600illustrates various implementations of the rules configured at the UE115for determining whether to generate one or more CSI reports620.

In the example of NCJT CSI report generation600, the UE115may determine to generate one or more CSI reports620that may be intended for a mTRP CSI. For example, an NCJT CSI report may relate to a CSI report620that is associated with a CMR pair615where each CMR610in the CMR pair615may have an associated TCI state and a respective TRP. For a CSI-RS resource set within a given CSI report setting the base station105may configure one or more CMR pairs615for one or more NCJT CSI hypotheses. For example, CMR pair615-amay include CMR610-aand CMR610-dand CMR pair615-bmay include CMR610-band CMR610-ein which CMR pair615-aand CMR pair615-bare associated with a respective NCJT hypothesis. The CMRs610may be divided into two CMR groups605such that each CMR pair615-aassociated with an NCJT hypothesis may include one CMR610from the CMR group605-aand one CMR610from the CMR group605-b. In some examples, out of N possible CMR pairs615the UE115may configure N different NCJT hypotheses.

In some examples, each CMR610may be used for both an NCJT hypothesis and a single-TRP hypothesis. Additionally or alternatively, each CMR610may be used for either an NCJT hypothesis or individually for a single-TRP hypothesis. For a given CSI report setting, the UE115may be configured with both NCJT hypotheses and sTRP hypotheses. For example, in the NCJT CSI report generation600, the CMR group605-aand the CMR group605-bmay be included in two NCJT hypotheses (e.g., CMR pair605-aand CMR pair605-b) and two single-TRP hypotheses (e.g., CMR610-cand CMR610-f) for a total of four CSI hypotheses.

To generate one or more CSI reports620, the UE115may operate in accordance with one or more options which may indicate how the UE115may generate the one or more CSI reports620. In one example (e.g., Option 1), the UE115may separate the NCJT hypotheses from the single-TRP hypotheses and may generate one CSI report620from the set of configured NCJT hypotheses. For example, the UE115may choose either the CMR pair615-aor the CMR pair615-bbased on the CMR pairs615satisfying one or more configured criteria for signal quality and use the chosen CMR pair605to generate an mTRP CSI report620. Additionally, or alternatively in this example, the UE115may configure an additional CSI report620for each single-TRP hypothesis. For instance, the UE115may generate a CSI report620associated with the CMR610-cand another CSI report620associated with the CMR610-ftotaling three CSI reports620(e.g., one NCJT CSI report and two sTRP CSI reports). In another example (e.g., Option 2), the UE115may generate one CSI report for the CSI hypothesis that satisfies one or more signal quality criteria configured at the UE115. For example, the UE115may choose from one of the four hypotheses as illustrated in NCJT CSI report generation600to generate one CSI report620.

In some cases of NCJT CSI report generation600, the base station105may drop one or more CSI-RS resources intended for one or more CSI report620generations. For example, the base station105may drop the CMR610-aand the CMR610-cin the CMR group605-aand the CMR610-ein the CMR group605-b. For an NCJT hypothesis associated with a CMR pair615in a given CSI report setting, if at least one of the two CMRs610is dropped, the UE115refrains from evaluating or considering the associated NCJT CSI hypothesis. For example, because the CMR610-ain the CMR pair615-amay be dropped by the base station105, the UE115may drop the NCJT hypothesis associated with the CMR pair615-aand refrain from counting CMR pair615-atoward the CPU occupation. If the CMR610-dis not configured in a CMR pair615other that the CMR pair615-aand is not configured as a single-TRP hypothesis, the UE115may also determine to drop the CMR610-d.

In cases in which the UE115determines to generate one CSI report620based on the CSI hypothesis that satisfies signal quality criteria (e.g., Option 2), the UE115may operate in accordance with a set of rules to determine whether to generate a CSI report620if the base station105drops one or more CMRs610. In one example, the UE115may determine to drop the one CSI report620if all associated CSI hypotheses are dropped. In the context NCJT CSI report generation600under this example, the UE115may determine to generate the CSI report620based on receiving CMR610-fwhich has an associated single-TRP CSI hypothesis. In another example, the UE115may determine to drop the one CSI report620if at least one associated CSI hypothesis is dropped. In the context of NCJT CSI report generation600under this example, the UE115may determine to refrain from generating the CSI report620based determining that the CMR pair615-a, the CMR pair615-b, and the CMR610-care dropped. In another example, the UE115may determine drop the CSI report620if the number of CSI hypothesis dropped is above a configured threshold. In the context of NCJT CSI report generation600under this example, the UE115may determine to refrain from generating the one CSI report620if the number of dropped CSI hypotheses (e.g., three) is greater than the configured threshold and may generate the one CSI report if the number of dropped CSI hypotheses is less than the configured threshold.

In cases where the UE115determines to generate a CSI report620per received CSI hypothesis (e.g., Option 1), the UE115may determine whether to generate each CSI report620based on receiving the respective CSI hypothesis. In the example of the CMR pair615-a, the UE115may determine to drop the CSI report620based on the associated NCJT hypothesis being dropped. In the example of the CMR pair615-b, the UE115may determine to drop the CSI report620based on the associated NCJT hypothesis being dropped. In the example of the CMR610-c, the UE115may determine to drop the associated CSI report620based on the associated single-TRP CSI hypothesis being dropped. In the example of the CMR610-f, the UE115may generate the associated CSI report620based on receiving the associated single-TRP CSI hypothesis. That is, of the four CSI report hypotheses, the UE115may determine to drop three of the associated CSI reports620and include one CSI report620on the physical uplink channel625. In some other examples, the UE115may determine to transmit one or more of the CSI reports620based on dropping other CSI hypotheses (e.g., the UE115refrains from partial dropping of CSI reports620). In one example, the UE115may refrain from generating any CSI reports620if all associated CSI hypotheses are dropped. In another example, the UE115may refrain from generating any CSI report620if at least one associated CSI hypotheses is dropped. In the context of NCJT CSI report generation600under this example, the UE115may refrain from generating any CSI report620based on at least the CMR pair615-a, the CMR pair615-b, or the CMR610-cbeing dropped. In another example, the UE115may refrain from generating any CSI report620if the number of dropped CSI hypotheses is above a configured threshold. In the context of NCJT CSI report generation600under this example, the UE115may refrain from generating the any CSI report620if the number of dropped CSI hypotheses (e.g., three) is greater than the configured threshold and may generate the CSI reports620associated with any received CSI hypotheses if the number of dropped CSI hypotheses is less than the configured threshold.

FIG.7illustrates an example of a process flow700that supports techniques for CSI reporting in accordance with aspects of the present disclosure. In some examples, the process flow700may implement aspects of the wireless communications system100and the wireless communications system200. Process flow700includes a UE115-band a base station105-b, which may be respective examples of a UE115and a base station105as described with reference toFIGS.1and2.

Alternative examples of the following may be implemented, where some steps are performed in a different order than described or are not performed at all. In some cases, steps may include additional features not mentioned below, or further steps may be added. In addition, while process flow700shows processes between a single base station105-band UE115-b, it should be understood that these processes may occur between any number of network devices.

At705, the UE115-bmay receive, from the base station105-b, a signal indicating a configuration for the UE115-bto report CSI corresponding to a first set of reference signals. In some examples, at least on reference signal of the set of reference signals may include a periodic reference signal, an aperiodic reference signal, a semi-persistent reference signal, or a combination thereof. In some examples, at least one reference signal from the first set of reference signals may be missing from the received set of reference signals. For example, a reference signal may be missing based on an LBT failure in unlicensed band, an uplink and downlink symbol conflict, a resource overlap with a downlink channel, or a combination thereof. An uplink and downlink symbol conflict may be based on detection of a DCI scheduling an uplink signal, an SFI, an overlap between a PRACH occasion and a gap symbol prior to the PRACH occasion, or a combination thereof. A resource overlap with the downlink channel may be determined based on a channel type, a priority of the downlink channel compared to a priority of the CSI resource, a scheduling of the downlink channel, or a combination thereof.

At710, the UE115-bmay evaluate one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals. In some examples, the one or more rules may indicate that the UE115-bmay refrain from generating the CSI report if none of the reference signals from the first set of reference signals are in the received set of reference signals. In some examples, the one or more rules may indicate that the UE115-bmay refrain from generating the CSI report if at least one reference signal from the first set of reference signals is missing from the received set of reference signals. In some examples, the one or more rules may indicate that the UE115-bmay refrain from generating the CSI report if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals.

In some examples, the one or more rules may indicate to the UE115-bto calculate the CPU occupation based on the received set of reference signals if at least one reference signal from the first set of reference signals is missing from the received set of reference signals. In some examples, the rules for calculating the CPU occupation may indicate that the UE115-bmay calculate the CPU occupation as zero if at least one reference signal from the first set of reference signals is missing from the received set of reference signals. In some examples, the rules may indicate that the UE115-bmay calculate the CSI processing unit occupation based on the received set of reference signals if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals.

In some examples, the one or more rules may include one or more rules for calculating an active resource occupation or an active port occupation. For example, the one or more rules may indicate that the UE115-bmay refrain from including at least one reference signal in calculating the active resource occupation or the active port occupation during a time period if the at least one reference signal from the first set of reference signals is missing from the received set of reference signals. In some examples, the one or more rules for calculating the active resource occupation may indicate to the UE115-bto refrain from including at least one reference signal in calculating the active resource occupation if the at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

In some examples, a first CSI hypothesis may correspond to a reference signal from the first set of reference signals and a second CSI hypothesis may correspond to a pair of reference signals from the first set of reference signals. In such examples, the one or more rules may indicate that the UE115-bmay refrain from evaluating the second CSI hypothesis if a first reference signal from the pair of reference signals is missing from the received set of reference signals. In some examples, the one or more rules indicate that the UE115-bis to refrain from evaluating the second CSI hypothesis if a second reference signal from the pair of reference signals does not correspond to the first CSI hypothesis or is not included in a second pair of reference signals corresponding to the second CSI hypothesis.

In some examples, the one or more rules may indicate that the UE115-bmay refrain from generating the CSI report if the reference signal from the first set of reference signals and a second reference signal from the pair of reference signals are missing from the received set of reference signals. In some examples, the one or more rules may indicate that the UE115-bmay refrain from generating the CSI report if the at least one of the reference signal from the first set of reference signals and a second reference signal from the pair of reference signals are missing from the received set of reference signals. In some examples, the one or more rules may indicate that the UE115-bmay refrain from generating the CSI report if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals, the threshold number of reference signals corresponding to the first CSI hypothesis, or the second CSI hypothesis, or both.

In some examples, the one or more rules may indicate that the UE115-bmay refrain from generating the CSI report if at least one reference signal from the first set of reference signals is missing from the received set of reference signals and that the UE115-bmay generate a plurality of CSI reports corresponding to a remaining number of reference signals of the first set of reference signals.

In some examples, the one or more rules indicate that the UE115-bis to refrain from transmitting an uplink channel if the UE115-brefrains from generating the CSI report. In some examples, the one or more rules indicate that the UE115-bis to transmit an uplink channel including an UCI or an uplink transport block if the UE115-brefrains from generating the CSI report.

At715, the UE115-bmay perform CSI operations according to the one or more rules evaluated by the UE115-bat710. For example, the UE115-bmay determine whether to generate and transmit a CSI report based on the one or more rules. In some cases, as described above, the process of performing CSI operations may include determining not to generate CSI report based on the rules.

The communications manager820, the receiver810, the transmitter815, or various combinations thereof or various components thereof may be examples of means for performing various aspects of techniques for CSI reporting as described herein. For example, the communications manager820, the receiver810, the transmitter815, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

In some examples, the communications manager820may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver810, the transmitter815, or both. For example, the communications manager820may receive information from the receiver810, send information to the transmitter815, or be integrated in combination with the receiver810, the transmitter815, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager820may support wireless communications at a UE in accordance with examples as disclosed herein. For example, the communications manager820may be configured as or otherwise support a means for receiving, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals. The communications manager820may be configured as or otherwise support a means for evaluating one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals. The communications manager820may be configured as or otherwise support a means for performing CSI operations according to the one or more rules.

By including or configuring the communications manager820in accordance with examples as described herein, the device805(e.g., a processor controlling or otherwise coupled to the receiver810, the transmitter815, the communications manager820, or a combination thereof) may support techniques for reduced power consumption at CPUs, more efficient utilization of CSI resources for CSI report generation, decrease in resource port occupations.

The device905, or various components thereof, may be an example of means for performing various aspects of techniques for CSI reporting as described herein. For example, the communications manager920may include a configuration identification component925, an evaluation component930, a CSI report generation component935, or any combination thereof. The communications manager920may be an example of aspects of a communications manager820as described herein. In some examples, the communications manager920, or various components thereof, may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver910, the transmitter915, or both. For example, the communications manager920may receive information from the receiver910, send information to the transmitter915, or be integrated in combination with the receiver910, the transmitter915, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager920may support wireless communications at a UE in accordance with examples as disclosed herein. The configuration identification component925may be configured as or otherwise support a means for receiving, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals. The evaluation component930may be configured as or otherwise support a means for evaluating one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals. The CSI report generation component935may be configured as or otherwise support a means for performing CSI operations according to the one or more rules.

FIG.10shows a block diagram1000of a communications manager1020that supports techniques for CSI reporting in accordance with aspects of the present disclosure. The communications manager1020may be an example of aspects of a communications manager820, a communications manager920, or both, as described herein. The communications manager1020, or various components thereof, may be an example of means for performing various aspects of techniques for CSI reporting as described herein. For example, the communications manager1020may include a configuration identification component1025, an evaluation component1030, a CSI report generation component1035, or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The communications manager1020may support wireless communications at a UE in accordance with examples as disclosed herein. The configuration identification component1025may be configured as or otherwise support a means for receiving, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals. The evaluation component1030may be configured as or otherwise support a means for evaluating one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals. The CSI report generation component1035may be configured as or otherwise support a means for performing CSI operations according to the one or more rules.

In some examples, the one or more rules indicate that the UE is to refrain from generating the CSI report if none of the reference signals from the first set of reference signals are in the received set of reference signals. In some examples, the one or more rules indicate that the UE is to refrain from generating the CSI report if at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

In some examples, the one or more rules indicate that the UE is to refrain from generating the CSI report if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals. In some examples, the one or more rules include one or more rules for calculating a CPU occupation, the one or more rules for calculating the CPU occupation indicating that the UE is to calculate the CPU occupation as zero if at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

In some examples, the one or more rules include one or more rules for calculating a CPU occupation, the one or more rules for calculating the CPU occupation indicating that the UE is to calculate the CPU occupation based on the received set of reference signals if at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

In some examples, the one or more rules include one or more rules for calculating a CPU occupation, the one or more rules for calculating the CPU occupation indicating that the UE is to calculate the CPU occupation based on the received set of reference signals if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals.

In some examples, the one or more rules include one or more rules for calculating an active resource occupation or an active port occupation, the one or more rules for calculating the active resource occupation or the active port occupation indicating that the UE is to refrain from including at least one reference signal in calculating the active resource occupation or the active port occupation during a time period if the at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

In some examples, the at least one reference signal includes at least one of a periodic reference signal, an aperiodic reference signal, a semi-persistent reference signal, or a combination thereof. In some examples, the one or more rules include one or more rules for calculating an active resource occupation, the one or more rules for calculating the active resource occupation indicating that the UE is to refrain from including at least one reference signal in calculating the active resource occupation if the at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

In some examples, a first CSI hypothesis corresponds to a reference signal from the first set of reference signals and a second CSI hypothesis corresponds to a pair of reference signals from the first set of reference signals. In some examples, the one or more rules indicate that the UE is to refrain from evaluating the second CSI hypothesis if a first reference signal from the pair of reference signals is missing from the received set of reference signals.

In some examples, the one or more rules indicate that the UE is to refrain from evaluating the second CSI hypothesis if a second reference signal from the pair of reference signals does not correspond to the first CSI hypothesis or is not included in a second pair of reference signals corresponding to the second CSI hypothesis.

In some examples, the one or more rules indicate that the UE is to refrain from generating the CSI report if the reference signal from the first set of reference signals and a second reference signal from the pair of reference signals are missing from the received set of reference signals. In some examples, the one or more rules indicate that the UE is to refrain from generating the CSI report if the at least one of the reference signal from the first set of reference signals and a second reference signal from the pair of reference signals are missing from the received set of reference signals.

In some examples, the one or more rules indicate that the UE is to refrain from generating the CSI report if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals, the threshold number of reference signals corresponding to the first CSI hypothesis, or the second CSI hypothesis, or both.

In some examples, the one or more rules indicate that the UE is to refrain from generating the CSI report if at least one reference signal from the first set of reference signals is missing from the received set of reference signals and that the UE is to generate a set of multiple CSI reports corresponding to a remaining number of reference signals of the first set of reference signals.

In some examples, the one or more rules indicate that the UE is to refrain from transmitting an uplink channel if the UE refrains from generating the CSI report. In some examples, the one or more rules indicate that the UE is to transmit an uplink channel including an UCI or an uplink transport block if the UE refrains from generating the CSI report.

In some examples, at least one reference signal from the first set of reference signals is missing from the received set of reference signals based on a listen before talk failure in unlicensed band, an uplink and downlink symbol conflict, a resource overlap with a downlink channel, or a combination thereof.

In some examples, the uplink and downlink symbol conflict is based on detection of at least one of a downlink control information scheduling uplink signal, a slot format indicator, an overlap between a physical random access channel occasion and a gap symbol prior to the physical random access channel occasion, or a combination thereof. In some examples, the resource overlap with the downlink channel is determined based on a channel type, a priority of downlink channel compared to a priority of the CSI resource, a scheduling of the downlink channel, or a combination thereof.

FIG.11shows a diagram of a system1100including a device1105that supports techniques for CSI reporting in accordance with aspects of the present disclosure. The device1105may be an example of or include the components of a device805, a device905, or a UE115as described herein. The device1105may communicate wirelessly with one or more base stations105, UEs115, or any combination thereof. The device1105may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager1120, an input/output (I/O) controller1110, a transceiver1115, an antenna1125, a memory1130, code1135, and a processor1140. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus1145).

The I/O controller1110may manage input and output signals for the device1105. The I/O controller1110may also manage peripherals not integrated into the device1105. In some cases, the I/O controller1110may represent a physical connection or port to an external peripheral. In some cases, the I/O controller1110may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, the I/O controller1110may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller1110may be implemented as part of a processor, such as the processor1140. In some cases, a user may interact with the device1105via the I/O controller1110or via hardware components controlled by the I/O controller1110.

The memory1130may include random access memory (RAM) and read-only memory (ROM). The memory1130may store computer-readable, computer-executable code1135including instructions that, when executed by the processor1140, cause the device1105to perform various functions described herein. The code1135may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code1135may not be directly executable by the processor1140but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the memory1130may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor1140may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor1140may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the processor1140. The processor1140may be configured to execute computer-readable instructions stored in a memory (e.g., the memory1130) to cause the device1105to perform various functions (e.g., functions or tasks supporting techniques for CSI reporting). For example, the device1105or a component of the device1105may include a processor1140and memory1130coupled to the processor1140, the processor1140and memory1130configured to perform various functions described herein.

The communications manager1120may support wireless communications at a UE in accordance with examples as disclosed herein. For example, the communications manager1120may be configured as or otherwise support a means for receiving, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals. The communications manager1120may be configured as or otherwise support a means for evaluating one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals. The communications manager1120may be configured as or otherwise support a means for performing CSI operations according to the one or more rules.

By including or configuring the communications manager1120in accordance with examples as described herein, the device1105may support techniques for a decrease in physical channel occupation by CSI reports, reduced signaling overhead for transmissions associated with CSI, reduced power consumption at CPUs, improved channel estimation coordination between network device, and improved utilization of port occupation.

In some examples, the communications manager1120may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver1115, the one or more antennas1125, or any combination thereof. Although the communications manager1120is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager1120may be supported by or performed by the processor1140, the memory1130, the code1135, or any combination thereof. For example, the code1135may include instructions executable by the processor1140to cause the device1105to perform various aspects of techniques for CSI reporting as described herein, or the processor1140and the memory1130may be otherwise configured to perform or support such operations.

At1205, the method may include receiving, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals. The operations of1205may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1205may be performed by a configuration identification component1025as described with reference toFIG.10.

At1210, the method may include evaluating one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals. The operations of1210may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1210may be performed by an evaluation component1030as described with reference toFIG.10.

At1215, the method may include performing CSI operations according to the one or more rules. The operations of1215may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1215may be performed by a CSI report generation component1035as described with reference toFIG.10.

Aspect 1: A method for wireless communications at a UE, comprising: receiving, from a base station, a signal indicating a configuration for the UE to report CSI corresponding to a first set of reference signals; evaluating one or more rules for generating a CSI report where the one or more rules are associated with CSI report generation for when a received set of reference signals is less than the first set of reference signals; and performing CSI operations according to the one or more rules.

Aspect 2: The method of aspect 1, wherein the one or more rules indicate that the UE is to refrain from generating the CSI report if none of the reference signals from the first set of reference signals are in the received set of reference signals.

Aspect 3: The method of any of aspects 1 through 2, wherein the one or more rules indicate that the UE is to refrain from generating the CSI report if at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

Aspect 4: The method of any of aspects 1 through 3, wherein the one or more rules indicate that the UE is to refrain from generating the CSI report if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals.

Aspect 5: The method of any of aspects 1 through 4, wherein the one or more rules comprise one or more rules for calculating a CPU occupation, the one or more rules for calculating the CPU occupation indicating that the UE is to calculate the CPU occupation as zero if at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

Aspect 6: The method of any of aspects 1 through 5, wherein the one or more rules comprise one or more rules for calculating a CPU occupation, the one or more rules for calculating the CPU occupation indicating that the UE is to calculate the CPU occupation based at least in part on the received set of reference signals if at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

Aspect 7: The method of any of aspects 1 through 6, wherein the one or more rules comprise one or more rules for calculating a CPU occupation, the one or more rules for calculating the CPU occupation indicating that the UE is to calculate the CPU occupation based at least in part on the received set of reference signals if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals.

Aspect 8: The method of any of aspects 1 through 7, wherein the one or more rules comprise one or more rules for calculating an active resource occupation or an active port occupation, the one or more rules for calculating the active resource occupation or the active port occupation indicating that the UE is to refrain from including at least one reference signal in calculating the active resource occupation or the active port occupation during a time period if the at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

Aspect 9: The method of aspect 8, wherein the at least one reference signal comprises at least one of a periodic reference signal, an aperiodic reference signal, a semi-persistent reference signal, or a combination thereof.

Aspect 10: The method of any of aspects 1 through 9, wherein the one or more rules comprise one or more rules for calculating an active resource occupation, the one or more rules for calculating the active resource occupation indicating that the UE is to refrain from including at least one reference signal in calculating the active resource occupation if the at least one reference signal from the first set of reference signals is missing from the received set of reference signals.

Aspect 11: The method of any of aspects 1 through 10, wherein a first CSI hypothesis corresponds to a reference signal from the first set of reference signals and a second CSI hypothesis corresponds to a pair of reference signals from the first set of reference signals.

Aspect 12: The method of aspect 11, wherein the one or more rules indicate that the UE is to refrain from evaluating the second CSI hypothesis if a first reference signal from the pair of reference signals is missing from the received set of reference signals.

Aspect 13: The method of aspect 12, wherein the one or more rules indicate that the UE is to refrain from evaluating the second CSI hypothesis if a second reference signal from the pair of reference signals does not correspond to the first CSI hypothesis or is not included in a second pair of reference signals corresponding to the second CSI hypothesis.

Aspect 14: The method of any of aspects 11 through 13, wherein the one or more rules indicate that the UE is to refrain from generating the CSI report if the reference signal from the first set of reference signals and a second reference signal from the pair of reference signals are missing from the received set of reference signals.

Aspect 15: The method of any of aspects 11 through 14, wherein the one or more rules indicate that the UE is to refrain from generating the CSI report if the at least one of the reference signal from the first set of reference signals and a second reference signal from the pair of reference signals are missing from the received set of reference signals.

Aspect 16: The method of any of aspects 11 through 15, wherein the one or more rules indicate that the UE is to refrain from generating the CSI report if at least a threshold number of reference signals from the first set of reference signals is missing from the received set of reference signals, the threshold number of reference signals corresponding to the first CSI hypothesis, or the second CSI hypothesis, or both.

Aspect 17: The method of any of aspects 1 through 16, wherein the one or more rules indicate that the UE is to refrain from generating the CSI report if at least one reference signal from the first set of reference signals is missing from the received set of reference signals and that the UE is to generate a plurality of CSI reports corresponding to a remaining number of reference signals of the first set of reference signals.

Aspect 18: The method of any of aspects 1 through 17, wherein the one or more rules indicate that the UE is to refrain from transmitting an uplink channel if the UE refrains from generating the CSI report.

Aspect 19: The method of any of aspects 1 through 18, wherein the one or more rules indicate that the UE is to transmit an uplink channel including an uplink control information or an uplink transport block if the UE refrains from generating the CSI report.

Aspect 20: The method of any of aspects 1 through 19, wherein at least one reference signal from the first set of reference signals is missing from the received set of reference signals based at least in part on a listen before talk failure in unlicensed band, an uplink and downlink symbol conflict, a resource overlap with a downlink channel, or a combination thereof.

Aspect 21: The method of aspect 20, wherein the uplink and downlink symbol conflict is based at least in part on detection of at least one of a DCI scheduling uplink signal, a slot format indicator, an overlap between a PRACH occasion and a gap symbol prior to the PRACH occasion, or a combination thereof.

Aspect 22: The method of any of aspects 20 through 21, wherein the resource overlap with the downlink channel is determined based at least in part on a channel type, a priority of downlink channel compared to a priority of the CSI resource, a scheduling of the downlink channel, or a combination thereof.