Techniques and apparatuses for determining uplink transmission timelines related to a channel state information reference signal (CSI-RS)

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station (BS), a transmission of a channel state information reference signal (CSI-RS), wherein the transmission of the CSI-RS is received at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE. The UE may determine an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the CSI-RS. Numerous other aspects are provided.

This application claims priority to Greek Patent Application No. 20180100204, filed on May 11, 2018, entitled “TECHNIQUES AND APPARATUSES FOR DETERMINING UPLINK TRANSMISSION TIMELINES RELATED TO A CHANNEL STATE INFORMATION REFERENCE SIGNAL (CSI-RS)” which is hereby expressly incorporated by reference herein.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication, and more particularly to techniques and apparatuses for determining uplink transmission timelines related to a channel state information reference signal (CSI-RS).

BACKGROUND

SUMMARY

In some aspects, a method of wireless communication, performed by a user equipment (UE), may include receiving, from a base station (BS), a transmission of a channel state information reference signal (CSI-RS), wherein the transmission of the CSI-RS is received at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE; and determining an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the CSI-RS.

In some aspects, a UE for wireless communication may include memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to receive, from a BS, a transmission of a CSI-RS, wherein the transmission of the CSI-RS is received at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE; and determine an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the CSI-RS.

In some aspects, a method of wireless communication, performed by a BS, may include transmitting, to a UE, a transmission of a CSI-RS, wherein the transmission of the CSI-RS is transmitted at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE; and determining an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the CSI-RS.

In some aspects, a BS for wireless communication may include memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to transmit, to a UE, a transmission of a CSI-RS, wherein the transmission of the CSI-RS is transmitted at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE; and determine an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the CSI-RS.

In some aspects, a method of wireless communication, performed by a UE, may include receiving, from a BS, a transmission of an aperiodic channel state information reference signal (A-CSI-RS), wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS. The method may include determining an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the A-CSI-RS.

In some aspects, a user equipment for wireless communication may include memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to receive, from a BS, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS. The memory and the one or more processors may be configured to determine an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the A-CSI-RS.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to receive, from a BS, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS. The one or more instructions, when executed by the one or more processors, may cause the one or more processors to determine an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the A-CSI-RS.

In some aspects, an apparatus for wireless communication may include means for receiving, from a BS, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the apparatus and relative to one or more other transmissions of the A-CSI-RS. The apparatus may include means for determining an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the A-CSI-RS.

In some aspects, a method of wireless communication, performed by a UE, may include receiving, from a BS, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition. The method may include determining that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was received.

In some aspects, a user equipment for wireless communication may include memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to receive, from a BS, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition. The memory and the one or more processors may be configured to determine that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was received.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a user equipment, may cause the one or more processors to receive, from a BS, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition. The one or more instructions, when executed by the one or more processors, may cause the one or more processors to determine that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was received.

In some aspects, an apparatus for wireless communication may include means for receiving, from a BS, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition. The apparatus may include means for determining that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was received.

In some aspects, a method of wireless communication, performed by a BS, may include transmitting, to a UE, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS. The method may include determining an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the A-CSI-RS.

In some aspects, a base station for wireless communication may include memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to transmit, to a UE, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS. The memory and the one or more processors may be configured to determine an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the A-CSI-RS.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to transmit, to a UE, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS. The one or more instructions, when executed by the one or more processors, may cause the one or more processors to determine an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the A-CSI-RS.

In some aspects, an apparatus for wireless communication may include means for transmitting, to a UE, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS. The apparatus may include means for determining an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the A-CSI-RS.

In some aspects, a method of wireless communication, performed by a BS, may include transmitting, to a UE, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition. The method may include determining that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was transmitted based at least in part on transmitting the set of CSI-RS resources.

In some aspects, a base station for wireless communication may include memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to transmit, to a UE, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition. The memory and the one or more processors may be configured to determine that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was transmitted based at least in part on transmitting the set of CSI-RS resources.

In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to transmit, to a UE, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition. The one or more instructions, when executed by the one or more processors, may cause the one or more processors to determine that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was transmitted based at least in part on transmitting the set of CSI-RS resources.

In some aspects, an apparatus for wireless communication may include means for transmitting, to a UE, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition. The apparatus may include means for determining that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was transmitted based at least in part on transmitting the set of CSI-RS resources.

DETAILED DESCRIPTION

As indicated above,FIG. 1is provided merely as an example. Other examples may differ from what is described with regard toFIG. 1.

In some aspects, one or more components of UE120may be included in a housing. Controller/processor240of base station110, controller/processor280of UE120, and/or any other component(s) ofFIG. 2may perform one or more techniques associated with determining timelines related to an A-CSI-RS, a CSI-RS, a set of CSI-RS resources, and/or the like, as described in more detail elsewhere herein. For example, controller/processor240of base station110, controller/processor280of UE120, and/or any other component(s) ofFIG. 2may perform or direct operations of, for example, process1100ofFIG. 11, process1200ofFIG. 12, process1300ofFIG. 13, process1400ofFIG. 14, process1500ofFIG. 15, process1600ofFIG. 16, and/or other processes as described herein. Memories242and282may store data and program codes for base station110and UE120, respectively. A scheduler246may schedule UEs for data transmission on the downlink and/or uplink.

In some aspects, UE120may include means for receiving, from a base station, a transmission of an aperiodic channel state information reference signal (A-CSI-RS), means for determining an uplink transmit beam for a scheduled uplink transmission based at least in part on receiving the transmission of the A-CSI-RS, and/or the like. In some aspects, such means may include one or more components of UE120described in connection withFIG. 2.

Additionally, or alternatively, UE120may include means for receiving, from a base station, a set of channel state information reference signal (CSI-RS) resources, means for determining that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was received, and/or the like. In some aspects, such means may include one or more components of UE120described in connection withFIG. 2.

Additionally, or alternatively, UE120may include means for receiving, from a base station (BS), a transmission of a channel state information reference signal (CSI-RS), wherein the transmission of the CSI-RS is received at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE; means for determining an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the CSI-RS; and/or the like. In some aspects, such means may include one or more components of UE120described in connection withFIG. 2.

In some aspects, base station110may include means for transmitting, to a user equipment, a transmission of an A-CSI-RS, means for determining an uplink receive beam for a scheduled uplink transmission based at least in part on transmitting the transmission of the A-CSI-RS, and/or the like. In some aspects, such means may include one or more components of base station110described in connection withFIG. 2.

Additionally, or alternatively, base station110may further include means for transmitting, to a user equipment, a set of CSI-RS resources, means for determining that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was transmitted based at least in part on transmitting the set of CSI-RS resources, and/or the like. In some aspects, such means may include one or more components of base station110described in connection withFIG. 2.

Additionally, or alternatively, base station110may further include means for transmitting, to a UE, a transmission of a CSI-RS, wherein the transmission of the CSI-RS is transmitted at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE; means for determining an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the CSI-RS; and/or the like. In some aspects, such means may include one or more components of base station110described in connection withFIG. 2.

As indicated above,FIG. 2is provided merely as an example. Other examples may differ from what is described with regard toFIG. 2.

FIG. 3Ashows an example frame structure300for frequency division duplex (FDD) in a telecommunications system (e.g., NR). The transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames (sometimes referred to as frames). Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be partitioned into a set of Z (Z≥1) subframes (e.g., with indices of 0 through Z-1). Each subframe may have a predetermined duration (e.g., 1 ms) and may include a set of slots (e.g., 2mslots per subframe are shown inFIG. 3A, where m is a numerology used for a transmission, such as 0, 1, 2, 3, 4, and/or the like). Each slot may include a set of L symbol periods. For example, each slot may include fourteen symbol periods (e.g., as shown inFIG. 3A), seven symbol periods, or another number of symbol periods. In a case where the subframe includes two slots (e.g., when m=1), the subframe may include 2L symbol periods, where the 2L symbol periods in each subframe may be assigned indices of 0 through 2L-1. In some aspects, a scheduling unit for the FDD may frame-based, subframe-based, slot-based, symbol-based, and/or the like.

In certain telecommunications (e.g., NR), a base station may transmit synchronization signals. For example, a base station may transmit a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and/or the like, on the downlink for each cell supported by the base station. The PSS and SSS may be used by UEs for cell search and acquisition. For example, the PSS may be used by UEs to determine symbol timing, and the SSS may be used by UEs to determine a physical cell identifier, associated with the base station, and frame timing. The base station may also transmit a physical broadcast channel (PBCH). The PBCH may carry some system information, such as system information that supports initial access by UEs.

In some aspects, the base station may transmit the PSS, the SSS, and/or the PBCH in accordance with a synchronization communication hierarchy (e.g., a synchronization signal (SS) hierarchy) including multiple synchronization communications (e.g., SS blocks), as described below in connection withFIG. 3B.

FIG. 3Bis a block diagram conceptually illustrating an example SS hierarchy, which is an example of a synchronization communication hierarchy. As shown inFIG. 3B, the SS hierarchy may include an SS burst set, which may include a plurality of SS bursts (identified as SS burst0through SS burst B-1, where B is a maximum number of repetitions of the SS burst that may be transmitted by the base station). As further shown, each SS burst may include one or more SS blocks (identified as SS block0through SS block (bmax_SS-1), where bmax_SS-1is a maximum number of SS blocks that can be carried by an SS burst). In some aspects, different SS blocks may be beam-formed differently. An SS burst set may be periodically transmitted by a wireless node, such as every X milliseconds, as shown inFIG. 3B. In some aspects, an SS burst set may have a fixed or dynamic length, shown as Y milliseconds inFIG. 3B.

The SS burst set shown inFIG. 3Bis an example of a synchronization communication set, and other synchronization communication sets may be used in connection with the techniques described herein. Furthermore, the SS block shown inFIG. 3Bis an example of a synchronization communication, and other synchronization communications may be used in connection with the techniques described herein.

In some aspects, an SS block includes resources that carry the PSS, the SSS, the PBCH, and/or other synchronization signals (e.g., a tertiary synchronization signal (TSS)) and/or synchronization channels. In some aspects, multiple SS blocks are included in an SS burst, and the PSS, the SSS, and/or the PBCH may be the same across each SS block of the SS burst. In some aspects, a single SS block may be included in an SS burst. In some aspects, the SS block may be at least four symbol periods in length, where each symbol carries one or more of the PSS (e.g., occupying one symbol), the SSS (e.g., occupying one symbol), and/or the PBCH (e.g., occupying two symbols).

In some aspects, the symbols of an SS block are consecutive, as shown inFIG. 3B. In some aspects, the symbols of an SS block are non-consecutive. Similarly, in some aspects, one or more SS blocks of the SS burst may be transmitted in consecutive radio resources (e.g., consecutive symbol periods) during one or more slots. Additionally, or alternatively, one or more SS blocks of the SS burst may be transmitted in non-consecutive radio resources.

In some aspects, the SS bursts may have a burst period, whereby the SS blocks of the SS burst are transmitted by the base station according to the burst period. In other words, the SS blocks may be repeated during each SS burst. In some aspects, the SS burst set may have a burst set periodicity, whereby the SS bursts of the SS burst set are transmitted by the base station according to the fixed burst set periodicity. In other words, the SS bursts may be repeated during each SS burst set.

The base station may transmit system information, such as system information blocks (SIBs) on a physical downlink shared channel (PDSCH) in certain slots. The base station may transmit control information/data on a physical downlink control channel (PDCCH) in C symbol periods of a slot, where B may be configurable for each slot. The base station may transmit traffic data and/or other data on the PDSCH in the remaining symbol periods of each slot.

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

FIG. 4shows an example slot format410with a normal cyclic prefix. The available time frequency resources may be partitioned into resource blocks. Each resource block may cover a set of subcarriers (e.g., 12 subcarriers) in one slot and may include a number of resource elements. Each resource element may cover one subcarrier in one symbol period (e.g., in time) and may be used to send one modulation symbol, which may be a real or complex value.

A UE may be located within the coverage of multiple BSs. One of these BSs may be selected to serve the UE. The serving BS may be selected based at least in part on various criteria such as received signal strength, received signal quality, path loss, and/or the like. Received signal quality may be quantified by a signal-to-interference-and-noise ratio (SINR), or a reference signal received quality (RSRQ), or some other metric. The UE may operate in a dominant interference scenario in which the UE may observe high interference from one or more interfering BSs.

In some aspects, a single component carrier bandwidth of 100 MHz may be supported. NR resource blocks may span 12 sub-carriers with a sub-carrier bandwidth of 60 or 120 kilohertz (kHz) over a 0.1 millisecond (ms) duration. Each radio frame may include 40 slots and may have a length of 10 ms. Consequently, each slot may have a length of 0.25 ms. Each slot may indicate a link direction (e.g., DL or UL) for data transmission and the link direction for each slot may be dynamically switched. Each slot may include DL/UL data as well as DL/UL control data.

As indicated above,FIG. 4is provided as an example. Other examples may differ from what is described with regard toFIG. 4.

FIG. 5is a diagram500illustrating an example of a DL-centric slot or wireless communication structure. The DL-centric slot may include a control portion502. The control portion502may exist in the initial or beginning portion of the DL-centric slot. The control portion502may include various scheduling information and/or control information corresponding to various portions of the DL-centric slot. In some configurations, the control portion502may be a physical DL control channel (PDCCH), as indicated inFIG. 5. In some aspects, the control portion502may include legacy PDCCH information, shortened PDCCH (sPDCCH) information), a control format indicator (CFI) value (e.g., carried on a physical control format indicator channel (PCFICH)), one or more grants (e.g., downlink grants, uplink grants, and/or the like), and/or the like.

The DL-centric slot may also include a DL data portion504. The DL data portion504may sometimes be referred to as the payload of the DL-centric slot. The DL data portion504may include the communication resources utilized to communicate DL data from the scheduling entity (e.g., UE or BS) to the subordinate entity (e.g., UE). In some configurations, the DL data portion504may be a physical DL shared channel (PD SCH).

The DL-centric slot may also include an UL short burst portion506. The UL short burst portion506may sometimes be referred to as an UL burst, an UL burst portion, a common UL burst, a short burst, an UL short burst, a common UL short burst, a common UL short burst portion, and/or various other suitable terms. In some aspects, the UL short burst portion506may include one or more reference signals. Additionally, or alternatively, the UL short burst portion506may include feedback information corresponding to various other portions of the DL-centric slot. For example, the UL short burst portion506may include feedback information corresponding to the control portion502and/or the data portion504. Non-limiting examples of information that may be included in the UL short burst portion506include an ACK signal (e.g., a physical uplink control channel (PUCCH) ACK, a physical uplink shared channel (PUSCH) ACK, an immediate ACK), a NACK signal (e.g., a PUCCH NACK, a PUSCH NACK, an immediate NACK), a scheduling request (SR), a buffer status report (BSR), a hybrid automatic repeat request (HARD) indicator, a channel state indication (CSI), a channel quality indicator (CQI), a sounding reference signal (SRS), a demodulation reference signal (DMRS), PUSCH data, and/or various other suitable types of information. The UL short burst portion506may include additional or alternative information, such as information pertaining to random access channel (RACH) procedures, scheduling requests, and various other suitable types of information.

As illustrated inFIG. 5, the end of the DL data portion504may be separated in time from the beginning of the UL short burst portion506. This time separation may sometimes be referred to as a gap, a guard period, a guard interval, and/or various other suitable terms. This separation provides time for the switch-over from DL communication (e.g., reception operation by the subordinate entity (e.g., UE)) to UL communication (e.g., transmission by the subordinate entity (e.g., UE)). The foregoing is merely one example of a DL-centric wireless communication structure, and alternative structures having similar features may exist without necessarily deviating from the aspects described herein.

As indicated above,FIG. 5is provided merely as an example. Other examples may differ from what is described with regard toFIG. 5.

FIG. 6is a diagram600showing an example of an UL-centric slot or wireless communication structure. The UL-centric slot may include a control portion602. The control portion602may exist in the initial or beginning portion of the UL-centric slot. The control portion602inFIG. 6may be similar to the control portion502described above with reference toFIG. 5. The UL-centric slot may also include an UL long burst portion604. The UL long burst portion604may sometimes be referred to as the payload of the UL-centric slot. The UL portion may refer to the communication resources utilized to communicate UL data from the subordinate entity (e.g., UE) to the scheduling entity (e.g., UE or BS). In some configurations, the control portion602may be a physical DL control channel (PDCCH).

As illustrated inFIG. 6, the end of the control portion602may be separated in time from the beginning of the UL long burst portion604. This time separation may sometimes be referred to as a gap, guard period, guard interval, and/or various other suitable terms. This separation provides time for the switch-over from DL communication (e.g., reception operation by the scheduling entity) to UL communication (e.g., transmission by the scheduling entity).

The UL-centric slot may also include an UL short burst portion606. The UL short burst portion606inFIG. 6may be similar to the UL short burst portion506described above with reference toFIG. 5, and may include any of the information described above in connection withFIG. 5. The foregoing is merely one example of an UL-centric wireless communication structure, and alternative structures having similar features may exist without necessarily deviating from the aspects described herein.

In one example, a wireless communication structure, such as a frame, may include both UL-centric slots and DL-centric slots. In this example, the ratio of UL-centric slots to DL-centric slots in a frame may be dynamically adjusted based at least in part on the amount of UL data and the amount of DL data that are transmitted. For example, if there is more UL data, then the ratio of UL-centric slots to DL-centric slots may be increased. Conversely, if there is more DL data, then the ratio of UL-centric slots to DL-centric slots may be decreased.

As indicated above,FIG. 6is provided merely as an example. Other examples may differ from what is described with regard toFIG. 6.

NR supports beam indication for uplink transmissions (e.g., PUSCH transmissions, PUCCH transmissions, SRSs, and/or the like) via a spatial relationship with a downlink reference signal (e.g., a signal synchronization block (SSB), a CSI-RS, and/or the like) or an uplink SRS. In some cases, a downlink transmit beam for a downlink non-zero power CSI-RS (NZP-CSI-RS) is indicated by a transmission configuration indication (TCI) state. When an uplink transmission is associated with the NZP-CSI-RS, a UE can determine an uplink transmit beam for an uplink transmission based at least in part on a downlink receive beam that corresponds to the downlink transmit beam that was used to transmit the NZP-CSI-RS to the UE (e.g., using a spatial relationship between the uplink transmission and the downlink reference signal).

Several issues can occur based on the configuration of the downlink reference signal. For example, if the downlink reference signal is configured to be aperiodic (e.g., an A-CSI-RS, an aperiodic NZP-CSI-RS, and/or the like), the downlink transmit beam used to transmit the downlink reference signal may be different in each transmission occasion (e.g., based on different TCI states indicated in the triggering DCI). In this example, if the UE receives multiple transmissions of an aperiodic downlink reference signal within a time period, the UE may not be configured to determine a particular transmit occasion of the downlink reference signal to use for determining an uplink transmit beam for an uplink transmission associated with the downlink reference signal. This can result in delay in transmitting the uplink transmission, improper selection of an uplink transmit beam, and/or the like.

Additionally, or alternatively, and as another example, if a set of resources (e.g., a set of CSI-RS resources, a set of NZP-CSI-RS resources, and/or the like) is configured with repetition, then multiple downlink receive beams may be used in association with receiving the set of resources. Accordingly, the UE may need to change the uplink transmit beam in accordance with changes to the downlink receive beam. However, the UE may not have sufficient time to change the uplink transmit beam between receipt of the last resource included in the set of resources and the uplink transmission associated with the set of resources. This can result in improper selection of an uplink transmit beam, dropped communications, a failed selection of an uplink transmit beam, and/or the like.

Some techniques and apparatuses described herein determine timelines related to a CSI-RS to facilitate beam determination in situations where a UE receives multiple transmissions of an aperiodic CSI-RS within a time period, where the UE receives a set of CSI-RS resources that is configured with repetition, and/or the like. For example, some techniques and apparatuses described herein provide a UE that is capable of determining an uplink transmit beam for a scheduled uplink transmission based at least in part on a configured spatial relationship between the scheduled uplink transmission and a transmission of a CSI-RS. Additionally, or alternatively, and as another example, some techniques and apparatuses described herein provide a UE that is capable of determining a symbol in which an uplink transmission is to be scheduled based at least in part on a CSI-RS resource, of a set of CSI-RS resources (e.g., that includes repetition), received from a BS. Continuing with the previous example, the uplink transmission may be scheduled in a symbol that provides the UE with a sufficient amount of time for uplink transmit beam determination. Some techniques and apparatuses described herein provide for signaling of such a capability.

Thus, some techniques and apparatuses described herein may improve uplink beam determination by a UE, such as in situations where a UE receives multiple transmissions of an aperiodic CSI-RS within a time period. In addition, some techniques and apparatuses described herein may improve uplink beam determination by a UE in other ways, such as by providing the UE with a sufficient amount of time for uplink beam selection in situations where the UE receives a set of CSI-RS resources that is configured with repetition. This improves uplink transmissions from the UE via improved uplink beam selection. In addition, this conserves processing resources that would otherwise be consumed due to improper selection of an uplink transmit beam. Further, this improves uplink communications from the UE via improved uplink transmit beam selection.

FIG. 7is a diagram illustrating an example700of determining uplink transmission timelines related to an A-CSI-RS, in accordance with various aspects of the present disclosure. As shown inFIG. 7, example700includes a BS and a UE.

As shown by reference number710, the BS may transmit, and the UE may receive, a transmission of an A-CSI-RS. For example, the UE may receive the transmission of the A-CSI-RS in association with a PDCCH transmission from the BS (e.g., a transmission of the A-CSI-RS may be triggered by the PDCCH) prior to transmitting a scheduled uplink transmission associated with the A-CSI-RS. In some aspects, a scheduled uplink transmission may include a PUSCH transmission, a PUCCH transmission, an SRS, and/or the like.

In some aspects, a scheduled uplink transmission may be associated with the transmission of the A-CSI-RS. For example, the scheduled uplink transmission and the transmission of the A-CSI-RS may be spatially related. Specifically, an A-CSI-RS resource set may be configured for a UE. Between the configured A-CSI-RS resource set and an uplink transmission, there may be a spatial relationship. The A-CSI-RS resource set may be triggered to be transmitted multiple times in different time occasions. Because the spatial relationship may be defined for the overall A-CSI-RS resource set, not for each triggered instance of the A-CSI-RS resource set, a temporal relationship based on the closest proximity to the uplink transmission may be defined.

In some aspects, the UE may receive downlink control information (DCI) that includes a value in a channel state information (CSI) request field of the DCI in association with receiving the A-CSI-RS transmission (e.g., the transmission of the A-CSI-RS). For example, the UE may receive the DCI in association with the PDCCH transmission from the BS. In some aspects, the value in the CSI request field may indicate a triggering state of the A-CSI-RS transmission. For example, the value may indicate a transmission configuration indication (TCI) state for measuring A-CSI-RSs and/or for reporting those measurements as CSI to the BS.

In some aspects, the A-CSI-RS transmission may have a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the same A-CSI-RS. For example, the UE may receive the A-CSI-RS transmission in a symbol closer in time prior to a symbol for a scheduled uplink transmission relative to other transmissions of the A-CSI-RS that the UE received prior to the symbol in which the scheduled uplink transmission is scheduled. In some aspects, the UE may receive the A-CSI-RS transmission in a same slot as a scheduled uplink transmission. In some aspects, the UE may receive the A-CSI-RS transmission in a different slot than a scheduled uplink transmission.

As shown by reference number720, the UE may determine an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the A-CSI-RS (e.g., in a case where an uplink transmission and a downlink transmission are configured to be spatially related via the higher-layer parameter “spatialRelationInfo”). For example, the UE may determine the uplink transmit beam after receiving the A-CSI-RS transmission from the BS. In some aspects, the UE may determine the uplink transmit beam for the scheduled uplink transmission based at least in part on the value in the CSI request field (e.g., included in the DCI), based at least in part on the TCI state indicated by the value, and/or the like.

In some aspects, the UE may determine the uplink transmit beam during a same slot in which the A-CSI-RS transmission was received. For example, if the UE receives the A-CSI-RS transmission in the same slot as when the uplink transmission is scheduled, then the UE may determine the uplink transmit beam during the same slot in which the A-CSI-RS transmission was received. In some aspects, when the UE receives the A-CSI-RS transmission during a slot that is different than the slot in which the scheduled uplink transmission is scheduled, then the UE may determine the uplink transmit beam during the slot in which the UE received the A-CSI-RS transmission, or during the slot in which the scheduled uplink transmission is scheduled to be transmitted to the BS.

In some aspects, the UE may determine the uplink transmit beam based at least in part on a downlink receive beam via which the UE received the A-CSI-RS transmission. For example, the UE may receive the A-CSI-RS transmission via a particular downlink receive beam and may determine to use a corresponding uplink transmit beam as the uplink transmit beam for the scheduled uplink transmission.

In some aspects, prior to determining the uplink transmit beam in the manner described herein, the UE may determine whether the A-CSI-RS transmission and one or more other transmissions of the same A-CSI-RS were received within a time period. For example, the UE may determine whether the A-CSI-RS transmission and the one or more other transmissions of the A-CSI-RS were received within the same slot, within a particular amount of time of each other, and/or the like. In some aspects, if the UE determines that the A-CSI-RS transmission and the one or more other transmissions of the A-CSI-RS were received during the time period, and the UE determines that the A-CSI-RS transmission and the one or more other transmissions of A-CSI-RS are associated with different TCI states, then the UE may determine the uplink transmit beam in the manner described herein. Conversely, in some aspects, the UE may determine the uplink transmit beam in another manner (e.g., without determining whether the A-CSI-RS transmission has a closest temporal proximity prior to a scheduled uplink transmission relative to one or more other transmissions of the A-CSI-RS), such as when the A-CSI-RS transmission and the one or more other transmissions of the A-CSI-RS were not received within a time period, when the A-CSI-RS transmission and the one or more other transmissions of the A-CSI-RS are not associated with different TCI states, and/or the like. This conserves processing resources of the UE by selectively controlling when the UE determines the uplink transmit beam in the manner described herein.

As shown by reference number730, the BS may determine an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the A-CSI-RS. For example, the BS may determine the uplink receive beam for the scheduled uplink transmission after transmitting the transmission of the A-CSI-RS to the UE. In some aspects, the BS may determine the uplink receive beam in a manner similar to that described with respect to the UE. For example, the BS may determine the uplink receive beam after transmitting the DCI to the UE (e.g., based at least in part on the value in the CSI request field in the DCI, the TCI state, and/or the like). Additionally, or alternatively, and as another example, the BS may determine the uplink receive beam in a same slot in which the uplink transmission is scheduled or in a different slot than in which the uplink transmission is scheduled. Additionally, or alternatively, and as another example, the BS may determine the uplink receive beam based at least in part on a downlink transmit beam used to transmit the transmission of the A-CSI-RS to the UE, after determining that the A-CSI-RS transmission and one or more other transmissions of the A-CSI-RS were transmitted within a time period, and/or the like.

In some aspects, after the UE has determined the uplink transmit beam and the BS has determined the uplink receive beam, the UE may transmit the scheduled uplink transmission to the BS and the BS may receive the scheduled uplink transmission from the UE. For example, the UE may transmit the scheduled uplink transmission using the uplink transmit beam and the BS may receive the scheduled uplink transmission using the uplink receive beam.

As indicated above,FIG. 7is provided as an example. Other examples may differ from what is described with respect toFIG. 7.

FIG. 8is a diagram800illustrating an example of determining uplink transmission timelines related to an A-CSI-RS transmission, in accordance with various aspects of the present disclosure.

As shown in inFIG. 8, and by reference number802, a UE may receive a PDCCH transmission in a first slot (e.g., slot P). In some aspects, the PDCCH transmission may be similar to other PDCCH transmissions described elsewhere herein. As shown by reference number804, the PDCCH transmission may be associated with information that identifies a TCI state. In some aspects, the TCI state and/or the PDCCH may trigger transmission of an A-CSI-RS by a BS.

As shown by reference number806, the UE may receive the A-CSI-RS transmission in a second slot (e.g., slot P+1), in a manner similar to that described elsewhere herein. In some aspects, the UE may receive the A-CSI-RS transmission using a downlink receive beam. As shown by reference number808, the A-CSI-RS transmission may have a closest temporal proximity prior to a scheduled uplink transmission. For example, the A-CSI-RS transmission may be received in a same slot in which the scheduled uplink transmission is scheduled for transmission by the UE (e.g., slot P+1). In other examples, the UE may receive the A-CSI-RS transmission in a different slot than the slot in which the scheduled uplink transmission is scheduled for transmission (e.g., in slot P). In some aspects, the UE may determine an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the A-CSI-RS transmission from the BS, in a manner similar to that described elsewhere herein.

As shown by reference number810, the PDCCH may be associated with PUSCH scheduling. For example, the PDCCH may cause a CSI report, related to the A-CSI-RS transmission, to be scheduled. In some aspects, the CSI report may be scheduled for a time period after receipt of the A-CSI-RS transmission, for a time period after transmission of the scheduled uplink transmission, and/or the like. For example, and as shown inFIG. 8, the CSI report may be scheduled for transmission in a third slot (e.g., slot P+2).

As indicated above,FIG. 8is provided as an example. Other examples may differ from what is described with respect toFIG. 8.

FIG. 9is a diagram900illustrating an example of determining uplink transmission timelines related to a set of CSI-RS resources that includes repetition, in accordance with various aspects of the present disclosure. As shown inFIG. 9, example900includes a BS and a UE.

As shown by reference number910, the BS may transmit, and the UE may receive, a set of CSI-RS resources. For example, the UE may receive the set of CSI-RS resources in association with a PDCCH transmission from the BS (e.g., the set of CSI-RS resources may be triggered by the PDCCH from the BS). In some aspects, the set of CSI-RS resources may be configured with repetition (e.g., multiple CSI-RS resources of a same transmit beam may be included in the set of CSI-RS resources). In some aspects, the set of CSI-RS resources may be a set of aperiodic CSI-RS (A-CSI-RS) resources. In some aspects, the set of CSI-RS resources may be a set of semi-persistent CSI-RS (SP-CSI-RS) resources. In some aspects, the set of CSI-RS resources may be a set of periodic CSI-RS (P-CSI-RS) resources.

As shown by reference number920, the UE may determine that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was received. For example, the UE may determine that the uplink transmission is to be scheduled at least the quantity of symbols after receiving the set of CSI-RS resources. In some aspects, an uplink transmission may be associated with the transmission of the set of CSI-RS resources. For example, the uplink transmission and the transmission of the set of CSI-RS resources may be spatially related.

In some aspects, the quantity of symbols may be based at least in part on a capability of the UE, may be based at least in part on a configuration by the UE, and/or the like. For example, the quantity of symbols may be based on a processing capability of the UE. As a specific example, in a situation where a first UE has more processing capability than a second UE, a first quantity of symbols for the first UE may include fewer symbols relative to a second quantity of symbols for the second UE, as the first UE may not need as much time to determine an uplink transmit beam as the second UE due to the higher processing capability of the first UE.

In some aspects, the BS may transmit information to the UE that indicates the quantity of symbols as a configuration. For example, during attachment and/or connection of the UE, the BS may identify the capability of the UE, and may send information to the UE that indicates the quantity of symbols. Additionally, or alternatively, during attachment and/or connection, the BS may transmit a schedule of quantities of symbols to the UE that the UE is to use to configure the quantity of symbols based on the capability of the UE. In this way, the quantity of symbols may be dynamic. In addition, in this way, the UE may determine that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol based at least in part on receiving the configuration, based at least in part on the capability of the UE, and/or the like.

In some aspects, the quantity of symbols may be predetermined. For example, the quantity of symbols may be constant regardless of a capability of the UE, regardless of a configuration received from the BS, and/or the like. In some aspects, the UE may determine that the uplink transmission is to be scheduled a predetermined quantity of symbols after the symbol. This reduces or eliminates a need for the BS to transmit information identifying the quantity of symbols multiple times (e.g., for multiple uplink transmissions), thereby conserving processing resources of the UE and the BS, conserving network resources (e.g., bandwidth) between the UE and the BS, and/or the like.

In some implementations, the UE may determine a CSI-RS resource, of the set of CSI-RS resources, that is a most recently received CSI-RS resource relative to one or more other CSI-RS resources of the set of CSI-RS resources. For example, the UE may determine a CSI-RS resource that has a closest temporal proximity to an uplink transmission. In some aspects, the UE may determine that the uplink transmission is to be scheduled the predetermined quantity of symbols after the symbol in which the CSI-RS resource was received based at least in part on determining that the CSI-RS resource is the most recently received CSI-RS resource.

In some aspects, the UE may determine an uplink transmit beam for the uplink transmission. For example, the UE may determine an uplink transmit beam for the uplink transmission based at least in part on determining a downlink receive beam during a time period corresponding to the quantity of symbols after the symbol. As a specific example, the UE may have determined a downlink receive beam during the time period and may determine a corresponding uplink transmit beam as the uplink transmit beam for the uplink transmission.

In some aspects, if an uplink transmission is scheduled for transmission fewer than the quantity of symbols after the symbol in which the CSI-RS resource was received, the UE may determine an uplink transmit beam based on another transmission of the set of CSI-RS resources (e.g., a previous transmission of the set of CSI-RS resources). For example, the UE may determine an uplink transmit beam for the uplink transmission based at least in part on the second most recent transmission of the set of CSI-RS resources, the third most recent transmission of the set of CSI-RS resources, and/or the like rather than based at least in part on the most recent transmission of the set of CSI-RS resources (e.g., such that the uplink transmission is transmitted the quantity of symbols after receipt of the set of CSI-RS resources that was used to determine the uplink transmit beam). Additionally, or alternatively, the UE may use the most recently used uplink transmit beam for the transmission. This reduces or eliminates a need for the UE to delay transmission of an uplink transmission.

In some aspects, the UE may determine whether the set of CSI-RS resources is configured with the repetition prior to determining that the uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which the CSI-RS was received. In some aspects, the UE may operate normally if the UE fails to determine that the set of CSI-RS resources is configured with the repetition. For example, the UE may not determine that the uplink transmission is to be scheduled for at least the quantity of symbols after the symbol in which the CSI-RS was received. Conversely, in some aspects, if the UE determines that the set of CSI-RS resources is configured with the repetition, then the UE may determine that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol in which the CSI-RS resource was received.

As shown by reference number930, the BS may determine that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol in which the CSI-RS resource was transmitted based at least in part on transmitting the set of CSI-RS resources. For example, the BS may determine that an uplink transmission is to be scheduled at least the quantity of symbols after the symbol in which the CSI-RS resource was transmitted after transmitting the set of CSI-RS resources.

In some aspects, the BS may determine that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol in a manner similar to that described with regard to the UE. For example, the BS may determine that the uplink transmission is to be scheduled at least the quantity of symbols after determining that the set of CSI-RS resources is configured with the repetition, based at least in part on determining that the set of CSI-RS resources was the most recently transmitted set of CSI-RS resources, and/or the like. In some aspects, the BS may determine an uplink receive beam for the uplink transmission based at least in part on determining a downlink transmit beam during a time period corresponding to the quantity of symbols after the symbol. For example, the BS may determine an uplink receive beam that corresponds to the downlink transmit beam.

In some aspects, the UE may transmit, and the BS may receive, the uplink transmission at least the quantity of symbols after the symbol. For example, the UE may transmit the uplink transmission via an uplink transmit beam that the UE determined and the BS may receive the uplink transmission via an uplink receive beam that the BS determined.

As indicated above,FIG. 9is provided as an example. Other examples may differ from what is described with respect toFIG. 9.

FIG. 10is a diagram1000illustrating an example of determining uplink transmission timelines related to a set of CSI-RS resources that includes repetition, in accordance with various aspects of the present disclosure.

As shown in inFIG. 10, and by reference number1002, a UE may receive a PDCCH transmission in a first slot (e.g., slot Q). In some aspects, the PDCCH transmission may be similar to other PDCCH transmissions described elsewhere herein. As shown by reference number1004, the PDCCH transmission may be associated with information that identifies a TCI state. In some aspects, the TCI state and/or the PDCCH may trigger transmission of a set of CSI-RS resources by a BS.

As shown by reference number1006, the UE may receive the set of CSI-RS resources in a second slot (e.g., slot Q+1) (e.g., a set of CSI-RS resources that has multiple temporal repetition of the CSI-RS resources of the set of CSI-RS resources with the same TCI state), in a manner similar to that described elsewhere herein. In some aspects, the UE may receive the set of CSI-RS resources using a downlink receive beam. In some aspects, the UE may determine that the uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was received, in a manner similar to that described elsewhere herein. As shown by reference number1008, the UE may determine that the uplink transmission is to be scheduled such that the CSI-RS resource has a closest temporal proximity prior to the uplink transmission, but that the uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which the CSI-RS resource was received.

As shown by reference number1010, the UE may determine that the quantity of symbols is to cause the uplink transmission to be scheduled in a different slot than the slot in which the CSI-RS resource was received. In other examples, the UE may determine that the quantity of symbols is to cause the uplink transmission to be scheduled in the same slot in which the CSI-RS resource was received.

As indicated above,FIG. 10is provided as an example. Other examples may differ from what is described with respect toFIG. 10.

FIG. 11is a diagram illustrating an example process1100performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process1100is an example where a UE (e.g., UE120) performs a determination of uplink transmission timelines related to an A-CSI-RS.

As shown inFIG. 11, in some aspects, process1100may include receiving, from a base station (BS), a transmission of an aperiodic channel state information reference signal (A-CSI-RS), wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS (block1110). For example, the UE (e.g., using antenna252, controller/processor280, memory282, and/or the like) may receive, from a BS, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS, as described above.

As further shown inFIG. 11, in some aspects, process1100may include determining an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the A-CSI-RS (block1120). For example, the UE (e.g., using controller/processor280) may determine an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the A-CSI-RS, as described above.

In a first aspect, the UE may receive downlink control information (DCI) that includes a value in a channel state information (CSI) request field of the DCI, wherein the value in the CSI request field indicates a transmission configuration indication (TCI) state of the transmission of the A-CSI-RS, and may determining the uplink transmit beam based at least in part on: the value in the CSI request field, or the TCI state. In a second aspect, alone or in combination with the first aspect, the UE may receive the transmission of the A-CSI-RS in a same slot in which the scheduled uplink transmission is scheduled. In a third aspect, in combination with the second aspect, the UE may determine the uplink transmit beam during the same slot in which the transmission of the A-CSI-RS was received.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the UE may receive the transmission of the A-CSI-RS in a slot prior to another slot in which the scheduled uplink transmission is scheduled. In a fifth aspect, in combination with the fourth aspect, the UE may determine the uplink transmit beam during the slot, or may determine the uplink transmit beam during the other slot. In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the UE may determine the uplink transmit beam based at least in part on a downlink receive beam via which the UE received the transmission of the A-CSI-RS. In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the UE may transmit the scheduled uplink transmission via the uplink transmit beam based at least in part on determining the uplink transmit beam for the scheduled uplink transmission.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the UE may determine that the transmission of the A-CSI-RS and the one or more other transmissions of the A-CSI-RS were received within a time period based at least in part on receiving the transmission of the A-CSI-RS, wherein the transmission of the A-CSI-RS and the one or more other transmissions of the A-CSI-RS are associated with different transmission configuration indication (TCI) states, and may determine the uplink transmit beam based at least in part on determining that the transmission of the A-CSI-RS and the one or more other transmissions of the A-CSI-RS were received within the time period. In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the scheduled uplink transmission includes a physical uplink shared channel (PUSCH) transmission, a physical uplink control channel (PUCCH) transmission, or a sounding reference signal (SRS).

AlthoughFIG. 11shows example blocks of process1100, in some aspects, process1100may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted inFIG. 11. Additionally, or alternatively, two or more of the blocks of process1100may be performed in parallel.

FIG. 12is a diagram illustrating an example process1200performed, for example, by a BS, in accordance with various aspects of the present disclosure. Example process1200is an example where a BS (e.g., BS110) performs a determination of uplink transmission timelines related to an A-CSI-RS.

As shown inFIG. 12, in some aspects, process1200may include transmitting, to a UE, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS (block1210). For example, the BS (e.g., using antenna234, controller/processor240, and/or the like) may transmit, to a UE, a transmission of an A-CSI-RS, wherein the transmission of the A-CSI-RS has a closest temporal proximity prior to a scheduled uplink transmission from the UE and relative to one or more other transmissions of the A-CSI-RS, as described above.

As further shown inFIG. 12, in some aspects, process1200may include determining an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the A-CSI-RS (block1220). For example, the BS (e.g., using controller/processor240) may determine an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the A-CSI-RS, as described above.

In a first aspect, the BS may transmit downlink control information (DCI) that includes a value in a channel state information (CSI) request field of the DCI in association with the transmission of the A-CSI-RS, wherein the value in the CSI request field indicates a transmission configuration indication (TCI) state of the transmission of the A-CSI-RS, and may determine the uplink receive beam based at least in part on the value in the CSI request field, or the TCI state. In a second aspect, alone or in combination with the first aspect, the BS may transmit the transmission of the A-CSI-RS in a same slot in which the scheduled uplink transmission is scheduled. In a third aspect, in combination with the second aspect, the BS may determine the uplink receive beam during the same slot in which the scheduled uplink transmission is scheduled.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, the BS may transmit the transmission of the A-CSI-RS in a slot prior to another slot in which the scheduled uplink transmission is scheduled. In a fifth aspect, in combination with the fourth aspect, the BS may determine the uplink receive beam during the slot, or may determine the uplink receive beam during the other slot. In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the BS may determine the uplink receive beam based at least in part on a downlink transmit beam via which the BS transmitted the transmission of the A-CSI-RS. In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the BS may receive the scheduled uplink transmission via the uplink receive beam based at least in part on determining the uplink receive beam for the scheduled uplink transmission.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the BS may determine that the transmission of the A-CSI-RS and the one or more other transmissions of the A-CSI-RS were transmitted within a time period based at least in part on transmitting the transmission of the A-CSI-RS, wherein the transmission of the A-CSI-RS and the one or more other transmissions of the A-CSI-RS are associated with different TCI states, and may determine the uplink receive beam based at least in part on determining that the transmission of the A-CSI-RS and the one or more other transmissions of the A-CSI-RS were transmitted within the time period. In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the scheduled uplink transmission includes a physical uplink shared channel (PUSCH) transmission, a physical uplink control channel (PUCCH) transmission, or a sounding reference signal (SRS).

AlthoughFIG. 1200shows example blocks of process1200, in some aspects, process1200may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted inFIG. 12. Additionally, or alternatively, two or more of the blocks of process1200may be performed in parallel.

FIG. 13is a diagram illustrating an example process1300performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process1300is an example where a UE (e.g., UE120) performs a determination of uplink transmission timelines related to a set of CSI-RS resources that includes repetition.

As shown inFIG. 13, in some aspects, process1300may include receiving, from a BS, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition (block1310). For example, the UE (e.g., using antenna252, controller/processor280, memory282, and/or the like) may receive, from a BS, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition, as described above.

As further shown inFIG. 13, in some aspects, process1300may include determining that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was received (block1320). For example, the UE (e.g., using controller/processor280) may determine that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was received, as described above.

In a first aspect, the set of CSI-RS resources is a set of aperiodic CSI-RS (A-CSI-RS) resources. In a second aspect, alone or in combination with the first aspect, the set of CSI-RS resources is a set of semi-persistent CSI-RS (SP-CSI-RS) resources. In a third aspect, alone or in combination with one or more of the first and second aspects, the set of CSI-RS resources is a set of periodic CSI-RS (P-CSI-RS) resources. In a fourth aspect, alone or in combination with one or more of the first through third aspects, the quantity of symbols is based at least in part on a capability of the UE. In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the quantity of symbols is based at least in part on a configuration from the BS. In a sixth aspect, in combination with the fifth aspect, the UE may receive the configuration from the BS based at least in part on receiving the set of CSI-RS resources, and may determine that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol based at least in part on receiving the configuration.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the quantity of symbols is a predetermined quantity of symbols. In an eighth aspect, in combination with the seventh aspect, the UE may determine that the uplink transmission is to be scheduled the predetermined quantity of symbols after the symbol. In a ninth aspect, in combination with the eighth aspect, the UE may determine that the uplink transmission is to be scheduled the predetermined quantity of symbols after the symbol in which the CSI-RS resource was received, wherein the CSI-RS resource is a most recently received CSI-RS resource relative to one or more other CSI-RS resources of the set of CSI-RS resources.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the UE may determine an uplink transmit beam for the uplink transmission based at least in part on determining a downlink receive beam during a time period corresponding to the quantity of symbols after the symbol. In an eleventh aspect, in combination with the tenth aspect, the UE may determine that another uplink transmission is not scheduled for at least the quantity of symbols after the symbol, wherein the uplink transmission and the other uplink transmission are different, and may determine another uplink transmit beam for the other uplink transmission based at least in part on determining that the other uplink transmission is not scheduled for at least the quantity of symbols after the symbol, wherein the uplink transmit beam and the other uplink transmit beam are different, wherein the other uplink transmit beam is determined based at least in part on a previous transmission of the set of CSI-RS resources, or a most recently used uplink transmit beam relative to other uplink transmit beams.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the UE may determine that the set of CSI-RS resources is configured with the repetition, and may determine that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol based at least in part on determining that the set of CSI-RS resources is configured with the repetition. In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the UE may transmit the uplink transmission to the BS at least the quantity of symbols after the symbol based at least in part on determining that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol.

FIG. 14is a diagram illustrating an example process1400performed, for example, by a BS, in accordance with various aspects of the present disclosure. Example process1400is an example where a BS (e.g., BS110) performs a determination of uplink transmission timelines related to a set of CSI-RS resources that includes repetition.

As shown inFIG. 14, in some aspects, process1400may include transmitting, to a UE, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition (block1410). For example, the BS (e.g., using antenna234, controller/processor240, and/or the like) may transmit, to a UE, a set of CSI-RS resources, wherein the set of CSI-RS resources is configured with repetition, as described above.

As further shown inFIG. 14, in some aspects, process1400may include determining that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was transmitted based at least in part on transmitting the set of CSI-RS resources (block1420). For example, the BS (e.g., using controller/processor240, and/or the like) may determine that an uplink transmission is to be scheduled at least a quantity of symbols after a symbol in which a CSI-RS resource, of the set of CSI-RS resources, was transmitted based at least in part on transmitting the set of CSI-RS resources, as described above.

In a first aspect, the set of CSI-RS resources is a set of aperiodic CSI-RS (A-CSI-RS) resources. In a second aspect, alone or in combination with the first aspect, the set of CSI-RS resources is a set of semi-persistent CSI-RS (SP-CSI-RS) resources. In a third aspect, alone or in combination with one or more of the first and second aspects, the set of CSI-RS resources is a set of periodic CSI-RS (P-CSI-RS) resources. In fourth aspect, alone or in combination with one or more of the first through third aspects, the quantity of symbols is based at least in part on a capability of the UE. In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the quantity of symbols is based at least in part on a configuration from the BS.

In a sixth aspect, in combination with the fifth aspect, the BS may transmit the configuration to the UE based at least in part on transmitting the set of CSI-RS resources, and may determine that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol based at least in part on transmitting the configuration. In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the quantity of symbols is a predetermined quantity of symbols. In an eighth aspect, in combination with the seventh aspect, the BS may determine that the uplink transmission is to be scheduled the predetermined quantity of symbols after the symbol.

In a ninth aspect, in combination with the eighth aspect, the BS may determine that the uplink transmission is to be scheduled the predetermined quantity of symbols after the symbol in which the CSI-RS resource was transmitted, wherein the CSI-RS resource is a most recently transmitted CSI-RS resource relative to one or more other CSI-RS resources of the set of CSI-RS resources. In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the BS may determine an uplink receive beam for the uplink transmission based at least in part on determining a downlink transmit beam during a time period corresponding to the quantity of symbols after the symbol.

In an eleventh aspect, in combination with the tenth aspect, the BS may determine that another uplink transmission is not scheduled for at least the quantity of symbols after the symbol, wherein the uplink transmission and the other uplink transmission are different, and may determine another uplink receive beam for the other uplink transmission based at least in part on determining that the other uplink transmission is not scheduled for at least the quantity of symbols after the symbol, wherein the uplink receive beam and the other uplink receive beam are different, wherein the other uplink receive beam is determined based at least in part on a previous transmission of the set of CSI-RS resources, or a most recently used uplink receive beam relative to other uplink receive beams. In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the BS may determine that the set of CSI-RS resources is configured with the repetition, and may determine that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol based at least in part on determining that the set of CSI-RS resources is configured with the repetition. In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the BS may receive the uplink transmission at least the quantity of symbols after the symbol based at least in part on determining that the uplink transmission is to be scheduled at least the quantity of symbols after the symbol.

AlthoughFIG. 14shows example blocks of process1400, in some aspects, process1400may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted inFIG. 14. Additionally, or alternatively, two or more of the blocks of process1400may be performed in parallel.

FIG. 15is a diagram illustrating an example process1500performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process1500is an example where a UE (e.g., UE120and/or the like) performs operations associated with techniques and apparatuses for determining uplink transmission timelines related to a CSI-RS.

As shown inFIG. 15, in some aspects, process1500may include receiving, from a BS, a transmission of a CSI-RS, wherein the transmission of the CSI-RS is received at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE (block1510). For example, the UE (e.g., using antenna252, DEMOD254, MIMO detector256, receive processor258, controller/processor280, and/or the like) may receive, from a BS, a transmission of a CSI-RS, as described above. In some aspects, the transmission of the CSI-RS is received at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE.

As further shown inFIG. 15, in some aspects, process1500may include determining an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the CSI-RS (block1520). For example, the UE (e.g., using controller/processor280, and/or the like) may determine an uplink transmit beam for the scheduled uplink transmission based at least in part on receiving the transmission of the CSI-RS, as described above.

In a first aspect, the CSI-RS is one of an aperiodic CSI-RS (A-CSI-RS), a semi-persistent CSI-RS (SP-CSI-RS), or a periodic CSI-RS (P-CSI-RS). In a second aspect, alone or in combination with the first aspect, the UE may receive downlink control information (DCI) that includes a value in a channel state information (CSI) request field of the DCI, wherein the value in the CSI request field indicates a transmission configuration indication (TCI) state of the transmission of the CSI-RS, and may determine the uplink transmit beam based at least in part on: the value in the CSI request field, or the TCI state.

In a third aspect, alone or in combination with one or more of the first and second aspects, the UE may receive the transmission of the CSI-RS in a same slot in which the scheduled uplink transmission is scheduled. In a fourth aspect, in combination with the third aspect, the UE may determine the uplink transmit beam during the same slot in which the transmission of the CSI-RS was received.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the UE may receive the transmission of the CSI-RS in a slot prior to another slot in which the scheduled uplink transmission is scheduled. In a sixth aspect, in combination with the fifth aspect, the UE may determine the uplink transmit beam during the slot in which the transmission of the CSI-RS is received, or may determine the uplink transmit beam during the other slot in which the scheduled uplink transmission is scheduled. In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the UE may determine the uplink transmit beam based at least in part on a downlink receive beam via which the UE received the transmission of the CSI-RS.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the UE may transmit the scheduled uplink transmission via the determined uplink transmit beam. In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the UE may determine that the transmission of the CSI-RS and one or more other transmissions of the CSI-RS were received within a time period based at least in part on receiving the transmission of the CSI-RS, wherein the transmission of the CSI-RS and the one or more other transmissions of the CSI-RS are associated with different TCI states, and may determine the uplink transmit beam based at least in part on determining that the transmission of the CSI-RS and the one or more other transmissions of the CSI-RS were received within the time period.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the scheduled uplink transmission includes a physical uplink shared channel (PUSCH) transmission, a physical uplink control channel (PUCCH) transmission, or a sounding reference signal (SRS). In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the CSI-RS is configured with repetition.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the quantity of symbols is based at least in part on at least one of a capability of the UE, or a configuration from the BS. In a thirteenth aspect, in combination with the twelfth aspect, the UE may receive, in association with receiving the CSI-RS, the configuration from the BS based at least in part on receiving the CSI-RS, and may determine, prior to determining the uplink transmit beam, that an uplink transmission is to be scheduled at least the quantity of symbols after the transmission of the CSI-RS is received based at least in part on receiving the configuration from the BS, wherein scheduling of the uplink transmission forms the scheduled uplink transmission.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the quantity of symbols is a predetermined quantity of symbols. In a fifteenth aspect, in combination with the fourteenth aspect, the UE may determine, prior to determining the uplink transmit beam, that an uplink transmission is to be scheduled the predetermined quantity of symbols after the symbol, wherein scheduling the uplink transmission forms the scheduled uplink transmission.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the UE may determine that another scheduled uplink transmission is not scheduled for at least the quantity of symbols after the symbol, wherein the scheduled uplink transmission and the other scheduled uplink transmission are different, and may determine another uplink transmit beam for the other scheduled uplink transmission based at least in part on determining that the other scheduled uplink transmission is not scheduled for at least the quantity of symbols after the symbol, wherein the uplink transmit beam and the other uplink transmit beam are different, wherein the other uplink transmit beam is determined based at least in part on a previous transmission of the CSI-RS, or a most recently used uplink transmit beam relative to other uplink transmit beams. In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the UE may transmit the scheduled uplink transmission to the BS at least the quantity of symbols after receiving the transmission of the CSI-RS based at least in part on determining that an uplink transmission is to be scheduled, wherein scheduling the uplink transmission forms the scheduled uplink transmission.

AlthoughFIG. 15shows example blocks of process1500, in some aspects, process1500may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted inFIG. 15. Additionally, or alternatively, two or more of the blocks of process1500may be performed in parallel.

FIG. 16is a diagram illustrating an example process1600performed, for example, by a base station (BS), in accordance with various aspects of the present disclosure. Example process1600is an example where a BS (e.g., BS110and/or the like) performs operations associated with techniques and apparatuses for determining uplink transmission timelines related to a CSI-RS.

As shown inFIG. 16, in some aspects, process1600may include transmitting, to a UE, a transmission of a CSI-RS wherein the transmission of the CSI-RS is transmitted at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE (block1610). For example, the BS (e.g., using controller/processor240, transmit processor220, TX MIMO processor230, MOD232, antenna234, and/or the like) may transmit, to a UE, a transmission of a CSI-RS, as described above. In some aspects, the transmission of the CSI-RS is transmitted at least a quantity of symbols prior to a symbol of a scheduled uplink transmission from the UE.

As further shown inFIG. 16, in some aspects, process1600may include determining an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the CSI-RS (block1620). For example, the BS (e.g., using controller/processor240and/or the like) may determine an uplink receive beam for the scheduled uplink transmission based at least in part on transmitting the transmission of the CSI-RS, as described above.

In a first aspect, the CSI-RS is one of an aperiodic CSI-RS (A-CSI-RS), a semi-persistent CSI-RS (SP-CSI-RS), or a periodic CSI-RS (P-CSI-RS). In a second aspect, alone or in combination with the first aspect, the BS may transmit downlink control information (DCI) that includes a value in a channel state information (CSI) request field of the DCI in association with the transmission of the CSI-RS, wherein the value in the CSI request field indicates a transmission configuration indication (TCI) state of the transmission of the CSI-RS, and may determine the uplink receive beam based at least in part on the value in the CSI request field, or the TCI state.

In a third aspect, alone or in combination with one or more of the first and second aspects, the BS may transmit the transmission of the CSI-RS in a same slot in which the scheduled uplink transmission is scheduled. In a fourth aspect, in combination with the third aspect, the BS may determine the uplink receive beam during the same slot in which the scheduled uplink transmission is scheduled.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the BS may transmit the transmission of the CSI-RS in a slot prior to another slot in which the scheduled uplink transmission is scheduled. In a sixth aspect, in combination with the fifth aspect, the BS may determine the uplink receive beam during the slot in which the transmission of the CSI-RS is transmitted, or may determine the uplink receive beam during the other slot in which the scheduled uplink transmission is scheduled.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the BS may determine the uplink receive beam based at least in part on a downlink transmit beam via which the BS transmitted the transmission of the CSI-RS. In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the BS may receive the scheduled uplink transmission via the determined uplink receive beam.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the BS may determine that the transmission of the CSI-RS and one or more other transmissions of the CSI-RS were transmitted within a time period based at least in part on transmitting the transmission of the CSI-RS, wherein the transmission of the CSI-RS and the one or more other transmissions of the CSI-RS are associated with different transmission configuration indication (TCI) states, and may determine the uplink receive beam based at least in part on determining that the transmission of the CSI-RS and the one or more other transmissions of the CSI-RS were transmitted within the time period. In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the scheduled uplink transmission includes a physical uplink shared channel (PUSCH) transmission, a physical uplink control channel (PUCCH) transmission, or a sounding reference signal (SRS).

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the CSI-RS is configured with repetition. In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the quantity of symbols is based at least in part on at least one of: a capability of the UE, or a configuration from the BS. In a thirteenth aspect, in combination with the twelfth aspect, the BS may transmit the configuration to the UE based at least in part on transmitting the CSI-RS, and may determine, prior to determining the uplink receive beam, that an uplink transmission is to be scheduled at least the quantity of symbols after the transmission of the CSI-RS is transmitted based at least in part on transmitting the configuration to the UE, wherein scheduling the uplink transmission forms the scheduled uplink transmission.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the quantity of symbols is a predetermined quantity of symbols. In a fifteenth aspect, in combination with the fourteenth aspect, the BS may determine, prior to determining the uplink transmit beam, that an uplink transmission is to be scheduled the predetermined quantity of symbols after the symbol, wherein scheduling the uplink transmission forms the scheduled uplink transmission.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the BS may determine that another scheduled uplink transmission is not scheduled for at least the quantity of symbols after the symbol, wherein the scheduled uplink transmission and the other scheduled uplink transmission are different, and may determine another uplink receive beam for the other scheduled uplink transmission based at least in part on determining that the other scheduled uplink transmission is not scheduled for at least the quantity of symbols after the symbol, wherein the uplink receive beam and the other uplink receive beam are different, wherein the other uplink receive beam is determined based at least in part on a previous transmission of the CSI-RS, or a most recently used uplink receive beam relative to other uplink receive beams. In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the BS may receive the scheduled uplink transmission at least the quantity of symbols after receiving the transmission of the CSI-RS based at least in part on determining that an uplink transmission is to be scheduled, wherein scheduling the uplink transmission forms the scheduled uplink transmission.

AlthoughFIG. 16shows example blocks of process1600, in some aspects, process1600may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted inFIG. 16. Additionally, or alternatively, two or more of the blocks of process1600may be performed in parallel.

As used herein, the term “component” is intended to be broadly construed as hardware, firmware, or a combination of hardware and software. As used herein, a “processor” is implemented in hardware, firmware, or a combination of hardware and software.