Patent Description:
Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for reference signal (RS) grouping for a full-duplex operation.

<CIT> discloses a reporting framework, in which configuration data-serving cells/TxPs may be carried out based on CSI-RS. In some aspects, a set of CSI-RS ports that a UE considers as one group for precoding matrix indicator (PMI)/channel quality indicator (CQI)/rank indicator (RI) reporting, may be defined.

<NPL> discloses a study in-band full-duplex (IBFD) communication as an enabler for channel state information at transmitter (CSIT) by applying reciprocity principle, as well as a study of hybrid beamforming, semi-open loop schemes for high Doppler UE and scheduled CSI-RS.

The scope of the present invention is defined by the scope of the appended claims.

While aspects are described in the present disclosure by illustration to some examples, those skilled in the art will understand that such aspects may be implemented in many different arrangements and scenarios. Techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and/or packaging arrangements. For example, some aspects may be implemented via integrated chip embodiments or other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, or artificial intelligence-enabled devices). Aspects may be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, or system-level components. Devices incorporating described aspects and features may include additional components and features for implementation and practice of claimed and described aspects. For example, transmission and reception of wireless signals may include a number of components for analog and digital purposes (e.g., hardware components including antennas, radio frequency chains, power amplifiers, modulators, buffers, processor(s), interleavers, adders, or summers). It is intended that aspects described herein may be practiced in a wide variety of devices, components, systems, distributed arrangements, or end-user devices of varying size, shape, and constitution.

Controller/processor <NUM> of base station <NUM>, controller/processor <NUM> of UE <NUM>, and/or any other component(s) of <FIG> may perform one or more techniques associated with reference signal (RS) grouping for a full-duplex operation, as described in more detail elsewhere herein. For example, controller/processor <NUM> of base station <NUM>, controller/processor <NUM> of UE <NUM>, and/or any other component(s) of <FIG> may perform or direct operations of, for example, process <NUM> of <FIG>, process <NUM> of <FIG>, and/or other processes as described herein. Memories <NUM> and <NUM> may store data and program codes for base station <NUM> and UE <NUM>, respectively. In some aspects, memory <NUM> and/or memory <NUM> may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and/or program code) for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compiling, converting, and/or interpreting) by one or more processors of the base station <NUM> and/or the UE <NUM>, may cause the one or more processors, the UE <NUM>, and/or the base station <NUM> to perform or direct operations of, for example, process <NUM> of <FIG>, process <NUM> of <FIG>, and/or other processes as described herein. In some aspects, executing instructions may include running the instructions, converting the instructions, compiling the instructions, and/or interpreting the instructions, among other examples.

In some aspects, UE <NUM> may include means for receiving information indicating whether a reference signal is associated with a full-duplex operation; means for receiving the reference signal; means for transmitting feedback based at least in part on the reference signal and the information indicating whether the reference signal is associated with the full-duplex operation; means for receiving a set of reference signals on a respective set of beams; means for determining that the set of beams are suitable for full-duplex communication by the UE; means for transmitting information indicating a set of reference signal identifiers corresponding to the set of reference signals based at least in part on the set of beams being suitable for full-duplex communication by the UE; means for receiving information indicating a set of reference signal identifiers associated with a set of reference signals transmitted using a second set of transmit beams, wherein a beam from the first set of transmit beams and a beam from the second set of transmit beams can be used jointly for the full-duplex operation; means for selecting another beam, associated with a receive-only condition or a transmit/receive condition, for the full-duplex operation; means for selecting another beam, associated with a transmit-only condition or a transmit/receive condition, for the full-duplex operation; means for selecting another beam, associated with a transmit-only condition, a receive-only condition, or a transmit/receive condition, for the full-duplex operation; means for determining whether a receive beam corresponding to the reference signal is associated with a transmit-only condition, a receive-only condition, or a transmit/receive condition, wherein the feedback indicates whether the receive beam is associated with the transmit-only condition, the receive-only condition, or the transmit/receive condition, and wherein the feedback is based at least in part on the determination; means for determining whether a receive beam corresponding to the reference signal is associated with a transmit/receive condition, wherein the feedback indicates whether the receive beam is associated with the transmit/receive condition; and/or the like. In some aspects, such means may include one or more components of UE <NUM> described in connection with <FIG>, such as controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, and/or the like.

In some aspects, base station <NUM> may include means for transmitting information indicating whether a reference signal is associated with a full-duplex operation; means for transmitting the reference signal; means for receiving, from a UE, feedback based at least in part on the reference signal and the information indicating whether the reference signal is associated with the full-duplex operation; means for transmitting a set of reference signals on a respective set of beams; means for receiving information indicating a set of reference signal identifiers corresponding to the set of reference signals based at least in part on the set of beams being suitable for full-duplex communication by the UE; means for transmitting information indicating a set of reference signal identifiers for a set of reference signals transmitted using a second set of transmit beams, wherein a beam from the first set of transmit beams and a beam from the second set of transmit beams can be used jointly for the full-duplex operation; and/or the like. In some aspects, such means may include one or more components of base station <NUM> described in connection with <FIG>, such as antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, and/or the like.

<FIG> is a diagram illustrating an example <NUM> of physical channels and reference signals in a wireless network, in accordance with the present disclosure. As shown in <FIG>, downlink channels and downlink reference signals may be transmitted from a base station <NUM> to a UE <NUM>, and uplink channels and uplink reference signals may be transmitted from a UE <NUM> to a base station <NUM>.

As shown, a downlink channel may include a physical downlink control channel (PDCCH) that carries downlink control information (DCI), a physical downlink shared channel (PDSCH) that carries downlink data, or a physical broadcast channel (PBCH) that carries system information, among other examples. In some aspects, PDSCH communications may be scheduled by PDCCH communications. As further shown, an uplink channel may include a physical uplink control channel (PUCCH) that carries uplink control information (UCI), a physical uplink shared channel (PUSCH) that carries uplink data, or a physical random access channel (PRACH) used for initial network access, among other examples. In some aspects, the UE <NUM> may transmit acknowledgement (ACK) or negative acknowledgement (NACK) feedback (e.g., ACK/NACK feedback or ACK/NACK information) in UCI on the PUCCH and/or the PUSCH.

As further shown, a downlink reference signal may include a synchronization signal block (SSB), a channel state information (CSI) reference signal (CSI-RS), a DMRS, or a phase tracking reference signal (PTRS), among other examples. As also shown, an uplink reference signal may include a sounding reference signal (SRS), a DMRS, or a PTRS, among other examples.

An SSB may carry information used for initial network acquisition and synchronization, such as a PSS, an SSS, a PBCH, and a PBCH DMRS. An SSB is sometimes referred to as a synchronization signal/PBCH (SS/PBCH) block. In some aspects, the base station <NUM> may transmit multiple SSBs on multiple corresponding beams, and the SSBs may be used for beam selection.

A CSI-RS may carry information used for downlink channel estimation (e.g., downlink CSI acquisition), which may be used for scheduling, link adaptation, or beam management, among other examples. The base station <NUM> may configure a set of CSI-RSs for the UE <NUM>, and the UE <NUM> may measure the configured set of CSI-RSs. Based at least in part on the measurements, the UE <NUM> may perform channel estimation and may report channel estimation parameters to the base station <NUM> (e.g., in a CSI report), such as a CQI, a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a layer indicator (LI), a rank indicator (RI), or an RSRP, among other examples. The base station <NUM> may use the CSI report to select transmission parameters for downlink communications to the UE <NUM>, such as a number of transmission layers (e.g., a rank), a precoding matrix (e.g., a precoder), an MCS, or a refined downlink beam (e.g., using a beam refinement procedure or a beam management procedure), among other examples.

A DMRS may carry information used to estimate a radio channel for demodulation of an associated physical channel (e.g., PDCCH, PDSCH, PBCH, PUCCH, or PUSCH). The design and mapping of a DMRS may be specific to a physical channel for which the DMRS is used for estimation. DMRSs are UE-specific, can be beamformed, can be confined in a scheduled resource (e.g., rather than transmitted on a wideband), and can be transmitted only when necessary. As shown, DMRSs are used for both downlink communications and uplink communications.

A PTRS may carry information used to compensate for oscillator phase noise. Typically, the phase noise increases as the oscillator carrier frequency increases. Thus, PTRSs can be utilized at high carrier frequencies, such as millimeter wave frequencies, to mitigate phase noise. The PTRS may be used to track the phase of the local oscillator and to enable suppression of phase noise and common phase error. As shown, PTRSs are used for both downlink communications (e.g., on the PDSCH) and uplink communications (e.g., on the PUSCH).

An SRS may carry information used for uplink channel estimation, which may be used for scheduling, link adaptation, precoder selection, or beam management, among other examples. The base station <NUM> may configure one or more SRS resource sets for the UE <NUM>, and the UE <NUM> may transmit SRSs on the configured SRS resource sets. An SRS resource set may have a configured usage, such as uplink CSI acquisition, downlink CSI acquisition for reciprocity-based operations, uplink beam management, among other examples. The base station <NUM> may measure the SRSs, may perform channel estimation based at least in part on the measurements, and may use the SRS measurements to configure communications with the UE <NUM>.

<FIG> is a diagram illustrating an example <NUM> of a full duplex (FD) zone, a non-FD zone, and self-interference associated with FD communications, in accordance with the present disclosure. As shown, example <NUM> includes a BS (e.g., BS <NUM> and/or the like), a UE1 (e.g., UE <NUM> and/or the like), and a UE2 (e.g., UE <NUM> and/or the like). In some aspects, the BS may be capable of FD communication. FD communication may include contemporaneous uplink and downlink communications using the same resources. For example, the BS may perform a downlink (DL) transmission to a UE1 (shown by reference number <NUM>) and may receive an uplink (UL) transmission from a UE2 (shown by reference number <NUM>) using the same frequency resources and at least partially overlapping in time.

As shown by reference number <NUM>, the DL transmission from the BS may self-interfere with the UL transmission to the BS. This may be caused by a variety of factors, such as the higher transmit power for the DL transmission (as compared to the UL transmission), radio frequency bleeding, and/or the like. Furthermore, as shown by reference number <NUM>, the UL transmission to the BS from the UE2 may interfere with the DL transmission from the BS to the UE1, thereby diminishing DL performance of the UE1.

An FD zone is shown by reference number <NUM> and a non-FD zone is shown by reference number <NUM>. "FD zone" may refer to a time period and/or a frequency region in which a wireless communication device (e.g., a BS <NUM>, a UE <NUM>, a node, a wireless communication device, and/or the like) performs FD communication, and "non-FD zone" may refer to a time period and/or a frequency region in which a wireless communication device performs non-FD (e.g., half-duplex) communication. The FD zone may be associated with higher self-interference, and therefore a lower signal-to-interference-plus-noise ratio (SINR), than the non-FD zone. In some cases, flexible time division duplexing (TDD) may be used to enable FD communication. For example, the configuration of uplink transmissions and downlink receptions (e.g., antenna panels used for such uplink transmissions and downlink receptions, respective proportions of downlink and uplink traffic, downlink-only or uplink-only operation, and/or the like) may vary over time.

A base station may transmit reference signals using different transmit beams to facilitate beam selection, reselection, and/or the like by a UE. For example, the UE may perform measurements on the reference signals (e.g., a Layer <NUM> reference signal received power (L1-RSRP) measurement, an L1 signal to interference plus noise ratio (L1-SINR) measurement, and/or the like). The UE may select one or more beams for communication with the base station, and may report information indicating the one or more selected beams. For example, the UE may select a set of beams associated with a highest measurement value, and may report reference signal identifiers corresponding to reference signals transmitted on the set of beams.

In some aspects, a UE may select beams for FD operation. For example, the UE may select one downlink beam for downlink reception (i.e., a receive beam), and may select another downlink beam for uplink transmission concurrently with the downlink reception (i.e., a transmit beam). Communication in FD by a UE or a base station may be referred to as an FD operation. However, not all downlink beams carrying a reference signal are suitable for FD communication. For example, if the UE were to select a first beam and a second beam that are transmitted by a same antenna panel of the base station, then the base station may not be able to achieve spatial diversity for the first beam and the second beam, thereby rendering FD communication impractical or sub-optimal due to self-interference at the base station. As another example, two reported reference signals may be associated with one or more UE receive beams that cannot be used for FD communication, for example, due to the two reference signals being associated with the same UE receive beam, different UE receive beams on the same antenna panel, or UE receive beams that cannot be used for uplink transmission by the UE. As a third example, the UE may select and report a first beam and a second beam that cannot be used by the base station for reception, meaning that FD communication cannot be performed using only the first beam and the second beam. The selection of beams that are incompatible with FD communication may waste time and resources associated with beam selection and reporting, and may cause interruption of traffic to be communicated as part of the FD communication.

Some techniques and apparatuses described herein provide indication of reference signal groupings based at least in part on an FD capability of a transmitter of the reference signals. For example, the transmitter may provide information indicating that a set of reference signals are to be used for beam selection for an FD operation, thus enabling the UE to select reference signals on beams that are compatible with FD operation by the UE. As another example, the transmitter may provide information indicating reference signals transmitted on a set of beams that can be jointly used for an FD operation (e.g., any pair of beams selected from the set of beams are suitable for the FD operation). As yet another example, the transmitter may provide information indicating reference signals transmitted on a set of beams that cannot be jointly used for an FD operation. In such a case, beams corresponding to different sets of beams can be used for an FD operation. As still another example, the transmitter may provide information indicating whether a beam used to transmit a reference signal is capable of being used or is preferred to be used as a receive-only beam, a transmit-only beam, or a transmit and/or receive (transmit/receive) beam. Some techniques and apparatuses described herein provide for a UE to indicate whether a receive beam, associated with a reported reference signal identifier, is capable of being used or is preferred to be used as a receive-only beam, a transmit-only beam, or a transmit or receive (transmit/receive) beam.

By providing information indicating whether beams can be used for an FD operation, the transmitter (e.g., the base station) facilitates selection, by the UE, of beams for the FD operation. Thus, the efficiency and accuracy of selection of beams for the FD operation is improved, thereby increasing throughput and reducing interference and traffic interruption at the UE and the transmitter.

<FIG> is a diagram illustrating an example <NUM> associated with reference signal grouping for an FD operation, in accordance with the present disclosure. As shown in <FIG>, a base station <NUM> and a UE <NUM> are configured to communicate with one another. In example <NUM>, the base station may be considered a transmitter, since the base station transmits a set of reference signals on a respective set of beams. However, the techniques described with regard to example <NUM> can be applied for any transmitter that is capable of transmitting a reference signal, such as another UE in a sidelink operation.

As show, the BS <NUM> is configured to transmit, and the UE <NUM> is configured to receive, information <NUM> indicating whether an RS is associated with an FD operation. For example, the information <NUM> indicates whether a transmit beam used by the BS <NUM> to transmit the reference signal can be selected by the UE <NUM> for an FD operation. In some aspects, the BS <NUM> is configured to transmit the information <NUM> for a plurality of RSs to be transmitted on respective beams. Thus, the UE <NUM> can select multiple beams for an FD operation based at least in part on the information <NUM>.

In some aspects, the BS <NUM> is configured to provide the information <NUM> in an RS resource configuration (also referred to as a reference signal configuration) for a plurality of RSs, such as a CSI-ResourceConfig configuration. In other aspects, the BS <NUM> is configured to provide the information <NUM> in a configuration specific to an RS (e.g., an individual RS resource configuration), such as a non-zero-power channel state information reference signal (NZP-CSI-RS) resource configuration.

In some aspects, the information <NUM> indicates that the purpose of an RS is for FD beam selection. For example, the information <NUM> indicates that a beam used to transmit the RS can be used by the BS <NUM> for an FD operation (e.g., that the beam can be used as a transmit beam at the BS <NUM> and a receive beam at the BS <NUM>). In this case, the information <NUM> is configured in an RS resource configuration for a plurality of RSs that can be used or selected for the FD operation (e.g., a CSI-ResourceConfig and/or the like).

In some aspects, the information <NUM> indicates a set of RSs (e.g., a group of RSs) from which multiple beams can be selected for an FD operation. For example, the information <NUM> indicates a set of two or more RSs, and all subsets of RSs, of the two or more RSs, are transmitted on beams that can be used for FD operation by the BS <NUM>. <FIG> is a diagram illustrating an example <NUM> of RS groups for FD beam selection, in accordance with the present disclosure. As shown, example <NUM> includes an RS group <NUM> comprising RSs <NUM>, <NUM>, <NUM>, and <NUM>, and an RS group <NUM> comprising RSs <NUM>, <NUM>, <NUM>, and <NUM>. Any subset of the RSs configured in RS group <NUM> (e.g., RS <NUM> and RS <NUM>, RS <NUM> and RS <NUM>, RS <NUM> and RS <NUM>, RS <NUM> and RS <NUM>, RS <NUM> and RS <NUM>, or RS <NUM> and RS <NUM>, as shown by reference number <NUM>), can be used for FD operation by the BS <NUM>, and any subset of the RSs configured in RS group <NUM> can be used for FD operation by the BS <NUM>. For example, the RSs of an RS group may be transmitted using beams associated with different TRPs or different antenna panels such that any pair of the RSs of the RS group can be selected for the FD operation. The RS groups may be indicated as part of an RS resource configuration for an RS group.

In some aspects, RSs selected from different RS groups may not be usable for FD operation (e.g., may not be guaranteed to be usable for the FD operation), as shown by reference number <NUM>. For example, RSs selected from different RS groups may be associated with a same TRP, a same antenna panel, a same transmit beam at the BS <NUM>, and/or the like, which may render the RSs impractical for FD operation.

In some aspects, the information <NUM> may indicate sets of RSs (e.g., groups of RSs), and beams may be selectable from different sets of RSs for FD operation. For example, the information <NUM> may indicate two or more sets of one or more RSs. A beam selected from a first set of RSs and a beam selected from the second set of RSs may be usable for FD operation, whereas two beams selected from a single set of RSs may not be usable for FD operation. <FIG> is a diagram illustrating an example <NUM> of RS groups for FD beam selection, in accordance with the present disclosure. As shown, example <NUM> includes an RS group <NUM> comprising RSs <NUM>, <NUM>, <NUM>, and <NUM>, and an RS group <NUM> comprising RSs <NUM>, <NUM>, <NUM>, and <NUM>. Subsets of the RSs configured in RS group <NUM> may or may not be usable for FD operation by the BS <NUM>, and subsets of the RSs configured in RS group <NUM> may or may not be usable for FD operation by the BS <NUM>, as shown by reference number <NUM>. For example, the RSs of an RS group may be transmitted using beams associated with a same TRP or a same antenna panel such that the RSs of the RS group may not be suitable for the FD operation. As shown by reference number <NUM>, RSs selected from different RS groups may be usable for an FD operation. For example, the FD groups may be configured such that RSs from different FD groups are associated with different TRPs or different antenna panels, and are therefore selectable for FD operation.

In some aspects, the information <NUM> may indicate whether a beam used to transmit an RS is associated with a receive-only condition, a transmit-only condition, or a transmit or receive (transmit/receive) condition. A receive-only condition may indicate that a transmit beam used to transmit an RS is capable only of receiving data communications or is preferred to be used for receiving data communications. A transmit-only condition may indicate that a transmit beam used to transmit an RS is capable only of transmitting data communications or control communications, or is preferred to be used for transmitting data communications or control communications. A transmit/receive condition may indicate that a transmit beam used to transmit an RS is capable of receiving and transmitting data communications or control communications. The UE <NUM> may select a set of beams for an FD operation based at least in part on whether the set of beams are associated with the receive-only condition, the transmit-only condition, or the transmit/receive condition. For example, the UE <NUM> may select a pair of beams that are both associated with the transmit/receive condition, a first beam associated with the transmit-only condition and a second beam associated with the receive-only condition, and/or the like. For an RS whose transmit beam is associated with a transmit-only condition, the UE <NUM> may select a corresponding UE beam that is at least capable of reception (e.g., a UE beam associated with a receive-only condition or a transmit/receive condition). For an RS whose transmit beam is associated with a receive-only condition, the UE <NUM> may select a corresponding UE beam that is at least capable of transmission (e.g., a UE beam associated with a transmit-only condition or a transmit/receive condition). For an RS whose transmit beam is associated with a transmit/receive condition, the UE <NUM> may select a corresponding UE beam associated with a receive-only condition, a transmit-only condition, or a transmit/receive condition.

Returning to <FIG>, as shown by reference number <NUM>, the BS <NUM> is configured to transmit a plurality of RSs. For example, the BS <NUM> may transmit the plurality of RSs on respective beams. An RS may include, for example, a CSI-RS, an SSB, a positioning reference signal (PRS), a combination thereof, and/or the like. As shown by reference number <NUM>, the UE <NUM> is configured to receive the plurality of RSs on a respective set of beams. For example, the UE <NUM> may generate receive beams, and may receive the plurality of RSs on the generated receive beams.

As shown by reference number <NUM>, the UE <NUM> is configured to determine feedback for the plurality of RSs. In some aspects, the feedback may indicate measurements for the plurality of RSs, such as L1-RSRP measurements, L1-SINR measurements, and/or the like. In some aspects, the feedback may indicate one or more selected beams. For example, the UE <NUM> may select a set of beams based at least in part on measurements performed on the set of beams. In some aspects, as shown by reference number <NUM>, the UE <NUM> may select the set of beams for FD operation. For example, the UE <NUM> may select the set of beams based at least in part on measurements on RSs corresponding to the set of beams. In some aspects, the UE <NUM> may select the set of beams based at least in part on the RS groups described with regard to <FIG> and <FIG>.

As shown by reference number <NUM>, the UE <NUM> is configured to transmit, and the BS <NUM> is configured to receive, feedback regarding the plurality of RSs transmitted by the BS <NUM>. For example, the UE <NUM> is configured to transmit information indicating a set of RSs selected based at least in part on measurements on the set of RSs, a set of RSs selected for FD operation based at least in part on the information <NUM> (as shown by reference number <NUM>), and/or the like.

In some aspects, as shown by reference number <NUM>, the feedback includes or is associated with information indicating whether a receive beam, used by the UE <NUM> to receive an RS associated with the feedback, is associated with a transmit-only condition, a receive-only condition, or a transmit-receive condition. A receive-only condition may indicate that a receive beam used to receive an RS is capable of receiving data communications or control communications or is preferred to be used for receiving data communications or control communications. A transmit-only condition may indicate that a receive beam used to receive an RS is capable only of transmitting control communications, or is preferred to be used for transmitting control communications. A transmit/receive condition indicates that a receive beam used to receive an RS is capable of receiving and transmitting data communications or control communications. In some aspects, the feedback shown by reference number <NUM> indicates whether a receive beam is associated with a transmit/receive condition, a receive-only condition, or a transmit-receive condition, based at least in part on an RS received via the receive beam being associated with a transmit/receive condition.

As shown by reference number <NUM>, the UE <NUM> and the BS <NUM> are configured to communicate using the selected beams shown by reference number <NUM>. For example, the UE <NUM> and the BS <NUM> are configured to perform the FD operation using the selected beams. In this case, the BS <NUM> is configured to determine whether the selected beams indicated by the UE <NUM> in the feedback shown by reference number <NUM> are suitable for FD operation, and if so, configures the selected beams for FD operation. Thus, the UE <NUM> and the BS <NUM> are configured to select beams for FD operation based at least in part on reference signals shown by reference number <NUM> and information <NUM> indicating whether the reference signals shown by reference number <NUM> are suitable for FD operation. In this way, the likelihood of selection of unsuitable beams for FD operation is reduced, thereby improving throughput and reducing interruption of communications associated with improper beam selection.

<FIG> is a diagram illustrating an example process <NUM> performed, for example, by a UE, in accordance with the present disclosure. Example process <NUM> is an example where the UE (e.g., UE <NUM> and/or the like) performs operations associated with reference signal grouping for full-duplex operation.

As shown in <FIG>, in some aspects, process <NUM> includes receiving information indicating whether a reference signal is associated with a full-duplex operation (block <NUM>). For example, the UE (e.g., using antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, and/or the like) is configured to receive information indicating whether a reference signal is associated with a full-duplex operation, as described above.

As further shown in <FIG>, in some aspects, process <NUM> includes receiving the reference signal (block <NUM>). For example, the UE (e.g., using antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, and/or the like) is configured to receive the reference signal, as described above.

As further shown in <FIG>, in some aspects, process <NUM> includes transmitting feedback based at least in part on the reference signal and the information indicating whether the reference signal is associated with the full-duplex operation (block <NUM>). For example, the UE (e.g., using antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, and/or the like) is configured to transmit feedback based at least in part on the reference signal and the information indicating whether the reference signal is associated with the full-duplex operation, as described above.

In a first aspect, the reference signal is transmitted on a beam, and the information indicating whether the reference signal is associated with the full-duplex operation indicates whether the beam is associated with the full-duplex operation.

In a second aspect, alone or in combination with the first aspect, the reference signal is at least one of a channel state information reference signal, a synchronization signal block, or a positioning reference signal.

In a third aspect, alone or in combination with one or more of the first and second aspects, the information indicating whether the reference signal is associated with the full-duplex operation indicates that the reference signal is for full-duplex beam selection.

Process <NUM> includes receiving a set of reference signals on a respective set of beams; determining that the set of beams are suitable for full-duplex communication by the UE; and transmitting information indicating a set of reference signal identifiers corresponding to the set of reference signals based at least in part on the set of beams being suitable for full-duplex communication by the UE.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, all subsets of beams of the set of beams are suitable for full-duplex communication by the UE.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the information indicating whether the reference signal is associated with the full-duplex operation is indicated in a reference signal configuration for the reference signal.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the information indicating whether the reference signal is associated with the full-duplex operation indicates a set of reference signals transmitted using a set of transmit beams that can be used for the full-duplex operation.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, all subsets of beams of the set of transmit beams are suitable for full-duplex communication by a base station that transmits the set of reference signals.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the information indicating whether the reference signal is associated with the full-duplex operation is indicated in a reference signal configuration for the set of reference signals.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the information indicating whether the reference signal is associated with the full-duplex operation is indicated in reference signal configurations that are each specific to a respective reference signal of the set of reference signals.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the information indicating whether the reference signal is associated with the full-duplex operation indicates a set of reference signals transmitted using a set of transmit beams that cannot be used jointly for the full-duplex operation.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the set of transmit beams are all associated with a same transmit-receive point or a same antenna panel.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, process <NUM> includes receiving information indicating a set of reference signal identifiers associated with a set of reference signals transmitted using a second set of transmit beams, wherein a beam from the first set of transmit beams and a beam from the second set of transmit beams can be used jointly for the full-duplex operation.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the information indicating whether the reference signal is associated with the full-duplex operation is indicated in a reference signal configuration for the set of reference signals.

In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the information indicating whether the reference signal is associated with the full-duplex operation is indicated in reference signal configurations that are specific to respective reference signals of the set of reference signals.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the information indicating whether the reference signal is associated with the full-duplex operation indicates whether a beam corresponding to the reference signal is associated with a transmit-only condition, a receive-only condition, or a transmit/receive condition.

In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, process <NUM> includes selecting another beam, associated with a receive-only condition or a transmit/receive condition, for the full-duplex operation.

In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, process <NUM> includes selecting another beam, associated with a transmit-only condition or a transmit/receive condition, for the full-duplex operation.

In a nineteenth aspect, alone or in combination with one or more of the first through eighteenth aspects, process <NUM> includes selecting another beam, associated with a transmit-only condition, a receive-only condition, or a transmit/receive condition, for the full-duplex operation.

In a twentieth aspect, alone or in combination with one or more of the first through nineteenth aspects, process <NUM> includes determining whether a receive beam corresponding to the reference signal is associated with a transmit-only condition, a receive-only condition, or a transmit/receive condition, wherein the feedback indicates whether the receive beam is associated with the transmit-only condition, the receive-only condition, or the transmit/receive condition, and wherein the feedback is based at least in part on the determination.

In a twenty-first aspect, alone or in combination with one or more of the first through twentieth aspects, process <NUM> includes determining whether a receive beam corresponding to the reference signal is associated with a transmit/receive condition, wherein the feedback indicates whether the receive beam is associated with the transmit/receive condition.

<FIG> is a diagram illustrating an example process <NUM> performed, for example, by a base station, in accordance with the present disclosure. Example process <NUM> is an example where the base station (e.g., base station <NUM> and/or the like) performs operations associated with reference signal grouping for full-duplex operation.

As shown in <FIG>, in some aspects, process <NUM> includes transmitting information indicating whether a reference signal is associated with a full-duplex operation (block <NUM>). For example, the base station (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, and/or the like) is configured to transmit information indicating whether a reference signal is associated with a full-duplex operation, as described above.

As further shown in <FIG>, in some aspects, process <NUM> includes transmitting the reference signal (block <NUM>). For example, the base station (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, and/or the like) is configured to transmit the reference signal, as described above. In some aspects, the base station is configured to transmit a plurality of reference signals on respective beams. In some aspects, the base station is configured to transmit a plurality of reference signals on one or more beams. For example, two or more reference signals may be transmitted on a same beam.

As further shown in <FIG>, in some aspects, process <NUM> includes receiving, from a UE, feedback based at least in part on the reference signal and the information indicating whether the reference signal is associated with the full-duplex operation (block <NUM>). For example, the base station (e.g., using antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, and/or the like) is configured to receive, from a UE, feedback based at least in part on the reference signal and the information indicating whether the reference signal is associated with the full-duplex operation, as described above.

Process <NUM> includes transmitting a set of reference signals on a respective set of beams; and receiving information indicating a set of reference signal identifiers corresponding to the set of reference signals based at least in part on the set of beams being suitable for full-duplex communication by the UE.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, all subsets of beams of the set of transmit beams are suitable for full-duplex communication by the base station.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, process <NUM> includes transmitting information indicating a set of reference signal identifiers for a set of reference signals transmitted using a second set of transmit beams, wherein a beam from the first set of transmit beams and a beam from the second set of transmit beams can be used jointly for the full-duplex operation.

In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the feedback indicates whether a receive beam corresponding to the reference signal is associated with a transmit-only condition, a receive-only condition, or a transmit/receive condition.

In an eighteenth aspect, alone or in combination with one or more of the first through seventeenth aspects, the feedback indicates whether a receive beam corresponding to the reference signal is associated with a transmit/receive condition.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms The scope of the present invention is defined by the scope of the appended claims.

Claim 1:
An apparatus for wireless communication at a user equipment, UE (<NUM>), comprising:
a memory (<NUM>); and
one or more processors (<NUM>), coupled to the memory (<NUM>), configured to:
receive information indicating whether a reference signal is associated with a full-duplex operation;
receive the reference signal; and
transmit feedback for the reference signal based at least in part on the reference signal and the information indicating whether the reference signal is associated with the full-duplex operation,
wherein the information indicating whether the reference signal is associated with the full-duplex operation indicates that the reference signal is for full-duplex beam selection, and
wherein the one or more processors (<NUM>) are further configured to:
receive a set of reference signals on a set of beams;
determine that the set of beams are suitable for full-duplex communication by the UE (<NUM>); and
transmit information indicating a set of reference signal identifiers corresponding to the set of reference signals based at least in part on the set of beams being suitable for full-duplex communication by the UE (<NUM>).