Downlink control information for indicating a transmission configuration indication state associated with a common beam

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may transmit, and a user equipment (UE) may receive, downlink control information (DCI) that indicates a transmission configuration indication (TCI) state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only. The UE and the base station may communicate on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI. Numerous other aspects are provided.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for downlink control information (DCI) for indicating a transmission configuration indication (TCI) state associated with a common beam.

BACKGROUND

SUMMARY

In some aspects, a method of wireless communication performed by a user equipment (UE) includes receiving, from a base station, downlink control information (DCI) that indicates a transmission configuration indication (TCI) state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and communicating with the base station on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

In some aspects, a method of wireless communication performed by a base station includes transmitting, to a UE, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and communicating with the UE on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

In some aspects, a UE for wireless communication includes a memory and one or more processors, coupled to the memory, configured to: receive, from a base station, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and communicate with the base station on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

In some aspects, a base station for wireless communication includes a memory and one or more processors, coupled to the memory, configured to: transmit, to a UE, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and communicate with the UE on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a UE, cause the UE to: receive, from a base station, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and communicate with the base station on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a base station, cause the base station to: transmit, to a UE, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and communicate with the UE on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

In some aspects, an apparatus for wireless communication includes means for receiving, from a base station, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and means for communicating with the base station on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

In some aspects, an apparatus for wireless communication includes means for transmitting, to a UE, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and means for communicating with the UE on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

DETAILED DESCRIPTION

In some aspects, the UE120includes means for receiving, from base station110, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only and/or means for communicating with the base station110on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI. The means for the UE120to perform operations described herein may include, for example, one or more of antenna252, demodulator254, MIMO detector256, receive processor258, transmit processor264, TX MIMO processor266, modulator254, controller/processor280, or memory282.

In some aspects, the base station110includes means for transmitting, to the UE120, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only and/or means for communicating with the UE120on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI. The means for the base station110to perform operations described herein may include, for example, one or more of transmit processor220, TX MIMO processor230, modulator232, antenna234, demodulator232, MIMO detector236, receive processor238, controller/processor240, memory242, or scheduler246.

FIG.3is a diagram illustrating an example300of using beams for communications between a base station and a UE, in accordance with the present disclosure. As shown inFIG.3, a base station110and a UE120may communicate with one another in a wireless network (e.g., wireless network100).

The base station110may transmit to UEs120located within a coverage area of the base station110. The base station110and the UE120may be configured for beamformed communications, where the base station110may transmit in the direction of the UE120using a directional base station transmit beam (e.g., a downlink transmit beam), and the UE120may receive the transmission using a directional UE receive beam (e.g., a downlink receive beam). Each downlink transmit beam may have an associated beam ID, beam direction, or beam symbols, among other examples. The base station110may transmit downlink communications to one or more UEs120via one or more downlink transmit beams305.

The UE120may attempt to receive downlink transmissions via one or more downlink receive beams310, which may be configured using different beamforming parameters at receive circuitry of the UE120. The UE120may identify a particular downlink transmit beam305, shown as downlink transmit beam305-A, and a particular downlink receive beam310, shown as downlink receive beam310-A, that provide relatively favorable performance (e.g., that have a best channel quality of the different measured combinations of downlink transmit beams305and downlink receive beams310). In some examples, the UE120may transmit an indication of which downlink transmit beam305is identified by the UE120as a preferred downlink transmit beam, which the base station110may select for transmissions to the UE120. The UE120may thus attain and maintain a beam pair link (BPL) with the base station110for downlink communications (for example, a combination of the downlink transmit beam305-A and the downlink receive beam310-A), which may be further refined and maintained in accordance with one or more established beam refinement procedures.

A downlink beam, such as a downlink transmit beam305or a downlink receive beam310, may be associated with a TCI state. A TCI state may indicate a directionality or a characteristic of the downlink beam, such as one or more quasi co-location (QCL) properties of the downlink beam. A QCL property may include, for example, a Doppler shift, a Doppler spread, an average delay, a delay spread, or spatial receive parameters, among other examples. In some examples, each downlink transmit beam305may be associated with a synchronization signal block (SSB), and the UE120may indicate a preferred downlink transmit beam305by transmitting uplink transmissions in resources of the SSB that are associated with the preferred downlink transmit beam305. A particular SSB may have an associated TCI state (e.g., for an antenna port or for beamforming). The base station110may, in some examples, indicate a downlink transmit beam305based at least in part on antenna port QCL properties that may be indicated by the TCI state. A TCI state may be associated with one downlink reference signal set (e.g., an SSB and an aperiodic, periodic, or semi-persistent channel state information reference signal (CSI-RS)) for different QCL types (e.g., QCL types for different combinations of Doppler shift, Doppler spread, average delay, delay spread, or spatial receive parameters, among other examples). In cases where the QCL type indicates spatial receive parameters, the QCL type may correspond to analog receive beamforming parameters of a downlink receive beam310at the UE120. Thus, the UE120may select a corresponding downlink receive beam310from a set of BPLs based at least in part on the base station110indicating a downlink transmit beam305via a TCI state indication.

The base station110may maintain a set of activated TCI states for downlink shared channel transmissions and a set of activated TCI states for downlink control channel transmissions. The set of activated TCI states for downlink shared channel transmissions may correspond to beams that the base station110uses for downlink transmission on a physical downlink shared channel (PDSCH). The set of activated TCI states for downlink control channel communications may correspond to beams that the base station110may use for downlink transmission on a physical downlink control channel (PDCCH) or in a control resource set (CORESET). The UE120may also maintain a set of activated TCI states for receiving the downlink shared channel transmissions and the CORESET transmissions. If a TCI state is activated for the UE120, then the UE120may have one or more antenna configurations based at least in part on the TCI state, and the UE120may not need to reconfigure antennas or antenna weighting configurations. In some examples, the set of activated TCI states (for example, activated PDSCH TCI states and/or activated CORESET TCI states) for the UE120may be configured by a configuration message, such as a radio resource control (RRC) message.

Similarly, for uplink communications, the UE120may transmit in the direction of the base station110using a directional UE transmit beam (e.g., an uplink transmit beam), and the base station110may receive the transmission using a directional base station receive beam (e.g., an uplink receive beam). Each uplink transmit beam may have an associated beam ID, beam direction, or beam symbols, among other examples. The UE120may transmit uplink communications to the base station110via one or more uplink transmit beams315.

The base station110may receive uplink transmissions from the UE120via one or more uplink receive beams320. The base station110may identify a particular uplink transmit beam315, shown as uplink transmit beam315-A, and a particular uplink receive beam320, shown as uplink receive beam320-A, that provide relatively favorable performance (for example, that have a best channel quality of the different measured combinations of uplink transmit beams315and uplink receive beams320). In some examples, the base station110may transmit an indication of which uplink transmit beam315is identified by the base station110as a preferred uplink transmit beam, which the base station110may select for transmissions from the UE120. The UE120and the base station110may thus attain and maintain a BPL for uplink communications (for example, a combination of the uplink transmit beam315-A and the uplink receive beam320-A), which may be further refined and maintained in accordance with one or more established beam refinement procedures. An uplink beam, such as a UE transmit beam315or a BS receive beam320, may be associated with a spatial relation. A spatial relation may indicate a directionality or a characteristic of the uplink beam, similar to one or more QCL properties, as described above.

Additionally, or alternatively, as shown inFIG.3, an uplink TCI state may be defined for beamformed uplink communications. In such cases, each valid uplink TCI state configuration may contain a source reference signal to indicate an uplink transmit beam for a target uplink communication (e.g., a target uplink reference signal or a target uplink channel). For example, the source reference signal may be a sounding reference signal (SRS), an SSB, and/or a CSI-RS, among other examples, and the target uplink communication may be a physical random access channel (PRACH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), an SRS, and/or a DMRS (e.g., a DMRS for a PUCCH or a PUSCH), among other examples. In this way, supporting uplink TCI states may enable a unified TCI framework for downlink and uplink communications, and/or may enable the base station110to indicate various uplink QCL relationships for an uplink TCI state (e.g., Doppler shift, Doppler spread, average delay, and/or delay spread, among other examples). However, signaling techniques to inform a UE120about which TCI state is to be activated for a particular combination of downlink and/or uplink resources are not clearly defined, which may prevent the base station110and the UE120from implementing a unified TCI framework for downlink and uplink communications.

Furthermore, in multi-beam operation, a UE120and a base station110may perform downlink and/or uplink beam management to establish and/or refine the beam management parameters and/or reference signal parameters used for downlink and/or uplink communication. Accordingly, downlink and/or uplink beam management may enable greater intra-cell mobility (e.g., as a physical orientation of a UE120changes and/or clusters or blocking objects in the channel change, among other examples), may enable greater inter-cell mobility (e.g., when a UE120is handed over from one base station110to another base station110), and/or may enable a greater number of configured TCI states. In some circumstances, however, the beam management parameters and/or reference signal parameters for a UE120may change frequently. For example, a UE120may encounter frequent blockages or may change position or orientation quickly. In these circumstances, significant latency and overhead may occur, thus consuming computing resources. For example, there may be latency and overhead involved in transmitting and measuring reference signals, communicating regarding beam configuration or identity, and/or the like.

When a beam changes, a base station110may switch an active beam configuration from one beam configuration to another beam configuration. For example, the beam configuration may include a downlink beam configuration, an uplink downlink beam configuration, a reference signal beam configuration, and/or the like. This may be referred to as activating the downlink beam configuration, the uplink beam configuration, or the reference signal beam configuration. If higher-layer signaling (e.g., RRC signaling, medium access control (MAC) signaling, such as a MAC control element (MAC-CE), and/or the like) is used to transmit downlink and/or uplink beam activation information and/or reference signal beam activation information, the UE120may experience significant latency while processing the higher-layer signaling and applying an activation command (e.g., a three millisecond activation latency to apply a beam switch or beam activation command that is signaled using a MAC-CE). Furthermore, existing techniques generally activate or otherwise indicate a downlink beam separately from an uplink beam, which introduces additional beam indication overhead and/or latency associated with communicating, processing, and/or applying separate downlink and uplink beam activation commands.

Some aspects described herein relate to techniques and apparatuses whereby a base station may signal, to a UE, a TCI state to be used for downlink and/or uplink communications between the UE and the base station. For example, in some aspects, the TCI state may indicate a common beam associated with one or more downlink and/or uplink signals (e.g., one or more downlink signals, one or more uplink signals, or a combination of one or more downlink signals and one or more uplink signals). In this way, signaling a common beam using a single TCI state indication may reduce beam indication overhead and/or latency relative to approaches in which different beams (e.g., downlink and uplink beams, or beams for different downlink signals and/or different uplink signals) are activated or otherwise indicated separately. Furthermore, the TCI state may be signaled using physical layer signaling, such as DCI, which further reduces latency and/or overhead relative to beam management techniques in which downlink and/or uplink beam activation commands are communicated using higher-layer signaling, such as an RRC message or a MAC-CE.

FIG.4is a diagram illustrating an example400associated with DCI for indicating a TCI state associated with a common beam, in accordance with the present disclosure. As shown inFIG.4, example400includes communication between a base station110and a UE120. In some aspects, the base station110and the UE120may communicate in a wireless network, such as wireless network100. The base station110and the UE120may communicate via a wireless access link, which may include a downlink and an uplink.

In some aspects, as described herein, the base station110and the UE120may communicate on the downlink and the uplink using beamformed communications. For example, on the downlink, the base station110may use a downlink transmit beam to transmit one or more downlink signals to the UE120, and the UE120may use a corresponding downlink receive beam to receive the one or more downlink signals from the base station110. Similarly, on the uplink, the UE120may use an uplink transmit beam to transmit one or more uplink signals to the base station110, and the base station110may use a corresponding uplink receive beam to receive the one or more uplink signals from the UE120. In some aspects, the downlink transmit beam and the corresponding downlink receive beam may be associated with a downlink TCI state, and the uplink transmit beam and the corresponding uplink receive beam may be associated with an uplink TCI state. Additionally, or alternatively, a joint downlink and uplink TCI state may be associated with a common beam to be used to communicate any suitable combination of downlink signals and/or uplink signals.

As shown inFIG.4, and by reference number410, the base station110may transmit, and the UE120may receive, DCI that indicates a TCI state associated with a common beam. As described herein, the common beam may be for joint downlink and uplink communication, for downlink communication only, or for uplink communication only. For example, in some aspects, the TCI state may identify a common beam that the UE120is to use to receive one or more downlink signals from the base station110and/or to transmit one or more uplink signals to the base station110. For example, in some aspects, the TCI state indicated in the DCI may apply to multiple signals, which may include a first number of downlink signals and a second number of uplink signals. For example, the TCI state may apply to multiple downlink signals only (e.g., two or more downlink signals and zero uplink signals), to multiple uplink signals only (e.g., zero downlink signals and two or more uplink signals), or to a combination of downlink and uplink signals (e.g., one or more downlink signals and one or more uplink signals).

In some aspects, in cases where the TCI state applies to one or more downlink signals (e.g., the UE120is to use the common beam associated with the TCI state to receive one or more downlink signals from the base station110), the downlink signal(s) associated with the TCI state may include, for example, a PDCCH, a PDSCH, a CSI-RS, and/or any suitable combination thereof. Additionally, or alternatively, in cases where the TCI state applies to one or more uplink signals (e.g., the UE120is to use the common beam associated with the TCI state to transmit one or more uplink signals to the base station110), the uplink signal(s) associated with the TCI state may include, for example, a PUCCH, a PUSCH, a PRACH, an SRS, and/or any suitable combination thereof. In this way, the DCI may signal one TCI state to indicate a common beam to be used for different signals communicated using the common beam, which may include any suitable combination of downlink signals and/or uplink signals. For example, the TCI state may be associated with a particular SSB, a particular CSI-RS, and/or a particular SRS, among other examples, and a beam corresponding to the particular SSB, CSI-RS, SRS, and/or the like may be used to receive one or more downlink signals and/or to transmit one or more uplink signals.

In some aspects, the DCI that indicates the TCI state may be associated with a DCI format that is associated with indicating the TCI state. For example, one or more wireless communication standards may define various DCI formats for different purposes, such as DCI formats 0_0, 0_1, or 0_2 for PUSCH scheduling, DCI formats 1_0, 1_1, or 1_2 for PDSCH scheduling, DCI format 2_0 to indicate a slot format, DCI format 2_1 to indicate time and/or frequency resources in which no transmissions are intended for the UE120, DCI format 2_2 to indicate transmit power control commands, and/or DCI format 2_3 to indicate transmit power control commands for one or more SRS transmissions, among other examples. Accordingly, in some aspects, the DCI that indicates the TCI state may be associated with a DCI format associated with indicating a TCI state to the UE120(e.g., as defined in a wireless communication standard). In some aspects, the DCI format may include information to schedule one or more downlink and/or uplink signals. In some aspects, information related to scheduling downlink and/or uplink signals may be excluded from the DCI format associated with indicating a TCI state to the UE120.

Alternatively, in some aspects, the DCI that indicates the TCI state may be associated with an existing DCI format (e.g., a DCI format that is defined in one or more wireless communication standards). For example, in some aspects, the TCI state may be indicated in a DCI associated with DCI format 0_0, 0_1, or 0_2 for PUSCH scheduling, DCI format 1_0, 1_1, or 1_2 for PDSCH scheduling, DCI format 2_0 for indicating a slot format, and/or another suitable DCI format. In some aspects, the existing DCI format may include one or more reserved bits and/or one or more configurable fields, which may be used to indicate the TCI state and other related information (e.g., one or more downlink resource identifiers and/or uplink resource identifiers to which the UE120is to apply the joint downlink and uplink TCI state).

In some aspects, contents of the DCI that is used to indicate the TCI state may include an identifier associated with the TCI state and may further include a serving cell identifier and/or a bandwidth part identifier associated with the indicated TCI state. In this way, the UE120may determine a serving cell (e.g., a component carrier) and/or a bandwidth part in which the common beam corresponding to the identifier associated with the TCI state is to be used for downlink and/or uplink communication.

Furthermore, the contents of the DCI that indicates the TCI state may include resource identifiers associated with the downlink and/or uplink signals to which the TCI state applies. For example, in some aspects, the TCI state may be applicable to downlink and uplink control channels (e.g., a joint PDCCH/PUCCH TCI state), in which case the DCI contents may include a CORESET identifier for a downlink control channel and a PUCCH resource identifier for an uplink control channel. In another example, the TCI state may be applicable to downlink and uplink data channels (e.g., a joint PDSCH/PUSCH TCI state), in which case the DCI contents may include a PDSCH resource identifier for a downlink data channel and a PUSCH resource identifier for an uplink data channel. In another example, the TCI state may be applicable to downlink and uplink reference signals (e.g., a joint CSI-RS/SRS TCI state), in which case the DCI contents may include a per CSI-RS resource identifier with an associated CSI-RS resource set identifier and a per SRS resource identifier with an associated SRS resource set identifier. In another example, the TCI state may be applicable to downlink and uplink control and data channels (e.g., a joint PDCCH/PDSCH/PUCCH/PUSCH TCI state), in which case the DCI contents may include a CORESET identifier, a PDSCH resource identifier, a PUCCH resource identifier, and/or a PUSCH resource identifier.

Accordingly, as described above, the TCI state indicated in the DCI may generally apply to any suitable combination of downlink signals (e.g., a PDCCH, PDSCH, and/or CSI-RS) and/or uplink signals (e.g., a PUCCH, PUSCH, PRACH, and/or SRS), and the contents of the DCI may include resource identifiers for the combination of downlink signals and/or uplink signals to which the TCI state applies. For example, the DCI may include a PDCCH resource identifier and a PDSCH resource identifier where the TCI state is associated with downlink signals only, and/or a PUCCH resource identifier and a PUSCH resource identifier where the TCI state is associated with uplink signals only, among other examples.

In some aspects, the TCI state may be associated with a QCL source reference signal per QCL type. For example, as described above, a QCL type may be used to indicate a combination of QCL properties associated with a QCL source reference signal, such as a Doppler shift, a Doppler spread, an average delay, a delay spread, and/or one or more spatial receive parameters, among other examples. Accordingly, a QCL source reference signal may be defined per QCL type, whereby the QCL source reference signal associated with the TCI state may be based at least in part on the QCL type associated with the TCI state. For example, in some aspects, the QCL source reference signal associated with the TCI state may be a downlink reference signal, such as an SSB and/or a CSI-RS, or an uplink reference signal, such as an SRS.

As further shown inFIG.4, and by reference number420, the UE120may activate the common beam to be used to communicate with the base station110on a downlink and/or an uplink based at least in part on the TCI state indicated in the DCI. For example, the UE120may determine one or more downlink and/or uplink signals to be communicated using the common beam associated with the TCI state (e.g., based at least in part on one or more downlink and/or uplink resource identifiers included in the DCI). The UE120may configure one or more antenna elements to receive one or more downlink signals and/or to transmit one or more uplink signals in a direction associated with the common beam corresponding to the TCI state. Accordingly, the UE120may activate the common beam indicated by the TCI state for use in a particular serving cell and/or bandwidth part (e.g., based on a serving cell identifier and/or a bandwidth part identifier included in the DCI). Furthermore, in some aspects, the UE120may determine a QCL source reference signal associated with the TCI state (e.g., an SSB, a CSI-RS, or an SRS) based at least in part on a QCL type associated with the TCI state. In this way, the UE120may use one or more QCL properties associated with the QCL source reference signal to activate or otherwise configure the common beam associated with the TCI state indicated in the DCI.

As further shown inFIG.4, and by reference number430, the UE120and the base station110may communicate one or more signals on the downlink and/or the uplink using the common beam associated with the TCI state indicated in the DCI. For example, in cases where the TCI state is applicable to one or more downlink signals, the TCI state may indicate a downlink receive beam that the UE120is to use to receive a PDCCH, a PDSCH, and/or a CSI-RS that the base station110transmits using a corresponding downlink transmit beam. Additionally, or alternatively, in cases where the TCI state is applicable to one or more downlink signals, the TCI state may indicate an uplink transmit beam that the UE120is to use to transmit a PUCCH, a PUSCH, a PRACH, and/or an SRS that the base station110receives using a corresponding uplink receive beam. Accordingly, as described herein, the DCI may be used to indicate various parameters that relate to a TCI state, which may indicate a common beam to be used to communicate any suitable combination of downlink signals and/or uplink signals between the UE120and the base station110.

FIG.5is a diagram illustrating an example process500performed, for example, by a UE, in accordance with the present disclosure. Example process500is an example where the UE (e.g., UE120) performs operations associated with DCI for indicating a TCI state associated with a common beam.

As shown inFIG.5, in some aspects, process500may include receiving, from a base station, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only (block510). For example, the UE (e.g., using reception component702, depicted inFIG.7) may receive, from a base station, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only, as described above.

As further shown inFIG.5, in some aspects, process500may include communicating with the base station on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI (block520). For example, the UE (e.g., using reception component702, transmission component704, and/or communication component708, depicted inFIG.7) may communicate with the base station on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI, as described above.

In a first aspect, the TCI state applies to multiple signals that are communicated using the common beam.

In a second aspect, alone or in combination with the first aspect, the multiple signals include multiple downlink signals only, multiple uplink signals only, or at least one downlink signal and at least one uplink signal.

In a third aspect, alone or in combination with one or more of the first and second aspects, one or more of the multiple signals are for the downlink and include one or more of a PDCCH, a PDSCH, or a CSI-RS.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, one or more of the multiple signals are for the uplink and include one or more of a PUCCH, a PUSCH, a PRACH, or an SRS.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the DCI is associated with a DCI format that is associated with indicating the TCI state and includes scheduling information for one or more downlink or uplink signals.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the DCI is associated with a DCI format that is associated with indicating the TCI state and does not include scheduling information for one or more downlink or uplink signals.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the TCI state is indicated in one or more reserved bits or one or more fields of the DCI.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the DCI includes an identifier associated with the TCI state and one or more of a serving cell identifier or a bandwidth part identifier associated with the TCI state.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the DCI includes resource identifiers associated with one or more downlink signals or one or more uplink signals that are communicated using the common beam associated with the TCI state.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the resource identifiers include a CORESET identifier and a PUCCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink control channels.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the resource identifiers include a PDSCH resource identifier and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink data channels.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the resource identifiers include a CSI-RS resource identifier and an SRS resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink reference signals.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the resource identifiers include a CORESET identifier, a PUCCH resource identifier, a PDSCH resource identifier, and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink control and data channels.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the resource identifiers include a CORESET identifier and a PDSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink control and data channels.

In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the resource identifiers include a PUCCH resource identifier and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with uplink control and data channels.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the TCI state indicated in the DCI is associated with a QCL source reference signal per QCL type.

In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the QCL source reference signal includes an SSB, a CSI-RS, or an SRS.

FIG.6is a diagram illustrating an example process600performed, for example, by a base station, in accordance with the present disclosure. Example process600is an example where the base station (e.g., base station110) performs operations associated with DCI for indicating a TCI state.

As shown inFIG.6, in some aspects, process600may include transmitting, to a UE, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only (block610). For example, the base station (e.g., using transmission component804, depicted inFIG.8) may transmit, to a UE, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only, as described above.

As further shown inFIG.6, in some aspects, process600may include communicating with the UE on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI (block620). For example, the base station (e.g., using reception component802, transmission component804, and/or communication component808, depicted inFIG.8) may communicate with the UE on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI, as described above.

In a first aspect, the TCI state applies to multiple signals that are communicated using the common beam.

In a second aspect, alone or in combination with the first aspect, the multiple signals include multiple downlink signals only, multiple uplink signals only, or at least one downlink signal and at least one uplink signal.

In a third aspect, alone or in combination with one or more of the first and second aspects, one or more of the multiple signals are for the downlink and include one or more of a PDCCH, a PDSCH, or a CSI-RS.

In a fourth aspect, alone or in combination with one or more of the first through third aspects, one or more of the multiple signals are for the uplink and include one or more of a PUCCH, a PUSCH, a PRACH, or an SRS.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the DCI is associated with a DCI format that is associated with indicating the TCI state and includes scheduling information for one or more downlink or uplink signals.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the DCI is associated with a DCI format that is associated with indicating the TCI state and does not include scheduling information for one or more downlink or uplink signals.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the TCI state is indicated in one or more reserved bits or one or more fields of the DCI.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the DCI includes an identifier associated with the TCI state and one or more of a serving cell identifier or a bandwidth part identifier associated with the TCI state.

In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the DCI includes resource identifiers associated with one or more downlink signals or one or more uplink signals that are communicated using the common beam associated with the TCI state.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the resource identifiers include a CORESET identifier and a PUCCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink control channels.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the resource identifiers include a PDSCH resource identifier and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink data channels.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the resource identifiers include a CSI-RS resource identifier and an SRS resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink reference signals.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the resource identifiers include a CORESET identifier, a PUCCH resource identifier, a PDSCH resource identifier, and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink control and data channels.

In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the resource identifiers include a CORESET identifier and a PDSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink control and data channels.

In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the resource identifiers include a PUCCH resource identifier and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with uplink control and data channels.

In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, the TCI state indicated in the DCI is associated with a QCL source reference signal per QCL type.

In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the QCL source reference signal includes an SSB, a CSI-RS, or an SRS.

FIG.7is a block diagram of an example apparatus700for wireless communication. The apparatus700may be a UE, or a UE may include the apparatus700. In some aspects, the apparatus700includes a reception component702and a transmission component704, which may be in communication with one another (for example, via one or more buses and/or one or more other components). As shown, the apparatus700may communicate with another apparatus706(such as a UE, a base station, or another wireless communication device) using the reception component702and the transmission component704. As further shown, the apparatus700may include a communication component708, among other examples.

The transmission component704may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus706. In some aspects, one or more other components of the apparatus706may generate communications and may provide the generated communications to the transmission component704for transmission to the apparatus706. In some aspects, the transmission component704may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus706. In some aspects, the transmission component704may include one or more antennas, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the UE described above in connection withFIG.2. In some aspects, the transmission component704may be co-located with the reception component702in a transceiver.

The reception component702may receive, from a base station, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only. The communication component708may communicate, or may cause the reception component702and/or the transmission component704to communicate, with the base station on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

The number and arrangement of components shown inFIG.7are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown inFIG.7. Furthermore, two or more components shown inFIG.7may be implemented within a single component, or a single component shown inFIG.7may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown inFIG.7may perform one or more functions described as being performed by another set of components shown inFIG.7.

The transmission component804may transmit, to a UE, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only. The communication component808may communicate, or may cause the reception component802and/or the transmission component804to communicate, with the UE on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

Aspect 1: A method of wireless communication performed by a UE, comprising: receiving, from a base station, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and communicating with the base station on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

Aspect 2: The method of Aspect 1, wherein the TCI state applies to multiple signals that are communicated using the common beam.

Aspect 3: The method of Aspect 2, wherein the multiple signals include multiple downlink signals only, multiple uplink signals only, or at least one downlink signal and at least one uplink signal.

Aspect 4: The method of any of Aspects 2-3, wherein one or more of the multiple signals are for the downlink and include one or more of a PDCCH, a PDSCH, or a CSI-RS.

Aspect 5: The method of any of Aspects 2-4, wherein one or more of the multiple signals are for the uplink and include one or more of a PUCCH, a PUSCH, a PRACH, or an SRS.

Aspect 6: The method of any of Aspects 1-5, wherein the DCI is associated with a DCI format that is associated with indicating the TCI state and includes scheduling information for one or more downlink or uplink signals.

Aspect 7: The method of any of Aspects 1-5, wherein the DCI is associated with a DCI format that is associated with indicating the TCI state and does not include scheduling information for one or more downlink or uplink signals.

Aspect 8: The method of any of Aspects 1-7, wherein the TCI state is indicated in one or more reserved bits or one or more fields of the DCI.

Aspect 9: The method of any of Aspects 1-8, wherein the DCI includes an identifier associated with the TCI state and one or more of a serving cell identifier or a bandwidth part identifier associated with the TCI state.

Aspect 10: The method of any of Aspects 1-9, wherein the DCI includes resource identifiers associated with one or more downlink signals or one or more uplink signals that are communicated using the common beam associated with the TCI state.

Aspect 11: The method of Aspect 10, wherein the resource identifiers include a CORESET identifier and a PUCCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink control channels.

Aspect 12: The method of any of Aspects 10-11, wherein the resource identifiers include a PDSCH resource identifier and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink data channels.

Aspect 13: The method of any of Aspects 10-12, wherein the resource identifiers include a CSI-RS resource identifier and a SRS resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink reference signals.

Aspect 14: The method of any of Aspects 10-13, wherein the resource identifiers include a CORESET identifier, a PUCCH resource identifier, a PDSCH resource identifier, and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink control and data channels.

Aspect 15: The method of any of Aspects 10-14, wherein the resource identifiers include a CORESET identifier and a PDSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink control and data channels.

Aspect 16: The method of any of Aspects 10-15, wherein the resource identifiers include a PUCCH resource identifier and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with uplink control and data channels.

Aspect 17: The method of any of Aspects 1-16, wherein the TCI state indicated in the DCI is associated with a QCL source reference signal per QCL type.

Aspect 18: The method of Aspect 17, wherein the QCL source reference signal includes an SSB, a CSI-RS, or an SRS.

Aspect 19: A method of wireless communication performed by a base station, comprising: transmitting, to a UE, DCI that indicates a TCI state associated with a common beam for joint downlink and uplink communication, downlink communication only, or uplink communication only; and communicating with the UE on one or more of a downlink or an uplink using the common beam associated with the TCI state indicated in the DCI.

Aspect 20: The method of Aspect 19, wherein the TCI state applies to multiple signals that are communicated using the common beam.

Aspect 21: The method of Aspect 20, wherein the multiple signals include multiple downlink signals only, multiple uplink signals only, or at least one downlink signal and at least one uplink signal.

Aspect 22: The method of any of Aspects 20-21, wherein one or more of the multiple signals are for the downlink and include one or more of a PDCCH, a PDSCH, or a CSI-RS.

Aspect 23: The method of any of Aspects 20-22, wherein one or more of the multiple signals are for the uplink and include one or more of a PUCCH, a PUSCH, a PRACH, or an SRS.

Aspect 24: The method of any of Aspects 19-23, wherein the DCI is associated with a DCI format that is associated with indicating the TCI state and includes scheduling information for one or more downlink or uplink signals.

Aspect 25: The method of any of Aspects 19-23, wherein the DCI is associated with a DCI format that is associated with indicating the TCI state and does not include scheduling information for one or more downlink or uplink signals.

Aspect 26: The method of any of Aspects 19-25, wherein the TCI state is indicated in one or more reserved bits or one or more fields of the DCI.

Aspect 27: The method of any of Aspects 19-26, wherein the DCI includes an identifier associated with the TCI state and one or more of a serving cell identifier or a bandwidth part identifier associated with the TCI state.

Aspect 28: The method of any of Aspects 19-27, wherein the DCI includes resource identifiers associated with one or more downlink signals or one or more uplink signals that are communicated using the common beam associated with the TCI state.

Aspect 29: The method of Aspect 28, wherein the resource identifiers include a CORESET identifier and a PUCCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink control channels.

Aspect 30: The method of any of Aspects 28-29, wherein the resource identifiers include a PDSCH resource identifier and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink data channels.

Aspect 31: The method of any of Aspects 28-30, wherein the resource identifiers include a CSI-RS resource identifier and an SRS resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink reference signals.

Aspect 32: The method of any of Aspects 28-31, wherein the resource identifiers include a CORESET identifier, a PUCCH resource identifier, a PDSCH resource identifier, and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink and uplink control and data channels.

Aspect 33: The method of any of Aspects 28-32, wherein the resource identifiers include a CORESET identifier and a PDSCH resource identifier based at least in part on the TCI state being applicable to communications associated with downlink control and data channels.

Aspect 34: The method of any of Aspects 28-33, wherein the resource identifiers include a PUCCH resource identifier and a PUSCH resource identifier based at least in part on the TCI state being applicable to communications associated with uplink control and data channels.

Aspect 35: The method of any of Aspects 19-34, wherein the TCI state indicated in the DCI is associated with a QCL source reference signal per QCL type.

Aspect 36: The method of Aspect 35, wherein the QCL source reference signal includes an SSB, a CSI-RS, or an SRS.