Signaling for configuring downlink transmissions

Methods, systems, and devices for signaling for configuring downlink transmissions are described. A user equipment (UE) may receive a configuration message from a base station indicating that a control resource set (CORESET) for a downlink control channel is associated with a set of transmission configuration indicator (TCI) states. The UE may subsequently receive a control message from the base station activating one or more of the TCI states. The UE may decode the downlink control channel based on the configuration message and the one or more activated TCI states. The UE may identify one or more TCI states (e.g., associated with the CORESET) to apply to a reception of a physical downlink shared channel (PDSCH) transmission. The UE may determine to apply one or more of the TCI states activated by the control message. The UE may determine to apply one or more different TCI states.

FIELD OF TECHNOLOGY

The following relates generally to wireless communications and more specifically to signaling for configuring downlink transmissions.

BACKGROUND

In some wireless communications systems, a base station may transmit control information to a UE via a physical downlink control channel (PDCCH) using a set of resources. The PDCCH may include demodulation reference signals (DMRSs) and coded bits of downlink control information (DCI). A base station may transmit a PDCCH using a physical layer, associated with an antenna port and transmission configuration indicator (TCI) state. In some cases, the reliability of the network may rely on the reliability of each channel which may become unreliable and may adversely impact network performance.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support signaling for configuring downlink transmissions. Generally, the described techniques provide for configuring physical downlink control channel (PDCCH) and physical downlink shared channel (PDSCH) transmissions. More specifically, PDCCH transmissions may by transmitted using a control resource set (CORESET) including one or more resource elements (REs). Each CORESET may be associated with a set of transmission configuration indicator (TCI) states. A base station may transmit a PDCCH or PDSCH transmission according to one or more activated TCI states (e.g., of the set of TCI states associated with CORESET) and the UE may apply the one or more activated TCI states to receive and decode the PDCCH or PDSCH transmissions. The base station may indicate the one or more activated TCI states to the user equipment (UE) to enable the UE to receive and decode the PDCCH or PDSCH transmission.

A method for wireless communication by a UE is described. The method may include identifying that a CORESET for a downlink control channel is associated with a set of multiple TCI states, receiving, from a base station, a control message activating one or more TCI states of the set of multiple TCI states for the CORESET, and decoding the downlink control channel based on the one or more activated TCI states.

An apparatus for wireless communication by a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to identify that a CORESET for a downlink control channel is associated with a set of multiple TCI states, receive, from a base station, a control message activating one or more TCI states of the set of multiple TCI states for the CORESET, and decode the downlink control channel based on the one or more activated TCI states.

Another apparatus for wireless communication by a UE is described. The apparatus may include means for identifying that a CORESET for a downlink control channel is associated with a set of multiple TCI states, means for receiving, from a base station, a control message activating one or more TCI states of the set of multiple TCI states for the CORESET, and means for decoding the downlink control channel based on the one or more activated TCI states.

A non-transitory computer-readable medium storing code for wireless communication by a UE is described. The code may include instructions executable by a processor to identify that a CORESET for a downlink control channel is associated with a set of multiple TCI states, receive, from a base station, a control message activating one or more TCI states of the set of multiple TCI states for the CORESET, and decode the downlink control channel based on the one or more activated TCI states.

Some examples of the method, apparatus, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, a configuration message indicating that the CORESET for the downlink control channel is associated with the set of TCI states.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based on an indication within the control message, that a single TCI state may be activated for the CORESET and identifying a first TCI state that may be activated based on the indication, where the one or more activated TCI states includes the first TCI state.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based on an indication within the control message, that two TCI states may be activated for the CORESET, identifying a first TCI state that may be activated based on the indication, and identifying a second TCI state that may be activated based on the indication, where the one or more activated TCI states includes the first TCI state and the second TCI state.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the control message may include operations, features, means, or instructions for receiving an indication of the one or more activated TCI states, where the indication includes one or more TCI state identifications (IDs).

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the control message may include operations, features, means, or instructions for receiving an indication of the one or more activated TCI states, where the indication includes one or more indices associated with the one or more activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes a first field configured to indicate a first TCI state, a second field configured to indicate a second TCI state, and a third field configured to indicate whether the TCI state of the first TCI state or the first TCI state and the second TCI state may be activated.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the third field is configured to indicate whether the control message includes the second field.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes a dynamic number of fields based on a quantity of activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration message further indicates that the set of multiple TCI states may be mapped using either a frequency division multiplexing (FDM) mapping, a time division multiplexing (TDM) mapping, or a space division multiplexing mapping.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration message further indicates parameters for mapping the set of multiple TCI states using at least two of a FDM mapping scheme, a TDM mapping scheme, and a space division multiplexing mapping scheme and the control message indicates one of the FDM mapping scheme, the TDM mapping scheme, or the space division multiplexing mapping scheme for mapping of the one or more activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes an indication of a group of component carriers (CCs) to which the control message pertains.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message may be a medium access control-control element (MAC-CE).

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration message may be a radio resource control (RRC) message.

A method for wireless communication by a base station is described. The method may include identifying a configuration indicating that a CORESET for a downlink control channel is associated with a set of multiple TCI states, transmitting, to a UE, a configuration message indicating the identified configuration, and transmitting, to the UE, a control message activating one or more TCI states of the set of multiple TCI states for the CORESET.

An apparatus for wireless communication by a base station is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to identify a configuration indicating that a CORESET for a downlink control channel is associated with a set of multiple TCI states, transmit, to a UE, a configuration message indicating the identified configuration, and transmit, to the UE, a control message activating one or more TCI states of the set of multiple TCI states for the CORESET.

Another apparatus for wireless communication by a base station is described. The apparatus may include means for identifying a configuration indicating that a CORESET for a downlink control channel is associated with a set of multiple TCI states, means for transmitting, to a UE, a configuration message indicating the identified configuration, and means for transmitting, to the UE, a control message activating one or more TCI states of the set of multiple TCI states for the CORESET.

A non-transitory computer-readable medium storing code for wireless communication by a base station is described. The code may include instructions executable by a processor to identify a configuration indicating that a CORESET for a downlink control channel is associated with a set of multiple TCI states, transmit, to a UE, a configuration message indicating the identified configuration, and transmit, to the UE, a control message activating one or more TCI states of the set of multiple TCI states for the CORESET.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, a downlink control message via the downlink control channel according to the one or more activated TCI states for the CORESET.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes an indication that a single TCI state may be activated for the CORESET, the indication indicates a first TCI state that may be activated, and the one or more activated TCI states include the first TCI state.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes an indication that two TCI states may be activated for the CORESET, the indication indicates that a first TCI state and a second TCI state may be activated, and the one or more activated TCI states include the first TCI state and the second TCI state.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the configuration message may include operations, features, means, or instructions for transmitting an indication of the one or more activated TCI states, where the indication includes a TCI state ID.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the configuration message may include operations, features, means, or instructions for transmitting an indication of the one or more TCI states, where the indication includes one or more indices associated with the one or more activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes a first field configured to indicate a first TCI state, a second field configured to indicate a second TCI state, and a third field configured to indicate which TCI state of the first TCI state, the second TCI state, or both TCI states may be activated.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes a dynamic number of fields based on a quantity of activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration message further indicates that the set of multiple TCI states may be mapped using either an FDM mapping, a TDM mapping, or a space division multiplexing mapping.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration message further indicates parameters for mapping the set of multiple TCI states using at least two of a FDM mapping scheme, a TDM mapping scheme, and a space division multiplexing mapping scheme and the control message indicates one of the FDM mapping scheme, the TDM mapping scheme, or the space division multiplexing mapping scheme for mapping of the one or more activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message includes an indication of a group of CCs to which the control message pertains.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the control message may be a MAC-CE.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration message may be an RRC message.

A method for wireless communications at a UE is described. The method may include receiving, from a base station, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, receiving a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a physical downlink shared channel (PDSCH) transmission, identifying, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decoding the PDSCH transmission in accordance with the at least one TCI state.

An apparatus for wireless communications at a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a base station, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, receive a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decode the PDSCH transmission in accordance with the at least one TCI state.

Another apparatus for wireless communications at a UE is described. The apparatus may include means for receiving, from a base station, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, means for receiving a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, means for identifying, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and means for decoding the PDSCH transmission in accordance with the at least one TCI state.

A non-transitory computer-readable medium storing code for wireless communications at a UE is described. The code may include instructions executable by a processor to receive, from a base station, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, receive a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decode the PDSCH transmission in accordance with the at least one TCI state.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the identifying may be based on a scheduling offset for the PDSCH transmission that may be larger than a threshold scheduling offset.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the threshold scheduling offset may be a time duration for quasi colocation (QCL).

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, a control message activating two TCI states for the CORESET, where the at least one TCI state to apply to the reception of the PDSCH transmission includes at least one of the two activated TCI states.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based on the scheduling information for the PDSCH transmission, to apply one of the two activated TCI states to the reception of the PDSCH transmission.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying one of the two activated TCI states to apply to the reception of the PDSCH transmission based on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within the control message each indicating one of the two activated TCI states.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining, based on the scheduling information for the PDSCH transmission, to apply both of the two activated TCI states to the reception of the PDSCH transmission.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for decoding the physical downlink control transmission based on the configuration message and at least one of the two activated TCI states.

A method for wireless communications at a UE is described. The method may include receiving, from a base station, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, receiving a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identifying, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decoding the PDSCH transmission in accordance with the at least one TCI state.

An apparatus for wireless communications at a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a base station, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, receive a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decode the PDSCH transmission in accordance with the at least one TCI state.

Another apparatus for wireless communications at a UE is described. The apparatus may include means for receiving, from a base station, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, means for receiving a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, means for identifying, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and means for decoding the PDSCH transmission in accordance with the at least one TCI state.

A non-transitory computer-readable medium storing code for wireless communications at a UE is described. The code may include instructions executable by a processor to receive, from a base station, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, receive a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decode the PDSCH transmission in accordance with the at least one TCI state.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the threshold scheduling offset may be a time duration for QCL.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying one or more CORESETs each associated with a transmission received prior to decoding the PDSCH transmission, determining a subset of the one or more CORESETs that excludes CORESETs of the one or more CORESETs that may be associated with a set of multiple activated TCI states, and identifying a CORESET from the subset of the one or more CORESETs having a CORESET ID with a value less than each CORESET ID of other CORESETs from the subset of the one or more CORESETs, where the at least one TCI state to apply to the reception of the PDSCH transmission includes a TCI state associated with the identified CORESET having the CORESET ID with the value less than each CORESET ID of other CORESETs.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying the CORESET associated with two activated TCI states, where the at least one TCI state to apply to the reception of the PDSCH transmission includes at least one of the two activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying the CORESET may include operations, features, means, or instructions for identifying one or more CORESETs associated with a transmission received prior to identifying the CORESET and determining that a CORESET

ID with a lowest value from each CORESET ID of the one or more CORESETs may be the CORESET ID identifying the CORESET.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining to apply one of the two activated TCI states to the reception of the PDSCH transmission.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying one of the two activated TCI states to apply to the reception of the PDSCH transmission based on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within a control message each indicating one of the two activated TCI states.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining to apply both of the two activated TCI states to the reception of the PDSCH transmission.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for decoding the physical downlink control transmission based on the configuration message and at least one of the two activated TCI states.

A method for wireless communications at a base station is described. The method may include transmitting, to a UE, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, transmitting, to the UE, a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, identifying, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmitting the PDSCH transmission in accordance with the at least one TCI state.

An apparatus for wireless communications at a base station is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, transmit, to the UE, a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmit the PDSCH transmission in accordance with the at least one TCI state.

Another apparatus for wireless communications at a base station is described. The apparatus may include means for transmitting, to a UE, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, means for transmitting, to the UE, a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, means for identifying, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and means for transmitting the PDSCH transmission in accordance with the at least one TCI state.

A non-transitory computer-readable medium storing code for wireless communications at a base station is described. The code may include instructions executable by a processor to transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, transmit, to the UE, a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmit the PDSCH transmission in accordance with the at least one TCI state.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the scheduling information for the PDSCH transmission defines a scheduling offset for the PDSCH transmission that may be larger than a threshold scheduling offset.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the threshold scheduling offset may be a time duration for QCL.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, a control message activating two TCI states for the CORESET, where the at least one TCI state to apply to the reception of the PDSCH transmission includes at least one of the two activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the PDSCH transmission may include operations, features, means, or instructions for transmitting the PDSCH transmission in accordance with one of the two activated TCI states.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying the one of the two activated TCI states to apply to the reception of the PDSCH transmission based on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within the control message each indicating one of the two activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the PDSCH transmission may include operations, features, means, or instructions for transmitting the PDSCH transmission in accordance with both of the two activated TCI states.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting the physical downlink control transmission based on the configuration message and at least one of the two activated TCI states.

A method for wireless communications at a base station is described. The method may include transmitting, to a UE, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, transmitting, to the UE, a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identifying, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmitting the PDSCH transmission in accordance with the at least one TCI state.

An apparatus for wireless communications at a base station is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, transmit, to the UE, a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmit the PDSCH transmission in accordance with the at least one TCI state.

Another apparatus for wireless communications at a base station is described. The apparatus may include means for transmitting, to a UE, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, means for transmitting, to the UE, a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, means for identifying, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and means for transmitting the PDSCH transmission in accordance with the at least one TCI state.

A non-transitory computer-readable medium storing code for wireless communications at a base station is described. The code may include instructions executable by a processor to transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of multiple activated TCI states, transmit, to the UE, a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmit the PDSCH transmission in accordance with the at least one TCI state.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the threshold scheduling offset may be a time duration for QCL.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying the CORESET associated with two activated TCI states, where the at least one TCI state to apply to the reception of the PDSCH transmission includes at least one of the two activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying the CORESET may include operations, features, means, or instructions for identifying one or more CORESETs associated with a transmission transmitted prior to identifying the CORESET and determining that a CORESET ID with a lowest value from each CORESET ID of the one or more CORESETs may be the CORESET ID identifying the CORESET.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the PDSCH transmission may include operations, features, means, or instructions for transmitting the PDSCH transmission in accordance with one of the two activated TCI states.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying the one of the two activated TCI states to apply to the reception of the PDSCH transmission based on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within a control message each indicating one of the two activated TCI states.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the PDSCH transmission may include operations, features, means, or instructions for transmitting the PDSCH transmission in accordance with both of the two activated TCI states.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting the physical downlink control transmission based on the configuration message and at least one of the two activated TCI states.

DETAILED DESCRIPTION

In some wireless communications systems, a base station may transmit control information to a user equipment (UE) via a physical downlink control channel (PDCCH) using a control resource set (CORESET). A CORESET may include one or more resource element groups (REGs) that may include one or more resource elements (REs) for transmitting the PDCCH. A base station may transmit a PDCCH associated with a CORESET using one or more activated transmission configuration indicator (TCI) states. A base station may also transmit a physical downlink shared channel (PDSCH) transmission using one or more activated TCI states. Different TCI states may correspond to QCL relationships with different reference signal transmissions. That is, a UE may measure a reference signal using receive beamforming parameters based on a TCI state indicated for the reference signal transmission from a base station. Therefore, a UE and a base station may each determine the one or more activated TCI states to transmit and receive the downlink transmissions using the one or more activated TCI states.

In some cases, a UE and base station may be configured to use a single TCI state for PDCCH transmissions. Here, the UE and base station may be configured to use one or more activated TCI states for PDCCH transmissions. This may be implemented to realize one or more advantages. For example, two activated TCI states may increase a diversity of the transmissions and therefore a reliability of the transmissions. Here, the base station may be configured to indicate one activated TCI state or more than one activated TCI state (e.g., two activated TCI states) to the UE prior to transmitting a PDCCH transmission. Therefore, the base station and UE may be operable to use more than one activated TCI state for PDCCH transmissions increasing a reliability of the PDCCH transmission when compared to a PDCCH transmission associated with only a single TCI state. As such, supported techniques may include improved network operations and, in some examples, may promote network efficiencies, among other benefits.

The base station may transmit a radio resource control (RRC) message to the UE indicating CORESET configurations. For example, the base station may transmit an RRC message or configuration message to indicate a list of TCI states associated with a CORESET. The base station may subsequently transmit a medium access control-control element (MAC-CE) to activate one or more TCI states for the CORESET. The MAC-CE may be dynamically sized, where the size of the MAC-CE increases as a quantity of activated TCI states increases. Alternatively, the MAC-CE may be a fixed size and may include an indication of a quantity of activated TCI states. In either case, the MAC-CE may indicate one or more activated TCI states (e.g., by TCI state identifiers (IDs), by an index associated with a TCI state). The base station may then transmit a PDCCH transmission using the activated TCI states. The UE may monitor the CORESET for the PDCCH transmission and decode the PDCCH transmission based on the activated TCI states.

The PDCCH transmission may include one or more fields indicating at least one activated TCI state for a PDSCH transmission. The base station may transmit the PDSCH transmission using the indicated TCI states (e.g., indicated within the PDCCH transmission) and the UE may decode the PDSCH transmission based on the indicated TCI states. In some other cases, the UE may not determine which TCI states are indicated for the PDSCH transmission based on an indication within the PDCCH transmission. For example, the PDCCH may fail to include a field indicating one or more activated TCI states for the PDSCH transmission. Here, the UE and base station may use one or more of the activated TCI states associated with the PDCCH transmission for the PDSCH transmission. In another example, a scheduling offset associated with the PDSCH transmission and indicated within the PDCCH transmission may be less than a time duration for QCL. Here, the UE and base station may use a default QCL assumption for the PDSCH transmission that is the QCL relationship or TCI state of the CORESET associated with a monitored search space with the lowest CORESET ID in the latest slot in which one or more CORESETs within the active bandwidth part (BWP) of the base station are monitored by the UE.

Aspects of the disclosure are initially described in the context of a wireless communications system. Aspects of the disclosure are then described in the context of a second wireless communications system, configurations, and process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to signaling for configuring downlink transmissions.

A base station105may transmit PDCCH and PDSCH transmissions to a UE115. The base station105may transmit PDCCH transmissions using a CORESET including one or more REs. Each CORESET may be associated with a set of TCI states. A base station105may transmit a PDCCH or PDSCH transmission according to one or more activated TCI states (e.g., of the set of TCI states associated with CORESET) and the UE115may apply the one or more activated TCI states to receive and decode the PDCCH or PDSCH transmissions. The base station105may indicate the one or more activated TCI states to the UE115to enable the UE115to receive and decode the PDCCH or PDSCH transmission.

FIG.2illustrates an example of a wireless communications system200that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. In some examples, wireless communications system200may implement aspects of wireless communications system100such as base station105-aand UE115-a, which may be examples of base stations105and UEs115as described with reference toFIG.1.

Base station105-amay communicate an RRC message205to UE115-a. The RRC message205(e.g., a configuration message) may configure one or more CORESETs. For example, the RRC message205may include an indication of the CORESET ID and a list of TCI state IDs for the CORESET. That is, each CORESET may be configured with up to 64 TCI states from a total number of 128 TCI states. The total number of TCI states may be defined in a PDSCH configuration and included in an information element (e.g., the BWP-DownlinkDedicated information element). The RRC message205may indicate (e.g., by TCI-StatesPDCCH-ToAddList and TCI-StatesPDCCH-ToReleaseList) between one and 64 possible TCI states associated with the CORESET. If the CORESET ID is equal to 0, the CORESET may not be configured by an information element ControlResourceSet. Hence, the RRC message205may not include a list of possible TCI states associated with CORESET 0. Instead, CORESET 0 may be configured (e.g., automatically, by default) with the first 64 TCI states of the total 128 possible TCI states.

The RRC message205may optionally include an indication of a mapping scheme to employ for the CORESET. That is, if more than one TCI state of the CORESET is activated (e.g., for a PDCCH transmission215), the resources for each of the activated TCI states may be mapped according to a mapping scheme. For example, the RRC message205may indicate that, if more than one TCI state of the CORESET is activated, the resources for the more than one TCI state may be mapped according to an FDM scheme, a TDM scheme, or a spatial division multiplexing (SDM) scheme. If the RRC message205includes the indication of the mapping scheme, the RRC message205may additionally include parameters for the mapping scheme.

Base station105-amay communicate MAC-CE210to UE115-a. The MAC-CE210may be a control message from the base station105-aconfigured to indicate one or more activated TCI states for the CORESET (e.g., the CORESET configured by the RRC message205). In some cases, the MAC-CE210may activate TCI states for a group of CCs or BWPs. The MAC-CE210may include a field identifying the CORESET (e.g., a CORESET ID field). The MAC-CE210may also include a field identifying at least one TCI state to be activated (e.g., for a subsequent PDCCH transmission215). In some cases, the CORESET containing the PDCCH transmission215may only be configured to include a single activated TCI state. Here, the MAC-CE210may indicate the one activated TCI state for the subsequent PDCCH transmission215. In some other cases (e.g., in the case of the wireless communications system200), the CORESET containing the PDCCH transmission215may be configured to include one or more activated TCI states (e.g., one activated TCI state, two activated TCI states). That is, the CORESET containing the PDCCH transmission215may be dynamically configurable to include either one or multiple activated TCI states. Here, the MAC-CE210may indicate which TCI states (e.g., of the TCI states associated with the CORESET) are activated for the PDCCH transmission215.

The MAC-CE210may optionally include an indication of a mapping scheme to employ for the CORESET if more than one TCI state is activated. That is, if the RRC message205does not include the indication of the mapping scheme, the MAC-CE210may include the indication of the mapping scheme. For example, the MAC-CE210may indicate that if more than one TCI state of the CORESET is activated (e.g., for a PDCCH transmission215), the resources for each of the activated TCI states may be mapped according to a mapping scheme (e.g., an FDM scheme, a TDM scheme, an SDM scheme). If the MAC-CE210includes the indication of the mapping scheme, the MAC-CE210may additionally include parameters for the mapping scheme.

Base station105-amay communicate a PDCCH transmission215to UE115-a. The base station105-amay communicate the PDCCH transmission215within the CORESET configured by the RRC message205. Additionally, the base station105-amay use the one or more activated TCI states indicated within the MAC-CE210to transmit the PDCCH transmission215. The UE115-amay receive the PDCCH transmission215and decode the PDCCH transmission215using the same one or more activated TCI states.

The PDCCH transmission215may include scheduling information for a subsequent PDSCH transmission220. For example, the PDCCH transmission215may include a scheduling offset indicating the PDSCH transmission220. Additionally, the PDCCH transmission215may include downlink control information (DCI) indicating one or more activated TCI states for the PDSCH transmission220. In some cases, the base station105-aand UE115-amay use the TCI states indicated within the DCI for the PDSCH transmission220. In some other cases, the base station105-aand UE115-amay determine which TCI states to use for the PDSCH transmission220by another method.

In one example, the PDCCH transmission215may fail to include a field indicating one or more activated TCI states for the PDSCH transmission220. Here, the UE115-aand base station105-amay determine the TCI states associated with the PDSCH transmission220from one or more of the activated TCI states associated with the PDCCH transmission215. That is, the UE115-aand base station105-amay use the one or more TCI states activated for the PDCCH transmission215to receive and transmit the PDSCH transmission220. If there are more than one TCI state activated for the PDCCH transmission215, one of the activated TCI states may be used for the PDSCH transmission220or all of the activated TCI states may be used for the PDSCH transmission220. If all of the activated TCI states are used for the PDSCH transmission220, the multiplexing techniques used for the PDCCH transmission215may be reused for the PDSCH transmission220. For example, if the base station105-atransmits the PDCCH transmission215using two activated TCI states mapped using a TDM scheme, the base station105-amay transmit the PDSCH transmission220using the same two activated TCI states and mapped using the same TDM scheme.

If only one of the activated TCI states is to be used for the PDSCH transmission220, the UE115-aand base station105-amay determine which of the more than one activated TCI states to use for the PDSCH transmission220. For example, the UE115-aand base station105-amay select the TCI state (e.g., from the activated TCI states for the CORESET that carries the PDCCH transmission215) associated with a lowest TCI state ID. That is, the UE115-aand base station105-amay compare the TCI state IDs of each of the activated TCI states of the CORESET that carries the PDCCH to determine which TCI state is associated with the lowest TCI state. In another example, the UE115-aand base station105-aselect the TCI state from the activated TCI states of the CORESET that carries the PDCCH transmission215based on an order of the fields within the MAC-CE210. That is, the UE115-aand base station105-amay select the TCI state that was indicated first within the MAC-CE210. Alternatively, the UE115-aand the base station105-amay select the TCI state that was indicated last within the MAC-CE210.

In another example, the UE115-aand base station105-amay determine which TCI states to use for the PDSCH transmission220(e.g., as opposed to using TCI states indicated within the PDCCH transmission215) because the indicated scheduling offset is less than a time duration for QCL (e.g., a timeDurationForQCL). Here, the UE115-aand base station105-amay determine the activated TCI states associated with the PDSCH transmission220based on a default QCL assumption for the PDSCH transmission220. The default QCL assumption may be a QCL relationship or TCI state of the CORESET associated with a monitored search space with a lowest CORESET ID in the latest slot in which one or more CORESETs within the active BWP of the base station105-aare monitored by the UE115-a. If there is more than one TCI state activated for the CORESET with the lowest CORESET ID associated with the latest slot, one of the activated TCI states may be used for the PDSCH transmission220or all of the activated TCI states may be used for the PDSCH transmission220. If all of the activated TCI states are used for the PDSCH transmission220, the multiplexing techniques used for the latest slot may be reused for the PDSCH transmission220. For example, if the base station105-atransmits a PDCCH transmission215using a CORESET with the lowest CORESET ID within the latest slot using two activated TCI states mapped by an SDM scheme, the base station105-amay transmit the PDSCH transmission220using the same two activated TCI states and mapped using the same SDM scheme.

If only one of the activated TCI states is to be used for the PDSCH transmission220, the UE115-aand base station105-amay determine which of the more than one activated TCI states to use for the PDSCH transmission220. For example, the UE115-aand base station105-amay select the TCI state (e.g., from the activated TCI states used for the CORESET) associated with a lowest TCI state ID. That is, the UE115-aand base station105-amay compare the TCI state IDs of each of the activated TCI states to determine which TCI state is associated with the lowest TCI state. In another example, the UE115-aand base station105-aselect the TCI state from the activated TCI states used for the CORESET based on an order of the fields within the MAC-CE210. That is, the UE115-aand base station105-amay select the TCI state that was indicated first within the MAC-CE210. Alternatively, the UE115-aand the base station105-amay select the TCI state that was indicated last within the MAC-CE210.

In another example, the UE115-amay determine to exclude all CORESETs associated with more than one activated TCI state. In such example, the default QCL assumption may be a QCL relationship or TCI state of the CORESET associated with a monitored search space with a lowest CORESET ID of a remaining set of CORESETs (e.g., CORESETs that were not excluded) in the latest slot in which one or more CORESETs within the active BWP of the base station105-aare monitored by the UE115-aThat is, the UE115-amay identify a CORESET with one activated TCI state and select the one activated TCI state to be used for the PDSCH transmission220,

Base station105-amay communicate a PDSCH transmission220to UE115-a. The base station105-amay transmit the PDSCH transmission220using one or more activated TCI states and the UE115-amay receive and decode the PDSCH transmission220using the same one or more activated TCI states.

FIG.3illustrates an example of configurations300of MAC-CEs210that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. In some examples, configurations300may implement aspects of wireless communications system100and200such as MAC-CEs210, which may be examples of the MAC-CE210as described with reference toFIG.2. Additionally, the MAC-CEs210may be transmitted from a base station105to a UE115as described with reference toFIGS.1and2to activate one or more TCI states. Each of the MAC-CEs210may be configured to indicate one or more activated TCI states (e.g., for a PDCCH transmission). That is, each of the MAC-CEs210may indicate a single activated TCI state or more than one activated TCI state. The configurations300may be utilized for all CORESETs. Alternatively, the configurations300may be utilized for a subset of CORESETs configured to use one or more TCI states. That is, CORESETs that are configured to use only a single TCI state may utilize a different configuration for MAC-CEs210activating the single TCI state.

FIG.3Aillustrates a configuration300-aof the MAC-CE210-a. The configuration300-amay correspond to a MAC-CE210-athat has a static size. That is, a quantity of bits included within the MAC-CE210-amay be independent of a quantity of activated TCI states. For example, the MAC-CE210-amay include 24 bits regardless of a quantity of activated TCI states.

The MAC-CE210-amay include a serving cell ID field310-a. In some cases, the serving cell ID field310-amay include five bits of data. The serving cell ID field310-amay indicate an ID of the CC (or, in some cases, group of CCs) for which the CORESET belongs to. The MAC-CE210-amay further include a CORESET ID field315-a. The CORESET ID field315-amay include four bits of data (e.g., three bits of data on the first line and one bit of data on the second line of the MAC-CE210-a). The MAC-CE210-amay include a first TCI state ID field320and a second TCI state ID field330. Each of the TCI state ID fields320and330may include seven bits. That is, the TCI state ID may identify the TCI state from 128 possible TCI states. The MAC-CE210-amay also include an indicator bit ‘C’325-a. The indicator bit ‘C’325-amay indicate whether the second TCI state ID field330includes a TCI state ID corresponding to an activated TCI state. For example, if the indicator bit ‘C’325-aincludes a logic value ‘0’, the second TCI state ID field330may not include an ID associated with an activated TCI state. That is, the MAC-CE210-amay only activate a single TCI state (e.g., indicated by the first TCI state ID field320). Additionally, if the indicator bit ‘C’325-aincludes a logic value ‘1’, the second TCI state ID field330may include an ID associate with an activated TCI state. That is, the MAC-CE210-amay activate two TCI states (e.g., indicated by the first TCI state ID field320and the second TCI state ID field330).

FIG.3Billustrates a configuration300-bof the MAC-CE210-b. The configuration300-bmay correspond to a MAC-CE210-bthat has a dynamic size. That is, a quantity of bits included within the MAC-CE210-bmay be dependent of a quantity of activated TCI states. That is, the MAC-CE210-bmay change in size based on a quantity of activated TCI states. For example, the MAC-CE210-bmay include 24 bits if two TCI states are activated. Additionally, the MAC-CE210-bmay include 16 bits if one TCI state is activated.

The MAC-CE210-bmay include a serving cell ID field310-b. In some cases, the serving cell ID field310-bmay include five bits of data. The serving cell ID field310-bmay indicate an ID of the CC (or, in some cases, group of CCs) for which the CORESET belongs to. The MAC-CE210-bmay further include a CORESET ID field315-b. The CORESET ID field315-bmay include four bits of data (e.g., three bits of data on the first line and one bit of data on the second line of the MAC-CE210-a). The MAC-CE210-bmay also include a first TCI state index field335and an optional second TCI state index field345. Each TCI state index field335and345may include six bits. Thus, the TCI state index fields335and345may index the TCI states from the TCI states defined in association with the CORESET (e.g., by an RRC message or configuration message). If 64 or less TCI states are defined in association with the CORESET, the six bit TCI state index fields335and345may identify an index associated with one of the defined TCI states. The indicator bit ‘C’325-bmay indicate a quantity of activated TCI states. For example, if the indicator bit ‘C’325-bincludes a logic value ‘0’, there may only be a single activated TCI state for the CORESET indicated by the CORESET ID field315-b. Here, the reserved bits ‘R’340and the second TCI state index field345may not be included within the MAC-CE210-b. Additionally, if the indicator bit ‘C’325-bincludes a logic value ‘1’, there may be two activated TCI states. Here, the reserved bits ‘R’340-aand340-bmay be logic value ‘0s’ and the second TCI state index field345may indicate which TCI state (e.g., from the list of TCI states defined for the CORESET) is activated.

FIG.4illustrates an example of a process flow400that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. In some examples, the process flow400may implement aspects ofFIGS.1through3. For example, the process flow400may include signaling between a UE115-band a base station105-b, which may be examples of UEs115and base stations105as described with reference toFIGS.1and2. Additionally, some of the signaling may implement a configuration as described with reference toFIG.3.

At405, the base station105-bmay transmit a configuration message to the UE115-b. The configuration message may be an example of an RRC message as described with reference toFIGS.1and2. The configuration message405may indicate that a CORESET for a downlink control channel (e.g., a PDCCH) is associated with a set of TCI states. For example, the configuration message405may define up to 64 TCI states for the CORESET.

At410, the base station105-bmay transmit a control message to the UE115-b. The control message may be an example of a MAC-CE as described with reference toFIGS.1through3. For example, the control message may be configured according to one of the configurations as described with reference toFIG.3A or3B. The control message may activate one or more TCI states for the CORESET.

At415, the UE115-bmay identify the activated TCI states415. In a first example, the UE115-bmay determine that a single TCI state is activate for the CORESET. That is, the control message may include an indication (e.g., an indicator bit ‘C’) that a single TCI state is activated. In another example, the UE115-bmay determine that two TCI states are activated for the CORESET. That is, the control message may include an indication (e.g., an indicator bit ‘C’) that two TCI states are activated.

The UE115-bmay identify which TCI states are activated based on the control message. That is, the control message may include a TCI state ID within the control message. Additionally, the control message may include a TCI state index within the control message (e.g., relating to the set of TCI states associated with the CORESET).

At420, the UE115-bmay optionally determine a mapping scheme for the activated TCI states. That is, if the UE115-bidentifies more than one activated TCI state (e.g., at415), the UE115-bmay determine a mapping scheme for the more than one activated TCI state at420. That is, the UE115-bmay determine that the TCI states may be mapped by TDM, FDM, or SDM. In some cases, the configuration message405may indicate one or more of the mapping schemes for the CORESET as well as parameters for the mapping scheme. The control message may indicate one of the mapping schemes for the CORESET. Thus, the UE115-bmay determine the mapping scheme.

At425, the base station105-bmay transmit a PDCCH transmission (e.g., a downlink control channel transmission) to the UE115-baccording to the configuration message and control message. That is, the base station105-bmay transmit the PDCCH transmission using the one or more activated TCI states indicated by the control message.

At430, the UE115-bmay decode the PDCCH transmission based on the configuration message and the one or more activated TCI states (e.g., using the one or more activated TCI states indicated by the control message).

FIG.5illustrates an example of a process flow500that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. In some examples, the process flow500may implement aspects ofFIGS.1through3. For example, the process flow500may include signaling between a UE115-cand a base station105-c, which may be examples of UEs115and base stations105as described with reference toFIGS.1and2. Additionally, some of the signaling may implement a configuration as described with reference toFIG.3.

At505, the base station105-cmay transmit a configuration message to the UE115-c. The configuration message may be an example of an RRC message as described with reference toFIGS.1and2. The configuration message505may indicate that a CORESET for a downlink control channel (e.g., a PDCCH) is associated with a set of TCI states. For example, the configuration message505may define up to 64 TCI states for the CORESET.

At510, the base station105-cmay transmit a control message to the UE115-c. The control message may be an example of a MAC-CE as described with reference toFIGS.1through3. For example, the control message may be configured according to one of the configurations as described with reference toFIG.3A or3B. The control message may activate one or more TCI states for the CORESET.

At515, the base station105-cmay transmit a PDCCH transmission to the UE115-cin accordance with the configuration message and control message (e.g., using the one or more activated TCI states indicated by the control message510). The PDCCH transmission may schedule a PDSCH transmission and include scheduling information for the PDSCH transmission. For example, the PDCCH transmission may include a scheduling offset for the PDSCH transmission.

At520, the UE115-cmay identify at least one TCI state to apply to a reception of the PDSCH transmission. In a first example, the UE115-cmay identify the at least one TCI state based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission. Here, the scheduling offset for the PDSCH transmission may be greater than a threshold scheduling offset (e.g., a time duration for QCL). In this first example, the UE115-cmay determine to apply a TCI state to the reception of the PDSCH transmission from one or more TCI states activated for the CORESET that carries PDCCH transmission (e.g., for the reception of the PDCCH transmission).

In a second example, the UE115-cmay identify the at least one TCI state based on the scheduling offset for the PDSCH transmission being less than the threshold scheduling offset. Here, the UE115-cmay identify one or more CORESETs associated with a transmission received prior to520. The UE115-cmay then determine a CORESET associated with a lowest value of a CORESET ID from each of the CORESET IDs of the one or more CORESETs. The UE115-cmay determine to apply one or more of the TCI states associated with the CORESET (e.g., associated with lowest value of the CORESET ID) to the reception of the PDSCH.

In either example, the UE115-cmay, in some cases, determine to apply all (e.g., both) of the one or more TCI states (e.g., two TCI states) to the reception of the PDSCH. In another case, the UE115-cmay determine to apply one of the two TCI states to the reception of the PDSCH. Here, the UE115-cmay identify one of the one or more activated TCI states based on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within the control message each indicating one of the two activated TCI states.

In some examples, the UE115-cmay determine a subset of the one or more CORESET that excludes CORESETS associated with more than one active TCI state. In such example, UE115-cmay determine a CORESET associated with the lowest CORESET ID from each of the CORESETs of the subset of CORESETS and apply the one TCI state associated with the determined CORESET to the reception of the PDSCH.

At525, the base station105-cmay transmit, to the UE115-c, the PDSCH transmission using the identified TCI states.

At530, the UE115-cmay decode the PDSCH transmission by applying the identified TCI states to the reception of the PDSCH transmission.

FIG.6shows a block diagram600of a device605that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The device605may be an example of aspects of a UE115as described herein. The device605may include a receiver610, a UE coding manager615, and a transmitter620. The device605may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The UE coding manager615may identify that a CORESET for a downlink control channel is associated with a set of TCI states, receive, from a base station, a control message activating one or more TCI states for the CORESET, and decode the downlink control channel based on the one or more activated TCI states.

Additionally, the UE coding manager615may receive, from a base station, a configuration message indicating that a CORESET is associated with a set of activated TCI states, receive a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decode the PDSCH transmission in accordance with the at least one TCI state.

Additionally, the UE coding manager615may receive, from a base station, a configuration message indicating that a CORESET is associated with a set of activated TCI states, receive a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decode the PDSCH transmission in accordance with the at least one TCI state.

The actions performed by the coding manager615as described herein may be implemented to realize one or more potential advantages. For example, allowing the device605(e.g., a UE115) to utilize one or more TCI states as opposed to only one TCI state may potentially increase the diversity of transmissions as well as increase reliability of the transmissions. Increasing reliability my in turn decrease processing at the device605. That is, less processing power may be expended by the device605due to a decrease in retransmission operations.

FIG.7shows a block diagram700of a device705that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The device705may be an example of aspects of a device605, or a UE115as described herein. The device705may include a receiver710, a UE coding manager715, and a transmitter745. The device705may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The UE coding manager715may be an example of aspects of the UE coding manager615as described herein. The UE coding manager715may include a configuration message manager720, a control message manager725, a PDCCH receiver730, a PDSCH TCI state manager735, and a PDSCH receiver740. The UE coding manager715may be an example of aspects of the UE coding manager910described herein.

The configuration message manager720may identify that a CORESET for a downlink control channel is associated with a set of TCI states. Additionally, the configuration message manager720may receive, from a base station, a configuration message indicating that a CORESET is associated with a set of activated TCI states.

The control message manager725may receive, from a base station, a control message activating one or more TCI states for the CORESET.

The PDCCH receiver730may decode the downlink control channel based on the one or more activated TCI states. Additionally, the PDCCH receiver730may receive a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission. In some cases, the PDCCH receiver730may receive a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission

The PDSCH TCI state manager735may identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission. Additionally, the PDSCH TCI state manager735may identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission.

The PDSCH receiver740may decode the PDSCH transmission in accordance with the at least one TCI state.

The transmitter745may transmit signals generated by other components of the device705. In some examples, the transmitter745may be collocated with a receiver710in a transceiver module. For example, the transmitter745may be an example of aspects of the transceiver920described with reference toFIG.9. The transmitter745may utilize a single antenna or a set of antennas.

FIG.8shows a block diagram800of a UE coding manager805that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The UE coding manager805may be an example of aspects of a UE coding manager615, a UE coding manager715, or a UE coding manager910described herein. The UE coding manager805may include a configuration message manager810, a control message manager815, a PDCCH receiver820, a single activated TCI state manager825, a multiple activated TCI state manager830, a PDSCH TCI state manager835, and a PDSCH receiver840. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The configuration message manager810may identify that a CORESET for a downlink control channel is associated with a set of TCI states. In some examples, the configuration message manager810may receive, from the base station, a configuration message indicating that the CORESET for the downlink control channel is associated with the set of TCI states. In some cases, the configuration message may further indicate that the set of TCI states are mapped using either an FDM mapping, a TDM mapping, or a space division multiplexing mapping. In some instances, the configuration message further indicates parameters for mapping the set of TCI states using at least two of an FDM mapping scheme, a TDM mapping scheme, and a space division multiplexing mapping scheme. In some cases, the configuration message is an RRC message. Additionally, the configuration message manager810may receive, from a base station, a configuration message indicating that a CORESET is associated with a set of activated TCI states.

The control message manager815may receive, from a base station, a control message activating one or more TCI states for the CORESET. In some examples, receiving the control message may include receiving an indication of the one or more activated TCI states. The indication may include one or more TCI state IDs. Additionally or alternatively, the indication may include one or more indices associated with the one or more activated TCI states. In some cases, the control message includes a first field configured to indicate a first TCI state, a second field configured to indicate a second TCI state, and a third field configured to indicate whether the TCI state of the first TCI state or the first TCI state and the second TCI state are activated. In some cases, the third field is configured to indicate whether the control message includes the second field. In some instances, the control message includes a dynamic number of fields based on a quantity of activated TCI states. In some cases, the control message indicates one of the FDM mapping scheme, the TDM mapping scheme, or the space division multiplexing mapping scheme for mapping of the one or more activated TCI states. In some examples, the control message includes an indication of a group of CCs to which the control message pertains. In some instances, the control message is a MAC-CE. In some cases, the control message manager815may receive, from the base station, a control message activating two TCI states for the CORESET, where the at least one TCI state to apply to the reception of the PDSCH transmission includes at least one of the two activated TCI states.

The PDCCH receiver820may receive a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission.

Alternatively or additionally, the PDCCH receiver820may receive a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission. In some examples, the PDCCH receiver820may decode the downlink control channel based on the one or more activated TCI states. In some instances, the PDCCH receiver820may decode the physical downlink control transmission based at least in part on the configuration message and at least one of the two activated TCI states.

The single activated TCI state manager825may determine, based on an indication within the control message, that a single TCI state is activated for the CORESET. In some examples, identifying a first TCI state that is activated based on the indication, where the one or more activated TCI states includes the first TCI state.

The multiple activated TCI state manager830may determine, based on an indication within the control message, that two TCI states are activated for the CORESET. In some examples, the multiple activated TCI state manager830may identify a first TCI state that is activated based on the indication. In some cases, identifying a second TCI state that is activated based on the indication, where the one or more activated TCI states includes the first TCI state and the second TCI state.

The PDSCH TCI state manager835may identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission. Additionally or alternatively, the PDSCH TCI state manager835may identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission. In some cases, the identifying is based on a scheduling offset for the PDSCH transmission that is larger than a threshold scheduling offset. In some cases, the threshold scheduling offset is a time duration for QCL.

In some examples, the PDSCH TCI state manager835may identify one or more CORESETs associated with a transmission received prior to identifying the CORESET. In some instances, the PDSCH TCI state manager835may identify the CORESET associated with two activated TCI states, where the at least one TCI state to apply to the reception of the PDSCH transmission includes at least one of the two activated TCI states. In some cases, the PDSCH TCI state manager835may determine that a CORESET ID with a lowest value from each CORESET ID of the one or more CORESETs is the CORESET ID identifying the CORESET. Additionally, PDSCH TCI state manager835may identify one or more CORESETs associated with a transmission received prior to decoding the PDSCH transmission. In some cases, the PDSCH TCI state manager835may determine a subset of the one or more CORESETs that excludes CORESETs of the one or more CORESETs that are associated with a set of activated TCI states. In some instances, the PDSCH TCI state manager835may identify a CORESET from the subset of the one or more CORESETs having a CORESET ID with a value less than each CORESET of other CORESETs from the subset of the one or more CORESETs, where the at least one TCI state to apply to the reception of the PDSCH transmission comprises a TCI state associated with the identified CORESET having the CORESET ID with the value less than each CORESET ID of other CORESETs

In some examples, the PDSCH TCI state manager835may determine to apply one of the two activated TCI states to the reception of the PDSCH transmission. For example, the PDSCH TCI state manager835may determine to apply one of the two activated TCI states to the reception of the PDSCH transmission based on the scheduling information for the PDSCH transmission. In some cases, the PDSCH TCI state manager835may identify one of the two activated TCI states to apply to the reception of the PDSCH transmission based on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within the control message each indicating one of the two activated TCI states.

In some instances, the PDSCH TCI state manager835may determine (e.g., based on the scheduling information for the PDSCH transmission) to apply both of the two activated TCI states to the reception of the PDSCH transmission.

The PDSCH receiver840may decode the PDSCH transmission in accordance with the at least one TCI state.

FIG.9shows a diagram of a system900including a device905that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The device905may be an example of or include the components of device605, device705, or a UE115as described herein. The device905may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a UE coding manager910, an I/O controller915, a transceiver920, an antenna925, memory930, and a processor940. These components may be in electronic communication via one or more buses (e.g., bus945).

The UE coding manager910may identify that a CORESET for a downlink control channel is associated with a set of TCI states, receive, from a base station, a control message activating one or more TCI states for the CORESET, and decode the downlink control channel based on the one or more activated TCI states.

Additionally, the UE coding manager910may receive, from a base station, a configuration message indicating that a CORESET is associated with a set of activated TCI states, receive a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decode the PDSCH transmission in accordance with the at least one TCI state.

Additionally, the UE coding manager910may receive, from a base station, a configuration message indicating that a CORESET is associated with a set of activated TCI states, receive a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission, and decode the PDSCH transmission in accordance with the at least one TCI state.

The receiver1010may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to signaling for configuring downlink transmissions). Information may be passed on to other components of the device1005. The receiver1010may be an example of aspects of the transceiver1320described with reference toFIG.13.

The receiver1010may utilize a single antenna or a set of antennas.

The communications manager1015may identify a configuration indicating that a CORESET for a downlink control channel is associated with a set of TCI states, transmit, to a UE, a configuration message indicating the identified configuration, and transmit, to the UE, a control message activating one or more TCI states for the CORESET.

Additionally, the communications manager1015may transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of activated TCI states, transmit, to the UE, a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmit the PDSCH transmission in accordance with the at least one TCI state.

Additionally, the communications manager1015may also transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of activated TCI states, transmit, to the UE, a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmit the PDSCH transmission in accordance with the at least one TCI state.

The communications manager1115may be an example of aspects of the communications manager1015as described herein. The communications manager1115may include a configuration identifier1120, a configuration message transmitter1125, a control message transmitter1130, a downlink control message transmitter1135, a PDSCH TCI state component1140, and a PDSCH transmitter1145. The communications manager1115may be an example of aspects of the communications manager1310described herein.

The configuration identifier1120may identify a configuration indicating that a CORESET for a downlink control channel is associated with a set of TCI states.

The configuration message transmitter1125may transmit, to a UE, a configuration message indicating the identified configuration. Additionally, the configuration message transmitter1125may transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of activated TCI states.

The control message transmitter1130may transmit, to the UE, a control message activating one or more TCI states for the CORESET.

The downlink control message transmitter1135may transmit, to the UE, a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission. In some cases, the downlink control message transmitter1135may transmit, to the UE, a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission

The PDSCH TCI state component1140may identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission. Additionally, the PDSCH TCI state component1140may identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission.

The PDSCH transmitter1145may transmit the PDSCH transmission in accordance with the at least one TCI state.

The transmitter1150may transmit signals generated by other components of the device1105. In some examples, the transmitter1150may be collocated with a receiver1110in a transceiver module. For example, the transmitter1150may be an example of aspects of the transceiver1320described with reference toFIG.13. The transmitter1150may utilize a single antenna or a set of antennas.

FIG.12shows a block diagram1200of a communications manager1205that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The communications manager1205may be an example of aspects of a communications manager1015, a communications manager1115, or a communications manager1310described herein. The communications manager1205may include a configuration identifier1210, a configuration message transmitter1215, a control message transmitter1220, a downlink control message transmitter1225, a PDSCH TCI state component1230, and a PDSCH transmitter1235. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The configuration identifier1210may identify a configuration indicating that a CORESET for a downlink control channel is associated with a set of TCI states.

The configuration message transmitter1215may transmit, to a UE, a configuration message indicating the identified configuration. In some examples, the configuration message transmitter1215may transmit, to a UE, a configuration message indicating that a CORESET for a downlink control channel is associated with a set of activated TCI states. In some cases, transmitting the configuration message may include transmitting an indication of the one or more activated TCI states. The indication may include a TCI state ID. Additionally, the indication may include one or more indices associated with the one or more activated TCI states. In some cases, the configuration message further indicates that the set of TCI states are mapped using either an FDM mapping, a TDM mapping, or a space division multiplexing mapping. In some instances, the configuration message further indicates parameters for mapping the set of TCI states using at least two of an FDM mapping scheme, a TDM mapping scheme, and a space division multiplexing mapping scheme. In some examples, the configuration message is an RRC message.

The control message transmitter1220may transmit, to the UE, a control message activating one or more TCI states for the CORESET. In some examples, the control message transmitter1220may transmit, to the UE, a control message activating two TCI states for the CORESET, where the at least one TCI state to apply to the reception of the PDSCH transmission includes at least one of the two activated TCI states. In some cases, the control message includes a first field configured to indicate a first TCI state, a second field configured to indicate a second TCI state, and a third field configured to indicate which TCI state of the first TCI state, the second TCI state, or both TCI states are activated. In some examples, the control message includes a dynamic number of fields based on a quantity of activated TCI states. In some instances, the control message indicates one of the FDM mapping scheme, the TDM mapping scheme, or the space division multiplexing mapping scheme for mapping of the one or more activated TCI states. In some cases, the control message is a MAC-CE.

In some cases, the control message includes an indication that a single TCI state is activated for the CORESET. In some examples, the indication indicates a first TCI state that is activated. In some instances, the one or more activated TCI states include the first TCI state. In some cases, the control message includes an indication that two TCI states are activated for the CORESET. In some examples, the indication indicates that a first TCI state and a second TCI state are activated. In some instances, the one or more activated TCI states include the first TCI state and the second TCI state. In some cases, the control message includes an indication of a group of CCs to which the control message pertains.

The downlink control message transmitter1225may transmit, to the UE, a downlink control message via the downlink control channel according to the one or more activated TCI states for the CORESET. In some cases, the downlink control message transmitter1225may transmit the physical downlink control transmission based on the configuration message and at least one of the two activated TCI states. In some examples, the downlink control message transmitter1225may transmit, to the UE, a physical downlink control transmission over the downlink control channel in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission. In some cases, the scheduling information for the PDSCH transmission defines a scheduling offset for the PDSCH transmission that is larger than a threshold scheduling offset. In some instances, the threshold scheduling offset is a time duration for QCL.

The PDSCH TCI state component1230may identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission. Additionally, the PDSCH TCI state component1230may identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission. In some cases, the threshold scheduling offset is a time duration for QCL. In some examples, the PDSCH TCI state component1230may identify the one of the two activated TCI states to apply to the reception of the PDSCH transmission based on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within the control message each indicating one of the two activated TCI states.

In some examples, the PDSCH TCI state component1230may identify one or more CORESETs associated with a transmission transmitted prior to identifying the CORESET. In some cases, identifying the CORESET associated with two activated TCI states, where the at least one TCI state to apply to the reception of the PDSCH transmission includes at least one of the two activated TCI states. In some instances, the PDSCH TCI state component1230may determine that a CORESET ID with a lowest value from each CORESET ID of the one or more CORESETs is the CORESET ID identifying the CORESET.

The PDSCH transmitter1235may transmit the PDSCH transmission in accordance with the at least one TCI state. In some examples, the PDSCH transmitter1235may transmit the PDSCH transmission in accordance with one of the two activated TCI states. In some cases, the PDSCH transmitter1235may transmit the PDSCH transmission in accordance with both of the two activated TCI states.

FIG.13shows a diagram of a system1300including a device1305that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The device1305may be an example of or include the components of device1005, device1105, or a base station105as described herein. The device1305may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager1310, a network communications manager1315, a transceiver1320, an antenna1325, memory1330, a processor1340, and an inter-station communications manager1345. These components may be in electronic communication via one or more buses (e.g., bus1350).

The communications manager1310may identify a configuration indicating that a CORESET for a downlink control channel is associated with a set of TCI states, transmit, to a UE, a configuration message indicating the identified configuration, and transmit, to the UE, a control message activating one or more TCI states for the CORESET.

Additionally, the communications manager1310may transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of activated TCI states, transmit, to the UE, a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmit the PDSCH transmission in accordance with the at least one TCI state.

Additionally, the communications manager1310may also transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of activated TCI states, transmit, to the UE, a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission, identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission, and transmit the PDSCH transmission in accordance with the at least one TCI state.

The memory1330may include RAM, ROM, or a combination thereof. The memory1330may store computer-readable code1335including instructions that, when executed by a processor (e.g., the processor1340) cause the device to perform various functions described herein. In some cases, the memory1330may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.

FIG.14shows a flowchart illustrating a method1400that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The operations of method1400may be implemented by a UE115or its components as described herein. For example, the operations of method1400may be performed by a UE coding manager as described with reference toFIGS.6through9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At1405, the UE may identify that a CORESET for a downlink control channel is associated with a set of TCI states. The operations of1405may be performed according to the methods described herein. In some examples, aspects of the operations of1405may be performed by a configuration message manager as described with reference toFIGS.6through9.

At1410, the UE may receive, from a base station, a control message activating one or more TCI states for the CORESET. The operations of1410may be performed according to the methods described herein. In some examples, aspects of the operations of1410may be performed by a control message manager as described with reference toFIGS.6through9.

At1415, the UE may decode the downlink control channel based on the one or more activated TCI states. The operations of1415may be performed according to the methods described herein. In some examples, aspects of the operations of1415may be performed by a PDCCH receiver as described with reference toFIGS.6through9.

FIG.15shows a flowchart illustrating a method1500that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The operations of method1500may be implemented by a UE115or its components as described herein. For example, the operations of method1500may be performed by a UE coding manager as described with reference toFIGS.6through9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At1505, the UE may identify that a CORESET for a downlink control channel is associated with a set of TCI states. The operations of1505may be performed according to the methods described herein. In some examples, aspects of the operations of1505may be performed by a configuration message manager as described with reference toFIGS.6through9.

At1510, the UE may receive, from a base station, a control message activating one or more TCI states for the CORESET. The operations of1510may be performed according to the methods described herein. In some examples, aspects of the operations of1510may be performed by a control message manager as described with reference toFIGS.6through9.

At1515, the UE may determine, based on an indication within the control message, that a single TCI state is activated for the CORESET. The operations of1515may be performed according to the methods described herein. In some examples, aspects of the operations of1515may be performed by a single activated TCI state manager as described with reference toFIGS.6through9.

At1520, the UE may identify a first TCI state that is activated based on the indication, where the one or more activated TCI states includes the first TCI state. The operations of1520may be performed according to the methods described herein. In some examples, aspects of the operations of1520may be performed by a single activated TCI state manager as described with reference toFIGS.6through9.

At1525, the UE may decode the downlink control channel based on the one or more activated TCI states. The operations of1525may be performed according to the methods described herein. In some examples, aspects of the operations of1525may be performed by a PDCCH receiver as described with reference toFIGS.6through9.

FIG.16shows a flowchart illustrating a method1600that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The operations of method1600may be implemented by a UE115or its components as described herein. For example, the operations of method1600may be performed by a UE coding manager as described with reference toFIGS.6through9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At1605, the UE may identify that a CORESET for a downlink control channel is associated with a set of TCI states. The operations of1605may be performed according to the methods described herein. In some examples, aspects of the operations of1605may be performed by a configuration message manager as described with reference toFIGS.6through9.

At1610, the UE may receive, from a base station, a control message activating one or more TCI states for the CORESET. The operations of1610may be performed according to the methods described herein. In some examples, aspects of the operations of1610may be performed by a control message manager as described with reference toFIGS.6through9.

At1615, the UE may determine, based on an indication within the control message, that two TCI states are activated for the CORESET. The operations of1615may be performed according to the methods described herein. In some examples, aspects of the operations of1615may be performed by a multiple activated TCI state manager as described with reference toFIGS.6through9.

At1620, the UE may identify a first TCI state that is activated based on the indication. The operations of1620may be performed according to the methods described herein. In some examples, aspects of the operations of1620may be performed by a multiple activated TCI state manager as described with reference toFIGS.6through9.

At1625, the UE may identify a second TCI state that is activated based on the indication, where the one or more activated TCI states includes the first TCI state and the second TCI state. The operations of1625may be performed according to the methods described herein. In some examples, aspects of the operations of1625may be performed by a multiple activated TCI state manager as described with reference toFIGS.6through9.

At1630, the UE may decode the downlink control channel based on the one or more activated TCI states. The operations of1630may be performed according to the methods described herein. In some examples, aspects of the operations of1630may be performed by a PDCCH receiver as described with reference toFIGS.6through9.

At1705, the base station may identify a configuration indicating that a CORESET for a downlink control channel is associated with a set of TCI states. The operations of1705may be performed according to the methods described herein. In some examples, aspects of the operations of1705may be performed by a configuration identifier as described with reference toFIGS.10through13.

At1710, the base station may transmit, to a UE, a configuration message indicating the identified configuration. The operations of1710may be performed according to the methods described herein. In some examples, aspects of the operations of1710may be performed by a configuration message transmitter as described with reference toFIGS.10through13.

At1715, the base station may transmit, to the UE, a control message activating one or more TCI states for the CORESET. The operations of1715may be performed according to the methods described herein. In some examples, aspects of the operations of1715may be performed by a control message transmitter as described with reference toFIGS.10through13.

FIG.18shows a flowchart illustrating a method1800that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The operations of method1800may be implemented by a UE115or its components as described herein. For example, the operations of method1800may be performed by a UE coding manager as described with reference toFIGS.6through9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At1805, the UE may receive, from a base station, a configuration message indicating that a CORESET is associated with a set of activated TCI states. The operations of1805may be performed according to the methods described herein. In some examples, aspects of the operations of1805may be performed by a configuration message manager as described with reference toFIGS.6through9.

At1810, the UE may receive a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission. The operations of1810may be performed according to the methods described herein. In some examples, aspects of the operations of1810may be performed by a PDCCH receiver as described with reference toFIGS.6through9.

At1815, the UE may identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission. The operations of1815may be performed according to the methods described herein. In some examples, aspects of the operations of1815may be performed by a PDSCH TCI state manager as described with reference toFIGS.6through9.

At1820, the UE may decode the PDSCH transmission in accordance with the at least one TCI state. The operations of1820may be performed according to the methods described herein. In some examples, aspects of the operations of1820may be performed by a PDSCH receiver as described with reference toFIGS.6through9.

FIG.19shows a flowchart illustrating a method1900that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The operations of method1900may be implemented by a UE115or its components as described herein. For example, the operations of method1900may be performed by a UE coding manager as described with reference toFIGS.6through9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At1905, the UE may receive, from a base station, a configuration message indicating that a CORESET is associated with a set of TCI states. The operations of1905may be performed according to the methods described herein. In some examples, aspects of the operations of1905may be performed by a configuration message manager as described with reference toFIGS.6through9.

At1910, the UE may receive, from the base station, a control message activating two TCI states for the CORESET, where the at least one TCI state to apply to the reception of the PDSCH transmission includes at least one of the two activated TCI states. The operations of1910may be performed according to the methods described herein. In some examples, aspects of the operations of1910may be performed by a control message manager as described with reference toFIGS.6through9.

At1915, the UE may receive a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission. The operations of1915may be performed according to the methods described herein. In some examples, aspects of the operations of1915may be performed by a PDCCH receiver as described with reference toFIGS.6through9.

At1920, the UE may identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission. The operations of1920may be performed according to the methods described herein. In some examples, aspects of the operations of1920may be performed by a PDSCH

TCI state manager as described with reference toFIGS.6through9.

At1925, the UE may decode the PDSCH transmission in accordance with the at least one TCI state. The operations of1925may be performed according to the methods described herein. In some examples, aspects of the operations of1925may be performed by a PDSCH receiver as described with reference toFIGS.6through9.

FIG.20shows a flowchart illustrating a method2000that supports signaling for configuring downlink transmissions in accordance with aspects of the present disclosure. The operations of method2000may be implemented by a UE115or its components as described herein. For example, the operations of method2000may be performed by a UE coding manager as described with reference toFIGS.6through9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At2005, the UE may receive, from a base station, a configuration message indicating that a CORESET is associated with a set of activated TCI states. The operations of2005may be performed according to the methods described herein. In some examples, aspects of the operations of2005may be performed by a configuration message manager as described with reference toFIGS.6through9.

At2010, the UE may receive a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission. The operations of2010may be performed according to the methods described herein. In some examples, aspects of the operations of2010may be performed by a PDCCH receiver as described with reference toFIGS.6through9.

At2015, the UE may identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a reception of the PDSCH transmission. The operations of2015may be performed according to the methods described herein. In some examples, aspects of the operations of2015may be performed by a PDSCH TCI state manager as described with reference toFIGS.6through9.

At2020, the UE may decode the PDSCH transmission in accordance with the at least one TCI state. The operations of2020may be performed according to the methods described herein. In some examples, aspects of the operations of2020may be performed by a PDSCH receiver as described with reference toFIGS.6through9.

At2105, the base station may transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of activated TCI states. The operations of2105may be performed according to the methods described herein. In some examples, aspects of the operations of2105may be performed by a configuration message transmitter as described with reference toFIGS.10through13.

At2110, the base station may transmit, to the UE, a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission including scheduling information for a PDSCH transmission. The operations of2110may be performed according to the methods described herein. In some examples, aspects of the operations of2110may be performed by a downlink control message transmitter as described with reference toFIGS.10through13.

At2115, the base station may identify, based on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission. The operations of2115may be performed according to the methods described herein. In some examples, aspects of the operations of2115may be performed by a PDSCH TCI state component as described with reference toFIGS.10through13.

At2120, the base station may transmit the PDSCH transmission in accordance with the at least one TCI state. The operations of2120may be performed according to the methods described herein. In some examples, aspects of the operations of2120may be performed by a PDSCH transmitter as described with reference toFIGS.10through13.

At2205, the base station may transmit, to a UE, a configuration message indicating that a CORESET is associated with a set of activated TCI states. The operations of2205may be performed according to the methods described herein. In some examples, aspects of the operations of2205may be performed by a configuration message transmitter as described with reference toFIGS.10through13.

At2210, the base station may transmit, to the UE, a physical downlink control transmission, the physical downlink control transmission including scheduling information for a PDSCH transmission. The operations of2210may be performed according to the methods described herein. In some examples, aspects of the operations of2210may be performed by a downlink control message transmitter as described with reference toFIGS.10through13.

At2215, the base station may identify, based on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the set of activated TCI states to apply to a transmission of the PDSCH transmission. The operations of2215may be performed according to the methods described herein. In some examples, aspects of the operations of2215may be performed by a PDSCH TCI state component as described with reference toFIGS.10through13.

At2220, the base station may transmit the PDSCH transmission in accordance with the at least one TCI state. The operations of2220may be performed according to the methods described herein. In some examples, aspects of the operations of2220may be performed by a PDSCH transmitter as described with reference toFIGS.10through13.

Various aspects of the described techniques are provided. Aspect 1: A method for wireless communication by a UE, comprising: identify that a CORESET for a downlink control channel is associated with a plurality of TCI states; receiving, from a base station, a control message activating one or more TCI states of the plurality of TCI states for the CORESET; and decoding the downlink control channel based at least in part on the one or more activated TCI states.

Aspect 2: The method of aspect 1, further comprising: receiving, from the base station, a configuration message indicating that the control resource set for the downlink control channel is associated with the plurality of TCI states.

Aspect 3: The method of aspect 1, further comprising: determining, based at least in part on an indication within the control message, that a single TCI state is activated for the CORESET; and identifying a first TCI state that is activated based at least in part on the indication, wherein the one or more activated TCI states comprises the first TCI state.

Aspect 4: The method of aspect 3, further comprising: determining, based at least in part on an indication within the control message, that two TCI states are activated for the CORESET; identifying a first TCI state that is activated based at least in part on the indication; and identifying a second TCI state that is activated based at least in part on the indication, wherein the one or more activated TCI states comprises the first TCI state and the second TCI state.

Aspect 5: The method of any of aspects 1 through 4, wherein receiving the control message comprises: receiving an indication of the one or more activated TCI states, wherein the indication comprises one or more TCI state IDs.

Aspect 6: The method of any of aspects 1 through 5, wherein receiving the control message comprises: receiving an indication of the one or more activated TCI states, wherein the indication comprises one or more indices associated with the one or more activated TCI states.

Aspect 7: The method of any of aspects 1 through 6, wherein the control message comprises a first field configured to indicate a first TCI state, a second field configured to indicate a second TCI state, and a third field configured to indicate which TCI state of the first TCI state, the second TCI state, or both TCI states are activated.

Aspect 8: The method of any of aspects 1 through 7, wherein the third field is configured to indicate whether the control message comprises the second field.

Aspect 9: The method of any of aspects 1 through 7, wherein the control message comprises a dynamic number of fields based at least in part on a quantity of activated TCI states.

Aspect 10: The method of any of aspects 1 through 9, wherein the configuration message further indicates that the plurality of TCI states are mapped using either a FDM mapping, a TDM mapping, or a space division multiplexing mapping.

Aspect 11: The method of any of aspects 1 through 10, wherein the configuration message further indicates parameters for mapping the plurality of TCI states using at least two of a FDM mapping scheme, a TDM mapping scheme, and a space division multiplexing mapping scheme; and the control message indicates one of the FDM mapping scheme, the TDM mapping scheme, or the space division multiplexing mapping scheme for mapping of the one or more activated TCI states.

Aspect 12: The method of any of aspects 1 through 11, wherein the control message comprises an indication of a group of CCs to which the control message pertains.

Aspect 13: The method of any of aspects 1 through 12, wherein the control message is a MAC-CE.

Aspect 14: The method of any of aspects 1 through 13, wherein the configuration message is a RRC message.

Aspect 15: A method for wireless communication by a base station, comprising: identifying a configuration indicating that a CORESET for a downlink control channel is associated with a plurality of TCI states; transmitting, to a UE, a configuration message indicating the identified configuration; and transmitting, to the UE, a control message activating one or more TCI states of the plurality of TCI states for the CORESET.

Aspect 16: The method of aspect 15, further comprising: transmitting, to the UE, a downlink control message via the downlink control channel according to the one or more activated TCI states for the CORESET.

Aspect 17: The method of any of aspects 15 through 16, wherein the control message comprises an indication that a single TCI state is activated for the CORESET; the indication indicates a first TCI state that is activated; and the one or more activated TCI states comprise the first TCI state.

Aspect 18: The method of any of aspects 15 through 16, wherein the control message comprises an indication that two TCI states are activated for the CORESET; the indication indicates that a first TCI state and a second TCI state are activated; and the one or more activated TCI states comprise the first TCI state and the second TCI state.

Aspect 19: The method of any of aspects 15 through 18, wherein transmitting the configuration message comprises: transmitting an indication of the one or more activated TCI states, wherein the indication comprises a TCI state ID.

Aspect 20: The method of any of aspects 15 through 19, wherein transmitting the configuration message comprises: transmitting an indication of the one or more TCI states, wherein the indication comprises one or more indices associated with the one or more activated TCI states.

Aspect 21: The method of any of aspects 15 through 20, wherein the control message comprises a first field configured to indicate a first TCI state, a second field configured to indicate a second TCI state, and a third field configured to indicate which TCI state of the first TCI state, the second TCI state, or both TCI states are activated.

Aspect 22: The method of any of aspects 15 through 21, wherein the control message comprises a dynamic number of fields based at least in part on a quantity of activated TCI states.

Aspect 23: The method of any of aspects 15 through 22, wherein the configuration message further indicates that the plurality of TCI states are mapped using either a FDM mapping, a TDM mapping, or a space division multiplexing mapping.

Aspect 24: The method of any of aspects 15 through 23, wherein the configuration message further indicates parameters for mapping the plurality of TCI states using at least two of a FDM mapping scheme, a TDM mapping scheme, and a space division multiplexing mapping scheme; and the control message indicates one of the FDM mapping scheme, the TDM mapping scheme, or the space division multiplexing mapping scheme for mapping of the one or more activated TCI states.

Aspect 25: The method of any of aspects 15 through 24, wherein the control message comprises an indication of a group of CCs to which the control message pertains.

Aspect 26: The method of any of aspects 15 through 25, wherein the control message is a MAC control element.

Aspect 27: The method of any of aspects 15 through 26, wherein the configuration message is a RRC message.

Aspect 28: A method for wireless communications at a UE, comprising: receiving, from a base station, a configuration message indicating that a CORESET is associated with a plurality of activated TCI states; receiving a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission comprising scheduling information for a PDSCH transmission; identifying, based at least in part on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the plurality of activated TCI states to apply to a reception of the PDSCH transmission; and decoding the PDSCH transmission in accordance with the at least one TCI state.

Aspect 29: The method of aspect 28, wherein the identifying is based at least in part on a scheduling offset for the PDSCH transmission that is larger than a threshold scheduling offset.

Aspect 30: The method of aspect 29, wherein the threshold scheduling offset is a time duration for QCL.

Aspect 31: The method of any of aspects 28 through 30, further comprising:

receiving, from the base station, a control message activating two TCI states for the CORESET, wherein the at least one TCI state to apply to the reception of the PDSCH transmission comprises at least one of the two activated TCI states.

Aspect 32: The method of aspect 31, further comprising: determining, based at least in part on the scheduling information for the PDSCH transmission, to apply one of the two activated TCI states to the reception of the PDSCH transmission.

Aspect 33: The method of aspect 32, further comprising: identifying one of the two activated TCI states to apply to the reception of the PDSCH transmission based at least in part on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within the control message each indicating one of the two activated TCI states.

Aspect 34: The method of aspect 35, further comprising: determining, based at least in part on the scheduling information for the PDSCH transmission, to apply both of the two activated TCI states to the reception of the PDSCH transmission.

Aspect 36: The method of any of aspects 37 through 38, further comprising: decoding the physical downlink control transmission based at least in part on the configuration message and at least one of the two activated TCI states.

Aspect 39: A method for wireless communications at a UE, comprising: receiving, from a base station, a configuration message indicating that a CORESET is associated with a plurality of activated TCI states; receiving a physical downlink control transmission, the physical downlink control transmission comprising scheduling information for a PDSCH transmission; identifying, based at least in part on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the plurality of activated TCI states to apply to a reception of the PDSCH transmission; and decoding the PDSCH transmission in accordance with the at least one TCI state.

Aspect 40: The method of aspect 39, wherein the threshold scheduling offset is a time duration for QCL.

Aspect 41: The method of any of aspects 39 through 40, further comprising: identifying one or more CORESETs each associated with a transmission received prior to decoding the PDSCH transmission; determining a subset of the one or more CORESETs that excludes CORESETs of the one or more CORESETs that are associated with a plurality of activated TCI states; and identifying a CORESET from the subset of the one or more CORESETs having a CORESET ID with a value less than each CORESET ID of other CORESETs from the subset of the one or more CORESETs, wherein the at least one TCI state to apply to the reception of the PDSCH transmission comprises a TCI state associated with the identified CORESET having the CORESET ID with the value less than each CORESET ID of other CORESETs.

Aspect 42: The method of any of aspects 39 through 43, further comprising: identifying the CORESET associated with two activated TCI states, wherein the at least one TCI state to apply to the reception of the PDSCH transmission comprises at least one of the two activated TCI states.

Aspect 44: The method of aspect 45 wherein identifying the CORESET further comprises: identifying one or more CORESETs associated with a transmission received prior to identifying the CORESET; and determining that a CORESET ID with a lowest value from each CORESET ID of the one or more CORESETs is the CORESET ID identifying the CORESET.

Aspect 46: The method of any of aspects 47 through 48, further comprising: determining to apply one of the two activated TCI states to the reception of the PDSCH transmission.

Aspect 49: The method of aspect 46, further comprising: identifying one of the two activated TCI states to apply to the reception of the PDSCH transmission based at least in part on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within a control message each indicating one of the two activated TCI states.

Aspect 50: The method of any of aspects 51 through 52, further comprising: determining to apply both of the two activated TCI states to the reception of the PDSCH transmission.

Aspect 53: The method of any of aspects 54 through 50, further comprising: decoding the physical downlink control transmission based at least in part on the configuration message and at least one of the two activated TCI states.

Aspect 55: A method for wireless communications at a base station, comprising: transmitting, to a UE, a configuration message indicating that a CORESET is associated with a plurality of activated TCI states; transmitting, to the UE, a physical downlink control transmission over the CORESET in accordance with the configuration message, the physical downlink control transmission comprising scheduling information for a PDSCH transmission; identifying, based at least in part on an absence of a TCI field included in the scheduling information that indicates a TCI state for the PDSCH transmission, at least one TCI state of the plurality of activated TCI states to apply to a transmission of the PDSCH transmission; and transmitting the PDSCH transmission in accordance with the at least one TCI state.

Aspect 56: The method of aspect 55, wherein the scheduling information for the PDSCH transmission defines a scheduling offset for the PDSCH transmission that is larger than a threshold scheduling offset.

Aspect 57: The method of aspect 56, wherein the threshold scheduling offset is a time duration for QCL.

Aspect 58: The method of any of aspects 55 through 57, further comprising: transmitting, to the UE, a control message activating two TCI states for the CORESET, wherein the at least one TCI state to apply to the reception of the PDSCH transmission comprises at least one of the two activated TCI states.

Aspect 59: The method of aspect 58, wherein transmitting the PDSCH transmission further comprises: transmitting the PDSCH transmission in accordance with one of the two activated TCI states.

Aspect 60: The method of aspect 59, further comprising: identifying the one of the two activated TCI states to apply to the reception of the PDSCH transmission based at least in part on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within the control message each indicating one of the two activated TCI states.

Aspect 61: The method of aspect 58, wherein transmitting the PDSCH transmission further comprises: transmitting the PDSCH transmission in accordance with both of the two activated TCI states.

Aspect 62: The method of any of aspects 58 through 61, further comprising: transmitting the physical downlink control transmission based at least in part on the configuration message and at least one of the two activated TCI states.

Aspect 63: A method for wireless communications at a base station, comprising: transmitting, to a UE, a configuration message indicating that a CORESET is associated with a plurality of activated TCI states; transmitting, to the UE, a physical downlink control transmission, the physical downlink control transmission comprising scheduling information for a PDSCH transmission; identifying, based at least in part on a scheduling offset for the PDSCH transmission being less than a threshold scheduling offset, at least one TCI state of the plurality of activated TCI states to apply to a transmission of the PDSCH transmission; and transmitting the PDSCH transmission in accordance with the at least one TCI state.

Aspect 64: The method of aspect 63, wherein the threshold scheduling offset is a time duration for QCL.

Aspect 65: The method of any of aspects 63 through 64, further comprising: identifying the CORESET associated with two activated TCI states, wherein the at least one TCI state to apply to the reception of the PDSCH transmission comprises at least one of the two activated TCI states.

Aspect 66: The method of aspect 65, wherein identifying the CORESET further comprises: identifying one or more CORESETs associated with a transmission transmitted prior to identifying the CORESET; and determining that a CORESET ID with a lowest value from each CORESET ID of the one or more CORESETs is the CORESET ID identifying the CORESET.

Aspect 67: The method of any of aspects 65 through 66, wherein transmitting the PDSCH transmission further comprises: transmitting the PDSCH transmission in accordance with one of the two activated TCI states.

Aspect 68: The method of aspect 67, further comprising: identifying the one of the two activated TCI states to apply to the reception of the PDSCH transmission based at least in part on a relative value of a TCI state ID for each of the two activated TCI states or a relative position of two fields within a control message each indicating one of the two activated TCI states.

Aspect 69: The method of any of aspects 65 through 70, wherein transmitting the PDSCH transmission further comprises: transmitting the PDSCH transmission in accordance with both of the two activated TCI states.

Aspect 71: The method of any of aspects 65 through 69, further comprising: transmitting the physical downlink control transmission based at least in part on the configuration message and at least one of the two activated TCI states.

Aspect 72: An apparatus for wireless communication by a UE, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of aspects 1 through 14.

Aspect 73: An apparatus for wireless communication by a UE, comprising at least one means for performing a method of any of aspects 1 through 14.

Aspect 75: An apparatus for wireless communication by a base station, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of aspects 15 through 27.

Aspect 76: An apparatus for wireless communication by a base station, comprising at least one means for performing a method of any of aspects 15 through 27.

Aspect 77: A non-transitory computer-readable medium storing code for wireless communication by a base station, the code comprising instructions executable by a processor to perform a method of any of aspects 15 through 27.

Aspect 79: An apparatus for wireless communications at a UE, comprising at least one means for performing a method of any of aspects 28 through 36.

Aspect 80: A non-transitory computer-readable medium storing code for wireless communications at a UE, the code comprising instructions executable by a processor to perform a method of any of aspects 28 through 36.

Aspect 81: An apparatus for wireless communications at a UE, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of aspects 39 through 53.

Aspect 82: An apparatus for wireless communications at a UE, comprising at least one means for performing a method of any of aspects 39 through 53.

Aspect 83: A non-transitory computer-readable medium storing code for wireless communications at a UE, the code comprising instructions executable by a processor to perform a method of any of aspects 39 through 53.

Aspect 85: An apparatus for wireless communications at a base station, comprising at least one means for performing a method of any of aspects 55 through 62.

Aspect 88: An apparatus for wireless communications at a base station, comprising at least one means for performing a method of any of aspects 63 through 71.

Aspects 1 through 76 (or aspects of the aspects 1 through 76) may be combined with aspects or embodiments disclosed in other implementations.