Control resource set determination for multiple transmission-reception point configurations

The described techniques provide for efficiently monitoring for control information from a single transmission-reception point (TRP) after transitioning from a multi-TRP operation mode to a single-TRP operation mode. If a user equipment (UE) is communicating with a first TRP and a second TRP in a multi-TRP operation mode, and the UE is directed to transition to communicating with the first TRP in a single-TRP operation mode, the UE may limit the number of CORESETs monitored in the single-TRP operation mode to a maximum number of CORESETs configured for the single-TRP operation mode. That is, if the number of CORESETs monitored by the UE for control information from the first TRP in the multi-TRP mode exceeds the maximum number of CORESETs configured for the single-TRP operation mode, the UE may identify a subset of the CORESETs to monitor for control information from the first TRP in the single-TRP mode.

BACKGROUND

The following relates generally to wireless communications and more specifically to control resource set (CORESET) determination for multiple transmission-reception point configurations.

A wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE). In some wireless communications systems, a UE may support communications with multiple transmission-reception points (TRPs) to improve throughput or improve the reliability of communications in the wireless systems. In some cases (e.g., when data traffic projections are low and/or channel conditions are stable), the UE may transition to communicating with a single TRP in a single-TRP operation mode. Some techniques for transitioning from a multi-TRP operation mode to a single-TRP operation mode may be deficient.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support control resource set (CORESET) determination for multiple transmission-reception point (TRP) configurations. Generally, the described techniques provide for efficiently monitoring for control information from a single TRP after transitioning from a multi-TRP operation mode to a single-TRP operation mode. If a user equipment (UE) is communicating with a first TRP and a second TRP in a multi-TRP operation mode, and the UE is directed to transition to communicating with the first TRP in a single-TRP operation mode, the UE may limit the number of CORESETs monitored in the single-TRP operation mode to a maximum number of CORESETs configured for the single-TRP operation mode. That is, if the number of CORESETs monitored by the UE for control information from the first TRP in the multi-TRP mode exceeds the maximum number of CORESETs configured for the single-TRP operation mode, the UE may identify a subset of the CORESETs to monitor for control information from the first TRP in the single-TRP mode.

A method for wireless communication at a UE is described. The method may include monitoring, in a multi-transmission-reception point operation mode, a first set of control resource sets for control information from a first transmission-reception point and a second set of control resource sets for control information from a second transmission-reception point, receiving an indication to transition from the multi-transmission-reception point operation mode to a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, identifying a subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on the indication, and monitoring the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode.

An apparatus for wireless communication at a UE is described. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to monitor, in a multi-transmission-reception point operation mode, a first set of control resource sets for control information from a first transmission-reception point and a second set of control resource sets for control information from a second transmission-reception point, receive an indication to transition from the multi-transmission-reception point operation mode to a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, identify a subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on the indication, and monitor the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode.

Another apparatus for wireless communication at a UE is described. The apparatus may include means for monitoring, in a multi-transmission-reception point operation mode, a first set of control resource sets for control information from a first transmission-reception point and a second set of control resource sets for control information from a second transmission-reception point, receiving an indication to transition from the multi-transmission-reception point operation mode to a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, identifying a subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on the indication, and monitoring the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode.

A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to monitor, in a multi-transmission-reception point operation mode, a first set of control resource sets for control information from a first transmission-reception point and a second set of control resource sets for control information from a second transmission-reception point, receive an indication to transition from the multi-transmission-reception point operation mode to a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, identify a subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on the indication, and monitor the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the indication to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode includes a first indication. Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a second indication of the subset of the first set of control resource sets, and identifying the subset of the first set of control resource sets based on the second indication. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first indication and the second indication may be received in a radio resource control message. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first indication and the second indication may be received in a medium access control (MAC) control element (MAC-CE) or a downlink control information (DCI) message. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the single-transmission-reception point operation mode includes a temporary single-transmission-reception point operation mode in a radio resource control configured multi-transmission-reception point operation mode.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the second indication of the subset of the first set of control resource sets may include operations, features, means, or instructions for receiving an indication of control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the indication of control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets may include operations, features, means, or instructions for receiving a predefined garbage value in a transmission configuration indication field that corresponds to each of the control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying the subset of the first set of control resource sets may include operations, features, means, or instructions for identifying the subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on a predefined rule. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the indication to transition may be received from the first transmission-reception point, and identifying and monitoring the subset of the first set of control resource sets may include operations, features, means, or instructions for identifying and monitoring the subset of the first set of control resource sets upon receiving the indication to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the indication to transition may be received from the second transmission-reception point, and identifying and monitoring the subset of the first set of control resource sets may include operations, features, means, or instructions for identifying and monitoring the subset of the first set of control resource sets upon receiving the indication to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode or identifying and monitoring the subset of the first set of control resource sets once a configured duration of time may have expired after receiving the indication to transition from the multi-transmission-reception point.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the indication to transition may be received from the second transmission-reception point, and identifying and monitoring the subset of the first set of control resource sets may include operations, features, means, or instructions for receiving a triggering signal to trigger the transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode, and identifying and monitoring the subset of the first set of control resource sets upon receiving the triggering signal.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the predefined rule indicates that the UE may be to select the subset of the first set of control resource sets having a lowest set of indices, and identifying the subset of the first set of control resource sets based on the predefined rule may include operations, features, means, or instructions for identifying a number of control resource sets corresponding to the control resource set limit for the single-transmission-reception point operation mode, selecting the number of control resource sets having the lowest set of indices from the first set of control resource sets, and identifying the subset of the first set of control resource sets based on the selecting, where the subset of the first set of control resource sets includes the number of control resource sets having the lowest set of indices from the first set of control resource sets.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving another indication to transition back from the single-transmission-reception point operation mode to the multi-transmission-reception point operation mode. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the indication to transition from the multi-transmission-reception point operating mode to the single-transmission-reception point operation mode may include a first indication, and the other indication to transition back from the single-transmission-reception point operation mode to the multi-transmission-reception point operation mode may include a second indication.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a third indication of the first set of control resource sets to monitor for control information from the first transmission-reception point after transitioning back to the multi-transmission-reception point operation mode. 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 first set of control resource sets to monitor for control information from the first transmission-reception point after transitioning back to the multi-transmission-reception point operation mode based on a predefined rule.

A method for wireless communication at a base station is described. The method may include transmitting, to a UE operating in a multi-transmission-reception point operation mode, control information on a first set of control resource sets using a first transmission-reception point and control information on a second set of control resource sets using a second transmission-reception point, identifying a subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the UE using the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, transmitting, to the UE, an indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode, and transmitting, to the UE, control information on the subset of the first set of control resource sets after the UE transitions to the single-transmission-reception point.

An apparatus for wireless communication at a base station is described. The apparatus may include a processor, memory in electronic communication 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 operating in a multi-transmission-reception point operation mode, control information on a first set of control resource sets using a first transmission-reception point and control information on a second set of control resource sets using a second transmission-reception point, identify a subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the UE using the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, transmit, to the UE, an indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode, and transmit, to the UE, control information on the subset of the first set of control resource sets after the UE transitions to the single-transmission-reception point.

Another apparatus for wireless communication at a base station is described. The apparatus may include means for transmitting, to a UE operating in a multi-transmission-reception point operation mode, control information on a first set of control resource sets using a first transmission-reception point and control information on a second set of control resource sets using a second transmission-reception point, identifying a subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the UE using the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, transmitting, to the UE, an indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode, and transmitting, to the UE, control information on the subset of the first set of control resource sets after the UE transitions to the single-transmission-reception point.

A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to transmit, to a UE operating in a multi-transmission-reception point operation mode, control information on a first set of control resource sets using a first transmission-reception point and control information on a second set of control resource sets using a second transmission-reception point, identify a subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the UE using the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, transmit, to the UE, an indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode, and transmit, to the UE, control information on the subset of the first set of control resource sets after the UE transitions to the single-transmission-reception point.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode may include a first indication. Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a second indication of the subset of the first set of control resource sets. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first indication and the second indication may be transmitted in a radio resource control message. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first indication and the second indication may be transmitted in a MAC-CE or a DCI message.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the single-transmission-reception point operation mode includes a temporary single-transmission-reception point operation mode in a radio resource control configured multi-transmission-reception point operation mode. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the second indication of the subset of the first set of control resource sets may include operations, features, means, or instructions for transmitting an indication of control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the indication of control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets may include operations, features, means, or instructions for transmitting a predefined garbage value in a transmission configuration indication field that corresponds to each of the control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying the subset of the first set of control resource sets may include operations, features, means, or instructions for identifying the subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE may be in the single-transmission-reception point operation mode based on a predefined rule. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode may include operations, features, means, or instructions for transmitting the indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode using the first transmission-reception point or the second transmission reception point.

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 indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode using the second transmission-reception point, and transmitting a triggering signal using the first transmission-reception point to trigger the transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the predefined rule indicates that the base station is to select the subset of the first set of control resource sets having a lowest set of indices, and identifying the subset of the first set of control resource sets based on the predefined rule may include operations, features, means, or instructions for identifying a number of control resource sets corresponding to the control resource set limit for the single-transmission-reception point operation mode, selecting the number of control resource sets having the lowest set of indices from the first set of control resource sets, and identifying the subset of the first set of control resource sets based on the selecting, where the subset of the first set of control resource sets includes the number of control resource sets having the lowest set of indices from the first set of control resource sets.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting another indication for the UE to transition back from the single-transmission-reception point operation mode to the multi-transmission-reception point operation mode. In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the indication to transition from the multi-transmission-reception point operating mode to the single-transmission-reception point operation mode includes a first indication, and the other indication to transition back from the single-transmission-reception point operation mode to the multi-transmission-reception operation mode includes a second indication.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting a third indication of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point after the UE transitions back to the multi-transmission-reception point operation mode. 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 first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point after the UE transitions back to the multi-transmission-reception point operation mode based on a predefined rule.

DETAILED DESCRIPTION

In some wireless communications systems, a UE may support communications with multiple transmission-reception points (TRPs) to improve throughput or improve the reliability of communications. For instance, when operating in a multi-TRP operation mode, the UE may simultaneously receive different downlink data from multiple TRPs, resulting in improved throughput, or the UE may receive the same downlink data from multiple TRPs, resulting in improved reliability (e.g., a higher chance that the data is received by the UE). While communications with multiple TRPs may improve throughput and reliability, such communications may also result in high power consumption at a UE (e.g., since the UE may maintain multiple beams for communicating with the multiple TRPs). Thus, in some cases (e.g., when channel conditions are stable and/or data traffic projections are low), it may be appropriate for the UE to save power by transitioning to communicating with a single TRP in a single-TRP operation mode.

For example, it may be appropriate for a UE communicating with a first TRP and a second TRP in a multi-TRP operation mode to switch to communicating with the first TRP in a single-TRP operation mode. In some systems, however, though the UE may transition from the multi-TRP operation mode to the single-TRP operation mode, the UE may be configured to monitor for control information in a same number of control resource sets (CORESETs) in the single-TRP operation mode (e.g., the same as the number of CORESETs monitored for control information from the first TRP in the multi-TRP operation mode). In such systems, if the number of CORESETs exceeds a maximum number of CORESETs configured for the single-TRP operation mode, the UE power savings associated with switching to the single-TRP operation mode may be limited (e.g., since the UE may be monitoring more CORESETs than the maximum number of CORESETs configured for the single-TRP operation mode).

As described herein, a UE may support efficient techniques for monitoring for control information from a single TRP after transitioning from a multi-TRP operation mode to a single-TRP operation mode. If a user equipment (UE) is communicating with a first TRP and a second TRP in a multi-TRP operation mode, and the UE is directed to transition to communicating with the first TRP in a single-TRP operation mode, the UE may limit the number of CORESETs monitored in the single-TRP operation mode to a maximum number of CORESETs configured for the single-TRP operation mode. That is, if the number of CORESETs monitored by the UE for control information from the first TRP in the multi-TRP mode exceeds the maximum number of CORESETs configured for the single-TRP operation mode, the UE may identify a subset of the CORESETs to monitor for control information from the first TRP in the single-TRP mode. Because the UE may limit the number of CORESETs monitored for control information in the single-TRP operation mode, the power savings associated with transitioning from a multi-TRP operation mode to a single-TRP operation mode may be improved.

Aspects of the disclosure introduced above are described below in the context of a wireless communications system. Examples of processes and signaling exchanges that support CORESET determination for multiple TRP configurations are then described. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to CORESET determination for multiple TRP configurations.

Each base station105may be associated with a particular geographic coverage area110in which communications with various UEs115is supported. Each base station105may provide communication coverage for a respective geographic coverage area110via communication links125, and communication links125between a base station105and a UE115may utilize one or more carriers. Communication links125shown in wireless communications system100may include uplink transmissions from a UE115to a base station105(e.g., in a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH)), or downlink transmissions from a base station105to a UE115(e.g., in a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH)). Downlink transmissions may also be called forward link transmissions while uplink transmissions may also be called reverse link transmissions.

Wireless communications system100may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band, since the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features. However, the waves may penetrate structures sufficiently for a macro cell to provide service to UEs115located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter range (e.g., less than 100 km) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz. Wireless communications system100may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band. The SHF region includes bands such as the 5 GHz industrial, scientific, and medical (ISM) bands, which may be used opportunistically by devices that may be capable of tolerating interference from other users.

In some cases, UEs115and base stations105may support retransmissions of data to increase the likelihood that data is received successfully. HARQ feedback is one technique of increasing the likelihood that data is received correctly over a communication link125. In some cases, HARQ feedback may include an acknowledgement (ACK) indicating that a transmission was successfully received and decoded or a negative ACK (NACK) indicating that a transmission was not successfully received or decoded. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise conditions). In some cases, a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.

In some aspects, a UE115may support communications with a single TRP. In such aspects, the UE115may be configured to monitor up to three CORESETs per bandwidth part (BWP) for control information from the single TRP. A CORESET may be a set of resources (e.g., frequency and time resource) that may include control information in one or more PDCCHs. Coresets (e.g., the resources for different CORESETs) may be configured by RRC signaling with a transmission configuration indicator (TCI) state (e.g., a bit value corresponding to a transmit beam used to transmit control information in the CORESET), and a UE115may monitor each CORESET for PDCCH blind detection by using a receive beam corresponding to the TCI state configured with the CORESET. In some examples, the maximum number of CORESETs that a UE115may support (e.g., when operating in a single-TRP operation mode) may be equal to or less than three (e.g., where the exact value is included in a UE capability report transmitted by the UE115to a base station105).

In some wireless systems, in addition to supporting communications with a single TRP, a UE115may support communications with multiple TRPs.

FIG. 2illustrates an example of a wireless system200that supports communications between a UE115-aand multiple TRPs205. Wireless system200may support multiple-PDCCH based multi-TRP or multi-panel transmission with intra-cell (e.g., where TRP205-aand TRP205-bare associated with a same cell ID) and inter-cell (e.g., where TRP205-aand TRP205-bare associated with different cell IDs). In the example ofFIG. 2, UE115-amay receive an RRC configuration from a base station105that may link multiple PDCCH/PDSCH pairs with multiple TRPs. In some cases, though the maximum number of CORESETs that a UE115may support when communicating with a single TRP may be three or less, the maximum number of CORESETs that a UE115may support when communicating with multiple TRPs (e.g., the maximum number of CORESETs per PDCCH-config, where each CORESET in a PDCCH-config corresponds to one TRP) may be greater than three (e.g., four, five, six). Further, as with a single TRP deployment, the maximum number of CORESETs that a UE115may support may be included in a UE capability report.

FIG. 3illustrates an example of CORESETs300monitored by a UE115for control information from multiple TRPs in accordance with aspects of the present disclosure. In the example ofFIG. 3, the UE115may monitor CORESETs305(e.g., with IDs #0 and #1) for control information from a first TRP and CORESETs310(e.g., with IDs #2 and #3) for control information from a second TRP. In other examples, the number of CORESETs assigned to each TRP may be different. For instance, six CORESETs may be distributed for two-TRP operation under the constraint of a total limit, N1+N2≤6, by assigning one CORESET to the first TRP and five CORESETs to the second TRP, two CORESETs to the first TRP and four CORESETs to the second TRP, three CORESETs to the first TRP and three CORESETs to the second TRP, four CORESETs to the first TRP and two CORESETs to the second TRP, or five CORESETs to the first TRP and one CORESET to the second TRP. Alternatively, six CORESETs may be distributed for two-TRP operation under the constraint of a total limit, N1+N2≤6 and a per-TRP limit, N1≤4 and N2≤4, by assigning two CORESETs to the first TRP and four CORESETs to the second TRP, three CORESETs to the first TRP and three CORESETs to the second TRP, or four CORESETs to the first TRP and two CORESETs to the second TRP.

By supporting communications with multiple TRPs, a UE115may be able to improve throughput and improve the reliability of communications in a wireless communications system. For instance, when operating in a multi-TRP operation mode, the UE115may simultaneously receive different downlink data from multiple TRPs, resulting in improved throughput, or the UE115may receive the same downlink data from multiple TRPs, resulting in improved reliability (e.g., a higher chance that the data is received by the UE115). While communications with multiple TRPs may improve throughput and reliability, such communications may also result in high power consumption at a UE (e.g., since the UE may maintain multiple beams for communicating with the multiple TRPs).

Thus, in some cases (e.g., when channel conditions are stable and/or data traffic projections are low), it may be appropriate for the UE to save power by transitioning to communicating with a single TRP in a single-TRP operation mode. For example, it may be appropriate for a UE communicating with a first TRP and a second TRP in a multi-TRP operation mode to switch to communicating with the first TRP in a single-TRP operation mode.

FIG. 4illustrates an example400of a multi-TRP operation mode and a single-TRP operation mode between which a UE may transition (e.g., where a multi-TRP operation mode is an operation mode in which a UE115may communicate with multiple TRPs and a single-TRP operation mode is an operation mode in which a UE115may communicate with a single TRP). In some systems, however, though the UE may transition from the multi-TRP operation mode to the single-TRP operation mode, the UE may be configured to monitor for control information in a same number of CORESETs in the single-TRP operation mode (e.g., the same as the number of CORESETs monitored for control information from the first TRP in the multi-TRP operation mode).

For instance, in the example ofFIG. 4, in a multi-TRP operation mode, a UE115may monitor CORESETs with IDs 0, 1, 2, and 4 for control information from a first TRP405-a, and the UE115may monitor CORESETs with IDs 3 and 5 for control information from a second TRP405-b. Once the UE115-bswitches to the single-TRP operation mode, the UE115-bmay still be configured to monitor for control information from CORESETs with IDs 0, 1, 2, and 4 (as shown) despite switching to the single-TRP operation mode to save power. If the number of CORESETs exceeds a maximum number of CORESETs configured for the single-TRP operation mode (e.g., as shown inFIG. 4for a maximum of three CORESETs configured for the single-TRP operation mode), the power savings associated with switching to the single-TRP operation mode may be limited (e.g., since the UE115-bmay be monitoring more CORESETs than the maximum number of CORESETs configured for the single-TRP operation mode). A UE115in wireless communications system100may support efficient techniques for monitoring for control information from a single TRP after transitioning from a multi-TRP operation mode to a single-TRP operation mode.

FIG. 5illustrates an example of a wireless communications system500that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. Wireless communications system500includes base station105-a, which may be an example of a base station105described with reference toFIGS. 1-4. Wireless communications system500also includes UE115-c, which may be an example of a UE115described with reference toFIGS. 1-4. Base station105-amay provide communication coverage for a geographical coverage area110-a, which may be an example of a coverage area110described with reference toFIG. 1. Wireless communications system500may implement aspects of wireless communications system100. For instance, UE115-cin wireless communications system500may support efficient techniques for monitoring for control information from a single TRP after transitioning from a multi-TRP operation mode to a single-TRP operation mode.

In the example ofFIG. 5, UE115-cmay initially be configured to communicate with at least a first TRP and a second TRP in a multi-TRP operation mode. For instance, UE115-cmay receive a control message (e.g., RRC message) from base station105-aindicating that UE115-cis to communicate with the first TRP and the second TRP in the multi-TRP operation mode. The control message may also indicate CORESETs for the UE115-cto monitor for control information from each TRP in the multi-TRP operation mode. Thus, UE115-cmay monitor a first set of CORESETs for control information from the first TRP and a second set of CORESETs for control information from the second TRP. In some cases, after a period of time in the multi-TRP operation mode, the UE115-cmay be directed to transition to a single-TRP operation mode to save power (e.g., if data traffic projections are low or channel conditions are good). In such cases, the UE115-cmay use the techniques described herein to limit the number of CORESETs monitored for control information from a single TRP (e.g., the first TRP) after transitioning from the multi-TRP operation mode to the single-TRP operation mode.

Specifically, if UE115-cis communicating with a first TRP and a second TRP in a multi-TRP operation mode, and the UE115-cis directed to transition to communicating with the first TRP in a single-TRP operation mode, the UE115-cmay limit the number of CORESETs monitored in the single-TRP operation mode to a maximum number of CORESETs configured for the single-TRP operation mode. That is, if the number of CORESETs monitored by the UE115-cfor control information from the first TRP in the multi-TRP mode exceeds the maximum number of CORESETs configured for the single-TRP operation mode, the UE115-cmay identify a subset of the CORESETs to monitor for control information from the first TRP in the single-TRP operation mode (e.g., a subset that includes the maximum number of CORESETs).

In some cases, UE115-cmay receive a CORESET configuration505that indicates the subset of the CORESETs for the UE115-cto monitor for control information from the first TRP in the single-TRP operation mode (e.g., as described with reference toFIGS. 6-8). In other cases, UE115-cmay identify the subset of the CORESETs to monitor for control information from the first TRP in the single-TRP operation mode based on a predefined rule (e.g., as described with reference toFIG. 9). Once the UE115-cidentifies the subset of the CORESETs to monitor and transitions to the single-TRP operation mode, the UE115-cmay receive control information in a PDCCH510in any of the CORESETs in the subset of CORESETs from the first TRP in the single-TRP operation mode.

FIG. 6illustrates an example600of a multi-TRP operation mode and a single-TRP operation mode between which a UE may transition in accordance with aspects of the present disclosure. In the example ofFIG. 6, UE115-dmay initially be configured to communicate with a first TRP605-aand a second TRP605-bin a multi-TRP operation mode and may monitor a first set of CORESETs with IDs 0, 1, 2, and 4 for control information from the first TRP605-aand a second set of CORESETs with IDs 3 and 5 for control information from the second TRP605-b. After some time, UE115-dmay receive an RRC message610indicating that UE115-dis to transition from the multi-TRP operation mode to a single-TRP operation mode. As mentioned with reference toFIG. 5, the RRC message (e.g., the PDCCH-config information element in the RRC message) may also indicate (e.g., explicitly) a subset of the first set of CORESETs (e.g., M1 CORESETs, where M1≤3) for UE115-dto monitor for control information from the first TRP605-aafter transitioning to the single-TRP operation mode.

Thus, UE115-dmay identify the subset of the first set of CORESETs (e.g., CORESETs with IDs 0, 1, and 2) to monitor for control information from the first TRP605-aafter transitioning to the single-TRP operation mode based on the indication in the RRC message. Since the number of CORESETs for UE115-dto monitor in the single-TRP operation mode may be reduced to the maximum number of CORESETs configured for the single-TRP operation mode (or less) (e.g., compared to the example described with reference toFIG. 4, where the number of CORESETs for the UE115-bto monitor may not be reduced), the UE115-dmay be able to improve power savings in the single-TRP operation mode. In particular, the processing power and complexity associated with monitoring CORESETs in the single-TRP operation mode may be reduced.

FIG. 7illustrates an example700of a multi-TRP operation mode and a single-TRP operation mode between which a UE may transition in accordance with aspects of the present disclosure. In the example ofFIG. 7, UE115-emay initially be configured to communicate with a first TRP705-ain a single-TRP operation mode and may monitor a set of CORESETs with IDs 0, 1, and 4 for control information from the first TRP705-a. The UE115-emay then receive an RRC message710(e.g., or semi-static control message) indicating that UE115-eis to transition from the single-TRP operation mode to a multi-TRP operation mode and monitor a first set of CORESETs with IDs 0, 1, 2, and 4 for control information from the first TRP705-aand a second set of CORESETs with IDs 3 and 5 for control information from the second TRP705-b.

After operating in the RRC configured multi-TRP operation mode, it may be appropriate for UE115-eto temporarily transition to a single-TRP operation mode to save power. Accordingly, a base station105may transmit, and UE115-emay receive, a dynamic control message715(e.g., downlink control information (DCI) message or MAC control element (MAC-CE)) indicating (e.g., using a go-to-sleep signal) that UE115-eis to transition to a temporary single-TRP operation mode. As illustrated, the temporary single-TRP operation mode may be within the RRC configured multi-TRP operation mode, where communications with the second TRP705-bmay be dynamically deactivated by the dynamic control message715and UE115-emay skip monitoring the CORESETs or PDCCHs from the second TRP705-b.

As mentioned with reference toFIG. 5, the dynamic control message715(e.g., the DCI message or MAC-CE) may also indicate (e.g., explicitly) a subset of the first set of CORESETs (e.g., M1 CORESETs, where M1≤3) for UE115-eto monitor for control information from the first TRP705-aafter transitioning to the temporary single-TRP operation mode. Thus, UE115-dmay identify the subset of the first set of CORESETs (e.g., CORESETs with IDs 0, 1, and 2) to monitor for control information from the first TRP705-aafter transitioning to the temporary single-TRP operation mode based on the indication in the dynamic control message715. Since the number of CORESETs for UE115-eto monitor in the single-TRP operation mode may be reduced to the maximum number of CORESETs configured for the single-TRP operation mode (or less), the UE115-dmay be able to improve power savings in the single-TRP operation mode. In particular, the processing power and complexity associated with monitoring CORESETs in the single-TRP operation mode may be reduced.

In some aspects, the first TRP705-amay transmit the dynamic control message715to UE115-e, and, in other aspects, the second TRP705-bmay transmit the dynamic control message715to UE115-e. Further, in some cases, the dynamic control message715may indicate the specific CORESETs in the first set of CORESETs for the UE115-eto monitor for control information from the first TRP705-aafter transitioning to the temporary single-TRP operation mode (e.g., which of the CORESETs in the first set of CORESETs are in the subset of CORESETs for the UE115-eto monitor). In other cases, the dynamic control message715may indicate the CORESETs in the first set of CORESETs that the UE115-eis to avoid monitoring for control information from the first TRP705-aafter transitioning to the temporary single-TRP operation mode (e.g., the dynamic control message715may indicate which of the CORESETs in the first set of CORESETs are excluded from the subset of CORESETs for the UE115-eto monitor).

FIG. 8illustrates an example of such other cases where the dynamic control message may indicate the CORESETs in the first set of CORESETs that the UE115-eis to avoid monitoring. In the example ofFIG. 8, the dynamic control message may be a UE-specific PDCCH MAC-CE which may deactivate other CORESETs in the first set of CORESETs that are not in the subset of CORESETs (e.g., the M_1 selected CORESETs). In particular, the dynamic control message may include a TCI state indication800including the serving cell ID805of the first TRP705-a, the CORESET ID810of the CORESET to be excluded from the subset of CORESETs (e.g., CORESET ID #4 in the example ofFIG. 7), and a predefined value (e.g., garbage value) for the TCI state ID815that indicates that the UE115-eis to avoid monitoring the CORESET corresponding to the CORESET ID810for control information from the first TRP705-ain the temporary single-TRP operation mode (e.g., a predefined garbage value that deactivates the CORESET with the indicated CORESET ID810).

In the examples described with reference toFIGS. 6-8, a UE115may receive an explicit indication of a subset of a first set of CORESETs to monitor for control information from a first TRP after transitioning to a single-TRP operation mode. In other examples, however, a UE115may be configured to determine the subset of the first set of CORESETs to monitor based on a predefined rule (e.g., based on one or more static conditions). In one aspect, the predefined rule may indicate that the subset of CORESETs is to include CORESETs in the first set of CORESETs having the lowest CORESET IDs. Accordingly, the UE115may identify the subset of the first set of CORESETs by selecting the maximum number of CORESETs configured for the single-TRP operation mode (or less) with the lowest indices from the first set of CORESETs. In this aspect, if the first set of CORESETs includes CORESETs with IDs 0, 1, 2, and 4, and the maximum number of CORESETs configured for the single-TRP operation mode is three (e.g., M1=3), the UE115may select the three CORESETs from the first set of CORESETs with the lowest indices to be included in the subset (e.g., CORESETs with IDs 0, 1, and 2).

In such examples where the UE115may identify the subset of the first set of CORESETs to monitor based on a predefined rule, it may be appropriate for the UE115to determine when to identify the subset of CORESETs and monitor the subset of CORESETs in the single-TRP operation mode (e.g., when to transition to the single-TRP operation mode).

FIG. 9illustrates examples of wireless systems900that may support different techniques for indicating to a UE115-fwhen the UE115-fis to identify a subset of CORESETs and monitor the subset of CORESETs for control information from a first TRP in a single-TRP operation mode.

In example wireless system900-a, TRP905-bmay coordinate with TRP905-avia backhaul communication910(e.g., to indicate that TRP905-bis to be deactivated), and UE115-fmay receive a signal920(e.g., ago-to-sleep signal) from TRP905-a(e.g., the serving TRP905-ain the single-TRP operation mode or a TRP different from the TRP905-bbeing deactivated) indicating that UE115-fis to deactivate a communication link with TRP905-b(e.g., skip monitoring for PDCCHs from TRP905-b), identify the subset of coresets to monitor for control information from TRP905-ain the single-TRP operation mode, and monitor the subset of coresets for control information from TRP905-ain the single-TRP operation mode (e.g., on communication link915). In this example, UE115-fmay reduce the number of coresets (e.g., to the subset of coresets) associated with the active TRP (e.g., TRP905-a) according to the predefined rule upon reception of the signal920.

In example wireless system900-b, TRP905-bmay coordinate with TRP905-avia backhaul communication910(e.g., to indicate that TRP905-bis to be deactivated), and UE115-fmay receive a signal925(e.g., a go-to-sleep signal) from TRP905-b(e.g., the TRP being deactivated) indicating that UE115-fis to deactivate a communication link with TRP905-b(e.g., skip monitoring PDCCHs from TRP905-b), identify the subset of coresets to monitor for control information from TRP905-ain the single-TRP operation mode, and monitor the subset of coresets for control information from TRP905-ain the single-TRP operation mode (e.g., on communication link915). In this example, UE115-fmay reduce the number of coresets (e.g., to the subset of coresets) associated with the active TRP (e.g., TRP905-a) according to the predefined rule upon reception of the signal925or once a threshold time has expired after receiving the signal925(e.g., X slots after receiving the signal925).

In example wireless system900-c, TRP905-bmay coordinate with TRP905-avia backhaul communication910(e.g., to indicate that TRP905-bis to be deactivated), and UE115-fmay receive a signal930(e.g., a go-to-sleep signal) from TRP905-b(e.g., the TRP being deactivated) indicating that UE115-fis to deactivate a communication link with TRP905-b(e.g., skip monitoring PDCCHs from TRP905-b). UE115-fmay then receive a triggering signal935from TRP905-aindicating that UE115-fis to identify the subset of coresets to monitor for control information from TRP905-ain the single-TRP operation mode (e.g., on communication link915) and monitor the subset of coresets for control information from TRP905-ain the single-TRP operation mode (e.g., on communication link915). In this example, UE115-fmay reduce the number of coresets (e.g., to the subset of coresets) associated with the active TRP (e.g., TRP905-a) according to the predefined rule upon reception of the triggering signal935.

FIG. 10illustrates an example of a process flow1000that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. Process flow1000illustrates aspects of techniques performed by a base station105-b, which may be an example of a base station105described with reference toFIGS. 1-9. Process flow1000also illustrates aspects of techniques performed by a UE115-g, which may be an example of a UE115described with reference toFIGS. 1-9.

At1005, UE115-gmay monitor, in a multi-TRP operation mode, a first set of CORESETs for control information from a first TRP and a second set of CORESETs for control information from a second TRP. At1010, UE115-gmay receive an indication to transition from the multi-TRP operation mode to a single-TRP operation mode, where the single TRP operation mode is associated with communicating with the first TRP, and where a number of CORESETs in the first set of CORESETs exceeds a CORESET limit for the single-TRP operation mode. Because the number of CORESETs in the first set of CORESETs exceeds the CORESET limit for the single-TRP operation mode, it may be appropriate for UE115-gto select a subset of the first set of CORESETs to monitor for control information from the first TRP in the single-TRP operation mode.

Thus, in some implementations, at1015, UE115-gmay receive an indication of the subset of the first set of CORESETs to monitor for control information from the first TRP in the single-TRP operation mode, and, at1020, UE115-gmay identify the subset of the first set of CORESETs to monitor for control information from the first TRP in the single-TRP operation mode based on the indication. In one example, the indication of the subset may be received in a semi-static control message (e.g., a higher layer message such as an RRC message), and, in another example, the indication of the subset may be received in a dynamic control message (e.g., a DCI message or MAC-CE). In some cases, the single-TRP operation mode is a temporary single-TRP operation mode in an RRC configured multi-TRP operation mode.

Further, in some cases, the transition indication received at1010and the indication of the subset is the same indication (e.g., where the transition indication is implied by the indication of the subset). In some aspects, UE115-gmay receive an indication of the CORESETs in the first set of CORESETs that are included in the subset of CORESETs, and, in other aspects, UE115-gmay receive an indication of the CORESETs in the first set of CORESETs that are exclude from the subset of CORESETs. In such other aspects, UE115-gmay receive a predefined (e.g., configured at the UE115-g) garbage value in a TCI state field that corresponds to each of the CORESETs in the first set of CORESETs excluded from the subset of CORESETs.

In other implementations, rather than identifying the subset of the first set of CORESETs to monitor for control information from the first TRP in the single-TRP operation mode based on a received CORESET indication, at1020, UE115-gmay identify the subset of CORESETs based on a predefined rule. In one example, the predefined rule may indicate that UE115-gis to select the subset of the first set of CORESETs having a lowest set of indices. Accordingly, UE115-gmay identify a number of CORESETs corresponding to the CORESET limit for the single-TRP operation mode, select the number of CORESETs having the lowest set of indices from the first set of CORESETs, and identify the subset of the first set of CORESETs based on the selecting, where the subset of the first set of CORESETs includes the number of CORESETs having the lowest set of indices from the first set of CORESETs.

In such other implementations, UE115-gmay support one or more techniques for determining when to identify and monitor the subset of the first set of CORESETs. In one example, UE115-gmay identify and monitor the subset of the first set of CORESETs upon receiving the indication to transition from the multi-TRP operation mode to the single-TRP operation mode, where the indication to transition is received from the first TRP. In another example, UE115-gmay identify and monitor the subset of the first set of CORESETs upon receiving the indication to transition from the multi-TRP operation mode to the single-TRP operation mode or once a configured duration of time has expired after receiving the indication to transition from the multi-TRP operation mode to the single-TRP operation mode, where the indication to transition is received from the second TRP. In yet another example, UE115-gmay receive a triggering signal to trigger the transition from the multi-TRP operation mode to the single-TRP operation mode, and UE115-gmay identify and monitor the subset of the first set of CORESETs upon receiving the triggering signal, where the indication to transition is received from the second TRP.

Once UE115-gidentifies the subset of the first set of CORESETs, at1025, UE115-gmay monitor the subset of the first set of CORESETs for control information from the first TRP in the single-TRP operation mode. Although the examples described herein relate to transitioning from a multi-TRP operation mode to a single-TRP operation mode, similar techniques may be used when transitioning from a single-TRP operation mode to a multi-TRP operation mode or when transitioning from communicating with any number of TRPs to communicating with any other number of TRPs. As an example, UE115-gmay receive another indication to transition back from the single-TRP operation mode to the multi-TRP operation mode. In this example, UE115-gmay receive another indication (e.g., in an RRC message, DCI message, or MAC-CE) of the first set of CORESETs (or another set of CORESETs) to monitor for control information from the first TRP after transitioning back to the multi-TRP operation mode. Alternatively, UE115-gmay identify the first set of CORESETs (or another set of CORESETs) to monitor for control information from the first TRP after transitioning back to the multi-TRP operation mode based on a predefined rule.

FIG. 11shows a block diagram1100of a device1105that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. The device1105may be an example of aspects of a UE115as described herein. The device1105may include a receiver1110, a communications manager1115, and a transmitter1120. The device1105may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The communications manager1115may monitor, in a multi-transmission-reception point operation mode, a first set of control resource sets for control information from a first transmission-reception point and a second set of control resource sets for control information from a second transmission-reception point, receive an indication to transition from the multi-transmission-reception point operation mode to a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, identify a subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on the indication, and monitor the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode. The actions performed by the communications manager815as described herein may be implemented to realize one or more potential advantages. One implementation may allow a UE115to decrease power consumption by switching to a single-TRP mode and communicating with a single TRP. Additionally or alternatively, the UE115may further decrease power consumption by monitoring a subset of control resource sets for control information from the TRP in the single-transmission-reception point operation mode. Another implementation may provide improved quality and reliability of service at the UE115, as latency and the number of separate resources allocated to the UE115may be reduced. The communications manager1115may be an example of aspects of the communications manager1410described herein.

The receiver1210may 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 CORESET determination for multiple TRP configurations). Information may be passed on to other components of the device1205. The receiver1210may be an example of aspects of the transceiver1420described with reference toFIG. 14. The receiver1210may utilize a single antenna or a set of antennas.

The communications manager1215may be an example of aspects of the communications manager1115as described herein. The communications manager1215may include a CORESET monitoring manager1220, a TRP operation mode manager1225, and a CORESET identifier1230. The communications manager1215may be an example of aspects of the communications manager1410described herein.

The CORESET monitoring manager1220may monitor, in a multi-transmission-reception point operation mode, a first set of control resource sets for control information from a first transmission-reception point and a second set of control resource sets for control information from a second transmission-reception point. The TRP operation mode manager1225may receive an indication to transition from the multi-transmission-reception point operation mode to a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode. The CORESET identifier1230may identify a subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on the indication. The CORESET monitoring manager1220may monitor the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode. Based on monitoring the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode, a processor of a UE115(e.g., controlling the receiver1110, the transmitter1140, or the transceiver1120as described with reference toFIG. 11) may efficiently receive a second indication of the subset of the first set of control resource sets. Further, the processor of UE115may identify the subset of the first set of control resource sets based at least in part on the second indication. The processor of the UE115may turn on one or more processing units for identifying the subset of the first set of control resource sets, increase a processing clock, or a similar mechanism within the UE115. As such, when the subset is identified, the processor may be ready to respond more efficiently through the reduction of a ramp up in processing power.

The transmitter1235may transmit signals generated by other components of the device1205. In some examples, the transmitter1235may be collocated with a receiver1210in a transceiver module. For example, the transmitter1235may be an example of aspects of the transceiver1420described with reference toFIG. 14. The transmitter1235may utilize a single antenna or a set of antennas.

FIG. 13shows a block diagram1300of a communications manager1305that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. The communications manager1305may be an example of aspects of a communications manager1115, a communications manager1215, or a communications manager1410described herein. The communications manager1305may include a CORESET monitoring manager1310, a TRP operation mode manager1315, a CORESET identifier1320, and a trigger signal manager1325. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The CORESET monitoring manager1310may monitor, in a multi-transmission-reception point operation mode, a first set of control resource sets for control information from a first transmission-reception point and a second set of control resource sets for control information from a second transmission-reception point. In some examples, the CORESET monitoring manager1310may monitor the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode. In some examples, the CORESET monitoring manager1310may identify and monitor the subset of the first set of control resource sets upon receiving the indication to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode.

In some examples, the CORESET monitoring manager1310may identify and monitor the subset of the first set of control resource sets upon receiving the indication to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode or identify and monitor the subset of the first set of control resource sets once a configured duration of time has expired after receiving the indication to transition from the multi-transmission-reception point. In some examples, the CORESET monitoring manager1310may identify and monitor the subset of the first set of control resource sets upon receiving the triggering signal.

The TRP operation mode manager1315may receive an indication to transition from the multi-transmission-reception point operation mode to a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode. In some examples, the TRP operation mode manager1315may receive another indication to transition back from the single-transmission-reception point operation mode to the multi-transmission-reception point operation mode.

The CORESET identifier1320may identify a subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on the indication. In some examples, the CORESET identifier1320may receive a second indication of the subset of the first set of control resource sets. In some examples, the CORESET identifier1320may identify the subset of the first set of control resource sets based on the second indication. In some examples, the CORESET identifier1320may receive an indication of control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets. In some examples, the CORESET identifier1320may receive a predefined garbage value in a transmission configuration indication field that corresponds to each of the control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets.

In some examples, the CORESET identifier1320may identify the subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on a predefined rule. In some examples, the CORESET identifier1320may identify a number of control resource sets corresponding to the control resource set limit for the single-transmission-reception point operation mode. In some examples, the CORESET identifier1320may select the number of control resource sets having the lowest set of indices from the first set of control resource sets. In some examples, the CORESET identifier1320may identify the subset of the first set of control resource sets based on the selecting, where the subset of the first set of control resource sets includes the number of control resource sets having the lowest set of indices from the first set of control resource sets.

In some examples, the CORESET identifier1320may receive a third indication of the first set of control resource sets to monitor for control information from the first transmission-reception point after transitioning back to the multi-transmission-reception point operation mode. In some examples, the CORESET identifier1320may identify the first set of control resource sets to monitor for control information from the first transmission-reception point after transitioning back to the multi-transmission-reception point operation mode based on a predefined rule. In some cases, the first indication and the second indication are received in a radio resource control message. In some cases, the first indication and the second indication are received in a MAC-CE or a DCI message. In some cases, the single-transmission-reception point operation mode includes a temporary single-transmission-reception point operation mode in a radio resource control configured multi-transmission-reception point operation mode. The trigger signal manager1325may receive a triggering signal to trigger the transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode.

FIG. 14shows a diagram of a system1400including a device1405that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. The device1405may be an example of or include the components of device1105, device1205, or a UE115as described herein. The device1405may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager1410, an I/O controller1415, a transceiver1420, an antenna1425, memory1430, and a processor1440. These components may be in electronic communication via one or more buses (e.g., bus1445).

The communications manager1410may monitor, in a multi-transmission-reception point operation mode, a first set of control resource sets for control information from a first transmission-reception point and a second set of control resource sets for control information from a second transmission-reception point, receive an indication to transition from the multi-transmission-reception point operation mode to a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, identify a subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on the indication, and monitor the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode.

The I/O controller1415may manage input and output signals for the device1405. The I/O controller1415may also manage peripherals not integrated into the device1405. In some cases, the I/O controller1415may represent a physical connection or port to an external peripheral. In some cases, the I/O controller1415may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. In other cases, the I/O controller1415may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller1415may be implemented as part of a processor. In some cases, a user may interact with the device1405via the I/O controller1415or via hardware components controlled by the I/O controller1415.

In some cases, the wireless device may include a single antenna1425. However, in some cases, the device may have more than one antenna1425, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory1430may include read-only memory (RAM) and random-access memory (ROM). The memory1430may store computer-readable, computer-executable code1435including instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory1430may contain, among other things, a basic input/basic output system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The code1435may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code1435may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code1435may not be directly executable by the processor1440but may cause a computer (e.g., when compiled and executed) to perform functions described herein.

FIG. 15shows a block diagram1500of a device1505that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. The device1505may be an example of aspects of a base station105as described herein. The device1505may include a receiver1510, a communications manager1515, and a transmitter1520. The device1505may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The receiver1510may 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 CORESET determination for multiple TRP configurations). Information may be passed on to other components of the device1505. The receiver1510may be an example of aspects of the transceiver1820described with reference toFIG. 18. The receiver1510may utilize a single antenna or a set of antennas.

The communications manager1515may transmit, to a UE operating in a multi-transmission-reception point operation mode, control information on a first set of control resource sets using a first transmission-reception point and control information on a second set of control resource sets using a second transmission-reception point, identify a subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the UE using the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, transmit, to the UE, an indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode, and transmit, to the UE, control information on the subset of the first set of control resource sets after the UE transitions to the single-transmission-reception point. The communications manager1515may be an example of aspects of the communications manager1810described herein.

The transmitter1520may transmit signals generated by other components of the device1505. In some examples, the transmitter1520may be collocated with a receiver1510in a transceiver module. For example, the transmitter1520may be an example of aspects of the transceiver1820described with reference toFIG. 18. The transmitter1520may utilize a single antenna or a set of antennas.

FIG. 16shows a block diagram1600of a device1605that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. The device1605may be an example of aspects of a device1505, or a base station105as described herein. The device1605may include a receiver1610, a communications manager1615, and a transmitter1635. The device1605may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The receiver1610may 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 CORESET determination for multiple TRP configurations). Information may be passed on to other components of the device1605. The receiver1610may be an example of aspects of the transceiver1820described with reference toFIG. 18. The receiver1610may utilize a single antenna or a set of antennas.

The communications manager1615may be an example of aspects of the communications manager1515as described herein. The communications manager1615may include a control information manager1620, a CORESET identifier1625, and a TRP operation mode manager1630. The communications manager1615may be an example of aspects of the communications manager1810described herein.

The control information manager1620may transmit, to a UE operating in a multi-transmission-reception point operation mode, control information on a first set of control resource sets using a first transmission-reception point and control information on a second set of control resource sets using a second transmission-reception point. The CORESET identifier1625may identify a subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the UE using the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode. The TRP operation mode manager1630may transmit, to the UE, an indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode. The control information manager1620may transmit, to the UE, control information on the subset of the first set of control resource sets after the UE transitions to the single-transmission-reception point.

The transmitter1635may transmit signals generated by other components of the device1605. In some examples, the transmitter1635may be collocated with a receiver1610in a transceiver module. For example, the transmitter1635may be an example of aspects of the transceiver1820described with reference toFIG. 18. The transmitter1635may utilize a single antenna or a set of antennas.

FIG. 17shows a block diagram1700of a communications manager1705that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. The communications manager1705may be an example of aspects of a communications manager1515, a communications manager1615, or a communications manager1810described herein. The communications manager1705may include a control information manager1710, a CORESET identifier1715, a TRP operation mode manager1720, a CORESET manager1725, and a trigger signal manager1730. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The control information manager1710may transmit, to a UE operating in a multi-transmission-reception point operation mode, control information on a first set of control resource sets using a first transmission-reception point and control information on a second set of control resource sets using a second transmission-reception point. In some examples, the control information manager1710may transmit, to the UE, control information on the subset of the first set of control resource sets after the UE transitions to the single-transmission-reception point. The CORESET identifier1715may identify a subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the UE using the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode.

In some examples, the CORESET identifier1715may identify the subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in the single-transmission-reception point operation mode based on a predefined rule. In some examples, the CORESET identifier1715may identify a number of control resource sets corresponding to the control resource set limit for the single-transmission-reception point operation mode. In some examples, the CORESET identifier1715may select the number of control resource sets having the lowest set of indices from the first set of control resource sets. In some examples, the CORESET identifier1715may identify the subset of the first set of control resource sets based on the selecting, where the subset of the first set of control resource sets includes the number of control resource sets having the lowest set of indices from the first set of control resource sets.

In some examples, the CORESET identifier1715may identify the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point after the UE transitions back to the multi-transmission-reception point operation mode based on a predefined rule. The TRP operation mode manager1720may transmit, to the UE, an indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode. In some examples, the TRP operation mode manager1720may transmit the indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode using the first transmission-reception point or the second transmission reception point.

In some examples, the TRP operation mode manager1720may transmit the indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode using the second transmission-reception point. In some examples, the TRP operation mode manager1720may transmit another indication for the UE to transition back from the single-transmission-reception point operation mode to the multi-transmission-reception point operation mode. The CORESET manager1725may transmit a second indication of the subset of the first set of control resource sets. In some examples, the CORESET manager1725may transmit an indication of control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets.

In some examples, the CORESET manager1725may transmit a predefined garbage value in a transmission configuration indication field that corresponds to each of the control resource sets in the first set of control resource sets excluded from the subset of the first set of control resource sets. In some examples, the CORESET manager1725may transmit a third indication of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point after the UE transitions back to the multi-transmission-reception point operation mode. In some cases, the first indication and the second indication are transmitted in a radio resource control message. In some cases, the first indication and the second indication are transmitted in a MAC-CE or a DCI message. In some cases, the single-transmission-reception point operation mode includes a temporary single-transmission-reception point operation mode in a radio resource control configured multi-transmission-reception point operation mode. The trigger signal manager1730may transmit a triggering signal using the first transmission-reception point to trigger the transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode.

FIG. 18shows a diagram of a system1800including a device1805that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. The device1805may be an example of or include the components of device1505, device1605, or a base station105as described herein. The device1805may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager1810, a network communications manager1815, a transceiver1820, an antenna1825, memory1830, a processor1840, and an inter-station communications manager1845. These components may be in electronic communication via one or more buses (e.g., bus1850).

The communications manager1810may transmit, to a UE operating in a multi-transmission-reception point operation mode, control information on a first set of control resource sets using a first transmission-reception point and control information on a second set of control resource sets using a second transmission-reception point, identify a subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the UE using the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode, and transmit, to the UE, an indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode, and transmit, to the UE, control information on the subset of the first set of control resource sets after the UE transitions to the single-transmission-reception point.

In some cases, the wireless device may include a single antenna1825. However, in some cases, the device may have more than one antenna1825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory1830may include RAM, ROM, or a combination thereof. The memory1830may store computer-readable code1835including instructions that, when executed by a processor (e.g., the processor1840) cause the device to perform various functions described herein. In some cases, the memory1830may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor1840may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor1840may be configured to operate a memory array using a memory controller. In some cases, a memory controller may be integrated into processor1840. The processor1840may be configured to execute computer-readable instructions stored in a memory (e.g., the memory1830) to cause the device1805to perform various functions (e.g., functions or tasks supporting CORESET determination for multiple TRP configurations).

The code1835may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code1835may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code1835may not be directly executable by the processor1840but may cause a computer (e.g., when compiled and executed) to perform functions described herein.

FIG. 19shows a flowchart illustrating a method1900that supports CORESET determination for multiple TRP configurations 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 communications manager as described with reference toFIGS. 11 through 14. 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 monitor, in a multi-transmission-reception point operation mode, a first set of control resource sets for control information from a first transmission-reception point and a second set of control resource sets for control information from a second transmission-reception point. The operations of1905may be performed according to the methods described herein. In some examples, aspects of the operations of1905may be performed by a CORESET monitoring manager as described with reference toFIGS. 11 through 14.

At1910, the UE may receive an indication to transition from the multi-transmission-reception point operation mode to a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode. The operations of1910may be performed according to the methods described herein. In some examples, aspects of the operations of1910may be performed by a TRP operation mode manager as described with reference toFIGS. 11 through 14.

At1915, the UE may identify a subset of the first set of control resource sets to monitor for control information from the first transmission-reception point in the single-transmission-reception point operation mode based on the indication. The operations of1915may be performed according to the methods described herein. In some examples, aspects of the operations of1915may be performed by a CORESET identifier as described with reference toFIGS. 11 through 14.

At1920, the UE may monitor the subset of the first set of control resource sets for control information from the first transmission-reception point in the single-transmission-reception point operation mode. The operations of1920may be performed according to the methods described herein. In some examples, aspects of the operations of1920may be performed by a CORESET monitoring manager as described with reference toFIGS. 11 through 14.

FIG. 20shows a flowchart illustrating a method2000that supports CORESET determination for multiple TRP configurations in accordance with aspects of the present disclosure. The operations of method2000may be implemented by a base station105or its components as described herein. For example, the operations of method2000may be performed by a communications manager as described with reference toFIGS. 15 through 18. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally, or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.

At2005, the base station may transmit, to a UE operating in a multi-transmission-reception point operation mode, control information on a first set of control resource sets using a first transmission-reception point and control information on a second set of control resource sets using a second transmission-reception point. The operations of2005may be performed according to the methods described herein. In some examples, aspects of the operations of2005may be performed by a control information manager as described with reference toFIGS. 15 through 18.

At2010, the base station may identify a subset of the first set of control resource sets on which to transmit control information to the UE using the first transmission-reception point when the UE is in a single-transmission-reception point operation mode, where the single-transmission-reception point operation mode is associated with communicating with the UE using the first transmission-reception point, and where a number of control resource sets in the first set of control resource sets exceeds a control resource set limit for the single-transmission-reception point operation mode. The operations of2010may be performed according to the methods described herein. In some examples, aspects of the operations of2010may be performed by a CORESET identifier as described with reference toFIGS. 15 through 18.

At2015, the base station may transmit, to the UE, an indication for the UE to transition from the multi-transmission-reception point operation mode to the single-transmission-reception point operation mode. The operations of2015may be performed according to the methods described herein. In some examples, aspects of the operations of2015may be performed by a TRP operation mode manager as described with reference toFIGS. 15 through 18.

At2020, the base station may transmit, to the UE, control information on the subset of the first set of control resource sets after the UE transitions to the single-transmission-reception point. The operations of2020may be performed according to the methods described herein. In some examples, aspects of the operations of2020may be performed by a control information manager as described with reference toFIGS. 15 through 18.