Techniques for switching control channel monitoring for multi-transmission/reception point
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may operate in a multi-transmission/reception point (TRP) mode, where the multi-TRP mode includes monitoring a plurality of control channels and where each of the plurality of control channels may be associated with a TRP. The UE may operate in a first control channel monitoring state of the multi-TRP mode, where the UE may be configured to monitor a first control channel of a first TRP. The UE may identify an indication to switch from the first control channel monitoring state to a second control channel monitoring state of the multi-TRP mode. The UE may switch, based on the indication, to the second control channel monitoring state, where the UE may be configured to monitor the first control channel of the first TRP and monitor a second control channel of the second TRP.
1. A method for wireless communication at a user equipment (UE), comprising:
monitoring a first control channel of a first transmission/reception point;
receiving, from the first transmission/reception point, a bandwidth part switching downlink control information indicating to switch from monitoring the first control channel of the first transmission/reception point to monitoring the first control channel of the first transmission/reception point and a second control channel of a second transmission/reception point; and
monitoring, based at least in part on receiving the bandwidth part switching downlink control information, the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point.
2. The method of claim 1 , further comprising:
transmitting, based at least in part on switching from monitoring the first control channel of the first transmission/reception point to monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point, an acknowledgement/negative-acknowledgement (ACK/NACK) signal to the first transmission/reception point and the second transmission/reception point indicating that the UE has switched to monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point.
3. The method of claim 1 , further comprising:
identifying a subsequent indication to switch from monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point to monitoring the first control channel of the first transmission/reception point; and
switching, based at least in part on the subsequent indication, from monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point to monitoring the first control channel of the first transmission/reception point.
4. The method of claim 3 , wherein identifying the subsequent indication comprises:
receiving, from the first transmission/reception point or the second transmission/reception point, at least one of a downlink control information (DCI) signal, a medium access control (MAC) control element (CE) signal, or a combination thereof, indicating for the UE to switch to monitoring the first control channel of the first transmission/reception point.
5. The method of claim 3 , wherein identifying the subsequent indication comprises:
initiating, upon switching to monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point, a timer associated with monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point; and
switching, upon expiry of the timer, to monitoring the first control channel of the first transmission/reception point.
6. The method of claim 5 , further comprising:
receiving, from the first transmission/reception point, the second transmission/reception point, or a combination thereof, at least one of a downlink control information (DCI), a medium access control (MAC) control element (CE), a radio resource control (RRC) signal, or a combination thereof, indicating a duration of the timer.
7. A method for wireless communication at a first transmission/reception point, comprising:
communicating with a user equipment (UE) via a first control channel while the UE is configured to monitor the first control channel of the first transmission/reception point;
transmitting a bandwidth part switching downlink control information to the UE indicating that the UE is to switch from monitoring the first control channel of the first transmission/reception point to monitoring the first control channel of the first transmission/reception point and a second control channel of a second transmission/reception point; and
communicating, based at least in part on transmitting the bandwidth part switching downlink control information, with the UE via the first control channel while the UE is configured to monitor the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point.
8. The method of claim 7 , further comprising:
receiving, from the UE and while the UE is configured to monitor the first control channel of the first transmission/reception point, a channel performance measurement report indicating a result of a channel performance measurement using one or more signals from the first transmission/reception point.
9. The method of claim 7 , further comprising:
transmitting an indication of a timer duration for a timer associated with monitoring the first control channel of the first transmission/reception point, monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point, or a combination thereof.
10. The method of claim 7 , further comprising:
receiving an acknowledgement/negative-acknowledgement (ACK/NACK) signal from the UE indicating that the UE has switched to monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point.
11. The method of claim 7 , further comprising:
transmitting, to the UE, a subsequent indication comprising at least one of a downlink control information (DCI) signal, a medium access control (MAC) control element (CE) signal, or a combination thereof, indicating for the UE to switch from monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point to monitoring the first control channel of the first transmission/reception point.
12. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
monitor a first control channel of a first transmission/reception point;
receive, from the first transmission/reception point, a bandwidth part switching downlink control information indicating to switch from monitoring the first control channel of the first transmission/reception point to monitoring the first control channel of the first transmission/reception point and a second control channel of a second transmission/reception point; and
monitor, based at least in part on receiving the bandwidth part switching downlink control information, the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point.
13. The apparatus of claim 12 , wherein the instructions are further executable by the processor to cause the apparatus to:
transmit, based at least in part on switching from monitoring the first control channel of the first transmission/reception point to monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point, an acknowledgement/negative-acknowledgement (ACK/NACK) signal to the first transmission/reception point and the second transmission/reception point indicating that the UE has switched to monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point.
14. The apparatus of claim 12 , wherein the instructions are further executable by the processor to cause the apparatus to:
identify a subsequent indication to switch from monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point to monitoring the first control channel of the first transmission/reception point; and
switch, based at least in part on the subsequent indication, from monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point to monitoring the first control channel of the first transmission/reception point.
15. The apparatus of claim 14 , wherein the instructions to identify the subsequent indication are executable by the processor to cause the apparatus to:
receive, from the first transmission/reception point or the second transmission/reception point, at least one of a downlink control information (DCI) signal, a medium access control (MAC) control element (CE) signal, or a combination thereof, indicating for the UE to switch to monitoring the first control channel of the first transmission/reception point.
16. The apparatus of claim 14 , wherein the instructions to identify the subsequent indication are executable by the processor to cause the apparatus to:
initiate, upon switching to monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point, a timer associated with monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point; and
switch, upon expiry of the timer, to monitoring the first control channel of the first transmission/reception point.
17. The apparatus of claim 16 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive, from the first transmission/reception point, the second transmission/reception point, or a combination thereof, at least one of a downlink control information (DCI), a medium access control (MAC) control element (CE), a radio resource control (RRC) signal, or a combination thereof, indicating a duration of the timer.
18. An apparatus for wireless communication at a first transmission/reception point, comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
communicate with a user equipment (UE) via a first control channel while the UE is configured to monitor the first control channel of the first transmission/reception point;
transmit a bandwidth part switching downlink control information to the UE indicating that the UE is to switch from monitoring the first control channel of the first transmission/reception point to monitoring the first control channel of the first transmission/reception point and a second control channel of a second transmission/reception point; and
communicate, based at least in part on transmitting the bandwidth part switching downlink control information, with the UE via the first control channel while the UE is configured to monitor the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point.
19. The apparatus of claim 18 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive, from the UE and while the UE is configured to monitor the first control channel of the first transmission/reception point, a channel performance measurement report indicating a result of a channel performance measurement using one or more signals from the first transmission/reception point.
20. The apparatus of claim 18 , wherein the instructions are further executable by the processor to cause the apparatus to:
transmit an indication of a timer duration for a timer associated with monitoring the first control channel of the first transmission/reception point, monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point, or a combination thereof.
21. The apparatus of claim 18 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive an acknowledgement/negative-acknowledgement (ACK/NACK) signal from the UE indicating that the UE has switched to monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point.
22. The apparatus of claim 18 , wherein the instructions are further executable by the processor to cause the apparatus to:
transmit, to the UE, a subsequent indication comprising at least one of a downlink control information (DCI) signal, a medium access control (MAC) control element (CE) signal, or a combination thereof, indicating for the UE to switch from monitoring the first control channel of the first transmission/reception point and the second control channel of the second transmission/reception point to monitoring the first control channel of the first transmission/reception point.