Aperiodic and cross component carrier positioning reference signals
Methods, systems, and devices for wireless communications are described. The described techniques relate to improved methods, systems, devices, and apparatuses that support aperiodic and cross component carrier positioning reference signals (PRSs). Generally, the described techniques provide for receiving a dynamic trigger indicating that a user equipment (UE) is to monitor for one or more downlink PRSs. The UE may generate a timing measurement for the downlink PRSs, and may transmit a measurement report that indicates the timing measurement to a transmission/reception point. A UE may also transmit a capability indicator, indicating that the UE is capable of maintaining phase coherence for a PRS that spans multiple component carriers, receive control signaling that indicates multiple component carries on which the PRS is phase coherent, generate a timing measurement for the PRS based on the control signaling, and transmit a measurement report that indicates the timing measurement to the transmission/reception point.
1. An apparatus for wireless communications by a user equipment (UE), comprising:
one or more transceivers;
one or more memory; and
one or more processors electronically coupled to the one or more memory and the one or more transceivers, the one or more processors configured to:
receive a dynamic trigger that is a medium access control (MAC) control element (CE), downlink control information, or both, the dynamic trigger indicating that the UE is to monitor for a downlink positioning reference signal from a transmission/reception point;
generate a timing measurement for the downlink positioning reference signal based at least in part on the dynamic trigger; and
transmit a measurement report that indicates the timing measurement.
2. The apparatus of claim 1 , wherein the processor is configured to:
receive the dynamic trigger that indicates to monitor for a respective downlink positioning reference signal from each transmission/reception point of a plurality of transmission/reception points.
3. The apparatus of claim 2 , wherein the processor is configured to:
generate a respective timing measurement for the respective downlink positioning reference signals, wherein the measurement report indicates at least one of the respective timing measurements.
4. The apparatus of claim 1 , wherein the processor is configured to:
receive the dynamic trigger that indicates a positioning reference signal occasion to monitor for the downlink positioning reference signal.
5. The apparatus of claim 4 , wherein the processor is configured to:
receive the dynamic trigger that indicates that a duration of the positioning reference signal occasion is at least one transmission time interval.
6. The apparatus of claim 5 , wherein each transmission time interval of the at least one transmission time interval is a symbol period, a mini-slot, or a slot.
7. The apparatus of claim 1 , wherein the processor is configured to:
receive the dynamic trigger that indicates a defined number of positioning reference signal occasions to monitor for the downlink positioning reference signal.
8. The apparatus of claim 7 , wherein the processor is configured to:
de-activate monitoring for the downlink positioning reference signal subsequent to a last positioning reference signal occasion of the defined number of positioning reference signal occasions.
9. The apparatus of claim 1 , wherein the processor is configured to:
transmit a trigger request to the transmission/reception point, wherein the dynamic trigger is received based at least in part on the trigger request.
10. The apparatus of claim 1 , wherein the processor is configured to:
receive the dynamic trigger that indicates a muting pattern; and
determine to monitor for the downlink positioning reference signal during a downlink positioning reference signal occasion based at least in part on the muting pattern.
11. The apparatus of claim 1 , wherein the processor is configured to:
receive the dynamic trigger that indicates a muting pattern; and
determine to skip monitoring for the downlink positioning reference signal during a downlink positioning reference signal occasion based at least in part on the muting pattern.
12. An apparatus for wireless communications by a transmission/reception point, comprising:
one or more transceivers;
one or more memory; and
one or more processors electronically coupled to the one or more memory and the one or more transceivers, the one or more processors configured to:
transmit a dynamic trigger that is a medium access control (MAC) control element (CE), downlink control information, or both, the dynamic trigger indicating that a user equipment (UE) is to monitor for a downlink positioning reference signal from a transmission/reception point; and
receive a measurement report that indicates a timing measurement for the downlink positioning reference signal.
13. The apparatus of claim 12 , wherein the processor is configured to:
transmit a downlink positioning reference signal configuration to a second transmission/reception point to coordinate transmission of the downlink positioning reference signal with transmission of a second downlink positioning reference signal by the second transmission/reception point.
14. The apparatus of claim 12 , wherein the processor is configured to:
transmit the dynamic trigger that indicates to monitor for a respective downlink positioning reference signal from each transmission/reception point of a plurality of transmission/reception points.
15. The apparatus of claim 12 , wherein the processor is configured to:
transmit the dynamic trigger that indicates a positioning reference signal occasion to monitor for the downlink positioning reference signal.
16. The apparatus of claim 12 , wherein the processor is configured to:
transmit the dynamic trigger that indicates a defined number of positioning reference signal occasions to monitor for the downlink positioning reference signal.
17. The apparatus of claim 12 , wherein the processor is configured to:
receive a trigger request from the UE, wherein the dynamic trigger is transmitted based at least in part on the trigger request.