Signaling of UE intra/inter-panel beam switch latency
Certain aspects of the present disclosure relate to methods and apparatus for signaling of UE intra/inter-panel beam switch latency using communications systems operating according to new radio (NR) technologies. For example, the method generally includes determining at least a first latency associated with a beam switch across at least first and second antenna array modules, wherein the first latency is greater than or equal to a second latency associated with a beam switch within the first or second antenna module, and signaling a second device an indication of when to assume the first latency for a beam switch at the first device.
1. A method for wireless communications by a first device, comprising:
transmitting, from the first device to a second device, a first indication of first device's capability associated with beam switch latency, wherein the first indication includes a first beam switch latency;
receiving, from the second device, a second indication triggering communication of one or more reference signals, wherein the second indication comprises a downlink control information (DCI), and the one or more reference signals comprise one or more aperiodic channel state information reference signals (A-CSI-RSs); and
receiving, from the second device, the one or more reference signals after receiving the second indication, wherein a delay between receiving the second indication and the one or more reference signals is based on the first beam switch latency, wherein the first beam switch latency indicates a delay between the DCI and the one or more A-CSI-RSs.
2. The method of claim 1 , wherein the first device includes a user equipment (UE), and wherein the second device includes a base station (BS).
3. The method of claim 1 , wherein
the beam switch includes reception beam switch in downlink receiving signal from the second device, or
the beam switch includes transmission beam switch in uplink transmitting signal to the second device.
4. The method of claim 1 , wherein the received one or more A-CSI-RSs are part of a P3 beam management.
5. The method of claim 4 , wherein the received one or more A-CSI-RSs scheduled by the DCI.
6. The method of claim 4 , wherein the first beam switch latency is fixed beam switch latency.
7. The method of claim 4 , wherein the first beam switch latency is configurable beam switch latency.
8. The method of claim 5 , wherein:
the second device configures the first device with a plurality of active TCI states; and each PDSCH beam is determined based on an active TCI state.
9. A method for wireless communications by a second device, comprising:
receiving, from a first device, a first indication of first device's capability associated with beam switch latency, wherein the first indication includes a first beam switch latency;
transmitting, from the second device to the first device, a second indication triggering communication of one or more reference signals, wherein the second indication comprises a downlink control information (DCI), and the one or more reference signals comprise one or more aperiodic channel state information reference signals (A-CSI-RSs); and
transmitting, from the second device to the first device, the one or more reference signals after transmitting the second indication, wherein a delay between transmitting the second indication and the one or more reference signals is based on the first beam switch latency, wherein the first beam switch latency indicates a delay between the DCI and the one or more A-CSI-RSs.
10. The method of claim 9 , wherein the first device includes a user equipment (UE), and wherein the second device includes a base station (BS).
11. The method of claim 9 , wherein:
the beam switch includes reception beam switch in downlink receiving signal from the second device, or
the beam switch includes transmission beam switch in uplink transmitting signal to the second device.
12. The method of claim 9 , wherein the transmitted one or more A-CSI-RSs are part of a P3 beam management.
13. The method of claim 12 , wherein the transmitted one or more A-CSI-RSs scheduled by the DCI.
14. The method of claim 12 , wherein the first beam switch latency is fixed beam switch latency.
15. The method of claim 12 , wherein the first beam switch latency is configurable beam switch latency.
16. An apparatus for wireless communications by a first device, comprising:
at least one processor configured to:
transmit, from the first device to a second device, a first indication of first device's capability associated with beam switch latency, wherein the first indication includes a first beam switch latency;
receive, from the second device, a second indication triggering communication of one or more reference signals, wherein the second indication comprises a downlink control information (DCI), and the one or more reference signals comprise one or more aperiodic channel state information reference signals (A-CSI-RSs); and
receive, from the second device, the one or more reference signals after receiving the second indication, wherein a delay between receiving the second indication and the one or more reference signals is based on the first beam switch latency, wherein the first beam switch latency indicates a delay between the DCI and the one or more A-CSI-RSs; and
a memory coupled to the at least one processor.
17. An apparatus for wireless communications by a second device, comprising:
at least one processor configured to:
receive, from a first device, a first indication of first device's capability associated with beam switch latency, wherein the first indication includes a first beam switch latency;
transmit, from the second device to the first device, a second indication triggering communication of one or more reference signals, wherein the second indication comprises a downlink control information (DCI), and the one or more reference signals comprise one or more aperiodic channel state information reference signals (A-CSI-RSs); and
transmit, from the second device to the first device, the one or more reference signals after transmitting the second indication, wherein a delay between transmitting the second indication and the one or more reference signals is based on the first beam switch latency, wherein the first beam switch latency indicates a delay between the DCI and the one or more A-CSI-RSs; and
a memory coupled to the at least one processor.
18. The apparatus of claim 16 , wherein the first device includes a user equipment (UE), and wherein the second device includes a base station (BS).
19. The apparatus of claim 16 , wherein
the beam switch includes reception beam switch in downlink receiving signal from the second device, or
the beam switch includes transmission beam switch in uplink transmitting signal to the second device.
20. The apparatus of claim 16 , wherein the received one or more A-CSI-RSs are part of a P3 beam management.
21. The apparatus of claim 20 , wherein the received one or more A-CSI-RSs scheduled by the DCI.
22. The apparatus of claim 20 , wherein the first beam switch latency is fixed beam switch latency.
23. The apparatus of claim 20 , wherein the first beam switch latency is configurable beam switch latency.
24. The apparatus of claim 17 , wherein the first device includes a user equipment (UE), and wherein the second device includes a base station (BS).
25. The apparatus of claim 17 , wherein
the beam switch includes reception beam switch in downlink receiving signal from the second device, or
the beam switch includes transmission beam switch in uplink transmitting signal to the second device.
26. The apparatus of claim 17 , wherein the received one or more A-CSI-RSs are part of a P3 beam management.
27. The apparatus of claim 26 , wherein the received one or more A-CSI-RSs scheduled by the DCI.
28. The apparatus of claim 26 , wherein the first beam switch latency is fixed beam switch latency.
29. The apparatus of claim 26 , wherein the first beam switch latency is configurable beam switch latency.