Discontinuous reception wake-up procedure with fast beam management
A user equipment (UE) may provide feedback regarding beam pairs used for wake-up signal (WUS) transmissions via uplink resources configured for WUS-based beam management feedback. A correspondence between WUSs and uplink resources for feedback may be semi-statically configured via radio resource control (RRC) signaling, may be dynamically indicated by each WUS, etc. In some examples, uplink resources for different UEs may be distinctive (e.g., UE-specific). In some cases, each beam used to transmit the wake-up message (e.g., each WUS) may have separate uplink resources, or all beams may share the same uplink resource (e.g., or some combination of uplink resources). As such, the UE and base station may identify one or more beams of sufficient quality (e.g., for control channel transmissions during a discontinuous reception (DRX) on-duration) based on the feedback (e.g., beam report) conveyed by the UE via the configured uplink resources for WUS-based fast beam management techniques.
1. A method for wireless communication at a user equipment (UE), comprising:
monitoring, in a connected mode during discontinuous reception operation, a wake-up signal occasion using receive beams corresponding to one or more configured beam pairs, the wake-up signal occasion occurring prior to or within a discontinuous reception on-duration;
detecting a wake-up message via a first receive beam corresponding to a first configured beam pair of the one or more configured beam pairs based at least in part on the monitoring;
selecting, based at least in part on the wake-up message, a first uplink resource from among a set of uplink resources prior to or within the discontinuous reception on-duration, each of the one or more configured beam pairs being associated with a corresponding uplink resource of the set of uplink resources, wherein the first uplink resource is configured for transmitting feedback for the first configured beam pair; and
transmitting, using the first uplink resource, a beam report for the one or more configured beam pairs based at least in part on detecting the wake-up message, wherein the beam report comprises feedback for the first receive beam.
2. The method of claim 1 , further comprising:
receiving an indication of a correspondence between the wake-up message and at least the first uplink resource from among the set of uplink resources.
3. The method of claim 1 , further comprising:
identifying a correspondence between the wake-up message and at least the first uplink resource from among the set of uplink resources based at least in part on the detected wake-up message.
4. The method of claim 1 , wherein transmitting the beam report comprises:
transmitting an acknowledgement or a received signal power value for the detected wake-up message using the uplink resources.
5. The method of claim 1 , wherein the wake-up message comprises a plurality of wake-up messages and the set of uplink resources comprises a plurality of uplink resources, each of the plurality of uplink resources corresponding to one wake-up message of the plurality of wake-up messages.
6. The method of claim 1 , wherein the wake-up message comprises a plurality of wake-up messages and the set of uplink resources comprise a single uplink resource corresponding to the plurality of wake-up messages.
7. The method of claim 6 , wherein transmitting the beam report comprises:
transmitting an index associated with the detected wake-up message.
8. The method of claim 1 , further comprising:
monitoring a physical downlink control channel during the discontinuous reception on-duration based at least in part on the wake-up message comprising a wake-up indication for the UE; and
receiving a downlink control channel transmission based at least in part on the monitoring.
9. The method of claim 1 , further comprising:
identifying the first configured beam pair of the one or more configured beam pairs based at least in part on the wake-up message;
monitoring a physical downlink control channel during the discontinuous reception on-duration using the first configured beam pair based at least in part on an indication associated with the first configured beam pair in the beam report; and
receiving a physical downlink data channel scheduled by the physical downlink control channel using the first configured beam pair based at least in part on the indication associated with the first configured beam pair in the beam report.
10. The method of claim 9 , wherein the monitoring the physical downlink control channel comprises monitoring a first control resource set of a plurality of control resource sets based at least in part on identifying the first configured beam pair.
11. The method of claim 9 , wherein the monitoring the physical downlink control channel comprises monitoring a first control resource set configured for a second configured beam pair according to the first configured beam pair based at least in part on identifying the first beam configured pair.
12. The method of claim 1 , further comprising:
determining to remain in a power-saving state during the discontinuous reception on-duration based at least in part on the wake-up message comprising an indication that mobile terminated data is not present for the UE.
13. A method for wireless communication at a base station, comprising:
identifying a group of user equipments (UEs) associated with a set of transmit beams corresponding to one or more configured beam pairs, the group of UEs operating according to discontinuous reception in a connected mode;
transmitting a set of wake-up messages during a wake-up signal occasion prior to or within discontinuous reception on-durations associated with the group of UEs, wherein each wake-up message of the set of wake-up messages is transmitted using a different transmit beam of the set of transmit beams;
identifying a set of uplink resources corresponding to the set of wake-up messages, each of the one or more configured beam pairs being associated with a corresponding uplink resource of the set of uplink resources, wherein each uplink resource of the set of uplink resources is configured for receiving feedback for at least one of the one or more configured beam pairs; and
receiving a beam report from at least one of the group of UEs over one or more uplink resources of the set of uplink resources based at least in part on the transmitted set of wake-up messages, wherein the beam report comprises feedback for at least one of the one or more configured beam pairs.
14. The method of claim 13 , further comprising:
transmitting an indication of a correspondence between the set of wake-up messages and the set of uplink resources.
15. The method of claim 13 , wherein a wake-up message of the set of wake-up messages includes an indication of a correspondence between the wake-up message and an uplink resource of the set of uplink resources.
16. The method of claim 13 , wherein receiving the beam report comprises:
receiving an acknowledgement or a received signal power value for one or more of the set of wake-up messages over the one or more uplink resources of the set of uplink resources.
17. The method of claim 13 , wherein the set of uplink resources comprise a plurality of uplink resources, each of the plurality of uplink resources corresponding to one wake-up message of the set of wake-up messages.
18. The method of claim 13 , wherein the set of uplink resources comprise a single uplink resource corresponding to the set of wake-up messages.
19. The method of claim 13 , further comprising:
identifying that one or more UEs of the group of UEs have downlink data buffered at the base station;
setting one or more wake-up indication bits in the set of wake-up messages based at least in part on the downlink data buffered at the base station for the one or more UEs; and
transmitting, in the discontinuous reception on-durations, a physical downlink control channel transmission to the one or more UEs based at least in part on setting the one or more wake-up indication bits.
20. The method of claim 13 , further comprising:
identifying that none of the group of UEs have downlink data buffered at the base station; and
setting wake-up indication bits in the set of wake-up messages to indicate no downlink data being present at the base station based at least in part on the identifying that none of the group of UEs have downlink data buffered at the base station.
21. The method of claim 13 , further comprising:
identifying, for a first UE of the group of UEs, a first transmit beam corresponding to a first configured beam pair of the one or more configured beam pairs based at least in part on the received beam report; and
transmitting, in the discontinuous reception on-durations, a physical downlink control channel transmission using the first transmit beam; and
transmitting a physical downlink data channel transmission using the first transmit beam, the physical downlink data channel transmission scheduled by the physical downlink control channel transmission.
22. The method of claim 21 , wherein:
transmitting the physical downlink control channel transmission comprises transmitting the physical downlink control channel transmission in a first control resource set associated with the first transmit beam.
23. The method of claim 21 , wherein:
transmitting the physical downlink control channel transmission comprises transmitting the physical downlink control channel transmission in a control resource set configured for a second transmit beam corresponding to a second configured beam pair of the one or more configured beam pairs.
24. 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, in a connected mode during discontinuous reception operation, a wake-up signal occasion using receive beams corresponding to one or more configured beam pairs, the wake-up signal occasion occurring prior to or within a discontinuous reception on-duration;
detect a wake-up message via a first receive beam corresponding to a first configured beam pair of the one or more configured beam pairs based at least in part on the monitoring;
select, based at least in part on the wake-up message, a first uplink resource from among a set of uplink resources prior to or within the discontinuous reception on-duration, each of the one or more configured beam pairs being associated with a corresponding uplink resource of the set of uplink resources, wherein the first uplink resource is configured for transmitting feedback for the first configured beam pair; and
transmit, using the first uplink resource, a beam report for the one or more configured beam pairs based at least in part on detecting the wake-up message, wherein the beam report comprises feedback for the first receive beam.
25. The apparatus of claim 24 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive an indication of a correspondence between the wake-up message and at least the first uplink resource from among the set of uplink resources.
26. The apparatus of claim 24 , wherein the instructions are further executable by the processor to cause the apparatus to:
identify a correspondence between the wake-up message and at least the first uplink resource from among the set of uplink resources based at least in part on the detected wake-up message.
27. The apparatus of claim 24 , wherein the instructions to transmit the beam report are executable by the processor to cause the apparatus to:
transmit an acknowledgement for the detected wake-up message using the uplink resources.
28. An apparatus for wireless communication at a base station, comprising: a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to:
identify a group of user equipments (UEs) associated with a set of transmit beams corresponding to one or more configured beam pairs, the group of UEs operating according to discontinuous reception in a connected mode;
transmit a set of wake-up messages during a wake-up signal occasion prior to or within discontinuous reception on-durations associated with the group of UEs, wherein each wake-up message of the set of wake-up messages is transmitted using a different transmit beam of the set of transmit beams;
identify a set of uplink resources corresponding to the set of wake-up messages, each of the one or more configured beam pairs being associated with a corresponding uplink resource of the set of uplink resources, wherein each uplink resource of the set of uplink resources is configured for receiving feedback for at least one of the one or more configured beam pairs; and
receive a beam report from at least one of the group of UEs over one or more uplink resources of the set of uplink resources based at least in part on the transmitted set of wake-up messages, wherein the beam report comprises feedback for at least one of the one or more configured beam pairs.
29. The apparatus of claim 28 , wherein the instructions are further executable by the processor to cause the apparatus to:
transmit an indication of a correspondence between the set of wake-up messages and the set of uplink resources.
30. The apparatus of claim 28 , wherein a wake-up message of the set of wake-up messages includes an indication of a correspondence between the wake-up message and an uplink resource of the set of uplink resources.