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1. (WO2019032886) BEAM MANAGEMENT FOR BEAM-SWEPT WAKEUP SIGNALS
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CLAIMS

What is claimed is:

1. A method for wireless communication at a user equipment (UE), comprising:

receiving, from a base station while operating in a discontinuous reception (DRX) mode, a first set of signals in a first set of transmit beams and a second set of signals in a second set of transmit beams, wherein the first set of signals comprise reference signals or synchronization signals, or a combination thereof;

selecting the second set of transmit beams based at least in part on the received first set of signals, the second set of transmit beams comprising two or more transmit beams, and the two or more transmit beams being different from the first set of transmit beams; and transmitting an indication of the selected second set of transmit beams to the base station.

2. The method of claim 1, further comprising:

receiving a wakeup signal from the base station, the wakeup signal received using at least one transmit beam of the second set of transmit beams; and

waking up from a sleep state of the DRX mode to receive data based at least in part on the received wakeup signal.

3. The method of claim 2, wherein the wakeup signal comprises a narrowband tone, or a UE-specific reference signal, or a physical downlink control channel (PDCCH) including a plurality of cyclic redundancy check (CRC) bits scrambled by a C-RNTI of the UE, or a combination thereof.

4. The method of claim 1, further comprising:

determining a signal quality associated with the received first set of signals, wherein selecting the second set of transmit beams is based on a signal quality threshold.

5. The method of claim 1, wherein transmitting the indication of the selected second set of transmit beams comprises:

transmitting a beam recovery signal that identifies the selected second set of transmit beams.

6. The method of claim 1, wherein:

the reference signals comprise demodulation reference signals (DMRSs), tracking reference signals (TRSs), phase compensation reference signals (PC-RSs), or channel state information reference signals (CSI-RSs), or a combination thereof; and

the synchronization signals comprise primary synchronization signals (PSSs), secondary synchronization signals (SSSs), demodulation reference signals (DMRSs), physical broadcast channel (PBCH) signals, or a combination thereof.

7. The method of claim 1, wherein the DRX mode comprises a connected DRX (C-DRX) mode.

8. A method for wireless communication at a user equipment (UE), comprising:

receiving, while operating in a discontinuous reception (DRX) mode, a wakeup signal to wake the UE from a sleep state of the DRX mode, the wakeup signal transmitted by a base station using a first transmit beam and a second transmit beam of a first set of transmit beams in accordance with a beam sweeping configuration;

receiving, based at least in part on receiving the wakeup signal, a set of signals transmitted by the base station using a second set of transmit beams, the set of signals comprising reference signals, or synchronization signals, or a combination thereof;

selecting a transmit beam from the second set of transmit beams for the UE to use to receive downlink transmissions from the base station; and

transmitting an indication of the selected transmit beam to the base station.

9. The method of claim 8, further comprising:

decoding the set of signals, wherein the set of signals are encoded using a code rate that is higher than a code rate used to encode the wakeup signal; and

determining a signal quality associated with the decoded set of signals, wherein selecting the transmit beam is based on a signal quality threshold.

10. The method of claim 8, further comprising:

receiving, as part of the wakeup signal, at least a part of a beam management configuration used to select the transmit beam from the second set of transmit beams.

11. The method of claim 8, further comprising:

receiving the downlink transmissions transmitted by the base station using the selected transmit beam, wherein the downlink transmissions comprise a physical downlink control channel (PDCCH), or a resource grant, or downlink data, or a combination thereof.

12. The method of claim 8, wherein:

the reference signals comprise demodulation reference signals (DMRSs), tracking reference signals (TRSs), phase compensation reference signals (PC-RSs), or channel state information reference signals (CSI-RSs), or a combination thereof; and

the synchronization signals comprise primary synchronization signals (PSSs), secondary synchronization signals (SSSs), demodulation reference signals (DMRSs), physical broadcast channel (PBCH) signals, or a combination thereof.

13. A method for wireless communication at a base station, comprising: identifying that data is available to be transmitted to a user equipment (UE) that is operating in a discontinuous reception (DRX) mode; and

transmitting, to the UE, a wakeup signal to wake the UE from a sleep state of the DRX mode, the wakeup signal transmitted using a first transmit beam and a second transmit beam of a first set of transmit beams in accordance with a beam sweeping configuration.

14. The method of claim 13, further comprising:

configuring the UE to monitor the first set of transmit beams to receive a set of signals from the base station while operating in the DRX mode, the set of signals comprising reference signals, or synchronization signals, or a combination thereof.

15. The method of claim 14, further comprising:

receiving, from the UE, an indication of a second set of transmit beams comprising a plurality of transmit beams selected by the UE based at least in part on the set of signals, wherein transmitting the wakeup signal comprises:

transmitting the wakeup signal using the plurality of transmit beams of the second set of transmit beams based at least in part on the received indication.

16. The method of claim 15, wherein each of the second set of transmit beams is different from each of the first set of transmit beams.

17. The method of claim 15, further comprising:

configuring the UE to transmit the indication of the second set of transmit beams at a predetermined periodicity.

18. The method of claim 15, further comprising:

determining a link quality threshold to decode the wakeup signal; and configuring the UE to transmit the indication of the second set of transmit beams when a link quality of the first transmit beam or the second transmit beam of the first set of transmit beams fails to satisfy the determined link quality threshold.

19. The method of claim 15, wherein receiving the indication of the second set of transmit beams comprises: receiving a beam recovery signal that identifies the second set of transmit beams.

20. The method of claim 14, wherein:

the reference signals comprise demodulation reference signals (DMRSs), tracking reference signals (TRSs), phase compensation reference signals (PC-RSs), or channel state information reference signals (CSI-RSs), or a combination thereof; and

the synchronization signals comprise primary synchronization signals (PSSs), secondary synchronization signals (SSSs), demodulation reference signals (DMRSs), physical broadcast channel (PBCH) signals, or a combination thereof.

21. The method of claim 13, further comprising:

configuring the UE to monitor the first set of transmit beams to receive a set of signals from the base station while operating in the DRX mode, the set of signals comprising reference signals, or synchronization signals, or a combination thereof; and

transmitting the set of signals using the first set of transmit beams in accordance with the beam sweeping configuration.

22. The method of claim 13, wherein the first transmit beam, or the second transmit beam, or both, are a pseudo-omni beam.

23. The method of claim 13, wherein the wakeup signal comprises a narrowband tone, or a UE-specific reference signal, or a physical downlink control channel (PDCCH) including a plurality of cyclic redundancy check (CRC) bits scrambled by a C-RNTI of the UE, or a combination thereof.

24. A method for wireless communication at a user equipment (UE), comprising:

receiving, from a base station, a first set of signals in a first set of transmit beams and a second set of signals in a second set of transmit beams, wherein the first set of signals comprise reference signals, or synchronization signals, or a combination thereof;

selecting a transmit beam from the second set of transmit beams based at least in part on the received first set of signals; and

transmitting an indication of the selected transmit beam from the second set of transmit beams to the base station.

25. The method of claim 24, wherein transmitting the indication of the selected transmit beam comprises transmitting a beam recovery signal that identifies the selected transmit beam.

26. The method of claim 24, further comprising:

determining, for each transmit beam of the first set of transmit beams, a signal quality associated with the received first set of signals, wherein the transmit beam is selected based on the signal quality being below a signal quality threshold.

27. The method of claim 24, further comprising:

receiving, using the selected transmit beam from the second set of transmit beams, signals from the base station in response to the transmitted indication.

28. The method of claim 24, wherein:

the reference signals comprise demodulation reference signals (DMRSs), tracking reference signals (TRSs), phase compensation reference signals (PC-RSs), or channel state information reference signals (CSI-RSs), or a combination thereof; and

the synchronization signals comprise primary synchronization signals (PSSs), secondary synchronization signals (SSSs), demodulation reference signals (DMRSs), physical broadcast channel (PBCH) signals, or a combination thereof.

29. The method of claim 24, wherein the first set of signals comprise channel state information reference signals (CSI-RSs), the method further comprising:

receiving a configuration of periodic CSI-RS resources; and

receiving at least one of the CSI-RSs during a CSI-RS resource of the periodic CSI-RS resources.

30. The method of claim 29, further comprising:

determining that a signal quality associated with the received at least one CSI-RS is below a signal quality threshold, wherein selecting the second set of transmit beams is based at least in part on the determination; and

receiving a signal from the base station using at least one transmit beam of the second set of transmit beams based at least in part on the determination.