Wakeup signaling resource occasions
View Patent ↗Methods, systems, and devices for wireless communications are described. Some wireless communications systems support user equipment (UEs) achieving power savings by operating in a connected discontinuous reception (C-DRX) mode. The systems may additionally utilize wakeup signals for further power savings at a UE. For example, a UE may be configured with a wakeup signal resource configuration (e.g., a first search space configuration) for monitoring for wakeup signals while operating in a low power mode. This first search space configuration may be different from a second search space configuration for the UE operating in an active mode. When in a low power mode, the UE may monitor for wakeup signals according to the wakeup signal resource configuration. If the UE receives a wakeup signal in a wakeup signal resource defined by the configuration, the UE may initiate a wakeup procedure and transition to the active mode for data transmission and reception.
1. An apparatus for wireless communications at a user equipment (UE), comprising:
one or more processors;
one or more memories coupled with the one or more processors; and
instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to:
receive, using a first receiver, control signaling indicating a configuration that configures the UE to monitor, via a plurality of wakeup signal resources, for one or more sequences for initiating a wakeup procedure,
wherein the UE refrains from monitoring for the one or more sequence according to the configuration based at least in part on the UE operating in an active mode; and
monitor, using a second receiver associated with a wakeup subsystem of the UE based at least in part on the UE operating outside the active mode, for the one or more sequences via the plurality of wakeup signal resources according to the configuration, wherein the second receiver is different from the first receiver and the one or more sequences comprises a wakeup signal for the UE.
2. The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
receive, using the second receiver associated with the wakeup subsystem of the UE, the wakeup signal based at least in part on the monitoring; and
enter the active mode based at least in part on the received wakeup signal.
3. The apparatus of claim 2 , wherein the wakeup signal comprises a scrambling sequence, and the instructions are further executable by the one or more processors to cause the apparatus to:
decode the wakeup signal based at least in part on the scrambling sequence, wherein the entering the active mode is further based at least in part on the decoding the wakeup signal.
4. The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
enter a low power mode outside the active mode; and
activate the second receiver associated with the wakeup subsystem of the UE based at least in part on the entering the low power mode, wherein the monitoring uses the second receiver associated with the wakeup subsystem of the UE based at least in part on the activating the second receiver.
5. The apparatus of claim 1 , wherein the second receiver associated with the wakeup subsystem of the UE operates using a lower power than the first receiver.
6. The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
operate in a discontinuous reception (DRX) mode, wherein the active mode corresponds to an active duration for the DRX mode.
7. The apparatus of claim 1 , wherein the control signaling configures the UE with a time resource, a frequency resource, or both for a respective wakeup signal resource of the plurality of wakeup signal resources.
8. The apparatus of claim 1 , wherein the instructions are further executable by the one or more processors to cause the apparatus to:
fail to receive, using the second receiver associated with the wakeup subsystem of the UE, the wakeup signal based at least in part on the monitoring; and
refrain from entering the active mode based at least in part on the failing to receive the wakeup signal.
9. The apparatus of claim 1 , wherein:
the wakeup subsystem supports wakeup signal reception and decoding at the UE outside the active mode; and
the second receiver associated with the wakeup subsystem comprises a low power receiver, a low complexity receiver, a simple correlator, or a combination thereof.
10. A method for wireless communications at a user equipment (UE), comprising:
receiving, using a first receiver, control signaling indicating a configuration that configures the UE to monitor, via a plurality of wakeup signal resources, for one or more sequences for initiating a wakeup procedure,
wherein the UE refrains from monitoring for the one or more sequences according to the configuration based at least in part on the UE operating in an active mode; and
monitoring, using a second receiver associated with a wakeup subsystem of the UE based at least in part on the UE operating outside the active mode, for the one or more sequences via the plurality of wakeup signal resources according to the configuration, wherein the second receiver is different from the first receiver and the one or more sequences comprises a wakeup signal for the UE.
11. The method of claim 10 , further comprising:
receiving, using the second receiver associated with the wakeup subsystem of the UE, the wakeup signal based at least in part on the monitoring; and
entering the active mode based at least in part on the received wakeup signal.
12. The method of claim 11 , wherein the wakeup signal comprises a scrambling sequence, the method further comprising:
decoding the wakeup signal based at least in part on the scrambling sequence, wherein the entering the active mode is further based at least in part on the decoding the wakeup signal.
13. The method of claim 10 , further comprising:
entering a low power mode outside the active mode; and
activating the second receiver associated with the wakeup subsystem of the UE based at least in part on the entering the low power mode, wherein the monitoring uses the second receiver associated with the wakeup subsystem of the UE based at least in part on the activating the second receiver.
14. The method of claim 10 , wherein the second receiver associated with the wakeup subsystem of the UE operates using a lower power than the first receiver.
15. The method of claim 10 , further comprising:
operating in a discontinuous reception (DRX) mode, wherein the active mode corresponds to an active duration for the DRX mode.
16. The method of claim 10 , wherein the control signaling configures the UE with a time resource, a frequency resource, or both for a respective wakeup signal resource of the plurality of wakeup signal resources.
17. The method of claim 10 , further comprising:
failing to receive, using the second receiver associated with the wakeup subsystem of the UE, the wakeup signal based at least in part on the monitoring; and
refraining from entering the active mode based at least in part on the failing to receive the wakeup signal.
18. The method of claim 10 , wherein:
the wakeup subsystem supports wakeup signal reception and decoding at the UE outside the active mode; and
the second receiver associated with the wakeup subsystem comprises a low power receiver, a low complexity receiver, a simple correlator, or a combination thereof.
19. An apparatus for wireless communications at a user equipment (UE), comprising:
means for receiving, using a first receiver, control signaling indicating a configuration that configures the UE to monitor, via a plurality of wakeup signal resources, for one or more sequences for initiating a wakeup procedure,
wherein the UE refrains from monitoring for the one or more sequences according to the configuration based at least in part on the UE operating in an active mode; and
means for monitoring, using a second receiver associated with a wakeup subsystem of the UE based at least in part on the UE operating outside the active mode, for the one or more sequences via the plurality of wakeup signal resources according to the configuration, wherein the second receiver is different from the first receiver and the one or more sequences comprises a wakeup signal for the UE.
20. The apparatus of claim 19 , further comprising:
means for receiving, using the second receiver associated with the wakeup subsystem of the UE, the wakeup signal based at least in part on the monitoring; and
means for entering the active mode based at least in part on the received wakeup signal.