Techniques and apparatuses for bandwidth part wake-up signaling
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may monitor, in a first bandwidth part, of a plurality of bandwidth parts, associated with a first monitoring periodicity and in a downlink control channel, for a downlink control information (DCI) message. The user equipment may selectively transition, based at least in part on the DCI message, from the first bandwidth part to a second bandwidth part, of the plurality of bandwidth parts, associated with a second monitoring periodicity that is less than the first monitoring periodicity. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
monitoring, in a first bandwidth part associated with a first set of downlink timing parameters and in a downlink control channel, for a downlink control information (DCI) message;
selectively transitioning, based at least in part on the DCI message, from the first bandwidth part to a second bandwidth part associated with a second set of downlink timing parameters that is different than the first set of downlink timing parameters,
wherein the UE is configured to support a plurality of wake-up stages,
wherein the plurality of wake-up stages include a grant processing, lower power level wake-up stage and include a full operation, high power level wake-up stage,
wherein the first bandwidth part and the second bandwidth part are each associated with a set of uplink timing parameters, k 2 , that are configured for cross-slot scheduling, and
wherein the first bandwidth part and the second bandwidth part are configured such that k 2 is at least 2; and
selectively communicating on the second bandwidth after the selectively transitioning.
2. The method of claim 1 , wherein data is scheduled across a plurality of consecutive slots.
3. The method of claim 1 , wherein the UE is configured to operate in a microsleep mode.
4. The method of claim 1 , wherein the UE determines a scheduling delay value associated with a first monitoring period in the first bandwidth part or a second monitoring period in the second bandwidth part based at least in part on stored information identifying a plurality of candidate channel scheduling values.
5. The method of claim 4 , wherein a microsleep mode is enabled after a last downlink control symbol and for at least a non-scheduled slot.
6. The method of claim 1 , wherein the UE is configured to transition between a same-slot scheduling mode and a cross-slot scheduling mode.
7. The method of claim 6 , wherein one of the first bandwidth part or the second bandwidth part is associated with the same-slot scheduling mode and another of the first bandwidth part or the second bandwidth part is associated with the cross-slot scheduling mode.
8. The method of claim 1 , wherein the DCI message identifies a plurality of candidate channel delay values for at least one type of channel delay value of a plurality of types of channel delay values.
9. The method of claim 1 , wherein the DCI message indicates a transition from a same-slot scheduling mode to a cross-slot scheduling mode or from the cross-slot scheduling mode to the same-slot scheduling mode.
10. The method of claim 1 , wherein a transition from a same-slot scheduling mode to a cross-slot scheduling mode or from the cross-slot scheduling mode to the same-slot scheduling mode is triggered based at least in part on expiration of a timer.
11. The method of claim 1 , wherein during an on duration of a connected mode discontinuous reception (CDRX) mode the UE is configured to wake on the first bandwidth part, which is a grant-processing only bandwidth part, and is configured to transition to the second bandwidth part, which is not a grant-processing only bandwidth part, based at least in part on detecting a grant,
wherein the second bandwidth part is associated with a smaller delay value and a bandwidth not smaller than the first bandwidth part.
12. A user equipment (UE) for wireless communication, comprising:
memory; and
one or more processors coupled to the memory; and
instructions stored in the memory and operable, when executed by the one or more processors to cause the UE to:
monitor, in a first bandwidth part, of a plurality of bandwidth parts, associated with a first monitoring periodicity and in a downlink control channel, for a downlink control information (DCI) message; and
selectively transition, based at least in part on the DCI message, from the first bandwidth part to a second bandwidth part, of the plurality of bandwidth parts, associated with a second monitoring periodicity that is less than the first monitoring periodicity,
wherein the UE is configured to support a plurality of wake-up stages,
wherein the plurality of wake-up stages include a grant processing, lower power level wake-up stage and include a full operation, high power level wake-up stage,
wherein the first bandwidth part and the second bandwidth part are each associated with a set of uplink timing parameters, k 2 , that are configured for cross-slot scheduling, and
wherein the first bandwidth part and the second bandwidth part are configured such that k 2 is at least 2.
13. The UE of claim 12 , wherein data is scheduled across a plurality of consecutive slots.
14. The UE of claim 12 , wherein the UE is configured to operate in a microsleep mode.
15. The UE of claim 12 , wherein the UE is configured to determine a channel delay value associated with a first monitoring period in the first bandwidth part or a second monitoring period in the second bandwidth part based at least in part on stored information identifying a plurality of candidate channel delay values.
16. A non-transitory computer-readable medium storing instructions for wireless communication,
that, when executed by one or more processors of a user equipment (UE), cause the UE to:
monitor, in a first bandwidth part, of a plurality of bandwidth parts, associated with a first monitoring periodicity and in a downlink control channel, for a downlink control information (DCI) message,
wherein the DCI message includes bandwidth part activation information or bandwidth part activation information and a downlink grant,
wherein the DCI is a user equipment-specific, bandwidth part-specific DCI; and
selectively transition, based at least in part on the DCI message, from the first bandwidth part to a second bandwidth part, of the plurality of bandwidth parts, associated with a second monitoring periodicity that is less than the first monitoring periodicity,
wherein the UE is configured to support a plurality of wake-up stages,
wherein the plurality of wake-up stages include a grant processing, lower power level wake-up stage and include a full operation, high power level wake-up stage,
wherein the first bandwidth part and the second bandwidth part are each associated with a set of uplink timing parameters, k 2 , that are configured for cross-slot scheduling, and
wherein the first bandwidth part and the second bandwidth part are configured such that k 2 is at least 2.
17. The non-transitory computer-readable medium of claim 16 , wherein the DCI message identifies a size of a gap between the DCI message and a grant transmission.
18. The non-transitory computer-readable medium of claim 16 , wherein a size of a gap between the DCI message and a grant transmission is greater than a state transition time for a modem of the UE.
19. The non-transitory computer-readable medium of claim 16 , wherein the first monitoring periodicity is greater than a size of a gap between the DCI message and a grant transmission.
20. The non-transitory computer-readable medium of claim 16 , wherein the first monitoring periodicity is greater than an on duration of the UE.
21. The non-transitory computer-readable medium of claim 16 , wherein the UE does not decode the downlink control channel in connection with monitoring the downlink control channel.
22. The non-transitory computer-readable medium of claim 16 , wherein selectively transitioning comprises forgoing transitioning to the second bandwidth part based at least in part on not decoding the downlink control channel.
23. The non-transitory computer-readable medium of claim 16 , wherein the UE is configured to transition from a low-power mode to a sleep mode based at least in part on not decoding the downlink control channel.
24. The non-transitory computer-readable medium of claim 16 , wherein the UE is not scheduled for a discontinuous reception cycle that includes the monitoring.
25. An apparatus for wireless communication, comprising:
means for monitoring, in a first bandwidth part, of a plurality of bandwidth parts, associated with a first monitoring periodicity and in a downlink control channel, for a downlink control information (DCI) message; and
means for selectively transitioning, based at least in part on the DCI message, from the first bandwidth part to a second bandwidth part, of the plurality of bandwidth parts, associated with a second monitoring periodicity that is less than the first monitoring periodicity,
wherein the apparatus is configured to support a plurality of wake-up stages,
wherein the plurality of wake-up stages include a grant processing, lower power level wake-up stage and include a full operation, high power level wake-up stage,
wherein the first bandwidth part and the second bandwidth part are each associated with a set of uplink timing parameters, k 2 , that are configured for cross-slot scheduling, and
wherein the first bandwidth part and the second bandwidth part are configured such that k 2 is at least 2.
26. The apparatus of claim 25 , wherein a bandwidth part configuration for the first bandwidth part or the second bandwidth part includes a downlink control channel monitoring periodicity.
27. The apparatus of claim 25 , wherein a bandwidth part configuration for the first bandwidth part or the second bandwidth part includes one or more downlink timing parameters.
28. The apparatus of claim 25 , wherein the DCI message is received based at least in part on a data traffic characteristic.
29. The apparatus of claim 25 , wherein the first bandwidth part is associated with a first monitoring mode associated with less than a threshold data traffic and greater than a threshold latency, and
wherein the second bandwidth part is associated with a second monitoring mode associated with not less than the threshold data traffic and not greater than the threshold latency.
30. The apparatus of claim 25 , wherein during an on duration of a connected mode discontinuous reception (CDRX) mode the apparatus is configured to wake on the first bandwidth part, which is a grant-processing only bandwidth part, and is configured to transition to the second bandwidth part, which is not a grant-processing only bandwidth part, based at least in part on detecting a grant,
wherein the second bandwidth part is associated with a smaller delay value and a bandwidth not smaller than the first bandwidth part.