Power saving techniques for sidelink communication
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify a set of one or more sidelink resources, and the UE may identify wake-up signal occasions associated with the resources. The UE may monitor for wake-up signals during the wake-up signal occasions, and the UE may further monitor the associated set of one or more resources based on receiving a wake-up signal. In some examples, respective sets of one or more sidelink resources may be associated with a number of multiple-input multiple-output layers used for sidelink communications, or may indicate respective bandwidth parts used for monitoring sidelink transmissions.
1. A method for wireless communication at a first user equipment (UE), comprising:
transmitting, to a second UE, a wake-up signal over a sidelink communication link during a wake-up signal occasion that corresponds to a set of one or more resources for sidelink communication with the second UE, the wake-up signal indicating a set of transmission time intervals for the second UE to monitor the set of one or more resources; and
transmitting, in accordance with the wake-up signal, a message to the second UE using the set of one or more resources that corresponds to the wake-up signal occasion.
2. The method of claim 1 , further comprising:
selecting the set of one or more resources from a plurality of sets of one or more resources for the sidelink communication, each set of the plurality of sets of resources being associated with respective wake-up signal occasions, wherein the wake-up signal associated with the set of one or more resources is transmitted based at least in part on the set of one or more resources.
3. The method of claim 2 , further comprising:
determining a quantity of multiple input multiple output (MIMO) layers for communicating with the second UE over the sidelink communication link, wherein the set of one or more resources are selected based at least in part on the quantity of MIMO layers.
4. The method of claim 1 , further comprising:
receiving, from a network entity, a resource grant indicating the set of one or more resources for the sidelink communication, wherein the wake-up signal associated with the set of one or more resources is transmitted based at least in part on the resource grant.
5. The method of claim 4 , wherein the set of one or more resources are associated with a quantity of multiple input multiple output (MIMO) layers.
6. The method of claim 1 , further comprising:
identifying one or more groups of slots for transmitting the message; and
transmitting the message during at least one of the one or more groups of slots, wherein the wake-up signal indicates the one or more groups of slots to the second UE.
7. The method of claim 6 , wherein the one or more groups of slots are indicated to the second UE via a bitmap.
8. The method of claim 1 , further comprising:
transmitting the wake-up signal in a first bandwidth part of the sidelink communication link, wherein transmitting the message comprises:
transmitting the message in a second bandwidth part that is different from the first bandwidth part.
9. The method of claim 8 , wherein the second bandwidth part is from a set of bandwidth parts associated with the sidelink communication.
10. The method of claim 1 , wherein transmitting the message comprises:
transmitting the message during one or more sidelink control channel periods, each sidelink control channel period comprising a physical sidelink control channel and a physical sidelink shared channel.
11. The method of claim 10 , wherein each sidelink control channel period has a duration of a slot.
12. A method for wireless communication at a first user equipment (UE), comprising:
receiving, from a second UE, a wake-up signal over a sidelink communication link based at least in part on monitoring a wake-up signal occasion that corresponds to a set of one or more resources for sidelink communication with the second UE, the wake-up signal indicating a set of transmission time intervals for the second UE to monitor the set of one or more resources; and
monitoring the set of one or more resources that is associated with the wake-up signal occasion for a transmission from the second UE corresponding to the received wake-up signal.
13. The method of claim 12 , further comprising:
identifying the set of one or more resources based at least in part on the received wake-up signal.
14. The method of claim 13 , further comprising:
identifying a bitmap that indicates the set of one or more resources based at least in part on the wake-up signal.
15. The method of claim 12 , further comprising:
identifying one or more groups of slots based at least in part on the received wake-up signal indicating the set of transmission time intervals, wherein monitoring the set of one or more resources for the transmission from the second UE is performed during each of the one or more groups of slots.
16. The method of claim 15 , further comprising:
refraining from monitoring one or more groups of time periods based at least in part on the received wake-up signal indicating the set of transmission time intervals, the one or more groups of time periods comprising symbol periods, or slots, or a combination thereof.
17. The method of claim 15 , wherein the the wake-up signal comprises a bitmap indicating the set of transmission time intervals.
18. The method of claim 12 , wherein the set of one or more resources are from a plurality of resources for the sidelink communication, each set of one or more resources the plurality of resources being associated with respective wake-up signal occasions.
19. The method of claim 18 , wherein each set of one or more resources the plurality of resources is associated with a respective quantity of multiple input multiple output (MIMO) layers.
20. The method of claim 12 , further comprising:
monitoring for the wake-up signal in a first bandwidth part of the sidelink communication link, wherein monitoring the set of one or more resources for the transmission comprises:
monitoring a second bandwidth part that is different from the first bandwidth part.
21. The method of claim 20 , wherein the second bandwidth part is from a set of bandwidth parts associated with the sidelink communication.
22. The method of claim 12 , wherein monitoring the set of one or more resources for the transmission comprises:
monitoring the set of one or more resources during one or more sidelink control channel periods, each sidelink control channel period comprising a physical sidelink control channel and a physical sidelink shared channel.
23. The method of claim 22 , wherein each sidelink control channel period has a duration of a slot.
24. The method of claim 22 , wherein the physical sidelink control channel and the physical sidelink shared channel are non-overlapping in time, or non-overlapping in frequency, or overlapping in time, or overlapping in frequency, or any combination thereof.
25. A method for wireless communication at a network entity, comprising:
identifying a set of one or more resources for sidelink communication between a first user equipment (UE) and second UE over a sidelink communication link, wherein the set of one or more resources correspond to one or more wake-up signal occasions, and wherein the one or more wake-up signal occasions comprise a set of transmission time intervals for the first UE or the second UE to monitor the set of one or more resources; and
transmitting, to the first UE, a resource grant scheduling the set of one or more resources that corresponds to the one or more wake-up signal occasions on the sidelink communication link.
26. The method of claim 25 , wherein identifying the set of one or more resources comprises:
selecting the set of one or more resources from a plurality of resources for the sidelink communication, each set of one or more resources of the plurality of resources being associated with respective wake-up signal occasions.
27. The method of claim 26 , wherein identifying the set of one or more resources comprises:
determining a quantity of multiple input multiple output (MIMO) layers for the sidelink communication, wherein the set of one or more resources are selected based at least in part on the quantity of MIMO layers.
28. The method of claim 25 , wherein the set of one or more resources comprises one or more sidelink control channel periods, each sidelink control channel period comprising a physical sidelink control channel and a physical sidelink shared channel.
29. The method of claim 28 , wherein each sidelink control channel period has a duration of a slot.
30. An apparatus for wireless communication at a first user equipment (UE), comprising:
a processor; and
memory coupled to the processor, the processor and memory configured to:
transmit, to a second UE, a wake-up signal over a sidelink communication link during a wake-up signal occasion that corresponds to a set of one or more resources for sidelink communication with the second UE, the wake-up signal indicating a set of transmission time intervals for the second UE to monitor the set of one or more resources; and
transmit, in accordance with the wake-up signal, a message to the second UE using the set of one or more resources that corresponds to the wake-up signal occasion.