Sidelink power control using shared resources
Methods, systems, and devices for wireless communication are described. A user equipment (UE) that is configured with two sets of power control parameters may be signaled (e.g., via downlink control information (DCI)) as to which set of parameters to use for determining the transmission power on a sidelink channel. The UE may determine a transmit power for a sidelink message based on the indication included in the DCI. The base station may transmit the indication based on whether uplink or downlink communications are scheduled on resources that may overlap with resources used for transmission of the sidelink message.
1. An apparatus for wireless communications at a first user equipment (UE), comprising:
a processor;
memory coupled with the processor, the processor and memory configured to:
receive, from a network entity, a downlink control information message that includes an indication to use one or both of a first set of power control parameters and a second set of power control parameters for a sidelink message,
wherein the first set of power control parameters includes a first value for a target receive power and the second set of power control parameters includes a second value for the target receive power; and
transmit, to a second UE, the sidelink message using a transmission power in accordance with the first value or the second value for the target receive power based at least in part on the indication to use one or both of the first set of power control parameters and the second set of power control parameters.
2. The apparatus of claim 1 , further comprising:
an antenna configured to receive, from the network entity, a radio resource control signal or the downlink control information message that indicates the first set of power control parameters and the second set of power control parameters.
3. The apparatus of claim 1 , wherein:
the downlink control information message includes a field with the indication to use one or both of the first set of power control parameters or the second set of power control parameters, and
the processor and memory are configured to transmit the sidelink message using the transmission power determined in accordance with a value included in the field.
4. The apparatus of claim 3 , wherein the field comprises a bit flag.
5. The apparatus of claim 1 , wherein:
the downlink control information message schedules at least one resource for the sidelink message to be transmitted to the second UE.
6. The apparatus of claim 1 , wherein,
the downlink control information message includes the indication to use either the first set of power control parameters or the second set of power control parameters,
both the first set of power control parameters and the second set of power control parameters are associated with a downlink pathloss from the network entity to the first UE, and
the processor and memory are configured to transmit the sidelink message using the transmission power that is based at least in part on the first set of power control parameters or the second set of power control parameters in accordance with the indication.
7. The apparatus of claim 1 , wherein:
the downlink control information message includes the indication to use the second set of power control parameters for the sidelink message,
the first set of power control parameters is associated with a downlink pathloss from the network entity to the first UE and the second set of power control parameters is associated with a sidelink pathloss between the first UE and the second UE, and
the processor and memory are configured to transmit the sidelink message using the transmission power that is based at least in part on the second set of power control parameters in accordance with the indication.
8. The apparatus of claim 1 , wherein:
the downlink control information message includes the indication to use both the first set of power control parameters and the second set of power control parameters for the sidelink message,
the first set of power control parameters is associated with a downlink pathloss from the network entity to the first UE and the second set of power control parameters is associated with a sidelink pathloss between the first UE and the second UE, and
the processor and memory are configured to transmit the sidelink message using a lower transmission power of transmission powers determined using the first set of power control parameters and the second set of power control parameters.
9. The apparatus of claim 1 , wherein:
the downlink control information message includes the indication to use either the first set of power control parameters or the second set of power control parameters,
both the first set of power control parameters and the second set of power control parameters are associated with a sidelink pathloss between the first UE and the second UE, and
the processor and memory are configured to transmit the sidelink message using the transmission power that is determined based at least in part on the first set of power control parameters or the second set of power control parameters in accordance with the indication.
10. The apparatus of claim 1 , wherein, to receive the downlink control information message, the processor and memory are configured to:
receive the downlink control information message in a group common downlink control information message that includes the indication for each resource of a set of resources,
wherein the transmission power is determined based at in least in part on a resource used for transmission of the sidelink message.
11. The apparatus of claim 1 , wherein, to receive the downlink control information message, the processor and memory are configured to:
receive the downlink control information message in a group common downlink control information message that includes the indication for each UE of a set of UEs,
wherein the transmission power is determined based at least in part on the indication that corresponds to the first UE.
12. The apparatus of claim 1 , wherein the processor and memory are configured to:
receive, from the network entity, an indication of a radio network temporary identifier that corresponds to a group common downlink control information message,
wherein the processor and memory are configured to receive the downlink control information message in the group common downlink control information message that is scrambled by the radio network temporary identifier and includes the indication.
13. The apparatus of claim 1 , wherein:
the first set of power control parameters and the second set of power control parameters include a respective value for a target receive power and a respective value for a pathloss compensation component.
14. The apparatus of claim 1 , wherein:
the first set of power control parameters comprises a value for a target receive power and an offset value, and
a value for a target receive power for the second set of power control parameters is based at least in part on the value for the target receive power and the offset value.
15. The apparatus of claim 1 , wherein:
the sidelink message is associated with a first priority, and
the first set of power control parameters and the second set of power control parameters are based at least in part on the first priority.
16. The apparatus of claim 1 , wherein the processor and memory are further configured to:
receive a control signal that indicates sets of parameters to utilize per geographical zone of a set of geographical zones, and
wherein the first set of power control parameters and the second set of power control parameters are based at least in part on the geographical zone.
17. An apparatus for wireless communications at a network entity, comprising:
a processor;
memory coupled with the processor, the processor and memory configured to:
transmit, to a first user equipment (UE), a downlink control information message that includes an indication to use one or both of a first set of power control parameters and a second set of power control parameters for a sidelink message based at least in part on at least one resource for communication with a second UE,
wherein the first set of power control parameters includes a first value for a target receive power and the second set of power control parameters includes a second value for the target receive power; and
communicate with the second UE using the at least one resource.
18. The apparatus of claim 17 , wherein the processor and memory are further configured to:
transmit, to the first UE, a radio resource control signal or the downlink control information message that indicates the first set of power control parameters and the second set of power control parameters.
19. The apparatus of claim 17 , wherein:
the downlink control information message includes a field with the indication to use one or both of the first set of power control parameters or the second set of power control parameters.
20. The apparatus of claim 19 , wherein the field comprises a bit flag.
21. The apparatus of claim 17 , wherein:
the downlink control information message schedules at least one second resource for the sidelink message.
22. The apparatus of claim 17 , wherein:
the indication is based at least in part on at least one second resource partially overlapping with the at least one resource.
23. The apparatus of claim 17 , wherein:
a geographical zone is associated with the first UE or a third UE scheduled to receive a sidelink message from the first UE, and
the indication is based at least in part on geographical zone.
24. The apparatus of claim 17 , wherein the processor and memory are further configured to:
transmit a control signal that indicates sets of parameters to utilize per geographical zone of a set of geographical zones.
25. An apparatus for wireless communications at a first user equipment (UE), comprising:
a processor;
memory coupled with the processor, the processor and memory configured to:
receive, from a network entity, a downlink control information message that includes an indication to use one or both of a first set of power control parameters and a second set of power control parameters for a sidelink message,
wherein the first set of power control parameters includes a first value for a target receive power and the second set of power control parameters includes a second value for the target receive power; and
receive, from a second UE, a sidelink message at a receive power in accordance with the first value or the second value for the target receive power based at least in part on the indication to use one or both of the first set of power control parameters and the second set of power control parameters.
26. The apparatus of claim 25 , wherein:
the processor and memory are configured to transmit the sidelink message to the first UE using a transmission power that is determined in accordance with the indication.
27. The apparatus of claim 25 , wherein, to receive the downlink control information message, the processor and memory are configured to:
receive the downlink control information message in a group common downlink control information message that includes the indication for each UE of a set of UEs.
28. The apparatus of claim 25 , wherein, to receive the downlink control information message, the processor and memory are configured to:
receive the downlink control information message in a group common downlink control information message that includes the indication for each resource of a set of resources.
29. A method for wireless communications at a first user equipment (UE), comprising:
receiving, from a network entity, a downlink control information message that includes an indication to use one or both of a first set of power control parameters and a second set of power control parameters for a sidelink message,
wherein the first set of power control parameters includes a first value for a target receive power and the second set of power control parameters includes a second value for the target receive power; and
transmitting, to a second UE, the sidelink message using a transmission power in accordance with the first value or the second value for the target receive power based at least in part on the indication to use one or both of the first set of power control parameters and the second set of power control parameters.