Sidelink power control
Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for efficiently performing and reporting reference signal received power (RSRP) measurements. In particular, the techniques described herein may allow a user equipment (UE) to efficiently identify reference signals on which to perform RSRP measurements (e.g., based on signaling from a base station), identify when to report RSRP measurements (e.g., aperiodically, periodically, or semi-persistently), and identify a channel on which to report RSRP measurements (e.g., a sidelink channel or an uplink channel). In addition, the techniques described herein may also allow a UE to efficiently identify open loop parameters to use to determine an appropriate transmit power for transmitting to another UE over a sidelink.
1. A first user equipment (UE), comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the first UE to:
receive signaling to support subsequent communication with a second UE over a sidelink, wherein the signaling comprises first configuration information for a first open loop parameter set available for the second UE to use to calculate a transmit power based at least in part on a downlink pathloss between a network node and the first UE, and wherein the signaling comprises second configuration information for a second open loop parameter set available for the second UE to use to calculate a transmit power based at least in part on a sidelink pathloss between the second UE and the first UE;
receive, over the sidelink, a reference signal from the second UE;
obtain a reference signal received power measurement based at least in part on the received reference signal;
transmit a report indicating the reference signal received power measurement; and
receive a sidelink transmission from the second UE, wherein the sidelink transmission is associated with a transmit power that is based at least in part on the reference signal received power measurement and the first open loop parameter set, the second open loop parameter set, or any combination thereof.
2. The first UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:
receive control signaling indicating that the first UE is to report the reference signal received power measurement, wherein the one or more processors are individually or collectively operable to execute the code to cause the first UE to transmit the report in response to the control signaling.
3. The first UE of claim 2 , wherein the control signaling indicating that the first UE is to report the reference signal received power measurement comprises downlink control information from a network entity or sidelink control information from the second UE.
4. The first UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:
transmit the report based at least in part on a signal to interference plus noise ratio of the received reference signal being above or below a threshold.
5. The first UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:
receive control signaling that indicates an activation of reporting of reference signal received power measurements; and
transmit the report based at least in part on the indicated activation.
6. The first UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:
receive control signaling indicating that the UE is to report reference signal received power measurements on a periodic basis; and
transmit the report based at least in part on the periodic basis.
7. The first UE of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the first UE to:
receive control information indicating resources on which the reference signal is to be received, wherein performing the reference signal received power measurement is based at least in part on receiving the control information.
8. The first UE of claim 7 , wherein the control information comprises downlink control information from a network entity or sidelink control information from the second UE.
9. A second user equipment (UE), comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the second UE to:
receive signaling to support subsequent communication with a first UE over a sidelink, wherein the signaling comprises first configuration information for a first open loop parameter set available for the second UE to use to calculate a transmit power based at least in part on a downlink pathloss between a network node and the first UE, and wherein the signaling comprises second configuration information for a second open loop parameter set available for the second UE to use to calculate a transmit power based at least in part on a sidelink pathloss between the second UE and the first UE;
transmit, over the sidelink, a reference signal to the first UE;
receive a report indicating a reference signal received power measurement that is based at least in part on the reference signal; and
transmit a sidelink transmission to the first UE using a transmit power that is based at least in part on the reference signal received power measurement and the first open loop parameter set, the second open loop parameter set, or any combination thereof.
10. The second UE of claim 9 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the second UE to:
transmit control signaling indicating that the first UE is to report the reference signal received power measurement; and
monitor for the report based at least in part on the control signaling.
11. The second UE of claim 10 , wherein the control signaling indicating that the first UE is to report the reference signal received power measurement comprises sidelink control information.
12. The second UE of claim 9 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the second UE to:
monitor for the report based at least in part on transmission of the reference signal to the first UE.
13. The second UE of claim 9 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the second UE to:
transmit control signaling that indicates an activation of reporting of reference signal received power measurements; and
monitor for the report based at least in part on the indicated activation.
14. The second UE of claim 9 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the second UE to:
transmit control signaling indicating that the UE is to report reference signal received power measurements on a periodic basis; and
monitor for the report based at least in part on the periodic basis.
15. The second UE of claim 9 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the second UE to:
transmit, to the first UE, control information indicating resources on which the reference signal is to be transmitted.
16. The second UE of claim 15 , wherein the control information comprises sidelink control information.
17. A method for wireless communication at a second user equipment (UE), comprising:
receiving signaling to support subsequent communication with a first UE over a sidelink, wherein the signaling comprises first configuration information for a first open loop parameter set available for the second UE to use to calculate a transmit power based at least in part on a downlink pathloss between a network node and the first UE, and wherein the signaling comprises second configuration information for a second open loop parameter set available for the second UE to use to calculate a transmit power based at least in part on a sidelink pathloss between the second UE and the first UE;
transmitting, over the sidelink, a reference signal to the first UE;
receiving a report indicating a reference signal received power measurement that is based at least in part on the reference signal; and
transmitting a sidelink transmission to the first UE using a transmit power that is based at least in part on the reference signal received power measurement and the first open loop parameter set, the second open loop parameter set, or any combination thereof.
18. The method of claim 17 , further comprising:
transmit control signaling indicating that the first UE is to report the reference signal received power measurement; and
monitoring for the report based at least in part on the control signaling.
19. The method of claim 18 , wherein the control signaling indicating that the first UE is to report the reference signal received power measurement comprises sidelink control information.
20. The method of claim 17 , further comprising:
monitor for the report based at least in part on transmission of the reference signal to the first UE.