Power control for sidelink feedback

1. A method comprising:

receiving, by a first wireless device from a base station, a configuration message indicating:

a first power control parameter set for a first sidelink feedback type indicating that the first wireless device shares a feedback channel with additional first wireless devices; and

a second power control parameter set for a second sidelink feedback type indicating that the first wireless device uses a separate feedback channel from the additional first wireless devices;

receiving, by the first wireless device from a second wireless device, a sidelink feedback type indication of one of:

the first sidelink feedback type; or

the second sidelink feedback type;

selecting as a selected power control parameter set, by the first wireless device based on the sidelink feedback type indication, one of:

the first power control parameter set; or

the second power control parameter set;

determining, by the first wireless device, a transmit power of a sidelink feedback signal based on the selected power control parameter set; and

transmitting, by the first wireless device to the second wireless device, the sidelink feedback signal based on the transmit power.

2. The method of claim 1 , wherein the configuration message is received via a system information block or a radio resource control message.

3. The method of claim 1 , wherein the first wireless device transmits a sidelink feedback to the second wireless device via a physical sidelink feedback channel.

4. The method of claim 1 , wherein each of the first power control parameter set and the second power control parameter set comprise:

a minimum power; and

a pathloss compensation factor.

5. The method of claim 1 , wherein the sidelink feedback signal indicates:

a hybrid automatic repeat request (HARQ) acknowledgement (ACK); or

a HARQ non-acknowledgement (NACK).

6. The method of claim 1 , wherein the sidelink feedback type indication is received via a physical sidelink control channel.

7. The method of claim 1 , further comprising receiving, by the first wireless device from the base station, a message comprising a pathloss reference node indicator to indicate a pathloss estimation reference node whether it is from the base station or a wireless device.

8. The method of claim 7 , further comprising:

determining, by the first wireless device, a transmit power of one or more sidelink signals based on:

the pathloss reference node indicator;

the first power control parameter set; and

the second power control parameter set; and

transmitting, by the first wireless device to the second wireless device, the one or more sidelink signals based on the determining of the transmit power of the one or more sidelink signals.

9. A first wireless device comprising:

one or more processors;

memory storing instructions that, when executed by the one or more processors, cause the first wireless device to:

receive from a base station, a configuration message indicating:

a first power control parameter set for a first sidelink feedback type indicating that the first wireless device shares a feedback channel with additional first wireless devices; and

a second power control parameter set for a second sidelink feedback type indicating that the first wireless device uses a separate feedback channel from the additional first wireless devices;

receive, from a second wireless device, a sidelink feedback type indication of one of:

the first sidelink feedback type; or

the second sidelink feedback type;

select, as a selected power control parameter set, based on the sidelink feedback type indication, one of:

the first power control parameter set; or

the second power control parameter set;

determine a transmit power of a sidelink feedback signal based on the selected power control parameter set; and

transmit to the second wireless device, the sidelink feedback signal based on the transmit power.

10. The first wireless device of claim 9 , wherein each of the first power control parameter set and the second power control parameter set comprise:

a minimum power; and

a pathloss compensation factor.

11. The first wireless device of claim 9 , wherein the first wireless device transmits a sidelink feedback to the second wireless device via a physical sidelink feedback channel.

12. The first wireless device of claim 11 , wherein the configuration message is received via a system information block or a radio resource control message.

13. The first wireless device of claim 11 , wherein the sidelink feedback type indication is received via a physical sidelink control channel.

14. The first wireless device of claim 11 , wherein the instructions, when executed by the one or more processors, further cause the first wireless device to receive, from the base station, a message comprising a pathloss reference node indicator to indicate a pathloss estimation reference node whether it is from the base station or a wireless device.

15. The first wireless device of claim 14 , wherein the instructions, when executed by the one or more processors, further cause the first wireless device to:

determine, a transmit power of one or more sidelink signals based on:

the pathloss reference node indicator;

the first power control parameter set; and

the second power control parameter set; and

transmit, to the second wireless device, the one or more sidelink signals based on the determination of the transmit power of the one or more sidelink signals.

16. A system comprising:

a base station comprising:

one or more first processors; and

first memory storing first instructions that, when executed by the one or more first processors, cause the base station to transmit a configuration message indicating:

a first power control parameter set for a first sidelink feedback type indicating that a wireless device shares a feedback channel with additional wireless devices; and

a second power control parameter set for a second sidelink feedback type indicating that the first wireless device uses a separate feedback channel from the additional first wireless devices;

the wireless device comprising:

one or more second processors; and

second memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to

receive the configuration message;

receive, from a second wireless device, a sidelink feedback type indication of one of:

the first sidelink feedback type; or

the second sidelink feedback type;

select, as a selected power control parameter set, based on the sidelink feedback type indication, one of:

the first power control parameter set; or

the second power control parameter set;

determine a transmit power of a sidelink feedback signal based on the selected power control parameter set; and

transmit to the second wireless device, the sidelink feedback signal based on the transmit power.