Power control techniques for a communication system that includes a repeater

1. A repeater that relays communications, comprising:

a processor; and

a memory coupled with the processor, wherein the memory includes instructions executable by the processor to cause the repeater to:

determine a downlink gain value to use for one or more downlink initial access messages received at the repeater;

determine an uplink gain value to use for one or more uplink initial access messages received at the repeater, wherein the uplink gain value is based on the downlink gain value and a noise level related to a channel between a communication device and the repeater;

receive a downlink initial access message;

apply the downlink gain value to the downlink initial access message;

receive an uplink initial access message; and

apply the uplink gain value to the uplink initial access message.

2. The repeater of claim 1 , wherein the downlink initial access message is a synchronization signal block (SSB) message and the uplink initial access message is a random-access channel (RACH) preamble message.

3. The repeater of claim 1 , wherein the memory includes instructions executable by the processor to cause the repeater to:

transmit a gain adjusted version of the downlink initial access message to the communication device via one or more transmission antennas of the repeater; and

transmit a gain adjusted version of the uplink initial access message to the base station via one or more transmission antennas of the repeater.

4. The repeater of claim 1 , wherein the memory includes instructions executable by the processor to cause the repeater to:

receive gain configuration information at the repeater from a controlling node, wherein the gain configuration information includes an indication of the downlink gain value, an indication of the uplink gain value, or both.

5. The repeater of claim 4 , wherein the instructions executable by the processor to cause the repeater to determine the downlink gain value comprise instructions executable by the processor to cause the repeater to identify the downlink gain value from the gain configuration information received from the controlling node.

6. The repeater of claim 4 , wherein the instructions executable by the processor to cause the repeater to determine the uplink gain value comprise instructions executable by the processor to cause the repeater to identify the uplink gain value from the gain configuration information received from the controlling node.

7. The repeater of claim 6 , wherein the gain configuration information includes an explicit indication of the uplink gain value for use at the repeater.

8. The repeater of claim 6 , wherein the gain configuration information includes an offset value, and the memory includes instructions executable by the processor to cause the repeater to calculate the uplink gain value based on a reduction relative to the downlink gain value by an amount of the offset value.

9. The repeater of claim 4 , wherein the gain configuration information includes an instruction for the repeater to set the uplink gain value to be equal to the downlink gain value in response to the noise level being below a threshold.

10. The repeater of claim 4 , wherein the gain configuration information includes an instruction for the repeater to set the uplink gain value to be less than the downlink gain value in response to the noise level being above a threshold.

11. The repeater of claim 1 , wherein the instructions executable by the processor to cause the repeater to determine the uplink gain value comprise instructions executable by the processor to cause the repeater to:

determine the noise level related to the channel between the communication device and the repeater;

compare the noise level to a threshold; and

select the uplink gain value to be equal to the downlink gain value in response to the noise level being below the threshold.

12. The repeater of claim 1 , wherein the instructions executable by the processor to cause the repeater to determine the uplink gain value comprise instructions executable by the processor to cause the repeater to:

determine the noise level related to the channel between the communication device and the repeater;

compare the noise level to a threshold; and

select the uplink gain value to be less than the downlink gain value in response to the noise level being above the threshold.

13. The repeater of claim 1 , further comprising:

one or more receive antennas; and

one or more transmit antennas;

wherein the one or more receive antennas are configured to receive the uplink initial access message as an analog millimeter wave signal based on receive beamforming;

wherein the instructions executable by the processor to cause the repeater to apply the uplink gain value comprise instructions executable by the processor to cause the repeater to amplify the analog millimeter wave signal without performing analog-to-digital conversion of the analog millimeter wave signal; and

wherein the one or more transmit antennas are configured to transmit a gain adjusted version of the analog millimeter wave signal via one or more transmit antennas and based on transmit beamforming.

14. A method of wireless communication performed by a repeater that relays communications, comprising:

determining a downlink gain value to use for one or more downlink initial access messages received at the repeater;

determining an uplink gain value to use for one or more uplink initial access messages received at the repeater, wherein the uplink gain value is based on the downlink gain value and a noise level related to a channel between a communication device and the repeater;

receiving a downlink initial access message;

applying the downlink gain value to the downlink initial access message;

receiving an uplink initial access message; and

applying the uplink gain value to the uplink initial access message.

15. The method of claim 14 , further comprising:

receiving gain configuration information at the repeater from a controlling node, wherein the gain configuration information includes an indication of the downlink gain value, an indication of the uplink gain value, or both.

16. The method of claim 15 , wherein the gain configuration information includes an offset value, and the method further comprises calculating the uplink gain value based on a reduction relative to the downlink gain value by an amount of the offset value.

17. The method of claim 14 , wherein determining the uplink gain value comprises:

determining the noise level related to the channel between the communication device and the repeater;

comparing the noise level to a threshold; and

selecting the uplink gain value to be equal to the downlink gain value in response to the noise level being below the threshold.

18. The method of claim 14 , wherein determining the uplink gain value comprises:

determining the noise level related to the channel between the communication device and the repeater;

comparing the noise level to a threshold; and

selecting the uplink gain value to be less than the downlink gain value in response to the noise level being above the threshold.