Power-adaptive sidelink data transmissions

1. A method for wireless communication in a wireless communications system, comprising:

transmitting a request to send (RTS) message with a first transmit power to a receiving device over a sidelink connection with the receiving device;

receiving a clear to send (CTS) message from the receiving device in response to the RTS message, wherein the CTS message is transmitted with a power that is inversely proportional to a power associated with the RTS message;

determining to refrain from using the first transmit power for a data transmission;

identifying a second transmit power for the data transmission based at least in part on the received CTS message; and

transmitting the data transmission with the second transmit power to the receiving device over the sidelink connection with the receiving device.

2. The method of claim 1 , further comprising:

identifying a threshold power for the data transmission based at least in part on neighboring communications; and

identifying the second transmit power for the data transmission based at least in part on the identified threshold power.

3. The method of claim 2 , wherein the neighboring communications are associated with a higher priority than the data transmission.

4. The method of claim 1 , further comprising:

identifying, in the CTS message, channel quality information (CQI) associated with the RTS message; and

identifying the second transmit power for the data transmission based at least in part on the CQI.

5. The method of claim 1 , further comprising:

identifying a modulation and coding scheme (MCS) for the data transmission; and

identifying the second transmit power for the data transmission based at least in part on the MCS.

6. The method of claim 5 , wherein the data transmission comprises a portion of a larger data transmission.

7. The method of claim 1 , wherein the second transmit power is less than the first transmit power.

8. The method of claim 1 , wherein the RTS message comprises a reference signal.

9. The method of claim 1 , wherein the wireless communications system comprises a millimeter wave (mmW) system or a sub6 GHz system.

10. A method for wireless communication in a wireless communications system, comprising:

receiving a request to send (RTS) message from a transmitting device over a sidelink connection with the transmitting device, the RTS message transmitted by the transmitting device with a first transmit power;

transmitting a clear to send (CTS) message to the transmitting device based at least in part on receiving the RTS message, wherein the CTS message is transmitted with a power that is inversely proportional to a power associated with the RTS message; and

receiving a data transmission from the transmitting device over the sidelink connection with the transmitting device, the data transmission transmitted by the transmitting device with a second transmit power that is different from the first transmit power.

11. The method of claim 10 , further comprising:

determining channel quality information (CQI) based at least in part on the RTS message; and

transmitting the CQI in the CTS message to the transmitting device.

12. The method of claim 10 ; wherein the CTS message comprises an indication of a priority of the data transmission.

13. The method of claim 10 , wherein the second transmit power is less than the first transmit power.

14. The method of claim 10 , wherein the wireless communications system comprises a millimeter wave (mmW) system or a sub6 GHz system.

15. The method of claim 10 , wherein the RTS message comprises a reference signal.

16. An apparatus for wireless communication in a wireless communications system, comprising:

a processor;

memory in electronic communication with the processor; and

the processor and memory configured to:

transmit a request to send (RTS) message with a first transmit power to a receiving device over a sidelink connection with the receiving device;

receive a clear to send (CTS) message from the receiving device in response to the RTS message, wherein the CTS message is transmitted with a power that is inversely proportional to a power associated with the RTS message;

determine to refrain from using the first transmit power for a data transmission;

identify a second transmit power for the data transmission based at least in part on the received CTS message; and

transmit the data transmission with the second transmit power to the receiving device over the sidelink connection with the receiving device.

17. The apparatus of claim 16 , wherein the processor and memory are further configured to:

identify a threshold power for the data transmission based at least in part on neighboring communications; and

identify the second transmit power for the data transmission based at least in part on the identified threshold power.

18. The apparatus of claim 17 , wherein the neighboring communications are associated with a higher priority than the data transmission.

19. The apparatus of claim 16 , wherein the processor and memory are further configured to:

identify, in the CTS message, channel quality information (CQI) associated with the RTS message; and

the processor and memory are configured to identify the second transmit power for the data transmission based at least in part on the ON.

20. The apparatus of claim 16 , wherein the processor and memory are further configured to:

identify a modulation and coding scheme (MCS) for the data transmission; and

identify the second transmit power for the data transmission based at least in part on the MCS.

21. The apparatus of claim 20 , wherein the data transmission comprises a portion of a larger data transmission.

22. The apparatus of claim 16 , wherein the second transmit power is less than the first transmit power.

23. The apparatus of claim 16 , wherein the wireless communications system comprises a millimeter wave (mmW) system or a sub6 GHz system.

24. An apparatus for wireless communication in a wireless communications system; comprising:

a processor;

memory in electronic communication with the processor; and

the processor and memory configured to:

receive a request to send (RTS) message from a transmitting device over a sidelink connection with the transmitting device, the RTS message transmitted by the transmitting device with a first transmit power;

transmit a clear to send (CTS) message to the transmitting device based at least in part on receiving the RTS message, wherein the CTS message is transmitted with a power that is inversely proportional to a power associated with the RTS message; and

receive a data transmission from the transmitting device over the sidelink connection with the transmitting device; the data transmission transmitted by the transmitting device with a second transmit power that is different from the first transmit power.

25. The apparatus of claim 24 , wherein the processor and memory are further configured to:

determine channel quality information (CQI) based at least in part on the RTS message; and

transmit the CQI in the CTS message to the transmitting device.

26. The apparatus of claim 24 , wherein the CTS message comprises an indication of a priority of the data transmission.

27. The apparatus of claim 24 , wherein the second transmit power is less than the first transmit power.

28. The apparatus of claim 24 , wherein the wireless communications system comprises a millimeter wave (mmW) system or a sub6 GHz system.