Messaging for unmanned aerial vehicle sidelink communications

1. A method of wireless communication performed by a first user equipment (UE), comprising:

establishing a PC5 unicast link with a second UE; and

transmitting, to the second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the first UE is an unmanned aerial vehicle (UAV), wherein the PC5 RRC message is a PC5 RRC UE capability enquiry message.

2. The method of claim 1 , wherein transmitting the capability information comprises:

transmitting the PC5 RRC message including the capability information to the second UE during establishment of the PC5 unicast link with the second UE.

3. The method of claim 1 , wherein the PC5 RRC UE capability enquiry message includes, in a list of frequency bands, a dedicated UAV spectrum.

4. The method of claim 1 , further comprising:

receiving, from the second UE, a PC5 RRC UE capability information message that includes an indication of whether the second UE is a UAV.

5. The method of claim 4 , wherein the PC5 RRC UE capability information message further includes an indication of an access stratum release supported by the second UE.

6. A method of wireless communication performed by a first user equipment (UE), comprising:

establishing a PC5 unicast link with a second UE, and

transmitting, to the second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the first UE is an unmanned aerial vehicle (UAV), wherein the PC5 RRC message is a PC5 RRC UE capability information message, and transmitting the capability information comprises:

transmitting the PC5 RRC UE capability information message to the second UE based at least in part on receiving a PC5 RRC UE capability enquiry message from the second UE.

7. The method of claim 6 , wherein the PC5 RRC UE capability information message includes, in a list of supported frequency band combinations, a dedicated UAV spectrum.

8. The method of claim 1 , further comprising:

transmitting, to the second UE, sidelink control information (SCI) relating to a PC5 unicast communication or a PC5 groupcast communication, wherein the SCI includes information relating to a height of the first UE.

9. The method of claim 8 , wherein the SCI includes a three-dimensional (3D) zone identifier associated with a location of the first UE.

10. The method of claim 8 , wherein the SCI includes a two-dimensional (2D) zone identifier associated with a location of the first UE and at least one of an indication of the height of the first UE or a vertical zone ID based on the height of the first UE.

11. A method of wireless communication performed by a first user equipment (UE), comprising:

establishing a PC5 unicast link with a second UE;

transmitting, to the second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the first UE is an unmanned aerial vehicle (UAV); and

transmitting, to the second UE in a PC5 RRC master information block message, an indication of a UAV status that indicates whether the first UE is on ground or in air.

12. A method of wireless communication performed by a first user equipment (UE), comprising:

establishing a PC5 unicast link with a second UE;

transmitting, to the second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the first UE is an unmanned aerial vehicle (UAV);

receiving, from the second UE, a PC5 RRC reconfiguration message that includes a request for flying information; and

transmitting, to the second UE and based at least in part on receiving the PC5 RRC reconfiguration message, a PC5 RRC reconfiguration complete message that includes a flying information for the first UE, wherein the flying information includes at least one of a speed, direction, or elevation of the first UE.

13. The method of claim 1 , further comprising:

transmitting, to the second UE, a PC5 RRC measurement report message that includes a height report for the first UE.

14. The method of claim 13 , wherein the height report includes an indication of a height of the first UE relative to a ground.

15. A method of wireless communication performed by a first user equipment (UE), comprising:

establishing a PC5 unicast link with a second UE,

transmitting, to the second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the first UE is an unmanned aerial vehicle (UAV), and

transmitting, to the second UE, a PC5 RRC measurement report message that includes a height report for the first UE, wherein the height report includes an indication of a height of the first UE relative to the second UE.

16. A method of wireless communication performed by a first user equipment (UE), comprising:

receiving, from a second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the second UE is an unmanned aerial vehicle (UAV);

receiving, from the second UE, sidelink control information (SCI) associated with a sidelink communication from the second UE, wherein the SCI includes information relating to a height of the second UE; and

transmitting, to the second UE, hybrid automatic repeat request (HARQ) feedback for the sidelink communication based at least in part on a distance between the first UE and the second UE determined using the information relating to the height of the second UE.

17. The method of claim 16 , wherein the SCI includes a three-dimensional (3D) zone identifier associated with a location of the second UE.

18. The method of claim 16 , wherein the SCI includes a two-dimensional (2D) zone identifier associated with a location of the second UE and at least one of an indication of the height of the first UE or a vertical zone ID based on the height of the first UE.

19. The method of claim 16 , wherein the SCI includes an indication of a minimum communication range (MCR) associated with the second UE, and transmitting the HARQ feedback for the sidelink communication comprises:

transmitting, to the second UE, the HARQ feedback for the sidelink communication based at least in part on a determination of whether the distance between the first UE and the second UE is within the MCR associated with the second UE.

20. A first user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors, operatively coupled to the memory, configured to:

establish a PC5 unicast link with a second UE; and

transmit, to the second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the first UE is an unmanned aerial vehicle (UAV), wherein the PC5 RRC message is a PC5 RRC UE capability enquiry message.

21. A first user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors, operatively coupled to the memory, configured to:

establish a PC5 unicast link with a second UE; and

transmit, to the second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the first UE is an unmanned aerial vehicle (UAV), wherein the PC5 RRC message is a PC5 RRC UE capability information message; and

transmit the PC5 RRC UE capability information message to the second UE based at least in part on receiving a PC5 RRC UE capability enquiry message from the second UE.

22. The first UE of claim 20 , wherein the one or more processors are further configured to:

transmit, to the second UE, sidelink control information (SCI) relating to a PC5 unicast communication or a PC5 groupcast communication, wherein the SCI includes information relating to a height of the first UE.

23. The first UE of claim 22 , wherein the SCI includes a three-dimensional (3D) zone identifier associated with a location of the first UE.

24. The first UE of claim 22 , wherein the SCI includes a two-dimensional (2D) zone identifier associated with a location of the first UE and an indication of the height of the first UE.

25. A first user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors, operatively coupled to the memory, configured to:

establish a PC5 unicast link with a second UE; and

transmit, to the second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the first UE is an unmanned aerial vehicle (UAV); and

transmit, to the second UE in a PC5 RRC master information block message, an indication of a UAV status that indicates whether the first UE is on ground or in air.

26. A first user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors, operatively coupled to the memory, configured to:

establish a PC5 unicast link with a second UE; and

transmit, to the second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the first UE is an unmanned aerial vehicle (UAV);

receive, from the second UE, a PC5 RRC reconfiguration message that includes a request for flying information; and

transmit, to the second UE and based at least in part on receiving the PC5 RRC reconfiguration message, a PC5 RRC reconfiguration complete message that includes a flying information for the first UE, wherein the flying information includes at least one of a speed, direction, or elevation of the first UE.

27. The first UE of claim 20 , wherein the one or more processors are further configured to:

transmit, to the second UE, a PC5 RRC measurement report message that includes a height report for the first UE.

28. A first user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors, operatively coupled to the memory, configured to:

receive, from a second UE in a PC5 radio resource control (RRC) message, capability information that includes an indication that the second UE is an unmanned aerial vehicle (UAV);

receive, from the second UE, sidelink control information (SCI) associated with a sidelink communication from the second UE, wherein the SCI includes information relating to a height of the second UE; and

transmit, to the second UE, hybrid automatic repeat request (HARQ) feedback for the sidelink communication based at least in part on a distance between the first UE and the second UE determined using the information relating to the height of the second UE.

29. The first UE of claim 28 , wherein the SCI includes a three-dimensional (3D) zone identifier associated with a location of the second UE.

30. The first UE of claim 28 , wherein the SCI includes a two-dimensional (2D) zone identifier associated with a location of the second UE and at least one of an indication of the height of the first UE or a vertical zone ID based on the height of the first UE.

31. The first UE of claim 28 , wherein the SCI includes an indication of a minimum communication range (MCR) associated with the second UE, and wherein that one or more processors are further configured to:

transmit, to the second UE, the HARQ feedback for the sidelink communication based at least in part on a determination of whether the distance between the first UE and the second UE is within the MCR associated with the second UE.