Superposition transmission of sidelink and uplink

1. A method of wireless communication comprising:

receiving, by a user equipment (UE), a downlink control signaling scheduling one or more uplink transmissions in one or more transmission resources;

determining, by the UE, to perform superposition transmission operations for at least one transmission resource of the one or more transmission resources;

transmitting, by the UE, a sidelink channel control transmission indicating a superposition transmission responsive to determining to perform superposition transmission operations for the at least one transmission resource; and

transmitting, by the UE, an uplink channel data transmission and a sidelink channel data transmission in a same transmission resource of the one or more transmission resources, responsive to the sidelink channel control transmission.

2. The method of claim 1 , wherein the uplink channel data transmission and the sidelink channel data transmission comprise the superposition transmission.

3. The method of claim 1 , wherein an uplink channel corresponding to the uplink channel data transmission has a higher transmission power than a transmission power of a sidelink channel corresponding to the sidelink channel data transmission.

4. The method of claim 1 , wherein the sidelink channel data transmission is scheduled by the UE.

5. The method of claim 1 , further comprising:

determining to schedule, by the UE, the sidelink channel data transmission in one or multiple of the one or more transmission resources, and wherein transmitting the sidelink channel control transmission includes:

transmitting, by the UE, the sidelink channel control transmission scheduling the superposition transmission.

6. The method of claim 5 , wherein the sidelink channel control transmission is transmitted in a sidelink channel resource.

7. The method of claim 1 , wherein the uplink channel data transmission and the sidelink channel data transmission are transmitted in an uplink channel resource.

8. The method of claim 1 , wherein the uplink channel data transmission and the sidelink channel data transmission are scheduled by a network entity.

9. The method of claim 1 , further comprising:

transmitting, by the UE, an uplink channel control transmission indicating that the UE requests to use superposition transmission; and

receiving, by the UE, a second downlink control signaling scheduling the uplink channel data transmission and the sidelink channel data transmission.

10. The method of claim 9 , wherein transmitting the sidelink channel control transmission includes:

transmitting, by the UE, the sidelink channel control transmission indicating the uplink channel data transmission and the sidelink channel data transmission comprise the superposition transmission.

11. An apparatus configured for wireless communication, comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to:

receive, by a user equipment (UE), a downlink control signaling scheduling one or more uplink transmissions for one or more transmission resources;

determine, by the UE, to perform superposition transmission operations for at least one transmission resource of the one or more transmission resources;

transmit, by the UE, a sidelink channel control transmission indicating a superposition transmission responsive to determining to perform superposition transmission operations for the at least one transmission resource; and

transmit, by the UE, an uplink channel data transmission and a sidelink channel data transmission in a same transmission resource of the one or more transmission resources, responsive to the sidelink channel control transmission.

12. The apparatus of claim 11 , wherein the uplink channel data transmission and the sidelink channel data transmission are transmitted in a sidelink channel resource.

13. The apparatus of claim 11 , wherein determining to perform the superposition transmission operations includes:

determining, by the UE, that the UE has both uplink and sidelink traffic to send; and

determining, by the UE, that a difference of transmission powers for uplink and sidelink channels is greater than a threshold, the uplink channel corresponding to the uplink channel data transmission and the sidelink channel corresponding to the sidelink channel data transmission.

14. The apparatus of claim 13 , wherein determining to perform the superposition transmission operations further includes:

determining that the sidelink traffic, the uplink traffic, or both, may be transmitted in an uplink resource.

15. The apparatus of claim 13 , wherein determining to perform the superposition transmission operations further includes:

determining that the sidelink traffic, the uplink traffic, or both, may be transmitted in a sideline resource of a sidelink resource pool.

16. The apparatus of claim 13 , wherein determining that transmission powers for the uplink and sidelink channels are different includes:

determining, by the UE, a uplink transmit power for the uplink channel;

determining, by the UE, a sidelink transmit power for the sidelink channel;

determining, by the UE, a transmit power difference based on the uplink transmit power and the sidelink transmit power; and

comparing the transmit power difference to a threshold to determine if the transmit power difference exceeds the threshold, wherein the UE determines to perform the superposition transmission operations based on the transmit power difference exceeding the threshold.

17. The apparatus of claim 11 , further comprising, prior to receiving the downlink control signaling, transmitting, by the UE, a capabilities message indicating that the UE is configured for superposition of sidelink and uplink transmissions.

18. The apparatus of claim 11 , further comprising, prior to receiving the downlink control signaling, receiving, by the UE from a second UE, a capabilities message indicating that the second UE is capable of superposition of sidelink and uplink transmissions.

19. The apparatus of claim 11 , further comprising, prior to receiving the downlink control signaling, receiving, by the UE, a configuration message from a network entity indicating a superposition of sidelink and uplink transmission mode.

20. A method of wireless communication comprising:

receiving, by a user equipment (UE) from a second UE, a sidelink channel control transmission indicating a superposition transmission;

determining, by the UE, to perform superposition transmission reception operations for at least one transmission resource based on the sidelink channel control transmission; and

receiving, by the UE, an uplink channel data transmission and a sidelink channel data transmission in a same transmission resource, responsive to determining to perform superposition transmission reception operations for the at least one transmission resource.

21. The method of claim 20 , wherein the sidelink channel control transmission indicates that the uplink channel data transmission and the sidelink channel data transmission comprise the superposition transmission.

22. The method of claim 20 , further comprising:

receiving, by the UE from a network entity, a downlink channel control transmission scheduling the uplink channel data transmission and the sidelink channel data transmission of the superposition transmission.

23. The method of claim 20 , further comprising:

receiving, by the UE from a network entity, a downlink channel control transmission indicating the uplink channel data transmission and the sidelink channel data transmission comprise the superposition transmission, wherein the sidelink channel control transmission schedules the uplink channel data transmission and the sidelink channel data transmission of the superposition transmission.

24. The method of claim 20 , wherein the sidelink channel control transmission further schedules the superposition transmission, and the method further comprising performing superposition transmission detection operations responsive to the sidelink channel control transmission.

25. An apparatus configured for wireless communication, comprising:

at least one processor; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to:

receive, by a user equipment (UE) from a second UE, a sidelink channel control transmission indicating a superposition transmission;

determine, by the UE, to perform superposition transmission reception operations for at least one transmission resource based on the sidelink channel control transmission; and

receive, by the UE, an uplink channel data transmission and a sidelink channel data transmission in a same transmission resource, responsive to determining to perform superposition transmission reception operations for the at least one transmission resource.

26. The apparatus of claim 25 , further comprising:

decoding the uplink channel data transmission; and

decoding the sidelink channel data transmission based on the decoding of the uplink channel data transmission.

27. The apparatus of claim 26 , wherein decoding the sidelink channel data transmission includes:

performing successive interference cancellation (SIC) on the sidelink channel data transmission based on the decoding of the uplink channel data transmission.

28. The method of claim 1 , wherein the sidelink channel control transmission is a scheduling transmission to schedule the superposition transmission and transmitted to another UE or is a scheduling request transmission including a request to schedule the superposition transmission and transmitted to a network entity.

29. The method of claim 1 , wherein determining to perform the superposition transmission operations further includes:

determining that the uplink channel data transmission and the sidelink channel data transmission may be transmitted in the same transmission resource based on transmission power, transmission distance, orthogonality, or a combination thereof.

30. The apparatus of claim 11 , wherein the UE determines to perform the superposition transmission operations independent of a notification from a network entity.