Superposition of sidelink and uplink transmissions

1. A method for wireless communications by a first user equipment (UE), comprising:

receiving, from a network device, control signaling indicating a sidelink resource pool allocated for sidelink communication between the first UE and a second UE;

transmitting, by the first UE, an indication that indicates superposition coding is being used or that indicates an intent to use superposition coding to generate a concurrent sidelink and uplink transmission; and

transmitting the concurrent sidelink and uplink transmission within a resource of the sidelink resource pool and in accordance with the superposition coding based at least in part on the indication.

2. The method of claim 1 , wherein transmitting the concurrent sidelink and uplink transmission comprises:

transmitting the concurrent sidelink and uplink transmission based at least in part on a sidelink transmission encoded as a base layer of the concurrent sidelink and uplink transmission.

3. The method of claim 1 , wherein transmitting the concurrent sidelink and uplink transmission comprises:

transmitting the concurrent sidelink and uplink transmission based at least in part on an uplink transmission encoded as an enhancement layer of the concurrent sidelink and uplink transmission.

4. The method of claim 1 , wherein transmitting the indication comprises:

transmitting sidelink control information that includes the indication and indicates the resource of the sidelink resource pool.

5. The method of claim 1 , wherein transmitting the indication comprises:

transmitting sidelink control information that indicates the resource of the sidelink resource pool as at least one upcoming time and frequency resource within the sidelink resource pool.

6. The method of claim 1 , wherein transmitting the indication comprises:

transmitting the indication that indicates at least one upcoming time and frequency resource within the sidelink resource pool to implicitly be an uplink reservation request.

7. The method of claim 1 , wherein transmitting the indication comprises:

transmitting sidelink control information that includes an uplink reservation request for the resource of the sidelink resource pool.

8. The method of claim 7 , further comprising:

receiving a grant for uplink transmission via the resource of the sidelink resource pool based at least in part on the uplink reservation request.

9. The method of claim 1 , further comprising:

transmitting control information indicating at least one transmission parameter for the concurrent sidelink and uplink transmission, wherein the concurrent sidelink and uplink transmission is transmitted in accordance with at least one transmission layer parameter.

10. The method of claim 1 , further comprising:

transmitting control information indicating at least one transmission parameter that is a power split parameter between an uplink transmission of the concurrent sidelink and uplink transmission and a sidelink transmission of the concurrent sidelink and uplink transmission.

11. The method of claim 1 , further comprising:

transmitting control information indicating at least one transmission parameter that is a first modulation and coding scheme parameter for an uplink transmission of the concurrent sidelink and uplink transmission and a second modulation and coding scheme parameter for a sidelink transmission of the concurrent sidelink and uplink transmission.

12. The method of claim 1 , further comprising:

receiving a reference signal from the network device, wherein the indication is transmitted based at least in part on a measurement of the reference signal.

13. The method of claim 1 , further comprising:

determining a sidelink path quality metric and an uplink path quality metric, wherein the indication is transmitted based at least in part on the sidelink path quality metric and the uplink path quality metric.

14. The method of claim 1 , further comprising:

receiving a control message from the network device indicating a capability of the network device to support the superposition coding; and

transmitting the indication that indicates the superposition coding is being used or that indicates the intent to use the superposition coding to generate the concurrent sidelink and uplink transmission based at least in part on the control message.

15. A method for wireless communications by a network device, comprising:

transmitting, to a first user equipment (UE), control signaling indicating a sidelink resource pool allocated for sidelink communication between the first UE and a second UE;

receiving, from the first UE, an indication that indicates superposition coding is being used or that indicates an intent to use superposition coding to generate a concurrent sidelink and uplink transmission; and

receiving the concurrent sidelink and uplink transmission within a resource of the sidelink resource pool and in accordance with the superposition coding based at least in part on the indication.

16. The method of claim 15 , wherein receiving the concurrent sidelink and uplink transmission comprises:

receiving the concurrent sidelink and uplink transmission based at least in part on a sidelink transmission encoded as a base layer of the concurrent sidelink and uplink transmission.

17. The method of claim 15 , wherein receiving the concurrent sidelink and uplink transmission comprises:

receiving the concurrent sidelink and uplink transmission based at least in part on an uplink transmission encoded as an enhancement layer of the concurrent sidelink and uplink transmission.

18. The method of claim 15 , wherein receiving the indication comprises:

receiving sidelink control information that includes the indication and indicates the resource of the sidelink resource pool.

19. The method of claim 15 , wherein receiving the indication comprises:

receiving sidelink control information that indicates the resource of the sidelink resource pool as at least one upcoming time and frequency resource within the sidelink resource pool.

20. The method of claim 15 , wherein receiving the indication comprises:

receiving the indication that indicates at least one upcoming time and frequency resource within the sidelink resource pool to implicitly be an uplink reservation request.

21. The method of claim 15 , wherein receiving the indication comprises:

receiving sidelink control information that includes an uplink reservation request for the resource of the sidelink resource pool.

22. The method of claim 21 , further comprising:

transmitting a grant for uplink transmission via the resource of the sidelink resource pool based at least in part on the uplink reservation request.

23. The method of claim 15 , further comprising:

receiving control information indicating at least one transmission parameter for the concurrent sidelink and uplink transmission, wherein the concurrent sidelink and uplink transmission is received in accordance with at least one transmission layer parameter.

24. The method of claim 23 , wherein receiving the control information comprises:

performing, based at least in part on the control information, base layer cancellation from the concurrent sidelink and uplink transmission to obtain an enhancement layer of the concurrent sidelink and uplink transmission.

25. The method of claim 15 , further comprising:

receiving control information indicating at least one transmission parameter that is a power split parameter between an uplink transmission of the concurrent sidelink and uplink transmission and a sidelink transmission of the concurrent sidelink and uplink transmission.

26. The method of claim 15 , further comprising:

receiving control information indicating at least one transmission parameter that is a first modulation and coding scheme parameter for an uplink transmission of the concurrent sidelink and uplink transmission and a second modulation and coding scheme parameter for a sidelink transmission of the concurrent sidelink and uplink transmission.

27. The method of claim 15 , further comprising:

transmitting a reference signal, wherein the indication is received based at least in part on a measurement of the reference signal.

28. The method of claim 15 , further comprising:

transmitting a control message to the UE indicating a capability of the network device to support the superposition coding; and

receiving the indication that indicates the superposition coding is being used or that indicates the intent to use the superposition coding to generate the concurrent sidelink and uplink transmission based at least in part on the control message.

29. An apparatus for wireless communications by a first user equipment (UE), comprising:

a processor;

a transceiver,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

receive, from a network device, control signaling indicating a sidelink resource pool allocated for sidelink communication between the first UE and a second UE;

transmit, via the transceiver of the first UE, an indication that indicates superposition coding is being used or that indicates an intent to use superposition coding to generate a concurrent sidelink and uplink transmission; and

transmit the concurrent sidelink and uplink transmission within a resource of the sidelink resource pool and in accordance with the superposition coding based at least in part on the indication.

30. An apparatus for wireless communications by a network device, comprising:

a processor;

a transceiver,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

transmit, via the transceiver, to a first user equipment (UE), control signaling indicating a sidelink resource pool allocated for sidelink communication between the first UE and a second UE;

receive, from the first UE, an indication that indicates superposition coding is being used or that indicates an intent to use superposition coding to generate a concurrent sidelink and uplink transmission; and

receive the concurrent sidelink and uplink transmission within a resource of the sidelink resource pool and in accordance with the superposition coding based at least in part on the indication.