Superposition transmission of sidelink and uplink

1. A method of sidelink wireless communication at a first wireless communication device, the method comprising:

communicating with a base station over a first link and a second wireless communication device over a second link on a common carrier shared between the first link and the second link;

receiving a grant from the base station comprising an indication of resources on the common carrier for a superposition transmission comprising a base layer corresponding to an uplink signal to be transmitted to the base station and an enhanced layer corresponding to a sidelink signal to be transmitted to at least the second wireless communication device, wherein the grant is included within downlink control information (DCI) received from the base station;

transmitting interference assistance information associated with the base layer to the second wireless communication device, the interference assistance information comprising a first modulation and coding scheme (MCS) used for the uplink signal, wherein the first MCS is included within the DCI; and

transmitting the superposition transmission comprising the base layer and the enhanced layer to the base station and the second wireless communication device based on a power split factor included within the DCI.

2. The method of claim 1 , further comprising:

determining a total power budget for the superposition transmission; and

applying the power split factor to the total power budget to generate the base layer at a first power and the enhanced layer at a second power.

3. The method of claim 2 , wherein the applying the power split factor further comprises:

multiplying the power split factor by the total power budget to determine the first power at which to generate the base layer; and

multiplying the total power budget by a difference between one and the power split factor to determine the second power at which to generate the enhanced layer.

4. The method of claim 2 , further comprising:

receiving closed loop power control parameters and open loop power control parameters for the superposition transmission, wherein at least one of the open loop power control parameters comprises an updated open loop power control parameter updated for the superposition transmission; and

determining the total power budget based on the closed loop power control parameters and the open loop power control parameters.

5. The method of claim 2 , further comprising:

receiving a second MCS associated with the sidelink signal from the base station;

generating the uplink signal utilizing the first MCS at the first power to produce the base layer;

generating the sidelink signal utilizing the second MCS at the second power to produce the enhanced layer; and

superimposing the enhanced layer on the base layer to produce the superposition transmission.

6. The method of claim 5 , wherein the transmitting the interference assistance information further comprises:

transmitting the interference assistance information comprising the first MCS and the power split factor to the second wireless communication device.

7. The method of claim 6 , wherein the transmitting the interference assistance information further comprises:

transmitting sidelink control information (SCI) comprising the interference assistance information and the second MCS to the second wireless communication device.

8. The method of claim 6 , wherein the transmitting the interference assistance information further comprises:

transmitting the interference assistance information separate from sidelink control information comprising the second MCS to the second wireless communication device.

9. The method of claim 5 , wherein the second MCS is included within the DCI.

10. The method of claim 1 , further comprising:

transmitting a capability indication to the base station indicating a capability of the first wireless communication device to perform the superposition transmission.

11. The method of claim 1 , further comprising:

transmitting a scheduling request to the base station requesting the grant for the superposition transmission.

12. The method of claim 11 , wherein the transmitting the scheduling request further comprises:

transmitting the scheduling request comprising at least one of a sidelink packet priority of the sidelink signal, a buffer status report, or a sidelink quality.

13. The method of claim 12 , further comprising:

measuring an average sidelink path loss associated with the second link over a window of time, wherein the sidelink quality comprises the average sidelink path loss.

14. The method of claim 1 , wherein the sidelink signal comprises a broadcast sidelink signal broadcast to a plurality of sidelink devices comprising the second wireless communication device.

15. A first wireless communication device in a wireless communication network, comprising:

a wireless transceiver;

a memory; and

a processor coupled to the wireless transceiver and the memory, wherein the processor is configured to:

communicate with a base station over a first link and a second wireless communication device over a second link on a common carrier shared between the first link and the second link via the wireless transceiver;

receive a grant from the base station comprising an indication of resources on the common carrier for a superposition transmission comprising a base layer corresponding to an uplink signal to be transmitted to the base station and an enhanced layer corresponding to a sidelink signal to be transmitted to at least the second wireless communication device, wherein the grant is included within downlink control information (DCI) received from the base station;

transmit interference assistance information associated with the base layer to the second wireless communication device via the wireless transceiver, the interference assistance information comprising a first modulation and coding scheme (MCS) used for the uplink signal, wherein the first MCS is included within the DCI; and

transmit the superposition transmission comprising the base layer and the enhanced layer to the base station and the second wireless communication device via the wireless transceiver based on a power split factor included within the DCI.

16. The first wireless communication device of claim 15 , wherein the processor is further configured to:

determine a total power budget for the superposition transmission; and

apply the power split factor to the total power budget to generate the base layer at a first power and the enhanced layer at a second power.

17. The first wireless communication device of claim 16 , wherein the processor is further configured to:

multiply the power split factor by the total power budget to determine the first power at which to generate the base layer; and

multiply the total power budget by a difference between one and the power split factor to determine the second power at which to generate the enhanced layer.

18. The first wireless communication device of claim 16 , wherein the processor is further configured to:

receive closed loop power control parameters and open loop power control parameters for the superposition transmission, wherein at least one of the open loop power control parameters comprises an updated open loop power control parameter updated for the superposition transmission; and

determine the total power budget based on the closed loop power control parameters and the open loop power control parameters.

19. The first wireless communication device of claim 16 , wherein the processor is further configured to:

receiving a second MCS associated with the sidelink signal from the base station;

generating the uplink signal utilizing the first MCS at the first power to produce the base layer;

generating the sidelink signal utilizing the second MCS at the second power to produce the enhanced layer; and

superimposing the enhanced layer on the base layer to produce the superposition transmission.

20. The first wireless communication device of claim 19 , wherein the processor is further configured to:

transmit the interference assistance information comprising the first MCS and the power split factor to the second wireless communication device.

21. The first wireless communication device of claim 20 , wherein the processor is further configured to:

transmit sidelink control information (SCI) comprising the interference assistance information and the second MCS to the second wireless communication device.

22. The first wireless communication device of claim 20 , wherein the processor is further configured to:

transmit the interference assistance information separate from sidelink control information comprising the second MCS to the second wireless communication device.

23. The first wireless communication device of claim 19 , wherein the second MCS is included within the DCI.