Superposition transmission techniques in sidelink communications

A method for wireless communications at a transmitting user equipment (UE), comprising:

• transmitting, to one or more receiving UEs, an indication that superposition coding is used to concurrently transmit a sidelink base layer transmission and a sidelink enhancement layer transmission in a sidelink communication from the transmitting UE;
• transmitting, to the one or more receiving UEs, one or more stage-two sidelink control information transmissions that provide one or more parameters for one or more of the sidelink base layer transmission or the sidelink enhancement layer transmission;
• encoding, based at least in part on the one or more parameters, the sidelink base layer transmission and the sidelink enhancement layer transmission into the sidelink communication;
• and
• transmitting the sidelink communication to the one or more receiving UEs.

An apparatus for wireless communications at a first user equipment (UE), comprising:

• a processor;
• memory coupled with the processor, the memory and processor configured to:
• receive, from a transmitting UE, an indication that superposition coding is used to concurrently transmit a sidelink base layer transmission and a sidelink enhancement layer transmission in a sidelink communication from the transmitting UE;
• receive, based at least in part on the indication, one or more stage-two sidelink control information transmissions that provide one or more parameters for one or more of the sidelink base layer transmission or the sidelink enhancement layer transmission;
• and
• decoding, base at least in part on the one or more parameters, one or more of the sidelink base layer transmission or the sidelink enhancement layer transmission.

An apparatus for wireless communications at a transmitting user equipment (UE), comprising:

• a processor;
• memory coupled with the processor, the memory and processor configured to:
• transmit, to one or more receiving UEs, an indication that superposition coding is used to concurrently transmit a sidelink base layer transmission and a sidelink enhancement layer transmission in a sidelink communication from the transmitting UE;
• transmit, to the one or more receiving UEs, one or more stage-two sidelink control information transmissions that provide one or more parameters for one or more of the sidelink base layer transmission or the sidelink enhancement layer transmission;
• encode, based at least in part on the one or more parameters, the sidelink base layer transmission and the sidelink enhancement layer transmission into the sidelink communication;
• and
• transmit the sidelink communication to the one or more receiving UEs.