Techniques for determining resource assignments for decode and forward relaying via downlink control information

A method for wireless communication at a second user equipment (UE), comprising:

• receiving, from a base station, a first groupcast downlink control information message including a first grant for a first set of resources for a first UE for a first data transmission from the first UE and a second grant for a second set of resources for the second UE for a second data transmission from the second UE;
• transmitting, to the first UE over a resource assigned for feedback, a positive acknowledgment associated with the first data transmission from the first UE;
• receiving, from the base station over a first downlink resource assigned for feedback, a negative acknowledgment associated with the second data transmission from the second UE;
• receiving, from the base station, a second groupcast downlink control information message based at least in part on transmitting the positive acknowledgment to the first UE and receiving the negative acknowledgment from the base station;
• determining a resource assignment for a retransmission of the second data transmission based at least in part on a type of the second groupcast downlink control information message;
• and
• transmitting, to the base station, the retransmission of the second data transmission based at least in part on the resource assignment.

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

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, from a base station, a first groupcast downlink control information message including a first grant for a first set of resources for the first UE for a first data transmission from the first UE and a second grant for a second set of resources for a second UE for a second data transmission from the second UE;
• receive, from the base station over a first downlink resource assigned for feedback, a negative acknowledgment associated with the first data transmission from the first UE and, from the second UE over a resource assigned for feedback, a positive acknowledgment associated with the first data transmission from the first UE;
• receive, from the base station, a second groupcast downlink control information message based at least in part on receiving the negative acknowledgment from the base station and the positive acknowledgment from the second UE;
• determine a resource assignment for one or more of a retransmission of the first data transmission or a third data transmission based at least in part on a type of the second groupcast downlink control information message;
• and
• transmit, to one or both of the second UE or the base station, the retransmission of the first data transmission or the third data transmission based at least in part on the resource assignment.

An apparatus for wireless communication at a second user equipment (UE), comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, from a base station, a first groupcast downlink control information message including a first grant for a first set of resources for a first UE for a first data transmission from the first UE and a second grant for a second set of resources for the second UE for a second data transmission from the second UE;
• transmit, to the first UE over a resource assigned for feedback, a positive acknowledgment associated with the first data transmission from the first UE;
• receive, from the base station over a first downlink resource assigned for feedback, a negative acknowledgment associated with the second data transmission from the second UE;
• receive, from the base station, a second groupcast downlink control information message based at least in part on transmitting the positive acknowledgment to the first UE and receiving the negative acknowledgment from the base station;
• determine a resource assignment for a retransmission of the second data transmission based at least in part on a type of the second groupcast downlink control information message;
• and
• transmit, to the base station, the retransmission of the second data transmission based at least in part on the resource assignment.