Multicast radio bearer (mrb) with radio link control (rlc) re-transmission

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

• a processor;
• a memory coupled with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• receive, from a base station, multicast data via a multicast channel;
• transmit, to the base station, multicast feedback based on receiving the multicast data, the UE associated with a set of UEs, the set of UEs associated with a multicast transmission of the multicast data from the base station;
• and
• receive, from the base station, a re-transmission of the multicast data on the multicast channel or a unicast channel based on one or more of a number of UEs served by the base station, a number of multicast feedback transmissions from the set of UEs, or a radio channel condition.

A method for wireless communication at a base station, comprising:

• transmitting, to a set of user equipment (UEs), multicast data via a multicast channel;
• receiving, from one or more UEs of the set of UEs, multicast feedback associated with a first access stratum layer, the feedback being received based on transmitting the multicast data;
• and
• re-transmitting, to the one or more UEs of the set of UEs, the multicast data on the multicast channel or a unicast channel based on one or more of a number of UEs served by the base station, a number of multicast feedback transmissions from the set of UEs, or a radio channel condition, the multicast channel or the unicast channel being selected at a second access stratum layer based on identifying the first access stratum layer.

An apparatus for wireless communications at a base station, comprising:

• a processor;
• a memory coupled with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• transmit, to a set of user equipment (UEs), multicast data via a multicast channel;
• receive, from one or more UEs of the set of UEs, multicast feedback associated with a first access stratum layer, the feedback being received based on transmitting the multicast data;
• and
• re-transmit, to the one or more UEs of the set of UEs, the multicast data on the multicast channel or a unicast channel based on one or more of a number of UEs served by the base station, a number of multicast feedback transmissions from the set of UEs, the multicast channel or the unicast channel being selected at a second access stratum layer based on identifying the first access stratum layer.