Downlink retransmission under unreliable code block group (CBG) level ACK/NACK feedback

A method of wireless communication by a Base Station (BS), comprising:

• receiving, from a User Equipment (UE), feedback indicating an Acknowledgement (ACK) or a Negative Acknowledgement (NACK) corresponding to each of received set of code block groups (CBGs) transmitted by the BS;
• transmitting an indication including information regarding whether the feedback was correctly decoded at the BS;
• and
• retransmitting one or more of the CBGs based on the transmitted indication.

An apparatus for wireless communication by a User Equipment (UE), comprising:

• means for transmitting to a base station (BS), feedback indicating an Acknowledgement (ACK) or a Negative Acknowledgement (NACK) corresponding to each of received set of code block groups (CBGs) transmitted by the BS to the UE;
• means for receiving an indication including information regarding whether the feedback was correctly decoded at the BS;
• and
• means for processing a retransmission of one or more of the CBGs based on the received indication.

An apparatus for wireless communication by a Base Station (BS), comprising:

• means for receiving, from a User Equipment (UE), feedback indicating an Acknowledgement (ACK) or a Negative Acknowledgement (NACK) corresponding to each of received set of code block groups (CBGs) transmitted by the BS;
• means for transmitting an indication including information regarding whether the feedback was correctly decoded at the BS;
• and
• means for retransmitting one or more of the CBGs based on the transmitted indication.

A method for wireless communication by a User Equipment (UE), comprising:

• transmitting to a base station (BS), feedback indicating an Acknowledgement (ACK) or a Negative Acknowledgement (NACK) corresponding to each of received set of code block groups (CBGs) transmitted by the BS to the UE;
• receiving retransmission of one or more of the CBGs based on the feedback;
• receiving an indication to reset collection of Log Likelihood Ratios (LLRs) for at least one of the retransmitted CBGs;
• and
• processing the retransmission based on the indication.

A method of wireless communication by a Base Station (BS), comprising:

• receiving, from a User Equipment (UE), feedback indicating an Acknowledgement (ACK) or a Negative Acknowledgement (NACK) corresponding to each of received set of code block groups (CBGs) transmitted by the BS;
• retransmitting one or more of the CBGs based on the feedback;
• determining that data corresponding to one or more of the CBGs transmitted by the BS was punctured by other data;
• and
• in response to the determination, transmitting an indication to reset collection of Log Likelihood Ratios (LLRs) at the UE for at least one of the retransmitted CBGs.