Latency minimization for retransmissions in communications systems with multi-level coding and multi-level sequential demodulation and decoding and code block grouping from different component codes

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

• transmitting, to a user equipment (UE) in a first transmission time interval, a code block group comprising a plurality of code blocks associated with a plurality of codewords, wherein each codeword of the plurality of codewords is associated with one of a plurality of decoding levels of a decoding procedure for the code block group, a first set of code blocks of the plurality of code blocks are associated with a first codeword of the plurality of codewords, and a second set of code blocks of the plurality of code blocks are associated with a second codeword of the plurality of codewords;
• receiving, from the UE, a feedback message comprising an indicator that the decoding procedure was unsuccessful for at least one of the first set of code blocks or the second set of code blocks;
• and
• transmitting, to the UE in a second transmission time interval and based at least in part on the received feedback message, a retransmission of the code block group comprising both the first set of code blocks and the second set of code blocks.

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

• at least one processor,
• memory coupled to the at least one processor;
• and
• instructions stored in the memory and executable by the at least one processor to cause the UE to:
• receive, from a base station in a first transmission time interval, a code block group comprising a plurality of code blocks associated with a plurality of codewords, each codeword of the plurality of codewords associated with one of a plurality of decoding levels of a decoding procedure for the code block group;
• determine that the decoding procedure associated with at least one of a first set of code blocks of the plurality of code blocks or a second set of code blocks of the plurality of code blocks is unsuccessful, wherein the first set of code blocks are associated with a first codeword, and the second set of code blocks are associated with a second codeword;
• transmit, to the base station, a feedback message comprising an indicator that the decoding procedure was unsuccessful for the code block group based at least in part on the determining that the decoding procedure associated with at least one of the first set of code blocks or the second set of code blocks is unsuccessful;
• and
• receive, from the base station in a second transmission time interval and based at least in part on the transmitted feedback message, a retransmission of the code block group comprising both the first set of code blocks and the second set of code blocks.

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

• at least one processor,
• memory coupled to the at least one processor;
• and
• instructions stored in the memory and executable by the at least one processor to cause the base station to:
• transmit, to a user equipment (UE) in a first transmission time interval, a code block group comprising a plurality of code blocks associated with a plurality of codewords, wherein each codeword of the plurality of codewords is associated with one of a plurality of decoding levels of a decoding procedure for the code block group, a first set of code blocks of the plurality of code blocks are associated with a first codeword of the plurality of codewords, and a second set of code blocks of the plurality of code blocks are associated with a second codeword of the plurality of codewords;
• receive, from the UE, a feedback message comprising an indicator that the decoding procedure was unsuccessful for at least one of the first set of code blocks or the second set of code blocks;
• and
• transmit, to the UE in a second transmission time interval and based at least in part on the received feedback message, a retransmission of the code block group comprising both the first set of code blocks and the second set of code blocks.