Latency minimization for retransmissions in communications systems with multi-level coding and multi-level sequential demodulation and decoding and code block grouping per decoding level

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

• transmitting a plurality of codeblock groups to a user equipment (UE) in a first time period, each codeblock group of the plurality of codeblock groups being associated with a respective one decoding level of a plurality of decoding levels of a multi-level sequential decoding procedure, wherein the plurality of codeblock groups are associated with same jointly shared channel resources occupied by a corresponding portion of multi-level coded and modulated transmission;
• receiving, from the UE, a feedback message that is based at least in part on a first outcome of the decoding procedure for a first codeblock group of the plurality of codeblock groups and a second outcome of the decoding procedure for a second codeblock group of the plurality of codeblock groups, wherein the second outcome for the second codeblock group is based at least in part on the first outcome for the first codeblock group, and the first codeblock group is associated with a lower decoding level than the second codeblock group;
• and
• transmitting, to the UE in a second time period and based at least in part on the received feedback message indicating that at least one of the first outcome or the second outcome is a failed decoding procedure, a retransmission of the plurality of codeblock groups associated with the corresponding jointly shared channel resources.

An apparatus for wireless communication at a 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 a plurality of codeblock groups from a base station in a first time period, each codeblock group of the plurality of codeblock groups being associated with a respective one decoding level of a plurality of decoding levels of a multi-level sequential decoding procedure, wherein the plurality of codeblock groups are associated with same jointly shared channel resources occupied by a corresponding portion of a multi-level coded and modulated transmission;
• determine a first outcome of the decoding procedure for a first codeblock group of the plurality of codeblock groups and a second outcome of the decoding procedure for a second codeblock group of the plurality of codeblock groups, wherein the second outcome for the second codeblock group is based at least in part on the first outcome for the first codeblock group, and the first codeblock group is associated with a lower decoding level than the second codeblock group;
• transmit, to the base station, a feedback message that is based at least in part on the first outcome and the second outcome;
• and
• receive, from the base station in a second time period and based at least in part on the transmitted feedback message indicating that at least one of the first outcome or the second outcome is a failed decoding procedure, a retransmission of the plurality of codeblock groups associated with the corresponding jointly shared channel resources.

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

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• transmit a plurality of codeblock groups to a user equipment (UE) in a first time period, each codeblock group of the plurality of codeblock groups being associated with a respective one decoding level of a plurality of decoding levels of a multi-level sequential decoding procedure, wherein the plurality of codeblock groups are associated with same jointly shared channel resources occupied by a corresponding portion of multi-level coded and modulated transmission;
• receive, from the UE, a feedback message that is based at least in part on a first outcome of the decoding procedure for a first codeblock group of the plurality of codeblock groups and a second outcome of the decoding procedure for a second codeblock group of the plurality of codeblock groups, wherein the second outcome for the second codeblock group is based at least in part on the first outcome for the first codeblock group, and the first codeblock group is associated with a lower decoding level than the second codeblock group;
• and
• transmit, to the UE in a second time period and based at least in part on the received feedback message indicating that at least one of the first outcome or the second outcome is a failed decoding procedure, a retransmission of the plurality of codeblock groups associated with the corresponding jointly shared channel resources.