Hierarchical hybrid automatic repeat request for multi-level coding

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

• encoding, according to a multi-level coding and modulation procedure, at least a first codeblock group comprising a first plurality of codeblocks and a second codeblock group corresponding to the first codeblock group and comprising a second plurality of codeblocks, each codeblock of the first plurality of codeblocks associated with a first decoding level of the multi-level coding and modulation procedure, and each codeblock of the second plurality of codeblocks associated with a second decoding level of the multi-level coding and modulation procedure, the first decoding level lower than the second decoding level, and the first decoding level to be decoded prior to decoding of the second decoding level;
• transmitting, to a user equipment (UE) in a first time period and on a same set of channel resources, a multi-level coded and modulated signal comprising the encoded first codeblock group and the encoded second codeblock group;
• receiving, from the UE, a feedback message comprising an indication that a decoding procedure was unsuccessful for the first codeblock group and the second codeblock group;
• encoding, according to the multi-level coding and modulation procedure, a retransmission of the first codeblock group and a new set of codeblocks for the corresponding second codeblock group associated with the second decoding level;
• and
• transmitting, to the UE in a second time period in response to receiving the feedback message, the retransmission of the first codeblock group and the new set of codeblocks for the second codeblock group.

An apparatus for wireless communications 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, from a base station in a first time period and on a same set of channel resources, a multi-level coded and modulated signal comprising at least a first codeblock group and a second codeblock group corresponding to the first codeblock group, the first codeblock group comprising a first plurality of codeblocks and the second codeblock group comprising a second plurality of codeblocks, each codeblock of the first plurality of codeblocks associated with a first decoding level of the multi-level coded and modulated transmission and each codeblock of the second plurality of codeblocks associated with a second decoding level of the multi-level coded transmission, wherein the first decoding level is lower than the second decoding level, and the first decoding level is to be decoded prior to decoding of the second decoding level;
• determine that a decoding procedure associated with the first codeblock group is unsuccessful;
• store post processing samples for the multi-level coded and modulated signal;
• transmit, to the base station, a feedback message comprising an indication that the decoding procedure was unsuccessful for the first codeblock group and the second codeblock group;
• receive, from the base station in a second one or more time periods and in response to the transmitted feedback message, one or more retransmissions of the first codeblock group;
• successfully decode the first codeblock group based at least in part on the first codeblock group from the first time period and the one or more retransmissions of the first codeblock group from the second one or more time periods;
• and
• attempt to decode the second codeblock group from the first time period using the stored post processing samples and based at least in part on the successful decoding of the corresponding first codeblock group.

An apparatus for wireless communications 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:
• encode, according to a multi-level coding and modulation procedure, at least a first codeblock group comprising a first plurality of codeblocks and a second codeblock group corresponding to the first codeblock group and comprising a second plurality of codeblocks, each codeblock of the first plurality of codeblocks associated with a first decoding level of the multi-level coding and modulation procedure, and each codeblock of the second plurality of codeblocks associated with a second decoding level of the multi-level coding and modulation procedure, the first decoding level lower than the second decoding level, and the first decoding level to be decoded prior to decoding of the second decoding level;
• transmit, to a user equipment (UE) in a first time period and on a same set of channel resources, a multi-level coded and modulated signal comprising the encoded first codeblock group and the encoded second codeblock group;
• receive, from the UE, a feedback message comprising an indication that a decoding procedure was unsuccessful for the first codeblock group and the second codeblock group;
• encode, according to the multi-level coding and modulation procedure, a retransmission of the first codeblock group and a new set of codeblocks for the corresponding second codeblock group associated with the second decoding level;
• and
• transmit, to the UE in a second time period in response to receiving the feedback message, the retransmission of the first codeblock group and the new set of codeblocks for the second codeblock group.

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

• means for receiving, from a base station in a first time period and on a same set of channel resources, a multi-level coded and modulated signal comprising at least a first codeblock group and a second codeblock group corresponding to the first codeblock group, the first codeblock group comprising a first plurality of codeblocks and the second codeblock group comprising a second plurality of codeblocks, each codeblock of the first plurality of codeblocks associated with a first decoding level of the multi-level coded and modulated transmission and each codeblock of the second plurality of codeblocks associated with a second decoding level of the multi-level coded transmission, wherein the first decoding level is lower than the second decoding level, and the first decoding level is to be decoded prior to decoding of the second decoding level;
• means for determining that a decoding procedure associated with the first codeblock group is unsuccessful;
• means for storing post processing samples for the multi-level coded and modulated signal;
• means for transmitting, to the base station, a feedback message comprising an indication that the decoding procedure was unsuccessful for the first codeblock group and the second codeblock group;
• means for receiving, from the base station in a second one or more time periods and in response to the transmitted feedback message, one or more retransmissions of the first codeblock group;
• means for successfully decoding the first codeblock group based at least in part on the first codeblock group from the first time period and the one or more retransmissions of the first codeblock group from the second one or more time periods;
• and
• means for attempting to decode the second codeblock group from the first time period using the stored post processing samples and based at least in part on the successful decoding of the corresponding first codeblock group.

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

• means for encoding, according to a multi-level coding and modulation procedure, at least a first codeblock group comprising a first plurality of codeblocks and a second codeblock group corresponding to the first codeblock group and comprising a second plurality of codeblocks, each codeblock of the first plurality of codeblocks associated with a first decoding level of the multi-level coding and modulation procedure, and each codeblock of the second plurality of codeblocks associated with a second decoding level of the multi-level coding and modulation procedure, the first decoding level lower than the second decoding level, and the first decoding level to be decoded prior to decoding of the second decoding level;
• means for transmitting, to a user equipment (UE) in a first time period and on a same set of channel resources, a multi-level coded and modulated signal comprising the encoded first codeblock group and the encoded second codeblock group;
• means for receiving, from the UE, a feedback message comprising an indication that a decoding procedure was unsuccessful for the first codeblock group and the second codeblock group;
• means for encoding, according to the multi-level coding and modulation procedure, a retransmission of the first codeblock group and a new set of codeblocks for the corresponding second codeblock group associated with the second decoding level;
• and
• means for transmitting, to the UE in a second time period in response to receiving the feedback message, the retransmission of the first codeblock group and the new set of codeblocks for the second codeblock group.

A non-transitory computer-readable medium storing code for wireless communications at a user equipment (UE), the code comprising instructions executable by a processor to:

• receive, from a base station in a first time period and on a same set of channel resources, a multi-level coded and modulated signal comprising at least a first codeblock group and a second codeblock group corresponding to the first codeblock group, the first codeblock group comprising a first plurality of codeblocks and the second codeblock group comprising a second plurality of codeblocks, each codeblock of the first plurality of codeblocks associated with a first decoding level of the multi-level coded and modulated transmission and each codeblock of the second plurality of codeblocks associated with a second decoding level of the multi-level coded transmission, wherein the first decoding level is lower than the second decoding level, and the first decoding level is to be decoded prior to decoding of the second decoding level;
• determine that a decoding procedure associated with the first codeblock group is unsuccessful;
• store post processing samples for the multi-level coded and modulated signal;
• transmit, to the base station, a feedback message comprising an indication that the decoding procedure was unsuccessful for the first codeblock group and the second codeblock group;
• receive, from the base station in a second one or more time periods and in response to the transmitted feedback message, one or more retransmissions of the first codeblock group;
• successfully decode the first codeblock group based at least in part on the first codeblock group from the first time period and the one or more retransmissions of the first codeblock group from the second one or more time periods;
• and
• attempt to decode the second codeblock group from the first time period using the stored post processing samples and based at least in part on the successful decoding of the corresponding first codeblock group.

A non-transitory computer-readable medium storing code for wireless communications at a base station, the code comprising instructions executable by a processor to:

• encode, according to a multi-level coding and modulation procedure, at least a first codeblock group comprising a first plurality of codeblocks and a second codeblock group corresponding to the first codeblock group and comprising a second plurality of codeblocks, each codeblock of the first plurality of codeblocks associated with a first decoding level of the multi-level coding and modulation procedure, and each codeblock of the second plurality of codeblocks associated with a second decoding level of the multi-level coding and modulation procedure, the first decoding level lower than the second decoding level, and the first decoding level to be decoded prior to decoding of the second decoding level;
• transmit, to a user equipment (UE) in a first time period and on a same set of channel resources, a multi-level coded and modulated signal comprising the encoded first codeblock group and the encoded second codeblock group;
• receive, from the UE, a feedback message comprising an indication that a decoding procedure was unsuccessful for the first codeblock group and the second codeblock group;
• encode, according to the multi-level coding and modulation procedure, a retransmission of the first codeblock group and a new set of codeblocks for the corresponding second codeblock group associated with the second decoding level;
• and
• transmit, to the UE in a second time period in response to receiving the feedback message, the retransmission of the first codeblock group and the new set of codeblocks for the second codeblock group.