Apparatus and method for determining the content of a retransmission

A non-transitory computer readable medium having instructions stored thereon that, when executed by one or more processors of a user equipment (UE), cause the UE to perform operations, the operations comprising:

• obtaining a parity check matrix (PCM) associated with a received message;
• assigning rows of the PCM to respective groups of a plurality of groups, the respective groups having corresponding one or more parity checks as determined by the PCM, wherein the assigning comprises assigning two or more rows of the PCM to a respective group of the plurality of groups, the respective group having corresponding one or more parity checks as determined by the two or more rows of the PCM;
• determining whether the respective groups of the plurality of groups include one or more unsatisfied parity checks based on variable node matching within the PCM;
• generating a feedback message including a plurality of bits corresponding to the plurality of groups, wherein individual bits of the plurality of bits indicate whether the respective groups of the plurality of groups include one or more unsatisfied parity checks;
• and
• transmitting or causing to transmit the feedback message to a base station of a wireless network.

A user equipment (UE), comprising:

• radio front end circuitry configured to receive a message over a wireless network;
• and
• processor circuitry, coupled to the radio front end circuitry, configured to:
• obtain a parity check matrix (PCM) associated with the received message;
• assign rows of the PCM to respective groups of a plurality of groups, the respective groups having corresponding one or more parity checks as determined by the PCM, wherein to assign, the processor circuitry is configured to assign two or more rows of the PCM to a respective group of the plurality of groups, the respective group having corresponding one or more parity checks as determined by the two or more rows of the PCM;
• generate a feedback message including a plurality of bits corresponding to the plurality of groups, wherein an individual bit of the plurality of bits indicates whether a corresponding respective group of the plurality of groups includes one or more unsatisfied parity checks;
• and
• transmit, using the radio front end circuitry, the feedback message to a base station of the wireless network.

A method of operating a base station, comprising:

• transmitting or causing to transmit a message to a user equipment (UE) served by the base station;
• receiving a feedback message with a plurality of bits from the UE, wherein individual bits of the feedback message indicate whether respective individual groups of rows from a parity check matrix (PCM) associated with the transmitted message include one or more unsatisfied parity checks, wherein the individual groups of rows form a plurality of groups corresponding to the plurality of bits, wherein two or more rows of the PCM are assigned to a respective group, the respective group having corresponding one or more parity checks as determined by the two or more rows of the PCM;
• and
• transmitting or causing to transmit to the UE, a retransmission of bits from the message that are associated with the individual groups of rows that were indicated to include the one or more unsatisfied parity checks.