HARQ Codebook Determination in Wireless Communications

An apparatus comprising processing circuitry configured to:

• process, based on signaling from a base station, a plurality of downlink control information (DCI) transmissions during a corresponding plurality of physical downlink control channel (PDCCH) monitoring occasions, wherein each DCI transmission schedules multiple physical downlink shared channel (PDSCH) transmissions on a corresponding one of a plurality of component carriers (CCs);
• determine a maximum number of PDSCH transmissions per CC;
• group the CCs into one or more CC groups;
• determine a hybrid automatic repeat request (HARQ)-acknowledgement (ACK) codebook size;
• and
• generate a plurality of HARQ bits for each of the multiple PDSCH transmissions, wherein the plurality of HARQ bits is equal to the maximum number of PDSCH transmissions per CC group.

A user equipment (UE), comprising:

• transceiver circuitry configured to communicate with a base station;
• and
• processing circuitry communicatively coupled to the transceiver circuitry and configured to:
• process, based on signaling from the base station, a plurality of downlink control information (DCI) transmissions during a corresponding plurality of physical downlink control channel (PDCCH) monitoring occasions, wherein each DCI transmission schedules multiple physical downlink shared channel (PDSCH) transmissions on a corresponding one of a plurality of component carriers (CCs);
• determine a maximum number of PDSCH transmissions per CC;
• group the CCs into one or more CC groups;
• determine a hybrid automatic repeat request (HARQ)-acknowledgement (ACK) codebook size;
• and
• generate a plurality of HARQ bits for each of the multiple PDSCH transmissions,
• wherein the plurality of HARQ bits is equal to the maximum number of PDSCH transmissions per CC group.

A method, comprising:

• processing, based on signaling from a base station, a plurality of downlink control information (DCI) transmissions during a corresponding plurality of physical downlink control channel (PDCCH) monitoring occasions, wherein each DCI transmission schedules multiple physical downlink shared channel (PDSCH) transmissions on a corresponding one of a plurality of component carriers (CCs);
• determining a maximum number of PDSCH transmissions per CC;
• grouping the CCs into one or more CC groups;
• determining a hybrid automatic repeat request (HARQ)-acknowledgement (ACK) codebook size;
• and
• generating a plurality of HARQ bits for each of the multiple PDSCH transmissions, wherein the plurality of HARQ bits is equal to the maximum number of PDSCH transmissions per CC group.