DCI triggered HARQ-ACK codebook retransmission

1 . An apparatus for a user equipment (UE) configured for operation in a fifth-generation (5G) new radio (NR) network, the apparatus comprising: processing circuitry; and memory, the UE configured for Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) codebook determination,

wherein the processing circuitry is to decode a downlink control information (DCI) format received from a generation Node B (gNB), wherein when the DCI format triggers HARQ-ACK codebook retransmission, the processing circuitry is configured to:

determine a HARQ-ACK codebook to be retransmitted based on a time-offset indicated in the DCI format; and

encode a physical uplink control channel (PUCCH) to include the HARQ-ACK codebook determined to be retransmitted,

wherein the DCI format is received in a physical downlink control channel (PDCCH) ending in a downlink (DL) slot, and

wherein to determine the HARQ-ACK codebook to be retransmitted, the processing circuitry is configured to determine an uplink (UL) slot that included an initial transmission of the HARQ-ACK codebook based on subtracting the time-offset from in the DL slot,

wherein the UL slot that included the initial transmission of the HARQ-ACK codebook is a first UL slot, and

wherein the processing circuitry is further configured to determine a second UL slot for the retransmission of the HARQ-ACK codebook based on a slot-offset with respect to the DL slot,

wherein the DCI format is a DCI format for scheduling physical downlink shared channel (PDSCH) HARQ-ACK retransmissions and comprises one of DCI format 1_1 and DCI format 1_2,

wherein the DCI format includes a PDSCH HARQ-ACK transmission indicator (pdsch-HARQ-ACK-retx), and

wherein when the UE is configured by radio-resource control (RRC) signalling, the PDSCH HARQ-ACK transmission indicator requests the UE to perform a HARQ-ACK retransmission on a PUCCH resource,

wherein when the DCI format further includes a priority indicator field having a value, the value indicates a priority of HARQ-ACK information in the initial transmission of the HARQ-ACK codebook, the value indicating a priority of HARQ-ACK information for the retransmission of the HARQ-ACK codebook triggered by the DCI format,

wherein when the DCI format does not include a priority indicator field, the priority of the HARQ-ACK information for the retransmission of the HARQ-ACK codebook is zero, and

wherein the memory is configured to store the HARQ-ACK codebook.

2 . The apparatus of claim 1 , wherein the processing circuitry is to configure the UE to:

determine the HARQ-ACK codebook for the initial transmission based on PDSCH receptions in one or more candidate DL slots;

transmit an initial PUCCH carrying the initial transmission of the HARQ-ACK codebook in the first UL slot; and

transmit a second PUCCH carrying the retransmission of the HARQ-ACK codebook in the second UL slot.

3 . The apparatus of claim 2 , wherein the HARQ-ACK codebook is generated based on one of a Type 1 and a Type 2 HARQ-ACK codebook determination,

wherein for the Type 1 HARQ-ACK codebook determination, the HARQ-ACK codebook is a semi-static codebook, and

wherein for the Type 2 HARQ-ACK codebook determination, the HARQ-ACK codebook is a dynamic codebook.

4 . The apparatus of claim 1 , wherein the processing circuitry comprises a baseband processor, and wherein the PDCCH is received by the UE with a two or more antennas.

5 . A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of a user equipment (UE) configured for Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) codebook determination operation in a fifth-generation (5G) new radio (NR) network, wherein the processing circuitry is to decode a downlink control information (DCI) format received from a generation Node B (gNB),

when the DCI format triggers HARQ-ACK codebook retransmission, the processing circuitry is configured to:

determine a HARQ-ACK codebook to be retransmitted based on a time-offset indicated in the DCI format; and

encode a physical uplink control channel (PUCCH) to include the HARQ-ACK codebook determined to be retransmitted,

wherein the DCI format is received in a physical downlink control channel (PDCCH) ending in a downlink (DL) slot, and

wherein to determine the HARQ-ACK codebook to be retransmitted, the processing circuitry is configured to determine an uplink (UL) slot that included an initial transmission of the HARQ-ACK codebook based on subtracting the time-offset from in the DL slot,

wherein the UL slot that included the initial transmission of the HARQ-ACK codebook is a first UL slot, and

wherein the processing circuitry is further configured to determine a second UL slot for the retransmission of the HARQ-ACK codebook based on a slot-offset with respect to the DL slot,

wherein the DCI format is a DCI format for scheduling physical downlink shared channel (PDSCH) HARQ-ACK retransmissions and comprises one of DCI format 1_1 and DCI format 1_2,

wherein the DCI format includes a PDSCH HARQ-ACK transmission indicator (pdsch-HARQ-ACK-retx), and

wherein when the UE is configured by radio-resource control (RRC) signalling, the PDSCH HARQ-ACK transmission indicator requests the UE to perform a HARQ-ACK retransmission on a PUCCH resource,

wherein when the DCI format further includes a priority indicator field having a value, the value indicates a priority of HARQ-ACK information in the initial transmission of the HARQ-ACK codebook, the value indicating a priority of HARQ-ACK information for the retransmission of the HARQ-ACK codebook triggered by the DCI format,

wherein when the DCI format does not include a priority indicator field, the priority of the HARQ-ACK information for the retransmission of the HARQ-ACK codebook is zero.