Method and device for determining bits of a hybrid automatic repeat request acknowledgement (harq-ack) codebook

A user equipment (UE) comprising:

• a transceiver;
• and
• a processor;
• wherein the transceiver and the processor are configured to:
• receive signaling that is used to determine a target serving cell and a first time unit, the target serving cell being either a first serving cell or a second serving cell, the first serving cell and the second serving cell being different serving cells;
• determine a Hybrid Automatic Repeat reQuest Acknowledgement (HARQ-ACK) codebook;
• and
• transmit a signal in the first time unit on the target serving cell, the signal carrying the HARQ-ACK codebook, the HARQ-ACK codebook comprising at least one HARQ-ACK information bit;
• wherein a first time is a boundary time for an active uplink (UL) bandwidth part (BWP) change on the first serving cell, a start of the first time unit is no earlier than the first time, and a second time unit is a time unit before the first time;
• and
• wherein the target serving cell is used to determine whether the HARQ-ACK codebook comprises one or more HARQ-ACK information bits for the second time unit on the first serving cell.