A method for a UE multiplexing UCI is disclosed. The method comprises grouping physical uplink control channel (PUCCH) resources for channel state information (CSI) and a scheduling request (SR) with a low priority and PUCCH resources for a slot-based HARQ-ACK into a first group of PUCCH resources, grouping PUCCH resources for CSI and a SR with a high priority and PUCCH resources for a sub-slot based HARQ-ACK into a second group of PUCCH resources, determining a first set of PUCCH resources in a slot from the first group of PUCCH resources, obtaining first multiplexed UCI of a first PUCCH resource by performing a first UCI multiplexing procedure, determining a second set of PUCCH resources in a sub-slot of the slot from the second group of PUCCH resources, and obtaining second multiplexed UCI of a second PUCCH resource by performing a second UCI multiplexing procedure.