MULTIPLE TIMING ADVANCE GROUPS FOR MULTI-TRANSMISSION/RECEPTION POINT

Methods and apparatuses for a multiple timing advance groups for a multi-TRP operation in a wireless communication system. A method of a UE comprises: determining whether a serving cell is configured with more than one TAG and a timer of a TAG associated with a TCI state stops or expires for a first HARQ feedback in a first HARQ process on the serving cell or a second HARQ feedback in a second HARQ process on the serving cell; determining to not generate a first indication indicating a lower layer to generate an ACK corresponding to a data transmission in a TB in the first HARQ process; and determining to not generate a second indication indicating the lower layer to generate an ACK corresponding to a data transmission in a TB in the second HARQ process when the serving cell is configured with a sl-PUCCH-Config.