A method and apparatus are disclosed for assisting data transmission in a wireless communication system. In one embodiment, the method includes a UE transmitting information to a base station, wherein the information at least indicates time to start an uplink transmission by the UE. In another embodiment, the method could include the UE receiving, from the base station, a configuration indicating a periodic uplink resource allocation. In addition, the method could include the UE performing the uplink transmission based on the periodic uplink resource allocation.