A method of data communication in a wireless communication system is disclosed. A method of receiving data in a user equipment of a wireless communication system comprises receiving scheduling information from a network, the scheduling information including downlink (DL) resource assignment information and an indicator; if the scheduling information includes a first UE identity and the first indicator has a first value, utilizing the scheduling information as configuration information of a persistent scheduling to receive a downlink data packet from the network; and if the scheduling information includes the first UE identity and the first indicator has a second value, utilizing the scheduling information to receive a retransmission data packet from the network.