Method and apparatus for grant-free data transmission in wireless communication system

An apparatus for a terminal in a wireless communication system, the apparatus comprising:

• a communication interface;
• a storage unit;
• and
• at least one processor, coupled to the communication interface and the storage unit, configured to:
• receive, from a base station, resource allocation information for a grant-free transmission from a base station,
• transmit, to the base station, uplink data by using grant-free transmission resources based on the resource allocation information, according to a predefined number of repetitions, wherein the transmitting of the uplink data comprises:
• if receiving a grant-free resource allocation indicator from the base station, receive token bits corresponding to the terminal from the base station,
• count a number of retransmission times,
• if the number of retransmission times exceeds a maximum retransmission number, detect reserved resource allocation information according to information of the resources used by a last data transmission,
• determine reserved resources allocated for the terminal based on the detected reserved resource allocation information and the token bits, and
• transmit data on the reserved resources,
• identify a transmission amount of the uplink data according to the predefined number of repetitions,
• identify whether the transmission amount is smaller than an amount of total uplink data,
• transmit, to the base station, in case that the transmission amount is smaller than the amount of total uplink data, uplink data transmission is not completed by using the grant-free transmission resources, a request for dedicated resources,
• receive, from the base station, dedicated resources allocation information, and
• transmit, to the base station, a remaining portion of the total uplink data by using dedicated resources corresponding to the dedicated resources allocation information.