Method and apparatus for transmitting grant-free based uplink data in wireless communication system

A user equipment (UE) comprising:

• a memory;
• a transceiver;
• and
• at least one a processor operatively coupled to the memory and the transceiver,
• wherein the at least one processor is configured to:
• control the transceiver to receive, from a base station, information for a semi-statically configured uplink (UL) resource;
• control the transceiver to receive, from the base station, allocation information for a first reference signal for an initial transmission of UL data and allocation information for a second reference signal for a retransmission of the UL data;
• control the transceiver to perform the initial transmission of the UL data via the semi-statically configured UL resource based on the first reference signal,
• control the transceiver to receive, from the base station, a UL grant for the retransmission of the UL data after performing the initial transmission;
• and
• control the transceiver to perform the retransmission of the UL data via a UL resource related to the UL grant based on the second reference signal,
• wherein at least one of the first reference signal and the second reference signal comprises a UE specific reference signal,
• wherein a cyclic redundancy check (CRC) of the UL grant is masked by a temporary identifier,
• wherein information on a modulation and coding scheme (MCS) level and transmit power for the UE is received via a downlink data channel,
• wherein at least one of the initial transmission and the retransmission is performed based on the MCS level and transmit power,
• wherein the semi-statically configured UL resource occurs periodically,
• wherein, in case the semi-statically configured UL resource is deactivated in a specific subframe of a period, a scheduling request resource is allocated, and
• wherein the semi-statically configured UL resource is allocated before a next period with respect to the period based on a scheduling request being transmitted via the scheduling request resource.