Method for performing an adaptive bundling transmission in wireless communication system and a device therefor

A communication device for operating in a wireless communication system, the communication device comprising:

• a memory;
• and
• a processor operably coupled with the memory and configured to:
• generate an uplink (UL) data to be transmitted for an uplink grant of a Hybrid-ARQ (HARQ) process;
• perform a first non-bundled new HARQ transmission of the UL data, and
• perform a non-bundled HARQ retransmission of the UL data based on the first non-bundled new HARQ transmission of the UL data being failed,
• wherein a counter of the HARQ process is reset based on performing a non-bundled new HARQ transmission,
• wherein the counter is counted each time a HARQ transmission of the UL data fails,
• wherein based on a value of the counter being equal to or larger than a first threshold, a first bundled HARQ retransmission of the UL data is performed,
• wherein based on the value of the counter corresponding to the first bundled HARQ retransmission being equal to or larger than a second threshold, a second bundled HARQ retransmission for the UL data is performed, and
• wherein based on an Acknowledgement (ACK) related to the second bundled HARQ retransmission of the UL data being received, a second non-bundled new HARQ transmission of the UL data is performed.