Method for performing a logical channel prioritization in a carrier aggregation with at least one scell operating in an unlicensed spectrum and a device therefor

A User Equipment (UE) for operating in a wireless communication system, the UE comprising:

• a Radio Frequency (RF) module;
• and
• a processor operably coupled with the RF module and configured to:
• configure with a first cell group including at least one first cell and a second cell group including at least one second cell served by an eNB;
• configure a plurality of logical channels, wherein each logical channel of the plurality of logical channels respectively corresponds to one of a first type logical channel that cannot be transmitted to the second cell and a second type logical channel that can be transmitted to the second cell;
• receive a uplink grant for the first cell or the second cell;
• perform a first Logical Channel Prioritization (LCP) procedure to all of the plurality of logical channels if the uplink grant for the first cell is received;
• and
• perform a second LCP procedure to only logical channels corresponding to the second type logical channels if the uplink grant for the second cell is received.