Method and apparatus for transmitting stuck indication by user equipment in wireless communication system

A method for transmitting signals by a UE configured with two or more transmission paths of one radio bearer (RB) in a wireless communication system is disclosed. The method comprises detecting a stuck problem in one transmission path of the two or more transmission paths; transmitting an indicator related to the stuck problem to a network; and resetting a protocol entity of the transmission path having the stuck problem, wherein the stuck problem comprises a difference between the sequence number (SN) of the data unit transmitted by the transmission path having the stuck problem and the SN of the data unit transmitted by another transmission path being larger than a threshold.