The present invention relates to a wireless communication system, and more particularly, to a method and an apparatus for performing a handover related to a mobile cell. A method for a user equipment handing over a mobile relay, according to one embodiment of the present invention, can comprise a step of reporting to a serving base station information on the state of the user equipment with respect to the mobile relay handover, and a step of handing over the mobile relay based on a handover command by the serving base station, the handover being determined based on the state of the user equipment. As a result, a way for efficiently and accurately performing the handover related to the mobile cell can be provided.