A method for processing signals by a user equipment (UE) in a Wireless communication system is disclosed. The method includes steps of transmitting, to a network, a request message for configuring a time resource in which a transmission of a message via a sidelink is prioritized over a transmission of an uplink message and a reception of a downlink message; receiving, from the network, a configuration message as a response of the request message; and transmitting the V2X message in the time resource via the sidelink.