The present invention is directed to a method and an apparatus for use in a wireless communication system. Specifically, the present invention is directed to a method of performing a ProSe communication by a UE in a cellular communication system and an apparatus therefore, in which the method comprises: receiving, from a BS, a first PDCCH signal including scheduling information and a CRC, wherein the CRC is masked with a ProSe-related ID; receiving, from the BS, a PDSCH signal using the scheduling information, wherein the PDSCH signal includes WLAN resources and information available for the ProSe communication; establishing a ProSe connection with a peer UE by using the WLAN resources and information; and exchanging WLAN radio signals with the peer UE in accordance with the ProSe connection, wherein the UE is configured to keep monitoring a second PDCCH signal during the WLAN radio signals are exchanged.