A mobile communication system according to the present invention is a mobile communication system including user equipment, and a node device, in which a radio base station for performing radio communication with the user equipment and a radio network control device for controlling the radio base station are integrated; wherein the user equipment has an environment propagation reporting portion for reporting the node device of the environment for propagation at an RRC (Radio Resource Control) level only when the environment for propagation at the RRC level needs to be reported when FCS (Fast Cell Selection) is performed where soft handover is not performed.