MOBILE COMMUNICATION METHOD, MOBILE STATION, CORE NETWORK DEVICE, AND RADIO BASE STATION

摘要

To provide remedies when the quality of a radio link in a Ud interface is deteriorated. In a mobile communication method according to the present invention, a first communication state in which transmission/reception of a data signal is performed between a mobile station UE#1 and a mobile station UE#2 through a radio link in a Ud interface set between the mobile station UE#1 and the mobile station UE#2 without through a radio link in a Uu interface set between a mobile station and a radio base station eNB, and a second communication state in which transmission/reception of a data signal is performed between the mobile station UE#1 and the mobile station UE#2 through the radio link in the Uu interface can be switched. When the mobile station UE#1 detects RLF in the Ud interface in the first communication state, the mobile station UE#1 transits to the second communication state.