To provide a means to deal with a CPRI link fault at a radio base station adopting a CPRI for an internal interface between a radio control unit and a radio unit at a low cost.

There are included a communication means for directly connecting a plurality of radio units and a means for defining a vendor specific area on a CPRI link connecting the communication means, another radio unit and a radio control units as a detour route of a CPRI link connecting the present radio unit and a radio control unit.