A base station distributed unit receives a first message from a first base station central unit. The first message comprises a first public land mobile network (PLMN) identifier of a first PLMN comprising the first base station central unit. The base station distributed unit receives a second message from a second base station central unit. A second message comprises a second PLMN identifier of a second PLMN. The comprises the second base station central unit. A base station distributed unit transmits at least one system information block. The at least one system information block comprises the first PLMN identifier and the second PLMN identifier.