A base station distributed unit transmits at least one system information block to a wireless device. The at least one system information block indicates a first public land mobile network (PLMN) and a second PLMN. The base station distributed unit receives a radio resource control message from the wireless device. The radio resource control message indicates at least one PLMN of the first PLMN and the second PLMN. The base station distributed unit determines, by based on the at least one PLMN, at least one base station central unit from: a first base station central unit of the first PLMN; and a second base station central unit of the second PLMN. The base station distributed unit transmits the radio resource control message to the at least one base station central unit.