Abstract: A mobile communications transmission system provides a plurality of mobile communications cells in a building or campus. It comprises a first baseband unit and a first gateway device, which is connectable to a data network. At least one transceiver unit is connected to the first baseband unit. The at least one transceiver unit is configured to provide at least one first mobile communications cell. By way of this first mobile communications cell, a subscriber device in the building can exchange information with the data network. A first control device is connected to the first baseband unit and the first gateway device. The first baseband unit and the first gateway device are installed in the building or campus in which the at least one transceiver unit provides the at least one first mobile communications cell, whereas the first control device is accommodated remote therefrom at an operating company.