A mobile communications network comprising a plurality of radio heads (107, 205) adapted to transceive radio signals and to convert the radio signals between baseband representations of the radio signals and radio frequency representation of the radio signals, comprising: a processing architecture (112, 310, 350, 410, 452, 504) adapted to process the baseband representations of the radio signals and adapted to be ad hoc allocated and shared on demand between different ones of the plurality of radio heads (107, 205); wherein the processing architecture is a cloud processing architecture and comprises non-dedicated processing resources (112, 310, 350, 410, 452, 504) which are adapted to be shared between different ones of the plurality of radio heads (107, 205); and a plurality of radio head links between the plurality of radio heads (107, 205) and the cloud processing architecture, characterized in that the cloud processing architecture comprising a plurality of BTS hotels connected to an asynchronous switched network, wherein a radio head includes an active antenna comprises a transmit/receive module connected to a plurality of antenna elements, wherein, for downlink communications from the active antenna to a mobile station, the transmit/receive module is adapted to time-synchronize the transmission of certain portions of the transmit radio signal; the transmit/receive module being connected to an integrated absolute timing reference and to a packet analyser, wherein the packet analyser is adapted to receive packets, from a network interface, wherein the packets have been received by the active antenna from said switched network, the packet analyser further adapted to extract a timing information from said received packets and to forward the timing information to the transmit/receive module, and wherein the active antenna is adapted to compare the timing information with a current time provided by the absolute timing reference, and wherein the active antenna is adapted to initiate a transmission of said portion of the transmit signal when said current time matches said timing information. a processing architecture (112, 310, 350, 410, 452, 504) adapted to process the baseband representations of the radio signals and adapted to be ad hoc allocated and shared on demand between different ones of the plurality of radio heads (107, 205); wherein the processing architecture is a cloud processing architecture and comprises non-dedicated processing resources (112, 310, 350, 410, 452, 504) which are adapted to be shared between different ones of the plurality of radio heads (107, 205); and a plurality of radio head links between the plurality of radio heads (107, 205) and the cloud processing architecture, characterized in that the cloud processing architecture comprising a plurality of BTS hotels connected to an asynchronous switched network, wherein a radio head includes an active antenna comprises a transmit/receive module connected to a plurality of antenna elements, wherein, for downlink communications from the active antenna to a mobile station, the transmit/receive module is adapted to time-synchronize the transmission of certain portions of the transmit radio signal; the transmit/receive module being connected to an integrated absolute timing reference and to a packet analyser, wherein the packet analyser is adapted to receive packets, from a network interface, wherein the packets have been received by the active antenna from said switched network, the packet analyser further adapted to extract a timing information from said received packets and to forward the timing information to the transmit/receive module, and wherein the active antenna is adapted to compare the timing information with a current time provided by the absolute timing reference, and wherein the active antenna is adapted to initiate a transmission of said portion of the transmit signal when said current time matches said timing information.