A mobile communication system, comprising: a base station coupled to a cellular communication network; a cellular user terminal configured to transmit wireless signals to said base station and to receive wireless signals from said base station; a controller configured to control at least one non-cellular network and to receive wireless signals from at least one non-cellular user terminal; and an interference measurement component; wherein said base station is configured to transmit an offload message to at least one of a) said cellular user terminal wherein said offload message comprises i) a request for said cellular user terminal to connect to said controller and ii) at least one of an identifier identifying said non-cellular network and an identifier identifying said controller, and b) said controller, wherein said offload message comprises iii) a request for said controller to connect to said cellular user terminal and iv) an identifier identifying said cellular user terminal, characterised in that: said controller comprises at least part of said interference measurement component, and said interference measurement component is configured to measure interference caused by said cellular user terminal to other user terminals; said base station is further configured to receive from the controller, interference measurements performed by the controller and/or by the at least one non-cellular terminal, and is further configured to transmit said offload message when said interference measured by said interference measurement component exceeds a certain threshold; and said controller is further configured to relay at least part of information sent by said cellular user terminal to said controller to at least one of said base station, said cellular network, and a further non-cellular network coupled to the Internet, or to relay at least some information from said base station and intended for said cellular user terminal via said controller to said cellular user terminal. a base station coupled to a cellular communication network; a cellular user terminal configured to transmit wireless signals to said base station and to receive wireless signals from said base station; a controller configured to control at least one non-cellular network and to receive wireless signals from at least one non-cellular user terminal; and an interference measurement component; wherein said base station is configured to transmit an offload message to at least one of a) said cellular user terminal wherein said offload message comprises i) a request for said cellular user terminal to connect to said controller and ii) at least one of an identifier identifying said non-cellular network and an identifier identifying said controller, and b) said controller, wherein said offload message comprises iii) a request for said controller to connect to said cellular user terminal and iv) an identifier identifying said cellular user terminal, characterised in that: said controller comprises at least part of said interference measurement component, and said interference measurement component is configured to measure interference caused by said cellular user terminal to other user terminals; said base station is further configured to receive from the controller, interference measurements performed by the controller and/or by the at least one non-cellular terminal, and is further configured to transmit said offload message when said interference measured by said interference measurement component exceeds a certain threshold; and said controller is further configured to relay at least part of information sent by said cellular user terminal to said controller to at least one of said base station, said cellular network, and a further non-cellular network coupled to the Internet, or to relay at least some information from said base station and intended for said cellular user terminal via said controller to said cellular user terminal. said controller comprises at least part of said interference measurement component, and said interference measurement component is configured to measure interference caused by said cellular user terminal to other user terminals; said base station is further configured to receive from the controller, interference measurements performed by the controller and/or by the at least one non-cellular terminal, and is further configured to transmit said offload message when said interference measured by said interference measurement component exceeds a certain threshold; and said controller is further configured to relay at least part of information sent by said cellular user terminal to said controller to at least one of said base station, said cellular network, and a further non-cellular network coupled to the Internet, or to relay at least some information from said base station and intended for said cellular user terminal via said controller to said cellular user terminal.