A method of operating a cellular telecommunications network, the cellular telecommunications network including a first base station, a User Equipment (UE) and a remote transceiver, wherein the first base station is adapted to send a signal to the UE, the method including receiving data from an external sensor indicating a first change in a propagation environment between the first base station and the UE; and, in response, the remote transceiver repeating a signal between the first base station and the UE.