A signal having a frame structure is transmitted and received in a cell by a first base station, the structure of the frame having a downlink frame part and an uplink frame part. Each frame part has the ability of carrying at least one data region allocated to at least one user or broadcasted for the traffic flow between the telecommunication network and the user terminal via the first base station. The downlink frame part has an overhead part with at least synchronization or system information. The frame structured signal is transmitted periodically Frame N, Frame N+1, Frame N+2, Frame N+3 with a normal interval defined by the system. The system during, a power saving mode, increases the interval between at least a first and the next following second frame structured signal to a power saving interval.