The invention relates to an energy-saving method for implementing in-cell communication in a telecommunication system by at least one first base station. The first base station sends and receives a signal (23) with a frame structure in a cell; the frame structure comprises a downlink frame part (15) and an uplink frame part (16); each of the downlink frame part (15) and the uplink frame part (16) has capacity of distributing service flow flowing through the first base station between a telecommunication network and a user terminal to at least one data region (19 or 21) of at least one user or broadcast; and the downlink frame part (15) comprises an overhead part at least provided with synchronous information (17) or system information (18). The signal (23) (a frame N, a frame N+1, a frame N+2 and a frame N+3) with the frame structure is periodically sent according to a normal interval defined by a system. The method has the characteristic that in a power saving mode, the system increases an interval between the first signal (23) with the frame structure and a following second signal (23) with the frame structure to a power saving interval.