The present invention concerns a transmission method in a wireless telecommunication system including at least a base station intended to communicate with terminals over bidirectional communication channels, each channel supporting frames being divided into downlink sub frames and uplink sub frames, each downlink sub frame including a number of symbols intended to be transmitted to at least two terminals, wherein the transfer of at least one supplementary symbol between the base station and at least one terminal that can receive or transmit said at least one supplementary symbol is enabled. The base station forms a first group of terminals and at least another group of at least one terminal, the first group of terminals comprising at least terminals which can not receive and/or transmit said at least supplementary symbol, the other group of at least one terminal comprising at least a terminal which can receive and/or transmit said at least supplementary symbol during the time delay, allocates multiplexing resources of the wireless telecommunication network to at least a part of the terminals comprised in the first group, allocates all the multiplexing resources allocated to the terminals comprised in the first group to one terminal comprised in the other group for at least one supplementary symbol.