Patent ID: 7801090

Claim:
A wireless telecommunication system, comprising: a base station configured to communicate with terminals over bidirectional communication channels, each channel supporting frames being divided into downlink timeslots and uplink timeslots, each downlink timeslot including a number of symbols intended to be transmitted to at least a terminal; and a terminal, after having received all the symbols included in a downlink timeslot followed by an uplink timeslot, configured to transmit other symbols over said uplink timeslot with a time delay depending on a distance between said terminal and said base station so that the transmitted symbols are received by said base station at a time separated from the end of the transmission by the base station of the downlink timeslot by a predefined guard period constant regardless of a distance between the base station and the terminal, wherein the base station comprises a transmitter configured to transmit at least a supplementary downlink symbol during the guard period to terminals capable of receiving said at least supplementary downlink symbol during the guard period and/or a receiver configured to receive, during the guard period, at least a supplementary uplink symbol from terminals capable of transmitting said at least supplementary uplink symbols during the guard period wherein the base station is configured to determine the time delay of the terminal at distance d from the base station by subtracting from the value of the guard period, a value of a round trip delay RTD(d) for the terminal, and wherein the value of the guard period is given by a value of a round trip delay RTD(dref) for a terminal at a predetermined reference distance dref from the base station plus a Receive Transmit Switch (RTS) time of switching from the reception mode into the transmission mode.