The present invention relates to a method for synchronising a radio communication system comprising at least two base stations and a terminal adapted to perform a handover between said at least two base stations, the at least two base stations needing to be synchronised to the same time reference. According to the present invention, the method is characterised in that it includes the steps of: upon handover of a terminal to a target base station, generating a message by said terminal included an information related to the time reference of said serving base station, upon reception of said message at said target base station, calculating the new target base station time reference in function of said information related to the time reference of said serving base station.