Patent ID: 8213386

Claim:
Method for carrying out a handover between base stations of a telecommunication network, wherein each mobile terminal is in communication with a set of base stations including at least a first base station and a second base station, the first base station receiving downlink data to be transmitted within data packets bearing a downlink sequence number to a first mobile terminal from an access gateway of the telecommunication network, wherein the method comprises the steps executed by the first base station of determining a downlink sequence number, sending a handover request message to the second base station comprising the determined downlink sequence number and information related to the set of base stations, requesting the second base station to receive data to be transmitted to the first mobile terminal from the access gateway, stopping building data packets to be transmitted to the first mobile terminal from data received from the access gateway if said built data packets would bear a sequence number equal to or higher than the determined downlink sequence number, sending said data received from the access gateway to the second base station, receiving data packets to be transmitted to the first mobile terminal from the second base station, transmitting directly to the first mobile terminal the data packets to be transmitted to the first mobile terminal received from the second base station, receiving specific data from the access gateway indicating that subsequent data will be now transmitted to the second base station, and releasing a dedicated link between said first base station and said access gateway.