The invention discloses a communication system, method and devices for controlling transmission of packets to a user equipment during cell change. The communication system is configured so that data to be transmitted to the user equipment are first transmitted, e.g. from a network controller, to a serving cell and then transmitted from a data buffer of the serving cell to the user equipment. After having performed a cell change from the serving cell to the target cell, the data are transmitted from the target cell to the user equipment. The system, method and devices are adapted to reduce the amount of data in the data buffer in response to a decision of performing a cell change from the serving cell to the target cell. The reduction of the amount of data in the data buffer can be achieved e.g. by reducing the data flow from the network controller to the serving cell, and/or by increasing the data flow from the data buffer to the user equipment.