The present invention relates to a UE, base station network node and methods thereof in a cellular mobile communication system. One method concerns handover from a first radio base station (Node B1) to a second radio base station (Node B2) wherein, it comprises the steps receiving a notification from the first radio base station (Node B1) that currently serves said UE, said notification indicating the last packet (flag) to be transmitted to this user equipment from said first radio base station (Node B1) on a first connection; and informing the second radio base station (Node B2) by a request to commence transmission from this second radio base station (Node B2) when the notified last packet (flag) is received at the UE.