The invention comprises a method for migrating control plane data transport between a control node (5) and a base station (5) controlled by the control node from an old and currently used transport technology, e.g. an ATM based transport option, to a new transport technology, e.g. an IP based transport option. A protocol stack for the new transport technology is created (31) in the control node (5). In a similar manner, a protocol stack for the new transport technology is created (31) in the base station (7). Thereafter, a connection based on the new transport technology is formed (33) between the control node and the base station. Then the new transport technology is used (39) on the formed connection for at least one new control plane message between the control node to the base station. The invention comprises also a device for controlling a migration of control plane data transport between a control node and a base station in accordance with the above-described method and a control node comprising such a device.