Abstract: Providing a data transfer connection according to a connection-oriented data transfer protocol between a first communication entity and a second communication entity using a wireless transmission path, the first communication entity being capable of using at least two wireless transmission paths in data transfer. A data transfer connection is established between said first communication entity and said second communication entity in so that the first communication entity uses one of the wireless transmission paths on the data transfer connection. The data transfer flow is controlled on said data transfer connection using one or more windows that indicate the maximum amount of data to be transferred simultaneously on said data transfer connection. At least one of said windows is adjusted based on the wireless transmission path used.