A method includes, in a mobile communication terminal, accepting from an application layer first data having a first data size for transmission to a base station over a radio channel. An indication of a second data size of second data, which is to be transmitted over the radio channel but was not yet accepted from the application layer, is accepted from the application layer. A resource allocation on the radio channel is calculated in the terminal depending on both the first data size and the second data size. The base station is requested for the resource allocation, and at least part of the first and second data is transmitted from the terminal in accordance with the resource allocation.