Method and system for bearer management in a third generation mobile telecommunications system

In a telecommunication device the handling of data to be transmitted proceeds according to a protocol stack having a L3 layer and a MAC layer. For handling data flows between the layers the following steps are performed: a flow of data to be transmitted coming from the L3 layer is demultiplexed (206, 207, 403, 404) into a number of component data flows, each having a certain Quality of Service (QoS) requirement; the component data flows are arranged into groups where the QoS requirement of each component data flows in a group is similar to the QoS requirements of the other component data flows belonging to the same group; the component data flows are multiplexed (225, 226, 227, 409) groupwise into multiplexed data flows and outputted to the MAC layer. This way of handling data flows will make it possible for the management entity to increase or to decrease the capacity of each transmission pipe according to need corresponding to different QoS profiles.