The present invention relates to a method in a radio communication system providing packet data services. A radio communication system providing packet data services and a packet data scheduler (PS) are also disclosed. In accordance with the method capacity is requested for a packet data bearer, whereafter capacity is allocated for the packet data bearer based on a first timing scheme. The allocated capacity may be modified based on a second timing scheme. The packet data scheduler (PS) comprises two timers (T1, T2) fore implementing the two different timing schemes.