Method and arrangement for controlling the flow in the umts using the UBS field information.

Network (103) in a universal mobile telecommunications system (UMTS), including a controller (111) radio network and a base (113) radio station, transmitting data frames from the controller (111) radio network the base (113) radio station, carrying each data frame information belongs to one of a plurality of data flows, characterized by - a unit (911) for determining to determine periodically repeated times, for each of the flows data, if more data frames in the controller (111) radio network waiting to be transmitted, the unit (911) for determining being arranged to use information in the field "size User Buffer" (UBS) in data frames received by the base (113) radio station, - a unit (919) for allocating capacity to assign, - - for each of that s data streams for which there has been no data frames waiting to be transmitted over a predetermined time period, a predetermined bit rate or bandwidth fully available for transmission minimum amount from the controller (111) Network radio to the base (113) radio station - - for each of the flows remaining data, a share of the rest of the bit rate or bandwidth fully available, so that the sum of the quotas all of said remaining data streams is equal to said remainder, for transmission from the controller (111) radio network to the base (113) radio station.