Base stations and Radio Network Controllers, RNCs, and methods in such devices are disclosed. A base station (18) sends access indications to a RNC (20) indicating assignments and/or releases of common uplink resources. The RNC (20) uses the access indications received from the base station (18) to differentiate between successive accesses on the common uplink resources by a same User Equipment, UE (22), and to correspondingly differentiate between the processing of given data frames from the UE (22) as belonging to one or other of the successive accesses.