A wireless transmit receive unit (WTRU) and a method used in a WTRU for controlling wireless communication Packet Switched (PS) data flow on radio access bearers (RABs) between a radio link controller (RLC) and an Internet Protocol Relay (IPR). A combined Radio Access Bearer Manager/Packet Data Convergence Protocol (RABM/PDCP) component provides interface control with a Session Manager (SM) and a radio resource center (RRC) such that the processing of PS data and control of each RAB is associated with the processing of PS data and control of a single radio bearer (RB).

 
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