System and method for contrlling a data traffic flow in wibro system

The present invention provides a system and method for controlling the flow of data traffic in the portable Internet system (WiBro System). Configured to: (Mac Service Data unit MSDU) is a base station controller in a mobile Internet system to this MAC service data units if one or more of a predetermined sub-block receives the IP (Internet Protocol) packet from an upper layer to control flow of data traffic after the MSDU packing sub-header for differentiating: adding (PSH packing sub-header), said PSH-added the MSDU the same CID (Connection ID) to distinguish the MSDU group then group the MSDU has a value of and then by adding a MAC header is configured of one or more tunnel messages, and a tunnel frame is added to the header to generate after creating a tunnel frame tunnel frame for differentiating the tunnel message with the tunnel messages, characterized in that transmission to the base station . WiBro (Wireless Broadband), RAS (Radio Access Station), ACR (Access Control Router), PSS (Portabl Subscriber Station)