Providing QoS in ATM Access Router for Guaranting Differentiated Service of the Internet

摘要

PURPOSE: A method for providing QoS(Quality of Service) in an ATM access router to guarantee Internet differentiated service is provided to an ATM network to accept service quality for each Internet service defined in differentiated service by using a priority buffer and a QoS adaptive layer in an ATM access router. CONSTITUTION: If a packet, transmitted from the Internet, is received through a multi-classifier in an ATM access router(S601), the access router checks whether the received packet is an EF PHB(Expedited Forwarding Per Hop Behavior)(S602). If the received packet is the EF PHB, the access router checks whether the throughput of a CBR(Constant Bit Rate) buffer is enough(S603). In case that the throughput of a CBR buffer is enough, the access router stores the received packet in a buffer of class 0 and provides a top priority service(S604). However, if there is no available space in the CBR buffer, the access router discards the received packet(S605).