Apparatus and method for varying the bandwidth of service on qos network

The present invention relates to an adaptive service bandwidth control apparatus and method in a mobile communication system, the differential service for QoS (Quality of Service) guarantee is applied, when there is room in the network resources more bandwidth than the allowable reference value use and provides a couple of weights, depending on the grade services in an overload condition by transmitting a packet to occur efficiently, so that the user can receive the best service available. QoS (Quality of Service), an adaptive bandwidth control service, service variable bandwidth, the bandwidth adjuster (shaper)