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The differentiated service architecture is based on a simple model by applying a per-class service in the core node of the network. However, due to the simplified network behaviour, the network structure and provisioning were more complicated. If a service provider wants the dynamic provisioning or better bandwidth guarantee, signaling protocol with QoS parameters or admission control method should be deployed in DiffServ network. However, these methods increase the complexity. Therefore, we propose new dynamic provisioning mechanism for admission control in the DiffServ network based on the centralized bandwidth broker and distributed measurement based admission control and movable boundary bandwidth management.