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In this paper, a novel concept of decoupling the end-to-end QoS provisioning from the service provisioning at routers in the Diffserv network is proposed to enhance the QoS granularity offered in the Diffserv model and improve both the network resource utilization and user benefits. To realize the concept, we implement a new endpoint admission control, referred to as explicit endpoint admission control, with the service vector concept at the user side, which allows a data flow to choose different services at different routers. At the router side, we propose a new packet marking scheme, by which the end host can obtain the performance of each service class at each router and determine the service vector. The achievable performance of the proposed approach is studied and the corresponding results demonstrate that the proposed mechanism can have better service differentiation capability and lower request dropping probability than the Intserv over Diffserv schemes while it still maintains the simplicity feature of the Diffserv network model.