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QoS service provisioning is an important issue for deploying broadband wireless access networks with real-time and non real-time traffic integrated. In order to achieve high utilization while providing different QoS supports to various applications, a QoS architecture and scheduling schemes should be embedded into the MAC protocol. In this paper, we introduce a new 3-tier architecture and scheduling schemes for QoS support in WiMAX. A series of simulation experiments have been carried out to evaluate the performance of the proposed scheduling framework and scheduling algorithms. The simulation results show that the network QoS service performance improves in terms of delay, throughput and loss rate.