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IEEE 802.16, also known as WiMAX, has received much attention recently for its capability to support multiple types of applications with diverse Quality-of-Service (QoS) requirements. Beyond what the standard has defined, Radio Resource Management (RRM) still remains an open issue, which plays an important role in QoS provisioning for different types of services. In this paper, the authors propose a downlink resource management framework for QoS scheduling in OFDMA based WiMAX systems. Their framework consists of a Dynamic Resource Allocation (DRA) module and a Connection Admission Control (CAC) module. A two-level hierarchical scheduler is developed for the DRA module, which can provide more organized service differentiation among different service classes, and a measurement-based connection admission control strategy is introduced for the CAC module.
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