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The IEEE 802.16/802.16e provides powerful tools in order to achieve different QoS constraints. The MAC layer defined five scheduling service types to provide QoS differentiation for different types of applications. In this paper, we investigate the performance of the scheduling schemes deployed in the OPNET modeler by considering VoIP, video conferencing and non-real-time services. We further investigate the scheduling algorithm with respect to the end-to-end delay (ETE) when the subframe ratio is set to 2:1 and 1:1. Simulation results revealed that higher downlink subframe ratio should be employed for a data-only (non-real time) network while 1:1 subframe ratio is more appropriate in supporting real-time traffic network. A performance analysis and discussion are provided.