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Scheduling algorithms are of utmost importance in WiMAX for efficient use of radio resources. A scheduling algorithm should take into account the WiMAX QoS classes and service requirements. It should also provide high throughput. This paper proposes a review of scheduling algorithms proposed for WiMAX. The paper focuses on the real-time Polling Service (rtPS) QoS class. NS-2 simulations show interesting results. The paper highlights a problem that may exist with the WiMAX rtPS QoS class and provides solutions for it. Simulation results concerning proposed WiMAX schedulers are discussed. The paper proposes an enhancement of the maximum Signal-to-Interference Ratio (mSIR) scheduler, called modified maximum Signal-to-Interference Ratio (mmSIR).
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