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A Dynamic Bandwidth Request Mechanism for WiMAX
Bandwidth is a key technology for business QoS in WiMAX system, it will effect system’s performance directly. At present, some algorithms are proposed, for example, unicast polling and competition bandwidth allocation scheme, game theory tactics. But these methods either the algorithm are complex or prediction accuracy are low. In order to improve the bandwidth request mechanism, a dynamic bandwidth request mechanism based on the flow rate forecast is proposed in this paper. Firstly, the bandwidth request model is given. Then the time-gap and data arrival rate in model is predicted using dynamic index smooth model, thus the dynamic bandwidth request is realized. The forecasting result becomes more precise with the optimization to the smooth model using steepest descent repetitive process. The simulation results show that proposed the algorithm can reduce the package’s transmission time delay and the data queue size effectively, and bandwidth utilization is enhanced.
WiMAX, Bandwidth Request, Dynamic Index Smooth, Prediction.
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