WiMAX实时业务下的自适应带宽申请机制

An Adaptive Bandwidth Request Mechanism for Real-Time Traffic in WiMAX

针对全微波存取全球互通(WiMAX)系统的实时业务,提出了一种新的基于流量预测的自适应带宽申请机制.该机制依据系统的历史流量数据将指数平均预测和平均累计误差结合起来,对下一时刻到达WiMAX系统的数据流量进行估计,在数据流到达之前预先申请额外的带宽资源用于服务该数据流,从而减少实时业务流的时延滞后,并减轻数据流对缓冲的压力.仿真结果显示,本机制能显著改善实时业务的时延特性和减小缓冲需求.

Based on traffic prediction, a new adaptive bandwidth request mechanism for real-time traffic in worldwide interoperability for microwave access （WiMAX） is proposed. According to historical traffic of system, this algorithm combines exponential estimation with cumulative mean errors; therefore it can estimate the arrival of packets next time and request extra bandwidth for them in advance. Hence it can decrease time lags and reduce buffer for real-time traffic. Simulation results show that the proposed adaptive algorithm can provide better performance of average delay and buffer.