WiMAX拓展实时轮询调度机制分析

Research on Extended Realtime Polling Scheduling Scheme in WiMAX

为了提高无线资源的利用率,使WiMAX系统更好地支持语音业务,基于IEEE 802.16e协议的QoS调度体系,提出了针对带有静默压缩语音业务的拓展实时轮询调度机制的具体实现方案。而且通过对方案中关键参数的分析,给出了一种QoS保证方法。方法根据用户时延对数据带宽分配进行补偿,并按照用户负载情况动态地调整轮询请求带宽的分配周期。使用OPNET软件进行了系统级性能评估,结果表明所提出的方法可有效地降低用户上行接入时延和上行丢包率,从而提高了通信质量。

In order to improve the utilization ratio of wireless resource and support the voice traffic better in WiMAX system, this paper gives an implementation scheme of the extended real - time polling uplink scheduling scheme for voice traffic with silence suppression based on the QoS scheduling system in IEEE 802.16e. Moreover, through analyzing the crucial parameters of the proposed scheme, a method for QoS assurance is proposed. This method compensates the bandwidth allocation for data according to user＇ s delay, and adjusts the interval of uplink polling in terms of network load. System level evaluations with OPNET software are presented to illustrate the performance of the proposed scheme, which shows that the proposed method can effectively reduce uplink access delay and uplink packet loss rate, and consequently improve the communication quality.