Abstract: Due to the fact that the existing MAC layer of WiMAX system doesn’t provide specific schedule scheme for service with different priority, a modified DFPQ schedule algorithm is proposed. Based on the analysis of traditional hierarchical schedule algorithm, the modified schedule algorithm can solve the sudden with real-time service. In this algorithm, during allocation of bandwidth, allocating part of the bandwidth in low priority service to real-time service by determining the sudden incresement of real-time service. Using GloMoSim network simulation environment, simulation results show that the modified schedule strategy can meet the QoS requirements of various services and it’s superior to the traditional hierarchical schedule policy.

Key words: WiMAX, hierarchical schedule, DFPQ algorithm, Quality of Service(QoS)

摘要： 针对现有WiMAX系统MAC层没有提供不同优先级业务具体调度方案的现状，在分析传统分级调度算法的基础上，提出一种针对实时业务突发性的改进DFPQ调度算法实现方案。该方案在带宽分配过程中，通过判断实时业务突发性增多，强制将低优先级业务的一部分带宽分配给实时业务。GloMoSim网络仿真环境下的仿真结果证明，该调度策略在满足各业务QoS要求方面优于传统分级调度策略。

关键词: WiMAX系统, 分级调度, DFPQ算法, 服务质量

CLC Number: 

• TP393