基于分形布朗业务模型的差分队列服务建模

Modeling of Differentiated Queuing Service Based on FBM Traffic Model

差分队列服务(DQS)是一种在有线与无线融合网络中能有效提供服务质量的服务质量模型,文中基于DQS的思想,将具有相同时延要求的到达业务作为一个分形布朗运动(FBM)业务,建立了一个针对多个FBM业务及对应时延要求的差分队列服务模型,并推导出该模型下的丢包率公式.仿真结果表明,文中模型分析的结果与基于数据包粒度的仿真结果是一致的.模型性能分析结果表明,实时业务的突发性对差分队列服务的服务质量保证影响较大.

Differentiated queuing service （DQS） is a QoS （Quality of Service） model that can efficiently provide QoS for wired and wireless integrated networks. In this paper, based on the service discipline of DQS, the arriving flows with the same delay requirement are taken as an FBM （Fractional Brownian Motion） traffic, and then the DQS models with multi-class FBM traffic and with the corresponding delay requirements are established. Moreover, the formula of the packet loss is deduced according to the proposed models. It is shown that the simulated results of the proposed models are consistent with those obtained based on the packet size. Besides, the analytical results of the model performances also demonstrate that the burstiness of real-time traffic greatly affects the QoS guarantee of DQS.