A novel method for analysing the performance of power saving class of Type Ⅲ in IEEE 802.16e is proposed,which is applicable to design,maintenance and management for mobile wireless metropolitan area network.Considering the memoryless nature of user initiated packet arrival,a Geom/G/1 queue model with multiple vacations and setup period is built to capture the principle for the power saving class of Type Ⅲ.By using an embedded Markov chain method and the boundary state variable theory,we obtain the queueing measures such as queueing length,waiting time and busy cycle in steady state.Correspondingly,we derive explicitly the performance measures for the power saving class of Type Ⅲ in terms of handover ratio,energy saving ratio,and average packet response time.Based on numerical results,we develop a cost function to determine numerically the optimal length of sleep window and the minimal cost with different offered loads.
设计了网络中间节点(网关和路由器)的预留轮询策略队列调度方案。对不同服务质量(qualities of service,QoS)要求的延迟敏感型和非延迟敏感型混合业务,通过调度不同业务间链路传输速率,使不同业务得到不同等级的服务;建立了混合业务预留轮询策略的队列调度三维马尔可夫排队模型,使用拟生灭过程和矩阵几何解的方法对该模型进行分析,得到了系统的主要性能指标:第一类非延迟敏感型业务和第二类延迟敏感型业务的平均队长、等待时间和吞吐量。给出了第二类延迟敏感型业务的阻塞概率等结果。
