IEEE 802.16e节能类型Ⅲ的性能分析

Performance Analysis for Power Saving of Type Ⅲ in IEEE 802.16e

基于IEEE802.16e节能类型Ⅲ的工作原理,考虑用户触发数据的无后效性,建立一个带有多重休假的Geom/G/1排队模型。利用嵌入式马尔可夫链方法推导出该排队系统的稳态指标,相应给出数据帧平均响应时间、能量节省率等性能指标的表达式。构造一个综合考虑能量节省与系统响应时间的成本函数,通过数值例子说明系统性能指标对休眠窗口长度的依赖关系,给出不同负载下休眠窗口长度的最优值。

Based on the mechanism for power saving of type Ⅲ in IEEE 802.16e, this paper takes into account the memoryless nature of user initiated packet arrival, to build a Geom/G/1 queue with multiple vacation. By using an embedded Markov chain method, some queue system measurements are derived. Correspondingly, the formula of system measures in terms of the average packet response time and energy saving ratio are presented. Considering both the energy saving and the system response time, it develops a cost function. Numerical results are given to demonstrate the dependency relationships between the system measures and sleep length, and the optimum lengthes of sleep mode for different offered loads are given.