宽带城域网中节能机能Ⅰ的性能分析

摘要

In mobile broadband MAN, how to control energy consumption is one of the most important issues for mobile stations. IEEE 802.16e proposes an energy saving mechanism named as sleep mode for mobile stations. Based on power saving class of type Ⅰ with sleep-delay, a queuing model with multiple exponential vacations and a sleep-delay is built. By employing an embedded Markov chain method and boundary state variable theory,the queuing model is analyzed, and the expressions for the performance measures in terms of handover ratio, energy saving ratio and average response time for the power saving class of type Ⅰ are presented. In numerical results,the dependency relationships are investigated between the system performance measures and the length of the sleep-delay timer for different system loads.Furthermore, a cost function is built considering all the performance measures,and an optimal design proposal for setting the system parameters is given.%在移动宽带城域网中,如何获得更好的节能效果是移动设备面临的重要问题之一,IEEE 802.16e标准中提出称为休眠模式的节能机制.基于带有休眠延迟的节能类型Ⅰ,建立带有休假延迟且休假长度指数变化的多重休假排队模型.通过嵌入Mar-kov链方法及边界状态变体定理,对排队模型进行了分析,给出了系统切换率,能量节省率和平均响应时间等性能指标的解析表达式.通过理论分析和仿真实验刻画了不同系统负载下,系统性能指标与休眠延迟定时器长度的依赖关系.综合不同性能指标,构造成本函数,给出系统参数的优化设置方案.