【作者】 李然然；

【导师】 金顺福；

【作者基本信息】 燕山大学 ， 计算机系统结构， 2010， 硕士

【摘要】 为了提高移动终端的能量使用效率,支持无线宽带城域网的IEEE 802.16e标准提出了三种休眠模式。本文基于现代网络中的UGS(Unsolicited Grant Service)和RT-VR(Real-Time Variable Rate)类型的业务,对节能类型II进行了研究。首先,基于经典的节能类型II的工作原理,将侦听窗口内传输数据帧之前的阶段抽象为唤醒延迟,传输数据帧的阶段抽象为忙期,建立带有唤醒延迟的多重休假排队模型,给出数据帧平均响应时间的表达式。将侦听窗口内传输数据帧的阶段抽象为一种特殊休假期,建立一种具有两种休假机制,且在一种休假机制内可以传输数据帧的多重休假排队模型,给出经典的节能类型II的性能指标表达式。其次,为了避免休眠状态与唤醒状态之间的频繁切换,将休眠延迟机制引入到经典的节能类型II中,提出一种改进的节能类型II的休眠策略。建立带有休假延迟与唤醒延迟的多重休假排队模型,及带有休假延迟与两种休假机制,且在一种休假机制内可以传输数据帧的多重休假排队模型,给出改进的节能类型II的性能指标表达式。最后,基于经典的节能类型II和改进的节能类型II,综合考虑能量节省率、系统切换率和数据帧平均响应时间等性能指标,分别建立成本函数,并给出休眠窗口的优化设置方案。通过数值例子,定量刻画了系统负载对性能指标的影响,通过系统仿真,验证改进的节能类型II的有效性。更多还原

【Abstract】 To improve the energy efficiency of the mobile station, in wireless broadband metropolitan area network, IEEE 802.16e standard propose three kinds of sleep modes. In this paper, we study power saving class of type II, which is recommended for Unsolicited Grant Service (UGS) and Real-Time Variable Rate (RT-VR) traffics in modern wireless network.Firstly, according to the work principle of the conventional power saving class of type II, the time period before transmitting data frames in the listen window is seen as an awake-delay, and the time period for transmitting data frames is seen as a busy period, a multiple vacation queueing model with an awake-delay is built. The formula for the average response time of data frames is given. The time period for transmitting data frames in the listen window is seen as a special vacation, a multiple vacation queueing model with two kinds of vacation mechanisms, during one of the vacation mechanisms, some data frames could be transmitted. The performance measures for the conventional power saving class of type II are given.Secondly, in order to avoid frequent switches between the awake state and the sleep state, we introduce a sleep-delay mechanism into the conventional power saving class of type II, and propose an enhanced power saving class of type II. Based on the multiple vacation queueing models used in the conventional power saving class of type II, we built two multiple vacation queueing models with vacation-delay. The performance measures for the enhanced power saving class of type II are given.Finally, considering the energy saving ratio, the system handover and the average response time of data frames, two different cost functions are built to describe the conventional power saving class of type II and the enhanced power saving class of type II, respectively. The optimal value for the sleep window size is given. With numerical results, the influence of the system load on the system performance is numerically evaluated, and the validity of the enhanced power saving class of type II is verified.更多还原