IEEE802.16e睡眠模式的改进和硬件设计

Improvement and hardware design of sleep mode in IEEE 802.16e

IEEE802.16e标准支持终端的移动性,能量消耗成为非常重要的问题,因此,标准提出了节能机制睡眠模式减少移动站点(MS)的功率消耗。草案中提出的睡眠窗口指数增长算法在低业务量情况下,响应时间过长。提出了指数加权滑动增长算法解决这一问题,理论分析了新算法的平均响应时间和平均消耗能量两性能指标,对算法进行了硬件设计和整体系统的硬件结构设计,通过仿真对比了这两种算法的性能,证实后者在现实应用环境下具有较好的性能。进一步分析了睡眠模式各参数对上述性能指标的影响,对参数值的选取有参考价值。

The IEEE 802.16e support mobility.Energy saving becomes important.So,sleep mode mechanism comes up to conserve the power of the Mobile Stations（MS）.The exponential increase algorithm of sleep mode consumes long response time in low traffic scenario.This paper presents exponential weight smooth increase algorithm to solve this problem.Average response time and average energy consumption are two performance measurements.The hardware design of sleep_time_caeulator and the whole system＇s hardware framework are designed.By simulation,the two algorithms are compared and the conclusion is that the latter one has better performance,and then the above two performance measurements are analyzed over each parameter of sleep mode and experimental results are given.The conclusion will be helpful to select the value of parameters.