Femtocell基站休眠机制研究

Analysis of the Sleep-Mechanism for Femtocell

Femtocell基站是解决蜂窝覆盖问题的一种有效途径,然而Femtocell基站大能耗已成为一个紧迫的问题。分析了Femtocell基站传统的固定周期休眠机制算法,提出了两种改进的自适应休眠机制。其设计思想分别为:改进方案A通过引入休眠周期因子改变增长倍数,动态调整休眠周期;改进方案B通过上一次休眠周期状态的阶数来确定初始休眠的间隔时间,降低休眠模式下的能量消耗。并对两种改进的休眠方案进行Markov分析和Matlab仿真,结果表明,两种改进休眠方案均有比较大的能量改善,改进方案A比较适应环境变化小、通话率高的单基站通信;改进方案B能在通话率波动比较大的范围内保持良好性能,且性能最好,适应多基站协作的通信。

Femtocell is an effective way to solve the problem of cellular coverage, but Femtocell energy consumption has become an urgent problem. Traditional fixed-cycle sleep mechanism algorithm of Femtocell is analyzed, and two improved adaptive sleep mechanisms are proposed. In fact, the design ideas are： in improved program A, by introducing the sleep cycle factor to change the growth factor, the sleep cycle is dynamically adjusted; in improved program B, through the last sleep cycle state order to determine the initial sleep interval time, the sleep mode of energy consumption is reduced. The results show that there are relatively large energy improvements in the two improved dormancy schemes. The improved scheme A is more suitable for single base station communication with small change of environment and high call rate. The improved scheme B can maintain good performance in the range of relatively large fluctuations in call rate, gain best performance, and adapt to multi-base station collaboration communication.