LTE中DRX节能策略的系统建模及性能优化

System modeling and performance optimization for the power saving strategy of DRX in LTE

兼顾LTE(Long term evolution)通信技术中移动终端的节能效果和响应速度,提出了一种带有休眠延迟机制的非连续接收DRX(Discontinuous reception)节能策略。考虑到网络中实际缓存容量的有限性,建立了一个带有休假延迟和启动阶段的多重休假有限容量排队模型,综合使用嵌入Markov链方法和补充变量的方法,导出系统阻塞率、能量节省率和数据帧延迟等指标表达式。结合数值实验和仿真实验,揭示了不同指标之间的折衷关系。对DRX中的休眠延迟器长度和系统容量大小进行了优化设置,为无线通信网络节能策略的改进及优化提供了理论依据。

In order to reduce the energy consumption and increase the response speed of the mobile stations in Long Term Evolution（LTE）communication technology,a novel power saving strategy is proposed in Discontinuous Reception（DRX）with sleep-delay mechanism.Considering that the system buffer is finite in practice,a multiple-vacation queuing model with a sleep-delay period and a wakingup procedure is built.Using the methods of embedded Markov chain and supplemental variable,the formulas of the system block ratio,the energy saving ratio and the latency of data frames are given.Combining the numerical experiments with analysis and simulation,the trade-off between different performance measures is investigated.Finally,the time length of the sleep-delay period and the buffer capacity in DRX are optimized.The results of this research have potential applications in the improvement and optimization of the energy saving strategy in wireless communication networks.