基于MIMO模式选择的IEEE802.11n节能算法

IEEE 802.11n power-saving algorithm based on MIMO mode selecting

多入多出(multiple input multiple output,MIMO)是IEEE 802.11n的重要特征,其利用空分复用技术提升系统吞吐量,但同时也带来了新的问题,即MIMO技术的使用会大幅增加通信终端的能耗。IEEE 802.11n标准中增加了空分复用节能机制,但该机制只针对接收端的节能,对于发送端没做任何规定。针对这一问题,该文研究了IEEE 802.11n发送端的能耗问题,提出了一种基于MIMO模式选择的发送端节能算法。该算法以单位比特能耗为优化目标,根据聚合帧大小和已有速率自适应模块的统计信息预测每个MIMO模式的单位比特能耗,据此为每一个待发送的聚合帧动态地选择能效最优的MIMO模式,进而达到优化发送端能耗的效果。基于真实实验数据的数值分析结果表明:该算法能够很好地优化发送能耗,同时降低对系统吞吐量的影响。

Multiple input multiple output（MIMO） is a key physical mechanism of the IEEE 802.11n.MIMO utilizes spatial multiplexing to improve system throughput,but this causes the MIMO communications to dramatically increase the terminal energy overhead.Spatial multiplexing power saving（SMPS） in the IEEE 802.11n standard is only for the receiver,with nothing for the sender.This paper considers the sender energy efficiency in the IEEE 802.11n with a power-saving algorithm for the IEEE 802.11n sender based on MIMO mode selecting.The algorithm uses the energy per-bit as the optimization object and predicts the optimal MIMO mode according to the size of the aggregate frame and statistical information for existing rate adaptation modules.The algorithm chooses the optimal energy efficiency MIMO mode based on the prediction results to optimize the sender energy use.Trace-driven analysis results show that the algorithm effectively optimizes power use with little impact on throughput.