下一代WLAN高能效目标唤醒时间调度策略  

High Energy Efficiency Target Wake Time Scheduling Scheme for Next Generation WLANs

作　　者：陈清华 梁国喜[2] CHEN Qing-hua;LIANG Guo-xi(School of Computer Science and Technology,Zhejiang University of Technology,Hangzhou 310014,China;Department of Information Technology,Wenzhou Vocational&Technical College,Wenzhou 325035,China)

机构地区：[1]浙江工业大学计算机科学与技术学院,杭州310014 [2]温州职业技术学院信息技术系,浙江温州325035

出　　处：《小型微型计算机系统》2020年第3期581-586,共6页Journal of Chinese Computer Systems

基　　金：浙江省教育厅一般科研项目(Y201840791)资助;温州市科技局项目(G20180006)资助.

摘　　要：为应对密集部署,下一代无线局域网协议中结合正交频分复用多址的多用户传输机制提出广播目标唤醒时间来优化节能需求情境下的网络性能.然而,不合理的休眠时间调度必然引起负载不均衡导致低吞吐率、低能效的问题.文中提出了目标信标帧传输时间调度方案.本方案通过对侦听间隔性质分析、归类,目标信标帧传输时间分组以及初始索引的飘移,实现了在一个信标帧时槽内同时醒来站点数的均衡化控制.理论分析给出了最大和平均同时醒来站点个数的界限,同时为后续广播目标唤醒时间的优化资源调度提供了必要条件.仿真结果表明,所提方案具有更高的吞吐率、能效和更小的丢包率.The next generation Wireless Local Area Networks( WLANs),which are designed for dense environments,propose the broadcast Target Wake Time( TWT) power saving mechanism to leverage the multiuser transmission capability based on Orthogonal Frequency Division Multiple Access( OFDMA) technology. In order to solve the problem of low throughput and energy efficiency caused by contention-based channel access mechanism,a listen interval grouping based Target Beacon Transmission Time( TBTT)scheduling scheme( GTSS) is proposed by analyzing and classifying the listen intervals requested,intra-grouping and drift-grouping to make the number of simultaneously active stations in a sound range. The scheme is further analyzed theoretically to get maximal and average awake STA number at a beacon time. Simulation results demonstrate that the proposed scheme achieves higher throughput,energy efficiency and lower frame loss ratio.

关 键 词：IEEE 802.11ax 无线局域网 节能模式 目标唤醒时间 正交频分复用多址 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]