面向物联网的IEEE 802.11ah低功耗技术改进  

Improvement of low power techniques in IoT-oriented IEEE 802.11ah

作　　者：傅新星[1] 苏寒松[1] 刘高华[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《陕西师范大学学报（自然科学版）》2017年第2期36-41,共6页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金(61471260)

摘　　要：针对IEEE 802.11ah协议中的功率管理问题,提出了改进的目标唤醒时间(TWT)机制,它能够在多用户场景下通过接入点管理终端的苏醒时间,使不同终端在不同时间唤醒进行传输,这样既通过减少终端的苏醒时间降低了功耗,又限制了同时接入信道的终端数量从而减少碰撞。进一步考虑非TWT终端,则由接入点根据缓存数据量分配一段未预定TWT的连续时间段对非TWT终端数据进行单独传输。实验仿真表明,该方案能够降低了终端功耗,并减少传输时延,能够更好满足物联网低功耗应用需求。In order to solve power management technology in IEEE 802.11 ah, an improved Tar get Wake Time （TWT） mechanism is proposed to schedule the awake time of stations in multi user scenario. TWT mechanism permits the access point （AP） to define a specific or set of times for individual stations （STA） to wake up from doze state to access the me ergy consumption Contention is also g d reatly because TWT STAs may enter doze state un diu til m. It can reduce en their TWT arrives. ecreased since simultaneous transmission is avoided. Considering that not all STAs are TWT-functioned, AP allocates a non-TWT period of time for non-TWT STAs accord- ing to their buffered traffic. Simulation results show that the improved TWT mechanism has greatly reduced energy consumption and transmission delay, which can meet the requirements of loT applications.

关 键 词：物联网 低功耗 多用户 目标唤醒时间 传输时延 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]