物联网学报 ›› 2019, Vol. 3 ›› Issue (3): 50-61.doi: 10.11959/j.issn.2096-3750.2019.00119
田乐,胡宇翔,韩伟涛
修回日期:
2019-08-08
出版日期:
2019-09-30
发布日期:
2019-10-14
作者简介:
田乐(1987- ),男,陕西咸阳人,博士,信息工程大学助理研究员,主要研究方向为IEEE 802.11ah等面向物联网的低功耗无线传输技术、可编程网络及未来网络关键技术。|胡宇翔(1982- ),男,河南周口人,博士,信息工程大学副教授,主要研究方向为未来网络关键技术、网络智慧化等。|韩伟涛(1989- ),男,河北石家庄人,博士,信息工程大学助理研究员,主要研究方向为网络空间安全、无线通信、复杂系统、统计物理等。
基金资助:
Le TIAN,Yuxiang HU,Weitao HAN
Revised:
2019-08-08
Online:
2019-09-30
Published:
2019-10-14
Supported by:
摘要:
最新推出的Wi-Fi标准IEEE 802.11ah又称为Wi-Fi HaLow,是一种支持大规模网络的低功耗物联网通信技术,主要应用于智能家居、医疗健康、车联网、工业流程控制、物流与资产管理、智慧农业和智慧城市等领域。首先介绍了HaLow标准,重点描述了为支持物联网而引入的新机制,进而梳理并分析了HaLow相关的研究工作。在此基础上,探讨了目前面向物联网的Wi-Fi HaLow技术仍存在的问题及挑战。
中图分类号:
田乐,胡宇翔,韩伟涛. 面向物联网的Wi-Fi HaLow技术研究[J]. 物联网学报, 2019, 3(3): 50-61.
Le TIAN,Yuxiang HU,Weitao HAN. Research on Wi-Fi HaLow for the Internet of things[J]. Chinese Journal on Internet of Things, 2019, 3(3): 50-61.
表2
HaLow的MCS和数据速率"
MCS | 调制 | 编码速率 | 数据速率/(kbit.s-1) | |
1 MHz | 2 MHz | |||
0 | BPSK | 1/2 | 300 | 650 |
1 | QPSK | 1/2 | 600 | 1 300 |
2 | QPSK | 3/4 | 900 | 1 950 |
3 | 16-QAM | 1/2 | 1 200 | 2 600 |
4 | 16-QAM | 3/4 | 1 800 | 3 900 |
5 | 64-QAM | 2/3 | 2 400 | 5 200 |
6 | 64-QAM | 3/4 | 2 700 | 5 850 |
7 | 64-QAM | 5/6 | 3 000 | 6 500 |
8 | 256-QAM | 3/4 | 3 600 | 7 800 |
9 | 256-QAM | 5/6 | 4 000 | / |
10 | BPSK | 1/2,2倍重复 | 150 | / |
表3
HaLow中MAC层的主要功能"
功能 | 特性 | 描述 |
基础功能 | DCF/PCF/EDCA/HCCA | 信道竞争 |
低控制开销 | 短报文头部(short MAC header)* | 减少报文头部开销 |
响应指示延后(RID,response indication deferral)* | 配合短报文头部 | |
报文聚合(frame aggregation) | 减少信道竞争开销 | |
块确认(block acknowledgment) | 减少确认报文传输开销 | |
多用户聚合(multi user aggregation) | 减少信道竞争开销 | |
空数据分组(null data packet) | 减少控制报文开销 | |
大规模接入 | 受限访问窗口(RAW,restricted access window)* | 减少信道竞争,用于关联完成后 |
快速关联(fast association)* | 减少关联时的信道竞争 | |
分区分组(group sectorization) * | 减少数据传输时的信道竞争 | |
基本服务集着色(BSS color)* | 空间复用,适用于高密度场合 | |
低功耗 | TIM 分段(TIM segmentation)* | 减少TWT,适用于下行传输 |
TWT* | 自定义节点唤醒及睡眠时间 | |
短信标(short beacon)* | 减少信标传输功耗 |
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