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Understanding precision time protocol in today's Wi-Fi networks: A measurement study
2021-07-01
会议录名称2021 USENIX ANNUAL TECHNICAL CONFERENCE
页码597-610
发表状态已发表
DOI
摘要

Emerging mobile applications involving distributed control and sensing call for accurate time synchronization over wireless links. This paper systematically studies the performance of Precision Time Protocol (PTP) in today's Wi-Fi networks. We investigate both software and hardware PTP implementations. Our study uncovers the root causes of software PTP synchronization errors. We show that with fine-tuned system configurations and an online calibration procedure, software PTP can achieve reasonable accuracy with off-the-shelfWi-Fi devices. Hardware PTP requires a PTP hardware timestamper clock not contained in Wi-Fi NICs. We propose a method to make use of the hardware TSF counter to emulate the PTP clock. Rigorous tests traversing various conditions show that both software and hardware PTP implementations can achieve a 1-µs level of accuracy in today's Wi-Fi networks. © 2021 USENIX Annual Technical Conference. All rights reserved.

会议录编者/会议主办者Facebook ; Google ; IBM ; USENIX ; VMware
关键词Clocks Distributed parameter control systems Internet protocols Software testing Wireless local area networks (WLAN) Distributed control Mobile applications Precision time protocols Reasonable accuracy Software and hardwares Synchronization error System configurations Time synchronization
会议名称2021 USENIX Annual Technical Conference, ATC 2021
会议地点Virtual, Online
会议日期July 14, 2021 - July 16, 2021
收录类别EI ; CPCI ; CPCI-S
语种英语
WOS记录号WOS:000696708600039
出版者USENIX Association
EI入藏号20213210725248
EI主题词Wi-Fi
EI分类号723 Computer Software, Data Handling and Applications ; 723.5 Computer Applications ; 731.1 Control Systems ; 943.3 Special Purpose Instruments
原始文献类型Proceedings Paper
文献类型会议论文
条目标识符https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/133531
专题信息科学与技术学院_硕士生
信息科学与技术学院_PI研究组_杨智策组
通讯作者Chen, Paizhuo; Yang, Zhice
作者单位
School of Information Science and Technology, ShanghaiTech University, China
第一作者单位信息科学与技术学院
通讯作者单位信息科学与技术学院
第一作者的第一单位信息科学与技术学院
推荐引用方式
GB/T 7714
Chen, Paizhuo,Yang, Zhice. Understanding precision time protocol in today's Wi-Fi networks: A measurement study[C]//Facebook, Google, IBM, USENIX, VMware:USENIX Association,2021:597-610.
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