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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 | 无 |
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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