Enhanced Timestamping Method for Subnanosecond Time Synchronization in IEEE 802.11 Over WLAN Standard Conditions

Cyber physical systems are based on a number of nodes connected through a communication network, which can interact with the environment. In this chapter, a completely open-source architecture of a cyber physical system based on off-the-shelf components will be presented. Its main characteristics are high real-time capabilities and the use of both wired and IEEE 802.11 wireless technologies for communication. The Linux operating system installed on common personal computers and communication technologies derived from the IT world make the proposed architecture highly customizable, inexpensive, and performing. Moreover, the presence of a time synchronization service allows the sharing of time between nodes. Specific software and techniques, some based on synchronized nodes, are used to increase determinism and reliability in both wired and wireless extensions.

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Time synchronization for M-WiMAX femtocells using IEEE 802.11 based wireless backhaul

IEICE Electronics Express ◽

10.1587/elex.8.795 ◽

2011 ◽

Vol 8 (11) ◽

pp. 795-801

Author(s):

Jihoon Choi ◽

Jae Yeun Yun ◽

Hyukjun Oh

Keyword(s):

Ieee 802.11 ◽

Time Synchronization ◽

Wireless Backhaul

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A modified time synchronization function in IEEE 802.11 using differentiated contention window

Fourth International Conference on Information, Communications and Signal Processing, 2003 and the Fourth Pacific Rim Conference on Multimedia. Proceedings of the 2003 Joint ◽

10.1109/icics.2003.1292625 ◽

2004 ◽

Cited By ~ 3

Author(s):

M.H. Ye ◽

C.T. Lau ◽

A.B. Premkumar

Keyword(s):

Ieee 802.11 ◽

Time Synchronization ◽

Contention Window

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Architecture of an Open-Source Real-Time Distributed Cyber Physical System

Encyclopedia of Information Science and Technology, Fourth Edition ◽

10.4018/978-1-5225-2255-3.ch106 ◽

2018 ◽

pp. 1227-1237

Author(s):

Stefano Scanzio

Keyword(s):

Operating System ◽

Communication Network ◽

Open Source ◽

Real Time ◽

Ieee 802.11 ◽

Physical System ◽

Time Synchronization ◽

Communication Technologies ◽

Cyber Physical System ◽

Wireless Technologies

Cyber Physical Systems are based on a number of nodes connected through a communication network, which can interact with the environment. In this chapter, a completely open-source architecture of a cyber physical system based on off-the-shelf components will be presented. Its main characteristics are high real-time capabilities and the use of both wired and IEEE 802.11 wireless technologies for communication. The Linux operating system installed on common personal computers and communication technologies derived from the IT world make the proposed architecture highly customizable, inexpensive and performing. Moreover, the presence of a time synchronization service allows the sharing of time between nodes. Specific software and techniques, some based on synchronized nodes, are used to increase determinism and reliability in both wired and wireless extensions.

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IEEE 802.11-Based Wireless Sensor System for Vibration Measurement

Advances in Civil Engineering ◽

10.1155/2010/631939 ◽

2010 ◽

Vol 2010 ◽

pp. 1-9 ◽

Cited By ~ 2

Author(s):

Yutaka Uchimura ◽

Tadashi Nasu ◽

Motoichi Takahashi

Keyword(s):

Ieee 802.11 ◽

Time Synchronization ◽

Vibration Measurement ◽

Wireless Sensor ◽

Wireless Sensing ◽

High Rise ◽

Network Time ◽

New Applications ◽

Wireless Sensing System ◽

Synchronization Accuracy

Network-based wireless sensing has become an important area of research and various new applications for remote sensing are expected to emerge. One of the promising applications is structural health monitoring of building or civil engineering structure and it often requires vibration measurement. For the vibration measurement via wireless network, time synchronization is indispensable. In this paper, we introduce a newly developed time synchronized wireless sensor network system. The system employs IEEE 802.11 standard-based TSF-counter and sends the measured data with the counter value. TSF based synchronization enables consistency on common clock among different wireless nodes. We consider the scale effect on synchronization accuracy and evaluated the effect by taking beacon collisions into account. The scalability issue by numerical simulations is also studied. This paper also introduces a newly developed wireless sensing system and the hardware and software specifications are introduced. The experiments were conducted in a reinforced concrete building to evaluate synchronization accuracy. The developed system was also applied for a vibration measurement of a 22-story steel structured high rise building. The experimental results showed that the system performed more than sufficiently.

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