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Low Jitter Scheduling for Industrial Wireless Sensor and Actuator Networks
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. (IS (Embedded Systems))
ABB AB, Corporate Research.
ABB AB, Corporate Research.ORCID iD: 0000-0002-7159-7508
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0002-2419-2735
2013 (English)In: 39TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2013): 39th Annual Conference of the IEEE Industrial Electronics Society, 2013, 5594-5599 p.Conference paper (Refereed)
Abstract [en]

Applying Industrial Wireless Sensor and Actuator Networks (IWSANs) in the industrial automation is a growing trend due to flexibility, mobility and low cost. According to the current standards, such as WirelessHART and ISA100.11a, multi-channel TDMA transmission is included for reliable and deterministic communication. In this paper, we clarify the dependence of TDMA scheduling for sensors and actuators and point out the low correlation between the scheduling delay and the overall quality of control, and focus on reducing jitter in scheduling for improving quality of control and system stability. We propose a scheduling algorithm, aiming for lowing jitter and compare it with two traditional real-time scheduling schemes. Our simulation results exhibit significantly lower jitters by applying our scheduling policy than those two traditional scheduling schemes.

Place, publisher, year, edition, pages
2013. 5594-5599 p.
, IEEE Industrial Electronics Society, ISSN 1553-572X
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:mdh:diva-22290DOI: 10.1109/IECON.2013.6700050ISI: 000331149505074ScopusID: 2-s2.0-84893585069ISBN: 978-1-4799-0224-8OAI: diva2:661136
IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 10 Nov - 13 Nov 2013, Vienna
Available from: 2013-10-31 Created: 2013-10-31 Last updated: 2014-12-15Bibliographically approved
In thesis
1. On Reliable and Deadline-Constrained Communication in Wireless Industrial Networks
Open this publication in new window or tab >>On Reliable and Deadline-Constrained Communication in Wireless Industrial Networks
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Along with the quick development of wireless communication technologies, industrial automation networks are also in unceasing evolution. Industrial wireless sensor and actuator networks (IWSAN) have been increasingly adopted in industrial automation systems. Although there are a number of advantages of replacing cables with wireless links, such as cost reduction, enhanced scalability and flexibility, the stringent requirements on communication reliability and meeting firm deadlines from industrial mission-critical applications must still be fulfilled. Also, transmissions over wireless channels in industrial environments are prone to noise and interferences, resulting in frequent erroneous packet deliveries. Although industrial automation systems are usually designed to be tolerant of certain communication errors, successive transmission failures may still cause downtime of industrial applications, which might lead to significant economic losses or even serious accidents. This thesis addresses the problems mentioned above and aims to provide reliable and deadline-constrained communication via IWSANs for industrial automation systems. On the MAC layer, existing IWSAN standards utilize automatic repeat request (ARQ) to improve reliability at the cost of additional transmission latency. An alternative method is to use Forward Error Correction (FEC) schemes to provide reliable communication by recovering erroneous data and avoiding unnecessary retransmissions. On the MAC layer, Time Division Multiple Access (TDMA) is usually applied in current IWSAN standards for collision-free and deterministic communication. An inappropriate scheduling scheme may introduce high transmission jitter and degrade the quality of control. On the network layer, routing protocols play an important role in both communication reliability and latency. Existing solutions are either hardly able to fulfill all stringent requirements from the mission-critical industrial applications, too complicated to be realized, or lack verification in reality. The contributions of this thesis consist of (i) the possibilities of using FEC schemes in IWSANs is explored under the requirements of existing standards on the MAC layer. A compatible and flexible FEC scheme on the MAC layer for IWSANs that does not violate the standard is proposed and evaluated by simulations. (ii) To guarantee an acceptable control quality, a TDMA scheduling scheme is presented aiming for low communication jitter, and it is compared to classic scheduling schemes. (iii) The advantages of exploiting flooding in IWSANs is discussed; a reliable controlled flooding-based routing protocol is proposed and compared to both traditional routing protocols and other flooding-based protocols. (iv) A complete IWSAN platform is built and the whole protocol stack is implemented. Measurements were conducted in a real industrial environment to verify the correctness of the proposed solution.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2014
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 167
National Category
Communication Systems
Research subject
Computer Science
urn:nbn:se:mdh:diva-26165 (URN)978-91-7485-171-7 (ISBN)
Public defence
2014-12-08, Delta, Mälardalens högskola, Västerås, 13:15 (English)
Available from: 2014-10-23 Created: 2014-10-23 Last updated: 2014-11-14Bibliographically approved

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