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On the Role of Feedback for Industrial Networks Using Relaying and Packet Aggregation
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0001-9589-6986
University of Canterbury, Canterbury, New Zealand.
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. Halmstad University, Halmstad, Sweden.ORCID iD: 0000-0001-6497-4099
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0002-2419-2735
2013 (English)Report (Other academic)
Abstract [en]

To be accepted for use in industrial applications, wireless technologies must offer similar performance in terms of reliability and timeliness as provided by current wired solutions. Wireless channels, introducing time-varying packet error rates, impose a significant challenge to fulfill these requirements. One way to improve reliability in industrial wireless networks is to use relaying, whereas packet aggregation is a method that can reduce delay. Hence, in this paper, we propose to use a combination of relaying and packet aggregation. Based on the type of feedback provided by the controller, the relay node can choose the most suitable way to use its allocated time slots such that more packets can reach the controller before their deadlines. The results show that allowing this kind of flexibility at the relay node results in performance improvements. The more flexibility, the greater the gain, and thus further improvements can be made by adjusting the schedule to take different types of feedback into account.

Place, publisher, year, edition, pages
Mälardalen University , 2013.
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:mdh:diva-20345ISRN: MDH-MRTC-281/2013-1-SEOAI: oai:DiVA.org:mdh-20345DiVA: diva2:638001
Conference
in submission
Available from: 2013-07-24 Created: 2013-07-24 Last updated: 2015-11-13Bibliographically approved
In thesis
1. Cooperative Communication for Increased Reliability in Industrial Wireless Networks
Open this publication in new window or tab >>Cooperative Communication for Increased Reliability in Industrial Wireless Networks
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Introducing wireless networks into distributed industrial systems may enable new or improved application areas and also great cost reductions due to lower complexity of installation and maintenance, compared to existing wired solutions. However, signals travelling through wireless channels are affected by pathloss, fading and shadowing, and, as a result, packet errors are both time-varying and more frequent than in e.g., existing wired fieldbuses. Packet errors or delays occurring in industrial systems can, in critical situations, lead to damage of expensive equipment or even danger to human life. Thus, wireless networks can be accepted for use in industrial networks only when sufficient levels of reliability and timeliness can be guaranteed.

Relaying is a technique that has the potential to increase reliability with maintained delay. Having different geographical locations, and thus different wireless channel qualities, some nodes may overhear transmitted packets even in cases when the intended receiver did not, and then cooperate by relaying these packets to their final destination.

This thesis deals with design of relaying strategies aiming to increase reliability in deadline-constrained industrial applications using wireless networks. The influence of several different parameters, such as positions of relay nodes, number of erroneous packets at the relay node and at the destination respectively, as well as the number of available time slots before the deadline, are evaluated to determine the best acting strategy for each relay node. Moreover, it is shown that when a specific relay node has the opportunity to aid more than one source node, performance can be improved even further if the relay node combines several packets, using Luby coding or packet aggregation, and instead relays such combined packets. Given the methods proposed in this thesis, the reliability in industrial wireless networks can be enhanced considerably, without increasing the delay, such that message deadlines still are kept.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2013
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 171
National Category
Communication Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:mdh:diva-20960 (URN)978-91-7485-118-2 (ISBN)
Presentation
2013-10-04, Kappa, Mälardalens högskola, Västerås, 10:15 (English)
Opponent
Supervisors
Available from: 2013-08-20 Created: 2013-08-19 Last updated: 2013-12-03Bibliographically approved

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