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The Effects of Relay Behavior and Position in Wireless Industrial Networks
Mälardalens högskola, Akademin för innovation, design och teknik. (ES)ORCID-id: 0000-0001-9589-6986
Halmstad University.ORCID-id: 0000-0001-6497-4099
Mälardalens högskola, Akademin för innovation, design och teknik. (ES)ORCID-id: 0000-0002-2419-2735
2012 (engelsk)Inngår i: 2012 9th IEEE International Workshop on Factory Communication Systems, May 21-24, 2012 Lemgo, Germany: Proceedings, 2012, s. 183-190Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

In wireless industrial networks, providing reliable and timely communication is crucial. Previous research has shown that relaying can be used to achieve this goal. However, we have found that different types of wireless channels encountered in industrial environments affect the benefits as well as the best behavior and position of relay nodes. We consider two types of behavior: the relay node always retransmits or it only retransmits if it has obtained a correct copy of the packet. We evaluate different positions of the relay node by conducting simulations for two types of fading channels: with and without line of sight. The results clearly show that the benefits, the best behavior and position of a relay node depends on the wireless channel, whether or not the bit errors appear randomly or in bursts and also on the distance between the source and the final destination.

sted, utgiver, år, opplag, sider
2012. s. 183-190
HSV kategori
Identifikatorer
URN: urn:nbn:se:mdh:diva-16488DOI: 10.1109/WFCS.2012.6242566Scopus ID: 2-s2.0-84866506225ISBN: 978-1-4673-0693-5 (tryckt)OAI: oai:DiVA.org:mdh-16488DiVA, id: diva2:575450
Konferanse
9th IEEE international workshop on factory communication sustems (WFCS)
Tilgjengelig fra: 2012-12-10 Laget: 2012-12-10 Sist oppdatert: 2015-12-08bibliografisk kontrollert
Inngår i avhandling
1. Cooperative Communication for Increased Reliability in Industrial Wireless Networks
Åpne denne publikasjonen i ny fane eller vindu >>Cooperative Communication for Increased Reliability in Industrial Wireless Networks
2013 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Västerås: Mälardalen University, 2013
Serie
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 171
HSV kategori
Forskningsprogram
datavetenskap
Identifikatorer
urn:nbn:se:mdh:diva-20960 (URN)978-91-7485-118-2 (ISBN)
Presentation
2013-10-04, Kappa, Mälardalens högskola, Västerås, 10:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2013-08-20 Laget: 2013-08-19 Sist oppdatert: 2013-12-03bibliografisk kontrollert
2. Relaying for Industrial Wireless Networks
Åpne denne publikasjonen i ny fane eller vindu >>Relaying for Industrial Wireless Networks
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The interest in wireless technology for industrial applications has increased dramatically over the last few years. Wireless communication can reduce cost and complexity, enable mobility and provide much higher flexibility than its wired counterparts. However, to be considered for use in practice, wireless systems must provide sufficient levels of timeliness and reliability as required by industrial applications, while keeping reasonable levels of complexity as well as interoperability with existing wired networks. Wireless channels, characterized by pathloss, noise, multipath fading and shadowing, imply a particular challenge to fulfill the requirements on timely and reliable communication. To this end, this thesis work proposes and evaluates a number of techniques able to increase the reliability of wireless communication systems without causing excessive or unpredictable delays. In addition, all proposed solutions are implementable on top of commercially available devices, i.e., they require no large alteration of the standard IEEE 802.15.4 and minimal changes to the current infrastructure to be compatible with existing industrial communication systems. First, the characteristics of industrial communication environments are determined. Then, suitable models to approximate them are selected, since the effectiveness of different error control schemes able to increase reliability depends on the type of wireless channel encountered. Next, different possibilities for reliability improvements in wireless industrial networks, while subject to strict timing constraints, are evaluated. Based on this, relaying that has been proven to be beneficial for traditional wireless networks is evaluated for applicability in industrial systems. Finally, several different relaying strategies that are implementable at the link layer on top of existing chipsets are developed and evaluated. Depending on the specific type of industrial application and its corresponding performance metrics, relaying is combined with network coding, forward error control codes, packet aggregation and packet combining techniques – all of which support increased reliability with maintained delay, at reasonable complexity investments. To complete the framework, scheduling schemes tailored to various relaying protocols are also developed.

sted, utgiver, år, opplag, sider
Västerås: Mälardalen University, 2016
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 197
HSV kategori
Forskningsprogram
datavetenskap
Identifikatorer
urn:nbn:se:mdh:diva-29859 (URN)978-91-7485-247-9 (ISBN)
Disputas
2016-02-08, Zeta, Mälardalens högskola, Västerås, 13:15 (engelsk)
Opponent
Tilgjengelig fra: 2015-12-08 Laget: 2015-12-08 Sist oppdatert: 2018-01-10bibliografisk kontrollert

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