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Cooperative Communication for Increased Reliability in Industrial Wireless Networks
Mälardalen University, School of Innovation, Design and Engineering.ORCID iD: 0000-0001-9589-6986
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: urn:nbn:se:mdh:diva-20960ISBN: 978-91-7485-118-2 (print)OAI: oai:DiVA.org:mdh-20960DiVA, id: diva2:641876
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
List of papers
1. The Effects of Relay Behavior and Position in Wireless Industrial Networks
Open this publication in new window or tab >>The Effects of Relay Behavior and Position in Wireless Industrial Networks
2012 (English)In: 2012 9th IEEE International Workshop on Factory Communication Systems, May 21-24, 2012 Lemgo, Germany: Proceedings, 2012, p. 183-190Conference paper, Published paper (Refereed)
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.

National Category
Communication Systems
Identifiers
urn:nbn:se:mdh:diva-16488 (URN)10.1109/WFCS.2012.6242566 (DOI)2-s2.0-84866506225 (Scopus ID)978-1-4673-0693-5 (ISBN)
Conference
9th IEEE international workshop on factory communication sustems (WFCS)
Available from: 2012-12-10 Created: 2012-12-10 Last updated: 2015-12-08Bibliographically approved
2. Increased Reliability of Reduced Delay in Wireless Industrial Networks Using Relaying and Luby Codes
Open this publication in new window or tab >>Increased Reliability of Reduced Delay in Wireless Industrial Networks Using Relaying and Luby Codes
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Providing reliable and timely communication in wireless industrial networks is crucial. Previous research has shown that relaying can aid in achieving this goal. We consider the case when relay resources are sparse such that each relay needs to aid e.g., three different sensor nodes and propose to combine relaying with Luby codes. We let the relay node construct a Luby coded packet using the three source packets as input. The destination can then use the Luby coded packet to recover an erroneous or lost source packet regardless of which source that packet belonged to. The performance evaluation shows that our proposed scheme significantly increases the number of correctly received packets before the corresponding deadlines, or alternatively that high reliability can be maintained even if fewer time slots are allocated for retransmissions, thus lowering the delay.

National Category
Communication Systems
Identifiers
urn:nbn:se:mdh:diva-20342 (URN)10.1109/ETFA.2013.6648015 (DOI)2-s2.0-84890750560 (Scopus ID)9781479908622 (ISBN)
Conference
18th IEEE International Conference on Emerging Technologies and Factory Automation, 10-13 September 2013, Cagliari, Italy
Available from: 2013-07-24 Created: 2013-07-24 Last updated: 2015-12-08Bibliographically approved
3. On the Role of Feedback for Industrial Networks Using Relaying and Packet Aggregation
Open this publication in new window or tab >>On the Role of Feedback for Industrial Networks Using Relaying and Packet Aggregation
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:nbn:se:mdh:diva-20345 (URN)MDH-MRTC-281/2013-1-SE (ISRN)
Conference
in submission
Available from: 2013-07-24 Created: 2013-07-24 Last updated: 2015-11-13Bibliographically approved
4. Design of Channel Measurement Guidelines for Characterization of Wireless Industrial Environments
Open this publication in new window or tab >>Design of Channel Measurement Guidelines for Characterization of Wireless Industrial Environments
Show others...
2013 (English)Report (Other academic)
Abstract [en]

Providing reliable and timely communication in wireless industrial systems requires careful design of error control schemes able to tackle the bit error patterns typically occurring in these environments. As most error control schemes target some specific characteristics of a wireless channel, the selection of channel model is crucial for proper performance assessment. There are a number of widely used channel models, but the question of the most appropriate choice of model for industrial environments still remains largely open. Not many indoor measurement campaigns have focused on industrial environments with their own specific characteristics. In this paper we present a set of measurement guidelines aiming to characterize industrial environments such that suitable channel models can be selected to properly evaluate error control schemes targeting reliable and timely wireless communications in industrial environments. 

National Category
Communication Systems
Identifiers
urn:nbn:se:mdh:diva-20346 (URN)MDH-MRTC-280/2013-1-SE (ISRN)
Available from: 2013-07-24 Created: 2013-07-24 Last updated: 2017-11-07Bibliographically approved

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Girs, Svetlana

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