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Increased Reliability of Reduced Delay in Wireless Industrial Networks Using Relaying and Luby Codes
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. (ES)ORCID iD: 0000-0001-9589-6986
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. Halmstad University. (ES)ORCID iD: 0000-0001-6497-4099
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. (ES)ORCID iD: 0000-0002-2419-2735
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.

Place, publisher, year, edition, pages
2013. Article number 6648015- p.
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:mdh:diva-20342DOI: 10.1109/ETFA.2013.6648015Scopus ID: 2-s2.0-84890750560ISBN: 9781479908622 (print)OAI: oai:DiVA.org:mdh-20342DiVA: diva2:637996
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
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
2. Relaying for Industrial Wireless Networks
Open this publication in new window or tab >>Relaying for Industrial Wireless Networks
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2016
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 197
National Category
Other Computer and Information Science
Research subject
Computer Science
Identifiers
urn:nbn:se:mdh:diva-29859 (URN)978-91-7485-247-9 (ISBN)
Public defence
2016-02-08, Zeta, Mälardalens högskola, Västerås, 13:15 (English)
Opponent
Available from: 2015-12-08 Created: 2015-12-08 Last updated: 2016-01-07Bibliographically approved

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