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Scheduling for source relaying with packet aggregation in industrial wireless networks
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0001-9589-6986
University of Canterbury, UK.
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. Halmstad University.ORCID iD: 0000-0001-6497-4099
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0002-2419-2735
2016 (English)In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 12, no 5, 1855-1864 p.Article in journal (Other academic) Published
Abstract [en]

The interest in wireless communication systems for industrial applications has grown significantly over the last years. More flexible, easier to install and maintain, wireless networks present a promising alternative to the currently used wired systems. However, reliability and timeliness requirements at present met by wired networks also need to be fulfilled by wireless solutions. Packet errors introduced when packets travel through wireless channels imply a significant challenge to fulfill these requirements. Relaying has been recognized to improve the reliability in industrial wireless networks without causing additional delay. Furthermore, the recent results have shown that relaying combined with packet aggregation significantly outperforms simple relaying. However, it is not always cost efficient to introduce additional relay nodes into an industrial network and hence, in this paper, we propose using a combination of relaying and packet aggregation at the source nodes. The results show that when relaying and aggregation are used at the source nodes, the transmission schedule plays a crucial role. A schedule adapting to the varying channel conditions improves performance substantially. By carefully choosing which packet to aggregate, even further improvements can be achieved.

Place, publisher, year, edition, pages
2016. Vol. 12, no 5, 1855-1864 p.
National Category
Other Computer and Information Science
Identifiers
URN: urn:nbn:se:mdh:diva-29832DOI: 10.1109/TII.2016.2535393ISI: 000389219800022Scopus ID: 2-s2.0-85012054681OAI: oai:DiVA.org:mdh-29832DiVA: diva2:876014
Available from: 2015-12-02 Created: 2015-12-02 Last updated: 2017-02-23Bibliographically approved
In thesis
1. 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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