mdh.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Relaying for Industrial Wireless Networks
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.ORCID iD: 0000-0001-9589-6986
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: urn:nbn:se:mdh:diva-29859ISBN: 978-91-7485-247-9 (print)OAI: oai:DiVA.org:mdh-29859DiVA: diva2:878073
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
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, 183-190 p.Conference 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 Wireless Networks Using Relaying and Packet Aggregation
Open this publication in new window or tab >>On the Role of Feedback for Industrial Wireless Networks Using Relaying and Packet Aggregation
2014 (English)In: 2014 IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY (ICIT), 2014, 743-748 p.Conference paper, Published paper (Refereed)
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.

National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-28507 (URN)10.1109/ICIT.2014.6895024 (DOI)000355275500130 ()2-s2.0-84907789881 (Scopus ID)978-1-4799-3939-8 (ISBN)
Conference
IEEE International Conference on Industrial Technology (ICIT), FEB 26-MAR 01, 2014, Busan, SOUTH KOREA
Available from: 2015-06-25 Created: 2015-06-25 Last updated: 2016-06-01Bibliographically approved
4. Adopting FEC and Packet Combining to Increase the Performance of IWSNs Using Relaying
Open this publication in new window or tab >>Adopting FEC and Packet Combining to Increase the Performance of IWSNs Using Relaying
2016 (English)In: International Conference on Computing and Network Communications CoCoNet'15, 2016, 90-97 p.Conference paper, Published paper (Refereed)
Abstract [en]

Industrial networks can benefit significantly from introduction of wireless communication. However, wireless systems suffer from much higher packet error rates than wired networks do, making it difficult to obtain sufficient reliability within application deadlines. One promising approach to increase the reliability of wireless communication systems without causing excessive additional delays is to exploit spatial diversity. However, often in industrial networks it is not possible to place the relay nodes optimally. Due to this not even relay nodes located close to the source are able to receive the source packets missing at the destination correctly and consequently they cannot assist by relaying. Therefore, to benefit even further from relaying, additional measures should be taken both to increase the number of the correct packets at the relay nodes and to allow the destination to recover more correct packets. Consequently, the focus of this work is schemes enabling relaying, forward-error-correction (FEC) and packet combining without causing additional delays or complexity such that it is possible to use off the shelf transceivers. The results show that the introduction of FEC and packet combining does improve performance by enabling relay nodes to help more often. However, the exact gain depends on the specific FEC scheme used and, in particular, the size of the preamble and other fields that must be left uncoded, but still be received correctly, to be able to use FEC on the received packet.

National Category
Computer Engineering
Identifiers
urn:nbn:se:mdh:diva-29652 (URN)10.1109/CoCoNet.2015.7411172 (DOI)000376085000013 ()2-s2.0-84964902861 (Scopus ID)978-146737309-8 (ISBN)
Conference
International Conference on Computing and Network Communications, CoCoNet 2015; Trivandrum; India; 15 December 2015 through 19 December 2015
Projects
READY - Research Environment for Advancing Low Latency InternetWIRE – Wireless Industrial networks with Reliability Enhancements
Available from: 2015-12-03 Created: 2015-11-26 Last updated: 2016-06-09Bibliographically approved
5. Scheduling for source relaying with packet aggregation in industrial wireless networks
Open this publication in new window or tab >>Scheduling for source relaying with packet aggregation in industrial wireless networks
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.

National Category
Other Computer and Information Science
Identifiers
urn:nbn:se:mdh:diva-29832 (URN)10.1109/TII.2016.2535393 (DOI)000389219800022 ()2-s2.0-85012054681 (Scopus ID)
Available from: 2015-12-02 Created: 2015-12-02 Last updated: 2017-12-01Bibliographically approved
6. Probabilistic Scheduling and Adaptive Relaying for WirelessHART Networks
Open this publication in new window or tab >>Probabilistic Scheduling and Adaptive Relaying for WirelessHART Networks
Show others...
2015 (English)In: 20th IEEE International Conference on Emerging Technologies and Factory Automation ETFA'15, 2015Conference paper, Published paper (Refereed)
Abstract [en]

This paper deals with a way to probabilistically guarantee reliable packet delivery in WirelessHART based networks suitable for industrial control systems. We propose a new scheduling scheme, called Iterative Probabilistic Scheduling with Adaptive Relaying (IPS-AR), which consists of a static part (IPS) and a dynamic part (AR). IPS takes into account the channel characteristics and exploits relaying to achieve a minimum reliability threshold as requested by the supported industrial application. In the AR part, each relay node decides the packet to be sent based on online assessment of both the number of consecutive errors experienced by previous packets belonging to the same flow, as well as the number of copies of the packet currently available at the other relay nodes. This enables IPS-AR to achieve the desired reliability level while using the available re-sources in terms of time and bandwidth more efficiently.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-29651 (URN)10.1109/ETFA.2015.7301600 (DOI)000378564800201 ()2-s2.0-84952936854 (Scopus ID)9781467379304 (ISBN)
Conference
20th IEEE International Conference on Emerging Technologies and Factory Automation ETFA'15, 8-11 Sep 2015, Luxemburg, Luxemburg
Projects
READY - Research Environment for Advancing Low Latency InternetWIRE – Wireless Industrial networks with Reliability Enhancements
Available from: 2015-12-03 Created: 2015-11-26 Last updated: 2016-07-28Bibliographically approved

Open Access in DiVA

No full text

Authority records BETA

Girs, Svetlana

Search in DiVA

By author/editor
Girs, Svetlana
By organisation
Embedded Systems
Other Computer and Information Science

Search outside of DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 831 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf