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A Simple Relaying Scheme to Guarantee Timeliness and Reliability in Wireless Networks
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES). Mälardalen University, Västerås, Sweden.ORCID iD: 0000-0001-6497-4099
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).ORCID iD: 0000-0002-6526-3931
2015 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Many emerging applications based on wireless networks involves distributed control. This implies high requirements on reliability, but also on maximum delay and sometimes jitter. The total delay depends on the packet error rate and the time until channel access is granted. With e.g., TDMA, channel access is upper-bounded and the jitter zero. To reduce the packet error rate given a certain deadline (a set of TDMA time-slots), we propose a simple relaying scheme, including a full analysis of its resulting error probability and delay. Numerical results show that the proposed relaying strategy significantly improves reliability given a certain message deadline.

Place, publisher, year, edition, pages
2015.
National Category
Communication Systems Telecommunications
Identifiers
URN: urn:nbn:se:hh:diva-28243OAI: oai:DiVA.org:hh-28243DiVA: diva2:811219
Projects
ACDC
Funder
Knowledge FoundationeLLIIT - The Linköping‐Lund Initiative on IT and Mobile Communications
Available from: 2015-05-11 Created: 2015-05-11 Last updated: 2016-07-07Bibliographically approved
In thesis
1. Relaying for Timely and Reliable Message Dissemination in Wireless Distributed Control Systems
Open this publication in new window or tab >>Relaying for Timely and Reliable Message Dissemination in Wireless Distributed Control Systems
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Distributed control applications enabled by wireless networks are becoming more and more frequent. The advantages of wireless access are many, as control systems become mobile, autonomous and connected. Examples include platooning and automated factories. However, distributed control systems have stringent requirement on both reliability and timeliness, the latter in terms of deadlines. If the deadline is missed, the packet is considered useless, similarly to a lost or erroneous packet in a system without deadlines. In addition, wireless channels are, by nature, more exposed to noise and interference than their wired counterparts. Consequently, it implies a considerable challenge to fulfill the deadline requirements with sufficient reliability for proper functionality of distributed control applications. However, by taking advantage of cooperative communications, increased reliability can be achieved with little or no additional delay.

Reducing the delay until a message is successfully received is a two-fold problem: providing channel access with a predictable maximum delay and maximizing the reliability of each transmission, once granted by the medium access method. To this end, this thesis proposes a framework that provides a bounded channel access delay and handles the co-existence of both time-triggered and event-driven messages encountered in distributed control applications. In addition, the thesis proposes and evaluates an efficient message dissemination technique based on relaying that maximizes the reliability given a certain deadline, or alternatively determines the delay required to achieve a certain reliability threshold for both unicast and broadcast scenarios. Numerical results, which are verified by Monte-Carlo simulations, show significant improvements with the proposed relaying scheme as compared to a conventional scheme without cooperation, providing more reliable message delivery given a fixed number of available time-slots. It also becomes clear in which situations relaying is preferable and in which situations pure retransmissions are preferable, as the relay selection algorithm will always pick the best option. The relay selection algorithm has a reasonable complexity and can be used by both routing algorithms and relaying scenarios in any time-critical application as long as it is used together with a framework that enables predictable channel access. In addition, it can be implemented on top of commercially available transceivers.

Place, publisher, year, edition, pages
Halmstad: Halmstad University Press, 2015. 58 p.
Series
Halmstad University Dissertations, 14
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:hh:diva-28245 (URN)978-91-87045-31-8 (ISBN)978-91-87045-30-1 (ISBN)
Presentation
2015-06-01, Haldasalen, Visionen, Högskolan i Halmstad, Kristian IV:s väg 3, Halmstad, 13:15 (English)
Opponent
Supervisors
Projects
ACDC
Funder
Knowledge FoundationeLLIIT - The Linköping‐Lund Initiative on IT and Mobile Communications
Available from: 2015-05-12 Created: 2015-05-11 Last updated: 2017-10-13Bibliographically approved

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CiteExportLink to record
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Citation style
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