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Relaying for Timely and Reliable Message Dissemination in Wireless Distributed Control Systems
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Centre for Research on Embedded Systems (CERES).
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: urn:nbn:se:hh:diva-28245Libris ID: 18245220ISBN: 978-91-87045-31-8 ISBN: 978-91-87045-30-1 OAI: oai:DiVA.org:hh-28245DiVA: diva2:811299
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: 2017-10-31Bibliographically approved
List of papers
1. A Framework for Reliable Exchange of Periodic and Event-Driven Messages in Platoons
Open this publication in new window or tab >>A Framework for Reliable Exchange of Periodic and Event-Driven Messages in Platoons
2015 (English)In: 2015 IEEE International Conference on Communication Workshop, Piscataway: IEEE conference proceedings, 2015, 2471-2476 p.Conference paper, Published paper (Refereed)
Abstract [en]

Platooning is widely considered a promising approach to decrease fuel consumption by reducing the air drag. However, in order to achieve the benefits of aerodynamic efficiency, the inter-vehicle distances must be kept short. This implies that the intra-platoon communication must not only be reliable but also able to meet strict timing deadlines. In this paper, we propose a framework that reliably handles the co-existence of both time-triggered and event-driven control messages in platooning applications and we derive an efficient message dissemination technique. We propose a semi-centralized time division multiple access (TDMA) approach, which e.g., can be placed on top of the current standard IEEE 802.11p and we evaluate the resulting error probability and delay, when using it to broadcast periodic beacons and disseminating eventdriven messages within a platoon. Simulation results indicate that the proposed dissemination policy significantly enhances the reliability for a given number of available time-slots, or alternatively, reduces the delay, in terms of time-slots, required to achieve a certain target error probability, without degrading the performance of co-existing time-triggered messages. © 2015 IEEE

Place, publisher, year, edition, pages
Piscataway: IEEE conference proceedings, 2015
Series
IEEE International Conference on Communication Workshop, ISSN 2164-7038 ; 2015
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:hh:diva-28231 (URN)10.1109/ICCW.2015.7247547 (DOI)000380459900401 ()2-s2.0-84947775613 (Scopus ID)978-1-4673-6305-1 (ISBN)
Conference
EEE International Conference on Communication Workshop, ICCW 2015, London, United Kingdom, 8 – 12 June, 2015
Projects
ACDC
Funder
Knowledge Foundation
Available from: 2015-05-08 Created: 2015-05-08 Last updated: 2017-10-31Bibliographically approved
2. An Efficient Message Dissemination Technique in Platooning Applications
Open this publication in new window or tab >>An Efficient Message Dissemination Technique in Platooning Applications
2015 (English)In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 19, no 6, 1017-1020 p.Article in journal (Refereed) Published
Abstract [en]

Autonomous driving in road trains, a.k.a. platooning, may reduce fuel consumption considerably if the intervehicle distances are kept short. However, to do this, the intraplatoon communication must not only be reliable but also able to meet strict deadlines. While time-triggered messages are the foundation of most distributed control applications, platooning is likely to also require dissemination of event-driven messages. While much research work has focused on minimizing the age of periodic messages, state-of-the-art for disseminating eventdriven messages is to let all nodes repeat all messages and focus on mitigating broadcast storms. We derive an efficient message dissemination scheme based on relay selection which minimizes the probability of error at the intended receiver(s) for both unicast and broadcast, without degrading the performance of co-existing time-triggered messages. We present a full analysis of the resulting error probability and delay, when relayers, selected by our algorithm, are used to disseminate messages within a platoon. Numerical results indicate that the proposed relaying policy significantly enhances the reliability for a given delay.

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Press, 2015
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:hh:diva-28228 (URN)10.1109/LCOMM.2015.2416174 (DOI)000356164000032 ()2-s2.0-84933507762 (Scopus ID)
Projects
ACDC
Funder
Knowledge Foundation
Available from: 2015-05-08 Created: 2015-05-08 Last updated: 2017-12-04Bibliographically approved
3. A Simple Relaying Scheme to Guarantee Timeliness and Reliability in Wireless Networks
Open this publication in new window or tab >>A Simple Relaying Scheme to Guarantee Timeliness and Reliability in Wireless Networks
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.

National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:hh:diva-28243 (URN)
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

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