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HyS-R: A Hybrid Subscription-Recovery Method for Downlink Connectivity in 6TiSCH Networks
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology. (CSN)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology.ORCID iD: 0000-0003-3433-2997
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Systems and Technology. (CSN)ORCID iD: 0000-0003-0873-7827
2020 (English)In: 2020 25th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA), IEEE, 2020Conference paper, Published paper (Refereed)
Abstract [en]

The Routing Protocol for Low power and lossy network (RPL) is designed to support communication requirements in 6TiSCH networks in Industrial Internet of Things (IIoT) applications. RPL is mostly optimized for uplink communication, however, less attention is given to maintain connectivity for downlink communications. Supporting downlink communications is non-trivial task in process automation and control scenarios within the IIoT. RPL in its current definition is inefficient to support reliable downlink communications in terms of scalability and memory requirements leading to significant degradation in network performance. This paper introduces HyS-R, a Hybrid Subscription-Recovery method to maintain downlink connectivity and mitigate memory limitations in large-scale 6TiSCH networks. The proposed method is based on a relief group that is used as alternative route to unreachable destinations in the network. An intermediate node subscribes to the relief group when it fails to advertise a destination to its next-hop node. In addition, members of the relief group keep searching for alternative forwarders to keep the communication traffic to a minimum. Performance evaluations are carried out and the results demonstrate that the proposed HyS-R attains significant improvements in downlink communications compared to RPL storing and non-storing modes with a margin of energy cost.

Place, publisher, year, edition, pages
IEEE, 2020.
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:miun:diva-40025DOI: 10.1109/ETFA46521.2020.9212025ISI: 000627406500258Scopus ID: 2-s2.0-85093362229ISBN: 978-1-7281-8956-7 (electronic)OAI: oai:DiVA.org:miun-40025DiVA, id: diva2:1473836
Conference
IEEE International Conference on Emerging Technologies and Factory Automation (ETFA)
Available from: 2020-10-07 Created: 2020-10-07 Last updated: 2021-11-29Bibliographically approved
In thesis
1. Enabling Industrial IoT Applications: Supporting Reliable and Real-Time Data Delivery
Open this publication in new window or tab >>Enabling Industrial IoT Applications: Supporting Reliable and Real-Time Data Delivery
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The Industrial Internet of Things (IIoT) has become a promising technology for the improvement of the productivity, efficiency, and intelligence of the manufacturing process. Industrial Wireless Sensor Networks (IWSNs) represent a main pillar of IIoT to support communications within the field network level. For several IIoT applications, IWSNs are defined by strict communication requirements in terms of latency and reliability to support the proper functioning of the industrial system and avoid production loss. However, there are many challenges in efficiently satisfying these requirements. The key challenges investigated in this thesis are related to the shortcomings of the existing IWSN standards to enable timely delivery of aperiodic critical data, support traffic differentiation, and maintain reliable end-to-end communications. The overall objective of this work is to improve the reliability and real-time communication at the field network level in IIoT applications, particularly in process automation scenarios. Specifically, the proposed solutions represent improvements within the data-link and network layers of the IWSN protocol stack. The work in this thesis introduces the following contributions. The first part of the thesis focuses on improving real-time delivery for critical traffic and enabling traffic differentiation for mixed-criticality systems. The contribution in this part comprises three approaches. The first approach introduces a deterministic priority-based channel access mechanism for emergency data in time- and mission-critical applications. The approach is based on a dynamic deadline-aware schedule to provide a delay-bounded performance for the unpredictable emergency traffic along with efficient channel utilization. In the second approach, a priority-based wireless fieldbus protocol is proposed to enable traffic differentiation in mixed-criticality systems, where each traffic flow is given a transmission priority according to its corresponding criticality level. The third approach presents an optimized retransmission scheme to maximize the probability that an emergency packet is successfully delivered within its deadline bound. The results of the proposed schemes prove their effectiveness in providing real-time delivery for critical traffic and efficient service differentiation for mixed-criticality systems. The second part of the thesis introduces a routing framework to improve the connectivity and the end-to-end communication reliability of 6TiSCH networks. The proposed solutions in this part are mainly designed on the basis of the standard Routing Protocol for Low-Power and Lossy Networks (RPL). The proposed framework comprises the following approaches: 1) a reliable mobility-aware routing scheme to support node connectivity and reliable routing in mobile 6TiSCH networks, 2) a congestion control and detection strategies to enhance packet delivery performance under imbalanced network and heavy load scenarios, 3) a hybrid multi-cast method to maintain downlink connectivity and mitigate routing memory limitations in large-scale 6TiSCH networks. The conducted performance evaluations prove the effectiveness of the proposed approaches to enhance network performance in terms of reliability and delay metrics. The proposed approaches manage to improve routing performance of 6TiSCH networks in terms of connectivity and end-to-end data delivery, which in turn improves the real-time communication in IIoT.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2020. p. 72
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 333
National Category
Communication Systems
Identifiers
urn:nbn:se:miun:diva-40027 (URN)978-91-88947-73-4 (ISBN)
Public defence
2020-11-04, C312 via Zoom, Holmgatan 10, Sundsvall, 09:00 (English)
Opponent
Supervisors
Available from: 2020-10-09 Created: 2020-10-07 Last updated: 2021-11-29Bibliographically approved

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Citation style
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