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Time slot transmission scheme with packet prioritization for Bluetooth low energy devices used in real-time applications
Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.ORCID iD: 0000-0002-8777-4863
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
Institute of Informatics, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.ORCID iD: 0000-0003-4655-8889
2020 (English)In: International Journal of Wireless Information Networks, ISSN 1068-9605, E-ISSN 1572-8129, Vol. 27, no 4, p. 518-534Article in journal (Refereed) Published
Abstract [en]

Bluetooth Low Energy (BLE) is one of the most important technologies that feed the growing field of Internet of Things and Wireless Sensor Networks. Due to its flexibility and unique low power-consumption, an increasing number of industrial devices, household appliances and wearables are being designed using it. However, the real-time demands of these networks such as timing and Quality of Service are not fully covered by the protocol itself. To help improve and offer some control over these characteristics, this paper presents a time slot transmission scheme with packet prioritization. It is based on the division and allocation of the connection interval to two types of messages: real-time and ordinary. The goal is to offer the lowest packet loss and time guarantees for real-time messages, while providing acceptable throughput for ordinary ones. Since the probability of a BLE connection to close increases with the number of packets sent through it, the position where a real-time packet is being sent as well as the number of ordinary messages in a connection represent key factors. The use of the first and last slot for real-time packets with ordinary flow restricted to the space between them decreases the transmission delay uncertainty and allows probability tuning based on the number of ordinary messages. Simulations were performed using the proposed scheme and a reduction of more than 100 times in the delay variance was observed for real-time transmissions. Regarding reliability, around 5% of the packets were lost for a bit error rate of 10−3. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

Place, publisher, year, edition, pages
New York, NY: Springer Science+Business Media B.V., 2020. Vol. 27, no 4, p. 518-534
Keywords [en]
Bluetooth low energy, Real-time communication requirements, Time slot management, Packet prioritization
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:hh:diva-43593DOI: 10.1007/s10776-020-00494-4ISI: 000572984100001Scopus ID: 2-s2.0-85091488688OAI: oai:DiVA.org:hh-43593DiVA, id: diva2:1506457
Note

Funding: This study was financed in part by the Conselho Nacional de Pesquisa-Brasil (CNPq) and by the CoordenacAo de Aperfeicoamento de Pessoal de Nivel Superior-Brasil (CAPES)-Finance Code 001.

Available from: 2020-12-03 Created: 2020-12-03 Last updated: 2020-12-03Bibliographically approved

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Jonsson, MagnusPignaton de Freitas, Edison

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