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Publications (10 of 170) Show all publications
Pérez-Penichet, C., Piumwardane, D., Rohner, C. & Voigt, T. (2020). A Fast Carrier Scheduling Algorithm for Battery-free Sensor Tags in Commodity Wireless Networks. In: : . Paper presented at INFOCOM 2020, June 13-19, 2020, Las Vegas, Nevada.
Open this publication in new window or tab >>A Fast Carrier Scheduling Algorithm for Battery-free Sensor Tags in Commodity Wireless Networks
2020 (English)Conference paper, Published paper (Refereed)
Abstract [en]

New battery-free sensor tags that interoperate with unmodified standard IoT devices and protocols can extend a sensor network’s capabilities in a scalable and cost-effective manner. The tags achieve battery-free operation through backscatter-related techniques, while the standard IoT devices avoid additional dedicated infrastructure by providing the unmodulated carrier that tags need to communicate. However, this approach requires coordination between devices transmitting, receiving and generating carrier, adds extra latency and energy consumption to already constrained devices, and increases interference and contention in the shared spectrum. We present a scheduling mechanism that optimizes the use of carrier generators, minimizing any disruptions to the regular nodes. We employ timeslots to coordinate the unmodulated carrier while minimizing latency, energy consumption and overhead radio emissions. We propose an efficient scheduling algorithm that parallelizes communications with battery-free tags when possible and shares carriers among multiple tags concurrently. In our evaluation we demonstrate the feasibility and reliability of our approach in testbed experiments. We find that we can significantly reduce the excess latency and energy consumption caused by the addition of sensor tags when compared to sequential interrogation. We show that the gains tend to improve with the network size and that our solution is close to optimal on average.

National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-407786 (URN)
Conference
INFOCOM 2020, June 13-19, 2020, Las Vegas, Nevada
Available from: 2020-03-28 Created: 2020-03-28 Last updated: 2020-04-01Bibliographically approved
Asan, N. B., Hassan, E., Perez, M. D., Shah, S. R., Velander, J., Blokhuis, T. J., . . . Augustine, R. (2019). Assessment of Blood Vessel Effect on Fat-Intrabody Communication Using Numerical and Ex-Vivo Models at 2.45 GHZ. IEEE Access, 7, 89886-89900
Open this publication in new window or tab >>Assessment of Blood Vessel Effect on Fat-Intrabody Communication Using Numerical and Ex-Vivo Models at 2.45 GHZ
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2019 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 89886-89900Article in journal (Refereed) Published
Abstract [en]

The potential offered by the intra-body communication (IBC) over the past few years has resulted in a spike of interest for the topic, specifically for medical applications. Fat-IBC is subsequently a novel alternative technique that utilizes fat tissue as a communication channel. This work aimed to identify such transmission medium and its performance in varying blood-vessel systems at 2.45 GHz, particularly in the context of the IBC and medical applications. It incorporated three-dimensional (3D) electromagnetic simulations and laboratory investigations that implemented models of blood vessels of varying orientations, sizes, and positions. Such investigations were undertaken by using ex-vivo porcine tissues and three blood-vessel system configurations. These configurations represent extreme cases of real-life scenarios that sufficiently elucidated their principal influence on the transmission. The blood-vessel models consisted of ex-vivo muscle tissues and copper rods. The results showed that the blood vessels crossing the channel vertically contributed to 5.1 dB and 17.1 dB signal losses for muscle and copper rods, respectively, which is the worst-case scenario in the context of fat-channel with perturbance. In contrast, blood vessels aligned-longitudinally in the channel have less effect and yielded 4.5 dB and 4.2 dB signal losses for muscle and copper rods, respectively. Meanwhile, the blood vessels crossing the channel horizontally displayed 3.4 dB and 1.9 dB signal losses for muscle and copper rods, respectively, which were the smallest losses among the configurations. The laboratory investigations were in agreement with the simulations. Thus, this work substantiated the fat-IBC signal transmission variability in the context of varying blood vessel configurations.

Keywords
Blood vessel, channel characterization, fat-IBC, intrabody microwave communication, path loss
National Category
Medical Laboratory and Measurements Technologies
Identifiers
urn:nbn:se:uu:diva-392068 (URN)10.1109/ACCESS.2019.2926646 (DOI)000476817400018 ()
Funder
Vinnova, 2015-04159Vinnova, 2017-03568Swedish Foundation for Strategic Research , RIT17-0020EU, Horizon 2020, SINTEC-824984eSSENCE - An eScience Collaboration
Available from: 2019-09-09 Created: 2019-09-09 Last updated: 2019-11-29Bibliographically approved
Pérez-Penichet, C. & Voigt, T. (2019). Carrier Scheduling in IoT Networks with Interoperable Battery-free Backscatter Tags. In: IPSN '19: Proceedings of the 2019 International Conference on Information Processing in Sensor Networks. Paper presented at 8th ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN),ontreal, Canada, April 16-18, 2019 (pp. 329-330). Association for Computing Machinery (ACM)
Open this publication in new window or tab >>Carrier Scheduling in IoT Networks with Interoperable Battery-free Backscatter Tags
2019 (English)In: IPSN '19: Proceedings of the 2019 International Conference on Information Processing in Sensor Networks, Association for Computing Machinery (ACM), 2019, p. 329-330Conference paper, Published paper (Refereed)
Abstract [en]

New battery-free backscatter tags that integrate with unmodified standard IoT devices can extend the latter's sensing capabilities in a scalable and cost effective way. Existing IoT nodes can provide the unmodulated carrier needed by the new nodes, avoiding the need for additional infrastructure. This, however, puts extra energetic demands on constrained IoT nodes while increasing interference and contention in the network. We use a slotted MAC protocol to guarantee synchronization between transmitters, receivers and carrier generators. We then express the slot allocation problem as a Constraint Optimization Problem (COP) that parallelizes interrogations to battery-free tags when they do not collide with each other and reuses carriers for multiple tags looking to minimize the total time and the number of carrier generators needed to interrogate a set of tags. In networks with sufficient battery-free nodes we obtain a 25% reduction in the number of necessary carriers and a 50% decrease in interrogation time in most cases; leading to significant energy savings, reduced collisions and improved latency.

Place, publisher, year, edition, pages
Association for Computing Machinery (ACM), 2019
Keywords
Backscatter, Battery-free, MAC-layer, Schedule, Optimization
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-390234 (URN)10.1145/3302506.3312613 (DOI)000474338900040 ()978-1-4503-6284-9 (ISBN)
Conference
8th ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN),ontreal, Canada, April 16-18, 2019
Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2020-03-28
Ye, L., Voigt, T., Wirström, N. & Höglund, J. (2019). ECOVIBE:: On-Demand Sensing for Railway Bridge Structural Health Monitoring. IEEE Internet of Things Journal, 6(1), 1068-1078
Open this publication in new window or tab >>ECOVIBE:: On-Demand Sensing for Railway Bridge Structural Health Monitoring
2019 (English)In: IEEE Internet of Things Journal, ISSN 2327-4662, Vol. 6, no 1, p. 1068-1078Article in journal (Refereed) Published
Abstract [en]

Energy efficient sensing is one of the main objectives in the design of networked embedded monitoring systems. However, existing approaches such as duty cycling and ambient energy harvesting face challenges in railway bridge health monitoring applications due to the unpredictability of train passages and insufficient ambient energy around bridges. This paper presents ECOVIBE (Eco-friendly Vibration), an on-demand sensing system that automatically turns on itself when a train passes on the bridge and adaptively powers itself off after finishing all tasks. After that, it goes into an inactive state with near-zero power dissipation. ECOVIBE achieves these by: Firstly, a novel, fully passive event detection circuit to continuously detect passing trains without consuming any energy. Secondly, combining train-induced vibration energy harvesting with a transistor-based load switch, a tiny amount of energy is sufficient to keep ECOVIBE active for a long time. Thirdly, a passive adaptive off control circuit is introduced to quickly switch off ECOVIBE. Also this circuit does not consume any energy during inactivity periods. We present the prototype implementation of the proposed system using commercially available components and evaluate its performance in real-world scenarios. Our results show that ECOVIBE is effective in railway bridge health monitoring applications.

National Category
Computer Engineering
Identifiers
urn:nbn:se:uu:diva-366921 (URN)10.1109/JIOT.2018.2867086 (DOI)000459709500090 ()
Funder
Vinnova
Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2019-05-15Bibliographically approved
Saptarshi, H., Duquennoy, S., Wang, P., Voigt, T., Lu, C. & Cederholm, D. (2019). Handling Inherent Delays in Virtual IoT Gateways. In: : . Paper presented at DCOSS 2019, 15th International Conference on Distributed Computing in Sensor Systems, 29-31 May, 2019, Santorini, Greece.
Open this publication in new window or tab >>Handling Inherent Delays in Virtual IoT Gateways
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2019 (English)Conference paper, Published paper (Refereed)
National Category
Computer Engineering
Identifiers
urn:nbn:se:uu:diva-397809 (URN)
Conference
DCOSS 2019, 15th International Conference on Distributed Computing in Sensor Systems, 29-31 May, 2019, Santorini, Greece
Available from: 2019-11-25 Created: 2019-11-25 Last updated: 2020-05-05Bibliographically approved
Martina, B., Duquennoy, S., Tsiftes, N. & Voigt, T. (2019). IEEE 802.15. 4 TSCH in Sub-GHz:: Design Considerations and Multi-band Support. In: : . Paper presented at The 44th IEEE Conference on Local Computer Networks (LCN), 14-14 October, 2019, Osnabrück, Germany.
Open this publication in new window or tab >>IEEE 802.15. 4 TSCH in Sub-GHz:: Design Considerations and Multi-band Support
2019 (English)Conference paper, Published paper (Refereed)
National Category
Computer Engineering
Identifiers
urn:nbn:se:uu:diva-397808 (URN)
Conference
The 44th IEEE Conference on Local Computer Networks (LCN), 14-14 October, 2019, Osnabrück, Germany
Available from: 2019-11-25 Created: 2019-11-25 Last updated: 2020-05-05Bibliographically approved
Javier, S., Olofsson, S., Voigt, T. & Steinfeld, L. (2019). Improving Sensor Network Convergecast Performance with Directional Antennas. In: : . Paper presented at International Conference on Embedded Wireless Systems and Networks (EWSN 2019), 25-27 February, 2019, Beijing, China.
Open this publication in new window or tab >>Improving Sensor Network Convergecast Performance with Directional Antennas
2019 (English)Conference paper, Published paper (Refereed)
National Category
Computer Engineering
Identifiers
urn:nbn:se:uu:diva-397810 (URN)
Conference
International Conference on Embedded Wireless Systems and Networks (EWSN 2019), 25-27 February, 2019, Beijing, China
Available from: 2019-11-25 Created: 2019-11-25 Last updated: 2020-05-05Bibliographically approved
Voigt, T., Augustine, R., Asan, N. B., Perez, M. D., Ahlén, A., Teixeira, A., . . . Mani, M. (2019). LifeSec - Don’t Hack my Body. In: : . Paper presented at IEEE EuroS&P 2019 and CySeP'19.
Open this publication in new window or tab >>LifeSec - Don’t Hack my Body
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2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Computer Engineering Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-397853 (URN)
Conference
IEEE EuroS&P 2019 and CySeP'19
Available from: 2019-12-03 Created: 2019-12-03 Last updated: 2020-01-08
Mottola, L., Picco, G. P., Oppermann, F., Eriksson, J., Finne, N., Fuchs, H., . . . Voigt, T. (2019). makeSense: Simplifying the Integration of Wireless Sensor Networks into Business Processes. IEEE Transactions on Software Engineering, 45(6), 576-596
Open this publication in new window or tab >>makeSense: Simplifying the Integration of Wireless Sensor Networks into Business Processes
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2019 (English)In: IEEE Transactions on Software Engineering, ISSN 0098-5589, E-ISSN 1939-3520, Vol. 45, no 6, p. 576-596Article in journal (Refereed) Published
Abstract [en]

A wide gap exists between the state of the art in developing Wireless Sensor Network (WSN) software and current practices concerning the design, execution, and maintenance of business processes. WSN software is most often developed based on low-level OS abstractions, whereas business process development leverages high-level languages and tools. This state of affairs places WSNs at the fringe of industry. The makeSense system addresses this problem by simplifying the integration of WSNs into business processes. Developers use BPMN models extended with WSN-specific constructs to specify the application behavior across both traditional business process execution environments and the WSN itself, which is to be equipped with application-specific software. We compile these models into a high-level intermediate language—also directly usable by WSN developers—and then into OS-specific deployment-ready binaries. Key to this process is the notion of meta-abstraction, which we define to capture fundamental patterns of interaction with and within the WSN. The concrete realization of meta-abstractions is application-specific; developers tailor the system configuration by selecting concrete abstractions out of the existing codebase or by providing their own. Our evaluation of makeSense shows that i) users perceive our approach as a significant advance over the state of the art, providing evidence of the increased developer productivity when using makeSense; ii) in large-scale simulations, our prototype exhibits an acceptable system overhead and good scaling properties, demonstrating the general applicability of makeSense; and, iii) our prototype—including the complete tool-chain and underlying system support—sustains a real-world deployment where estimates by domain specialists indicate the potential for drastic reductions in the total cost of ownership compared to wired and conventional WSN-based solutions.

Place, publisher, year, edition, pages
IEEE Computer Society, 2019
National Category
Computer Engineering
Identifiers
urn:nbn:se:uu:diva-367005 (URN)10.1109/TSE.2017.2787585 (DOI)000471686800003 ()
Funder
EU, FP7, Seventh Framework Programme, FP7-ICT-2009-5 258351
Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2019-11-28Bibliographically approved
Pérez-Penichet, C., Daglaridis, G. T., Piumwardane, D. & Voigt, T. (2019). Modelling Battery-free Communications for the Cooja Simulator. In: Proceedings of the 2019 International Conference on Embedded Wireless Systems and Networks: . Paper presented at EWSN '19, Beijing, China, February 25-27, 2019 (pp. 47-58).
Open this publication in new window or tab >>Modelling Battery-free Communications for the Cooja Simulator
2019 (English)In: Proceedings of the 2019 International Conference on Embedded Wireless Systems and Networks, 2019, p. 47-58Conference paper, Published paper (Refereed)
Abstract [en]

Recent progress on backscatter communications enable devices that, assisted by an unmodulated carrier, receive and transmit standard wireless protocols such as IEEE 802.15.4 with sub-milliwatt power consumption. This paradigm, that we call carrier-assisted communications, enables batteryfree devices due to its reduced power consumption. To develop at scale, and integrate seamlessly into networks of unmodified conventional nodes, we need novel protocols at the MAC layer and above that can coordinate the carrier generators with receivers and transmitters while maintaining energy and spectral efficiency. A highly effective tool to develop such protocols is a network simulator. We introduce models for the communication range, energy consumption and other characteristics of carrier-assisted links based on parameters gathered from real-world experiments. We implement the models in Cooja, a well-known simulator, creating the first carrier-assisted communications framework to simulate interoperable battery-free devices alongside conventional sensor nodes. We illustrate how such a tool can offer valuable insights in the development and evaluation of efficient protocols for carrier-assisted communications.

National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-407784 (URN)978-0-9949886-3-8 (ISBN)
Conference
EWSN '19, Beijing, China, February 25-27, 2019
Available from: 2020-03-28 Created: 2020-03-28 Last updated: 2020-04-01Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2586-8573

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