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Rohner, Christian
Publications (10 of 83) 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
Corneo, L., Rohner, C. & Gunningberg, P. (2019). Age of Information-Aware Scheduling for Timely and Scalable Internet of Things Applications. In: IEEE Conference On Computer Communications (IEEE INFOCOM 2019): . Paper presented at IEEE Conference on Computer Communications (IEEE INFOCOM), APR 29-MAY 02, 2019, Paris, FRANCE (pp. 2476-2484).
Open this publication in new window or tab >>Age of Information-Aware Scheduling for Timely and Scalable Internet of Things Applications
2019 (English)In: IEEE Conference On Computer Communications (IEEE INFOCOM 2019), 2019, p. 2476-2484Conference paper, Published paper (Refereed)
Abstract [en]

We consider large scale Internet of Things applications requesting data from physical devices. We study the problem of timely dissemination of sensor data towards applications with freshness requirements by means of a cache. We aim to minimize direct access to the possibly battery powered physical devices, yet improving Age of Information as a data freshness metric. We propose an Age of Information-aware scheduling policy for the physical device to push sensor updates to the caches located in cloud data centers. Such policy groups application requests based on freshness thresholds, thereby reduces the number of requests and threshold misses, and accounts for delay variation. The policy is incrementally introduced as we study its behavior over ideal and more realistic communication links with delay variation. We numerically evaluate the proposed policy against a simple yet widely used periodic schedule. We show that our informed schedule outperforms the periodic schedule even under high delay variations.

Series
IEEE INFOCOM, ISSN 0743-166X
National Category
Communication Systems Computer Sciences
Identifiers
urn:nbn:se:uu:diva-393764 (URN)000480426400276 ()978-1-7281-0515-4 (ISBN)
Conference
IEEE Conference on Computer Communications (IEEE INFOCOM), APR 29-MAY 02, 2019, Paris, FRANCE
Funder
Swedish Foundation for Strategic Research , GMT14-0032
Available from: 2019-09-27 Created: 2019-09-27 Last updated: 2019-12-02
Kaveh, A., Magnani, M. & Rohner, C. (2019). Comparing node degrees in probabilistic networks. Journal of Complex Networks, 7(5), 749-763
Open this publication in new window or tab >>Comparing node degrees in probabilistic networks
2019 (English)In: Journal of Complex Networks, E-ISSN 2051-1329, Vol. 7, no 5, p. 749-763Article in journal (Refereed) Published
National Category
Computer Sciences
Identifiers
urn:nbn:se:uu:diva-392384 (URN)10.1093/comnet/cnz003 (DOI)000490703200005 ()
Available from: 2019-02-23 Created: 2019-09-03 Last updated: 2019-11-14Bibliographically approved
Kaveh, A., Magnani, M. & Rohner, C. (2019). Defining and measuring probabilistic ego networks. Applied Network Science Journal
Open this publication in new window or tab >>Defining and measuring probabilistic ego networks
2019 (English)In: Applied Network Science Journal, E-ISSN 2364-8228Article in journal (Other academic) Submitted
National Category
Computer Sciences
Identifiers
urn:nbn:se:uu:diva-392404 (URN)
Available from: 2019-06-16 Created: 2019-09-03 Last updated: 2019-09-03Bibliographically 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
Jacobsson, M. & Rohner, C. (2019). Link quality estimation for arbitrary packet sizes over wireless links using packet reception events. International Journal of Communication Systems, 32(16), Article ID e4115.
Open this publication in new window or tab >>Link quality estimation for arbitrary packet sizes over wireless links using packet reception events
2019 (English)In: International Journal of Communication Systems, ISSN 1074-5351, E-ISSN 1099-1131, Vol. 32, no 16, article id e4115Article in journal (Refereed) Published
Abstract [en]

The packet error rate of wireless links is known to increase with the length of packets. Yet, packet length is rarely taken into account in protocols and algorithms estimating the packet error rate. Still, it is an important factor that higher layer protocols need to be aware of. In this article, we systematically measure the relationship between packet length and packet error rate over a wide range of wireless links and technologies. On the basis of our measurements, we propose a simple empirical model that can capture this behavior. Using this model, multiple methods are proposed that can estimate the packet error rate for any packet length by sampling the link. We consider methods based on hello packets with controlled packet lengths as well as data packets, where the transmitted packet lengths cannot be controlled. We investigate the accuracy of the different estimation methods in various situations and show how they are able to predict the delivery ratio for different packet sizes.

Keywords
bit error rate, hello protocol, link quality estimation, packet error rate
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-398819 (URN)10.1002/dac.4115 (DOI)000478835300001 ()
Funder
Vinnova, 2015-02536
Available from: 2019-12-13 Created: 2019-12-13 Last updated: 2019-12-13Bibliographically approved
Hylamia, S., Rohner, C. & Voigt, T. (2019). Poster: Tiek: Two-tier Authentication and Key Distribution for Wearable Devices. In: : . Paper presented at IEEE European Symposium on Security and Privacy, Stockholm, June 17-19, 2019..
Open this publication in new window or tab >>Poster: Tiek: Two-tier Authentication and Key Distribution for Wearable Devices
2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-397880 (URN)
Conference
IEEE European Symposium on Security and Privacy, Stockholm, June 17-19, 2019.
Funder
Swedish Foundation for Strategic Research
Available from: 2019-11-27 Created: 2019-11-27 Last updated: 2019-11-29Bibliographically approved
Hylamia, S., Yan, W., Rohner, C. & Voigt, T. (2019). Tiek: Two-tier Authentication and Key Distribution for Wearable Devices. In: 15th International Conference on Wireless and MObile Computing, Networking and Communication (WiMob), Barcelona, 21-23 October, 2019.: . Paper presented at 15th International Conference on Wireless and MObile Computing, Networking and Communication (WiMob), Barcelona, 21-23 October, 2019..
Open this publication in new window or tab >>Tiek: Two-tier Authentication and Key Distribution for Wearable Devices
2019 (English)In: 15th International Conference on Wireless and MObile Computing, Networking and Communication (WiMob), Barcelona, 21-23 October, 2019., 2019Conference paper, Published paper (Refereed)
Abstract [en]

Wearable devices, such as implantable medical devices and smart wearables, are becoming increasingly popular with applications that vary from casual activity monitoring to critical medical uses. Unsurprisingly, numerous security vulnerabilities have been found in this class of devices. Yet, research on physical measurement-based authentication and key distribution assumes that body-worn devices are benign and uncompromised. Tiek is a novel authentication and key distribution protocol which addresses this issue. We utilize two sources of randomness to perform device authentication and key distribution simultaneously but through separate means. This creates a two-tier authorization scheme that enables devices to join the network while protecting them from each other. We describe Tiek and analyze its security.

National Category
Communication Systems
Research subject
Computer Science with specialization in Computer Communication
Identifiers
urn:nbn:se:uu:diva-397775 (URN)
Conference
15th International Conference on Wireless and MObile Computing, Networking and Communication (WiMob), Barcelona, 21-23 October, 2019.
Funder
Swedish Foundation for Strategic Research
Available from: 2019-11-25 Created: 2019-11-25 Last updated: 2019-11-29Bibliographically approved
Voigt, T., Augustine, R., Asan, N. B., Perez, M. D., Ahlén, A., Teixeira, A., . . . Mani, M. (2019). Tumor Sensing Privacy in In-Body Networks. In: : . Paper presented at EEE EuroS&P 2019 and CySeP'19.
Open this publication in new window or tab >>Tumor Sensing Privacy in In-Body Networks
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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-398222 (URN)
Conference
EEE EuroS&P 2019 and CySeP'19
Available from: 2019-12-03 Created: 2019-12-03 Last updated: 2020-01-08
Hartung, R., Käberich, J., Wolf, L. C., Feeney, L. M., Rohner, C. & Gunningberg, P. (2018). A Platform for Experiments with Energy Storage Devices for Low-power Wireless Networks. In: Proc. 12th International Workshop on Wireless Network Testbeds, Experimental Evaluation & Characterization: . Paper presented at 12th International Workshop on Wireless Network Testbeds, Experimental Evaluation & Characterization, New Delhi, India — November 02 - 02, 2018 (pp. 68-76). New York: ACM Press
Open this publication in new window or tab >>A Platform for Experiments with Energy Storage Devices for Low-power Wireless Networks
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2018 (English)In: Proc. 12th International Workshop on Wireless Network Testbeds, Experimental Evaluation & Characterization, New York: ACM Press, 2018, p. 68-76Conference paper, Published paper (Refereed)
Abstract [en]

We present a hardware platform for performing experimental studies of energy storage devices for low power wireless networks. It is based on a low-cost custom card that can apply fine-grain synthetic loads ? both charge and discharge ? to a set of batteries or capacitors and measure their response in detail. Loads can be defined from a "live" trace of a running wireless device, from a recorded trace, or programmatically via a script. This approach makes it practical to run well controlled, large scale, long running experiments and to obtain high precision and accuracy. We describe two proof-of-concept experiments using rechargeable Li coin cells and capacitors to demonstrate the capabilities of our platform.

Place, publisher, year, edition, pages
New York: ACM Press, 2018
Keywords
battery lifetime, battery modelling, energy harvesting, energy storage, energy supply, experiment, internet of things, lifetime estimation, low-power wireless networks, modelling, platform, real-world experiments, simulation, state of charge, state of charge estimation, super capacitors, testbed, wireless sensor networks
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-368658 (URN)10.1145/3267204.3267208 (DOI)
Conference
12th International Workshop on Wireless Network Testbeds, Experimental Evaluation & Characterization, New Delhi, India — November 02 - 02, 2018
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2019-03-06Bibliographically approved
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