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Rohner, Christian
Publications (10 of 75) Show all publications
Kaveh, A., Magnani, M. & Rohner, C. (2019). Comparing node degrees in probabilistic networks. Journal of Complex Networks, 7
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. 7Article in journal (Refereed) Epub ahead of print
National Category
Computer Sciences
Identifiers
urn:nbn:se:uu:diva-392384 (URN)10.1093/comnet/cnz003 (DOI)
Available from: 2019-02-23 Created: 2019-09-03 Last updated: 2019-09-03Bibliographically 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
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
Hylamia, A., Varshney, A., Soleiman, A., Papadimitratos, P., Rohner, C. & Voigt, T. (2018). Demo: Towards Battery-free Radio Tomographic Imaging. In: WISEC'18: PROCEEDINGS OF THE 11TH ACM CONFERENCE ON SECURITY & PRIVACY IN WIRELESS AND MOBILE NETWORKS. Paper presented at 11th ACM Conference on Security and Privacy in Wireless and Mobile Networks (WiSec), JUN 18-20, 2018, Stockholm, SWEDEN (pp. 293-295). ASSOC COMPUTING MACHINERY
Open this publication in new window or tab >>Demo: Towards Battery-free Radio Tomographic Imaging
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2018 (English)In: WISEC'18: PROCEEDINGS OF THE 11TH ACM CONFERENCE ON SECURITY & PRIVACY IN WIRELESS AND MOBILE NETWORKS, ASSOC COMPUTING MACHINERY , 2018, p. 293-295Conference paper, Published paper (Refereed)
Abstract [en]

Radio Tomographic Imaging (RTI) enables novel radio frequency (RF) sensing applications such as intrusion detection systems by observing variations in radio links caused by human actions. RTI applications are, however, severely limited by the requirement to retrofit existing infrastructure with energy-expensive sensors. In this demonstration, we present our ongoing efforts to develop the first battery-free RTI system that operates on minuscule amounts of energy harvested from the ambient environment. Our system eliminates the energy-expensive components employed on state-of-the-art RTI systems achieving two orders of magnitude lower power consumption. Battery-free operation enables a sustainable deployment, as RTI sensors could be deployed for long periods of time with little maintenance effort. Our demonstration showcases an intrusion detection scenario enabled by our system.

Place, publisher, year, edition, pages
ASSOC COMPUTING MACHINERY, 2018
Keywords
radio-tomographic-imaging, battery-free, backscatter
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-377115 (URN)10.1145/3212480.3226107 (DOI)000456097500037 ()978-1-4503-5731-9 (ISBN)
Conference
11th ACM Conference on Security and Privacy in Wireless and Mobile Networks (WiSec), JUN 18-20, 2018, Stockholm, SWEDEN
Funder
Swedish Foundation for Strategic Research
Available from: 2019-02-13 Created: 2019-02-13 Last updated: 2019-02-13Bibliographically approved
Hartung, R., Käberich, J., Wolf, L. C., Feeney, L. M., Rohner, C. & Gunningberg, P. (2018). Integration of a Platform for Energy Storage Experiments into a Generic Testbed Framework. 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 (pp. 77-78). New York: ACM Press
Open this publication in new window or tab >>Integration of a Platform for Energy Storage Experiments into a Generic Testbed Framework
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2018 (English)In: Proc. 12th International Workshop on Wireless Network Testbeds, Experimental Evaluation & Characterization, New York: ACM Press, 2018, p. 77-78Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
New York: ACM Press, 2018
Keywords
MQTT, batteries, capacitor, energy, energy harvesting, framework, lifetime, lifetime estimation, low-power wireless network, software, software framework, solar, solar energy, state of charge, supercapacitors, testbed, wireless networks, wireless sensor networks
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-368659 (URN)10.1145/3267204.3268069 (DOI)
Conference
12th International Workshop on Wireless Network Testbeds, Experimental Evaluation & Characterization
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2018-12-14
Eriksson, G., Varshney, A., Rohner, C., Voigt, T. & Dancila, D. (2018). Towards Long-range Backscatter Communication with Tunnel Diode Reflection Amplifier. In: : . Paper presented at GigaHertz Symposium, Lund, May 24-25, 2018.
Open this publication in new window or tab >>Towards Long-range Backscatter Communication with Tunnel Diode Reflection Amplifier
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2018 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Communication Systems
Identifiers
urn:nbn:se:uu:diva-369185 (URN)
Conference
GigaHertz Symposium, Lund, May 24-25, 2018
Available from: 2018-12-11 Created: 2018-12-11 Last updated: 2018-12-14Bibliographically approved
Varshney, A., Perez Penichet, C., Rohner, C. & Voigt, T. (2017). Demo: LoRea: A backscatter architecture that achieves a long communication range. In: Proc. 15th ACM Conference on Embedded Network Sensor Systems: . Paper presented at SenSys 2017, November 5–8, Delft, The Netherlands. New York: ACM Press
Open this publication in new window or tab >>Demo: LoRea: A backscatter architecture that achieves a long communication range
2017 (English)In: Proc. 15th ACM Conference on Embedded Network Sensor Systems, New York: ACM Press, 2017Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

We present LoRea an architecture consisting of a backscatter tag, a reader and multiple carrier generators that overcomes the power, cost and range limitations of existing backscatter systems such as Computational Radio Frequency Identification (CRFID). LoRea achieves this by: First, generating narrow-band backscatter transmissions. Second, by mitigating self-interference without the complex designs employed on RFID readers by keeping carrier signal and backscattered signal apart in frequency. Finally, by decoupling carrier generation from the reader and using devices such as WiFi routers and sensor nodes as a source of the carrier signal. LoRea's communication range scales with the carrier strength, and proximity to the carrier source and achieves a maximum range of 3.4 km when the tag is located 1 m from the carrier source while consuming 70 mu Ws at the backscatter tag. We present various ultra-low power and long-range features of the LoRea architecture.

Place, publisher, year, edition, pages
New York: ACM Press, 2017
National Category
Computer Engineering
Identifiers
urn:nbn:se:uu:diva-335567 (URN)10.1145/3131672.3136996 (DOI)000462783500050 ()978-1-4503-5459-2 (ISBN)
Conference
SenSys 2017, November 5–8, Delft, The Netherlands
Available from: 2017-11-05 Created: 2017-12-06 Last updated: 2019-08-28Bibliographically approved
Varshney, A., Harms, O., Pérez Penichet, C., Rohner, C., Hermans, F. & Voigt, T. (2017). LoRea: A backscatter architecture that achieves a long communication range. In: Proc. 15th ACM Conference on Embedded Network Sensor Systems: . Paper presented at SenSys 2017, November 5–8, Delft, The Netherlands. New York: ACM Press
Open this publication in new window or tab >>LoRea: A backscatter architecture that achieves a long communication range
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2017 (English)In: Proc. 15th ACM Conference on Embedded Network Sensor Systems, New York: ACM Press, 2017Conference paper, Published paper (Refereed)
Abstract [en]

There is the long-standing assumption that radio communication in the range of hundreds of meters needs to consume mWs of power at the transmitting device. In this paper, we demonstrate that this is not necessarily the case for some devices equipped with backscatter radios. We present LoRea an architecture consisting of a tag, a reader and multiple carrier generators that overcomes the power, cost and range limitations of existing systems such as Computational Radio Frequency Identification (CRFID). LoRea achieves this by: First, generating narrow-band backscatter transmissions that improve receiver sensitivity. Second, mitigating self-interference without the complex designs employed on RFID readers by keeping carrier signal and backscattered signal apart in frequency. Finally, decoupling carrier generation from the reader and using devices such as WiFi routers and sensor nodes as a source of the carrier signal. An off-the-shelf implementation of LoRea costs 70 USD, a drastic reduction in price considering commercial RFID readers cost 2000 USD. LoRea's range scales with the carrier strength, and proximity to the carrier source and achieves a maximum range of 3.4 km when the tag is located at 1m distance from a 28 dBm carrier source while consuming 70 mu W at the tag. When the tag is equidistant from the carrier source and the receiver, we can communicate upto 75m, a significant improvement over existing RFID readers.

Place, publisher, year, edition, pages
New York: ACM Press, 2017
National Category
Computer Engineering
Identifiers
urn:nbn:se:uu:diva-335566 (URN)10.1145/3131672.3131691 (DOI)000462783500018 ()978-1-4503-5459-2 (ISBN)
Conference
SenSys 2017, November 5–8, Delft, The Netherlands
Available from: 2017-11-05 Created: 2017-12-06 Last updated: 2019-08-28Bibliographically approved
Feeney, L. M., Rohner, C. & Gunningberg, P. (2017). Making batteries a first class element in the design and evaluation of embedded wireless systems. In: Proc. 14th International Conference on Embedded Wireless Systems and Networks: . Paper presented at EWSN 2017, February 20–22, Uppsala, Sweden (pp. 242-243). ACM Digital Library
Open this publication in new window or tab >>Making batteries a first class element in the design and evaluation of embedded wireless systems
2017 (English)In: Proc. 14th International Conference on Embedded Wireless Systems and Networks, ACM Digital Library, 2017, p. 242-243Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
ACM Digital Library, 2017
National Category
Embedded Systems
Identifiers
urn:nbn:se:uu:diva-334647 (URN)978-0-9949886-1-4 (ISBN)
Conference
EWSN 2017, February 20–22, Uppsala, Sweden
Available from: 2017-02-20 Created: 2017-11-24 Last updated: 2017-11-26Bibliographically approved
Feeney, L. M., Hartung, R., Rohner, C., Kulau, U., Wolf, L. & Gunningberg, P. (2017). Towards realistic lifetime estimation in battery-powered IoT devices. In: Proceedings of the 15th ACM Conference on Embedded Network Sensor Systems Article No. 67: . Paper presented at 15th ACM Conference on Embedded Networked Sensor Systems (SenSys 2017), Delft, Netherlands, November 06 - 08, 2017. Association for Computing Machinery (ACM), Article ID 67.
Open this publication in new window or tab >>Towards realistic lifetime estimation in battery-powered IoT devices
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2017 (English)In: Proceedings of the 15th ACM Conference on Embedded Network Sensor Systems Article No. 67, Association for Computing Machinery (ACM), 2017, article id 67Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

We describe a testbed for studying battery discharge behavior andthe lifetime of wireless devices under controlled temperature conditions and present preliminary measurement results.

Place, publisher, year, edition, pages
Association for Computing Machinery (ACM), 2017
National Category
Embedded Systems
Identifiers
urn:nbn:se:uu:diva-337125 (URN)10.1145/3131672.3136985 (DOI)000462783500067 ()
Conference
15th ACM Conference on Embedded Networked Sensor Systems (SenSys 2017), Delft, Netherlands, November 06 - 08, 2017
Available from: 2017-12-20 Created: 2017-12-20 Last updated: 2019-08-22Bibliographically approved
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