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Modelling Battery-free Communications for the Cooja Simulator
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication. (UNO)
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems. (UNO)
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication. RISE SICS, Sweden.ORCID iD: 0000-0002-2586-8573
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.

Place, publisher, year, edition, pages
2019. p. 47-58
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:uu:diva-407784ISBN: 978-0-9949886-3-8 (print)OAI: oai:DiVA.org:uu-407784DiVA, id: diva2:1417465
Conference
EWSN '19, Beijing, China, February 25-27, 2019
Available from: 2020-03-28 Created: 2020-03-28 Last updated: 2020-04-01Bibliographically approved
In thesis
1. Seamless Integration of Battery-Free Communications in Commodity Wireless Networks
Open this publication in new window or tab >>Seamless Integration of Battery-Free Communications in Commodity Wireless Networks
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ubiquitous sensing applications have countless potential benefits to society. However, batteries have long been an obstacle to their full development. Harvesting energy from the environment is a promising alternative to battery power, but traditional radio transceivers consume too much for most harvesters.  This work is motivated by backscatter communications, a technique that reduces the energy that devices spend exchanging data by up to three orders of magnitude relative to regular radios.  This reduction enables sensing devices that operate indefinitely without having to replace batteries; instead they leverage energy harvesting.  My goal is to enable the seamless integration of battery-free devices with widespread low-power commodity networks such as Bluetooth or ZigBee/IEEE 802.15.4.  Making this integration seamless is critical for the broad adoption of the new class of devices.

At a high level, my dissertation outlines a series of challenges to the seamless integration of the new devices with regular low-power networks.  We then propose ways to address these challenges, and demonstrate how we could integrate ultra-low-power battery-free devices with regular networks, while avoiding hardware modifications and minimizing any disruption that the addition may cause to existing and co-located communication devices.

This work advances the state of the art by: First, demonstrating how to augment an existing sensor network with new sensors without any hardware modification to the pre-existing hardware. The existing network provides the unmodulated carrier that the battery-free nodes need to communicate. Second, we demonstrate a radio receiver that, if implemented in silicon, can directly receive low-power commodity wireless signals when assisted by an unmodulated carrier, and with a power consumption of a few hundred microwatts. The receiver makes battery-free devices directly compatible with regular networks. We introduce simulation models and a first-of-its-kind tool to simulate battery-free communications that integrate with regular networks. Finally, we demonstrate how to efficiently provide unmodulated carrier support for battery-free devices in the previous scenarios without unnecessarily spending energy and spectrum and without undue disturbance to co-located devices.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2020. p. 65
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1928
Keywords
Backscatter communications, battery-free communications, battery-less devices, RFID, backscatter
National Category
Communication Systems Telecommunications Embedded Systems
Identifiers
urn:nbn:se:uu:diva-407787 (URN)978-91-513-0931-6 (ISBN)
Public defence
2020-05-25, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2020-04-29 Created: 2020-04-01 Last updated: 2020-05-04

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https://dl.acm.org/doi/abs/10.5555/3324320.3324327https://sites.google.com/a/ewsn.org/ewsn/file-repository/ewsn2019/047_058_perezpenichet.pdf

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Pérez-Penichet, CarlosPiumwardane, DilushiVoigt, Thiemo

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