Thomas Watteyne

Thomas Watteyne
National Institute for Research in Computer Science and Control | INRIA · EVA team

PhD

About

194
Publications
89,621
Reads
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7,443
Citations
Introduction
Thomas Watteyne (http://eecs.berkeley.edu/~watteyne/) is an insatiable enthusiast of low-power wireless mesh technologies. He designs, models and builds networking solutions based on a variety of Internet-of-Things (IoT) standards. He contributes to the field through academic, commercial and standardization worlds.
Additional affiliations
January 2015 - present
Inria
Position
  • Research Scientist & Innovator
December 2011 - present
Linear Technology
Position
  • Senior Networking Design Engineer
December 2010 - December 2011
Dust Networks
Position
  • Senior Networking Design Engineer
Education
February 2009 - December 2010
University of California, Berkeley
Field of study
  • Berkeley Sensor & Actuator Center (BSAC)
April 2008 - August 2008
University of California, Berkeley
Field of study
  • Visiting Researcher
May 2007 - May 2007
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Field of study

Publications

Publications (194)
Article
Full-text available
In this article we deal with the issue of network traffic monitoring in large multi-channel wireless IoT networks. Assuming known link conditions on all radio channels, i.e. connectivity matrix defined through Packet Delivery Ratio on all frequencies and all links between nodes, we propose two methods for defining the number and the positions of sn...
Article
Full-text available
In this article, we propose a routing mechanism based on the RPL protocol in a wireless network that is equipped with a mix of short‐range and long‐range radios. We introduce Life‐OF, an objective function for RPL which uses a combination of metrics and the diverse physical layers to boost the network's lifetime. We evaluate the performance of Life...
Conference Paper
Full-text available
This research proposes a co-design framework for scheduling, routing and gateway designation to improve the real-time performance of low-power wireless mesh networks. We target time-synchronized channel hopping (TSCH) networks with centralized network management and a single gateway. The end goal is to exploit existing trade-offs between the three...
Article
Full-text available
Indoor localization techniques have been extensively studied in the last decade. The well-established technologies enable the development of Real-Time Location Systems (RTLS). A good body of publications emerged, with several survey papers that provide a deep analysis of the research advances. Existing survey papers focus on either a specific techn...
Article
Full-text available
The single chip micro-mote (SCµM) is a 2×3 mm 2 single-chip crystal-free mote-on-chip. SCµM implements the IEEE802.15.4 and BLE standards and can communicate with off-the-shelf radios compliant to those standards. SCµM exclusively uses on-chip oscillators, including a 2.4 GHz LC oscillator to synthesize the communication frequency, and a 2 MHz RC o...
Article
Full-text available
Wireless networks traditionally use a single physical layer for communication: some use high bit-rate short-range radios, others low bit-rate long-range radios. This article introduces g6TiSCH, a generalization of the standards-based IETF 6TiSCH protocol stack. g6TiSCH allows nodes equipped with multiple radios to dynamically switch between them on...
Article
Existing methods for wireless sensor network (WSN) topology optimization employ simplifying assumptions of a fixed communication radius between network nodes, which is ill-suited for IoT networks deployed in complex terrain. This article proposes a data-driven approach to WSN topology optimization, employing a Bayesian link classifier trained on LI...
Article
Full-text available
This paper presents a thorough comparison of the Transport Layer Security (TLS) v1.2 and Datagram TLS (DTLS) v1.2 handshake in 6TiSCH networks. TLS and DTLS play a crucial role in protecting daily Internet traffic, while 6TiSCH is a major low-power link layer technology for the IoT. In recent years, DTLS has been the de-facto security protocol to p...
Article
Full-text available
Long-range frequency hopping spread spectrum (LR-FHSS) is the new physical layer designed to address extremely long-range and large-scale communication scenarios, such as satellite IoT. At its core is a fast frequency hopping technique designed to offer higher network capacity while offering the same radio link budget as LoRa. Additionally, LR-FHSS...
Article
Full-text available
New radio chips implement different physical layers, allowing firmware to change modulation, datarate and frequency dynamically. This technological development is an opportunity for industrial low-power wireless networks to offer even higher determinism, including latency predictability. This article introduces 6DYN, an extension to the IETF 6TiSCH...
Preprint
Full-text available
LoRa-E is a new physical layer developed by Semtech to increase the capacity of LoRaWAN in dense and congested deployments. It has also been designed to address extremely long-range and large-scale communication scenarios with a focus on reaching gateway devices installed on satellites. Thanks to its design principles, it finely manages packet tran...
Article
Full-text available
Low-power wireless applications require different trade-off points between latency, reliability, data rate and power consumption. Given such a set of constraints, which physical layer should I be using? We study this question in the context of 6TiSCH, a state-of-the-art recently standardized protocol stack developed for harsh industrial application...
Article
The Single Chip Micro Mote (SCμM) is a crystal-free single-chip mote that brings us one step closer to the Smart Dust vision, in particular as it can communicate with off-the-shelf IEEE802.15.4 and Bluetooth Low Energy devices. However, before it can be part of such networks, the crystal-free SCμM chip needs to be able to accurately tune its commun...
Article
We present a system for centimeter-precision 3 dimensional localization of a 2 x 3 x 0.3 mm³,, 5 mg, wireless system-on-chip by utilizing a temporally-structured infrared illumination scheme generated by a set of base stations. This 3D localization system builds on previous work by adding a second lighthouse station to enable 3D localization and us...
Conference Paper
Full-text available
Los productores de viñedos han estado reuniendo información operacional significativa sobre sus campos, y las fincas más avanzadas pueden producir varios años de datos sobre cómo se ha plantado, regado, fertilizado y cómo han madurado las uvas. A pesar de esta riqueza de datos operacionales, hoy en día no existe ninguna herramienta que pueda comple...
Article
Full-text available
6TiSCH is a standardization group within the Internet Engineering Task Force (IETF) that works on IPv6‐enabled Time‐slotted Channel Hopping (TSCH) networks. The 6TiSCH protocol stack, designed by the standardizationwork at the IETF, has direct applicability to low‐power Internet of Things (IoT) use cases, including smart factory, building, infrastr...
Article
Full-text available
Tens of thousands of wireless industrial monitoring deployments exist today, logging more than 18 billion operating hours. These solutions have been around for over a decade and are based on standards such as WirelessHART and ISA100.11a to provide performance guarantees to the applications. The new trend in industry deployments is the convergence o...
Article
Simulation is a powerful tool for development of wireless networks. One key drawback of simulation‐based studies for wireless networking is the need to use a radio propagation model. In this paper, we propose trace‐based simulation for 6TiSCH (IPv6 over the TSCH mode of IEEE802.15.4e). We make the 6TiSCH Simulator run against connectivity traces co...
Article
Full-text available
We report the first time-synchronized protocol stack running on a crystal-free device. We use an early prototype of the Single-Chip micro Mote, SCµM, a single-chip 2×3 mm 2 mote-on-a-chip, which features an ARM Cortex-M0 micro-controller and an IEEE802.15.4 radio. This prototype consists of an FPGA version of the micro-controller, connected to the...
Conference Paper
Full-text available
We report the first time-synchronized protocol stack running on a crystal-free device. We use an early prototype of the Single-Chip micro Mote, SCµM, a single-chip 2×3 mm 2 mote-on-a-chip, which features an ARM Cortex-M0 micro-controller and an IEEE802.15.4 radio. This prototype consists of a FPGA version of the micro-controller, connected to the S...
Conference Paper
Full-text available
This demo presents a room-level localization solution built on top of the market leading SmartMesh IP industrial low-power wireless mesh network. Without any changes to the hardware or protocol stack of that product, we re-purpose Blink-a feature designed to allow for mobile nodes-for localization. We demonstrate how we can deploy the resulting loc...
Article
Full-text available
In this paper we experimentally evaluate and compare the robustness against interference of the OQPSK-DSSS (Offset Quadrature Phase Shift Keying - Direct Sequence Spread Spectrum) and the SUN-OFDM (Smart Utility Network - Orthogonal Frequency Division Multiplexing) physical layers, as defined in the IEEE 802.15.4-2015 standard. The objective of thi...
Article
The IETF IPv6 over the TSCH mode of IEEE802.15.4e (6TiSCH) working group has standardized a set of protocols to enable low power industrial-grade IPv6 networks. 6TiSCH proposes a protocol stack rooted in the Time Slotted Channel Hopping (TSCH) mode of the IEEE802.15.4-2015 standard, supports multi-hop topologies with the IPv6 Routing Protocol for L...
Article
Full-text available
The single chip integration of a wireless sensor node would allow for cheap, low-power, dust-size devices. The key to realizing this vision is to eliminate bulky off-chip frequency references such as crystal oscillators or resonators, and their associated power-hungry circuitry. The immediate challenge of removing off-chip references is that there...
Article
The convergence of operational and information technologies in the industry requires a new generation of IP-compliant communication protocols that can meet the industrial performance requirements while facilitating the integration with novel web-based supervisory control and data acquisition (SCADA) systems. For more than a decade, the industry has...
Preprint
In this paper, we experimentally evaluate and compare the robustness against interference of the OQPSK-DSSS (Offset Quadrature Phase Shift Keying - Direct Sequence Spread Spectrum) and the SUN-OFDM (Smart Utility Network - Orthogonal Frequency Division Multiplexing) physical layers, as defined in the IEEE 802.15.4-2015 standard. The objective of th...
Preprint
The elimination of the off-chip frequency reference, typically a crystal oscillator, would bring important benefits in terms of size, price and energy efficiency to IEEE802.15.4 compliant radios and systems-on-chip. The stability of on-chip oscillators is orders of magnitude worse than that of a crystal. It is known that as the temperature changes,...
Conference Paper
Experimentation on testbeds with Internet of Things (IoT) devices is hard. The tedious firmware development, the lack of user interfaces, the stochastic nature of the radio channel, the testbed learning curve, are some of the factors that make the evaluation process error prone. The impact of such errors on published results can be quite unfortunat...
Article
Full-text available
6TiSCH is a working group at the IETF, which is standardizing how to combine IEEE802.15.4 time‐slotted channel hopping (TSCH) with IPv6. The result is a solution that offers both industrial performance and seamless integration into the Internet and is therefore seen as a key technology for the Industrial Internet of Things. This article presents th...
Article
Low-power wireless technologies have been applied to industrial fields not only to monitor facilities but also to control them. There is a legitimate requirement to integrate low-power wireless networks with existing IP-enabled networks such as the Internet. The 6LoWPAN standard makes this happen easily by enabling low-power wireless networks to tr...
Article
How realistic is the connectivity in a testbed? We answer this question by gathering connectivity measurements from 11 datasets, on both testbeds and real-world deployments. We propose a 5-point checklist to assess the realism of a testbed deployment and introduce a visual tool to evaluate the connectivity characteristics of a deployment.
Article
Full-text available
IEEE802.15.4g is a low-power wireless standard initially designed for Smart Utility Networks, i.e., for connecting smart meters. IEEE802.15.4g operates at sub-GHz frequencies to offer 2–3× longer communication range compared to its 2.4 GHz counterpart. Although the standard offers 3 PHYs (Frequncy Shift Keying, Orthogonal Frequency Division Multipl...
Article
Constructive Interference (CI) can happen when multiple wireless devices send the same frame at the same time. If the time offset between the transmissions is less than 500 ns, a receiver will successfully decode the frame with high probability. CI can be useful for achieving low-latency communication or low-overhead flooding in a multi-hop low-pow...
Chapter
F-Interop allows implementors of IoT protocols to test compliance and interoperability of their implementation by connecting to a remote server in the cloud which contains and runs testing tools for different IoT standards. This paper provides an overview of the F-Interop Platform and the tools. Nowadays testing tools for CoAP, 6TiSCH, OSCORE and L...
Article
IoT in Agriculture applications have evolved to solve several relevant problems from producers. Here, we describe a component of an IoT-enabled frost prediction system. We follow current approaches for prediction that use machine learning algorithms trained by past readings of temperature and humidity sensors to predict future temperatures. However...
Conference Paper
Full-text available
F-Interop allows implementors of IoT protocols to test compliance and interoperability of their implementation by connecting to a remote server in the cloud which contains and runs testing tools for different IoT standards. This paper provides an overview of the F-Interop Platform and the tools. Nowadays testing tools for CoAP, 6TiSCH, OS-CORE and...