Publications

Scientific Publications

  • WAZIUP: A low-cost infrastructure for deploying IoT in developing countries
    Long-range radio are promising technologies to deploy low- cost Low Power WAN for a large variety of IoT applications. There are however many issues that must be considered before deploying IoT solu- tions for low-income developing countries. This article will present these issues and show how they can be addressed in the context of African ru- ral applications. We then describe the WAZIUP low-cost and long-range IoT framework. The framework takes cost of hardware and services as the main challenge to be addressed as well as offering quick appropriation and customization possibilities by third-parties.

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  • QoS for Long-Range Wireless Sensors under Duty-Cycle Regulations with Shared Activity Time Usage
    Long-range radio can connect sensors/IoT devices without complex and costly deployment of relay nodes. However, this flexibility comes with stricter legal regulations such as maximum radio activity time per 1-hour period. Under such constraints it is difficult to provide service guarantees, which is quite paradoxical when devices are deployed for surveillance systems. The approach we propose allows devices to go “exceptionally” beyond the activity time limitation by borrowing time from other devices.

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  • "Towards Quality of Service for Long-range IoT in Unlicensed Radio Spectrum". Proceedings of Wireless Days (WD'2016)

    The flexibility of long-range transmission comes at the cost of stricter legal regulations where duty-cycle approaches limits a transmitter to 1% duty-cycle in the general case. To provide better surveillance service guarantee we propose an activity time sharing mechanism for a pool of devices deployed by a single organization. Devices that need to go beyond the activity time limitation can borrow activity time from other devices. The proposed mechanism has been implemented as a library that can easily be integrated into existing projects.

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  • IoT, An Affordable Technology to Empower Africans Addressing Needs in Africa. Proceedings of the IST-Africa 2017 international conference.
    The opportunity for ICT intervention in Africa is huge especially for the so-called Internet of Things (IoT). The paper presents the EU-Africa H2020 WAZIUP project which focuses on IoT and related big data management for African applications. It takes cost of hardware and services as the main challenge to be addressed. The paper describes our proposed low-cost and open IoT gateway and platform for both robust and simple deployment and present real applications for Africa.

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  • Precision Livestock Farming Technologies. IEEE Global IoT Summit (GIoTS)
    Precision Livestock Farming (PLF) is core to satisfying the ever increasing world-wide demand for dairy products of good quality and societal concerns over animal welfare and health, whilst heavily reducing environmental load and resource use. The features of an Internet-of-Things (IoT) inspired platform with the capability to provision of a range of services that promote the adoption of precision farming principles is reported.

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  • IoT for Aquaculture 4.0 IEEE Global IoT Summit (GIOTS)
    While aquaculture and IoT have exponentially grown in the world in the last years, the combination of both domains still remains at its early stage. Although water monitoring is at the center of the aquaculture activity, its complexity can often push fish farmers to neglect it. We believe that developing user-friendly IoT tools for fish farming will lead to a new era of connected, responsible and efficient aquaculture. IoT for aquaculture needs to be smart, affordable, easy to deploy, reliable and highly efficient.

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  • "Enabling and deploying long-range IoT image sensors with LoRa technology", Proceedings of the IEEE MENACOMM conference
    Recent Low-Power Wide Area Networks (LPWAN) networks, e.g. Lora, introduce a high level of flexibility when deploying IoT devices. However, this flexibility also raises some performance issues that can become critical when introducing innovative IoT devices such as image sensor devices. This paper presents 2 control mechanisms to enable the deployment of such image sensor devices with LPWAN technologies: (i) an adapted Carrier Sense Multiple Access (CSMA) mechanism to avoid costly packet collision and (ii) an activity time sharing mechanism to mitigate the issue of duty-cycle.

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  • "Investigating and Experimenting CSMA Channel Access Mechanisms for LoRa IoT Networks", Proceedings of the IEEE WCNC conference
    Given the incredible worldwide uptake of LongRange (LoRa) networks for a large variety of innovative Internetof-Things (IoT) applications and the high flexibility in deploying private ad-hoc LoRa networks, it is important to consider dense environments and to improve the robustness of LoRa transmissions with more advanced channel access mechanisms. In this article, we investigate how a Carrier Sense mechanism can be adapted to decrease collisions in LoRa transmissions for both short and long messages.

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  • "Low-cost Antenna for IoT Deployment in Developing Country", Proceedings of the EurAAP EUCAP conference
    In this paper, the design of ultra-low cost antenna for gateway and end-node in rural areas is realized. The proposed structures are compared with on-the-shelf components to demonstrate an improvement on the performance combined with a more affordable integration cost.

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  • Robust CSMA for Long-Range LoRa Transmissions with Image Sensing Devices", Proceedings of the 10th Wireless Days conference
    As long-range technologies allow for simpler connectivity of remote devices, a tremendous increase of the device density proposing innovative services is expected in the next years. In this article, we consider a dense deployment of IoT devices generating a wide range of message sizes: short messages from traditional telemetry devices, medium-size message from multi-sensors devices and large message from image sensors. We investigate how a Carrier Sense mechanism can be adapted for LoRa networks to decrease collisions, taking into account this variety of message sizes and the difficulty to get a reliable free channel indication.

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