Charalampos (Haris) Orfanidis
CV — Publications — Group — Teaching

Publications

Conferences

Adaptive Mobility Control in LoRaWAN via Reinforcement Learning
A. F. Valentin, S. K. Janum, F. F. Jurado-Lasso, X. Fafoutis, C. Orfanidis
IEEE 21th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), 2025
This work demonstrates how a lightweight (~40 kB) Reinforcement Learning model can dynamically steer a mobile LoRaWAN gateway, doubling or tripling packet delivery compared to fixed or heuristic paths.
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Intermittent Neuromorphic Wearable Systems
J. A. Qazi, E. Njor, M. B. Stuart, X. Fafoutis, C. Orfanidis
IEEE Engineering in Medicine and Biology Society (EMBC), 2025
Exploring the synergy between Neuromorphic and Intermittent Computing for Wearable Systems, enabling energy-efficient AI processing on battery-free devices.
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How Mature is 5G Deployment? A Cross-Sectional, Year-Long Study of 5G Uplink Performance
I. Khan, M. Ghoshal, J. Angjo, S. Dimce, M. Hussain, P. Parastar, Y. Yu, C. Fiandrino, C. Orfanidis, S. Aggarwal, A. C. Aguiar, O. Alay, C. F. Chiasserini, F. Dressler, Y. C. Hu, S. Y. Ko, D. Koutsonikolas, J. Widmer
IFIP/IEEE Networking, 2024
A comprehensive analysis of 5G uplink performance across different deployment scenarios, providing insights into network maturity and user experience.
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Detection of Mobile LoRa Jammers
B. J. Bleszynski, C. Orfanidis, X. Fafoutis
IEEE Virtual Conference on Communications (VCC), 2023
Investigating methods to detect mobile LoRa jammers in wireless networks, with implications for network security and reliability.
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Short-Term Wireless Connectivity Prediction for Connected Agricultural Vehicles
B. Ö. Grétarsson, C. Orfanidis, L. Marchegiani, X. Fafoutis
IEEE 26th International Conference on Intelligent Transportation Systems (ITSC), 2023
A method to predict wireless link quality for mobile IoT communication based on a lightweight neural network, applied to connected agricultural vehicles.
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Mobility-focused Joining in TSCH Networks
O. O. Nielsen, L. K. Schnügger, C. Orfanidis, X. Fafoutis
IEEE 47th Conference on Local Computer Networks (LCN), 2022
Investigating mobility-aware joining procedures for Time-Slotted Channel Hopping networks in industrial applications.
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Monitoring Neurological Disorders with AI-enabled Wearable Systems
C. Orfanidis, A. Darwich, R. Cheong, X. Fafoutis
ACM 2nd Workshop on Emerging Devices for Digital Biomarkers (DigiBiom), 2022
Exploring the use of AI-enabled wearable systems for monitoring neurological disorders, with applications in digital biomarkers.
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Plantar Biometrics for Edge Computing
M. Stege, C. Orfanidis, X. Fafoutis
ACM 2nd Workshop on Body-Centric Computing Systems (BodySys), 2022
Investigating plantar biometrics for secure authentication in edge computing environments.
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Active Connectivity Fundamentals for TSCH Networks of Mobile Robots
C. Orfanidis, P. Pop, X. Fafoutis
IEEE 4th International Workshop on IoT Applications and Industry 4.0 (IoTI4), 2022
Exploring active connectivity mechanisms for reliable communication in Time-Slotted Channel Hopping networks used by mobile robots.
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Human Computer Interaction aspects of Low-Power Wide Area Networks for Wearable Applications
C. Orfanidis, M. Jacobsson, X. Fafoutis
ACM 1st Workshop on Computer Human Interaction in IoT Applications (CHIIoT), 2021
Examining human-computer interaction considerations for LPWAN-based wearable applications.
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A Discreet Wearable Long-Range Emergency System based on Embedded Machine Learning
C. Orfanidis, R. B. Haj Hassen, A. Kwiek, X. Fafoutis, M. Jacobsson
IEEE 6th PerCom International workshop on Pervasive Health Technologies (PerHealth), 2021
A wearable emergency system that uses embedded machine learning for discreet, long-range communication in critical situations.
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Cross-technology Clear Channel Assessment for Low-Power Wide Area Networks
C. Orfanidis, L. M. Feeney, M. Jacobsson, P. Gunningberg
IEEE 16th International Conference on Mobile Ad-Hoc and Smart Systems (MASS), 2019
Investigating cross-technology interference and clear channel assessment mechanisms for LPWAN coexistence.
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Investigating interference between LoRa and IEEE 802.15.4g networks
C. Orfanidis, L. M. Feeney, M. Jacobsson, P. Gunningberg
IEEE 13th International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob), 2017
Analyzing interference patterns between LoRa and IEEE 802.15.4g networks in shared spectrum environments.
Paper BibTeX

Journals

How Mature is 5G Deployment? A Cross-Sectional, Year-Long Study of 5G Uplink Performance
I. Khan, M. Ghoshal, J. Angjo, S. Dimce, M. Hussain, P. Parastar, Y. Yu, C. Fiandrino, C. Orfanidis, S. Aggarwal, A. C. Aguiar, O. Alay, C. F. Chiasserini, F. Dressler, Y. C. Hu, S. Y. Ko, D. Koutsonikolas, J. Widmer
Elsevier Computer Communications (COMCOM), 2025
A comprehensive study analyzing 5G uplink performance across multiple countries over a year-long period, providing insights into deployment maturity and performance characteristics.
Paper BibTeX
HRL-TSCH: A Hierarchical Reinforcement Learning-based TSCH Scheduler for IIoT
F. F. Jurado Lasso, C. Orfanidis, J. F. Jurado, X. Fafoutis
IEEE Transactions on Cognitive Communications and Networking, 2024
A hierarchical reinforcement learning approach for scheduling in Time-Slotted Channel Hopping networks, optimized for Industrial Internet of Things applications.
Paper BibTeX
TSCH Evaluation Under Heterogeneous Mobile Scenarios
C. Orfanidis, A. Elsts, P. Pop, X. Fafoutis
IoT Journal, 2021
Evaluating Time-Slotted Channel Hopping performance in heterogeneous mobile IoT scenarios.
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TSCH-over-LoRa: Long Range and Reliable IPv6 Multi-hop Networks for the Internet of Things
M. Haubro, C. Orfanidis, G. Oikonomou, X. Fafoutis
Internet Technology Letters, 2020
A protocol for reliable, long-range IPv6 multi-hop networks combining Time-Slotted Channel Hopping with LoRa technology.
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Energy-Efficient Medium Access Control for Energy Harvesting Communications
X. Fafoutis, A. Di Mauro, C. Orfanidis, N. Dragoni
IEEE Transactions on Consumer Electronics, 2015
A medium access control protocol designed for energy harvesting wireless sensor networks.
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Altruistic Backoff: Collision Avoidance for Receiver-Initiated MAC Protocols for Wireless Sensor Networks
X. Fafoutis, C. Orfanidis, N. Dragoni
International Journal of Distributed Sensor Networks, 2015
A collision avoidance mechanism for receiver-initiated MAC protocols in wireless sensor networks.
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Posters/Demos

Toward a Testbed for the Internet of Underwater Things: Challenges and Considerations
F. Bahamondes, M. R. Markvardsen, M. T. Henriksen, C. Orfanidis
(Poster) ACM international joint conference on Pervasive and Ubiquitous Computing (UbiComp), Helsinki, Finland, 2025
Poster on early testbed design challenges and considerations for the Internet of Underwater Things.
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Intermittent Low-Power Wide Area Networks
C. Orfanidis, A. B. Bischoff, L. Pezzarossa
(Poster) ACM 29th Annual International Conference on Mobile Computing and Networking (MobiCom), Madrid, Spain, 2023
Poster presenting intermittent operation and power-saving strategies for LPWAN deployments.
PDF BibTeX
Towards Battery-Free LPWAN Wearables
C. Orfanidis, K. Dimitrakopoulos, X. Fafoutis, M. Jacobsson
(Demo) ACM 7th International Workshop on Energy Harvesting & Energy-Neutral Sensing Systems (ENSsys), New York, NY, 2019
Demo of a battery-free LPWAN wearable, demonstrating energy harvesting and long-range communication.
PDF BibTeX
Preliminary results on LoRaWAN and IEEE 802.15.4-SUN Interference
L. M. Feeney, C. Orfanidis, M. Jacobsson, P. Gunningberg
(Poster) ACM 16th Conference on Embedded Networked Sensor Systems (SenSys), Shenzhen, China, 2018
Poster summarizing early interference findings between LoRaWAN and IEEE 802.15.4-SUN networks.
PDF BibTeX
Measuring PHY layer interactions between LoRa and IEEE 802.15.4g networks
C. Orfanidis, L. M. Feeney, M. Jacobsson
(Poster) IEEE/IFIP Networking 2017, Stockholm
Poster on PHY-layer interactions and coexistence between LoRa and IEEE 802.15.4g systems.
PDF BibTeX
Increasing Robustness in WSN using Software Defined Network Architecture
C. Orfanidis
ACM/IEEE (Poster) PhD forum at the 15th ACM/IEEE Conference on Information Processing in Sensor Networks (IPSN 2016), April 2016, Vienna
Poster describing software-defined approaches to improve robustness in wireless sensor networks.
PDF BibTeX