Welcome to the homepage of Dr. Sofiene JELASSI

Sofiene JELASSI,
PhD, Computer Science
Please find here open source code of Jelassi-Rubino loss model used for characterizing loss distribution over IP networks


Research Scientist

Skype : jelassi.sofiene
Preferred Quote:
"All Models are Wrong, some are useful"

Short bibliography

Sofiene JELASSI received a Bachelor of Science and a Master of Science from the University of Monastir, Tunisia, in June 2003 and December 2005 respectively. He obtained a PhD in Computer Science from the University of Pierre and Marie Curie, Paris, France, in February 2010, under the supervision of Habib YOUSSEF and Guy PUJOLLE (dissertation). His doctoral thesis was entitled: Adaptive Quality Control of Packetized Voice Conversations over Mobile Ad-Hoc Networks. From June 2010 to December 2013, he was working as a R&D engineer at Inria within DIONYSOS research group, under the guidance of Gerardo RUBINO. Since January 2014, he is working as a postdoc fellow at GTA/UFRJ in Rio de Janeiro, Brazil under guidance of Guy Pujolle and Otto Durate. His research encloses IaaS (Infrastructure as a Service) , wired and wireless software defined networks (SDN), server and network virtualization, network monitoring, content-oriented management of mobile networks and services, mobile virtual network operators (MVNO), customized voice and video systems, quality of user experience (QoE) measurement and modeling, in-lab and in-field usability testing, crowdsourcing, user profiling, context sensing, service gamification, as well as social-driven emergency services. Dr. JELASSI has more than 20 papers published in international journals and conferences.

Research activities

Dr. JELASSI was involved in Celtic-QuEEN, a European research project around development of a generic QoE framework. The project includes twenty one partners located at seven countries.

Dr. JELASSI is a reviewer for Journals: IEEE Communications Surveys and Tutorials, IEEE Transactions on Multimedia, Elsevier Computer Communications, Annals of Telecommunications, Journal of Ubiquitous Systems and Pervasive, Networks IEEE Journal on Selected Areas in Communications (JSAC) and Journal Multimedia Tools and Applications. Moreover he was a reviewer for LCN-Demo Session 2011, LCN 2010 and 2011, IPTComm 2010 and IEEE WoWMoM 2010. Dr. JELASSI is reviewing many chapters of Data and Computer Communications textbook written by William STALLINGS. 


  1. Algorithmic and programming course
    • Data structure, control structure, procedures and functions, modules and libraries
  2. Internet tools course
    •  A course that gives for students skills for efficient and effective use of Internet services
  3. Large-scale client/server services course
    • Techniques for managing large scale dataset and users under client/service communication mode
  4. Design methodologies
    • Labs to use tools for UML (Unified Modeling Language) 
Reasearch areas 
Recent and major contributions

S. Jelassi and G. Rubino, Connections Analysis of Voice Traffic over MANETs and their Impact on Delay Variation, in the Proceedings of 18th IEEE Symposium on Computers and Communications (ISCC 2013), July 07-10, 2013, Split, Crotia
S. Jelassi and G. Rubino, A Perceptually Sensitive Markovian Model of Packet Loss Processes during VoIP Conversations, in the Proceedings of the 9th IEEE International Wireless Communications and Mobile Computing Conference (IWCMC'13), July 1-5, 2013, Cagliari, Italy
S. Jelassi and G. Rubino, Modeling of Network Delay Variation in Packet Voice Communications on Mobile Ad-hoc Networks,  in the Proceedings of ICC 2013, 09-13, June, Budapest, Hungary
S. Jelassi and G. Rubino, A Case Study of Listening Quality of Temporally Interrupted VoIP Service, in the Proceedings of Globecom 2012, December 03-07, 2012, Anaheim, CA, USA

S. Jelassi,
G. Rubino, H. Melvin, H. Youssef, G. Pujolle, Quality of Experience of VoIP Service: A Survey of Assessment Approaches and Open Issues, IEEE Communications Surveys and Tutorials, 14(2), pp. 491-513, 2012
This paper reviews existing subjective and objective quality assessment methodologies of packet voice communications. It surveys emerging single-ended parameter-based speech quality models suitable for integration inside VoIP systems. It presents future directions and challenges around measurement and exploitation of user experience of VoIP.

S. Jelassi, H. Youssef, C. Hoene, G. Pujolle, Single-ended parametric voicing-aware models for live assessment of packetized VoIP conversations, Telecommunication Systems, 49(1), pp. 17-34, 2012

This paper proposes a single-ended parameter-based quality models that consider unequal importance of played speech segments. The quality models consider voicing features of missing speech fragments. It presents an efficient way to notify the recipient about the features of dropped voice packets.


S. Jelassi and H. Youssef, Adaptive Play-out Scheduling Algorithm Tailored for Real-Time Packet-Based Voice Conversations over Wireless Ad-Hoc Networks, Elsevier Computer Networks, Volume 52 Issue 13, Special Issue on: Research and Trials for Reliable VoIP Applications, pp. 2473-2488, September 2008.
This work describes a context-aware de-jittering playback policy of packet voice communications over mobile ad-hoc networks. The major contribution consists of considering mobility events while dealing with delay-jitter. The strategy combines per-packet and per-talk-spurt based algorithms when adapting the playout delay to optimize the perceptual quality in different contexts.

Technical expertise and practical skills



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