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Research Seminar: Adaptive Load Sharing and Load Control in Hybrid Terrestrial/Satellite Networks in the 5G Era

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Conférencier : Prof. Riadh Dhaou (Institut National Polytechnique de Toulouse)
Date de l'événement : lundi, 11 décembre 2017, 14:00 - 15:30
Lieu : Room 4.300, Maison du Savoir
2, avenue de l'Université
L-4365 Esch-sur-Alzette

Smart cities involve the full integration of information and communication technologies to enable the best services to mobile users and the efficient collection of content from a multitude of surveillance and monitoring objects.

The formation of networks composed of satellite and terrestrial segments raises the challenge of efficiently managing the radio resources of each of the two heterogeneous components, given their latencies and their access methods. An important part of the presented work is to propose architectures and mechanisms allowing efficient and harmonious operation of the different elements of the hybrid network. The study of these systems requires a fine modeling of some functions (related to the management of mobility, the allocation of resources and the load sharing, etc.) to optimize the performance of the overall system by ensuring the continuity of the service.

During this presentation, we focus on two open research topics: routing in hybrid terrestrial/satellite networks and medium access control including M2M traffic.

Improving content delivery with size-aware routing in hybrid satellite/terrestrial networks: As Internet usages expand quickly, access networks are modernized with new technologies like fiber-optic communications. However, upgrade costs are prohibitive in sparsely populated areas, the latter turning notably towards satellite connection. Indeed, this technology allows deploying a high-throughput Internet access quickly in these regions. Nevertheless, GEO satellites induce a long delay, not experienced on terrestrial infrastructures despite their low throughput. We consider a heterogeneous network with both a satellite and a terrestrial path. This kind of architecture is known to be difficult to operate because of the important differences between used technologies. The emerging MP-TCP transport protocol, whose design enables to aggregate disparate paths properly, brought new hopes for heterogeneous networks. However, it does not take user Quality of Experience (QoE) into account as it focuses on maximizing the links occupancy. We propose an intelligent path selector using the content size to maximize users QoE in heterogeneous networks. Before detailing this method, we describe the architecture able to retrieve the size of delivered contents thanks to Content Delivery Network Interconnection (CDNI). Finally, we implement a testbed to evaluate the behavior of the proposed routing method. The results show a significant improvement of the delivery performance, outperforming MP-TCP.

Adaptive load control for IoT based on satellite communications: The Internet Of Things (IoT) market grows more and more every year. Today, the number of IoT devices is estimated around 8 billion but forecasts announce 20 billion devices for 2020. Terrestrial or satellites communications systems are already deployed to answer the connectivity need. The overload on the random access channel is an issue since it may cause service outage. Within the Narrow Band IoT, created by the Third Generation Partnership (3GPP), the Access Class Barring (ACB) is the load control mechanism. Unfortunately, the 3GPP did not specify a method to compute the load control parameters. In the context of a satellite IoT communication system using a satellite random access method, we propose a method to compute dynamically ACB based load control parameters. Thanks to our method, the load control mechanism reaches excellent results regarding transmission reliability and energy consumption for various traffic scenarios.

Riadh Dhaou is Associate Professor with the Toulouse INP (Institut National Polytechnique de Toulouse). He is attached to the Telecom and Networking department of the ENSEEIHT. He is member, since 2003, of the IRT team of the IRIT (Institut de Recherche en Informatique de Toulouse) Laboratory. He received the Engineering degree in computer science (Diplome d'Ingénieur Concepteur en Informatique) from the ENSI (Ecole Nationale des Sciences de l'Informatique), University of Tunis II in 1997, and the D.E.A. (Diplome d'Etudes Approfondies) in Computer systems from the Université Pierre et Marie Curie in Paris (Paris VI), in 1998. He was awarded, respectively, a Ph.D. degree in Computer Systems, Telecommunication and Electronic by the University of Paris VI (in November 2002) and the HDR (Habilitation à Diriger des Recherches) by the Toulouse INP (in November 2017). His research interests include statistical characterization and modelling of mobility, mobile and space communications, cross layer schemes modelling and optimization, performance analysis of wireless networks, autonomous multi-hop/cooperative communications systems, capacity and outage analysis of multi-user heterogeneous wireless systems, resource allocation, design and performance evaluation of wireless sensor networks and energy consumption optimization.

Since 2003, he is scientific chief of project with the cooperative laboratory TéSA, a non-profit association, leading research studies and PhDs in Telecommunications for Space and Aeronautics. Since November 2017, he is the carrier of the satellite theme within the IRT team. He has jointly supervised 14 Ph.D. Theses (nine were defended) and three master-degree theses. He has published about 78 papers (seven journals and five book chapters) and achieved 35 research grants in satellite and sensor networks (CNES, Thales-Alenia Space, Airbus D&S). He has been technical leader to seven research grants in satellite networks domain and participated to several industrial and academic grants. He was involved in the Technical Program Committee of seven International Conferences. He was General Chair of PSATS'2013 and was member of Organization Committees of two other International Conferences. He is, since 2013, part of the Editorial Board of WINET (The springer Wireless Networks journal). He participated to 11 PhD thesis committees. He participated to several European and National projects: - CAPES-COFECUB Project MMAPS (Management, Mobility, Security, Architecture and Protocols for the Future Internet of Things) - ANR Project CAPTEURS - RNRT Project DILAN - ESPRIT Project BISANTE (Broadband Integrated Satellite Network Traffic Evaluation) - RNRT Project CONSTELLATIONS He also participated to the Network of Excellence NoE Euro-NGI, particularly on the evolution of the IP networks.