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Habilitation à diriger des recherches

Building the bridges between QoS and QoE for network control mechanisms

Adlen Ksentini 1
1 DIONYSOS - Dependability Interoperability and perfOrmance aNalYsiS Of networkS
Abstract : This last decade has known an explosion of the wireless access connectivity, mostly dominated by Wireless Local Area Networks (WLAN), 3GPP-based cellular networks (3G and 4G), and to a lesser extent by Digital Video Broadcast (DVB) networks. Combined with the emergence of smartphones and tablet PCs, wireless connectivity has changed the users' way to connect to the Internet, where we clearly observe that most of the connection to video platforms (e.g., Youtube, video on demand and IPTV) and social network applications are originated from wireless as well as mobile networks. However, massive accesses to these applications from wireless networks introduce several issues related to the increasing traffic, and the real-time property of some of these applications, which require a guarantee of Quality of Service (QoS) and Quality of Experience (QoE). These issues give rise to several challenges: (i) the need for network operators to have efficient mechanisms and protocols to avoid congestion and to support QoS; (ii) the need for content providers to consider the user context, in terms of bandwidth, user terminal, resolution, etc.), when creating and encoding an audio/video content. In order to address the challenges described above, the novelty of our contributions are in proposing dynamic and adaptive mechanisms to control network functionalities. The adaptive approaches are useful to tackle issues related to: (i) the network dynamics and changes in terms of congestion and contention level; (ii) the wireless channel dynamics and changes in terms of signal quality; (iii) the application dynamics and changes in terms of generated traffic; (iv) the users experience dynamics and changes in terms of QoE degradation/enhancement. Generally speaking, the conducted research work considers the network (or an application in the network) and the network functionality to control as a closed loop system. The objective is to modify (control) the system inputs (e.g., accept or reject a new flow in the network, increase the sleep duration for a wireless station, control congestion, etc.) and monitor the system outputs (e.g., delays, QoE, Queue size, etc.) in order to use these outputs for the next decision epoch of the controlled network mechanism. Our contributions are classified according to the type of monitored variable (system output) used by the network control mechanism. The first class of our research work pertains to QoS/Network centric (e.g. delays, the network load, the queue size of a node, delays, data rate) information, while the second class is based on human centric information by monitoring users' QoE.
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Habilitation à diriger des recherches
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Contributor : Adlen Ksentini <>
Submitted on : Wednesday, December 4, 2013 - 2:51:29 PM
Last modification on : Friday, July 10, 2020 - 4:20:00 PM
Long-term archiving on: : Saturday, April 8, 2017 - 3:38:12 AM


  • HAL Id : tel-00913872, version 1


Adlen Ksentini. Building the bridges between QoS and QoE for network control mechanisms. Networking and Internet Architecture [cs.NI]. Université Rennes 1, 2013. ⟨tel-00913872⟩



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