The defense of PhD thesis of Rabah Guedrez will be held on December 12th at 09:00 at IMT Atlantique, Rennes Campus , Petit Amphi. The thesis is entitled “Enabling Traffic Engineering Over Segment Routing”. It was made in the framework of a CIFRE thesis with Orange Labs (Lannion).
Most major operators use MPLS technology to manage their network via signalling and label distribution protocols. However, these protocols are complex to deploy, maintain and troubleshooting is often very difficult. The IETF has initiated the standardization of a segment routing architecture based on a simple control plane, lightweight, easy-to-manage and instantiated on MPLS or IPv6. This architecture is based on the concept of source routing, in which the packet header carries the indications of the path to follow to reach its destination. Suitable for simple use cases and natively resistant to failure, more complex use cases require the resolution of technological issues for which we offer several solutions. In this thesis carried out within Orange Labs, we were interested in the instantiation of the Segment Routing architecture on the MPLS transfer plan and more particularly in traffic engineering, particularly with resource reservation. We have proposed solutions to the problems related to the hardware limitation of current routers that do not allow the expression of all constrained paths. This work is divided into two parts: (i) the proposal of algorithms for computing and encoding segment routing paths in order to bypass hardware limitations. (ii) the definition of architectural requirements and the construction of a functional proof of concept. Finally, this thesis proposes new research issues to consolidate traffic engineering tools for segment routing.
Keywords : Segment Routing, Ingénierie de trafic, Optimisations, IP/MPLS, SDN
The defense of PhD thesis of Mahdi Ezzaouia will be held on November 8th at 10:00 at IMT Atlantique, Rennes Campus , Petit Amphi. The thesis is entitled “Opportunistic resource allocation in multi-cell wireless networks”. It was made in the framework of a “co-tutelle” with Ecole Nationale d’Ingénieurs de Tunis (ENIT), Tunisia.
The defense of PhD thesis of Xavier Corbillon will be held on October 30th at 10:15 at IMT Atlantique, Rennes Campus , Petit Amphi. The thesis title is “Enable the next generation of interactive video streaming”.
Omnidirectional videos, also denoted as spherical videos or 360° videos, are videos with pixels recorded from a given viewpoint in every direction of space. A user watching such an omnidirectional content with a Head Mounted Display (HMD) can select the portion of the video to display, usually denoted as viewport, by moving her head. To feel high immersion inside the content a user needs to see viewport with 4K resolution and 90 Hz frame rate. With traditional streaming technologies, providing such quality would require a data rate of more than 100 Mbps , which is far too high compared to the median Internet access bandwidth. In this dissertation, I present my contributions to enable the streaming of highly immersive omnidirectional videos on the Internet. We can distinguish six contributions : a viewport-adaptive streaming architecture proposal reusing a part of existing technologies ; an extension of this architecture for videos with six degrees of freedom ; two theoretical studies of videos with non-homogeneous spatial quality ; an open-source software for handling 360° videos ; and a dataset of recorded users’ trajectories while watching 360° videos. The work done during this thesis was published in eight international conferences and in one journal, and resulted in three “Best Paper Award”s.
Omnidirectional Video, 360°Video, Viewport-Adaptive Streaming, DASH, HEVC
The defense of PhD thesis of Alassane Samba will be held on October 29th at 14:00 at IMT Atlantique, Rennes Campus , Petit Amphi. The thesis title is “Data science for services in operated networks”.
Hristina Hristova, Xavier Corbillon, Gwendal Simon, Viswanathan Swaminathan (Adobe), and Alisa Devlic (Huawei) received the best paper award at IEEE MMSP 2017. The paper is entitled “Heterogeneous Spatial Quality for Omnidirectional Video”.
Xavier Corbillon, Francesca De Simone, Gwendal Simon and Pascal Frossard received the best student-paper award at ACM MMSys 2018, a top-ranking conference of multimedia. The paper is entitled “Dynamic Adaptive Streaming for Multi-Viewpoint Omnidirectional Videos”.
The defense of PhD thesis of Farah SLIM will be held on March 13th at 10:00 at IMT Atlantique, Rennes Campus , Petit Amphi. The thesis title is “Design and Implementation of Resource Allocation Algorithms for a Network Operating System”.
The defense of PhD thesis of Jialong Duan will be held on November 27th at 10:15 at IMT Atlantique, Rennes Campus , Petit Amphi. The thesis title is “Coordination inside Centralized Radio Access Networks with Limited Fronthaul Capacity”.
The defense of PhD thesis of Qipeng Song will be held on November 7th at 14:00 at IMT Atlantique, Rennes Campus , Petit Amphi.
The thesis title is “Radio Access Mechanisms for Massive Communication in Long-Range Wireless networks”.