The intern would join the Software Defined Mobile Networks department of Nokia Bell Labs Paris-Saclay for a 6-month internship focusing on the control of millimeter-wave transmissions in indoor environments. The expertise of the host team includes control and optimization of the Radio Access Network (RAN), as well as integration of IT architectures and techniques in mobile networks.
In 5G, to access large bandwidth, deployment of mm-wave communications is planned. As in higher frequency bands the propagation conditions are different compared to the frequencies currently used for mobile communications, deployment and control of radio access points (RAPs) must be redesigned. Particularly adapted for short-range communications, mm-waves seem to be adapted for indoor coverage. Furthermore, Cloud Radio Access Network (C-RAN) architecture where several light-weight RAPs are connected to a central processing unit enables to coordinate user association to avoid interference and increase the transmission rates. In 5G communications, the end-to-end processing of a given service provided to a user is realized by a so-called network slice  that includes all the processing and control functions required for the service. Software Defined Networking (SDN) enables efficient control of the services inside a network slice. In addition, to realize coordination efficiently between the RAPs, the targeted indoor radio access network is controlled using SDN tools.
In the scope of this project, the intern will be in charge of modeling mm-wave transmissions in several types of indoor environments. As a first step, he/she will study current wireless network deployments (including WLAN) and select use cases relevant for 5G. Then, this environment with the deployed mm-wave RAPs should be modeled using Matlab. In this deployment model, he/she should integrate the characterization of downlink communications in terms of coverage, rate and signal-to-interference-plus-noise ratio (SINR) using results described in .
The second part of the internship will be dedicated to finding an algorithm that allows to manage in the indoor environment users served by different network slices in a way that maximizes the transmission rates. The architecture of the SDN-enabled control plane that realizes the coordination between the RAPs needs to be considered in the design of the algorithm. If the time allows, the algorithm can be implemented and deployed in an SDN controller that would communicate with the matlab model to manage it dynamically.
 Jeffrey G. Andrews, Tianyang Bai, Mandar Kulkarni, Ahmed Alkhateeb, Abhishek Gupta, Robert W. Heath Jr “Modeling and Analyzing Millimeter Wave Cellular Systems” IEEE Trans. Communications, invited paper (https://arxiv.org/abs/1605.04283)
Beginning of the internship: from the 27th of March
(c) GdR 720 ISIS - CNRS - 2011-2015.