Traffic-Aware Scheduling and Feedback Reporting in Wireless Networks

Matha DEGHEL
Soutenance de thèse de doctorat le 22 Mai 2017, 09h00 à CentraleSupelec (Gif-sur-Yvette) Amphi Mesny

Demand of wireless communication systems for high throughputs continues to increase, and there are no signs this trend is slowing down. Three of the most prominent techniques that have emerged to meet such demands are OFDMA, cooperative relaying and MIMO. To fully utilize the capabilities of systems applying such techniques, it is essential to develop efficient scheduling algorithms and, more generally, efficient resource allocation algorithms. Classical studies on this subject investigate in much detail settings where the data requests of the users are not taken into consideration or where the perfect and full CSI is assumed to be available for the scheduling mechanism. In practice, however, different limitations may result in not having perfect or full CSI knowledge, such as limited feedback resources, probing cost and delay in the feedback process. Accordingly, in this thesis we examine the problems of scheduling and feedback allocations under realistic considerations concerning the CSI knowledge. Analysis is performed at the packet level and considers the queueing dynamics in the systems with arbitrary arrival processes, where the main performance metric we adopt is the stability of the queues. The first part of the thesis considers a multipoint to multipoint MIMO system with TDD mode under limited backhaul capacity and taking into account the feedback probing cost. Regarding the interference management technique, we apply interference alignment (IA) if more than one pair are active and SVD if only one pair is active. The second part of the thesis considers a multiuser multichannel OFDMA-like system where delayed and limited feedback is accounted for. Two scenarios are investigated, namely the system without relaying and the system with relaying. For the latter one, an additional imperfection we account for is that the users have incomplete knowledge of the fading coefficients between the base-station and the relay.

Jury:

M. Vincent K. N. LAU  Hong Kong       University of Science and Technology  Rapporteur

M. Jean-Marie GORCE                        NSA Lyon                                             Rapporteur

M. Anthony EPHREMIDES                  University of Maryland, College Park   Examinateur

M. Jianwei  HUANG Chinese               University of Hong Kong                      Examinateur

M. Michel  KIEFFER                             Université Paris-Sud                           Examinateur

Mme Laura  COTTATELLUCCI            Eurecom                                              Examinateur

M. Mérouane DEBBAH                        CentraleSupélec                                 Directeur de thèse

M. Mohamad ASSAAD                        CentraleSupélec                                 CoDirecteur de thèse