Français Anglais
Accueil Annuaire Plan du site
Accueil > Evenements > Séminaires
Séminaire du LRI
Contention-based Uplink CSI Feedback with Variable Collision Protection for a Cellular Multi-Carrier System
Megumi Kaneko

11 June 2012, 14h00 - 11 June 2012, 16h00
Salle/Bat : 475/PCRI-N
Contact :

Activités de recherche :

Résumé :
The optimization of the Downlink (DL) resource allocation in Multi-Carrier (MC)-based wireless systems requires the feedback of the Channel State Information (CSI) for each user/subchannel to the Base Station (BS), consuming a high amount of Uplink (UL) radio resources. To alleviate this problem, several works have considered contention-based CSI feedback, where users attempt to randomly access the UL control channel, experiencing collisions.
In this talk, we propose a feedback scheme based on the idea of variable collision protection, where the probability that a feedback information experiences a collision depends on its importance. By partitioning the CSI into orthogonal layers of priority, and allocating different numbers of feedback slots to each layer, this scheme ensures that the feedback success probability is higher for the CSI with better quality, which is more likely to be used by the scheduler. Furthermore, we present a theoretical performance analysis of the proposed scheme, assuming Maximum CSI (Max CSI) and normalized Proportional Fair Scheduler (PFS), where a tight approximation of the achievable throughput is obtained assuming discrete Adaptive Modulation (AM) and CSI feedback which are relevant for practical systems. Analytical and simulation results show that our proposed scheme provides an excellent trade-off between system performance and feedback overhead.

Pour en savoir plus : http://www.msys.sys.i.kyoto-u.ac.jp/~meg/index.html
Séminaires
A Family of Tractable Graph Distances
Gestion de données du Web
Wednesday 04 July 2018 - 10h30
Salle : 465 - PCRI-N
Stratis Ioannidis .............................................

Binary pattern of length greater than 14 are abeli
Combinatoire
Friday 29 June 2018 - 14h30
Salle : 445 - PCRI-N
Matthieu Rosenfeld .............................................

Distributionally Robust Optimization with Principa
Optimisation combinatoire et stochastique
Friday 29 June 2018 - 11h00
Salle : 455 - PCRI-N
Dr. Jianqiang Cheng .............................................

Caractérisation de réseaux égocentrés par l'énumér
Friday 15 June 2018 - 14h30
Salle : 455 - PCRI-N
Raphaël Charbey .............................................

DATA VERACITY ASSESSMENT: HOW A-PRIORI KNOWLEDGE E
Intégration de données et de connaissances
Friday 15 June 2018 - 14h00
Salle : 445 - PCRI-N
Valentina Beretta .............................................