Current research topics:

  • Conflict-free scheduling of wireless transmissions in a multichannel environment
              - Minimum number of slots for data gathering in any network topology,
              - Maximum number of transmissions per link to achieve a given reliability on a path,
              - Distributed scheduling algorithms in a TSCH (Time Slotted Channel Hopping) network:
                    . compliant with the approach of the 6TiSCH IETF working group,
                    . minimizing the data delivery delays and ensuring the reliability requested.
     
  • Use of UAVs and mobile robots:
              - Goal:
                    . Coverage of an area, coverage of points of interest, Connectivity (intermittent or permanent) with far nodes,
                    . Offloading of overloaded access points, Deployment of wireless sensor nodes,
                    . Data gathering or item gathering like for example unused cars brought back to parking places.
              - Minimize the number of mobile robots or UAVs used and their trajectories:
                    . multi-criteria optimization, genetic algorithms, game theory: hedonic coalition formation.
              - Under the constraints of energy, latency, quality of service (QoS) and fairness between the UAVs.
     
  • Machine learning techniques in networks and data centers
              - Proactive management of resources based on the prediction of resource requests;
                    . Computation of a bound on the energy saving in a data center,
                    . Prediction of resource requests.
              - Wireless sensor networks: routing based on link quality prediction,
              - Content delivery networks: collaborative caching based on content popularity prediction.
             
     
  • Previous research topics:

  • Energy efficiency in wireless ad hoc and sensor networks
              - Node activity scheduling,
              - Energy efficient routing,
              - Cross-layering.
     
  • Mobile ad-hoc networks
              - QoS routing,
              - Optimized flooding in a multi-hop wireless network,
              - Multicast routing,
              - QoS support.
     
  • Real-time scheduling
              - Feasibility conditions and worst case analysis,
              - Quality of service,
              - Deterministic guarantee of end-to-end response time,
              - Dimensioning and admission control,
              - Trajectory approach versus holistic approach.
     
  • Multimedia systems
              - End-to-end deadline assignment,
              - Guarantee of timing constraints for a nice viewing of multimedia contents in a video on demand system,
              - Dimensioning and admission control.
     
  • Distributed real-time systems with persistent objects
              - Distributed tasks with a graph structure and real-time constraints (ex. completion deadline),
              - Concurrency control,
              - Fault-tolerance.
     
  • Replicated data
              - Replicas consistency,
              - Replicas freshness,
              - Fault-tolerance and feasibility conditions.