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Research activities: Ad hoc networks
Ad hoc networks are systems that can establish communication sessions between users without using any kind of infrastructure. Hence, the network must be self-organized and dynamically adaptive. Nodes in ad hoc networks are in constant movement. Delivering packets to a specific destination becomes a complex task. Today, four routing protocols were standardized by the IETF (Internet Engineering Task Force) to offer a solution for routing problems. These solutions are divided into two categories: proactive (routes are always available) and reactive (routes are discovered on demand). OLSR (Optimized Link State Routing Protocol), developed at INRIA, is a proactive protocol based on link state routing mechanisms.

In our work we have addressed issues of quality of service and security. All standardized protocols try to find a route from a source to a destination by considering only one metric: the number of hops. Also, these protocols do not take into account any security consideration and still are vulnerable to attacks. We consider up to four metrics to establish routes, including delay, available bandwidth, jitter, loss probability, etc. This should allow flows to reach their destination with an increased quality of service. We also consider the multipath routing and path oscillation problems. Concerning security, we are working on a solution to secure OLSR. Our mechanism must enumerate the most important attacks and provides mechanisms that eliminate all negative effects on routing information. The solution will be based on distributing secure keys to nodes without using any centralized mechanism since this is not feasible in an ad hoc context.


Joint Inria project teams

Research highlights
  One step forward: Linking wireless self-organizing network validation techniques with formal testing approaches

Contracts & grants

Software & patents


  JOHNEN Colette
  TIXEUIL Sébastien
  AL AGHA Khaldoun
  RAHME Joseph
  ODOU Simon
  BENFATTOUM Youghourta

Ph.D. dissertations & Faculty habilitations
  Several contributions to self-stabilization
  Toward self-stabilizing large-scale systems
  Auto-stabilisation et partitionnement
  Distributed Algorithms for Security and Quality of Service in Mobile Ad Hoc Networks

Research activities