Project : hipercom

Section: Contracts and Grants with Industry

CELAR

Participants : Cédric Adjih, Marc Badel, Philippe Jacquet, Anis Laouiti, Pascale Minet, Paul Muhlethaler, Adokoé Plakoo.

The CELAR project started in September 2002 for a year Its aim is to design and implement a demonstrator of mobile ad-hoc network MANET/OLSR. It is funded by CELAR (Centre d'Electronique de l'ARmement, French MoD/DGA).This testbed allows CELAR to make demonstrations with a real mobile ad-hoc network, and evaluate the potential benefits of such a network in military tactical applications, with a special focus on performances and reliability.

This project consists in two phases:

• The first phase concerns the installation and validation of the MANET/OLSR demonstrator. This demonstrator is made up of 18 nodes: 10 OLSR routers and 8 terminals (VAIOs and iPAQs). Routers and terminals are equipped with 802.11b cards and measurements tools. They implement the OLSR routing protocol. Performance measurements have been done in various configurations. These configurations can be characterized by:

  • network topology,

  • traffic types: different traffic types have been tested such as: (i) TCP traffics with/without UDP traffics, (ii) traffics generated by a same source toward different destinations, (iii) traffics generated by different sources and converging on the same destination...

  • node mobility: some nodes are carried by moving pedestrians, other nodes are embeddid within vehicles moving around the building hosting the platform.

  • injection of node failures: some nodes are switched off in order to measure the recovery time needed by OLSR to re-establish routes .

  • willingness of a node to route messages coming from other nodes : in OLSR, this is translated by the willingness parameter.

  Performances of MANET/OLSR demonstrator have been evaluated by the measurements of the following parameters:

  • power of the signal received from other nodes,

  • obtained throughput,

  • choice of the next hop to reach a given destination,

  • availability of routes,

  • time needed to get a route after a failure.

• In the second phase, we study future evolutions of this demonstrator. Two extensions are proposed:

  • what are the incidences of IPv6 on the routing protocol OLSR and how OLSR can work with IPv6;

  • we also study multicast routing and the protocol allowing a terminal or a router to notify its interest in a multicast group and receive multicast data.