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Theses

Stratégies de routage multi-chemin dans les réseaux sans fil multi-sauts

Abstract : Wireless multi-hop networks consist of a collection of mobile and/or fixed nodes which dynamically exchange data with (or without) reliance on a (any) centralized administration. They are by definition self-organized. The frequent topological changes make multi-hop routing a crucial issue for these networks. To overcome these problems, new forms of routing schemes are used as the multipath routing (MP). MP routing uses multiple paths to send data and can be regarded as an effective solution for these networks. The purpose of this PhD thesis is to study the MP routing techniques in a wirelessmulti-hop context for better performance. We choose for our study a MP extension of OLSR, called MP-OLSR. We evaluate its performance under various scenarios in NS-2. These tests have led us to highlight two problems in MP-OLSR : the long recovery delays when facing network failure situations and the allocation strategy of data on multiple paths. We define and seek to evaluate the latency introduced by both protocols OLSR and MP-OLSR to find a new path after a link failure. We propose three new different recovery schemes and accordingly extend these original protocols in order to decrease theexpected latency and reduce the packet loss rate of transmitted flow. We also propose a mechanism which is able to detect the deterioration of the link quality during the transfer of data traffic. The information derived from this mechanism is used to adjust the proportion of traffic to be assigned to each path according to network conditions. This new version of MP-OLSR protocol is evaluated by simulation.
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Inès Doghri. Stratégies de routage multi-chemin dans les réseaux sans fil multi-sauts. Autre [cs.OH]. Ecole normale supérieure de lyon - ENS LYON, 2012. Français. ⟨NNT : 2012ENSL0714⟩. ⟨tel-00828394⟩

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