Abstract
The widely-used protocol in Mobile Ad hoc Networks (MANET) achieves a dynamic, self-organizing and on-demand multi-hop routing by means of the AODV routing protocol. In AODV, wireless links disconnect occasionally because the nodes on the routing path are unreachable, which makes AODV inefficient and unreliable. By constructing a mesh structure, AODV-BR improves AODV routing protocols and provides multiple alternate routes. The algorithm establishes the mesh and multi-path with the RREP of AODV, which does not transmit many control messages. In this paper, a new improved protocol AODV-BRL is proposed to increase the adaptation of routing protocols to topology changes by modifying AODV-BR. In AODV-BRL the alternate routes are created by the Extended Hello Message as well as RREP packets. Then the Extended Routing Table and the least hop count first (LHF) are proposed to determine the optimal alternative route that significantly reduces the distance between the repair node and the destination. Finally, the performance improvement is evaluated by simulations. According to simulation results it is evident that compared with AODV-BR and AODV, AODV-BRL has a higher packet delivery ratio and lower routing overhead.
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