Routing in MANETs is a challenging task because of dynamic nature of network topology and resource limitations. The Ad hoc On-demand Distance Vector (AODV) routing protocol is proposed for achieving dynamic, self-organizing and on-demand multi hop routing among mobile nodes in Mobile Ad hoc Networks (MANETs). In AODV, wireless links may be lost occasionally due to the nodes on the routing path being unreachable. For solving this issue, the AODV protocol provides a local repair mechanism that tries to find an alternative route to destination by broadcasting the RREQ message from the upstream node of the broken link. Although the local repair mechanism works with a specified Time to Live to limit the repair range of RREQ, large number of the broadcast RREQ messages result in extensive control messages and obvious power consumption for transmitting these broadcast messages. This paper proposes an improved routing protocol based on AODV for ad hoc network, which optimizes hello mechanism, local repair mechanism, and provides multi-backup pathways for the source node. Through network simulation, we show that new protocol can reduce network end-to-end delay and increase packet delivery ratio. Moreover, relative stability is another advantage of improved algorithm.
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