Improving multiple routing in mobile ad hoc networks using fuzzy models

Abstract

Nowadays, the use of Mobile Ad-Hoc Network (MANET) devices increases extremely. Dynamic Source Routing protocol (DSR) is a reactive routing protocol designated for MANET, whenever a route is demanded, DSR checks route cache, if no route exists; it floods the network with Route Request packets (RREQ). Route discovery process may result in multiple RREQ packets traversing the network until a Route Reply packet (RREP) is sent back. However, the discovered route may contain nodes with no backup routes to the next hop then path failure may occur. Moreover, due to users’ mobility and limited transmission ranges, the routing protocol should consider routes stability. Therefore, improving routing will enhance the whole network performance. In this paper, two fuzzy models were proposed to enhance routing decisions by Fuzzy Stability models (FSDSR1 & FSDSR2). The proposed models consider the following parameter: route discovery time, total route replies, delivery ratio, and the number of retransmission attempts, MANET delay, and throughput. The results showed that FSDSR2outperformed the state of art protocol DSR and FSDSR1.