الملخص الإنجليزي
A Mobile Ad Hoc Network (MANET) is a collection of wireless nodes communicating with each other in the absence of any fixed infrastructure. The study of MANETs is a developing area of research and efforts have been taken for achieving efficient routing algorithms in mobile ad hoc networks.
In a MANET, to discover a route to a specific destination node, routing protocols use a broadcast scheme referred to as simple flooding, where each node retransmits every unique received packet exactly once. They blindly disseminate route request packets (RREQ) from the source to the rest of the network nodes, which cause high contention, and collision in the network leading to the broadcast storm problem. This thesis focuses on developing a simulation model called Ad hoc On-demand Distance Vector-Extended Grid Based Broadcasting (AODV-EGBB) routing algorithm. It is an enhanced version of the Ad hoc On-demand Distance vector (AODV) routing algorithm.
It uses a new routing request broadcasting algorithm for sending the route-request queries new RREQ. Its aim is to improve the performance of the AODV algorithm by plugging a new broadcasting algorithm called Extended Grid Based Broadcasting (EGBB) [2] for sending efficiently the RREQS.A simulation model based on Network Simulator (ns-2) has been developed for the new protocol. In order to check the improvement of the original AODV, a comparison between the original AODV and the new improved AODV algorithms is measured. The performance results of both algorithms are measured under the following network parameters: network density, node mobility and traffic load. Simulation results show that AODV-EGBB has improved considerably the original AODV algorithm in terms of the end-to-end delay, average reachability, number of dropped packets and number of sent packets. For example, with a traffic of 12 packets/second and node mobility speed of 6 m/sec, the average reachability achieves about 93% in the AODV-EGBB whereas it is 31% using the original AODV when the number of nodes is 300 nodes. In addition, when 150 nodes are placed over an area of 1000 meter x 1000 meter, an average delay of about 0.07 Seco second is reached by the AODV-EGBB when the speed is 12 m/sec, whereas it is 0.15
second for the original AODV which is 53% better.
