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Abstract
Mobile Ad-Hoc Networks (MANETS) is a collection of wireless mobile nodes that are able to dynamically form a temporary network without any aid from fixed infrastructure or centralized administration due to no wired backbone.Ad Hoc networks are formed spontaneously and the nodes are highly mobile.Thispaper presents performance evaluations, comparisons, andanalysis for three routing protocols (AODV, DSR, and OLSR)to bring out their relative meritsundervarying network size and mobilitywith  various speed and pause times. The simulation is carried out using OMNET++ simulator based on the quantitative basic parameters like throughput, Packet transmission Ratio (PTR),packet transmission time delay and protocol overhead .The  nodes are distributed randomly in a grid network topology and mobile nodes moving using Random Waypoint mobility models. The results demonstrate that, undervarious node speeds and pause timesfor different network size, AODVoutperforms DSR and OLSR protocols, with respect to networkthroughput (by 0.9% and 4.4%, respectively). For protocoloverhead,DSR has lower overhead than both AODV and OLSR protocols (by 13.4% and 65.5%, respectively). In contrast, thepacket transmission time delay when using OLSR is shorter than whenusing both AODV (by 81.7%) and DSR (by 76.7%).Â
Highlights
Mobile Ad Hoc network (MANET) is the most innovative and challenging area of wireless networking
In order to show the effect of pause time variation on the performance of routing protocols,for each network size, two experiments were runfor two values of pause time (0-3) and (200-300) seconds.(0 -3) s means continuously movingand (200-300) means stable or low mobility
This could indicate that local repair can be used more efficiently to recover from loss at low speed due to the use of route caching in Dynamic Source Routing (DSR).While when node speed increases in stressful situations, the AODV protocol slightly outperforms the DSR protocol with respect to the network throughput as shown in Figure 9 for network size of 100 nodes
Summary
Mobile Ad Hoc network (MANET) is the most innovative and challenging area of wireless networking. MANET is mobility where all nodes are allowed to move in different a dimension which results in dynamic topology that leads to link breakage and path loss [5]. A major challenge that lies in MANET is route selection due to the limited resources and transmission range for a wireless radio, which is typically limited to 200 -300m [6,7,8].therouting protocol plays a very important role that affects the network‟s performance [7]. Different types of routing protocols give different network performances. These differences arise due to the differentmechanisms of these protocols.
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