Performance Evaluation and Analysis of Qos Routing using OLSR and DSDV Protocol in Manets under Different Scenario using NS-2

Abstract

In recent years, mobile computing has enjoyed a tremendous rise in popularity. The continued minimization of mobile computing devices and the extraordinary rise of processing power available in mobile laptop computers combine to put more and better computer-based applications into the hands of a growing segment of the population. At the same time, the markets for wireless telephones and communication devices are experiencing rapid growth. Projections have been made that, in nowadays there are more than billion wireless devices in use. Therefore, the wireless mobile computers or Mobile Ad Hoc Networks (MANET) have become very necessary. As the real-time applications used in today’s wireless network grow, we need some schemes to provide more suitable service for them. We know that most of actual schemes do not perform well on traffic which is not strictly CBR. Therefore, in this paper we try to judge the impact, respectively, of mobility models and the density of nodes on the performances (End-to-End Delay, Throughput and Packet Delivery ratio) of routing protocol (Optimized Link State Routing) OLSR and (Destination- Sequenced Distance Vector) by using in the first a real-time VBR (MPEG-4) and secondly the Constant Bit Rate (CBR) traffic using NS-2 Simulator. Experimentally, we considered the three mobility models as follows Random Waypoint, Random Direction and Mobgen Steady State. The efficient model should be chosen after analysis. The experimental results illustrate that the behavior of OLSR and DSDV change according to the model and the used traffics. To compare the performance of OLSR and DSDV routing protocol, the simulation results were analyzed by graphical manner and trace file based on Quality of Service (QoS) metrics: such as throughput, drop, and delay. Quality of Service (QoS) support in mobile ad hoc networks (MANETs) is a very challenging task because of the dynamic topology, limited resources and wireless 420 Aditi Kumari, Neha Gandotra, S. C. Gupta and Shrikant Upadhyay link characteristics. Finally, the performance differentials based on network load, mobility, and network size have been analyzed. Finally, we compare the performance on both cases under different scenario and got an exact idea that which routing protocol is well suitable under different condition and what measure should be kept in mind before deploying any type of routing protocol for any network design. This paper will give an idea for proper selection of routing protocol to improve QoS so, that the overall efficiency of the network improve with less effort and time. The simulation result will prove to be beneficial for the engineering and researcher from network designing and selection point of view and effort has been make to calculate and judge the result as good as possible.