Abstract
Problem statement: In this research, it had been presented a novel Skew Scenario Model that has been developed and implemented for mobile ad hoc networks. There exist several mobility patterns that try to capture the behavior of the mobile devices under different circumstances, whereas in our work, the direction movement of the nodes is significantly specified horizontally, vertically and diagonally in the simulation area. Approach: Our novel Skew Scenario Model and the impact of mobility on MANET protocols had been compared and analyzed. The performance of DSDV and DSR under SSM in terms of packet delivery fraction, routing load and latency for varying source and destination traffic from 10, 20, 30, 40 and 50 under 100 nodes environment had been analyzed. Apart from this, our SSM with the existing waypoint model in 100 nodes environment had been compared. A suitable algorithm for SSM has also been developed. Results: Our simulation result showed that the functioning of our SSM had greatly influenced the performance of routing protocols in MANET environment. Simulation experiments confirm that for DSR under SSM, the PDF is highest between 93.56-99.43%, routing load is lowest between 1.005-1.068 and Latency is very less between 0.0163-0.049 sec, in the case of DSDV under SSM, the PDF is 63.22-79.104%, routing load is 1.20-1.58 and latency is 0.018-0.050 sec. The result revealed the fact that the reactive routing protocol DSR outperforms much more than the Proactive routing protocol DSDV. Our Novel Model has performed well when we compared it with existing waypoint mobility model while setting many source-destination connections. In DSR under SSM and waypoint model, PDF is between 93.56-99.43% in SSM and in waypoint 94.20-98.88%. Routing load in SSM is 1.0056-1.068, waypoint 1.01-1.06 seconds. Latency is between 0.026-0.063 in SSM and in waypoint 0.026-0.1235 sec. Conclusion: This study revealed the fact that the DSR discovers new routes faster and more effectively to the destination when the old route is broken as it invokes route repair mechanism locally also high route cache hit ratio in DSR, whereas in DSDV there is no route repair mechanism. In DSDV, if no route is found to the destination, the packets are dropped. While our novel SSM is compared with the existing waypoint model, the performance of SSM is better as far as PDF, Normalized Routing Load and latency are concerned. The reasons are velocity of mobile nodes are memory less random process and they move independently over other nodes also mobile node can move with a restriction in accordance with the given direction.
Highlights
In Mobile Ad hoc Networks (MANET), a group of mobile nodes communicates with one another without a central control infrastructure
An Ad hoc routing protocols is a convention or standard that controls how nodes come to agree with a way to route packets between computing devices in a mobile ad hoc network, nodes do not have a prior knowledge of topology of network around them, they have to discover it
The most common way to study mobile ad hoc networks is through simulations
Summary
In Mobile Ad hoc Networks (MANET), a group of mobile nodes communicates with one another without a central control infrastructure. The most common way to study mobile ad hoc networks is through simulations. A mobility model should attempt to mimic the movements of real MNs. Changes in speed and direction must occur and they must occur in reasonable time slots. A variety of mobility models and communication pattern have been developed in the simulators for performance evaluation of a design. We show from our simulations results that Skew Scenario Model has a considerable effect on the performance of these routing protocols (Johnson et al, 2004; Royer and Toh, 1999; Gerharz and de Wael, 2002; Perkins and Royer, 2003; Bettsltter et al, 2003)
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