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This study has evaluated three ad-hoc routing protocols indifferent scenarios considering nodes density and mobility.Overall the findings suggest that the existing routing protocolshave not been designed to provide energy efficient routeinstead to offer best efforts of less delay. That is why haveshown significant differences in energy consumption. TIRACST – International Journal of Computer Networks and Wireless Communications (IJCNWC), ISSN: 2250-3501 Vol.4, No2, April 2014116Figure 3. Impact of network size on the routing overhead 3)Energy Consumption In figure 4, the proactive protocol DSDV has maintained approximately constant energy consumption in terms of the average battery power consumed by the mobile nodes as the number of nodes increases from 10 to 50 nodes. On the other hand, the reactive protocol AODV energy consumption was similar to DSDV in the range from 10 to 20 nodes, then it increased from 20 to 30 nodes to reach the highest consumption at 30 nodes, then it decreased from 30 to 40 nodes and finally, it tends to increase once more from 40 to 50 nodes over DSDV. For medium size MANETs, AODV consumed more energy before decreasing for larger MANETs, while DSDV consumed a relatively lower energy for small, medium and larger MANETshere isno single protocol qualifying all the performance metrics.DSDV consumes the minimum energy and maximum amountis consumed in routing overhead. DSDV makes the networklifetime longer than others but consumes larger amount of
energy per packet and less throughput for high mobility. DSR
outperforms others and consumes minimum amount of energy
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