Evaluating the Performance of Modified DSR in Presence of Noisy Links using QUALNET Network Simulator in MANET
For routing in MANET, finding the shortest path between nodes based on the classical hop-count metric may not always be the best routing criteria to be considered because the shortest path might be congested or error prone due to noisy interference leading to poor network throughput and packet delivery ratio. In our work, we use Signal-to-Noise Ratio (SNR) as the link-quality metric in a modified version of the of DSR protocol coined as MDSR which takes into consideration the SNR value of a wireless link in addition to the hop count metric to discover new routes. We have extensively used the QUALNET Simulator to evaluate our modified DSR protocol and the results indicate that the MDSR provides high throughput, high packet delivery ratio, reduced end-to-end delay and jitter in comparison to the original DSR protocol. We have compared the performance of DSR and MDSR in two different network topologies with 52 and 92 mobile nodes respectively. In each topology we have considered two cases one using DSR without considering the link SNR values and the other using MDSR on the same topology considering the link SNR values.