A Modification to DSR using Multipath Technique

MANET is a collection of self organized mobile nodes with dynamic topologies and no fixed infrastructure. DSR is single path routing protocol applied for MANET and gives better performance when routes are not long enough. Its performance depends on different parameters value, like number of nodes and mobile connections. Thus routing efficiency is determined based on two aspects: firstly the time needed to react on a link break and secondly the ability to optimize to a shorter route when one is available. Developing better routing protocol became challenging task due to dynamic topology. Multipath routing is effective in mobile ad-hoc networks since link breakage is less likely to occur. A multipath extension to DSR namely Quality Aware Multipath DSR is proposed. Main interest is to divert the traffic through several node disjoint routes. Here source node maintains up to five paths corresponding to same destination as a result of route discovery procedure. The proposed work is implemented in NS2 and simulation results show that the proposed protocol achieves better packet delivery ratio, throughput and decrease average delay.