QoS based Routing using the Fuzzy TOPSIS MCDM method to enhance the performance of the MANET

Optimal route selection based upon Quality of Service (QoS) requirements is a challenging task in a completely dynamic environment like MANET. To enhance the quality of service in MANET, route selection plays an important role. Existing well known routing protocols like AODV, DSR, etc. does not choose path based on QoS parameters. Different applications has its own requirements for route selection like for Email and File transfer application, less retransmissions should be there while delay can have secondary importance and for video conferencing applications, bandwidth must be high and delay must be low. So, there is an uncertain environment in which same QoS parameter may have less or more importance as per the application. Fuzzy based approach plays a vital role in an uncertain environment like adhoc network in which nodes are mobile. In this paper, Fuzzy TOPSIS (multi-criteria decision making method) based approach is proposed for the selection of optimal path among N available routes from source to destination based on QoS parameters. Total four QoS parameters are considered here reliability, bandwidth jitter and delay. AOMDV routing protocol is the base protocol for the proposed system and the proposed protocol QoS-AOMDV is finally compare and analyzed with AODV, AOMDV protocol. QoS- AOMDV results in better throughput and delay as compared to AODV and AOMDV protocols.