| Summary: | The Hydrodynamic characteristics has been considered for routing in Wireless Sensor Networks by various researchers and presented several methods. The flow and friction based routing approaches would produces sustainable results but would not improve the QoS. To improve the performance of F<sup>2</sup>VHDR (Flow –Flow-Friction-Velocity Based Hydro Dynamic Routing), this paper present BF<sup>2</sup>VHDR (Back Flow –Flow-Friction-Velocity Based Hydro Dynamic Routing) algorithm. The F<sup>2</sup>VHDR method misses the back flow of packets due to route failure or higher traffic conditions which affects the service performance. As a solution to this, the BF<sup>2</sup>VHDR algorithm is presented. The proposed BF<sup>2</sup>VHDR approach monitors the flow in both the sides of the route. The back flow occurs when it exist a route failure and higher traffic. Also, it may occur when the routing protocol of the other nodes would choose the reverse route as a best way to reach the same destination. Monitoring the back flow, general route flow, friction by traffic and velocity measures, the proposed method computes backward hydrology routing weight and forward hydrology routing weight. Using both the measures, the proposed method computes a route support weight for each route which has been used to perform route selection. The proposed approach improves the performance of throughput and increases the lifetime of the sensor nodes.
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