Enhanced TCP WestwoodNR congestion avoidance mechanism (WestwoodNRBWP) in VANET

The Transmission Control Protocol (TCP) provides continuous, consistent, congestion restricted connections over the Internet. The research presented idea gives the performance of various existing transport layer protocol over Vehicular Ad hoc Network (vAnET). One version of TCP called TCP WestwoodNR that dynamically adjusts the congestion window. TCP WestwoodNR constantly estimate the end-to-end bandwidth based on ACK reception rate. These make TCP WestwoodNR more tough to random losses due to wireless channel problems. So these research works improves the performance of TCP WestwoodNR. TCP WestwoodNR cannot bifurcate the loss that packet failure is due to congestion or random loss (link failure). To overcome the problem of TCP WestwoodNR, new Transmission Control Protocol was developed WestwoodNRBWP (Bandwidth Proportionality) which bifurcate the loss using Losses Discrimination scheme. Losses Discrimination Scheme uses last three values of RTT. After loss bifurcation, TCP WestwoodNRBWP check the network status in congestion Avoidance and according to that it set the congestion window (CWND). For the purpose of simulation of proposed algorithm TCP WestwoodNRBWP, the well known network simulator NS-2 and traffic simulator Bonn Motion are used for compare it to real TCP WestwoodNR. Simulation results prove that the future scheme achieves improved throughput and congestion window than real TCP WestwoodNR.