Abstract: As wireless networks with high data rate get widely deployed, improving the performance of TCP over these networks plays vital role. Wireless link losses have dramatic adverse impact on TCP performance due to the difficulty in distinguishing the congestion losses from wireless link losses. We studied the various existing Bandwidth Estimation Algorithms. Then we proposed a new technique to estimate the available bandwidth using the timestamp option of the TCP Header. The proposed system is evaluated in the integrated wireless environment and the simulated results are also shown.