In this paper, we propose a transport control performance improvement algorithm in heterogeneous networks. This paper discusses some novel algorithms to estimate the available bandwidth and to distinguish congestion error losses from wireless transmission error losses. The main characteristics of the algorithms is that it is non intrusive, i.e., it does not need to inject the traffic into the network in order to estimate the available bandwidth. Thus, our algorithms proposed can improve the throughput and can also be applied to different types of networks adaptively. We report experimental results to efficiency of the proposed algorithm.