Abstract: The TCP performance on wireless link and the related works are introduced. A new scheme is proposed to improve the TCP performance over the wireless link on the direction from mobile host to fixed network. It installs a TCP agent at the base station to monitor the segments dropped on the wireless link, then triggers TCP fast retransmission on the MH side by replicating and forwarding specific ACKs, which can effectively avoid timeout retransmission. Simulation results show that the new scheme has favorable performance.