介紹了無線鏈路上的TCP性能問題和相關的工作。提出了一種改進從移動主機到固定網絡方向TCP性能的方案，在基站處設置TCP代理來監視在無線鏈路上丟失的TCP報文段，通過復制和發送重復的ACK來觸發MH端TCP的快速重傳，有效地防止超時重傳的發生。計算機仿真結果表明此方案具有良好的性能。
關 鍵 詞 傳送控制協議; 應答; 傳送控制協議代理; 報文段

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.
Key words transport control protocol; acknowledge; TCP agent; segment