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The traditional TCP was designed for wired network; implementing TCP protocol in wireless network may lead inaccuracy prediction and will results suffer performance degradation in network. A proposed TCP-Hybrid congestion mechanism is presented in this article to address the issues by improving TCP performance in wireless environments such as a mobile WiMAX. The model adapted the existing TCP congestion control which is based on TCP-Vegas and adopting a modification Scalable TCP aggressive rule to increase a window size. The experiment results have shown that while all TCP variants produces similar throughput, window size and round trip time, even they do in different ways. But however our propose mechanism has proven 1.3% to 3% more better throughput compared to TCP-Vegas and TCP-Scalable and also high window size contributed mechanism.