Abstract: To improve the performances ofTCP (transfer control protocol) in mobile environments, an end- to-end solutionwas proposed based on ROMIPv4 (route optimization in mobile internet protocal version 4), which is named as TCP-BROMIPv4. In this solution, sender TCP may adjust its operation when it is switching to a new node if it receives a binding update message and a handoffwarning message. Simulation results show that TCP-BROMIPv4 shortens the traffic interrupted time and increases the number of packets transfered, greatly raises the throughput ofTCP in mobile networks .