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Streaming video has become a popular form of transferring video over wireless networks. TCP-friendly rate control (TFRC) is used as a streaming video transport protocol. Using both TCP congestion response function and current network conditions, TFRC adjusts its sending rate to yield the maximum TCP-friendly throughput. Since TFRC was designed for applications that would prefer to maintain a slowly-changing sending rate, it is less responsive to changes in handover between next-generation wireless overlay network. This paper shows a new TFRC method for vertical handover (VHO) over wireless overlay network. The proposed TFRC method uses explicit VHO messages for faster rate adaptation to a new target network. The simulation results show that the proposed one provides better QoS and throughput supports than the conventional TFRC scheme during VHO.