unstable networks

With the rapid development of network, multimedia is largely applied in several areas, and it needs high bandwidth for network to transmit multimedia. At present UDP is always applied as lower layer for transmitting multimedia because it has high-speed transfer rate. However, UDP loses more packets under the condition of insufficient network bandwidth. Therefore in this paper we add the controller to improve the UDP. The proposed protocol maintains the high-speed transfer rate, and solves the problem of packets loss. We demonstrate that the proposed protocol is more efficient than traditional UDP by NS-2