Abstract: In the wireless environment, the method of bandwidth estimation for TCP based on channel noise model(Ntcp) has two disadvantages, one is the low estimated bandwidth and the other is the high fluctuation of the estimated bandwidth. With that, we proposed an improved algorithm(Ntcp' ) based on the amount of data sent by the sender.The analysis and simulated results show that Ntcp' works well.

Key words: Congestion control,Bandwidth estimated, Wireless network, TCP