Abstract: Aimming at the dramatic change of round trip delay caused by high dynamic changes of satellite network’s communication path and the alignment precision degradation when TCPW is used in long-delay network,a advanced TCPW algorithm named TCPW-CC was proposed,which uses the congestion coefficient of satellites as the adjusted basis of congestion windows.The new algorithm is able to avoid the influence of transmitting delay of space link.At the same time,the window adjustability is changed to be done after each RTT,which used to happen after dropping,thus resulting in that window grows less aggressive than the original.The results of simulation indicate that the TCPW-CC obviously improves the system throughput,decreases the rate of lost packets.

Key words: Satellite network,Congestion control,Congestion coefficient,TCPW