Abstract:

The sending window size of transport control protocol (TCP) is decided by the minor value between congestion window and receiver’s affirmance window. In a high-speed network, the TCP performance can be improved by increasing the congestion window properly. However, a smaller receiver’s affirmance window will limit the increase of the sending window. The limitation can be reduced by increasing, appropriately, the credit admitted by the receiver’s affirmance window according to the data variational rate in TCP receiver. An enhanced TCP scheme named RCA-TCP (receiver credit adjustment transport control protocol) is proposed, which obtains credit increments according to the estimated product of the dynamic data variational rate in TCP receiver’s buffer and the minimal roundtrip time of the TCP connection. Simulation on ns-2(network simulator, version 2) shows that the scheme can get better performance.