Measurements on Fairness and Friendliness of TCP Westwood in Wireless Environments

Abstract — TCP Westwood (TCPW) is a TCP protocol relying on a continuous estimation by the sender of the packet rate of the connection based on the ACK reception rate. And this in order to compute congestion window and slow start threshold settings after a congestion period in the network. It has been yet established through experimental studies that TCPW exhibits significant improvements in throughput performance over Reno on the Internet. As far as the wireless environments are concerned, all the performance studies have been achieved by simulation means. Hence, we are presenting in this paper the results of experimentations carried out to perform a series of measurements on TCPW performance with respect to fairness and friendliness towards TCP New Reno. All of these experimentations are achieved in the CRSITAL Laboratory with a FreeBSD TCPW ABSE protocol implementation