A CMT congestion window updates mechanism based on TCP Westwood

TCP Westwood is an enhancement algorithm using the ACK estimated available bandwidth. CMT based on the SCTP use the radical Reno mechanism to update congestion window control and it leads to frequently retransmit the packets. Through the study of TCP Westwood, basing on CMT retransmission mechanism and cwnd update policy, this paper put forward a new policy, which can estimate the bandwidth, update the cwnd and transmit the data packets efficiently on bottleneck bandwidth. NS2 simulation showed the improvements of the throughput and packet loss rate.