A novel bandwidth estimation algorithm of TCP westwood in typical LTE scenarios

With the popularity of the wireless network, people are in urgent need of high efficiency transmission. As for the TCP layer, how to transmit the information with guidance rises to an important level. TCP Westwood (TCPW) is a sender-side modification of the TCP congestion control algorithm by estimating the available bandwidth. However, TCP Westwood usually overestimates the allocated bandwidth when there are more than two TCP flows competing the bottleneck link, which may cause earlier congestion and unnecessary retransmission even the transmission is timeout. In this paper, we propose a novel algorithm called TCPW with Holt-Winters (TCPWH) to estimate the bandwidth accurately by introducing the Holt-Winters forecasting model into the TCP Westwood. The result of the simulations in typical Long Term Evolution (LTE) scenarios shows that TCPWH improves the performance on bandwidth estimation, throughput and fairness compared with TCPW.