An Enhanced TCP Vegas Algorithm Based on Route Surveillance and Bandwidth Estimation over GEO Satellite Networks

TCP Vegas is usually used in Space Communication Protocol Standard-Transport Protocol(SCPS-TP) and satellite networks due to its larger performance gain such as throughput, network utilization, stability, and packet-loss rate. However, the performance of TCP Vegas is inefficient in GEO satellite networks. The burst during slow-start phase causes Vegas to change from slow-start phase to congestion avoidance phase too early, and it also has disadvantage that can not distinguish link changing and congestion. In this paper, TCP Vegas-W is presented based on route surveillance and bandwidth estimation, and with surveillance of bandwidth and Round-Trip Time (RTT), congestion level is estimated much more correctly and precisely. Simulation results show that Vegas-W algorithm can get much better performance in GEO satellite networks.