A TCP congestion control method for securing stable throughput

The important communications or real time applications over IP networks such as the Internet have received considerable attention over recent years. However, it is very difficult for the standard TCP to maintain QoS (i.e. bandwidth) which is demanded by important communications or real time applications, when multiple TCP connections share the bandwidth of a bottleneck link. Thus, it is useful for stable communication to secure bandwidth for such applications. Several TCP congestion control methods which maintain a target bandwidth at end hosts have been proposed. However, these methods become unstable when there are many background TCP connections or multiple TCP connections which try to secure bandwidth. Therefore, this paper proposes a TCP congestion control method for achieving predictable stable throughput by decreasing a target bandwidth dynamically, when there are many back ground TCP connections or multiple TCP connections which try to secure bandwidth. Simulation results show that the proposed method can maintain throughput more stably than existing methods in heavy network congestion.