Compound TCP+ for fairness improvement among Compound TCP connections in a wireless LAN

Abstract

In high-speed and long-distance networks, TCP NewReno, which is the most popular version of TCP, cannot achieve sufficient throughput because of the essential nature of the congestion control mechanism of TCP. Therefore, Compound TCP has been proposed. Compound TCP can achieve a considerably larger throughput than TCP NewReno in high-speed and long-distance networks. The congestion control mechanism of Compound TCP consists of loss-based and delay-based congestion controls. On the other hand, in a wireless LAN, the throughput among TCP connections becomes unfair because of the media access control used in a wireless LAN. Since Compound TCP has the same type of congestion control as TCP, it is expected that the same problem will occur among Compound TCP connections. In this papyer, we evaluate the performance of Compound TCP over a wireless LAN and show that the throughput among Compound TCP connections becomes unfair. Then, we propose Compound TCP+, which solves this problem, and show by simulation that Compound TCP+ connections share the bandwidth equally.