A Method to Alleviate Unfairness Between HSTCP Flows with Different RTT
High-speed TCP (HSTCP) is a protocol that is proposed to take advantage of high capacity bandwidth of backbone network links. HSTCP is able to effectively support the large scale congestion window as compared to Reno TCP. HSTCP is a promising protocol that is getting most attention because it can accommodate existing regular TCP in network and can implement easily by modifying only sender side of TCP transmission protocol. However, HSTCP does not reflect the property of RTT in parameters that increase the congestion window as Reno does. Consequently, the flows experience the serious unfairness when they compete to get the limited resource of network. Especially, the problem appears severely as RTT ratio between the flows grows larger. Therefore, this paper proposes F-HSTCP as a new protocol that reflects the property of RTT as well as current window size in AIMD parameters. This paper also shows that F-HSTCP can resolve the unfairness problem through simulations. F-HSTCP can embrace the difference of RTT.
KeywordsCongestion Control Congestion Window Bottleneck Link Unfairness Problem Congestion Window Size
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