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Previous marking policy for the AF service of TCP traffic in the Diffserv network has no sufficient consideration on the effect of RTT and target rate of TCP connections. In this paper, in order to improve fairness index of TCP flows, the authors propose the TSW3CDM-FS (Time Sliding Window Three Color Dynamic Marker with Flow Status) based on average transfer rate estimation. The proposed algorithm is based on dynamic marking policy that allocates band-width in proportion to transmission rate of flows. They implement the proposed marking policy and evaluate the performance of the proposed marking policy by a computer simulation using NS2. From simulation results, the TSW3CDM-FS algorithm improves fairness index by comparison with TSW3CM.
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