TCP-do: Enhancing TCP Performance with Delay Oscillation Frequency Analysis

As demand for ultra-high-speed Internet rises, the flaws in traditional congestion control methods based on packet loss are becoming clear. In wireless networks, packet loss often results from interference and collision, not actual congestion, causing inefficiencies. Delay-based congestion control algorithms which typically use round-trip time (RTT) as a key metric have been proposed to address these challenges. However, RTT alone cannot fully capture queuing delays, and small variations in delay measurements can cause significant fluctuations in the sending rate, leading to packet loss or inefficient link utilization. This study introduces TCP-do, a novel protocol that shifts the focus from static delay measurements to analyzing delay oscillation frequency. TCP-do monitors dynamic delay fluctuations and precisely adjusts the congestion window (cwnd), greatly enhancing delay-based congestion control especially in environments with frequent delay variations.