Smooth slow-start: Refining TCP slow-start for large-bandwidth with long-delay networks

Transmission Control Protocol (TCP) adopts some techniques that use network resource efficiently by estimating the characteristic and condition of network. Slow-start algorithm is the primary technique for effective resource usage. The goal of slow-start is to establish TCP connection in optimum state for network path quickly unless giving an excessive load to the network. However, in the large-bandwidth with long-delay links such as satellite links, slow-start algorithm does not work properly and causes substantial performance degradation. In this paper, we describe the problem of current slow-start algorithm in large-bandwidth with long-delay networks. We propose new slow-start algorithm that can increase network transfer performance for large bandwidth with long delay networks. We also implemented this algorithm on a network simulator for evaluation and resulted over 60% efficiency compared to a normal slow start algorithm.