DATA TRANSFER METHOD FOR EFFICIENTLY TRANSFERRING BULK DATA

摘要

[Problem] To provide a means that enables consistent high performance data transfer between different data communication devices via a network, with no compounding of network congestion. [Solution] In the present invention, a receiving side data communication device (12) calculates, at prescribed times, an actual measured RTT, which is the time required for data to travel to a transmission side data communication device (11) and back, a data transfer rate (R) for the data transfer, and a data loss ratio (L), which is the ratio of the number of packets not received by the receiving side data communication device (12) to the number of packets sent from the transmission side data communication device (11). The receiving side data communication device (12) uses the most recent data transfer rate (R) and the data loss ratio (L) to calculate a transfer score (S) according to a prescribed calculation formula, and increases or decreases the reference RTT in accordance with the change in the transfer score (S). The receiving side data communication device (12) gives instructions to the transmission side data communication device (11) to increase or decrease the data transfer rate in accordance with the results of a comparison of the reference RTT and the actual measured RTT.