Packet transmission system, packet transmission method, data reception system, and data reception method

摘要

A packet transmission system is provided which successively sends source data from a sender unit after dividing the data into packets and sends a receipt acknowledgment in response to each packet sent from a receiver unit that has received the receive packet to the sender unit. The receiver unit has: a data position storage unit storing the data position of the received, already received packet on the source data; a data position comparison unit comparing the data position on the source data stored in the data position storage unit and the data position of the receive packet on the source data; and a receipt acknowledgment creation unit creating the receipt acknowledgment in a case where the data position comparison unit determined that the data position of the receive packet on the source data is behind the data position on the source data stored in the data position storage unit.