| 摘要 |
PROBLEM TO BE SOLVED: To reduce processing time by efficiently and reliably transmitting and receiving a file in a proper band. SOLUTION: A file receiver 2 transmits a synchronization packet including a transmission request block number and acknowledgement (block number, start packet number and end packet number of received data packet) to a file transmitter 1 after securing a predetermined area in a receiving buffer 207. The file transmitter 1 receives the synchronization packet, packetizes the data of the transmission request block, and transmits the data packet to the file receiver 2. The file transmitter 1 also compares the acknowledgement with the block number and the packet number of a data packet that has already been transmitted, detects a packet loss and retransmits the data packet in which a loss occurs, to the file receiver 2. Consequently, data can reliably be transmitted and received without congestion control. In addition, data requested by the file receiver 2 can efficiently be transmitted and received without narrowing a frequency band. COPYRIGHT: (C)2011,JPO&INPIT
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