| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a data communication method that applies error control to missing packets for a wired line block without deteriorating a communication efficiency by retransmitting communication data to a repeating installation, when a reception success notice is not received before the lapse of a prescribed time. SOLUTION: An error control means 13 stores contents of a communication packet that is sent once to a storage means 15 as unconfirmed transmission packet information. Upon the receipt of a reception success notice of a communication packet generated by an error control means 22 provided in the repeating installation 2, the control means 13 deletes the contents of a communication packet stored as the unconfirmed transmission packet information in the storage means 15. However, when the reception success notice of the communication packet is not received before a prescribed time elapses after transmission of the communication packet, a communication packet is generated again based on a packet error history of a radio communication channel 4 stored in the storage means 15 again, and the control means 13 requests transmission of the communication packet to a physical interface control means 14.</p> |
