| 摘要 |
<p>PROBLEM TO BE SOLVED: To attain relay radio communication with high reliability against a communication fault by generating plural transmission data packets for relaying to a next stage with no error data integrated to them, transmitting the packets continuously to a radio relay station or a radio reception station, and allowing the station to select the no error data and to use the data as reception data. SOLUTION: In the case of receiving a 1st packet 1/4 among four data packets sent continuously from a master M, the station S1 receives a total consecutive transmission number 4 and a transmission sequence number 1 written in the packet, sets a time required to receive three succeeding packets to a reception watchdog timer of its own station and starts the timer. In the case that the data packets 2/4,3/4 are received but the packet 4/4 does not reach due to a communication fault, when the received data packets 2/4 and 3/4 are normal, the station S1 integrates them to generate transmission data packets 1/4-4/4 for relay to a next stage, sends the packets to a next stage radio reception station S3. The station S3 sets the time to its reception watchdog timer similarly to the case with the station S1 corresponding to the normal data and receives the data. Thus, the transmission efficiency is enhanced by revising the time setting in this way.</p> |
