| 摘要 |
<p>PURPOSE:To perform the transmission of information with high reliability by classifying the equipments having the transmission terminals into a plural number of emergency levels and then transmitting again the information based on these set levels. CONSTITUTION:A household communication system includes plural equipments having the transmission terminals and these equipments are classified into four emergency levels 1-4 in order of higher emergency. The equipment of level 1 has a receiver and requests the return of a confirmation signal to repeat the retransmission of information until the confirmation signal is received. The equipment of level 2 repeats the retransmission of information in the frequency higher than a level where at least the packet collision probability is equal to a prescribed level. The retransmission frequency is limited to the equipment of level 3, and the retransmission of information is carried out at random time intervals. The retransmission of information is not performed with the equipment of level 4. In such a constitution, the communication probability is improved at each level and also among the levels. Then the reliability is extremely improved for the transmission of information.</p> |
