| 摘要 |
PURPOSE:To reduce the communication time by assigning a signal of a code form whose pulse location is a prime to plural communication equipments respectively in advance and providing a means identifying the signal to each communication equipment so as to attain the simultaneous return of a transmission right request reply signal and a transmission confirmation reply signal from the communication equipments. CONSTITUTION:A code form whose pulse location is a prime to each communication equipment is assigned in advance as a reply signal. When the communication equipment, e.g., 1-1 sends an inquiry signal in terms of broadcast to other communication equipments 1-2-1-m in order to check the presence of a transmission request, the communication equipment having a broadcast request among the communication equipments receiving the inquiry signal sends a reply signal of a code form assigned to itself. For example, the communication equipment 1-j sends repetitively a signal Sj having O at each Pj-bit as the reply signal. The reply signal sent from each communication equipment is ORed by a communication network 2 and the result reaches the equipment 1-1. The equipment 1-1 receives the ORed reply signal and uses it that the pulse locations are a prime to each other so as to identify from which communication equipment the reply signal comes.
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