MULTIPLE ACCESS COMMUNICATING SYSTEM

PURPOSE:To shorten transmission delay time per message by including the number of slots to be reserved in a next frame or after in the first packet and reserving a time slot according to the success of the transmission. CONSTITUTION:A reservation managing part 16 determines the assignment of the time slot for a self station and other station in the next frame according to a prescribed algorithm from a frame synchronizing signal and a signal to indicate whether received respective slots are empty, the transmission succeeds, or the transmission fails from a receiving part 21, another signal to indicate whether the above-mentioned packet is for the self station or for other station from a packet decomposing part 20, and the number of reserved time slots included in the above-mentioned packet and stores the assignment. Further, the managing part 16 returns the information of the time slot assigned to either the self station or other station to an access control part according to the inquiry of the access control part 17. Thus, the transmission delay time per message can be shortened.