RADIO NETWORK SYSTEM

PROBLEM TO BE SOLVED: To provide a radio network system for highly precisely executing time synchronization even when the period of a frame is long (transmission speed of the frame is low). SOLUTION: In the radio network system 10, a trunk device 12 and radio devices 16a-16c each have counters 20, 22a-22c respectively, the counters 20, 22a-22c each execute a counting operation at a time interval shorter than a time of a frame or a time of a slot in which packets are transmitted and received between the trunk device 12 and the radio devices 16a, 16b or between the radio devices 16a and 16c, and the trunk device 12 and the radio devices 16a-16c each set a count value indicating an elapsed time from the start time of the frame counted by the respective own counters 20, 22a-22c in a packet and broadcasts the set packet using the slot. COPYRIGHT: (C)2011,JPO&INPIT