Patent ID: 8897200

Claim:
A relay system comprising a plurality of relay devices which are connected to one another through a single communication line and in which the relay devices operate within a single communication area, and to which respective unique relay channels are allocated, wherein the unique relay channels are predetermined independent of time and facilitate communication between wireless terminal devices, and wherein each relay device is configured to wirelessly transmit control information generated based on information obtained from the single communication line to a wireless terminal device in order to select a relay channel for the wireless terminal device registered in the own relay device to communicate with an other wireless terminal device, wherein the plurality of relay devices comprise a master relay device which transmits a synchronization signal over the single communication line and which communicates with the single communication line in synchronization with the synchronization signal, and an other slave relay device which obtains the synchronization signal through the single communication line and which communicates with the single communication line in synchronization with the synchronization signal, and when each of the relay devices detects a condition in which no synchronization signal is transmitted over the single communication line, a relay device starts transmitting a synchronization signal in accordance with a predetermined rule, and the relay device which has transmitted the synchronization signal serves as the master relay device.