Radio communication system, location registration method, repeater, and radio client device

A location registration method conducted by a radio communication system comprising

• a plurality of repeaters connected to each other via communication lines, each allocated with a unique channel, and
• a plurality of radio client devices that communicate with each other via at least one of the plurality of repeaters,
• wherein a plurality of communication areas are formed in which each of the plurality of radio client devices is capable of receiving a signal transmitted by multiple repeaters from among the plurality of repeaters in each communication area, and
• in each communication area, at least one predetermined repeater transmits a usage condition signal in a case where a channel allocated to the predetermined repeater is usable for communication,
• the location registration method comprising:
• each of the plurality of radio client devices conducting a location registration requesting step of scanning a channel allocated to the predetermined repeater, and in a case of receiving, on the channel, the usage condition signal that matches a predetermined reference, transmitting a request for location registration to the predetermined repeater;
• and
• the repeater conducting a location registering step of, in a case of receiving a request for location registration from one of the plurality of radio client devices, conducting location registration for the radio client device, transmitting information about the radio client device whose location is registered to a predetermined repeater in a communication area of the repeater or to a predetermined repeater in a different communication area, and in a case of receiving information about a radio client device whose location is registered from another repeater in the communication area of the repeater, transmitting information about the radio client device whose location is registered to the predetermined repeater in the different communication area.

A radio client device that communicates with another radio client device via at least one of a plurality of repeaters that are connected to each other via communication lines and are each allocated with a unique channel,

• wherein a communication area is formed in which the radio client device is capable of receiving a signal transmitted by multiple repeaters from among the plurality of repeaters, and in a case where there exists, in the communication area, a main repeater, being a predetermined repeater that transmits a usage condition signal in a case where an allocated channel is usable for communication, and a sub-repeater, being a repeater that is not the main repeater,
• the radio client device comprising:
• a scanner that scans a channel allocated to the main repeater;
• and
• a transmitter that, in a case of receiving the usage condition signal, transmits a request for location registration to the main repeater,
• wherein, in a case where the main repeater is in an unusable state and there is another main repeater or the sub-repeater in the communication area, the scanner additionally scans a channel allocated to the other main repeater or the sub-repeater, and in a case of detecting another usable repeater thereby, the transmitter transmits a request for location registration to the other usable repeater.