Radio network system and radio apparatus

A radio network system to which a first radio apparatus that performs central control and a plurality of second radio apparatuses connected to the first radio apparatus by radio belong,

• wherein each of the plurality of second radio apparatuses comprises:
• a second receiving circuit configured to receive a first signal containing first identification information indicating a transmission source radio apparatus during a first reception period and to receive a second signal containing second identification information indicating a transmission source radio apparatus during a second reception period different from the first reception period;
• a measuring circuit configured to measure first reception information on reception of the first signal and to measure second reception information on reception of the second signal;
• a second condition determining circuit configured to, when the first identification information and the second identification information are the same, compares the first reception information and the second reception information to determine whether a radio apparatus in an abnormal condition is present;
• and
• a second transmitting circuit configured to transmit a determination result of the second condition determining circuit to the first radio apparatus,
• wherein the first radio apparatus includes:
• a first receiving circuit configured to receive the determination result from each of the plurality of second radio apparatuses;
• and
• a first condition determining circuit configured to determine whether a radio apparatus in an abnormal condition is present based on the determination results corresponding to the individual plurality of second radio apparatuses.

A radio apparatus being is a first radio apparatus that belongs to a radio network, the first radio apparatus comprising:

• a receiving circuit configured to receive a determination result indicating whether a radio apparatus in an abnormal condition is present from each of a plurality of second radio apparatuses that belongs to the radio network, wherein the determination result is obtained by each of the plurality of second radio apparatuses receiving a first signal containing first identification information indicating a transmission source radio apparatus during a first reception period, receiving a second signal containing second identification information indicating a transmission source radio apparatus during a second reception period different from the first reception period, measuring first reception information on reception of the first signal, measuring second reception information on reception of the second signal, and when the first identification information and the second identification information are identical to each other, comparing the first reception information and the second reception information to determine whether a radio apparatus in an abnormal condition is present;
• and
• a first condition determining circuit configured to determine whether a radio apparatus in an abnormal condition is present based on the determination result corresponding to each of the plurality of second radio apparatuses.