Patent ID: 7974184

Claim:
A radio network system which includes one control node for setting its own address into a control node address at the time of activating a network, a plurality of general nodes each for setting its own address on the basis of control by said control node when associating with the network and which makes multihop communication of radio data by using each of the addresses between the nodes, and at least one alternate control node that is substitutable for said control node, the alternate control node including: a control node monitoring component, which monitors an operating state in said control node; an operating state discriminating component, which discriminates whether or not said operating state is abnormal; and an upon-abnormality address setting component which sets its own address into said control node address when the operating state discriminating component determines that said operating state is abnormal, wherein as the monitoring of said operating state, said control node monitoring means monitors a communicating state of the radio data transmitted from said general node to said control node.