Patent ID: 8159945

Claim:
A sensor network system, comprising: a sensor node which transmits obtained information as an event; and a relay node which receives the event and transfers the event toward a server computer, wherein the relay node includes: a limit transfer rate judging unit which judges whether or not a transfer rate of the event is higher than a limit transfer rate set in advance; an excess transmission rate node identifying unit which identifies, when the limit transfer rate judging unit judges that the transfer rate is higher than the limit transfer rate, as an excess transmission rate node, a sensor node connected to the relay node and having an event transmission rate that meets a preset condition; a deceleration node selecting unit which chooses, as a deceleration node, a sensor node whose transmission rate should be reduced, the deceleration node selecting unit choosing one of the excess transmission rate node and other sensor nodes than the excess transmission rate node; a deceleration processing executing node selecting unit which chooses, as a deceleration processing executing node, one of the deceleration node and a relay node that is connected to the deceleration node; and a deceleration initiating unit which instructs the deceleration processing executing node to execute processing specified in accordance with a preset deceleration processing rule.