Information collection system and method

An information collection method to be executed in an information collection system which collects sensor data and/or an abnormal value determination result of the sensor data from a plurality of sensors installed in a structure,

• wherein:
• the information collection system includes a receiver, which is mounted on a travel vehicle that travels along a given route, which receives the sensor data transmitted from the sensors positioned on the route;
• the information collection method comprises:
• a first step of each of the sensors not positioned on the route travelled by the travel vehicle transmitting, to the sensors of a subsequent stage in multihop wireless communication preset so that the sensor data and/or the abnormal value determination result is aggregated in a predetermined sensor positioned on the route travelled by the travel vehicle, the sensor data and/or the abnormal value determination result transmitted from the sensors of a preceding stage in the multihop wireless communication, as well as its own sensor data and abnormal value determination result;
• and
• a second step of the sensor positioned on the route travelled by the travel vehicle transmitting the aggregated sensor data and/or abnormal value determination result to the receiver;
• and
• in the first step, during an abnormal condition where an abnormality is detected in the abnormal value determination, each of the sensors not positioned on the route travelled by the travel vehicle switches a transmission destination of the sensor data and/or the abnormal value determination result to one of the sensors in a multihop network which aggregates the sensor data and/or the abnormal value determination result in the sensor positioned on the route having a higher travel frequency of the travel vehicle than the route on which the sensor of an aggregation destination of the sensor data and/or the abnormal value determination result is positioned during a normal condition where an abnormality is not detected in the abnormal value determination.