Patent ID: 8289992

Claim:
A wireless sensor-network system, comprising: a base station; and a plurality of sensing terminal nodes, the base station transmitting a beacon at predetermined timing to the plurality of sensing terminal nodes, the plurality of sensing terminal nodes measuring data and transmitting, according to the beacon that has been transmitted from the base station, the measured data to the base station, wherein: the plurality of sensing terminal nodes comprise a first sensing terminal node serving as a reference and a second sensing terminal node other than the first sensing terminal node; the plurality of sensing terminal nodes each comprise: a sensor for measuring predetermined data; a transmission and reception unit for transmitting and receiving a signal to and from the base station; and a control unit for controlling acquisition of the data measured by the sensor and transmission of the obtained data; the control unit obtains a time at which the beacon is received; the transmission and reception unit transmits the reception time of the beacon and the obtained data, to the base station; and the base station receives the reception time of the beacon and the obtained data in each of the plurality of sensing terminal nodes, and corrects an acquisition time of the data, based on a relative relation between the beacon reception time received from the first sensing terminal node and the beacon reception time received from the second sensing terminal node.