Wireless sensor-network system, sensing terminal node, and base station
First Claim
1. 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.
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Accused Products
Abstract
To correct a sensor data acquisition time with a simple hardware configuration, provided is a wireless sensor-network system including: a base station; and a plurality of sensing terminal nodes, the base station transmitting a beacon at predetermined intervals to the plurality of sensing terminal nodes, the plurality of sensing terminal nodes measuring data and transmitting, based on a reception of the beacon transmitted from the base station, the sensor data thus obtained to the base station, in which the plurality of sensing terminal nodes obtain, based on an internal clock, a time at which the beacon is received and transmit the time to the base station, and the base station corrects, based on the reception time transmitted from each of the plurality of sensing terminal nodes, the sensor data acquisition time.
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Citations
17 Claims
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1. A wireless sensor-network system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A sensing terminal node for measuring data, which is connected to a base station, the base station transmitting a beacon at predetermined timing,
the sensing terminal node transmitting, according to the beacon that has been transmitted from the base station, the measured data to the base station, the sensing terminal node including: - a sensor for measuring predetermined data;
a transmission and reception unit for transmitting and receiving a signal to and from the base station;
a control unit for controlling acquisition of the data measured by the sensor and transmission of the obtained data;
a clock unit and a counter unit for counting a clock generated by the clock unit,wherein; 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 control unit associates a counter value counted by the counter unit with the reception time of the beacon. - View Dependent Claims (9, 10)
- a sensor for measuring predetermined data;
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11. A sensing terminal node for measuring data, which is connected to a base station, the base station transmitting a beacon at predetermined timing,
the sensing terminal node transmitting, according to the beacon that has been transmitted from the base station, the measured data to the base station, the sensing terminal node including: - 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;
a storage unit for storing the obtained data, wherein;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; the control unit stores a plurality of packets including the reception time of the beacon and the obtained data, in the storage unit; the transmission and reception unit transmits the plurality of stored packets to the base station; and the control unit retransmits, when the transmission of the plurality of packets fails, the plurality of packets stored in the storage unit, to the base station. - View Dependent Claims (12)
- a sensor for measuring predetermined data;
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13. A sensing terminal node for measuring data, which is connected to a base station, the base station transmitting a beacon at predetermined timing, wherein:
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the sensing terminal node transmitting, according to the beacon that has been transmitted from the base station, the measured data to the base station, the sensing terminal node including;
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, wherein;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; the control unit of the sensing terminal node divides a sequence of the obtained data into data segments in predetermined units, and stores, of the data segments, data segments adjacent to each other in different packets; and the transmission and reception unit transmits the packet in which the data segment is stored, to the base station.
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14. A base station connected to a plurality of sensing terminal nodes for measuring data;
- wherein;
the base station transmits a beacon at predetermined timing; 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 transmit, according to the beacon that has been transmitted from the base station, the measured data to the base station; and the base station receives a reception time of the beacon and the obtained data, from 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. - View Dependent Claims (15, 16, 17)
- wherein;
Specification