Sensor node, base station, sensor network and sensing data transmission method
First Claim
Patent Images
1. A sensor node, comprising:
- a sensor which measures information at a predetermined interval;
a wireless communications part which transmits data measured by said sensor; and
a controller which controls said sensor and said wireless communication part,wherein said controller includes;
a clock part which starts said sensor at said predetermined interval;
a wireless communication state determining part which, when said sensor measures data, determines a suitable wireless communication state for transmitting a latest of the measurement data;
a storage part which, if the determined wireless communication state is not suitable for transmitting data, stores the latest of the measurement data; and
a data transmission part which, if the determined wireless communication state is suitable, transmits the stored latest of the measurement data.
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Abstract
To provide suppressing loss of sensing data while suppressing current consumption at a sensor node, a sensor node is started at a predetermined interval, a sensor measures data (P143), the measurement data is sent to a base station (P144), a state of wireless communication with the base station is determined (P145), and if the wireless communication state is not suitable for data transmission, the data is stored in a sensor node storage device (P147), whereas if the wireless communication state is suitable for data transmission, the data stored in the storage device is transmitted (P148).
83 Citations
15 Claims
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1. A sensor node, comprising:
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a sensor which measures information at a predetermined interval; a wireless communications part which transmits data measured by said sensor; and a controller which controls said sensor and said wireless communication part, wherein said controller includes; a clock part which starts said sensor at said predetermined interval; a wireless communication state determining part which, when said sensor measures data, determines a suitable wireless communication state for transmitting a latest of the measurement data; a storage part which, if the determined wireless communication state is not suitable for transmitting data, stores the latest of the measurement data; and a data transmission part which, if the determined wireless communication state is suitable, transmits the stored latest of the measurement data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A base station comprising:
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a wireless communication part which measures data at a predetermined interval, and that transmits to and receives from a sensor node data indicating measurements and a measurement time; a database which stores the data received from said sensor node; and a controller which controls said wireless communication part and the database, wherein said controller includes; a responder which transmits a reply signal to said sensor node when the data is received from said sensor node; a data extraction part which extracts the measurement data and the time data from said received data; a sort part which rearranges said measurement data correspondent to said time data; and a data accumulating part which stores pairs of said rearranged measurement data and said measurement time data in said database. - View Dependent Claims (12)
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13. A sensor network comprising:
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a sensor which measures data at a predetermined interval; a first wireless communication part which transmits the data measured by said sensor to a base station; a first controller which controls said sensor and said first wireless communication part; a sensor node comprising said first controller and said first wireless communication part; a second wireless communication part which transmits and receives data to and from said sensor node; a database which stores the data received from said sensor node; and a base station comprising a second controller which controls said second wireless communication part and said database; wherein the first controller includes; a clock part which starts said sensor at said predetermined interval; a wireless communication state determining part which, when said sensor measures the latest data, determines a wireless communication state by transmitting the latest data; a storage part which, if the determined wireless communication state is a state which is not suitable for transmitting data, stores said latest measurement data; and a data transmission part which, if the determined wireless communication state is a state which is suitable for transmitting data, transmits said data stored in said storage part; and wherein the second controller includes; a responder which transmits a reply signal to the sensor node when the data is received from said sensor node; and wherein said wireless communication state determining part determines a wireless communication state with the base station based regarding whether said reply signal was received.
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14. A method of transmitting sensing data transmitted by a sensor node having a sensor which measures data at a predetermined interval, to a base station, comprising:
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starting said sensor at a predetermined interval; allowing said sensor to transmit a latest of the measurement data to said base station when the sensor measures the latest data; determining a state of wireless communication with said base station regarding suitability for transmission of said latest data; storing said measurement data in a storage device of the sensor node if said determined wireless communication state is a state which is not suitable for transmitting data; and transmitting said data stored in said storage device if said determined wireless communication state is a state which is suitable for transmitting data. - View Dependent Claims (15)
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Specification