Sensor node and sensor network system
First Claim
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1. A sensor node comprising:
- a sensor for measuring biological information;
a control unit for acquiring data by driving the sensor, the data including an acceleration value;
a wireless communication unit for transmitting the data acquired by the control unit;
a battery for supplying the control unit, the wireless communication unit, and the sensor with electric power;
a volatile storage unit for storing the data;
a compression unit for compressing the data stored in the volatile storage unit when the wireless communication unit cannot carry out the transmission if and only if the acceleration value included in the data is less than or equal to a predetermined value, the compression unit comprising a difference representation conversion unit for converting the data into differences between the data and an encoding unit for converting a first difference that is smaller than a second difference into a shorter length code than that of the second difference; and
a non-volatile storage unit for storing the compressed data.
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Abstract
Provided is a sensor node including: a sensor for measuring biological information; a CPU for acquiring data by driving the sensor; a wireless communication unit for transmitting the data acquired by the CPU; a battery for supplying the control unit, the wireless communication unit, and the sensor with electric power; a RAM for storing the data; a compression unit for compressing the data stored in the RAM when the wireless communication unit cannot carry out the transmission; and a flash memory for storing the compressed data, thereby storing as much sensing data as possible on the sensor node, which is limited in resources, and preventing loss of the sensing data.
22 Citations
15 Claims
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1. A sensor node comprising:
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a sensor for measuring biological information; a control unit for acquiring data by driving the sensor, the data including an acceleration value; a wireless communication unit for transmitting the data acquired by the control unit; a battery for supplying the control unit, the wireless communication unit, and the sensor with electric power; a volatile storage unit for storing the data; a compression unit for compressing the data stored in the volatile storage unit when the wireless communication unit cannot carry out the transmission if and only if the acceleration value included in the data is less than or equal to a predetermined value, the compression unit comprising a difference representation conversion unit for converting the data into differences between the data and an encoding unit for converting a first difference that is smaller than a second difference into a shorter length code than that of the second difference; and a non-volatile storage unit for storing the compressed data. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A sensor network system comprising:
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a sensor node for transmitting data measured by a sensor for measuring biological information, the data including an acceleration value; and a relaying apparatus for receiving the data and transferring the received data to a server computer, wherein; the sensor node comprises; a control unit for acquiring data by driving the sensor; a wireless communication unit for transmitting the data acquired by the control unit; a battery for supplying the control unit, the wireless communication unit, and the sensor with electric power; a volatile storage unit for storing the data; a compression unit for compressing the data stored in the volatile storage unit when the wireless communication unit cannot carry out the transmission if and only if the acceleration value included in the data is less than or equal to a predetermined value, the compression unit comprising a difference representation conversion unit for converting the data into differences between the data and an encoding unit for converting a first difference that is smaller than a second difference into a shorter length code than that of the second difference; and a non-volatile storage unit for storing the compressed data; and the relaying apparatus comprises; a wireless communication unit for communicating with the sensor node; a decoding unit for decoding the data received from the sensor node; and a network communication unit for transmitting the decoded data to the server computer. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A sensor network system comprising:
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a sensor node for transmitting data measured by a sensor for measuring biological information, the data including an acceleration value; and a relaying apparatus for receiving the data and transferring the received data to a server computer, wherein; the sensor node comprises; a control unit for acquiring data by driving the sensor; a wireless communication unit for transmitting the data acquired by the control unit; a battery for supplying the control unit, the wireless communication unit, and the sensor with electric power; a volatile storage unit for storing the data; a compression unit for compressing the data stored in the volatile storage unit when the wireless communication unit cannot carry out the transmission if and only if the acceleration value included in the data is less than or equal to a predetermined value, the compression unit comprising a difference representation conversion unit for converting the data into differences between the data and an encoding unit for converting a first difference that is smaller than a second difference into a shorter length code than that of the second difference; and a non-volatile storage unit for storing the compressed data; the relaying apparatus comprises; a wireless communication unit for communicating with the sensor node; and a network communication unit for transmitting the data received from the sensor node to the server computer; and the server computer comprises; a communication unit for communicating with the relaying apparatus; a decoding unit for decoding the data received from the relaying apparatus; and a data storage unit for storing the decoded data. - View Dependent Claims (14, 15)
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Specification