Ad hoc sensor networks
First Claim
1. A sensor device comprising:
- means for periodically generating a measured value of a property;
means for determining the rate of change in the measured property;
means for determining the values of the property being measured by devices similar to said sensor device; and
means for adjusting the periodicity of measurement according to the values the sensor device has measured and the measured values received from the devices similar to said sensor device.
1 Assignment
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Accused Products
Abstract
A plurality of mobile sensor devices each periodically measure a property of their environment, and determine the rate of change in that property. Neighboring devices also co-operate to determine the values of the property being measured by each other. If the property is invariant both over time and over a number of neighboring devices, their periodicity of measurement-taking is reduced to conserve power for more significant measurement events. The devices may co-operate to relay their measurements to a data collection point. Each device determines the level of data traffic being carried by one or more neighboring devices, identifies the device that is carrying the least traffic, and puts itself under the control of that device. Any device that determines that it is carrying less such traffic than any of its neighbor assumes control of the data sensing rate for itself and those neighbor, and transmits control data to the said other devices to co-ordinate their data collection rates and stagger their data collection times.
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Citations
20 Claims
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1. A sensor device comprising:
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means for periodically generating a measured value of a property; means for determining the rate of change in the measured property; means for determining the values of the property being measured by devices similar to said sensor device; and means for adjusting the periodicity of measurement according to the values the sensor device has measured and the measured values received from the devices similar to said sensor device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 19)
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10. A method of operating a plurality of sensor devices, said method comprising:
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periodically measuring a property at each of plural sensor devices, determining the rate of change at each device in the measured property, transmitting the values of the property being measured by each device from each device to one or more other devices, and adjusting the periodicity of measurement of each device according to the values it has measured and the values it has received from the one or more other devices. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 20)
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Specification