DATA COLLECTION SYSTEM AND WIRELESS TAG
First Claim
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1. A data collection system comprising:
- a plurality of wireless tags; and
a data collection device that performs time-division multiplexing communication with the plurality of wireless tags,the data collection device includinga collection device-side transmission unit that is provided on a gate or in the vicinity of the gate so as to transmit an LF signal in a low-frequency band (LF band) to the wireless tag,a collection device-side reception unit that receives a signal in a frequency band higher than the LF band transmitted from the wireless tag,a time information generator that generates time information representing time, anda time slot number information generator that generates time slot number information representing a time slot number which represents a time zone where data can be transmitted from the wireless tag to the data collection device,the wireless tag includinga tag-side transmission unit that transmits a signal in a frequency band higher than the LF band to the data collection device,a tag-side reception unit that receives an LF signal transmitted from the data collection device,a timer that performs time measurement, anda storage that stores information,wherein the data collection device transmits the time slot number information and time information representing a current time to the wireless tag using the collection device-side transmission unit when the wireless tag passes through the gate, andwherein the wireless tag receives the time slot number information and the time information using the tag-side reception unit, stores the time slot number information in the storage, corrects time measurement information of the timer based on the time information to cause the timer to perform time measurement, and transmits data to the data collection device using the tag-side transmission unit in a time zone corresponding to the time slot number.
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Abstract
A data collection system includes: a plurality of wireless tags; and a data collection device that performs time-division multiplexing communication with the plurality of wireless tags, the wireless tag including a tag-side transmission unit that transmits a signal in a frequency band higher than the LF band to the data collection device, a tag-side reception unit that receives an LF signal transmitted from the data collection device, a timer that performs time measurement, and a storage that stores information.
12 Citations
8 Claims
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1. A data collection system comprising:
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a plurality of wireless tags; and a data collection device that performs time-division multiplexing communication with the plurality of wireless tags, the data collection device including a collection device-side transmission unit that is provided on a gate or in the vicinity of the gate so as to transmit an LF signal in a low-frequency band (LF band) to the wireless tag, a collection device-side reception unit that receives a signal in a frequency band higher than the LF band transmitted from the wireless tag, a time information generator that generates time information representing time, and a time slot number information generator that generates time slot number information representing a time slot number which represents a time zone where data can be transmitted from the wireless tag to the data collection device, the wireless tag including a tag-side transmission unit that transmits a signal in a frequency band higher than the LF band to the data collection device, a tag-side reception unit that receives an LF signal transmitted from the data collection device, a timer that performs time measurement, and a storage that stores information, wherein the data collection device transmits the time slot number information and time information representing a current time to the wireless tag using the collection device-side transmission unit when the wireless tag passes through the gate, and wherein the wireless tag receives the time slot number information and the time information using the tag-side reception unit, stores the time slot number information in the storage, corrects time measurement information of the timer based on the time information to cause the timer to perform time measurement, and transmits data to the data collection device using the tag-side transmission unit in a time zone corresponding to the time slot number. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless tag that performs time-division multiplexing communication with a data collection device, comprising:
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a tag-side transmission unit that transmits a signal in a frequency band higher than a low-frequency (LF) band to the data collection device; a tag-side reception unit that receives an LF signal transmitted from the data collection device; a timer that performs time measurement; and a storage that stores information. - View Dependent Claims (8)
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Specification