RFID SYSTEM AND RADIO APPARATUS
First Claim
1. An RFID system, comprising:
- a mobile radio apparatus; and
a reference radio apparatus configured for radio communication with the mobile radio apparatus, the reference radio apparatus including;
a first memory,a first timing generation section that measures time,a first transmission section that transmits an information-request signal requesting transmission of identification information of the mobile radio apparatus in a first period and that transmits an unmodulated-carrier-wave request signal requesting transmission of an unmodulated carrier wave to be used for positioning the mobile radio apparatus in a second period,a first receiving section that receives a response signal carrying the identification information, that receives the unmodulated carrier wave in a third period determined by time-period data stored in the first memory in accordance with timing from the first timing generation section, and that detects a phase difference of the unmodulated carrier wave, anda first control section that outputs the received identification information, that generates data indicating the detected phase difference of the unmodulated carrier wave, and that outputs the data; and
the mobile radio apparatus including;
a second memory that stores the identification information of the mobile radio apparatus,a second timing generation section that measures time,a second receiving section that receives the information-request signal and that receives the unmodulated carrier wave, anda second transmission section that transmits a response signal carrying the identification information in the second memory in response to receiving the information-request signal, and that transmits the unmodulated carrier wave in the third period determined by time period data stored in the second memory in accordance with timing from the second timing generation section in response to receiving the unmodulated-carrier-wave request signal.
1 Assignment
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Accused Products
Abstract
A radio apparatus capable of being used in an RFID system, the apparatus having a memory that stores identification information of the radio apparatus, a timing generation section that measures time, a receiving section that receives an information-request signal requesting transmission of the identification information of the radio apparatus, and that receives an unmodulated-carrier-wave request signal requesting transmission of an unmodulated carrier wave to be used for positioning the radio apparatus; and a transmission section that transmits a response signal carrying the identification information in the memory in response to receiving of the information-request signal, and that transmits the unmodulated carrier wave in an unmodulated-carrier transmission period determined by time period data stored in the memory in accordance with timing from the timing generation section in response to receiving of the unmodulated-carrier-wave request signal.
21 Citations
12 Claims
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1. An RFID system, comprising:
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a mobile radio apparatus; and a reference radio apparatus configured for radio communication with the mobile radio apparatus, the reference radio apparatus including; a first memory, a first timing generation section that measures time, a first transmission section that transmits an information-request signal requesting transmission of identification information of the mobile radio apparatus in a first period and that transmits an unmodulated-carrier-wave request signal requesting transmission of an unmodulated carrier wave to be used for positioning the mobile radio apparatus in a second period, a first receiving section that receives a response signal carrying the identification information, that receives the unmodulated carrier wave in a third period determined by time-period data stored in the first memory in accordance with timing from the first timing generation section, and that detects a phase difference of the unmodulated carrier wave, and a first control section that outputs the received identification information, that generates data indicating the detected phase difference of the unmodulated carrier wave, and that outputs the data; and the mobile radio apparatus including; a second memory that stores the identification information of the mobile radio apparatus, a second timing generation section that measures time, a second receiving section that receives the information-request signal and that receives the unmodulated carrier wave, and a second transmission section that transmits a response signal carrying the identification information in the second memory in response to receiving the information-request signal, and that transmits the unmodulated carrier wave in the third period determined by time period data stored in the second memory in accordance with timing from the second timing generation section in response to receiving the unmodulated-carrier-wave request signal.
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2. A radio apparatus capable of being used in an RFID system, the apparatus comprising:
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a memory that stores identification information of the radio apparatus; a timing generation section that measures time; a receiving section that receives an information-request signal requesting transmission of the identification information of the radio apparatus, and that receives an unmodulated-carrier-wave request signal requesting transmission of an unmodulated carrier wave to be used for positioning the radio apparatus; and a transmission section that transmits a response signal carrying the identification information in the memory in response to receiving the information-request signal, and that transmits the unmodulated carrier wave in an unmodulated-carrier transmission period determined by time period data stored in the memory in accordance with timing from the timing generation section in response to receiving the unmodulated-carrier-wave request signal. - View Dependent Claims (3, 4, 5, 10, 11, 12)
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6. A radio apparatus configured for radio communication with a mobile radio apparatus capable of being used in an RFID system, the radio apparatus comprising:
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a memory; a timing generation section that measures time; a transmission section that transmits an information-request signal requesting transmission of identification information of the mobile radio apparatus in a first period and that transmits an unmodulated-carrier-wave request signal requesting transmission of an unmodulated carrier wave to be used for positioning the mobile radio apparatus in a second period; a receiving section that receives a response signal carrying the identification information, that receives an unmodulated carrier wave in a third period determined by time-period data stored in the memory in accordance with timing from the timing generation section, and that detects a phase difference of the unmodulated carrier wave; and a control section that outputs the received identification information, and that generates data indicating the detected phase difference of the unmodulated carrier wave. - View Dependent Claims (7, 8, 9)
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Specification