RFID reading system, RFID reading method, RFID reader, RFID read controlling apparatus, RFID reader control program, computer-readable information recording medium having recorded the same, control program for RFID read control apparatus, and computer-readable information recording medium having recorded the same
First Claim
1. An RFID reading method, comprising:
- emitting, from a first RFID reader to an RFID tag, a query wave signal for requesting transmission of information in the RFID tag;
a second RFID reader receiving the query wave signal while in a standby state, in which a reply wave signal from the RFID tag can not be received;
the second RFID reader entering a reply wave wait state to wait for the reply wave signal from the RFID tag for a predetermined period of time;
the second RFID reader receiving, while in the reply wave wait state, a reply wave signal including the information stored in the RFID tag in response to the query wave signal; and
the second RFID reader returning to the standby state after the predetermined period of time expires.
1 Assignment
0 Petitions
Accused Products
Abstract
An RFID reading system includes at least two readers and at least one RF tag. Each reader includes a transmitter, a receiver, and a CPU section to control transmission of the transmitter and reception of the receiver. Both readers receive a reply signal sent from an RF tag in response to a query wave sent from either one of the readers to the RF tag. The readers obtain tag information from the RF tag based on the received signals. To prevent interference therebetween, when one of the readers sends a query wave, transmission of a query wave from the other one thereof is stopped for a predetermined period of time. The information can be read without causing interference between the readers. There are obtained an RFID reading system, an RFID reading method, and RFID reader and a control program thereof, an RFID read control device and a control program thereof, and a computer-readable information recording medium storing the control programs.
8 Citations
12 Claims
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1. An RFID reading method, comprising:
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emitting, from a first RFID reader to an RFID tag, a query wave signal for requesting transmission of information in the RFID tag; a second RFID reader receiving the query wave signal while in a standby state, in which a reply wave signal from the RFID tag can not be received; the second RFID reader entering a reply wave wait state to wait for the reply wave signal from the RFID tag for a predetermined period of time; the second RFID reader receiving, while in the reply wave wait state, a reply wave signal including the information stored in the RFID tag in response to the query wave signal; and the second RFID reader returning to the standby state after the predetermined period of time expires. - View Dependent Claims (2, 3, 4)
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5. An RFID system comprising:
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at least one first RFID reader comprising a transmitter that emits a query wave signal to an RFID tag to request information stored in the RFID tag, and a receiver that receives a reply wave signal, which including the information from the RFID tag, in response to the query wave signal; and at least one second RFID reader that receives the query wave signal, which triggers the at least one second RFID reader to be ready to receive the replay wave signal from the RFID tag in response to the query wave signal, wherein the second RFID reader comprises a control section that places the RFID reader in; a) a reply wave wait state, in which the reply wave signal can be received, after receiving the query wave signal, wherein entry to the reply wave wait state begins a predetermined period of time, and b) a standby state, in which the reply wave signal can not be received, after expiration of the predetermined period of time. - View Dependent Claims (6, 7, 8)
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9. An RFID reader comprising:
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a query wave receiving section for receiving a query wave signal emitted from another RFID reader for that requests transmission of information in an RFID tag from an RFID tag; a reply wave receiving section for receiving a reply wave signal transmitted from the RFID tag in response to the query wave signal emitted from another RFID reader; and a control section for controlling a reply wave receiving process in the RFID reader, wherein the control section puts the RFID reader in; a) a reply wave wait state for a predetermined period of time after receiving the query wave signal, wherein the reply wave receiving section can receive the reply wave signal only during the predetermined period of time and b) a standby state, in which the reply wave receiving section can not receive the reply wave signal, upon expiration of the predetermined period of time. - View Dependent Claims (10, 11, 12)
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Specification