Interrogator, transponder and transponder identification method
First Claim
1. An interrogator that makes wireless communication with a plurality of transponders, comprising:
- a temporary number specify section transmitting to the plurality of transponders a request for transmission of an ON signal, the temporary number specify section receiving the ON signal from a transponder among the plurality of transponders in response to the request for transmission of an ON signal, the ON signal indicating a unit bit string having a predetermined length in a bit string of a temporary number generated by the transponder, the ON signal being transmitted within a time slot corresponding to the unit bit string, the temporary number specify section specifying a portion of the bit string of the temporary number based on the ON signal, the temporary number specify section repeating specifying the portion of the bit string of the temporary number based on preset priority order of plural kinds of unit bit strings until the entire bit string of the temporary number is specified; and
an identification information obtaining section transmitting, when the entire bit string of the temporary number is specified, a request for transmission of identification information to the transponder, the identification information obtaining section receiving the identification information transmitted from the transponder in response to the request for transmission of the identification information,wherein when the temporary number specify section receives a plurality of ON signals respectively transmitted from the plurality of transponders in response to the request for transmission of the ON signal, the interrogator selects the most prioritized unit bit string from among the plural kinds of unit bit strings respectively indicated by the plurality of ON signals based on the preset priority order and transmits a multi-reception acknowledgement including the selected unit bit string to the plurality of the transponders,when the multi-reception acknowledgement is received by the transponder and the unit bit string indicated by the transmitted ON signal is different from the selected unit bit string, the multi-reception acknowledgement causes the transponder to increase a standby time to a transmission of a next ON signal to the interrogator, andwhen the multi-reception acknowledgement is received by the transponder, when the unit bit string indicated by the transmitted ON signal is the selected unit bit string, and when the standby time is zero, the multi-reception acknowledgement causes the transponder to transmit the next ON signal to the interrogator.
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Accused Products
Abstract
There is provided an interrogator, transponder, and transponder identification method, which shorten processing time for identification. An interrogator that makes wireless communication with a transponder, comprising: a temporary number specify section that transmits a request for transmission of a unit bit string as a bit string having a predetermined length in a bit string expressing a temporary number owned by the transponder, receives a unit bit sting transmitted from the transponder in response to the request, and specifies the temporary number of the transponder, based on the unit bit string; and an identification information obtaining section that transmits, if a temporary number of a transponder is specified by the temporary number specify section, a request for transmission of identification information of the transponder to the transponder, and receives the identification information transmitted from the transponder, in response to the request.
25 Citations
17 Claims
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1. An interrogator that makes wireless communication with a plurality of transponders, comprising:
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a temporary number specify section transmitting to the plurality of transponders a request for transmission of an ON signal, the temporary number specify section receiving the ON signal from a transponder among the plurality of transponders in response to the request for transmission of an ON signal, the ON signal indicating a unit bit string having a predetermined length in a bit string of a temporary number generated by the transponder, the ON signal being transmitted within a time slot corresponding to the unit bit string, the temporary number specify section specifying a portion of the bit string of the temporary number based on the ON signal, the temporary number specify section repeating specifying the portion of the bit string of the temporary number based on preset priority order of plural kinds of unit bit strings until the entire bit string of the temporary number is specified; and an identification information obtaining section transmitting, when the entire bit string of the temporary number is specified, a request for transmission of identification information to the transponder, the identification information obtaining section receiving the identification information transmitted from the transponder in response to the request for transmission of the identification information, wherein when the temporary number specify section receives a plurality of ON signals respectively transmitted from the plurality of transponders in response to the request for transmission of the ON signal, the interrogator selects the most prioritized unit bit string from among the plural kinds of unit bit strings respectively indicated by the plurality of ON signals based on the preset priority order and transmits a multi-reception acknowledgement including the selected unit bit string to the plurality of the transponders, when the multi-reception acknowledgement is received by the transponder and the unit bit string indicated by the transmitted ON signal is different from the selected unit bit string, the multi-reception acknowledgement causes the transponder to increase a standby time to a transmission of a next ON signal to the interrogator, and when the multi-reception acknowledgement is received by the transponder, when the unit bit string indicated by the transmitted ON signal is the selected unit bit string, and when the standby time is zero, the multi-reception acknowledgement causes the transponder to transmit the next ON signal to the interrogator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A transponder that makes wireless communication with an interrogator, comprising:
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a temporary number generation section that generates a temporary number; an ON signal transmitter that transmits an ON signal in response to a request for transmission of the ON signal from the interrogator, the ON signal indicating a unit bit string having a predetermined length in a bit string of the temporary number, the ON signal being transmitted within a time slot corresponding to the unit bit string; and an identification information transmitter that transmits, in response to a request for transmission of identification information from the interrogator, the identification information to the interrogator, wherein when a plurality of ON signals are respectively transmitted from a plurality of transponders including the transponder in response to the request for transmission of the ON signal, the most prioritized unit bit string is selected from among plural kinds of unit bit strings respectively indicated by the plurality of ON signals based on preset priority order of the plural kinds of unit bit strings by the interrogator and a multi-reception acknowledgement including the selected unit bit string is transmitted by the interrogator, when the multi-reception acknowledgement is received by the transponder and the unit bit string indicated by the ON signal transmitted by the ON signal transmitter is different from the selected unit bit string, the ON signal transmitter increases a standby time to a transmission of a next ON signal to the interrogator, and when the multi-reception acknowledgement is received by the transponder, when the unit bit string indicated by the transmitted ON signal is the selected unit bit string, and when the standby time is zero, the ON signal transmitter transmits the next ON signal to the interrogator. - View Dependent Claims (8, 9, 10)
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11. A transponder identification method by wireless communication between an interrogator and a plurality of transponders, comprising:
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generating a plurality of temporary numbers by the plurality of transponders respectively; transmitting from the interrogator to the plurality of transponders a request for transmission of an ON signal; transmitting the ON signal from a transponder among the plurality of transponders to the interrogator in response to the request for transmission of the ON signal, the ON signal indicating a unit bit string having a predetermined length in a bit string of a temporary number generated by the transponder, the ON signal being transmitted within a time slot corresponding to the unit bit string; specifying a portion of the bit string of the temporary number by the interrogator based on the ON signal; repeating specifying the portion of the bit string of the temporary number based on preset priority order of plural kinds of unit bit strings by the interrogator until the entire bit string of the temporary number is specified; transmitting a request for transmission of identification information from the interrogator to the transponder when the entire bit string of the temporary number is specified by the interrogator; transmitting the identification information from the transponder to the interrogator in response to the request for transmission of the identification information; and receiving the identification information by the interrogator, wherein when a plurality of ON signals are respectively transmitted from a plurality of transponders in response to the request for transmission of the ON signal, the interrogator selects the most prioritized unit bit string among the plural kinds of unit bit strings respectively indicated by the plurality of ON signals based on the preset priority order and transmits a multi-reception acknowledgement including the selected unit bit string to the plurality of the transponders, when the multi-reception acknowledgement is received by the transponder and the unit bit string indicated by the transmitted ON signal is different from the selected unit bit string, the transponder increases a standby time to a transmission of a next ON signal to the interrogator, and when the multi-reception acknowledgement is received by the transponder, when the unit bit string indicated by the transmitted ON signal is the selected unit bit string, and when the standby time is zero, the ON signal transmitter transmits the next ON signal to the interrogator. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification