RFID communication system and the search method thereof
First Claim
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1. A radio frequency identification (RFID) communication system, comprising:
- a reader, to produce at least one search instruction and to send the search instruction to a communication region; and
a plurality of transponders, each, with built-in data, having a first receiver, a first transmitter, a counter, a random number generator and a first controller,wherein when the transponders enter the communication region, in each transponder, the random number generator generates a random number and the counter starts to count search instruction received by the first receiver to thus obtain a counting value; and
when in one of the transponders, the counting value meets with the random number, the first controller sends a response request to the reader through the first transmitter, such that the reader after receiving the response request does not send the search instruction but sends at least one read instruction to read the built-in data.
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Abstract
A radio frequency identification (RFID) communication system and the search method thereof are disclosed, which apply search instructions and reads instructions to communicate between a read and a plurality of transponders. Each transponder generates a random number for comparison with received search instructions. When the random number meets with the number of received search instructions, a response request is sent by a corresponding transponder such that the reader can read the content of the corresponding transponder.
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Citations
14 Claims
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1. A radio frequency identification (RFID) communication system, comprising:
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a reader, to produce at least one search instruction and to send the search instruction to a communication region; and a plurality of transponders, each, with built-in data, having a first receiver, a first transmitter, a counter, a random number generator and a first controller, wherein when the transponders enter the communication region, in each transponder, the random number generator generates a random number and the counter starts to count search instruction received by the first receiver to thus obtain a counting value; and
when in one of the transponders, the counting value meets with the random number, the first controller sends a response request to the reader through the first transmitter, such that the reader after receiving the response request does not send the search instruction but sends at least one read instruction to read the built-in data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A search method for RFID communication system, comprising the steps of:
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a search step, which uses a reader to search at least one transponder in a communication region by means of a plurality of search instructions; a transponder start step, which starts the at least one transponder in the communication region in order to generate a random number and receive the search instructions for counting and further obtaining a counting value; a comparison step, which compares the random number with the counting value such that a response request is sent to the reader as the random number meets with the counting value; and a read step, which uses the reader to send at least one read instruction to the communication region such that one transponder corresponding to the response request sends its built-in data to the reader, remaining transponders do not count until the built-in data of the transponder is sent completely, and the remaining transponders repeat the transponder start step, the comparison step and the read step until all built-in data is read by the reader. - View Dependent Claims (11, 12, 13, 14)
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Specification