SYSTEM FOR SIMULTANEOUSLY IDENTIFYING MASSIVE RFID TAGS USING HF BAND
First Claim
Patent Images
1. A high-frequency (HF) tag comprising:
- an analog circuit unit to communicate with a reader through an analog signal and to receive energy via magnetic coupling with a reader; and
a digital circuit unit to be supplied with power from the analog circuit unit,wherein the digital circuit unit supports a sleep mode for the tag to stand by in a low power state after transmitting an identifier (ID) to the reader and a wait mode for controlling random access to the reader.
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Abstract
A tag of an apparatus for simultaneously identifying massive tags according to the present invention may include an analog circuit unit to communicate with a reader through an analog signal and to receive energy via magnetic coupling with the reader. Further, the tag may include a digital circuit unit to be supplied with power from the analog circuit unit. The digital circuit unit may support a sleep mode for the tag to stand by in a low power state after transmitting an identifier (ID) to the reader and a wait mode for controlling random access to the reader.
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Citations
20 Claims
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1. A high-frequency (HF) tag comprising:
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an analog circuit unit to communicate with a reader through an analog signal and to receive energy via magnetic coupling with a reader; and a digital circuit unit to be supplied with power from the analog circuit unit, wherein the digital circuit unit supports a sleep mode for the tag to stand by in a low power state after transmitting an identifier (ID) to the reader and a wait mode for controlling random access to the reader. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A high-frequency (HF) reader comprising:
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an analog circuit unit to receive a tag signal and to transmit a reader command in an analog form via amplitude-shift keying (ASK) modulation; an analog-to-digital converter (ADC) to receive the modulated tag signal and to convert the tag signal into a digital signal; and a digital circuit unit to receive the digital tag signal and to generate the reader command, wherein the digital circuit unit adjusts a plurality of transmission output levels to conduct simultaneous identification of massive RFID tags. - View Dependent Claims (12, 13, 14, 15)
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16. An operation method of a tag in a system for simultaneously identifying massive radio-frequency identification (RFID) tags using a high-frequency (HF) band, the operation method comprising:
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receiving a carrier wave from a reader and waiting in a ready mode; transitioning to an arbitrate mode and selecting one of a plurality of slots set by the reader when a BeginRound command is received in the ready mode; and transitioning to a reply mode simultaneously with transmitting a stored Cyclic Redundancy Checking (CRC) packet using the selected slot. - View Dependent Claims (17)
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18. An operation method of a reader in a system for simultaneously identifying massive radio-frequency identification (RFID) tags using a high-frequency (HF) band, the operation method comprising:
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amplitude-shift keying (ASK) demodulating a received tag signal; converting an analog signal into a digital signal for digital demodulation of the tag signal; demodulating a subcarrier of the tag signal converted into the digital signal; and decoding the demodulated tag signal to extract information, wherein massive tag identification performance is improved by the ASK demodulating into the analog signal and the demodulating of the subcarrier into the digital signal. - View Dependent Claims (19, 20)
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Specification