PASSIVE RFID SYSTEM AND METHOD
First Claim
1. A reader of a passive RFID system, the reader comprising:
- a processor dividing slots and subchannels to configure a round, recognizing subchannels that are not involved in a collision and interference by the slots, and changing the subchannels that are not involved in a collision and interference, into a sleep state;
a transmission unit encoding a command generated through the processor, performing an amplitude jitter modulation on the encoded command, and transmitting the modulated command; and
a reception unit acquiring and demodulating tag signals received through a plurality of subchannels by the slots, and providing the demodulated tag signals to the processor, so that the processor can recognize the subchannels that are not involved in a collision and interference.
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Accused Products
Abstract
Disclosed are a passive RFID (Radio Frequency Identification) system and method capable of recognizing a great deal of tags at a high speed. A reader of a passive RFID system, including: a processor dividing slots and subchannels to configure a round, recognizing subchannels that are not involved in a collision and interference by the slots, and changing the subchannels that are not involved in a collision and interference, into a sleep state; a transmission unit encoding a command generated through the processor, performing an amplitude jitter modulation on the encoded command, and transmitting the modulated command; and a reception unit acquiring and demodulating tag signals received through a plurality of subchannels by the slots, and providing the demodulated tag signals to the processor.
14 Citations
17 Claims
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1. A reader of a passive RFID system, the reader comprising:
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a processor dividing slots and subchannels to configure a round, recognizing subchannels that are not involved in a collision and interference by the slots, and changing the subchannels that are not involved in a collision and interference, into a sleep state; a transmission unit encoding a command generated through the processor, performing an amplitude jitter modulation on the encoded command, and transmitting the modulated command; and a reception unit acquiring and demodulating tag signals received through a plurality of subchannels by the slots, and providing the demodulated tag signals to the processor, so that the processor can recognize the subchannels that are not involved in a collision and interference. - View Dependent Claims (2, 3, 4, 5)
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6. A tag of a passive RFID system, the tag comprising:
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a slot selection unit randomly selecting a slot to be used for communicating with a reader; a subchannel selection unit randomly selecting a subchannel to be used for communicating with the reader; an amplitude jitter demodulation unit performing an amplitude jitter demodulation on a signal transmitted from the reader; a tag controller selecting a single slot or subchannel through the slot selection unit and the subchannel selection unit according to the signal demodulated through the amplitude jitter demodulation unit, and determining whether to transmit a tag signal to the reader or whether to enter a sleep state; and a tag signal generation unit transmitting the tag signal to a subchannel selected by the slot selection unit. - View Dependent Claims (7)
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8. An operation method of a reader included in a multi-subchannel passive RFID system of a slot-based time division scheme, the method comprising:
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transmitting a query command when a round starts or is updated to inform a plurality of tags about the number of slots and subchannels constituting the current round; simultaneously transmitting a slot command and a sleep command by the slots to request a tag signal and, at the same time, entering a tag using a subchannel that does not cause a collision and interference in a previous slot into a sleep state; and acquiring and analyzing a transmitted tag signal in response to a query command or a slot command by the slots to recognize a subchannel that is not involved in a collision and interference in a current slot, and re-entering the control operation. - View Dependent Claims (9, 10, 11)
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12. A operation method of a tag, the method comprising:
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when a query command is received, analyzing the query command to recognize the number of slots and subchannels constituting a current round, and selecting one slot and one subchannel to be used for communicating with a reader; and simultaneously receiving a slot command and a sleep command and determining whether to transmit a tag signal to the reader in response to the slot command, or whether to enter a sleep state in response to the sleep command. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification