Method for card-reading anti-collision with automatic frequency hopping
First Claim
1. A card-reading anti-collision method with automatic frequency hopping for a radio frequency identification system that includes a card reader reading multiple cards, the method comprising:
- (A) when the card reader works at one of n channels, checking via the card reader if any card responds;
if yes, proceeding to Step (B);
if no, proceeding to Step (E);
(B) checking via the card reader whether two or more cards enter an induction zone of the card reader at the same one of n channels to collide or conflict;
if yes, proceeding to Step (C);
if only one card is being read, proceeding to Step (D);
(C) issuing via the card reader a command of random frequency hopping, commanding all the conflicting cards to hop to other channels of the n channels and wait to access those channels, and proceeding to Step (E);
(D) reading transaction addresses and carrying out a transaction communication at the card reader and the only card being read;
after the transaction is completed, proceeding to Step (E); and
(E) hopping at the card reader to a next channel of the n channels in a sequence, and proceeding to Step (A);
wherein the card reader and the multiple cards have capabilities of automatic frequency-sweeping and/or of hopping from a current channel to another channel, and have capabilities of storing access addresses and transaction addresses, andwhen the card reader is in a frequency-hopping card-seeking state, the card reader is in an n-channel frequency hopping working state, in which the access address of each channel is the same, and the card reader reads the multiple cards by means of hopping frequencies in a sequence iteratively through the n channels.
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Abstract
A method for card-reading anti-collision with automatic frequency hopping is provided, which is used for a system in which a card reader simultaneously reads a plurality of cards in radio frequency identification technologies. The method comprises: both the card reader and the cards to be read are configured to have an automatic frequency-sweep function and a function of hopping from a current channel to another channel, and to store access addresses and transaction addresses; when the card reader is in a frequency-hopping card-seeking state, it is in an n-channel frequency-hopping working state, in which, the access address of each channel is the same, and the card reader reads the cards by means of hopping frequencies in a sequence iteratively through n channels. When the card reader detects that two or more cards collide, the card reader sends a command of random frequency hopping, making all the conflicting cards to hop to other channels randomly and to wait to access those channels. The beneficial effects of said method includes: it can quickly realize a card-reading anti-collision mechanism and improve the card-reading speed.
33 Citations
6 Claims
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1. A card-reading anti-collision method with automatic frequency hopping for a radio frequency identification system that includes a card reader reading multiple cards, the method comprising:
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(A) when the card reader works at one of n channels, checking via the card reader if any card responds;
if yes, proceeding to Step (B);
if no, proceeding to Step (E);(B) checking via the card reader whether two or more cards enter an induction zone of the card reader at the same one of n channels to collide or conflict;
if yes, proceeding to Step (C);
if only one card is being read, proceeding to Step (D);(C) issuing via the card reader a command of random frequency hopping, commanding all the conflicting cards to hop to other channels of the n channels and wait to access those channels, and proceeding to Step (E); (D) reading transaction addresses and carrying out a transaction communication at the card reader and the only card being read;
after the transaction is completed, proceeding to Step (E); and(E) hopping at the card reader to a next channel of the n channels in a sequence, and proceeding to Step (A); wherein the card reader and the multiple cards have capabilities of automatic frequency-sweeping and/or of hopping from a current channel to another channel, and have capabilities of storing access addresses and transaction addresses, and when the card reader is in a frequency-hopping card-seeking state, the card reader is in an n-channel frequency hopping working state, in which the access address of each channel is the same, and the card reader reads the multiple cards by means of hopping frequencies in a sequence iteratively through the n channels. - View Dependent Claims (2, 3)
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4. A radio frequency identification system for card-reading anti-collision with automatic frequency hopping, the system comprising:
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a card reader configured to read multiple cards; wherein the card reader and the multiple cards have capabilities of automatic frequency-sweeping and/or of hopping from a current channel to another channel, and have capabilities of storing access addresses and transaction addresses; wherein when the card reader is in a frequency-hopping card-seeking state, it is in an n-channel frequency hopping working state, in which the access address of each channel is the same, and the card reader reads the multiple cards by means of hopping frequencies in a sequence iteratively through n channels; and wherein; (A) when the card reader works at one of the n channels, the card reader first checks if any card responds;
if yes, the card reader proceeds to Step (B);
if no, the card reader proceeds to Step (E);(B) the card reader checks whether two or more cards enter an induction zone of the card reader at the same one of n channels to collide or conflict;
if yes, the card reader proceeds to Step (C);
if only one card is being read, the card reader proceeds to Step (D);(C) the card reader issues a command of random frequency hopping, commanding all the conflicting cards to hop to other channels of the n channels and wait to access those channels, and proceeds to Step (E); (D) the only card being read and the card reader read transaction addresses and carry out a transaction communication;
after the transaction is completed, the card reader proceeds to Step (E); and(E) the card reader hops to a next channel of the n channels in the sequence, and proceeds to Step (A). - View Dependent Claims (5, 6)
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Specification