US20060144943A1 - Anti-collision coupling for contactless cards - Google Patents
Anti-collision coupling for contactless cards Download PDFInfo
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- US20060144943A1 US20060144943A1 US11/301,549 US30154905A US2006144943A1 US 20060144943 A1 US20060144943 A1 US 20060144943A1 US 30154905 A US30154905 A US 30154905A US 2006144943 A1 US2006144943 A1 US 2006144943A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2886—Features relating to contacting the IC under test, e.g. probe heads; chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/06711—Probe needles; Cantilever beams; "Bump" contacts; Replaceable probe pins
- G01R1/06716—Elastic
- G01R1/06727—Cantilever beams
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2601—Apparatus or methods therefor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10029—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10069—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the frequency domain, e.g. by hopping from one frequency to the other
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10079—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions
Definitions
- the present disclosure relates to contactless interface devices, and more particularly relates to anti-collision coupling for contactless interface devices.
- An anti-collision coupling for contactless interface devices is provided.
- IC cards and radio frequency (RF) identification (RFID) cards are types of contactless interface devices known as contactless cards.
- RF radio frequency
- contactless cards an interface coupling or information exchange may be accomplished when the contactless cards come within range of a contactless card reader.
- an anti-collision interface coupling method is used to identify the cards that approach the reader.
- the anti-collision coupling methods for contactless cards are typically divided into close coupling methods and remote coupling methods, according to the desired approach distance between a card and a reader.
- the remote coupling methods are typically divided into proximity, vicinity and RF methods.
- CICC close coupling method
- PICC proximity coupling methods
- VICC vicinity coupling method
- the PICC methods defined in the ISO/IEC 14443 standard include a type A coupling method and a type B coupling method.
- the anti-collision method of the contactless cards that satisfy the ISO 14443 type A standard make use of a Unique Identification (UID), which each card has separately.
- UID Unique Identification
- the contactless cards each generate a signal to indicate their presence
- the reader requests a card to transfer its UID
- the card transfers the UID to the reader by unit
- the reader identifies the card by comparing the UID separately.
- the ISO 14443-A standard uses a UID method and a bit collision method, where the card is required to respond within a precise response time. Unfortunately, it takes the card a long time to respond because of the bit unit identification required within each card.
- the anti-collision method of the contactless cards that satisfy the ISO 14443 type B standard makes use of an optional value called a Pseudo Unique Proximity card Identifier (PUPI), which each card generates separately.
- PUPI Pseudo Unique Proximity card Identifier
- the reader requests the cards to generate a random value having a set scope, the cards each generate PUPI values different from each other, and the reader selects a card by calling one of the received PUPI values.
- the card In the ISO 14443-B standard, the card must generate a random value within a fixed range and the reader must generate slots. Unfortunately, this process takes a long time because of the card operation required within each card.
- the anti-collision method of the contactless cards that satisfy the ISO 15693 standard makes use of a Unique Identification (UID), which each card has separately.
- UID Unique Identification
- the reader When the contactless cards approach an effective region of the reader, the reader generates a slot having sixteen values whenever an EOF occurs.
- the reader requests a card to transfer a UID and recognizes the card by noting that the card responds to a slot that has the same value as its UID.
- the ISO 15693 standard uses a UID method, where the reader must make 16 slots.
- the card responds to the corresponding slot when the UID is in accord with the slot.
- the card compares its UID with the slots 0 to 16 , and counts the slot whenever the EOF occurs.
- An exemplary embodiment anti-collision coupling method includes requesting that contactless cards transmit their unique identifiers that each include a fixed number of bytes, receiving the unique identifiers simultaneously as byte-wise positive pulses, counting the received positive pulses, and determining that more than one card responded if the number of received positive pulses exceeds the fixed number of bytes.
- Exemplary embodiment contactless cards include a unique identifier having a number of bytes, a receiver for receiving an anti-collision command indicative of a desired identifier byte, a comparator in signal communication with the receiver for comparing the desired identifier byte with a corresponding byte of the unique identifier, and a transmitter responsive to the comparator for transmitting the unique identifier as byte-wise positive pulses if the desired identifier byte matches the corresponding byte of the unique identifier.
- the present disclosure presents an anti-collision coupling for contactless cards in accordance with the following exemplary figures, in which:
- FIG. 1 shows a schematic block diagram for a communication between a contactless card and a reader
- FIG. 2 shows a schematic block diagram for a communication method of contactless cards that meets the ISO/IEC 14443 type A standard
- FIG. 3 shows a schematic block diagram for a communication method of contactless cards that meets the ISO/IEC 14443 type B standard
- FIG. 4 shows a schematic block diagram for a communication method of contactless cards that meets the ISO/IEC 15693 standard
- FIG. 5 shows a schematic block diagram for a communication method of contactless cards in accordance with an exemplary embodiment of the present disclosure
- FIG. 6 shows a schematic signal diagram for transferring and receiving card identifications with positive pulses in accordance with FIG. 5 ;
- FIGS. 7 and 8 show a schematic flow diagram for an anti-collision method using card identification in accordance with FIG. 5 ;
- FIG. 9 shows a schematic signal diagram for a call command from the reader to nearby cards in accordance with FIG. 5 ;
- FIG. 10 shows a schematic signal diagram for responses from the nearby cards to the reader in accordance with FIG. 9 ;
- FIG. 11 shows a schematic signal diagram for an anti-collision command from the reader to a selected card in accordance with FIG. 10 ;
- FIG. 12 shows a schematic signal diagram for a response from the selected card to the reader in accordance with FIG. 11 ;
- FIG. 13 shows a schematic signal diagram for an anti-collision command from the reader to selected cards in accordance with FIG. 10 ;
- FIG. 14 shows a schematic signal diagram for responses from the selected cards to the reader in accordance with FIG. 13 ;
- FIG. 15 shows a schematic signal diagram for a second anti-collision command from the reader to the selected card in accordance with FIG. 14 ;
- FIG. 16 shows a schematic signal diagram for a response from the selected card to the reader in accordance with FIG. 15 ;
- FIG. 17 shows a schematic signal diagram for a second anti-collision command from the reader to the selected card in accordance with FIG. 14 ;
- FIG. 18 shows a schematic signal diagram for a response from the selected card to the reader in accordance with FIG. 17 .
- the present disclosure relates to contactless integrated circuit (IC) cards and radio frequency (RF) interface devices (RFID), and more particularly relates to anti-collision methods for interfacing such cards and devices.
- An exemplary method is used to identify a number of contactless IC or RFID cards associated with a reader by using a unique identification (UID) of each of the cards when a plural number of cards approach the reader. The method identifies each card to prevent collisions between the cards without requiring complex arithmetic operations by the cards.
- a conventional communication system between a reader 110 and contactless cards 120 , 130 and 140 is indicated generally by the reference numeral 100 . If more than one contactless card is approaching the reader, confusion may arise in the reader because of concurrent signals from the cards to the reader.
- An anti-collision method is used to identify the cards that approach the reader in an effort to prevent such confusion.
- the anti-collision method 200 makes use of a Unique Identification (UID), which each card has separately.
- UID may be an 8-byte value using a bitwise comparison.
- the contactless cards When the contactless cards approach an effective region of the reader, the contactless cards generate a signal to alert the reader to their presence.
- the reader requests the card to transfer the UID at step S 200 .
- the card transfers the UID to the reader by unit at step S 210 .
- the UID is transmitted bitwise in the shape of negative pulse modulation on a center frequency using Manchester coding and bit operations.
- the probability of a bit collision between corresponding bits from two different cards is 1 in 2 or 50%.
- the reader identifies the card by comparing the UID separately at step S 220 .
- This ISO 14443-A method uses a UID method and a bit collision method, where the card is required to meet a precise response time. Unfortunately, the bit unit identification is time consuming and bit collisions for multiple cards are obscured by the central frequency.
- the anti-collision method 300 makes use of an optional value, which is called a Pseudo Unique Proximity card Identifier (PUPI) and which each card generates separately.
- PUPI Pseudo Unique Proximity card Identifier
- the PUPI is a single-byte randomized value corresponding to a slot.
- the reader discerns the card by calling one of the PUPI identifiers at step S 320 .
- This ISO 14443-B method requires the card to make a random value within a fixed range and requires the reader to make slots. Unfortunately, the card operation is time consuming.
- a conventional communication method for contactless cards that satisfies the ISO/IEC 15693 standard is indicated generally by the reference numeral 400 .
- the anti-collision method 400 makes use of a UID, which each card has separately.
- the reader When the contactless cards approach an effective region of the reader, the reader generates a slot having sixteen values whenever an EOF occurs at step S 400 .
- the reader requests the card to transfer a UID at step S 410 .
- the reader discerns the card by detecting that the card responds a slot that has the same value as its UID at step S 420 .
- This ISO 15693 method uses a UID method and requires the reader to make 16 slots. The card must respond to the corresponding slot when the UID is in accord with the slot. Thus, the card compares its UID with the slots 0 through 16 , and counts the slot whenever the EOF occurs. Unfortunately, the card operation is time consuming.
- the system 500 includes a reader 510 and contactless cards 520 , 530 and 540 .
- Each contactless card has its own peculiar UID.
- the reader When the contactless cards approach an effective range of the reader, the reader generates a command to call for the UIDs of the cards.
- the cards simultaneously transfer their respective UIDs to the reader per byte, where each byte is in the shape of a positive pulse.
- the positive pulses of the present embodiment prevent the values from becoming obscured.
- the probability of a byte collision between a corresponding byte from two different cards is 1 in 256 or about 0.4%.
- signals for transferring and receiving card identifications with positive pulses are indicated generally by the reference numeral 600 .
- the signals 600 show how each card that received a call command transfers its UID to the reader in shape of the positive pulse.
- Card 1 transfers its UID 610 to the reader
- Card 2 transfers its UID 620 to the reader
- Card 3 transfers its UID 630 to the reader.
- the reader receives the composite UID signal 640 , in which the bytes of the card UIDs are individually detectable by detecting the positive pulses.
- each card that receives the call command transfers its UID to the reader as positive pulses.
- the UID 610 of Card 1 includes a first UID byte value of 150, a second UID byte value of 180 and a third UID byte value of 180.
- the UID 620 of Card 2 includes a first UID byte value of 100, a second UID byte value of 80 and a third UID byte value of 80.
- the UID 630 of Card 3 includes a first UID byte value of 150, a second UID byte value of 120 and a third UID byte value of 120.
- the composite UID signal 640 at the reader includes first UID byte values of 100 and 150, second UID byte values of 80, 120 and 180, and third UID byte values of 80, 120 and 180.
- an anti-collision method using card identification is indicated generally by the reference numerals 700 and 800 .
- the method 700 includes a function block S 600 , at which the reader requests the cards to transfer the UIDs. That block passes control to a function block S 610 , at which each card transfers the bytes of its UID to the reader, each UID byte in the shape of a positive pulse. That block, in turn, passes control to a decision block S 620 , which determines if more than one card approaches the reader. If only one card approaches, that card is selected and control passes to a function block S 700 , at which the selected card or cards are activated and other commands from the reader may be executed.
- control is passed from block S 620 to a function block S 630 , at which the reader selects a first card's first UID byte from the received first UID bytes and calls the corresponding card. That block passes control to a decision block S 640 , which determines if more than one card responds to the reader. If only one card responds, control is passed to another decision block S 650 , which determines if the reader has called all of the first UID bytes received in the composite signal. If the reader has not yet called all of the first UID bytes, control is passed back to the function block S 630 . If, on the other hand, the reader has already called all of the first UID bytes, control is passed to the function block S 700 .
- control is passed to a function block S 660 , at which the reader selects a second UID byte from among the second UID bytes received in the composite UID and calls the corresponding card. That block passes control to a decision block S 670 , which determines if more than one card still responds to the reader. If only one card responds to the reader, the block S 670 passes control to another decision block S 680 , which determines if the reader has called all of the second UID bytes received in the composite UID signal. If the reader has not yet called all of the second UID bytes, control is passed back to the function block S 660 . If, on the other hand, the reader has already called all of the second UID bytes, control is passed to the function block S 700 .
- the function block S 690 passes control to the function block S 700 .
- a signal for a call command from the reader to nearby cards is indicated generally by the reference numeral 900 .
- the signal 900 includes a UID call command.
- the reader 510 of FIG. 5 generates the UID call command to call for the UIDs of the contactless cards 520 , 530 and 540 when the contactless cards approach an effective region of the reader, where each contactless card has its own peculiar UID.
- the signal 900 further includes a start and an end using a Start of Frame (SOF) and an End of Frame (EOF), respectively.
- the reader 510 transfers the SOF and the UID call command and the SOF when the contactless cards 520 , 530 and/or 540 approach the reader.
- signals for responses from the nearby cards to the reader are indicated generally by the reference numeral 1000 .
- These card signals could follow the receiver signal 900 of FIG. 9 .
- the cards 520 , 530 and 540 of FIG. 5 which each receive the UID call command from the reader 510 , transfer their particular UIDs to the reader as the signals 1020 , 1030 and 1040 , respectively.
- Each card transfers each of its UID bytes to the reader in the shape of a positive pulse.
- the signals 1020 , 1030 and 1040 each begin with an SOF, followed by the first through fourth UID bytes for the respective card and an EOF.
- the UID of Card 1 is 96h, B4h, B4h, A9h; the UID of Card 2 is 64h, 50h, 50h, 10h; and the UID of card 3 is 96h, 78h, 78h, 12h.
- the reader 510 recognizes whether more than one card approaches the reader by counting the positive pulses. That is, for the exemplary four-byte UIDs, the reader expects exactly four positive pulses if a single card approaches, but five or more pulses for multiple cards since at least one byte of the UID will be different for other cards.
- a signal for an anti-collision command from the reader to a selected card is indicated generally by the reference numeral 1100 .
- This receiver signal could follow the card signals 1000 of FIG. 10 .
- the signal indicates how the reader 510 of FIG. 5 calls the corresponding card by selecting one of the first UID bytes (e.g., 64h or 96h) for the cards 520 , 530 or 540 .
- the reader transfers the anti-collision command “02” and the UID byte location “01” and the UID value 64h to the card.
- a signal for a response from the selected card to the reader is indicated generally by the reference numeral 1200 .
- This card signal could follow the receiver signal 1100 of FIG. 11 .
- the signal 1200 shows that Card 2 or 530 of FIG. 5 sends an SOF followed by a first UID byte of 64h in response to the reader's call signal 1100 of FIG. 11 .
- the card 530 responds to the call of the reader and transfers its UID bytes consecutively each in the shape of a positive pulse after receiving the anti-collision command “02”, the UID location “01” and the matching first UID byte value of 64h.
- a signal for an anti-collision command from the reader to selected cards is indicated generally by the reference numeral 1300 .
- This receiver signal could follow the card signals 1000 of FIG. 10 .
- the signal 1300 includes an SOF, the anti-collision command “02”, the UID byte location “01” indicating the first UID byte, the first UID byte value of 96h, and an EOF.
- the signal 1300 may occur when the reader 510 of FIG. 5 fully identifies one card (i.e., Card 2 or 530 of FIG. 5 ) and then calls another first byte of 96h.
- the reader transfers the anti-collision command specifying the first UID byte location and the first UID byte value of 96h to the matching cards.
- signals for responses from the selected cards to the reader are indicated generally by the reference numeral 1400 . These card signals could follow the receiver signal 1300 of FIG. 13 .
- the response signals 1400 include a response signal 1420 from Card 1 or 520 of FIG. 5 , and a response signal 1440 from Card 3 or 540 of FIG. 5 .
- Each of the response signals begins with an SOF and has the same first UID byte value of 96h.
- the two cards each correspond to the first UID byte of 64h that the reader 510 calls, thus each of these two cards responds to the reader and transfers its respective UID bytes in shape of a positive pulse per byte immediately after receiving the anti-collision command “02”, the UID byte location “01” and the first UID byte value of 64h.
- a signal for a second anti-collision command from the reader to the selected card is indicated generally by the reference numeral 1500 .
- This receiver signal could follow the card signals 1400 of FIG. 14 .
- the signal 1500 includes an SOF, the anti-collision command “02”, the UID location “02” indicating the number of UID bytes specified, the first UID byte value of 96h, the second UID byte value of B4h, and an EOF.
- a signal for a response from the selected card to the reader is indicated generally by the reference numeral 1600 .
- This card signal could follow the receiver signal 1500 of FIG. 15 .
- the card signal 1600 includes a SOF, the first through fourth UID bytes of 96h, B4h, B4h, and A9h, respectively, and an EOF.
- Card 1 or 520 of FIG. 5 responds to the reader because it corresponds to the first and the second UID bytes of 96h and B4h that the reader selects.
- Card 1 responds to the reader and transfers its particular UID bytes in the shape of a positive pulse per byte after receiving the anti-collision command “02”, the greatest UID byte location “02” and the first and second UID byte values of 96h and B4h, respectively.
- a signal for a second anti-collision command from the reader to the selected card is indicated generally by the reference numeral 1700 .
- This receiver signal could follow the card signals 1400 of FIG. 14 .
- the signal 1700 includes an SOF, the anti-collision command “02”, the UID location “02” indicating the number of consecutive UID bytes specified, the first UID byte value of 96h, the second UID byte value of 78h, and an EOF.
- the signal 1700 is used by the reader 510 of FIG. 5 to identify another card, where the reader calls another second byte, this time 78h.
- the reader transfers to the cards the anti-collision command “02” and the highest UID byte location “02” and the first and the second UID byte values of 96h and 78h, respectively.
- a signal for a response from the selected card to the reader is indicated generally by the reference numeral 1800 .
- This card signal could follow the receiver signal 1700 of FIG. 17 .
- the card signal 1800 includes a SOF, the first through fourth UID bytes of 96h, 78h, 78h, and 12h, respectively, and an EOF.
- the Card 3 or 540 of FIG. 5 responds to the reader because it is the one corresponding to the first and the second UID bytes of 96h and 78h, respectively, that the reader selects and calls.
- Card 3 responds to the reader and transfers its UID bytes in shape of a positive pulse for each byte immediately after receiving the anti-collision command “02”, the number of UID byte locations “02”, and the first and second UID byte values of 96h and 78h, respectively.
- teachings of the present disclosure may be implemented in various forms of hardware, software, firmware, special purpose processors, or combinations thereof. Most preferably, the teachings of the present disclosure are implemented as a combination of hardware and software.
- the software is preferably implemented as an application program tangibly embodied on a program storage unit.
- the application program may be uploaded to, and executed by, a machine comprising any suitable architecture.
- the machine is implemented on a computer platform having hardware such as one or more central processing units (“CPU”), a random access memory (“RAM”), and input/output (“I/O”) interfaces.
- CPU central processing units
- RAM random access memory
- I/O input/output
- the computer platform may also include an operating system and microinstruction code.
- various processes and functions described herein may be either part of the microinstruction code or part of the application program, or any combination thereof, which may be executed by a CPU.
- various other peripheral units may be connected to the computer platform such as an additional data storage unit and a printing unit.
Abstract
Contactless cards and a corresponding anti-collision coupling method are provided, where the method includes requesting that the cards transmit their unique identifiers that each include a fixed number of bytes, receiving the unique identifiers simultaneously as byte-wise positive pulses, counting the received positive pulses, and determining that more than one card responded if the number of received positive pulses exceeds the fixed number of bytes; and where the contactless cards each include a unique identifier having a number of bytes, a receiver for receiving an anti-collision command indicative of a desired identifier byte, a comparator in signal communication with the receiver for comparing the desired identifier byte with a corresponding byte of the unique identifier, and a transmitter responsive to the comparator for transmitting the unique identifier as byte-wise positive pulses if the desired identifier byte matches the corresponding byte of the unique identifier.
Description
- The present disclosure relates to contactless interface devices, and more particularly relates to anti-collision coupling for contactless interface devices. An anti-collision coupling for contactless interface devices is provided.
- Contactless integrated circuit (IC) cards and radio frequency (RF) identification (RFID) cards are types of contactless interface devices known as contactless cards. In such contactless cards, an interface coupling or information exchange may be accomplished when the contactless cards come within range of a contactless card reader.
- If more than one contactless card approaches a reader at the same time, there may be confusion in the reader because of multiple concurrent signals from each card. To alleviate such confusion, an anti-collision interface coupling method is used to identify the cards that approach the reader.
- The anti-collision coupling methods for contactless cards are typically divided into close coupling methods and remote coupling methods, according to the desired approach distance between a card and a reader. In addition, the remote coupling methods are typically divided into proximity, vicinity and RF methods.
- An example of a close coupling method (CICC) is set forth in the ISO 10536 standard, as known in the art. Examples of proximity coupling methods (PICC) are set forth in the ISO/IEC 14443 standard, as also known in the art. An example of a vicinity coupling method (VICC) is set forth in the ISO/IEC 15693 standard, as further known in the art.
- The PICC methods defined in the ISO/IEC 14443 standard include a type A coupling method and a type B coupling method. For the type A method, the anti-collision method of the contactless cards that satisfy the ISO 14443 type A standard make use of a Unique Identification (UID), which each card has separately. When the contactless cards approach an effective region of the reader, the contactless cards each generate a signal to indicate their presence, the reader requests a card to transfer its UID, the card transfers the UID to the reader by unit, and the reader identifies the card by comparing the UID separately. The ISO 14443-A standard uses a UID method and a bit collision method, where the card is required to respond within a precise response time. Unfortunately, it takes the card a long time to respond because of the bit unit identification required within each card.
- For the type B method, the anti-collision method of the contactless cards that satisfy the ISO 14443 type B standard makes use of an optional value called a Pseudo Unique Proximity card Identifier (PUPI), which each card generates separately. When the contactless cards approach an effective region of the reader, the reader requests the cards to generate a random value having a set scope, the cards each generate PUPI values different from each other, and the reader selects a card by calling one of the received PUPI values. In the ISO 14443-B standard, the card must generate a random value within a fixed range and the reader must generate slots. Unfortunately, this process takes a long time because of the card operation required within each card.
- For the vicinity method, the anti-collision method of the contactless cards that satisfy the ISO 15693 standard makes use of a Unique Identification (UID), which each card has separately. When the contactless cards approach an effective region of the reader, the reader generates a slot having sixteen values whenever an EOF occurs. The reader requests a card to transfer a UID and recognizes the card by noting that the card responds to a slot that has the same value as its UID. The ISO 15693 standard uses a UID method, where the reader must make 16 slots. The card responds to the corresponding slot when the UID is in accord with the slot. The card compares its UID with the
slots 0 to 16, and counts the slot whenever the EOF occurs. Unfortunately, this process takes a long time because of the card operation required within each card. Thus, conventional methods for anti-collision coupling suffer from the disadvantage that a complex arithmetic operation is required within each card. The above and other drawbacks and disadvantages of the prior art are addressed by an anti-collision coupling for contactless cards in accordance with exemplary embodiments of the present disclosure. - Contactless cards and a corresponding anti-collision coupling method are provided. An exemplary embodiment anti-collision coupling method includes requesting that contactless cards transmit their unique identifiers that each include a fixed number of bytes, receiving the unique identifiers simultaneously as byte-wise positive pulses, counting the received positive pulses, and determining that more than one card responded if the number of received positive pulses exceeds the fixed number of bytes.
- Exemplary embodiment contactless cards include a unique identifier having a number of bytes, a receiver for receiving an anti-collision command indicative of a desired identifier byte, a comparator in signal communication with the receiver for comparing the desired identifier byte with a corresponding byte of the unique identifier, and a transmitter responsive to the comparator for transmitting the unique identifier as byte-wise positive pulses if the desired identifier byte matches the corresponding byte of the unique identifier.
- These and other features of the present disclosure will become apparent from the following description of exemplary embodiments, which is to be read in connection with the accompanying drawings.
- The present disclosure presents an anti-collision coupling for contactless cards in accordance with the following exemplary figures, in which:
-
FIG. 1 shows a schematic block diagram for a communication between a contactless card and a reader; -
FIG. 2 shows a schematic block diagram for a communication method of contactless cards that meets the ISO/IEC 14443 type A standard; -
FIG. 3 shows a schematic block diagram for a communication method of contactless cards that meets the ISO/IEC 14443 type B standard; -
FIG. 4 shows a schematic block diagram for a communication method of contactless cards that meets the ISO/IEC 15693 standard; -
FIG. 5 shows a schematic block diagram for a communication method of contactless cards in accordance with an exemplary embodiment of the present disclosure; -
FIG. 6 shows a schematic signal diagram for transferring and receiving card identifications with positive pulses in accordance withFIG. 5 ;FIGS. 7 and 8 show a schematic flow diagram for an anti-collision method using card identification in accordance withFIG. 5 ;FIG. 9 shows a schematic signal diagram for a call command from the reader to nearby cards in accordance withFIG. 5 ;FIG. 10 shows a schematic signal diagram for responses from the nearby cards to the reader in accordance withFIG. 9 ;FIG. 11 shows a schematic signal diagram for an anti-collision command from the reader to a selected card in accordance withFIG. 10 ; -
FIG. 12 shows a schematic signal diagram for a response from the selected card to the reader in accordance withFIG. 11 ; -
FIG. 13 shows a schematic signal diagram for an anti-collision command from the reader to selected cards in accordance withFIG. 10 ; -
FIG. 14 shows a schematic signal diagram for responses from the selected cards to the reader in accordance withFIG. 13 ; -
FIG. 15 shows a schematic signal diagram for a second anti-collision command from the reader to the selected card in accordance withFIG. 14 ; -
FIG. 16 shows a schematic signal diagram for a response from the selected card to the reader in accordance withFIG. 15 ; -
FIG. 17 shows a schematic signal diagram for a second anti-collision command from the reader to the selected card in accordance withFIG. 14 ; and -
FIG. 18 shows a schematic signal diagram for a response from the selected card to the reader in accordance withFIG. 17 . - The present disclosure relates to contactless integrated circuit (IC) cards and radio frequency (RF) interface devices (RFID), and more particularly relates to anti-collision methods for interfacing such cards and devices. An exemplary method is used to identify a number of contactless IC or RFID cards associated with a reader by using a unique identification (UID) of each of the cards when a plural number of cards approach the reader. The method identifies each card to prevent collisions between the cards without requiring complex arithmetic operations by the cards. As shown in
FIG. 1 , a conventional communication system between areader 110 andcontactless cards reference numeral 100. If more than one contactless card is approaching the reader, confusion may arise in the reader because of concurrent signals from the cards to the reader. An anti-collision method is used to identify the cards that approach the reader in an effort to prevent such confusion. - Turning to
FIG. 2 , a conventional communication method for contactless cards that satisfies the ISO/IEC 14443 type A standard is indicated generally by thereference numeral 200. Theanti-collision method 200 makes use of a Unique Identification (UID), which each card has separately. Here, the UID may be an 8-byte value using a bitwise comparison. When the contactless cards approach an effective region of the reader, the contactless cards generate a signal to alert the reader to their presence. The reader requests the card to transfer the UID at step S200. The card transfers the UID to the reader by unit at step S210. The UID is transmitted bitwise in the shape of negative pulse modulation on a center frequency using Manchester coding and bit operations. Here, the probability of a bit collision between corresponding bits from two different cards is 1 in 2 or 50%. The reader identifies the card by comparing the UID separately at step S220. This ISO 14443-A method uses a UID method and a bit collision method, where the card is required to meet a precise response time. Unfortunately, the bit unit identification is time consuming and bit collisions for multiple cards are obscured by the central frequency. - Turning now to
FIG. 3 , a conventional communication method for contactless cards that satisfies the ISO/IEC 14443 type B standard is indicated generally by thereference numeral 300. Theanti-collision method 300 makes use of an optional value, which is called a Pseudo Unique Proximity card Identifier (PUPI) and which each card generates separately. The PUPI is a single-byte randomized value corresponding to a slot. When the contactless cards approach an effective region of the reader, the reader requests the cards to each generate a random value having a set scope at step S300. The cards generate a PUPI different from each other atstep S31 0. The reader discerns the card by calling one of the PUPI identifiers at step S320. This ISO 14443-B method requires the card to make a random value within a fixed range and requires the reader to make slots. Unfortunately, the card operation is time consuming. - As shown in
FIG. 4 , a conventional communication method for contactless cards that satisfies the ISO/IEC 15693 standard is indicated generally by thereference numeral 400. Theanti-collision method 400 makes use of a UID, which each card has separately. When the contactless cards approach an effective region of the reader, the reader generates a slot having sixteen values whenever an EOF occurs at step S400. The reader requests the card to transfer a UID at step S410. The reader discerns the card by detecting that the card responds a slot that has the same value as its UID at step S420. This ISO 15693 method uses a UID method and requires the reader to make 16 slots. The card must respond to the corresponding slot when the UID is in accord with the slot. Thus, the card compares its UID with theslots 0 through 16, and counts the slot whenever the EOF occurs. Unfortunately, the card operation is time consuming. - Turning to
FIG. 5 , a communication system embodiment of the present disclosure is indicated generally by thereference numeral 500. Thesystem 500 includes areader 510 andcontactless cards - Turning now to
FIG. 6 , signals for transferring and receiving card identifications with positive pulses are indicated generally by thereference numeral 600. Thesignals 600 show how each card that received a call command transfers its UID to the reader in shape of the positive pulse.Card 1 transfers itsUID 610 to the reader,Card 2 transfers itsUID 620 to the reader, andCard 3 transfers itsUID 630 to the reader. The reader receives thecomposite UID signal 640, in which the bytes of the card UIDs are individually detectable by detecting the positive pulses. - Thus, each card that receives the call command transfers its UID to the reader as positive pulses. The
UID 610 ofCard 1 includes a first UID byte value of 150, a second UID byte value of 180 and a third UID byte value of 180. TheUID 620 ofCard 2 includes a first UID byte value of 100, a second UID byte value of 80 and a third UID byte value of 80. TheUID 630 ofCard 3 includes a first UID byte value of 150, a second UID byte value of 120 and a third UID byte value of 120. Thecomposite UID signal 640 at the reader includes first UID byte values of 100 and 150, second UID byte values of 80, 120 and 180, and third UID byte values of 80, 120 and 180. - As shown in
FIGS. 7 and 8 , an anti-collision method using card identification is indicated generally by thereference numerals method 700 includes a function block S600, at which the reader requests the cards to transfer the UIDs. That block passes control to a function block S610, at which each card transfers the bytes of its UID to the reader, each UID byte in the shape of a positive pulse. That block, in turn, passes control to a decision block S620, which determines if more than one card approaches the reader. If only one card approaches, that card is selected and control passes to a function block S700, at which the selected card or cards are activated and other commands from the reader may be executed. If more than one card approaches, control is passed from block S620 to a function block S630, at which the reader selects a first card's first UID byte from the received first UID bytes and calls the corresponding card. That block passes control to a decision block S640, which determines if more than one card responds to the reader. If only one card responds, control is passed to another decision block S650, which determines if the reader has called all of the first UID bytes received in the composite signal. If the reader has not yet called all of the first UID bytes, control is passed back to the function block S630. If, on the other hand, the reader has already called all of the first UID bytes, control is passed to the function block S700. - If the decision block S640 determines that more than one card responds to the reader, control is passed to a function block S660, at which the reader selects a second UID byte from among the second UID bytes received in the composite UID and calls the corresponding card. That block passes control to a decision block S670, which determines if more than one card still responds to the reader. If only one card responds to the reader, the block S670 passes control to another decision block S680, which determines if the reader has called all of the second UID bytes received in the composite UID signal. If the reader has not yet called all of the second UID bytes, control is passed back to the function block S660. If, on the other hand, the reader has already called all of the second UID bytes, control is passed to the function block S700.
- If the decision block S670 determines that more than one card still responds to the reader, control passes to a function block S690. At the function block S690, which represents a recursive loop duplicating steps S630 through S650 or S660 through S680 for up to an nth UID byte (e.g., n=3,4,5 . . . ), the reader selects an nth UID byte from among the nth UID bytes received in the composite UID signal and calls the corresponding card. The function block S690 passes control to the function block S700.
- Turning now to
FIG. 9 , a signal for a call command from the reader to nearby cards is indicated generally by thereference numeral 900. Here, thesignal 900 includes a UID call command. Thereader 510 ofFIG. 5 generates the UID call command to call for the UIDs of thecontactless cards - The
signal 900 further includes a start and an end using a Start of Frame (SOF) and an End of Frame (EOF), respectively. Thereader 510 transfers the SOF and the UID call command and the SOF when thecontactless cards - As shown in
FIG. 10 , signals for responses from the nearby cards to the reader are indicated generally by thereference numeral 1000. These card signals could follow thereceiver signal 900 ofFIG. 9 . Thecards FIG. 5 , which each receive the UID call command from thereader 510, transfer their particular UIDs to the reader as thesignals signals Card 1 is 96h, B4h, B4h, A9h; the UID ofCard 2 is 64h, 50h, 50h, 10h; and the UID ofcard 3 is 96h, 78h, 78h, 12h. Thereader 510 recognizes whether more than one card approaches the reader by counting the positive pulses. That is, for the exemplary four-byte UIDs, the reader expects exactly four positive pulses if a single card approaches, but five or more pulses for multiple cards since at least one byte of the UID will be different for other cards. - Turning to
FIG. 11 , a signal for an anti-collision command from the reader to a selected card is indicated generally by thereference numeral 1100. This receiver signal could follow the card signals 1000 ofFIG. 10 . The signal indicates how thereader 510 ofFIG. 5 calls the corresponding card by selecting one of the first UID bytes (e.g., 64h or 96h) for thecards UID value 64h to the card. - Turning now to
FIG. 12 , a signal for a response from the selected card to the reader is indicated generally by thereference numeral 1200. This card signal could follow thereceiver signal 1100 ofFIG. 11 . Thesignal 1200 shows thatCard FIG. 5 sends an SOF followed by a first UID byte of 64h in response to the reader'scall signal 1100 ofFIG. 11 . Thecard 530 responds to the call of the reader and transfers its UID bytes consecutively each in the shape of a positive pulse after receiving the anti-collision command “02”, the UID location “01” and the matching first UID byte value of 64h. - As shown in
FIG. 13 , a signal for an anti-collision command from the reader to selected cards is indicated generally by thereference numeral 1300. This receiver signal could follow the card signals 1000 ofFIG. 10 . Thesignal 1300 includes an SOF, the anti-collision command “02”, the UID byte location “01” indicating the first UID byte, the first UID byte value of 96h, and an EOF. Thesignal 1300 may occur when thereader 510 ofFIG. 5 fully identifies one card (i.e.,Card FIG. 5 ) and then calls another first byte of 96h. Thus, the reader transfers the anti-collision command specifying the first UID byte location and the first UID byte value of 96h to the matching cards. - Turning to
FIG. 14 , signals for responses from the selected cards to the reader are indicated generally by thereference numeral 1400. These card signals could follow thereceiver signal 1300 ofFIG. 13 . The response signals 1400 include aresponse signal 1420 fromCard FIG. 5 , and a response signal 1440 fromCard FIG. 5 . Each of the response signals begins with an SOF and has the same first UID byte value of 96h. The two cards each correspond to the first UID byte of 64h that thereader 510 calls, thus each of these two cards responds to the reader and transfers its respective UID bytes in shape of a positive pulse per byte immediately after receiving the anti-collision command “02”, the UID byte location “01” and the first UID byte value of 64h. - Turning now to
FIG. 15 , a signal for a second anti-collision command from the reader to the selected card is indicated generally by thereference numeral 1500. This receiver signal could follow the card signals 1400 ofFIG. 14 . Thesignal 1500 includes an SOF, the anti-collision command “02”, the UID location “02” indicating the number of UID bytes specified, the first UID byte value of 96h, the second UID byte value of B4h, and an EOF. Thereader 510 ofFIG. 5 transfers the anti-collision command, the highest UID byte location, and the first and second UID byte values of 96h and B4h, respectively, to thecards - As shown in
FIG. 16 , a signal for a response from the selected card to the reader is indicated generally by thereference numeral 1600. This card signal could follow thereceiver signal 1500 ofFIG. 15 . Thecard signal 1600 includes a SOF, the first through fourth UID bytes of 96h, B4h, B4h, and A9h, respectively, and an EOF. Thus,Card FIG. 5 responds to the reader because it corresponds to the first and the second UID bytes of 96h and B4h that the reader selects.Card 1 responds to the reader and transfers its particular UID bytes in the shape of a positive pulse per byte after receiving the anti-collision command “02”, the greatest UID byte location “02” and the first and second UID byte values of 96h and B4h, respectively. - Turning to
FIG. 17 , a signal for a second anti-collision command from the reader to the selected card is indicated generally by thereference numeral 1700. This receiver signal could follow the card signals 1400 ofFIG. 14 . Thesignal 1700 includes an SOF, the anti-collision command “02”, the UID location “02” indicating the number of consecutive UID bytes specified, the first UID byte value of 96h, the second UID byte value of 78h, and an EOF. Thesignal 1700 is used by thereader 510 ofFIG. 5 to identify another card, where the reader calls another second byte, thistime 78h. Thus, the reader transfers to the cards the anti-collision command “02” and the highest UID byte location “02” and the first and the second UID byte values of 96h and 78h, respectively. - Turning now to
FIG. 18 , a signal for a response from the selected card to the reader is indicated generally by thereference numeral 1800. This card signal could follow thereceiver signal 1700 ofFIG. 17 . Thecard signal 1800 includes a SOF, the first through fourth UID bytes of 96h, 78h, 78h, and 12h, respectively, and an EOF. Thus, theCard FIG. 5 responds to the reader because it is the one corresponding to the first and the second UID bytes of 96h and 78h, respectively, that the reader selects and calls.Card 3 responds to the reader and transfers its UID bytes in shape of a positive pulse for each byte immediately after receiving the anti-collision command “02”, the number of UID byte locations “02”, and the first and second UID byte values of 96h and 78h, respectively. These and other features and advantages of the present disclosure may be readily ascertained by one of ordinary skill in the pertinent art based on the teachings herein. For example, it shall be understood that the teachings of the present disclosure may be extended to UIDs having an arbitrary number of bytes, or to UIDs that are randomly generated on the fly. The features of positive pulse detection and byte-wise comparison are useful for collision prevention. - It is to be understood that the teachings of the present disclosure may be implemented in various forms of hardware, software, firmware, special purpose processors, or combinations thereof. Most preferably, the teachings of the present disclosure are implemented as a combination of hardware and software. Moreover, the software is preferably implemented as an application program tangibly embodied on a program storage unit. The application program may be uploaded to, and executed by, a machine comprising any suitable architecture. Preferably, the machine is implemented on a computer platform having hardware such as one or more central processing units (“CPU”), a random access memory (“RAM”), and input/output (“I/O”) interfaces. The computer platform may also include an operating system and microinstruction code. The various processes and functions described herein may be either part of the microinstruction code or part of the application program, or any combination thereof, which may be executed by a CPU. In addition, various other peripheral units may be connected to the computer platform such as an additional data storage unit and a printing unit.
- It is to be further understood that, because some of the constituent system components and methods depicted in the accompanying drawings are preferably implemented in software, the actual connections between the system components or the process function blocks may differ depending upon the manner in which the present disclosure is programmed. Given the teachings herein, one of ordinary skill in the pertinent art will be able to contemplate these and similar implementations or configurations of the present disclosure.
- Although illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those precise embodiments, and that various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as set forth in the appended claims.
Claims (42)
1. A method of detecting at least one contactless device that has a unique identification code (UID), the method comprising:
requesting transfer of a UID;
receiving at least one positive pulse indicative of a UID; and
detecting whether more than one UID was transferred if the number of positive pulses received exceeds the number expected for one UID.
2. A method as defined in claim 1 wherein the UID comprises at least one byte, each byte being received in the shape of a positive pulse.
3. A method as defined in claim 1 wherein one UID was transferred, the method further comprising activating the device corresponding to the transferred UID.
4. A method as defined in claim 2 wherein more than one UID was detected, the method further comprising:
selecting a first UID byte from the received UID bytes;
requesting transfer of a UID having the selected first UID byte;
receiving at least one positive pulse indicative of a UID; and
detecting whether more than one UID having the selected first UID byte was transferred if the number of positive pulses received exceeds the number expected for one UID.
5. A method as defined in claim 4 wherein one UID having the selected first UID byte was transferred, the method further comprising activating the card corresponding to the transferred UID.
6. A method as defined in claim 4 wherein more than one UID having the selected first UID byte was detected, the method further comprising:
selecting a second UID byte from the received UID bytes;
requesting transfer of a UID having the selected first UID byte and the selected second UID byte;
receiving at least one positive pulse indicative of a UID; and
detecting whether more than one UID having the selected first UID byte and the selected second UID byte was transferred if the number of positive pulses received exceeds the number expected for one UID.
7. A method as defined in claim 6 wherein one UID having the selected first UID byte and the selected second UID byte was transferred, the method further comprising activating the card corresponding to the transferred UID.
8. A method as defined in claim 6 wherein more than one UID having the selected first UID byte and the selected second UID byte was detected, the method further comprising:
selecting another UID byte from the received UID bytes;
requesting transfer of a UID having the selected first UID byte and the selected second UID byte and the selected other UID byte;
receiving at least one positive pulse indicative of a UID; and
detecting whether more than one UID having the selected first UID byte and the selected second UID byte and the selected other UID byte was transferred if the number of positive pulses received exceeds the number expected for one UID.
9. A method as defined in claim 8 wherein one UID having the selected first UID byte and the selected second UID byte and the selected other UID byte was transferred, the method further comprising activating the card corresponding to the transferred UID.
10. A method of identifying a contactless device having a unique identification code (UID) to a reader, the method comprising:
receiving a UID call command from a reader; and
transferring at least one positive pulse indicative of the UID to the reader.
11. A method as defined in claim 10 , further comprising:
receiving an anti-collision command and at least one UID value from a reader; and
if the at least one UID value from the reader matches a corresponding portion of the UID of the device, transferring at least one positive pulse indicative of the UID to the reader.
12. A reader for detecting at least one contactless device that has a unique identification code (UID), the reader comprising:
a UID call commander for requesting transfer of a UID;
a receiver in signal communication with the UID call commander for receiving at least one positive pulse indicative of a UID; and
a detector in signal communication with the receiver for detecting whether more than one UID was transferred if the number of positive pulses received exceeds the number expected for one UID.
13. A reader as defined in claim 12 wherein the UID comprises at least one byte, the receiver disposed for receiving each byte in the shape of a positive pulse.
14. A reader as defined in claim 12 , further comprising an activation unit in signal communication with the detector for activating a contactless device corresponding to a transferred UID.
15. A reader as defined in claim 13 disposed for detecting more than one UID, further comprising:
a byte selector in signal communication with the detector for selecting a UID byte from the received UID bytes; and
an anti-collision commander in signal communication with the byte selector for requesting transfer of a UID having the selected UID byte,
wherein the receiver is disposed for receiving at least one positive pulse indicative of a UID responsive to the anti-collision commander and the detector is disposed for detecting whether more than one UID having the selected UID byte was transferred if the number of positive pulses received exceeds the number expected for one UID.
16. A contactless device comprising:
a memory for storing a unique identification code (UID);
a receiver in signal communication with the memory for receiving a command from a reader;
a command interpreter in signal communication with the receiver for determining whether to transmit the UID; and
a transmitter in signal communication with the memory for transmitting at least one positive pulse indicative of the UID to the reader.
17. A contactless device as defined in claim 16 wherein the command interpreter determines to transmit the UID if a UID call command is received, or if an anti-collision command and at least one UID value are received where the at least one UID value matches a corresponding portion of the UID of the contactless device.
18. A program storage device readable by a machine to execute program steps for detecting at least one contactless device that has a unique identification code (UID), the program steps comprising:
requesting transfer of a UID;
receiving at least one positive pulse indicative of a UID; and
detecting whether more than one UID was transferred if the number of positive pulses received exceeds the number expected for one UID.
19. A program storage device as defined in claim 18 wherein the UID comprises at least one byte, each byte being received in the shape of a positive pulse, and more than one UID was detected, the program steps further comprising:
selecting a UID byte from the received UID bytes;
requesting transfer of a UID having the selected UID byte;
receiving at least one positive pulse indicative of a UID; and
detecting whether more than one UID having the selected UID byte was transferred if the number of positive pulses received exceeds the number expected for one UID.
20. A program storage device readable by a machine to execute program steps for identifying a contactless device having a unique identification code (UID) to a reader, the program steps comprising:
receiving a UID call command from a reader;
transferring at least one positive pulse indicative of the UID to the reader;
receiving an anti-collision command and at least one UID value from a reader; and
if the at least one UID value from the reader matches a corresponding portion of the UID of the card, transferring at least one positive pulse indicative of the UID to the reader.
21. A contactless card, comprising:
a unique identifier comprising a plurality of bytes;
a receiver for receiving an anti-collision command indicative of at least one desired identifier byte;
a comparator in signal communication with the receiver for comparing the at least one desired identifier byte with at least one corresponding byte of the unique identifier; and
a transmitter responsive to the comparator for transmitting the unique identifier as byte-wise positive pulses if the at least one desired identifier byte matches the at least one corresponding byte of the unique identifier.
22. A contactless card as defined in claim 21 , further comprising an interpreter in signal communication with the receiver and the transmitter for recognizing a call command without anti-collision bytes and transmitting the unique identifier as byte-wise positive pulses in response thereto.
23. A contactless card as defined in claim 21 in combination with a reader, the reader comprising:
a transmitter for transmitting an anti-collision command indicative of the at least one desired identifier byte;
a receiver for receiving the unique identifier as byte-wise positive pulses if the at least one desired identifier byte matches the at least one corresponding byte of the unique identifier; and
a detector in signal communication with the receiver for detecting a collision when the number of positive pulses exceeds the number of bytes in the unique identifier.
24. A contactless card reader, comprising:
a transmitter for transmitting an anti-collision command indicative of at least one desired identifier byte;
a receiver for receiving the unique identifier as byte-wise positive pulses if the at least one desired identifier byte matches the at least one corresponding byte of the unique identifier; and
a detector in signal communication with the receiver for detecting a collision when the number of positive pulses exceeds the number of bytes in the unique identifier.
25. A contactless card reader as defined in claim 24 , further comprising:
a caller in signal communication with the transmitter for calling all contactless cards within a given range of the reader;
a memory in signal communication with the receiver for storing in an ordered byte-wise manner all unique identifier bytes received in response to the caller; and
an anti-collision commander in signal communication with the memory and the transmitter for issuing an anti-collision command to differentiate between multiple contactless cards.
26. A contactless card reader as defined in claim 25 wherein the caller calls all contactless cards within a given range of the reader at a periodic interval.
27. A contactless card reader as defined in claim 25 wherein the caller calls all contactless cards within a given range of the reader in response to a passive indication of at least one card.
28. A contactless card reader as defined in claim 25 wherein the memory is configured as a top matrix having a separate column and row for each byte of a unique identifier and having an additional row for each non-duplicate byte entry in any column.
29. A contactless card reader as defined in claim 28 wherein the detector fills in all remaining rightmost byte values for a row with the byte values of a unique identifier for a given card whenever a collision is not detected.
30. A contactless card reader as defined in claim 28 wherein the detector fills in one leftmost of the remaining byte values for a row with a commanded byte value of a unique identifier for a given card whenever a collision matches the existing byte and position.
31. An anti-collision coupling method for contactless cards, the method comprising:
requesting that the cards transmit their unique identifiers, which each comprises a fixed plurality of bytes;
receiving the unique identifiers simultaneously as byte-wise positive pulses;
counting the received positive pulses; and
determining that more than one card responded if the number of received positive pulses exceeds the fixed plurality of bytes.
32. An anti-collision coupling method as defined in claim 31 , further comprising:
initializing a byte position counter;
setting a byte value to a byte value received in the first byte position of the unique identifiers; and
forming an anti-collision command having the byte position counter and the byte value.
33. An anti-collision coupling method as defined in claim 32 , further comprising:
transmitting the anti-collision command comprising the byte position counter and at least one byte value to the cards;
receiving the unique identifiers simultaneously as byte-wise positive pulses;
counting the received positive pulses; and
determining if more than one card responded if the number of received positive pulses exceeds the fixed plurality of bytes.
34. An anti-collision coupling method as defined in claim 33 , further comprising, if more than one card responded:
incrementing the byte position counter;
setting the byte value to a byte value received in the incremented byte position of the unique identifiers;
updating the anti-collision command by updating the byte position counter and adding the byte value; and
repeating the steps of claim 33 .
35. An anti-collision coupling method as defined in claim 33 , further comprising, if only one card responded:
determining that the reader has not called all of the unique identifier bytes corresponding to the current byte position counter;
setting the byte value to another byte value received in the first byte position of the unique identifiers;
updating the anti-collision command with the current byte value; and
repeating the steps of claim 33 .
36. An anti-collision coupling method as defined in claim 33 , further comprising, if only one card responded:
determining that the reader has called all of the unique identifier bytes corresponding to the current byte position counter; and
activating the called cards corresponding to the received unique identifiers.
37. A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform program steps for anti-collision coupling of contactless cards, the program steps comprising:
requesting that the cards transmit their unique identifiers, which each comprises a fixed plurality of bytes;
receiving the unique identifiers simultaneously as byte-wise positive pulses;
counting the received positive pulses; and
determining that more than one card responded if the number of received positive pulses exceeds the fixed plurality of bytes.
38. A program storage device as defined in claim 37 , the program steps further comprising:
initializing a byte position counter;
setting a byte value to a byte value received in the first byte position of the unique identifiers; and
forming an anti-collision command having the byte position counter and the byte value.
39. A program storage device as defined in claim 38 , the program steps further comprising:
transmitting the anti-collision command comprising the byte position counter and at least one byte value to the cards;
receiving the unique identifiers simultaneously as byte-wise positive pulses;
counting the received positive pulses; and
determining if more than one card responded if the number of received positive pulses exceeds the fixed plurality of bytes.
40. A program storage device as defined in claim 39 , the program steps further comprising, if more than one card responded:
incrementing the byte position counter;
setting the byte value to a byte value received in the incremented byte position of the unique identifiers;
updating the anti-collision command by updating the byte position counter and adding the byte value; and
repeating the program steps of claim 39 .
41. A program storage device as defined in claim 39 , the program steps further comprising, if only one card responded:
determining that the reader has not called all of the unique identifier bytes corresponding to the current byte position counter;
setting the byte value to another byte value received in the first byte position of the unique identifiers;
updating the anti-collision command with the current byte value; and
repeating the program steps of claim 39 .
42. A program storage device as defined in claim 39 , the program steps further comprising, if only one card responded:
determining that the reader has called all of the unique identifier bytes corresponding to the current byte position counter; and
activating the called cards corresponding to the received unique identifiers.
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FR0600006A FR2881547B1 (en) | 2005-01-03 | 2006-01-02 | ANTICOLLISION COUPLING FOR NON-CONTACT CARDS |
DE102006000803.0A DE102006000803B4 (en) | 2005-01-03 | 2006-01-03 | Anti-collision coupling procedure |
US12/952,772 US9189665B2 (en) | 2005-01-03 | 2010-11-23 | Anti-collision coupling for contactless cards |
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Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060022042A1 (en) * | 2004-07-15 | 2006-02-02 | Patrick Smets | Collision detection and avoidance scheme for contactless card payment systems |
US20090051496A1 (en) * | 2007-08-22 | 2009-02-26 | Kourosh Pahlavan | Method and Apparatus for Low Power Modulation and Massive Medium Access Control |
US20090127337A1 (en) * | 2007-11-21 | 2009-05-21 | Infineon Technologies Ag | Identification of contactless cards |
US20090165123A1 (en) * | 2007-12-19 | 2009-06-25 | Giobbi John J | Security system and method for controlling access to computing resources |
US20090206992A1 (en) * | 2008-02-14 | 2009-08-20 | Proxense, Llc | Proximity-Based Healthcare Management System With Automatic Access To Private Information |
US20100069039A1 (en) * | 2007-02-28 | 2010-03-18 | Sony Corporation | Storage medium, communication system, and control device |
US20110062233A1 (en) * | 2005-01-03 | 2011-03-17 | Kim Yong-Wook | Anti-collision coupling for contactless cards |
WO2011120241A1 (en) * | 2010-04-02 | 2011-10-06 | 国民技术股份有限公司 | Collision detection method of radio frequency sim card with electromagnetic communication at low frequency |
CN103229189A (en) * | 2010-12-13 | 2013-07-31 | 意法半导体(鲁塞)公司 | Method of managing the dialogue between an item of equipment and at least one multi-application object such as a contactless chip card and corresponding object |
US10698989B2 (en) | 2004-12-20 | 2020-06-30 | Proxense, Llc | Biometric personal data key (PDK) authentication |
US10764044B1 (en) | 2006-05-05 | 2020-09-01 | Proxense, Llc | Personal digital key initialization and registration for secure transactions |
US10769939B2 (en) | 2007-11-09 | 2020-09-08 | Proxense, Llc | Proximity-sensor supporting multiple application services |
US10909229B2 (en) | 2013-05-10 | 2021-02-02 | Proxense, Llc | Secure element as a digital pocket |
US10943471B1 (en) | 2006-11-13 | 2021-03-09 | Proxense, Llc | Biometric authentication using proximity and secure information on a user device |
US11080378B1 (en) | 2007-12-06 | 2021-08-03 | Proxense, Llc | Hybrid device having a personal digital key and receiver-decoder circuit and methods of use |
US11095640B1 (en) | 2010-03-15 | 2021-08-17 | Proxense, Llc | Proximity-based system for automatic application or data access and item tracking |
US11113482B1 (en) | 2011-02-21 | 2021-09-07 | Proxense, Llc | Implementation of a proximity-based system for object tracking and automatic application initialization |
US11120449B2 (en) | 2008-04-08 | 2021-09-14 | Proxense, Llc | Automated service-based order processing |
US20210319440A1 (en) * | 2016-04-12 | 2021-10-14 | Visa Europe Limited | System for performing a validity check of a user device |
US11206664B2 (en) | 2006-01-06 | 2021-12-21 | Proxense, Llc | Wireless network synchronization of cells and client devices on a network |
CN113872643A (en) * | 2021-12-03 | 2021-12-31 | 广州搏创信息科技有限公司 | Anti-collision command processing and responding device |
US11258791B2 (en) | 2004-03-08 | 2022-02-22 | Proxense, Llc | Linked account system using personal digital key (PDK-LAS) |
US11394721B2 (en) * | 2017-01-17 | 2022-07-19 | Visa International Service Association | Binding cryptogram with protocol characteristics |
US11546325B2 (en) | 2010-07-15 | 2023-01-03 | Proxense, Llc | Proximity-based system for object tracking |
US11553481B2 (en) | 2006-01-06 | 2023-01-10 | Proxense, Llc | Wireless network synchronization of cells and client devices on a network |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101337156B1 (en) * | 2006-11-27 | 2013-12-05 | 주식회사 엘지씨엔에스 | Apparatus and method for recognizing a card |
JP2012064709A (en) | 2010-09-15 | 2012-03-29 | Sony Corp | Solid state image pick-up device and electronic device |
CN102955923B (en) * | 2011-08-22 | 2015-12-02 | 深圳市深圳通有限公司 | A kind of method and device preventing communication contention aware |
CN103178907B (en) * | 2011-12-21 | 2016-03-30 | 国民技术股份有限公司 | Improve the method for collision detection success rate |
CN102411721B (en) * | 2011-12-27 | 2013-08-07 | 广州中大微电子有限公司 | Anti-collision circuit of RFID (Radio Frequency Identification Device)tag and realizing method thereof |
CN105809078B (en) * | 2014-12-31 | 2023-03-24 | 国民技术股份有限公司 | Method for preventing repeated payment transaction between different-frequency cards executed by double-frequency card reader and double-frequency card reader |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6388562B1 (en) * | 1998-01-12 | 2002-05-14 | Denso Corporation | Contactless IC card communication system and related method |
US6508400B1 (en) * | 1999-02-10 | 2003-01-21 | Hitachi, Ltd. | Automatic identification equipment and IC cards |
US6564296B2 (en) * | 2000-03-21 | 2003-05-13 | Koninklijke Philips Electronics N.V. | Communication device for rapidly and simultaneously writing onto a plurality of data carriers, and data carrier for such a communication device |
US20030122655A1 (en) * | 1999-12-15 | 2003-07-03 | U.S. Philips Corporation | Short range communication system |
US20050027604A1 (en) * | 1997-11-21 | 2005-02-03 | Matrics, Inc. | System and method for electronic inventory |
US20050058292A1 (en) * | 2003-09-11 | 2005-03-17 | Impinj, Inc., A Delaware Corporation | Secure two-way RFID communications |
US20060145817A1 (en) * | 2004-12-28 | 2006-07-06 | Makoto Aikawa | Radio frequency identification (RFID) tag, portable terminal, and server for RFID tag |
US20080211638A1 (en) * | 2005-11-11 | 2008-09-04 | Fujitsu Limited | Electronic tag and electronic tag system |
US20090160603A1 (en) * | 2007-12-20 | 2009-06-25 | Frederic Bauchot | Locating rfid tags |
Family Cites Families (49)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4686513A (en) * | 1985-09-30 | 1987-08-11 | Sensormatic Electronics Corporation | Electronic surveillance using self-powered article attached tags |
US6010074A (en) * | 1996-04-01 | 2000-01-04 | Cubic Corporation | Contactless proximity automated data collection system and method with collision resolution |
KR19980024746A (en) | 1996-09-19 | 1998-07-06 | 윌리엄 비. 켐플러 | How to create a list of multiple stations |
DE69719722T2 (en) * | 1996-11-13 | 2003-10-23 | Hitachi Ltd | METHOD FOR IDENTIFYING MOVABLE OBJECTS |
FR2760280B1 (en) | 1997-03-03 | 1999-05-21 | Innovatron Ind Sa | METHOD FOR MANAGING COLLISIONS IN A CONTACTLESS DATA EXCHANGE SYSTEM |
FR2774495B1 (en) * | 1998-02-04 | 2000-09-22 | Sgs Thomson Microelectronics | METHOD FOR IDENTIFYING ELECTRONIC CARDS PRESENT IN AN INVESTIGATION AREA |
US6275476B1 (en) * | 1998-02-19 | 2001-08-14 | Micron Technology, Inc. | Method of addressing messages and communications system |
FR2776097B1 (en) * | 1998-03-16 | 2000-08-11 | Sgs Thomson Microelectronics | IMPROVED METHOD FOR IDENTIFYING ELECTRONIC CARDS |
FR2788858B1 (en) * | 1999-01-22 | 2001-03-02 | Gemplus Card Int | MAINTAINING A CHANNEL WITH ANTI-COLLISION IN AN ELECTRONIC IDENTIFICATION SYSTEM |
US6456191B1 (en) * | 1999-03-23 | 2002-09-24 | Exi Wireless Systems Inc. | Tag system with anti-collision features |
DE19949572B4 (en) | 1999-10-14 | 2006-02-16 | Texas Instruments Deutschland Gmbh | Method for identifying multiple transponders |
DE10055602A1 (en) | 1999-12-30 | 2001-07-12 | Ibm | Exit control system for supermarket or department store, produces receipt based on contactlessly received information and updates payment status |
GB2360356A (en) * | 2000-03-18 | 2001-09-19 | Rupert William Meldrum Curwen | Actuating an operation in accordance with location of a transponder |
US20050151654A1 (en) * | 2001-03-07 | 2005-07-14 | R. Curwen | Method and apparatus for actuating an operation |
WO2001070304A1 (en) * | 2000-03-22 | 2001-09-27 | Docusys, Inc. | A drug delivery and monitoring system |
US7049933B1 (en) * | 2000-08-25 | 2006-05-23 | Rf Code, Inc. | Identification device detection using multiple signal combination |
US6549064B2 (en) * | 2001-02-12 | 2003-04-15 | Matrics, Inc. | Efficient charge pump apparatus |
US20020175806A1 (en) * | 2001-05-25 | 2002-11-28 | Marneweck Willem J. | Electronic tag binary selection method |
AU2002334867A1 (en) | 2001-10-17 | 2003-04-28 | Motorola, Inc. | Method and device for data communication in a multi-user system |
US6588670B2 (en) * | 2001-10-30 | 2003-07-08 | Symbol Technologies, Inc. | Medical diagnostic monitoring |
US7084768B2 (en) * | 2002-03-21 | 2006-08-01 | Rf Saw Components, Inc. | Anti-collision interrogation pulse focusing system for use with multiple surface acoustic wave identification tags and method of operation thereof |
DE10227558A1 (en) | 2002-06-20 | 2004-01-15 | Infineon Technologies Ag | System for data exchange between at least two contactless data carriers |
JP3672895B2 (en) * | 2002-07-04 | 2005-07-20 | エル・エス・アイ ジャパン株式会社 | Multiple ID multi-read method |
US7009526B2 (en) * | 2002-10-02 | 2006-03-07 | Battelle Memorial Institute | RFID system and method including tag ID compression |
KR100479326B1 (en) | 2002-10-23 | 2005-03-31 | 한국전자통신연구원 | Apparatus and method for preventing data contact between contactless ic card reader and contactless ic cards |
US6848616B2 (en) * | 2003-03-11 | 2005-02-01 | Zih Corp., A Delaware Corporation With Its Principal Office In Hamilton, Bermuda | System and method for selective communication with RFID transponders |
DE10317257A1 (en) | 2003-04-14 | 2004-11-04 | Giesecke & Devrient Gmbh | Contactless data carrier |
BRPI0411615A (en) * | 2003-06-17 | 2006-08-08 | United Security Appl Id Inc | electronic security system for monitoring and recording activities and data related to people |
AU2003254936B2 (en) * | 2003-08-11 | 2009-05-21 | Hitachi, Ltd. | Reading method, responder, and interrogator |
US7398054B2 (en) * | 2003-08-29 | 2008-07-08 | Zih Corp. | Spatially selective UHF near field microstrip coupler device and RFID systems using device |
EP1667336B1 (en) * | 2003-09-19 | 2013-05-01 | Brother Kogyo Kabushiki Kaisha | Radio tag reader/writer |
US20060017545A1 (en) * | 2004-03-26 | 2006-01-26 | Volpi John P | Radio frequency identification interrogation systems and methods of operating the same |
US7439858B2 (en) * | 2004-06-22 | 2008-10-21 | Paxar Americas, Inc. | RFID printer and antennas |
US7274292B2 (en) * | 2004-06-25 | 2007-09-25 | Intel Corporation | Proximity management system and method using radio-frequency identification tags |
BRPI0513357A (en) * | 2004-07-15 | 2008-05-06 | Mastercard International Inc | contactless payment device system and method for increasing the interoperability of a payment transmission device |
KR101059872B1 (en) * | 2005-01-03 | 2011-08-29 | 삼성전자주식회사 | Communication collision prevention protocol using unique identifier |
US7274284B2 (en) * | 2005-02-04 | 2007-09-25 | Atmel Corporation | Method for RF card detection in a contactless system |
KR100612699B1 (en) * | 2005-03-10 | 2006-08-16 | 에스케이 텔레콤주식회사 | Tag anti-collision rfid system and method for tag identification |
US20060213994A1 (en) * | 2005-03-22 | 2006-09-28 | Faiz Tariq N | Barcode reading apparatus and method therefor |
KR100610358B1 (en) * | 2005-04-18 | 2006-08-09 | 삼성전자주식회사 | Rfid reader and tag and system and method for identifying tag using bit synchronize signal |
US7604178B2 (en) * | 2005-05-11 | 2009-10-20 | Intelleflex Corporation | Smart tag activation |
KR100615704B1 (en) * | 2005-06-01 | 2006-08-25 | 삼성전자주식회사 | Id anti-collision method and rfid system therof |
KR100682062B1 (en) * | 2005-06-23 | 2007-02-15 | 삼성전자주식회사 | RFID System and method for resolving RFID tags collision |
KR100693006B1 (en) * | 2005-07-26 | 2007-03-12 | 삼성전자주식회사 | ID anti-collision method using data structure to be applied to RFID system |
KR100936893B1 (en) * | 2008-01-04 | 2010-01-14 | 중앙대학교 산학협력단 | Method for identification of tags and anti-collision, and RFID tag using the same |
DE102008053369A1 (en) * | 2008-10-27 | 2010-04-29 | Giesecke & Devrient Gmbh | A method for challenge-response authentication between a reader and a transponder based on a contactless data transmission |
CN101739539B (en) * | 2008-11-06 | 2011-09-21 | 国民技术股份有限公司 | Method for resisting car reading conflict by automatic frequency hopping |
TWI410874B (en) * | 2009-01-07 | 2013-10-01 | Mstar Semiconductor Inc | Method for searching a plurality of rfid tags and apparatus thereof |
US20120313761A1 (en) * | 2011-01-06 | 2012-12-13 | John Rolin | Power Management for an Active RFID Tag in Credit Card Form Factor |
-
2005
- 2005-01-03 KR KR1020050000278A patent/KR101059872B1/en active IP Right Grant
- 2005-12-13 US US11/301,549 patent/US20060144943A1/en not_active Abandoned
-
2010
- 2010-11-23 US US12/952,772 patent/US9189665B2/en active Active
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050027604A1 (en) * | 1997-11-21 | 2005-02-03 | Matrics, Inc. | System and method for electronic inventory |
US6388562B1 (en) * | 1998-01-12 | 2002-05-14 | Denso Corporation | Contactless IC card communication system and related method |
US6508400B1 (en) * | 1999-02-10 | 2003-01-21 | Hitachi, Ltd. | Automatic identification equipment and IC cards |
US6527177B1 (en) * | 1999-02-10 | 2003-03-04 | Hitachi, Ltd. | Automatic identification equipment and IC cards |
US20030122655A1 (en) * | 1999-12-15 | 2003-07-03 | U.S. Philips Corporation | Short range communication system |
US6564296B2 (en) * | 2000-03-21 | 2003-05-13 | Koninklijke Philips Electronics N.V. | Communication device for rapidly and simultaneously writing onto a plurality of data carriers, and data carrier for such a communication device |
US20050058292A1 (en) * | 2003-09-11 | 2005-03-17 | Impinj, Inc., A Delaware Corporation | Secure two-way RFID communications |
US20060145817A1 (en) * | 2004-12-28 | 2006-07-06 | Makoto Aikawa | Radio frequency identification (RFID) tag, portable terminal, and server for RFID tag |
US7737824B2 (en) * | 2004-12-28 | 2010-06-15 | Hitachi, Ltd. | Radio frequency identification (RFID) tag, portable terminal, and server for RFID tag |
US20080211638A1 (en) * | 2005-11-11 | 2008-09-04 | Fujitsu Limited | Electronic tag and electronic tag system |
US20090160603A1 (en) * | 2007-12-20 | 2009-06-25 | Frederic Bauchot | Locating rfid tags |
Cited By (51)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11258791B2 (en) | 2004-03-08 | 2022-02-22 | Proxense, Llc | Linked account system using personal digital key (PDK-LAS) |
US11922395B2 (en) | 2004-03-08 | 2024-03-05 | Proxense, Llc | Linked account system using personal digital key (PDK-LAS) |
US20080191031A1 (en) * | 2004-07-15 | 2008-08-14 | Patrick Smets | Reference equipment for testing contactless payment devices |
US20060022042A1 (en) * | 2004-07-15 | 2006-02-02 | Patrick Smets | Collision detection and avoidance scheme for contactless card payment systems |
US7717346B2 (en) * | 2004-07-15 | 2010-05-18 | Mastercard International Incorporated | Collision detection and avoidance scheme for contactless card payment systems |
US7775445B2 (en) | 2004-07-15 | 2010-08-17 | Mastercard International Incorporated | Reference equipment for testing contactless payment devices |
US10698989B2 (en) | 2004-12-20 | 2020-06-30 | Proxense, Llc | Biometric personal data key (PDK) authentication |
US20110062233A1 (en) * | 2005-01-03 | 2011-03-17 | Kim Yong-Wook | Anti-collision coupling for contactless cards |
US9189665B2 (en) * | 2005-01-03 | 2015-11-17 | Samsung Electronics Co., Ltd. | Anti-collision coupling for contactless cards |
US11212797B2 (en) | 2006-01-06 | 2021-12-28 | Proxense, Llc | Wireless network synchronization of cells and client devices on a network with masking |
US11800502B2 (en) | 2006-01-06 | 2023-10-24 | Proxense, LL | Wireless network synchronization of cells and client devices on a network |
US11219022B2 (en) | 2006-01-06 | 2022-01-04 | Proxense, Llc | Wireless network synchronization of cells and client devices on a network with dynamic adjustment |
US11206664B2 (en) | 2006-01-06 | 2021-12-21 | Proxense, Llc | Wireless network synchronization of cells and client devices on a network |
US11553481B2 (en) | 2006-01-06 | 2023-01-10 | Proxense, Llc | Wireless network synchronization of cells and client devices on a network |
US11551222B2 (en) | 2006-05-05 | 2023-01-10 | Proxense, Llc | Single step transaction authentication using proximity and biometric input |
US11157909B2 (en) | 2006-05-05 | 2021-10-26 | Proxense, Llc | Two-level authentication for secure transactions |
US11182792B2 (en) | 2006-05-05 | 2021-11-23 | Proxense, Llc | Personal digital key initialization and registration for secure transactions |
US10764044B1 (en) | 2006-05-05 | 2020-09-01 | Proxense, Llc | Personal digital key initialization and registration for secure transactions |
US10943471B1 (en) | 2006-11-13 | 2021-03-09 | Proxense, Llc | Biometric authentication using proximity and secure information on a user device |
US20100069039A1 (en) * | 2007-02-28 | 2010-03-18 | Sony Corporation | Storage medium, communication system, and control device |
US8314688B2 (en) * | 2007-08-22 | 2012-11-20 | Tagarray, Inc. | Method and apparatus for low power modulation and massive medium access control |
US20090051496A1 (en) * | 2007-08-22 | 2009-02-26 | Kourosh Pahlavan | Method and Apparatus for Low Power Modulation and Massive Medium Access Control |
US11562644B2 (en) | 2007-11-09 | 2023-01-24 | Proxense, Llc | Proximity-sensor supporting multiple application services |
US10769939B2 (en) | 2007-11-09 | 2020-09-08 | Proxense, Llc | Proximity-sensor supporting multiple application services |
US20090127337A1 (en) * | 2007-11-21 | 2009-05-21 | Infineon Technologies Ag | Identification of contactless cards |
US8905312B2 (en) | 2007-11-21 | 2014-12-09 | Infineon Technologies Ag | Identification of contactless cards |
US11080378B1 (en) | 2007-12-06 | 2021-08-03 | Proxense, Llc | Hybrid device having a personal digital key and receiver-decoder circuit and methods of use |
US10469456B1 (en) | 2007-12-19 | 2019-11-05 | Proxense, Llc | Security system and method for controlling access to computing resources |
US11086979B1 (en) | 2007-12-19 | 2021-08-10 | Proxense, Llc | Security system and method for controlling access to computing resources |
US20090165123A1 (en) * | 2007-12-19 | 2009-06-25 | Giobbi John J | Security system and method for controlling access to computing resources |
US9251332B2 (en) | 2007-12-19 | 2016-02-02 | Proxense, Llc | Security system and method for controlling access to computing resources |
US10971251B1 (en) | 2008-02-14 | 2021-04-06 | Proxense, Llc | Proximity-based healthcare management system with automatic access to private information |
US8508336B2 (en) * | 2008-02-14 | 2013-08-13 | Proxense, Llc | Proximity-based healthcare management system with automatic access to private information |
US20090206992A1 (en) * | 2008-02-14 | 2009-08-20 | Proxense, Llc | Proximity-Based Healthcare Management System With Automatic Access To Private Information |
US11727355B2 (en) | 2008-02-14 | 2023-08-15 | Proxense, Llc | Proximity-based healthcare management system with automatic access to private information |
US11120449B2 (en) | 2008-04-08 | 2021-09-14 | Proxense, Llc | Automated service-based order processing |
US11095640B1 (en) | 2010-03-15 | 2021-08-17 | Proxense, Llc | Proximity-based system for automatic application or data access and item tracking |
CN102215050A (en) * | 2010-04-02 | 2011-10-12 | 国民技术股份有限公司 | Detection method for radio-frequency SIM (Subscriber Identity Module) card collision with low-frequency magnetic communication |
US9076051B2 (en) | 2010-04-02 | 2015-07-07 | Nationz Technologies Inc. | Collision detection method for a radio-frequency SIM card with low-frequency magnetic communication |
WO2011120241A1 (en) * | 2010-04-02 | 2011-10-06 | 国民技术股份有限公司 | Collision detection method of radio frequency sim card with electromagnetic communication at low frequency |
US11546325B2 (en) | 2010-07-15 | 2023-01-03 | Proxense, Llc | Proximity-based system for object tracking |
CN103229189A (en) * | 2010-12-13 | 2013-07-31 | 意法半导体(鲁塞)公司 | Method of managing the dialogue between an item of equipment and at least one multi-application object such as a contactless chip card and corresponding object |
US11113482B1 (en) | 2011-02-21 | 2021-09-07 | Proxense, Llc | Implementation of a proximity-based system for object tracking and automatic application initialization |
US11669701B2 (en) | 2011-02-21 | 2023-06-06 | Proxense, Llc | Implementation of a proximity-based system for object tracking and automatic application initialization |
US11132882B1 (en) | 2011-02-21 | 2021-09-28 | Proxense, Llc | Proximity-based system for object tracking and automatic application initialization |
US10909229B2 (en) | 2013-05-10 | 2021-02-02 | Proxense, Llc | Secure element as a digital pocket |
US11914695B2 (en) | 2013-05-10 | 2024-02-27 | Proxense, Llc | Secure element as a digital pocket |
US20210319440A1 (en) * | 2016-04-12 | 2021-10-14 | Visa Europe Limited | System for performing a validity check of a user device |
US11720889B2 (en) * | 2016-04-12 | 2023-08-08 | Visa Europe Limited | System for performing a validity check of a user device |
US11394721B2 (en) * | 2017-01-17 | 2022-07-19 | Visa International Service Association | Binding cryptogram with protocol characteristics |
CN113872643A (en) * | 2021-12-03 | 2021-12-31 | 广州搏创信息科技有限公司 | Anti-collision command processing and responding device |
Also Published As
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KR20060079806A (en) | 2006-07-06 |
KR101059872B1 (en) | 2011-08-29 |
US9189665B2 (en) | 2015-11-17 |
US20110062233A1 (en) | 2011-03-17 |
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