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WO2007038348A1 - Systeme de porte de plate-forme fiable utilisant des interrogateurs d'identification par radiofrequence - Google Patents

Systeme de porte de plate-forme fiable utilisant des interrogateurs d'identification par radiofrequence Download PDF

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Publication number
WO2007038348A1
WO2007038348A1 PCT/US2006/037115 US2006037115W WO2007038348A1 WO 2007038348 A1 WO2007038348 A1 WO 2007038348A1 US 2006037115 W US2006037115 W US 2006037115W WO 2007038348 A1 WO2007038348 A1 WO 2007038348A1
Authority
WO
WIPO (PCT)
Prior art keywords
radio frequency
frequency identification
dock door
stationary
door system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2006/037115
Other languages
English (en)
Inventor
Li-Cheng Zai
Sophia Liu
Xinyu Zang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ADTECH RFID Inc
Original Assignee
ADTECH RFID Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ADTECH RFID Inc filed Critical ADTECH RFID Inc
Publication of WO2007038348A1 publication Critical patent/WO2007038348A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
    • G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisions for transferring data to distant stations, e.g. from a sensing device

Definitions

  • This invention relates generally to Radio Frequency Identification (RFID) systems and methods for inventory management and tracking, and, more particularly, to a reliable dock-door system using RFID interrogators.
  • RFID Radio Frequency Identification
  • RFID systems Since the first demonstration of a modern RFID system in the early 1970s, the development of RFID systems have expanded tremendously. This significant development is not unwarranted, RFID systems provide an automatic method for authenticating or identifying an RFID tagged object or person.
  • RFID systems operate under the same general principle.
  • Data is transmitted from a mobile device, called a tag, to a reader, which receives the transmitted signal and sends it to a device for processing.
  • Data transmitted from the tag may include information regarding the location of the tag or specifics of the tagged item, such as its identity, price, or transaction history.
  • Most modem RFID systems are passive, wherein the RFID tags store data on a digital memory chip, containing some form of non-volatile memory such as EEPROM, coupled to a transponder with no internal power supply.
  • a passive RFID system an interrogator emits a radiofrequency signal that induces a small amount of current in the tag. This current is sufficient to activate the digital memory chip of the tag, which backscatters a response signal to a receiving antenna of the RFID system.
  • a processor can then process the signal received from the RFID tag to read the data on the tag.
  • the RFID system may also write data to the digital memory chip through the RFID interrogators.
  • RFID systems are already widely used in a variety of markets. Some of these markets include: inventory tracking, identification, such as in passports or implants, automated payment systems at subways, gas stations or stores, and access control systems in office buildings and other secured sites.
  • RFlD systems may be used at a loading dock door to track goods entering or leaving the inventory of a store, or warehouse.
  • a typical prior art dock door RFID system is shown in FIG. 1.
  • the prior art RFID dock door system has a stationary RFID reader 11 coupled to a plurality of antennae 12, 13, 14, and 15. Multiple antennae are needed because the range of a response signal from a passive RFID tag is only two to three meters.
  • the RFID tag responds to the signal from an RFID interrogator. This response signal is received by one or more of the plurality of antennae and forwarded to the RFID reader.
  • the RFID reader may include a processor to process the signal, or the RFID system may be tied directly to a computer that automatically updates the inventory record according to the signals received by the RFID system.
  • the current invention provides this functionality through a combination of stationary and portable RFID interrogators, audio visual alert devices, and at least one control program running on a computing device.
  • the stationary and/or portable RFID readers detect RFID data at a loading dock door and transmit this data to the control program running on the computing device.
  • the control program monitors the tag data detected at the dock doors and compares them with already existing data stored locally or on a backend information system.
  • an exception condition occurs (e.g., the tag data do not agree with the stored data)
  • the control program sends an "Exception" command to the audio and visual devices at the dock door and to the portable RFID reader.
  • the audio visual devices indicate to a user that an exception condition has occurred, and provide instructions for resolving the exception condition.
  • a user may then take the appropriate steps for resolving the condition, such as entering correct data, replacing a missing or malfunctioning RFID tag, or handling the item according to special handling instructions which can be displayed on the audio visual device (e.g., an LCD or CRT screen).
  • special handling instructions can be displayed on the audio visual device (e.g., an LCD or CRT screen).
  • the control program can send a "Complete" command to the audio visual devices indicating that no further action is necessary. In this manner, RFID tagged items can be effectively tracked, processed and handled at the loading dock doors of a facility.
  • FIGURE 1 is an illustration of a prior art RFID dock door system.
  • FIGURE 2 is an illustration of one embodiment of an RFID dock door system as contemplated by the current invention.
  • FIGURE 3 is a hardware block diagram of an individual dock door within the inventive RFID dock door system.
  • FIGURE 4 is a sequence diagram for inventory tracking in one embodiment of the inventive dock door RFID system.
  • FIGURE 5 is a top view of a portable RFID interrogator of the inventive RFID dock door system.
  • FIGURE 6 is a sequence diagram for controlling the user interface of the portable RFID interrogator of the inventive RFID dock door system.
  • FIGURE 7 is a sequence diagram for controlling the user interface of the portable RFID interrogator of the inventive RFID dock door system.
  • FIGURE 8 is a sequence diagram for automatic association of a portable RFID interrogator with a dock door equipped with stationary RFID interrogators of the inventive RFID dock door system.
  • the following description is provided to enable any person skilled in the art to make and use the invention and sets forth the best modes contemplated by the inventor of carrying out their invention.
  • the the current invention is directed to a dock door RFID system for tracking inventory and a method of using the system.
  • the RFID dock door system 20 may comprise a plurality of dock doors 21-1 to 21 -n.
  • the RFID components of each dock door are connected to a computing device 23 and wireless access point 24 via a network backbone 26.
  • the computing device 23 processes signals from the RFID readers 31 within the RFID dock door system 20 to track inventory and store related data.
  • the wireless access point 24 provides a connection between the network backbone 26 and a plurality of portable RFID readers 22-1 to 22-m.
  • the RFID dock door systems at different physical locations can be connected via the network backbone allowing a user to track inventory or tagged items at different physical locations. For instance, if the dock door RFID systems for manufacturing plants making a specific part, or in a specific region, were connected via the network backbone 26, a user coXild track inventory movement over a particular region, or for a specific part, product or process. This improved tracking capability allows a user to more effectively and efficiently manage the assets/inventory moving within their manufacturing or distribution system.
  • the components of the RFID dock door system may be connected via data means other than a traditional network backbone.
  • components of the RFID dock door system could be directly connected to one another, or connected via a bus, star, ring, mesh or bus-ring network.
  • the connection between the components can also vary, including: serial connections, parallel connections, or wireless connections.
  • the system may be comprised only of a single dock door having RFID components 30 connected to a computing device 23 and a wireless access point 24 via a network backbone 26, and at least one portable RFID reader connected to the network backbone 26 via a wireless connection.
  • each tagged item can be given a unique identifier that corresponds to information relating to the item in a spreadsheet, table, or other data format usually populated by a back end information system (e.g., a Manufacturing Resource Planning (MRP) system).
  • MRP Manufacturing Resource Planning
  • the computing device 23 Upon receiving a signal corresponding to a unique identifier from the RFID reader 31 , the computing device 23 attempts to find the item specific data in the table or spreadsheet and update the data, depending on the signal received from the RFID reader 31, or send it to a different application, along with the processed RFID signal, for further processing.
  • FIG. 3 A hardware block diagram for an individual RFID dock door 30 is depicted in FIG. 3.
  • each dock door includes a plurality of antennae 32-35, an RFID reader 31, and one or more audio visual alert device(s) 36.
  • the RFID reader 31 is a stationary reader positioned near the dock door. As a tagged item enters the area of the dock door, the antennae 32-35, pick up the backscattered signal from the RFID tag on the tagged item and send the signal to the RFID reader 31.
  • the RFID reader can process the tag's signal to derive the unique identifier for the tagged item, or, alternatively, the RFID reader 31 can send the data to the computing device 23 across the network backbone 26.
  • the audio visual alert device(s) 36 can alert the person that there is information regarding the tagged item and display the information.
  • a portable RFID reader 22 can then be associated with the stationary RFID reader 31 to clear the error message or otherwise indicate that the special handling instructions have been complied with.
  • FIGURE 4 diagrams one possible sequence followed by the RFID dock door system 20 while tracking or processing a tagged item.
  • control software S1 running on at least one computing device 23 sends a command to at least one stationary reader 31 at a dock door indicating that it should read the RFID tag of a tagged item. If the dock door has more than one RFID reader 31, the control software may send a command to both RFID readers S2, S3 to ensure the tagged item is correctly processed.
  • the stationary RFID reader(s) 31 read the RFID tag(s) of a tagged item, and send the data back to the control software S1 running on the at least one computing device 23 at step 42.
  • the control software S1 compares the data with information stored on a local table/spreadsheet (often from a back end information system) or sends the data to a back end information system for comparison. If the data received from the RFID tag matches the data stored on the system, and there are no special handling instructions, then the task is complete and the information stored on the table can be updated, can be used to route the tagged item, or in some cases no further action is be taken.
  • a local table/spreadsheet often from a back end information system
  • step 43 if the data from the information system does not match the data from the tagged item, or if there are special handling instructions, a "Task Incomplete" event occurs, and the control software S1 sends an "Exception XYZ" command to the stationary RFID reader 31 and a portable RFID reader 22.
  • Each reader then turns on the audio visual indicators based on the specific case represented by the label XYZ; it will be appreciated that the audio visual indicators can also be directly controlled by the control software S1 depending on the implementation of the inventive system.
  • the person handling the tagged item is, in turn, alerted by the audio visual indicators on either the stationary reader 31 or the portable reader 22 of the "Task Incomplete" event.
  • the control software can send instructions for related to the "Task Incomplete” event, such as special handling instructions, to the audio visual indicators of the stationary or portable RFID readers.
  • the person handling the tagged item may then read these instructions and resolve the "Task Incomplete” event, either by physically correcting the exception condition, following the handling instructions, or entering required information.
  • the person handling the tagged item can actuate a trigger or button on the portable RFID reader 22 to resend the data corresponding to the tagged item, and indicate to the RFID dock door system 20 that the instructions for dealing with the "Task Incomplete” event have been followed.
  • control software S1 analyzes the newly collected data and sends a "Complete” command to the stationary and portable RFID readers 22, 31.
  • the pallet has an RFID tag and each part in the assembly also contains a unique RFID tag.
  • the correct individual tags should also be detected. However, due the possible errors just mentioned, the correct combination of individual tags may not be detected. In that case human intervention is required.
  • the portable reader 22 can be used to directly interrogate the pallet tag (if one can be found — if the tag is missing, it can be manually replaced, thereby correcting the error). If direct interrogation does not yield the expected pallet tag data, there may be an erroneous placement of pallet RFID tags. If the pallet tag is correct, then each part of the assembly can be inspected to ensure the presence of an RFID tag and that tag can be interrogated to verify that it produces the correct data. Missing or incorrect tags can be replaced or the entire pallet can be sent to another department for correction.
  • a portable RFID reader 22 takes the form of a hand-held device as shown in FiG. 5.
  • the top panel of the portable RFID reader 22 includes a LED section 51, a display section 52 and a keypad section 53.
  • the LED section 51 may include LEDs corresponding to specific events, such as an okay (OK) LED 51-1, a message (MSG) LED 51-2, and a task (TASK) LED 51-3. These LEDs may indicate a specific task state to the handler of a tagged item.
  • the display section 52 can display messages or instructions regarding a specific task state, and the user may enter information corresponding to a specific task state via the keypad 53.
  • FIGURE 6 depicts a sequence for controlling the okay 51-1 and task 51-3 LEDs of a portable RFID reader 22.
  • the control software S1 sends the "Exception XYZ" command to the portable RFID reader 22.
  • the task LED 51-3 of the portable RFID reader 22 lights up, indicating a task state, and information regarding the specific exception condition is displayed on the display 52 of the portable RFID reader 22.
  • a user physically clears the exception conditions, if necessary, and actuates the trigger of the portable reader to collect new data from the tagged item.
  • the control software S1 detects that a task is in process after receiving new tag data, and sends an "In Progress" command to be displayed on the display 52 of the portable RFID reader 22.
  • the control software S1 analyzes the newly collected data and sends a "Complete" command to be displayed on the display 52 of the portable RFID reader 22.
  • the okay 51-1 LED may also be actuated providing further indication that the exception conditions have been resolved.
  • the dock door system can use several classes of messages to effectively communication between the user and the control software S1.
  • One class of message can be a temporary message that stays on the display 52 for a short period of time and is typically used for instructional use, such as "look for pallet tag" and "pull trigger”.
  • a second class of message is a persistent message, that remains on the display 52 indefinitely until the operator acknowledges and clears it. Messages for a new task list or exception job handling typically fall under the persistent class of messages.
  • FIGURE 7 shows a sequence diagram for controlling the Message LED 51-2 of the portable RFID reader 22.
  • control software S1 sends a "Temporary MSG” command to the portable RFID reader 22 that controls the message LED 51-2 and display 52 of the portable RFID reader. Alerted by the message LED 51-2, the user then reads the temporary message on the display. In one embodiment, the "Temporary MSG” command may also trigger an audio cue to alert a user to a message.
  • the control software S1 sends a "Persistent MSG" command to the portable RFID reader 22 that controls the message LED 51-2 and the portable RFID reader's display 52.
  • the user is alerted by the message LED 51-2 that a message has been sent, and can read the message on the display 52 of the portable RFID reader 22.
  • the operator presses a MSG key to view and clear a message received from the control software. If there is no "Temporary” or "Persistent” message from the control software S1, the control software S1 sends the portable RFID reader 22 a "No MSG" command to the reader 22 that controls the message LED 51-2 and display.
  • the inventive RFID dock door system 20 includes at least one portable RFID reader 22. Because one embodiment of the RFID dock door system includes a plurality of dock doors, a given portable RFID reader must be able to associate itself with a number of different the stationary RFID readers 31 at a particular dock door 21 -n within the RFID dock door system 20.
  • the portable RFID reader S5 may associate with the stationary RFID readers S2, S3 of a particular dock door, as shown in FIG. 8, through a program on the control software S1, or, by accessing the network backbone 26 through a wireless access point at a particular dock door within the RFID dock door system 20.
  • the portable RFID reader S5 associates with stationary RFID readers S2, S3 after sending data regarding an RFID tagged object to the control software S1.
  • the control software S1 compares the tag data sent from the portable RFID reader S5 with tag data sent from stationary RFID readers S2 to SN, and, when there is a match, the control software S1 associates the portable RFID reader S5 with the stationary RFID reader(s) S2, S3 that sent the matching tag data.
  • FIG 8 depicts a sequence diagram for the automatic association of a portable RFID reader 22 with a stationary RFID reader 31 at a dock door 21 -n.
  • control software S1 sends "Read Tag" commands to a first stationary reader S2 and a second stationary reader S3, so that the two readers start to read the RFID tags of a tagged item.
  • both the first stationary RFID reader S2 and the second stationary RFID reader S3 send the collected tag data back to the control software S1, which compares the collected data with data stored locally on the computing device 23, or on some other back end information system.
  • data corresponding to the tagged item may be updated, the tagged item may be cleared, or there may be an indication to the user that further action is required.
  • step 83 If further action is required, as shown in step 83, a "Task Incomplete" event occurs, and the control software S1 sends an "Exception XYZ" command to the stationary RFID readers S2, S3, and any portable RFID readers S5 associated with the particular dock door. Each reader, S2, S3, S5, then turns on their audio visual indicators to alert the user to the exception event.
  • step 84 the user reads the instructions sent by the control software S1, and, if necessary, takes further action to clear the exception event.
  • the portable RFID reader S5 can associate with the stationary RFID readers S2, S3 at this point if it has not already.
  • the user can pull the trigger of the portable RFID reader 22 to send a new data set regarding the tagged item to the control software S1.
  • the control software S1 determines that no further action is required, and, at 86, the control software S1 sends a "Complete" command to the RFID readers S2, S3, and S5, indicating to the user that no further action is required.
  • the portable RFID reader S5 can then disassociate itself from the RFID readers at that particular dock door.
  • a portable RFID reader 22 can associate itself with a particular dock door by simply reading an RFID tag of a already correctly read (by the stationary RFID readers) tagged item at the dock door.
  • the control software compares the data with the correct data already sent from stationary RFID readers S2, S3 and, if the data match, associates the portable RFID reader S5 with those stationary RFID readers S2 and S3.
  • a single portable RFID reader 22 can be used to receive and clear exception conditions for a tagged item at multiple dock doors.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Warehouses Or Storage Devices (AREA)

Abstract

La présente invention concerne un système de porte de plate-forme de chargement utilisant des lecteurs d'identification par radiofréquence (RFID), lequel système constitue un système de porte de plate-forme efficace et fiable. L'utilisation d'un ou de plusieurs interrogateurs RFID portables, conjointement avec un ou plusieurs lecteurs RFID fixes, permet de gérer efficacement et convenablement des conditions d'exception apparaissant au niveau des diverses portes de plate-forme de chargement. Le système de porte de plate-forme RFID décrit dans cette invention comprend au moins un lecteur RFID fixe et au moins une lecteur RFID portable, un dispositif d'alarme audiovisuelle, et au moins un programme de commande exécuté sur un dispositif informatique. Le programme de commande contrôle les données d'étiquette détectées au niveau des portes de la plate-forme puis il les compare avec les données stockées localement ou se trouvant sur un système d'information d'arrière-plan. Lorsqu'une condition d'exception apparaît, le programme de commande envoie une commande 'exception' aux dispositifs audiovisuels placés sur la porte de la plate-forme et au lecteur RFID portable. Des instructions permettant de résoudre la condition d'exception peuvent être affichées à l'attention d'un utilisateur sur l'écran d'affichage du lecteur RFID fixe ou sur l'écran d'affichage du lecteur RFID portable. S'il n'y a aucune condition d'exception, ou encore, si une condition d'exception a été résolue par un utilisateur, le programme de commande envoie une commande 'terminé' aux dispositifs audiovisuels indiquant qu'aucune action supplémentaire n'est nécessaire.
PCT/US2006/037115 2005-09-23 2006-09-22 Systeme de porte de plate-forme fiable utilisant des interrogateurs d'identification par radiofrequence Ceased WO2007038348A1 (fr)

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US72015605P 2005-09-23 2005-09-23
US60/720,156 2005-09-23

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011114736A1 (de) 2011-03-18 2012-09-20 Hörmann KG Antriebstechnik Ladestellen mit RFID
US20130175339A1 (en) * 2012-01-09 2013-07-11 Michael P. Svetal Using a mobile device to assist in exception handling in self-checkout and automated data capture systems
CN106488286A (zh) * 2015-08-28 2017-03-08 上海欢众信息科技有限公司 云端信息收集系统
US10055626B2 (en) 2016-12-06 2018-08-21 Datalogic Usa, Inc. Data reading system and method with user feedback for improved exception handling and item modeling
US10430776B2 (en) 2014-01-09 2019-10-01 Datalogic Usa, Inc. System and method for exception handling in self-checkout and automated data capture systems

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Publication number Priority date Publication date Assignee Title
US20010000019A1 (en) * 1997-07-24 2001-03-15 Bowers John H. Inventory system using articles with RFID tags
WO2002061657A1 (fr) * 2001-01-31 2002-08-08 R.A. Phillips Industries, Inc. Gestion de cargaison de camion au moyen d'etiquettes d'identification par radio-frequence et d'interrogateurs
US20030034390A1 (en) * 2000-10-20 2003-02-20 Linton William A. Radio frequency identification method and system of distributing products
US20050197844A1 (en) * 2004-03-02 2005-09-08 Ng Joseph S. Network-centric cargo security system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010000019A1 (en) * 1997-07-24 2001-03-15 Bowers John H. Inventory system using articles with RFID tags
US20030034390A1 (en) * 2000-10-20 2003-02-20 Linton William A. Radio frequency identification method and system of distributing products
WO2002061657A1 (fr) * 2001-01-31 2002-08-08 R.A. Phillips Industries, Inc. Gestion de cargaison de camion au moyen d'etiquettes d'identification par radio-frequence et d'interrogateurs
US20050197844A1 (en) * 2004-03-02 2005-09-08 Ng Joseph S. Network-centric cargo security system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011114736A1 (de) 2011-03-18 2012-09-20 Hörmann KG Antriebstechnik Ladestellen mit RFID
US20130175339A1 (en) * 2012-01-09 2013-07-11 Michael P. Svetal Using a mobile device to assist in exception handling in self-checkout and automated data capture systems
US9082142B2 (en) * 2012-01-09 2015-07-14 Datalogic ADC, Inc. Using a mobile device to assist in exception handling in self-checkout and automated data capture systems
US10430776B2 (en) 2014-01-09 2019-10-01 Datalogic Usa, Inc. System and method for exception handling in self-checkout and automated data capture systems
CN106488286A (zh) * 2015-08-28 2017-03-08 上海欢众信息科技有限公司 云端信息收集系统
US10055626B2 (en) 2016-12-06 2018-08-21 Datalogic Usa, Inc. Data reading system and method with user feedback for improved exception handling and item modeling

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