WO2009048307A2 - Lecteur rfid mobile et procédé de communication rfid utilisant une horloge système partagée - Google Patents

Lecteur rfid mobile et procédé de communication rfid utilisant une horloge système partagée Download PDF

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Publication number
WO2009048307A2
WO2009048307A2 PCT/KR2008/006011 KR2008006011W WO2009048307A2 WO 2009048307 A2 WO2009048307 A2 WO 2009048307A2 KR 2008006011 W KR2008006011 W KR 2008006011W WO 2009048307 A2 WO2009048307 A2 WO 2009048307A2
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WO
WIPO (PCT)
Prior art keywords
mobile
rfid
clock
rfid reader
burst
Prior art date
Application number
PCT/KR2008/006011
Other languages
English (en)
Other versions
WO2009048307A3 (fr
Inventor
Chan-Won Park
Nak-Seon Seong
Josef Preishuber-Pfluegl
David Tschische
Gil-Young Choi
Cheol-Sig Pyo
Jong- Suk Chae
Original Assignee
Electronics And Telecommunications Research Institute
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
Priority claimed from KR1020080078120A external-priority patent/KR20090037798A/ko
Application filed by Electronics And Telecommunications Research Institute filed Critical Electronics And Telecommunications Research Institute
Priority to US12/682,313 priority Critical patent/US20100207736A1/en
Publication of WO2009048307A2 publication Critical patent/WO2009048307A2/fr
Publication of WO2009048307A3 publication Critical patent/WO2009048307A3/fr

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Classifications

    • 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

Definitions

  • the present invention relates to a mobile radio frequency identification (RFID) reader, a RFID ⁇ mmunication system, and a RFID ⁇ mmunication method using a shared system clock, and more particularly, to a mobile RFID reader and a RFID ⁇ mmunication method capable of providing accurate timing information so as to be used in a technology for preventing a collision with each different readers.
  • RFID radio frequency identification
  • RFID radio frequency identification
  • the present invention provides a mobile RFID reader and a RFID ⁇ mmunication method capable of providing accurate timing information so as to be used in a technology for preventing a collision with each different reader using a global system for mobile ⁇ mmunications (GSM) based shared system clock.
  • GSM global system for mobile ⁇ mmunications
  • clock for synchronizing the mobile RFID readers can be shared without changing hardware of the conventional RFID device. Also, uplink communication for synchronizing the clock is not required.
  • FIG. 1 schematically illustrates a mobile radio frequency identification (RFID) communication system according to an embodiment of the present invention
  • FIG. 2 illustrates a cell structure in a global system for mobile communication
  • FIG. 3 illustrates frame layers in the GSM according to an embodiment of the present invention
  • FIG. 4 illustrates five burst formats defined in the GSM according to an embodiment of the present invention
  • FIG. 5 illustrates synchronization of a system clock according to an embodiment of the present invention
  • FIG. 6 is a block diagram of a RFID reader included in a mobile station according to an embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a RFID communication method of a mobile RFID reader according to an embodiment of the present invention. Best Mode
  • a mobile radio frequency identification (RFID) reader including: a mobile communication unit generating a clock synchronization signal at a specific pattern of a downlink frame that is broadcasted from a base transceiver station; and a RFID reader unit sharing a system clock with other mobile RFID readers after the system clock is synchronized by the clock synchronization signal .
  • RFID radio frequency identification
  • the mobile RFID reader may further include an interface unit transmitting the clock synchronization signal to the RFID reader unit from the mobile communication unit.
  • the specific pattern of the frame may include information indicating starting of the downlink frame or starting of specific burst forming the frame.
  • the burst may include a normal burst, a synchronization burst, an access burst, a frequency correction bursts, and a durmy bursts.
  • the RFID reader unit may generate a time slot for RFID communication with a tag based on the clock synchronization signal after sharing the system clock with other mobile RFID readers .
  • the base transceiver station may manage a cell to which a portion of frequency spectran covered by an entire network is allocated.
  • the mobile communication unit may ocmmunicate with the base transceiver station using one of communication methods comprising Global System for Mobile communication (GSM), Universal Mobile Telecommunications System (UMTS), Code Division Multiple Access (CDMA), and Wideband-CDMA (W-CDMA).
  • GSM Global System for Mobile communication
  • UMTS Universal Mobile Telecommunications System
  • CDMA Code Division Multiple Access
  • W-CDMA Wideband-CDMA
  • a mobile radio frequency identification (RFID) communication method of a mobile RFID reader including: generating a clock synchronization signal at a specific pattern of a downlink frame that is broadcasted from a base transceiver station; and sharing a system clock with other mobile RFID readers after the system clock is synchronized by the clock synchronization signal .
  • RFID radio frequency identification
  • a mobile radio frequency identification (RFID) ⁇ mmunication system including: a base transceiver station broadcasting a downlink frame according to network protocol; and a mobile RFID reader sharing a system clock with other mobile RFID readers after the system clock is synchronized by a clock synchronization signal generated at a specific pattern of the downlink frame .
  • RFID radio frequency identification
  • FIG. 1 schematically illustrates a mobile radio frequency identification (RFID) ⁇ mmunication system according to an embodiment of the present invention.
  • RFID radio frequency identification
  • the mobile RFID system includes a Mobile communication network base transceiver station (hereinafter, a base transceiver station) and various mobile RFID readers for oommunicating with the base transceiver station.
  • the mobile RFID readers may be RFID readers embedded in a mobile station.
  • the region covered by the base transceiver station may be cells to which specific frequency spectrum of an entire network is allocated.
  • the base transceiver station which manages a cell and the mobile RFID readers in the cell are communicated with each other.
  • timing information shared by all mobile RFID readers included in the region covered by the base transceiver station is provided from the base transceiver station using protocol of an existing network, in order to improve a RFID communication of the mobile RFID readers and to prevent a collision with the RFID readers.
  • the timing information is based on a frame concept and is transmitted to a RFID logic from a mobile ⁇ mmunication logic of the mobile RFID reader.
  • the base transceiver station broadcasts downlink burst frames according to protocols of a network standard.
  • the mobile reader detects a specific pattern that is previously agreed in the received burst frame and synchronizes a system clock with the base transceiver station based on the detected pattern, thereby sharing the system clock with other mobile RFID reader.
  • the present invention can be applied to an arbitrary base transceiver station based network standard using the frame concept, that is, Global System for Mobile communication (GSM), Universal Mobile Telecommunications System (UMTS), Code Division Multiple Access (CDMA), and Wideband-CDMA (W-CDMA).
  • GSM Global System for Mobile communication
  • UMTS Universal Mobile Telecommunications System
  • CDMA Code Division Multiple Access
  • W-CDMA Wideband-CDMA
  • FIG. 2 illustrates a cell structure in the GSM according to an embodiment of the present invention.
  • a cell structure is used to divide usable frequency ranges and only a portion of frequency spectrum is respectively allocated to all base transceiver stations (BTS).
  • BTS base transceiver stations
  • the range of the BTS is limited to a fixed region. Accordingly, the frequency can be re-used by such properties in the GSM.
  • cells having each different size are combined to accomplish the maximum network coverage so as to provide appropriate bandwidth according to traffic density expected in the fixed region.
  • GSM Global System for Mobile communications
  • timing of the frames transmitted between each different BTS is not synchronized with each other in the GSM.
  • the clock realized by the specific BTS may be shared only with the RFID readers located in the cell to which the specific BTS manages.
  • Fbwever in consideration of a substantial size of the cells ranging from few hundreds m to about 20 Km, it is satisfactory that the clock is shared with the readers in the same cell.
  • the GSM is based on a combination of Time Division Media Access (TDMA) and
  • Frequency Division Multiplexing FDM
  • logic channels such as a control channel and a traffic channel are multiplexed on a less nunber of physical channels according to the frame concept which will be described later.
  • FIG. 3 illustrates frame layers in the GSM according to an embodiment of the present invention.
  • the minimtm unit of transmission on a specific frequency is denoted as a burst and all bursts correspond to a time slot (TS). Numbers ranging from 0 to 7 are designated to the bursts in the order of an ascending series and eight bursts or sequences of TS form TDMA frames.
  • Multiframe and superframe are interposed between a basic TDMA frame and the hyperframe.
  • the mobile station checks a synchronization channel (SCH) and a frequency correction channel (FCC) which are dedicated as downlink control channels representing chronology of other remaining control channels.
  • SCH synchronization channel
  • FCC frequency correction channel
  • various methods of multiplexing various logic channels on the physical channels exist and some rules must be obeyed.
  • the FCC and SCH bursts must be included in a first TS, TSO, of a Broadcast Control Channel (BCCH) carrier at a specific frame nunber, and transmitted. Thus, these bursts may be interpreted as a regular clock tick by a RFID sub-system.
  • BCCH Broadcast Control Channel
  • the present invention can be also applied to other logic channels and physical channels used in other mobile communication standard.
  • FIG. 4 illustrates five burst formats defined in the GSM according to an embodiment of the present invention.
  • a normal burst, a synchronization burst, an access burst, a frequency correction bursts, and a durmy bursts are defined in the GSM.
  • Each burst has different structure. Fbwever, these bursts are the same in that duration of all bursts is accurately 577 ⁇ s and 156.25 bits can be transmitted during such duration.
  • the clock shared by the mobile RFID readers included in a cell of the GSM is formed by detecting a specific GSM pattern during GSM downlink communication by a GSM logic (for example, starting of the TDMA frame, starting of the synchronization burst, or a starting point of specific burst transmission) and a mobile RFID logic is triggered directly or after a predetermined delay time by the shared clock so as to start to command to a tag.
  • a GSM logic for example, starting of the TDMA frame, starting of the synchronization burst, or a starting point of specific burst transmission
  • FIG. 5 illustrates synchronization of a system clock according to an embodiment of the present invention.
  • a clock signal is generated in the starting point of reception of each burst so that the RFID system clock is synchronized and the system clock of all mobile RFID readers in the cell of the GSM is shared.
  • an interval between two or more subsequent clock ticks may be used as a means for measuring an expected occupying time of the RFID channels or a talk time.
  • the synchronized system clock may be used as a synchronization signal for RFID transmitting and as the TS for RFID ⁇ mmunication with the tag, or a signal for the TS.
  • the GSM is used as an example and any base station based network standard using the fame concept that is similar to the GSM can be used to realize the shared clock approach.
  • FIG. 6 is a block diagram of the RFID reader (mobile RFID reader) embedded in the mobile station according to an embodiment of the present invention.
  • the mobile RFID reader 600 includes a mobile communication unit 610, an interface unit 630, and a RFID reader unit 650.
  • the mobile communication unit 610 includes a transmitting unit 611, a control unit
  • the transmitting unit 611 and the receiving unit 615 communicate with the mobile communication base transceiver station using protocol of one of the mobile communication methods such as GSM, UMTS, CDMA, and W-CDMA.
  • the receiving unit 615 receives a downlink frame broadcasted by the base transceiver station of the network which covers the specific frequency spectrum and generates a clock synchronization signal in the specific pattern of the frame received according to the control signal of the control unit 613.
  • the specific pattern of the frame may be a starting point of the frame or the starting point of the burst.
  • the burst may be the synchronization burst and may be received by downlink from the base transceiver station.
  • the mobile communication unit 610 may transmit the clock synchronization signal formed by using the starting point of the frame, the result of the detection for the starting point of the burst, or the result of the detection directly or after a predetermined delay time to the RFID reader unit 650.
  • the interface unit 630 transmits the clock synchronization signal that the mobile communication unit 610 generates by using the starting point of the frame, the result of the detection for the starting point of the burst, or the result of the detection to the RFID reader unit 650.
  • the RFID reader unit 650 includes transmitting unit 651, a control unit 653, and a receiving unit 655.
  • the RFID reader unit 650 uses the timing information for determining an interval for performing tasks, the tasks being required for regular scheduling in order to solve access of or a collision with media, for example, sensing carrier.
  • Various kinds of the frame patterns received by the mobile ⁇ mmunication unit 610 may be used as the clock tick.
  • the transmitting unit 651 and the receiving unit 655 perform RFID ⁇ mmunication with the tag.
  • the control unit 653 synchronizes the RFID reader unit 650 by the clock synchronization signal transmitted from the mobile communication unit 610.
  • the control unit 653 counts the clock ticks by a counter and the interval between two or more subsequent clock ticks may be used to generate the TS for RFID ⁇ mmunication with the tag or may be used as a means for measuring an expected occupying time of the RFID channels or remaining talk time.
  • the RFID reader unit 650 may perform secondary RFID operation by the shared system clock, the secondary RFID operation including internal and external events logging such as whether a sensor threshold value exceeds, a RFID related functioning trigger such as a smart sensor, or an actuator, and a RFID inventory trigger, in addition to synchronization.
  • FIG. 7 is a flowchart illustrating a RFID communication method of the mobile RFID reader according to an embodiment of the present invention.
  • the detailed description that is already mentioned above is omitted.
  • the mobile station generates the clock synchronization signal at the specific pattern of the downlink frame that is broadcasted by the base transceiver station of the network which covers the specific frequency spectran.
  • the specific pattern may include information indicating starting of the downlink frame or starting of the burst forming the frame.
  • the mobile station is synchronized by the clock synchronization signal and shares the system clock with other mobile RFID readers.
  • the mobile station shares the system clock with other mobile RFID readers by the clock synchronization and then, generates the TS for RFID communication with the tag based on the synchronization clock, in operation 750.
  • the mobile station may determine the starting and ending of the TS by one or more clock ticks.
  • the nunber of the TS allocated by the base transceiver station and channel location information are used to perform RFID ⁇ mmunication with the tag without a collision with other mobile station.
  • the specific logic channel is detected from the physical channel to which various logic channels are multiplexed and the result of the detection is shared with all mobile RFID readers in the network or the cell so that the synchronized system clock (that is, synchronization clock) is shared and the synchronization clock is used as clock tick information, thereby reducing a collision with the RFID readers during the RFID ⁇ mmunication.
  • the synchronized system clock that is, synchronization clock
  • hard- wired circuitry may be used in place of or in combination with processor/ ⁇ mtroller programmed with ⁇ mputer software instructions to implement the invention.
  • embodiments of the invention are not limited to any specific combination of hardware circuitry and software.
  • the invention can also be embodied as ⁇ mputer readable codes on a ⁇ mputer readable re ⁇ >rding medium.
  • the ⁇ mputer readable re ⁇ >rding maximn is any data storage device that can store data which can be thereafter read by a ⁇ mputer system. Examples of the ⁇ mputer readable re ⁇ >rding maximn include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the Internet).
  • the ⁇ mputer readable re ⁇ >rding maximn can also be distributed over network ⁇ mpled ⁇ mputer systems so that the ⁇ mputer readable ⁇ >de is stored and executed in a distributed fashion. Also, functional programs, codes, and ⁇ >de segments for accomplishing the present invention can be easily construed by programmers skilled in the art to which the present invention pertains.

Abstract

L'invention concerne un lecteur d'identification par radiofréquence (RFID) mobile et un procédé de communication RFID utilisant une horloge système partagée. L'horloge synchronisant les lecteurs RFID mobiles peut être partagée sans changement de matériel d'un dispositif RFID classique. En outre, étant donné que l'horloge partagée est utilisée, on peut réaliser facilement une technologie permettant d'empêcher une collision avec les lecteurs dans un environnement de plusieurs lecteurs mobile.
PCT/KR2008/006011 2007-10-12 2008-10-13 Lecteur rfid mobile et procédé de communication rfid utilisant une horloge système partagée WO2009048307A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/682,313 US20100207736A1 (en) 2007-10-12 2008-10-13 Mobile rfid reader and rfid communication method using shared system clock

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20070103150 2007-10-12
KR10-2007-0103150 2007-10-12
KR1020080078120A KR20090037798A (ko) 2007-10-12 2008-08-08 공유 시스템 클록을 이용한 모바일 ｒｆｉｄ 리더 및 ｒｆｉｄ 통신 방법
KR10-2008-0078120 2008-08-08

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WO2009048307A2 true WO2009048307A2 (fr) 2009-04-16
WO2009048307A3 WO2009048307A3 (fr) 2009-05-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3550031A1 (fr) 2012-07-24 2019-10-09 Pharmacyclics, LLC Mutations associées à la résistance aux inhibiteurs de la tyrosine kinase de bruton (btk)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002073870A2 (fr) * 2001-03-09 2002-09-19 Flarion Technologies, Inc. Procedes de synchronisation de rythme de symboles dans des systemes de communication
WO2004100577A1 (fr) * 2003-05-09 2004-11-18 Zion Hadad Systeme et procede de reseau cellulaire
WO2007073099A1 (fr) * 2005-12-22 2007-06-28 Lg Innotek Co., Ltd Systeme rfid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002073870A2 (fr) * 2001-03-09 2002-09-19 Flarion Technologies, Inc. Procedes de synchronisation de rythme de symboles dans des systemes de communication
WO2004100577A1 (fr) * 2003-05-09 2004-11-18 Zion Hadad Systeme et procede de reseau cellulaire
WO2007073099A1 (fr) * 2005-12-22 2007-06-28 Lg Innotek Co., Ltd Systeme rfid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3550031A1 (fr) 2012-07-24 2019-10-09 Pharmacyclics, LLC Mutations associées à la résistance aux inhibiteurs de la tyrosine kinase de bruton (btk)

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