WO2006011207A1 - 無線タグ読取システム、無線タグ読取装置および無線タグ - Google Patents
無線タグ読取システム、無線タグ読取装置および無線タグ Download PDFInfo
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- WO2006011207A1 WO2006011207A1 PCT/JP2004/010813 JP2004010813W WO2006011207A1 WO 2006011207 A1 WO2006011207 A1 WO 2006011207A1 JP 2004010813 W JP2004010813 W JP 2004010813W WO 2006011207 A1 WO2006011207 A1 WO 2006011207A1
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- wireless tag
- wireless
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- 238000004891 communication Methods 0.000 claims abstract description 141
- 230000004044 response Effects 0.000 claims abstract description 110
- 238000001514 detection method Methods 0.000 claims abstract description 88
- 230000005540 biological transmission Effects 0.000 claims description 16
- 230000008034 disappearance Effects 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 42
- 230000008569 process Effects 0.000 description 23
- 238000010586 diagram Methods 0.000 description 13
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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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
- G06K7/10118—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 the sensing being preceded by at least one preliminary step
- G06K7/10128—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 the sensing being preceded by at least one preliminary step the step consisting of detection of the presence of one or more record carriers in the vicinity of the interrogation device
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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.
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/59—Responders; Transponders
Definitions
- Wireless tag reading system Wireless tag reader, and wireless tag
- the present invention detects a wireless tag entering and Z or disappearance within a predetermined area of a wireless tag, and quickly starts communication with the wireless tag, and a wireless tag reading device constituting the system And the wireless tag.
- a gate (corresponding to a wireless tag reader) having a blocking means is installed on the delivery carrier's passage route, and the product attached to the wireless tag and the delivery carrier do not satisfy the predetermined condition.
- the blocking means is closed and the result and cause are notified to the delivery carrier.
- the detection means arranged at the gate optically detects the passage of the delivery carrier gate, and as a result, when the delivery carrier passes through the gate, processing using a wireless tag is performed.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-327331
- the detection means in the receipt / shipment registration processing system described in Patent Document 1 optically detects the passage of the delivery carrier, and does not detect it using a wireless tag attached to the delivery carrier. Nare ,. Therefore, the detection area where the detection means can detect the delivery carrier must be the same as the communication area of the RFID tag reader (gate). In such a system, the communication frequency band and output are changed, and the wireless tag and wireless tag are changed. Similarly, when trying to expand the communication area with the scanning device, it is necessary to expand the detection area that can be detected by the detection means as well.
- the detection means uses a method for optically detecting the delivery carrier, and the radio used for the wireless tag and the light for detecting the delivery carrier are physically different in diffraction characteristics.
- ISO / IEC18000 part 6 which is one of the wireless tag standards, stipulates a method of sequentially reading a plurality of wireless tags by the slot Aloha method.
- the present invention has been made in view of the above, and in a situation where a plurality of wireless tags enter and / or disappear in the communication area of the wireless tag reader at a time, the wireless tag detection area and the communication area Of the wireless tag that has entered the communication area.
- a wireless tag reading system capable of starting ID reading at high speed, and a wireless tag reading device and a wireless tag used in the wireless tag reading system.
- a wireless tag reading system comprising: a wireless tag that is attached and stores wireless tag information that is predetermined information relating to the object; and a wireless tag reader that reads wireless tag information of the wireless tag.
- the reader has a communication means for performing wireless communication with the wireless tag, and a search signal for detecting entry and Z or disappearance of the wireless tag within a communication area where wireless communication can be performed by the communication means.
- Radio tag detection processing means for transmitting from the communication means at time intervals and detecting entry and Z or disappearance of the radio tag in the communication area by a response signal to the search signal; and receiving the response signal from the radio tag
- Wireless tag information communication processing means for reading the wireless tag information of the wireless tag, and the wireless tag includes the wireless tag.
- the detection means for detecting the wireless tag that has entered the communication area of the wireless tag reader and the communication means for communicating with the wireless tag are used in the same manner.
- the detection area of the wireless tag by the detection means is the same as the communication area of the wireless tag by the communication means, so that the wireless tag can be detected and communicated efficiently.
- the wireless tag reading device since the transmission speed of the response signal for the search signal for detecting the wireless tag is reduced and transmitted, the wireless tag reading device in a state where the response signals from the plurality of wireless tags are pseudo-synchronized.
- the wireless tag reader can detect the entry of the wireless tag.
- the RFID tag reading process is performed as soon as the entry of the RFID tag is detected, it is possible to avoid a large time loss during the RFID tag reading process and to suppress a reduction in the RFID tag reading rate. Also have.
- FIG. 1 is a block diagram showing a schematic configuration of a wireless tag reading system according to the present invention.
- FIG. 2 is a schematic diagram showing an example to which the wireless tag reading system of the present invention is applied.
- FIG. 3 is a diagram showing a waveform of a response signal with respect to a search signal of a wireless tag.
- FIG.4 Flowchart showing the procedure for detecting the entry of a wireless tag in a wireless tag reading system Is.
- FIG. 5 is a diagram schematically showing an example of a configuration to which Embodiment 2 of the wireless tag reading system according to the present invention is applied.
- FIG. 6 is a flowchart showing a procedure of wireless tag detection processing and reading processing by the wireless tag reader of the present invention.
- FIG. 7 is a flowchart showing a procedure of response processing for a search signal by a wireless tag.
- FIG. 8 is a sequence diagram showing a wireless tag detection processing procedure according to the second embodiment of the wireless tag reading system of the present invention.
- FIG. 9 is a diagram illustrating an example of a frame configuration of a search signal transmitted by the wireless tag reader.
- FIG. 1 is a block diagram showing a schematic configuration of a wireless tag reading system according to the present invention.
- This wireless tag reading system 1 has wireless tag information that is predetermined information about a mounted object such as a product and is attached to the mounted body, and within a range in which wireless communication with the wireless tag 2 is possible.
- the wireless tag reader 3 is configured to have wireless communication with a wireless tag 2 existing in a certain communication area.
- the wireless tag 2 includes a communication unit 21 that performs wireless communication with the wireless tag reading device 3, a response processing unit 22 that performs response processing based on a signal from the wireless tag reading device 3,
- the wireless tag information storage unit 23 stores the wireless tag information, and the control unit 24 controls each of these processing units.
- the response processing means in the claims corresponds to the functions of the communication unit 21 and the response processing unit 22.
- the communication unit 21 converts the electronic message from the response processing unit 22 into an electric signal, and further converts the electric signal into an electromagnetic wave (radio signal) of a predetermined frequency and sends it out, or from the radio tag reader 3 It has a function of converting a radio signal into an electric signal, further converting the electric signal into a telegram, and outputting it to the response processing unit 22.
- an electromagnetic wave radio signal
- the response processing unit 22 has a function of performing processing according to the content of the signal received from the wireless tag reader 3, and responds to the wireless tag information stored in the normal wireless tag information storage unit 23. If the search signal of the RFID tag reader 3 is received, the response signal is transmitted to the search signal based on the field included in the search signal frame. It has the function of transmitting through the communication unit 21 at a reduced speed. The response processing unit 22 performs processing so that only the response signal for the search signal is transmitted at a reduced transmission speed.
- the wireless tag information storage unit 23 includes identification information such as an ID for uniquely identifying the wireless tag 2, and predetermined information according to the purpose of use of the wireless tag 2 related to an object to which the wireless tag 2 is attached.
- the RFID tag information is stored.
- the wireless tag reader 3 includes a communication unit 31 that performs communication with the wireless tag 2, a modulation / demodulation unit 32 that performs modulation / demodulation of a signal transmitted and received by the communication unit 31, and a communication area of the wireless tag reader 3.
- the wireless tag detection processing unit 33 detects whether or not the wireless tag 2 has entered the wireless tag 2, and when the wireless tag 2 enters the communication area, the identification information (ID) of the wireless tag 2 is read to perform predetermined processing.
- the wireless tag information communication processing unit 34 is configured to include a control unit 35 that controls each of these processing units.
- the communication unit 31 converts the electrical signal from the modulation / demodulation unit 32 into an electromagnetic wave (radio signal) having a predetermined frequency and sends it out, or converts the radio signal from the wireless tag 2 into an electrical signal to convert the modulation / demodulation unit 3. It has a function to output to 2.
- the modem unit 32 converts a message from the wireless tag detection processing unit 33 or the wireless tag information communication processing unit 34 into an electrical signal and outputs the electrical signal to the communication unit 31 or an electrical signal output from the communication unit 31.
- This function has the function of converting the message into a message and outputting it to the wireless tag detection processing unit 33 and the wireless tag information communication processing unit 34.
- the wireless tag detection processing unit 33 has a function of detecting whether or not the wireless tag 2 has entered the communication area determined according to the output of the wireless signal output from the communication unit 31.
- the wireless tag detection processing unit 33 includes a search signal including a field in which a command is described so that the wireless tag 2 that has received the search signal reduces the transmission rate by a predetermined rate and sends a response signal.
- a search signal including a field in which a command is described so that the wireless tag 2 that has received the search signal reduces the transmission rate by a predetermined rate and sends a response signal.
- the wireless tag information communication processing unit 34 is stored in the wireless tag 2 that has entered the communication area when the wireless tag detection processing unit 33 determines that the wireless tag 2 has entered the communication area. It has a function of reading information and the like.
- the processing by the wireless tag information communication processing unit 34 is the same as the reading processing and writing processing that are normally performed on the wireless tag 2 and is not a feature of the present invention, and thus detailed description thereof is omitted.
- FIG. 2 is a schematic diagram showing an example to which the wireless tag reading system of the present invention is applied.
- RFID tags 2A-2C are attached to, for example, boxes 41A-41C for storing products, and a pallet on which a plurality of boxes 41A-41C are placed together.
- a case is shown in which a cart 43 or the like is transported within the communication area 50 of the RFID tag reader 3 of a certain store.
- the present invention is suitably applied to the receipt / shipment management of merchandise as shown in FIG.
- FIG. 2 the case where a large number of wireless tags 2A-2C enter the communication area 50 at the same time as one group is taken as an example, and the wireless tags 2A-2C of the wireless tag reader 3 are used.
- the principle of approach detection and the processing procedure of the RFID tag reading system 1 will be described.
- the wireless tag detection processing unit 33 of the wireless tag reader 3 transmits a search signal for detecting the wireless tag 2A 2C entering the communication area 50 at a predetermined time interval.
- a search signal one signal is used for a plurality of radio tags 2A and 2C, and the response processing units 22 of all the radio tags 2A and 2C return a predetermined response signal when receiving this search signal.
- This response signal has the same waveform regardless of the identification information of the wireless tags 2A-2C.
- the RFID tags 2A-2C simultaneously respond and send a response signal, and the RFID tag reader 3 sends the response signal simultaneously (synchronously). ) Receive. That is, the wireless tag detection processing unit 33 determines that the wireless tag 2A-2C has entered the communication area 50 by receiving a response signal having a predetermined shape synchronized from each wireless tag 2A-2C. It is possible to determine S.
- FIG. 3 is a diagram illustrating a waveform of a response signal with respect to a search signal of the wireless tag.
- the horizontal axis indicates time
- the vertical axis indicates the signal level of the response signal.
- the wireless tag detection processing unit 33 transmits a frame of a search signal that includes a command to reduce the transmission speed of the response signal in the field.
- the transmission speed of the response signal transmitted by the wireless tag that has received the search signal is reduced by the response processing unit 22 of the wireless tag 2A-2C, and as a result, the rate of jitter is reduced.
- the response signal becomes pseudo-synchronized.
- the synchronized response signal is received by the communication unit 31, demodulated by the modem unit 32, and the wireless tag detection processing unit 33 can recognize the response signal.
- the wireless tag reader 3 can simultaneously receive response signals from a plurality of wireless tags 2A-2C, and wireless tags can be received from the response signals.
- 2A The presence or absence of entry into 2C communication area 50 is determined.
- FIG. 4 is a flowchart showing a procedure for detecting the entry of a wireless tag in the wireless tag reading system.
- the wireless tag detection processing unit 33 determines whether or not a predetermined time has passed (step S11), and if the predetermined time has not passed (step S11). If the specified time has elapsed (if Yes in step S11), the wireless tag detection processing unit 33 is a field for reducing the transmission speed of the response signal of the wireless tag. A search signal including is transmitted (step S12).
- the predetermined time is arbitrarily set when the RFID tag reading system 1 is designed.
- the wireless tag detection processing unit 33 determines whether or not a predetermined time has elapsed since the search signal was transmitted (step S13). This predetermined time is determined in consideration of the time until the radio tags 2A and 2C respond to the transmitted search signal. If the predetermined time has not elapsed since the search signal was transmitted (No in step S13), the wireless tag detection processing unit 33 sends the response signal from the wireless tag 2A 2C via the communication unit 31. Inspection It is determined whether or not it has been delivered (step S14). If a response signal from the wireless tag 2A-2C is detected before the predetermined time has elapsed (Yes in step S14), the wireless tag detection processing unit 33 causes the wireless tag 2A-2C to be in the communication area.
- step S16 the wireless tag information communication processing unit 34 starts reading the wireless tag 2A 2C (step S16), and the wireless tag 2A-2C entry detection processing ends.
- the wireless tag reading process in step S16 is the same as the conventional process and is well known, and therefore the details thereof are omitted. If the response signal from the wireless tag 2A-2C is not detected after the search signal is sent in step S14 until the predetermined time elapses (in the case of No in step S14), repeat the step. Returning to S13, response signal detection processing is performed until a predetermined time elapses.
- step S13 if a predetermined time has elapsed since the search signal was transmitted in step S13 (Yes in step S13), the wireless tag detection processing unit 33 sets the wireless tag 2A in the communication area 50. It is assumed that 2C has not entered, and the response signal detection process is stopped (step S15), the process returns to step SI 1 and the above-described process is repeated.
- the force S described for the case where the wireless tag 2A-2C enters the communication area 50, and the case where the plurality of wireless tags 2A-2C have disappeared from the communication area 50 are described.
- the detection can be applied in the same manner as the detection of the entry of the wireless tag 2A-2C.
- the force described with reference to the response to the search signal as an example is a frame in which a command for temporarily reducing the transmission speed at the time of response of the wireless tags 2A-2C is stored in the field data.
- the search signal is not limited to any signal that can be used. However, in the claims, the search signal including such a signal is used.
- the wireless tag 2A-2C in the communication area 50 is used. Can be determined independently.
- the detection area of the detection means had to be changed accordingly.
- the device configuration of the wireless tag reader 3 is simplified, which contributes to space saving and can reduce the manufacturing cost of the device.
- the wireless tag information communication processing unit 34 performs the wireless tag reading process.
- the wireless tag 2A 2C can be read quickly, and a large time loss and a reduction in the reading rate of the wireless tag can be prevented.
- the wireless tag reader 3 since the wireless tag reader 3 sends a search signal every predetermined time, and the wireless tag receiving the search signal sends a response signal at a reduced transmission speed, the wireless tag reader 3 and multiple RFID tags 2A—Even if there is a difference in the distance between each RFID tag 2A and 2C among 2C, the response signals from all RFID tags 2A and 2C are artificially synchronized Can be received. As a result, it is possible to determine whether or not the wireless tag 2A-2C has entered the communication area 50 of the wireless tag reader 3.
- Embodiment 1 it is possible to detect a plurality of wireless tags entering the communication area at the same time by reducing the transmission speed of the response signal to the search signal of the wireless tag, and to read the wireless tag thereafter.
- the processing is performed quickly, in the second embodiment, by assigning priorities to the wireless tags, detection of a plurality of wireless tags entering the communication area all at once, and subsequent quick reading, etc.
- a wireless tag reading system that enables processing will be described.
- FIG. 5 is a diagram schematically showing an example of a configuration to which the second embodiment of the RFID tag reading system according to the present invention is applied.
- the wireless tag reading system 1 detects the entry of the wireless tag 2D-2G having priority information indicating the priority order in communication with the wireless tag reader 3 and the wireless tag 2D 2G into the communication area 50, and performs predetermined processing. And a wireless tag reader 3 that performs the above processing.
- the priority order is set for each of the wireless tags 2D-2G, and only one of the wireless tags 2G has a higher priority order than the other wireless tags 2D 2F. .
- the wireless tag group 2D-2G is composed of the wireless tag 2D-2F having a lower priority than the wireless tag 2G.
- a plurality of low-priority wireless tags attached to a box 41D—41F for storing products 2D—2F power, as in the case of managing receipt / shipment of products to / from a certain store. It can be suitably applied to the case where the RFID tag 2D-3G enters the communication area 50 at the same time by being placed on the pallet 42 to which one RFID tag 2G is attached.
- the wireless tag 2D-2G further includes priority order information indicating the priority order of the wireless tag 2D-2G in the wireless tag information storage unit 23 in FIG. 1 of the first embodiment.
- the response processing unit 22 compares the priority setting value included in the frame of the search signal from the wireless tag reader 3 with the priority information of the own wireless tag, and determines the result.
- the second embodiment will be described on the assumption that it does not have the function of reducing the response speed as in the first embodiment. Since other components are the same as those in the first embodiment, detailed description thereof is omitted.
- the wireless tag reader 3 is basically the same as the configuration shown in FIG. 1 of the first embodiment.
- the wireless tag detection processing unit 33 has a function of performing the entry detection processing of the wireless tag with the highest priority into the communication area 50 using the priority information attached to each wireless tag, After the wireless tag information communication processing unit 34 detects the high priority and the entry of the wireless tag by the wireless tag detection processing unit 33, the wireless tag information communication processing unit 34 starts with the high priority and decreases the priority from the wireless tag. It differs from the first embodiment in that it has a function of reading the wireless tag. Specifically, the wireless tag detection processing unit 33 performs processing for detecting the wireless tag 2G having the highest priority in the wireless tag 2D-2G group first, and detects one wireless tag 2G having the higher priority.
- the wireless tag information communication processing unit 34 first reads the wireless tag information of the wireless tag 2G, and then performs the wireless tag 2D-2F reading processing with a lower priority than the wireless tag 2G. Perform the process to start. Since other components are the same as those in the first embodiment, detailed description thereof is omitted.
- FIG. 6 is a diagram illustrating a wireless tag detection process and a reading process performed by the wireless tag reader according to the present invention.
- FIG. 7 is a flowchart showing a procedure of response processing to a search signal by a wireless tag
- FIG. 8 is a wireless tag detection processing procedure according to the second embodiment of the wireless tag reading system of the present invention.
- the priority of the wireless tag 2G is “3”
- the priority of the wireless tag 2D 2F is “4”
- the lower the numerical value indicating the priority the higher the priority. That is, the wireless tag 2G with the priority “3” has a higher priority than the wireless tag 2D 2F with the priority “4”.
- the wireless tag detection processing unit 33 determines whether or not a predetermined time has elapsed (step S31), If it has not elapsed (No in step S31), the wireless tag detection processing unit 33 enters a waiting state, and if the predetermined time has passed (Yes in step S31), the wireless tag detection processing unit 33 should respond.
- a search signal storing the tag priority (for example, “4”) in the priority setting value field is created and transmitted via the communication unit 31 (step S32).
- the priority of the wireless tag to be responded can be set to any order among the priorities of the own wireless tag reader 3. Further, it is assumed that the field indicating the transmission speed of the response signal is not included as in the first embodiment.
- FIG. 9 is a diagram illustrating an example of a frame structure of a search signal transmitted by the wireless tag reader.
- the search signal frame 70 includes a priority setting value 71 for limiting the wireless tag responding to the search signal and an identification of the wireless tag reader 3 that transmits the search signal.
- Information 72 is included.
- “4” is stored as the priority order setting value.
- Each wireless tag 2D-2G receives a search signal, but the processing differs depending on the type of priority information that the wireless tag 2D-2G has.
- the response processing unit 22 determines the priority of the search signal frame. Get the set value (Step S52).
- the response processing unit 22 compares the priority information of the own radio tag 2D-2G with the priority setting value of the acquired search signal frame (step S53).
- step S53 If the priority information of the own radio tag 2D 2G has a rank higher than the priority setting value of the search signal frame (if the priority is higher than the priority setting value in step S53), a response signal to the search signal Is transmitted from the communication unit 21 (step S54), and the process ends.
- the priority of the wireless tag 2D—2G is lower than the priority setting value of the search signal frame (when the priority is lower than the priority setting value in step S53)
- the response processing unit 22 determines that the search signal It is determined that the message is not addressed to the tag (step S55), the response signal to the search signal is not transmitted (step S56), and the process ends. Note that FIG.
- step S53 in FIG. 7 shows processing in the case of a general wireless signal transmitted to the wireless tag 2D-2G as well as the search signal. Further, in step S53 in FIG. 7, it is determined whether or not the priority order information set in the wireless tag 2D 2G has a rank higher than the priority order set value set in the wireless signal. It is determined whether the priority order information of the tag 2D 2G is equal to the priority setting value set for the radio signal, and a response may be made only when it is equal to the priority setting value set for the radio signal. Good. As described above, the response to the received search signal varies depending on the priority order of the wireless tags 2D 2G.
- the wireless tag detection processing unit 33 of the wireless tag reader 3 determines whether or not to receive a response signal from the wireless tags 2D-2G within a predetermined time after transmitting the search signal (step S33). ). If no response signal is detected within the predetermined time (No in step S33), it is determined whether or not signals from a plurality of wireless tags collide and cannot be received (step S34). Whether or not this signal collides can be determined based on the waveform of the signal received from the communication unit 31 and demodulated by the modem unit 32. If it is not a collision of signals from multiple wireless tags (No in step S34), the response signal detection process is stopped assuming that wireless tag 2 has not entered communication area 50 (step S35). ), The process returns to step S31 again.
- step S34 If signals from a plurality of wireless tags collide in step S34 (Yes in step S34), the wireless tag detection processing unit 33 determines the order of priority setting values included in the search signal.
- the process of increasing is performed (step S36), the process returns to step S32 again, and the priority set value with the increased rank is included in the search signal and transmitted.
- the radio tag 2G attached to the pallet 42 since the priority set value is set to “4” in the first search signal, the radio tag 2G attached to the pallet 42 having a priority higher than this priority set value is set. All of the RFID tags 2D and 2F attached to the boxes 41D and 41F return response signals, and the RFID tag reader 3 cannot detect the response signals. Therefore, the wireless tag detection processing unit 33 resets the priority order setting value to “3” and again described above. The processing from step S32 is repeatedly executed.
- step S33 if a response signal from the wireless tag 2 is detected within a predetermined time in step S33 (Yes in step S33), the wireless tag detection processing unit 33 causes the wireless tag 2G to communicate with the communication area. 50 is determined to have entered the wireless tag information, and a signal to start reading processing of the wireless tag information is output to the wireless tag information communication processing unit 34.
- the wireless tag detection processing unit 33 can detect the presence of the wireless tag.
- the wireless tag information communication processing unit 34 transmits an ID request signal to the wireless tag 2G (step S37).
- a field indicating the priority setting value is added to this ID request signal frame as well as the search signal frame, and the same priority setting value as the search signal transmitted in step S32 is set.
- the search signal is transmitted a plurality of times, the rank is finally raised in step S37, and the priority order set value set in the search signal is set in step S32.
- “3” is set in the priority field in the ID request signal frame.
- the wireless tag 2G that has received the ID request signal including the priority setting value equal to the priority information of the own wireless tag performs the same processing as in the case of FIG. 7 described above to identify the own wireless tag 2G.
- An ID response signal containing information is sent.
- the wireless tag reader 3 receives the ID response signal of the wireless tag 2G (step S38).
- the wireless tags 2D and 2F receive the ID request signal, but do not respond to the ID request signal because the priority is lower than the priority setting value.
- the wireless tag information communication processing unit 34 acquires the identification information in the received ID response signal (step S39).
- the RFID tag information communication processing unit 34 holds the object (box 41A 41C) to which the object having the RFID tag 2G (pallet 42) is attached with the radio tag 2D-2F having a lower priority.
- Step S40 For example, as shown in Figure 5, RFID tag 2G attached to pallet 42 has a higher priority than RFID tag 2D-2F attached to box 41D 41F. Pallet 42 holds multiple boxes 41D 41F. Therefore, the low-priority RFID tag 2D-2F is attached to the pallet 42 to which the RFID tag 2G is attached. Recognize that the attached object (in this case, boxes 41D-41F) is attached.
- This determination can be made, for example, by inserting information indicating the type of object to which the wireless tag 2G is attached into the identification information of the wireless tag 2G and reading this identification information. Further, a correspondence table between the identification information and the type of the object to which the wireless tag 2G is attached can be stored in advance, and the type of the object to which the wireless tag 2G is attached can be identified based on this correspondence table.
- the wireless tag information communication processing unit 34 prepares a priority field in which a priority order setting value lower than the priority order used in the wireless tag 2G in step S32 is set for the wireless tag 2D-2F, An ID request signal is transmitted to a plurality of wireless tags 2D 2 F using a control method such as slot aloha (step S41).
- a control method such as slot aloha
- the wireless tag 2D-2F performs the same processing as in FIG. 7 described above, confirms the priority order setting value included in the ID request signal frame, and has the priority order corresponding to the own wireless tag 2D-2F.
- an ID response signal is transmitted according to a control method such as slot aloha.
- the wireless tag information communication processing unit 34 receives the ID response signal from the wireless tag 2D-2F (step S42), and the detection process and the reading process of the wireless tag 2D-2G are completed.
- FIG. 8 is a sequence diagram showing the above processing in the overall flow of the system configuration shown in FIG.
- the wireless tag reader 3 determines whether or not a wireless tag 2G having a higher priority has entered the communication area 50, and when it has entered, the identification information of the wireless tag 2G. Request.
- the wireless tag 2G is attached to the wireless tag 2G only when it is determined from the identification information that the wireless tag 2G can hold the object to which the wireless tag 2D-2F having a lower priority is attached. Therefore, it is determined that there is another low-priority wireless tag 2D-2F.
- identification information is requested from the low-priority RFID tags 2D 2F, and the RFID tag information reading process is individually executed.
- the power shown in FIG. 5 as an example of installation of the wireless tag is shown in FIG. 5.
- one wireless tag 2G and a plurality of lower priority orders than the wireless tag 2G are used. If it consists of a wireless tag 2D 2F, the object to which the wireless tag can be attached is the box 41 D—It doesn't have to be limited to things like 41F or pallet 42.
- the priorities of the wireless tag 2D-2F and the wireless tag 2G are known in advance.
- the wireless tag information of the wireless tag having a high priority corresponding to the wireless tag 2G The priority information corresponding to the priority of the wireless tag 2D 2F may be written in the storage unit 23 in advance to realize the second embodiment.
- the RFID tag reader 3 transmits a search signal to detect the entry of the RFID tag 2G.
- the signal used for detection is particularly a search signal. If the priority setting value for the wireless tag 2D-2G that should respond is not necessarily required, the type of signal to be transmitted is not limited. .
- the priority in the second embodiment indicates fixed identification information (ID) inside the wireless tag, and can be uniquely identified if the configuration shown in FIG. 5 is possible.
- ID fixed identification information
- the present invention is not limited to the special addition of the identification information called the priority information that can use the existing identification information (ID) or a part thereof.
- priority order information may be given additionally to configure the wireless tag reading system 1 according to the present invention.
- the priority is configured in two stages. However, it is not necessary to have two stages, and a plurality of stages can be provided. If the priority of the RFID tag entering the communication area with multiple levels of priority is unknown, the search signal is transmitted while the priority is changed, and the search signal response signal is received normally. A method of scanning the priority order may be applied to the wireless tag detection processing unit so that the entry of the wireless tag is detected repeatedly until possible. Furthermore, the methods of Embodiment 1 may be combined.
- the modulation / demodulation unit 3 of the wireless tag 2D 2G or the wireless tag reader 3 is provided.
- the wireless tag reader 3 recognizes the priority of the wireless tag 2 entering the communication area 50 in advance, and the priority exactly matches the priority of the wireless tag that enters. Order It is not necessary to set the priority order including the set value. In other words, if a response signal to a search signal including a certain priority order setting value collides, a priority setting value with a higher priority is set and the search signal is repeatedly repeated until the response signal does not collide.
- the wireless tag 2 entering the communication area 50 can be detected by transmitting. As a result, even when the combination of the priorities of the wireless tags 2 entering the communication area 50 is different, the wireless tag reader 3 can cope.
- the present invention is suitable for a wireless tag reading system that performs detection when a plurality of wireless tag groups enter the communication area of the wireless tag reading device each time or disappears from the communication area.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006527739A JP4550059B2 (ja) | 2004-07-29 | 2004-07-29 | 無線タグ読取システム、無線タグ読取装置および無線タグ |
US11/631,677 US7889058B2 (en) | 2004-07-29 | 2004-07-29 | Radio-tag reading system, radio-tag reader, and radio tag |
PCT/JP2004/010813 WO2006011207A1 (ja) | 2004-07-29 | 2004-07-29 | 無線タグ読取システム、無線タグ読取装置および無線タグ |
EP04771026A EP1772972B1 (en) | 2004-07-29 | 2004-07-29 | Radio tag read system, radio tag read device, and radio tag |
TW093124311A TW200604953A (en) | 2004-07-29 | 2004-08-13 | Radio frequency indentification tag reading system, radio frequency identification tag reading device, and radio frequency identification tag |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/010813 WO2006011207A1 (ja) | 2004-07-29 | 2004-07-29 | 無線タグ読取システム、無線タグ読取装置および無線タグ |
Publications (1)
Publication Number | Publication Date |
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WO2006011207A1 true WO2006011207A1 (ja) | 2006-02-02 |
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ID=35785966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/010813 WO2006011207A1 (ja) | 2004-07-29 | 2004-07-29 | 無線タグ読取システム、無線タグ読取装置および無線タグ |
Country Status (5)
Country | Link |
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US (1) | US7889058B2 (ja) |
EP (1) | EP1772972B1 (ja) |
JP (1) | JP4550059B2 (ja) |
TW (1) | TW200604953A (ja) |
WO (1) | WO2006011207A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
EP1772972B1 (en) | 2011-09-21 |
EP1772972A4 (en) | 2007-11-28 |
EP1772972A1 (en) | 2007-04-11 |
JPWO2006011207A1 (ja) | 2008-05-01 |
US7889058B2 (en) | 2011-02-15 |
TW200604953A (en) | 2006-02-01 |
US20080088414A1 (en) | 2008-04-17 |
JP4550059B2 (ja) | 2010-09-22 |
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