JP2010202348A - Reception/dispatch management system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reception/dispatch management system obtaining management information of a radio IC tag moved on a passage only by the passage. <P>SOLUTION: A plurality of antennas are provided on a plurality of passages extending in a first direction respectively. The radio IC tag is provided on an article, retains the management information regarding the article and transmits a transmission electric wave indicating the management information when it enters a transmission electric wave arrival area of the plurality of antennas when it is moved in the first direction on the plurality of passages. A plurality of reader/writers receive the transmission electric wave from the radio IC tag by the plurality of antennas respectively and transmit the management information indicated by the transmission electric wave. A control device receives the management information from the plurality of reader/writers. In the transmission electric wave of the radio IC tag, at least one of data rate, a data coding system and a modulation system is different in every passage. Further, the radio IC tag is provided with a plurality of communication sessions. Each of the plurality of antennas includes a group of antennas allotted with the plurality of communication sessions. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an entry / exit management system that attaches a wireless IC tag to an article and manages entry / exit of the article moving on a passage.

  In warehouses, stores, etc., management of articles that are loaded and unloaded has been performed by pasting barcodes on articles and reading barcodes with barcode readers. Recently, a method has been used in which a wireless IC tag is attached to an article, management information relating to the article is recorded in the wireless IC tag, management information is collectively read from the wireless IC tag by a reader / writer, and entry / exit management of the article is performed. Yes.

  Wireless is used for reading the wireless IC tag. When both the antenna and the wireless IC tag are in the wireless communicable area, the reader / writer and the wireless IC tag start communication via the antenna, and the reader / writer acquires management information from the wireless IC tag. Accordingly, the wireless IC tag in the area where the transmission radio wave from the antenna reaches is activated, and the radio IC tag transmits the transmission radio wave to the surroundings. When a plurality of reader / writers exist around the wireless IC tag, the plurality of reader / writers receive management information of the wireless IC tag.

  For example, a plurality of passages extending in the first direction are provided in a warehouse or a store. Each entrance of the plurality of passages is referred to as a gate. A plurality of reader / writers are provided in the plurality of passages, respectively. A wireless IC tag is attached to the article. The article is placed on a carriage and moved on the passage through the gate by the carriage. Carry in / out management of goods at that time.

  However, if the passage is provided adjacently, the management information of the wireless IC tag may be read by the reader / writer provided in the passage adjacent to the passage when the carriage moves on the passage. There is. In this case, it is determined that the article attached with the wireless IC tag has passed in the adjacent passage.

  This section introduces documents related to wireless tags (wireless IC tags) and gate passage.

  Japanese Patent Laying-Open No. 2005-69861 describes a wireless communication device. A wireless communication device includes a wireless tag having an IC, a plurality of antennas having directivity, a changeover switch for selecting one of transmission / reception signals of the plurality of antennas, and a signal from the switch Or a reader / writer for outputting to the switch. In this wireless communication device, a plurality of antennas are arranged so that their directivity directions face each other and are paired, and a switch is controlled by a reader / writer or another device provided outside the plurality of antennas. By switching the transmit / receive signal, the RFID tag data for each antenna is read, and only when all the antennas installed in pairs to recognize the RFID tag recognize the RFID tag. It is characterized by determining that it is valid.

  Japanese Patent Laid-Open No. 2007-88937 describes a wireless tag gate reader. The wireless tag gate reader includes a plurality of antenna pairs arranged to face each other so as to form a moving space through which a recognition target with a wireless tag passes, and wireless tag readers connected to these antenna pairs. This RFID tag gate reader is arranged with an inclination angle so that the width of the moving space is expanded at both ends of the antenna pairs arranged at both ends of the moving space among a plurality of pairs of antennas arranged opposite to each other. It is characterized by having.

  Japanese Patent Application Laid-Open No. 2008-83739 describes an automatic ticket gate. The automatic ticket gate device performs ticket gate processing by wirelessly communicating ticket gate information with an information medium possessed by a passenger. The automatic ticket gate includes a sensor for detecting passenger traffic, a reader / writer for communicating with an information medium, a communication control unit for starting communication of the reader / writer based on a detection result of the sensor, and an information medium For communication signal transmission and reception between the two ticket gate units, placed on the floor surface, based on the directional antenna with the maximum directional gain in the ceiling direction, the detection result by the sensor and the information contained in the information medium It is characterized by comprising a control device that recognizes the identity of the information medium and the passenger and determines the passage permission.

JP 2005-69861 A JP 2007-88937 A JP 2008-83739 A

  An object of the present invention is to provide an entry / exit management system capable of acquiring management information of a wireless IC tag moving on a passage only through the passage.

  The entry / exit management system of the present invention includes a plurality of antennas, a wireless IC tag, a plurality of reader / writers, and a control device. The plurality of antennas are provided in each of the plurality of passages extending in the first direction. The wireless IC tag is provided on an article, holds management information on the article, and enters the transmission radio wave arrival area of the plurality of antennas when moved in the first direction on the plurality of passages. The outgoing radio wave representing is transmitted. Each of the plurality of reader / writers receives a transmission radio wave from the wireless IC tag through a plurality of antennas, and transmits management information represented by the transmission radio wave. The control device receives management information from a plurality of reader / writers. At least one of a data rate, a data encoding method, and a modulation method differs in the radio wave transmitted from the wireless IC tag for each path.

  The entry / exit management system of the present invention includes a plurality of antennas, a wireless IC tag, a plurality of reader / writers, and a control device. The plurality of antennas are provided in each of the plurality of passages extending in the first direction. The wireless IC tag is provided on an article, holds management information on the article, and enters the transmission radio wave arrival area of the plurality of antennas when moved in the first direction on the plurality of passages. The outgoing radio wave representing is transmitted. Each of the plurality of reader / writers receives a transmission radio wave from the wireless IC tag through a plurality of antennas, and transmits management information represented by the transmission radio wave. The control device receives management information from a plurality of reader / writers. The wireless IC tag includes a plurality of communication sessions. Each of the plurality of antennas includes an antenna group to which the plurality of communication sessions are assigned.

  According to the warehouse management system of the present invention, at least one of the data rate, the data encoding method, and the modulation method of the radio wave transmitted from the wireless IC tag is different for each path. Thereby, even if the wireless IC tag moving on the passage is activated by the leaked radio wave of the adjacent passage, the radio wave transmitted from the wireless IC tag is not used in the passage. Therefore, according to the storage / retrieval management system of the present invention, the management information of the wireless IC tag moving on the passage can be acquired only by the passage.

  According to the warehouse management system of the present invention, the wireless IC tag has a plurality of communication sessions, the antennas in each passage are in charge of different communication sessions, and the antenna arrangement in each passage is the same for each communication session. ing. As a result, even if the wireless IC tag that passes through the adjacent passage is activated by the leaked radio wave of the passage, the radio wave transmitted from the wireless IC tag does not reach the antenna that sent the leaked radio wave of the passage, and the other antennas of the passage communicate Because the session is different, the radio waves from the wireless IC tag are not used. Therefore, according to the storage / retrieval management system of the present invention, the management information of the wireless IC tag moving on the passage can be acquired only by the passage.

FIG. 1 shows the configuration of a warehouse management system according to an embodiment of the present invention. FIG. 2 is a top view in which the carriage 1 passes through the gate A and moves on the passage A in the first direction as a conceptual diagram showing the operation of the storage / retrieval management system according to the embodiment of the present invention. FIG. 3 is a conceptual diagram showing the operation of the warehouse management system according to the embodiment of the present invention. As the carriage 1 passes through the gate A and moves on the passage A in the first direction, the carriage 2 moves through the gate B. FIG. 6 is a top view passing through and moving on a passage B in a first direction. FIG. 4 is a conceptual diagram showing the operation of the warehouse management system according to the embodiment of the present invention. As the carriage 1 moves through the gate A in the first direction through the gate A, the carriage 2 moves through the gate B. FIG. 6 is a top view passing through and moving on a passage B in a first direction. FIG. 5 shows an encoded representation of data “001” with M = 2 and M = 4, which are two encoding methods of the mirror encoding method, in the storage / exit management system according to the embodiment of the present invention. FIG. 6 is an example of a data rate, a data encoding method, and a modulation method when a wireless IC tag transmits in passages A and B in the storage / exit management system according to the embodiment of the present invention.

  With reference to the accompanying drawings, a warehouse management system according to an embodiment of the present invention will be described in detail below.

[Constitution]
FIG. 1 shows the configuration of a warehouse management system according to an embodiment of the present invention. The entry / exit management system according to the embodiment of the present invention includes a wireless IC tag 3, a plurality of reader / writers 6 to 8, a control device 9, an entry / exit management device 10, and a plurality of antennas 11 to 22. Yes.

  The antennas 11 to 14 are connected to the reader / writer 6 through a cable. The antennas 15 to 18 are connected to the reader / writer 7 through cables. The antennas 19 to 22 are connected to the reader / writer 8 via a cable. The reader / writers 6 to 8 are connected to the control device 9 via a cable. The control device 9 is connected to the entry / exit management device 10. The control device 9 may be directly connected to the entry / exit management device 10 or may be connected via a network.

  First, the wireless IC tag 3 will be described.

  The wireless IC tag 3 has a card shape, and an IC is mounted in the card. The wireless IC tag 3 is attached to an article, and the article is managed using the wireless IC tag 3. Management information relating to the article is stored in the IC. The wireless IC tag 3 communicates with the antenna, and management information is read from or written to the wireless IC tag 3 by a reader / writer connected to the antenna. The management information includes an identifier that identifies the wireless IC tag 3, an article name that is the name of the article, and an identifier that identifies the article. The identifier of the wireless IC tag 3 and the identifier of the article are represented by alphanumeric characters.

  The wireless IC tag 3 includes four independent communication sessions (communication sessions S1 to S4). The wireless IC tag 3 communicates with the antennas corresponding to the communication sessions S1 to S4 using the communication sessions S1 to S4, and the same management information is read or written by the reader / writer connected to the antenna. Done.

  When the wireless IC tag 3 enters the transmission radio wave arrival area of the antenna and receives a communication start command specifying the communication session and the maximum number of outgoing calls from the antenna, the wireless IC tag 3 can communicate with the antenna in the communication session. In order to prevent simultaneous transmission with other wireless IC tags, the wireless IC tag 3 sets a random number of transmission waiting times within the maximum number of transmission waiting times and enters a standby state. The wireless IC tag 3 receives from the antenna a subtraction command for subtracting the number of waiting times for transmission once. The wireless IC tag 3 transmits a response command to the antenna when the number of transmission waiting times becomes zero as a result of receiving the subtraction command a plurality of times.

  When the antenna receives a response command from the wireless IC tag 3, communication between the wireless IC tag 3 and the antenna is started. At this time, the reader / writer reads or writes management information of the wireless IC tag 3 through communication between the IC tag 3 and the antenna, and the wireless IC tag 3 ends the communication session. When the wireless IC tag 3 ends the communication session, the wireless IC tag 3 uses the communication session until the wireless IC tag 3 comes out of the transmission radio wave arrival area of the antenna and the power supply from the antenna is lost and the wireless IC tag 3 is reset. Communication is impossible.

  The wireless IC tag 3 transmits using the radio wave received from the antenna as the received radio wave. However, the received radio wave is consumed as electric power in the wireless IC tag 3, and when the wireless IC tag 3 transmits the outgoing radio wave representing the management information, the outgoing radio wave is not limited to the direction of the antenna, Radiated to the entire periphery of the wireless IC tag 3. Therefore, the reachable area of the radio wave of the wireless IC tag 3 is narrower than the reachable area of the radio wave transmitted by the antenna.

  Next, the antennas 11 to 22 will be described.

  For example, a plurality of passages A, B, and C extending in the first direction are provided in a warehouse or a store. The entrances of the passages A, B, and C are referred to as gates A, B, and C, respectively.

  On the first side surface (left side surface) of the passage A, antennas 11 and 13 are provided as a first antenna group in this order from the gate A toward the outlet. On the second side surface (right side surface) facing the first side surface of the passage A, antennas 12 and 14 are provided in this order from the gate A to the outlet as a second antenna group. The radio wave radiation surfaces of the antennas 11 to 14 are directed to the path A side.

  On the first side surface (left side surface) of the passage B, antennas 15 and 17 as a first antenna group are provided in this order from the gate B to the outlet. On the second side surface (right side surface) of the passage B, antennas 16 and 18 as a second antenna group are provided in this order from the gate B to the outlet. The radio wave radiation surfaces of the antennas 15 to 18 are directed to the path B side.

  On the first side surface (left side surface) of the passage C, antennas 19 and 21 as a first antenna group are provided in this order from the gate C to the outlet. On the second side surface (right side surface) of the passage C, antennas 20 and 22 as a second antenna group are provided in this order from the gate C to the outlet. The radio wave radiation surfaces of the antennas 19 to 22 are directed to the path C side.

  Next, the reader / writers 6 to 8 will be described.

  The reader / writer 6 transmits communication sessions S1, S3, S2, S4 and a communication start command specifying the maximum number of outgoing calls from the antennas 11 to 14, respectively. Thereafter, the reader / writer 6 transmits a subtraction command corresponding to the maximum number of outgoing calls, communicates with the wireless IC tag 3 whose number of outgoing calls is zero for each transmission, and obtains management information from the wireless IC tag 3. To do. When the reader / writer 6 finishes transmitting the subtraction command corresponding to the maximum number of outgoing calls, it again transmits a communication start command specifying the communication session and the maximum number of outgoing calls. By repeating this, the reader / writer 6 can communicate with the wireless IC tag 3 that has entered the communicable area of the antennas 11 to 14.

  The reader / writer 7 transmits communication sessions S1, S3, S2, S4 and a communication start command specifying the maximum number of outgoing calls from the antennas 15 to 18, respectively. Thereafter, the reader / writer 7 transmits a subtraction command corresponding to the maximum number of outgoing calls, communicates with the wireless IC tag 3 whose number of outgoing calls is zero for each transmission, and obtains management information from the wireless IC tag 3. To do. When the reader / writer 7 finishes transmitting the subtraction command for the maximum number of outgoing calls, it again transmits a communication start command specifying the communication session and the maximum number of outgoing calls. By repeating this, the reader / writer 7 can communicate with the wireless IC tag 3 that has entered the communicable area of the antennas 15 to 18.

  The reader / writer 8 transmits the communication sessions S1, S3, S2, S4 and the communication start command specifying the maximum number of outgoing calls from the antennas 19 to 22, respectively. Thereafter, the reader / writer 8 transmits a subtraction command corresponding to the maximum number of outgoing calls, communicates with the wireless IC tag 3 in which the number of outgoing calls is zero for each transmission, and obtains management information from the wireless IC tag 3. To do. When the reader / writer 8 finishes transmitting the subtraction command for the maximum number of outgoing calls, it again transmits a communication start command specifying the communication session and the maximum number of outgoing calls. By repeating this, the reader / writer 8 can communicate with the wireless IC tag 3 that has entered the communicable area of the antennas 19 to 22.

  Next, the control device 9 will be described.

  The control apparatus 9 has grasped | ascertained beforehand arrangement | positioning of the antennas 11-14, 15-18, 19-22. The control device 9 transmits communication session assignment instructions for assigning communication sessions S1, S3, S2, and S4 to the respective antennas to the reader / writers 6 to 8. In this case, the reader / writer 6 allocates the communication sessions S1, S3, S2, and S4 to the antennas 11 to 14 in response to the communication session allocation instruction. The reader / writer 7 allocates the communication sessions S1, S3, S2, and S4 to the antennas 15 to 18 in response to the communication session allocation instruction. The reader / writer 8 allocates the communication sessions S1, S3, S2, and S4 to the antennas 19 to 22 in response to the communication session allocation instruction. Thus, the arrangement of the antennas 11 to 14, 15 to 18, and 19 to 22 is the same for each of the communication sessions S1, S3, S2, and S4.

  The control device 9 transmits to the reader / writers 6 to 8 instructions for specifying the communication sessions S1, S3, S2, and S4 to the antennas 11 to 14, 15 to 18, and 19 to 22. This instruction is included in the communication start command.

  When the arrangement of the antennas 11 to 14, 15 to 18, and 19 to 22 in the passages A, B, and C is the same for each of the communication sessions S1, S3, S2, and S4, the antenna that is responsible for the same communication session (for example, the communication session) In the case of S1, the antennas 11, 15, 19) are arranged at the same positions on the first side surfaces of the passages A, B, C. Even if the radio IC tag in the adjacent passage is activated by the radio wave transmitted from the antenna and transmits the radio wave, the radio wave transmitted from the radio IC tag does not reach the antenna. For example, even if the leaked radio wave of the antenna 11 in charge of the communication session S1 of the passage A activates the wireless IC tag passing through the passage B, the radio wave transmitted from the wireless IC tag does not reach the antenna 11 of the passage A. The same applies to the antennas in charge of other communication sessions in the passage A.

  The control device 9 performs first to third transmissions in which at least one of a data rate, a data encoding method, and a modulation method is specified for each of the wireless IC tags 3 in the paths A, B, and C. A radio wave allocation instruction is transmitted to the reader / writers 6-8. The first to third transmission radio wave allocation instructions are included in the communication start command.

  The data rate is a data clock frequency. The data encoding method is a method of expressing data with a series of 1 or 0 codes. FIG. 5 shows data “M” and “2” which are two encoding methods of the mirror encoding method. The encoded representation of “001” is shown. The modulation method is a method for modulating a data-encoded signal, and includes ASK (Amplitude Shift Keying) modulation, PSK (Phase Shift Keying) modulation, and the like.

  For example, as shown in FIG. 6, in the path A, the data rate is M = 2, the data encoding method is the mirror encoding method, and the modulation method is ASK modulation. In path B, the data rate is M = 4, the data coding method is the mirror coding method, and the modulation method is PSK modulation. In this case, the data rate and the modulation method when the wireless IC tag transmits are different between the passage A and the passage B.

  When the data rate, data encoding method, and modulation method used when the wireless IC tag 3 transmits are different from the demodulation method, data decoding method, and data rate used when the reader / writer receives, the reader / writer transmits the modulation signal. It cannot be demodulated, a data-encoded signal cannot be decoded, or it cannot be synchronized with data. In this case, the reader / writer cannot communicate with the wireless IC tag 3 and cannot obtain management information of the wireless IC tag 3. In order to solve this, the reader / writer 6 transmits a communication start command including an instruction specifying the communication sessions S1, S3, S2, and S4 and a first outgoing radio wave allocation instruction from the antennas 11 to 14, respectively. When the communication sessions S1, S3, S2, and S4 of the wireless IC tag 3 in A enter the transmission radio wave arrival area of the antennas 11 to 14, respectively, the management information is transmitted according to the parameter specified by the first transmission radio wave allocation instruction. Transmitting radio waves to be transmitted are transmitted to the antennas 11-14. In this case, the reader / writer 6 receives outgoing radio waves by the antennas 11 to 14 according to the parameters specified by itself.

  Similarly, the reader / writer 7 transmits a communication start command including an instruction specifying the communication sessions S1, S3, S2, and S4 and a second outgoing radio wave allocation instruction from the antennas 15 to 18, respectively. When the communication sessions S1, S3, S2, and S4 of the tag 3 enter the transmission radio wave arrival area of the antennas 15 to 18, respectively, the transmission radio waves representing the management information are transmitted according to the parameters specified by the second transmission radio wave assignment instruction. It transmits to the antennas 15-18. In this case, the reader / writer 7 receives the outgoing radio wave by the antennas 15 to 18 according to the parameters specified by itself.

  Similarly, the reader / writer 8 transmits a communication start command including an instruction specifying the communication sessions S1, S3, S2, and S4 and a third outgoing radio wave allocation instruction from the antennas 19 to 22, respectively, and the wireless IC in the path C When the communication sessions S1, S3, S2, and S4 of the tag 3 enter the transmission radio wave arrival area of the antennas 19 to 22, respectively, the transmission radio wave representing the management information is transmitted according to the parameter specified by the third transmission radio wave assignment instruction. It transmits to the antennas 19-22. In this case, the reader / writer 8 receives the outgoing radio wave by the antennas 19 to 22 according to the parameters specified by itself.

  The control device 9 transmits the management information received from the reader / writers 6 to 8 to the warehouse management device 10. In this case, the control device 9 receives the management information received from the reader / writers 6-8, the gate identifier (gates A, B, C), the antenna identifier (antennas 11-14, 15-18, 19-22), and then Are associated with the reception time information representing the time of the time, and are generated as information addition management information.

  The control device 9 obtains management information from the same wireless IC tag 3 by a reader / writer (for example, the reader / writer 6 via the antennas 11 to 14 in the case of the passage A) via a plurality of antennas in one passage. Therefore, the control device 9 obtains a plurality of the same management information. Therefore, the control device 9 uses the identifier (the identifier of the wireless IC tag 3 or the identifier of the article, or both) in the management information included in the information addition management information described above in order to remove the duplicate management information. Referring to, when a plurality of management information including the same identifier exists, one management information is used from the management information including the same identifier. As a result, the control device 9 can obtain one management information for one wireless IC tag 3 in one passage. The control device 9 transmits information addition management information including the one management information to the storage management device 10 as management information in one passage.

  The entry / exit management device 10 manages entry / exit of articles based on the information addition management information from the control device 9.

  The control device 9 and the warehouse management device 10 can be realized by a circuit or a computer program. In the case of a computer program, the entry / exit management system according to the embodiment of the present invention further includes a computer, and the computer is an execution unit (not shown) that is a CPU (Central Processing Unit) and a storage that is a recording medium. (Not shown). The storage unit stores a computer program to be executed by a computer. The execution unit reads and executes the computer program from the storage unit at the time of startup or the like. In this case, the computer program includes a control program (control device 9) and a storage / exit management program (entry / exit management device 10).

[Operation]
The operation of the warehouse management system according to the embodiment of the present invention will be described.

  Here, it is assumed that the control device 9 is transmitting communication session assignment instructions for assigning communication sessions S1, S3, S2, and S4 to the respective antenna groups to the reader / writers 6-8. In this case, the reader / writer 6 allocates communication sessions S1, S3, S2, and S4 to the antennas 11 to 14 as antenna groups in response to the communication session allocation instruction. In response to the communication session assignment instruction, the reader / writer 7 assigns communication sessions S1, S3, S2, and S4 to the antennas 15 to 18 as antenna groups, respectively. The reader / writer 8 allocates communication sessions S1, S3, S2, and S4 to the antennas 19 to 22 as antenna groups in response to the communication session allocation instruction.

  In addition, the control device 9 includes, for each of the wireless IC tags 3 in the paths A, B, and C, first to first parameters in which at least one of a data rate, a data encoding scheme, and a modulation scheme is specified for each path. It is assumed that a 3-call radio wave allocation instruction is transmitted to the reader / writers 6-8. In this case, the reader / writer 6 transmits a communication start command including an instruction specifying the communication sessions S1, S3, S2, and S4 and a first outgoing radio wave allocation instruction from the antennas 11 to 14, respectively. A communication start command including an instruction specifying the communication sessions S1, S3, S2, and S4 and a second outgoing radio wave allocation instruction is transmitted from the antennas 15 to 18, respectively. The reader / writer 8 transmits the communication sessions S1, S3, S2, and A communication start command including an instruction in which S4 is specified and a third outgoing radio wave allocation instruction is transmitted from each of the antennas 19 to 22.

  The control device 9 is assumed to include a register as a storage unit for storing information. Or when the control apparatus 9 is realizable also with a computer program, the above-mentioned memory | storage part shall be used as a storage part.

  FIG. 2 is a top view of the carriage 1 passing through the gate A and moving on the passage A in the first direction.

  The plurality of wireless IC tags 3 on the carriage 1 enter the transmission radio wave arrival area of the antenna 11 when moved in the first direction on the path A through the gate A. In this case, the communication sessions S1 of the plurality of wireless IC tags 3 on the carriage 1 are the parameters (for example, data rate: M = 2, data encoding method: mirror encoding method, A transmission radio wave representing management information held by itself is transmitted to the antenna 11 according to (modulation method: ASK modulation). The reader / writer 6 receives outgoing radio waves from the plurality of wireless IC tags 3 on the carriage 1 by the antenna 11 according to the parameters specified by the reader / writer 6 and transmits a plurality of management information respectively represented by the plurality of outgoing radio waves to the control device 9. To do. The control device 9 includes a plurality of management information received from the reader / writer 6, a gate identifier for identifying the gate A, an antenna identifier for identifying the antenna 11, a communication session identifier for identifying the communication session S1, and a time at that time Are stored in the storage unit as information addition management information in association with each other.

  Similarly, when the plurality of wireless IC tags 3 on the carriage 1 pass through the gate A and are moved in the first direction on the path A, it is assumed that the transmission radio wave arrival area of the antenna 12 has entered. In this case, the communication sessions S3 of the plurality of wireless IC tags 3 on the carriage 1 are the parameters (data rate: M = 2, data encoding method: mirror encoding method, modulation method) specified by the first transmission radio wave assignment instruction. : ASK modulation) and a transmission radio wave representing management information held by itself is transmitted to the antenna 12. The reader / writer 6 receives outgoing radio waves from the plurality of wireless IC tags 3 on the carriage 1 by the antenna 12 according to the parameters specified by the reader / writer 6 and transmits a plurality of management information respectively represented by the plurality of outgoing radio waves to the control device 9. To do. The control device 9 includes a plurality of management information received from the reader / writer 6, a gate identifier for identifying the gate A, an antenna identifier for identifying the antenna 12, a communication session identifier for identifying the communication session S3, and a time at that time Are stored in the storage unit as information addition management information in association with each other.

  Here, in the path A, the region of the radio wave of the wireless IC tag 3 communicating with the antenna 11 in the communication session S1 reaches the back surface of the antenna 15 in the path B. The antenna 15 is in charge of the same communication session S1 as the antenna 11. However, the data rate, data encoding method, and modulation method parameters when the wireless IC tag 3 transmits in the path A are specified by the antenna 11 by the first transmission radio wave allocation instruction. In this case, even if the antenna 15 of the path B receives the radio wave transmitted from the wireless IC tag 3 in the path A, it cannot be demodulated and decoded, and the management information of the wireless IC tag 3 cannot be acquired in the path B.

  It is assumed that the plurality of wireless IC tags 3 on the carriage 1 enter the transmission radio wave arrival area of the antenna 13 when the wireless IC tags 3 are further moved on the path A in the first direction. In this case, the communication sessions S2 of the plurality of wireless IC tags 3 on the carriage 1 are the parameters (data rate: M = 2, data encoding method: mirror encoding method, modulation method) specified by the first transmission radio wave allocation instruction. : ASK modulation), a transmission radio wave representing the management information held by itself is transmitted to the antenna 13. The reader / writer 6 receives the transmission radio waves from the plurality of wireless IC tags 3 on the carriage 1 by the antenna 13 according to the parameters specified by the reader / writer 6 and transmits a plurality of management information respectively represented by the plurality of transmission radio waves to the control device 9. To do. The control device 9 includes a plurality of management information received from the reader / writer 6, a gate identifier for identifying the gate A, an antenna identifier for identifying the antenna 13, a communication session identifier for identifying the communication session S2, and a time at that time Are stored in the storage unit as information addition management information in association with each other.

  Similarly, when the plurality of wireless IC tags 3 on the carriage 1 pass through the gate A and are moved in the first direction on the path A, it is assumed that the transmission radio wave arrival area of the antenna 14 has entered. In this case, the communication session S4 of the plurality of wireless IC tags 3 on the carriage 1 includes the parameters (data rate: M = 2, data encoding method: mirror encoding method, modulation method) specified by the first transmission radio wave assignment instruction. : ASK modulation), a transmission radio wave representing the management information held by itself is transmitted to the antenna 14. The reader / writer 6 receives outgoing radio waves from the plurality of wireless IC tags 3 on the carriage 1 by the antenna 14 according to the parameters specified by the reader / writer 6 and transmits a plurality of management information respectively represented by the plurality of outgoing radio waves to the control device 9. To do. The control device 9 includes a plurality of management information received from the reader / writer 6, a gate identifier for identifying the gate A, an antenna identifier for identifying the antenna 14, a communication session identifier for identifying the communication session S4, and a time at that time Are stored in the storage unit as information addition management information in association with each other.

  FIG. 3 is a top view in which the carriage 1 passes through the gate A and moves on the passage A in the first direction, and simultaneously, the carriage 2 passes through the gate B and moves on the passage B in the first direction. It is.

  It is assumed that the transmission radio wave arrival area of the antenna 11 in the passage A reaches the wireless IC tag 4 in the passage B. The wireless IC tag 4 has the same function as the wireless IC tag 3. When the plurality of wireless IC tags 3 on the carriage 1 pass through the gate A and are moved in the first direction on the passage A, the plurality of wireless IC tags 4 on the carriage 2 simultaneously pass the gate B. It is assumed that the plurality of wireless IC tags 4 on the carriage 2 are communicating with the antenna 15 or the antenna 16 through the passage B and moved in the first direction. In addition, it is assumed that the leaked radio wave from the antenna 11 reaches a part of the wireless IC tags 4 on the carriage 2 in the passage B. In this case, a part of the wireless IC tags 4 includes an instruction specifying the communication session S1 and a first transmission radio wave assignment instruction (data rate: M = 2, data encoding method: mirror encoding method, modulation method: ASK modulation). ) Including the communication start command is received from the antenna 11, and the instructed data rate, data encoding method, and modulation method are set.

  When the wireless IC tag 4 has its own transmission order, the wireless IC tag 4 transmits the data at a set data rate: M = 2, data encoding method: mirror encoding method, modulation method: ASK modulation. The radio waves from the wireless IC tag 4 reach the antenna 15 in the passage B in charge of the communication session S1, the antenna 12 in the passage A in charge of the communication session S3, and the antenna 16 in the passage B in charge of the communication session S3. However, in the passages A and B, the antenna arrangement is the same for each communication session. For this reason, the radio wave transmitted from the wireless IC tag 4 does not reach the antenna 11 of the path A that has transmitted the communication start command including the instruction specifying the communication session S1.

  In the path B, the antenna 15 and the antenna 16 are different from those of the wireless IC tag 3 in that at least one parameter of the data rate, the data encoding method, and the modulation method of the transmission radio wave of the wireless IC tag 4 is different from that of the wireless IC tag 3. Cannot receive outgoing radio waves from 3. Further, in the passage A, the antenna 12 does not receive the outgoing radio wave from the wireless IC tag 4 because the communication session is different from that of the antenna 15. Therefore, the radio waves transmitted from some of the wireless IC tags 4 in the path B that started communication due to the leaked radio waves from the path A are not used in the paths A and B.

  FIG. 4 is a top view in which the carriage 1 passes through the gate A and moves on the passage A in the first direction, and at the same time, the carriage 2 passes through the gate B and moves on the passage B in the first direction. It is.

  It is assumed that the transmission radio wave arrival area of the antenna 16 in the passage B reaches the wireless IC tag 5 in the passage A. The wireless IC tag 5 is assumed to have the same function as the wireless IC tag 3. Further, when the plurality of wireless IC tags 5 on the carriage 1 pass through the gate A and are moved in the first direction on the passage A, the plurality of wireless IC tags on the carriage 2 simultaneously pass through the gate B. Then, it is assumed that the plurality of wireless IC tags 5 on the carriage 1 are communicating with the antenna 11 or the antenna 12 while being moved in the first direction on the passage B. In addition, it is assumed that the leaked radio wave from the antenna 16 has also reached some wireless IC tags 5 on the carriage 1 in the path A. In this case, a part of the wireless IC tags 5 includes an instruction specifying the communication session S3 and a second transmission radio wave assignment instruction (data rate: M = 4, data encoding method: mirror encoding method, modulation method: PSK modulation). ) Including the communication start command is received from the antenna 16 and the instructed data rate, data encoding method, and modulation method are set.

  When the wireless IC tag 5 is in its own transmission order, the wireless IC tag 5 transmits the data at a set data rate: M = 4, data encoding method: mirror encoding method, modulation method: PSK modulation. The radio wave from the wireless IC tag 5 reaches the antenna 11 of the passage A in charge of the communication session S3 and the antenna 15 of the passage B in charge of the communication session S1. However, in the passages A and B, the antenna arrangement is the same for each communication session. For this reason, the radio wave transmitted from the wireless IC tag 5 does not reach the antenna 16 of the path B that has transmitted the communication start command including the instruction in which the communication session S3 is specified.

  In the path A, the antenna 11 and the antenna 12 are different from those of the wireless IC tag on the carriage 2 in that at least one parameter of the data rate, the data encoding method, and the modulation method of the transmission radio wave of the wireless IC tag 5 is different from that of the carriage 2. Unable to receive outgoing radio waves from the above wireless IC tag. In the path B, the antenna 15 does not receive a radio wave transmitted from the wireless IC tag 3 because the communication session is different from that of the antenna 12. Accordingly, the radio waves transmitted from some of the wireless IC tags 5 in the path A that started communication due to leaked radio waves from the path B are not used in the paths A and B.

  The control device 9 reads a plurality of information addition management information in the passage A from the storage unit, and removes the duplicate management information from the identifier in the management information included in the information addition management information (the identifier of the wireless IC tag 3). , Or the identifier of the article, or both). Here, when there are a plurality of management information including the same identifier, the control device 9 selects one management information from the management information including the same identifier. The control device 9 transmits information addition management information including the one management information to the storage management device 10 as management information in the passage A.

  The entry / exit management device 10 passes through the gates A and B using the management information, the gate identification symbols (gates A and B), and the reception time information included in the information addition management information in the passages A and B. , Carry in / out management of goods moved on B.

[effect]
The effect of the warehouse management system by embodiment of this invention is demonstrated.

  According to the storage / retrieval management system according to the embodiment of the present invention, at least one of the data rate, the data encoding method, and the modulation method of the radio wave transmitted from the wireless IC tag is different for each path. Thereby, even if the wireless IC tag moving on the path A is activated by the leaked radio wave of the adjacent path B, the radio wave transmitted from the wireless IC tag is not used in the path A.

  In addition, according to the storage / retrieval management system according to the embodiment of the present invention, the wireless IC tag has a plurality of communication sessions, the antennas of each passage are in charge of different communication sessions, and the antenna arrangement is communicated in each passage Same for each session. As a result, even if the wireless IC tag passing through the adjacent passage B is activated by the leaked radio wave of the passage A, the radio wave transmitted from the wireless IC tag does not reach the antenna that has transmitted the leaked radio wave of the passage A. Because the communication session of this antenna is different, it does not use the radio wave transmitted by the wireless IC tag.

  Therefore, according to the warehouse management system according to the embodiment of the present invention, the management information of the wireless IC tag moving on the passage can be acquired only by the passage.

  The present invention is applied to storage management of articles such as stores and warehouses.

1, 2 carts,
3-5 wireless IC tag,
6-8 reader / writer,
9 Control device,
10 Entry / exit management device,
11-22 antenna,
S1-S4 communication session,

Claims (15)

A plurality of antennas provided in each of the plurality of passages extending in the first direction;
The management information provided in the article, holding management information about the article, and entering the transmission radio wave arrival area of the plurality of antennas when being moved in the first direction on the plurality of passages. A wireless IC tag that transmits an outgoing radio wave representing
A plurality of reader / writers for receiving the transmission radio wave from the wireless IC tag by the plurality of antennas and transmitting the management information represented by the transmission radio wave;
A control device for receiving the management information from the plurality of reader / writers,
The outgoing radio wave of the wireless IC tag is an entry / exit management system in which at least one of a data rate, a data encoding method, and a modulation method is different for each passage. The control device, for each of the wireless IC tags in the plurality of paths, a plurality of transmission radio wave allocation instructions in which at least one of a data rate, a data encoding scheme, and a modulation scheme is specified for each path Sending to the plurality of reader / writers,
Each of the plurality of reader / writers transmits the plurality of outgoing radio wave allocation instructions from the plurality of antennas,
When the wireless IC tags in the plurality of passages enter the transmission radio wave arrival area of the plurality of antennas, respectively, the radio wave representing the management information is transmitted according to the parameter specified by the plurality of transmission radio wave allocation instructions. Outgoing,
The plurality of reader / writers respectively receive the outgoing radio wave from the wireless IC tag by the plurality of antennas according to parameters specified by the reader / writer, and transmit the management information represented by the outgoing radio wave. Entry / exit management system. The wireless IC tag includes a plurality of communication sessions,
Each of the plurality of antennas is an entry / exit management system according to claim 1 or 2, including an antenna group to which the plurality of communication sessions are assigned. The control device transmits a communication session allocation instruction for allocating the plurality of communication sessions to each of the antenna groups to the plurality of reader / writers,
The warehouse management system according to claim 3, wherein each of the plurality of reader / writers allocates the plurality of communication sessions to the antenna group in response to the communication session allocation instruction. 5. The warehouse management system according to claim 3 or 4, wherein the antenna group is arranged in the same manner for each communication session. Each of the plurality of reader / writers receives the transmission radio wave representing the management information from the antenna group, and transmits it to the control device as a plurality of the management information.
Each of the plurality of management information includes an identifier,
The control device receives the plurality of management information transmitted from each of the plurality of reader / writers, and when there are a plurality of management information including the same identifier, in order to remove the duplicate management information, the same identifier 6. The storage management system according to any one of claims 3 to 5, wherein one management information is selected from management information including A plurality of antennas provided in each of the plurality of passages extending in the first direction;
The management information provided in the article, holding management information about the article, and entering the transmission radio wave arrival area of the plurality of antennas when being moved in the first direction on the plurality of passages. A wireless IC tag that transmits an outgoing radio wave representing
A plurality of reader / writers for receiving the transmission radio wave from the wireless IC tag by the plurality of antennas and transmitting the management information represented by the transmission radio wave;
A control device for receiving the management information from the plurality of reader / writers,
The wireless IC tag includes a plurality of communication sessions,
Each of the plurality of antennas is an entry / exit management system including an antenna group to which the plurality of communication sessions are assigned. The control device transmits a communication session allocation instruction for allocating the plurality of communication sessions to each of the antenna groups to the plurality of reader / writers,
The entry / exit management system according to claim 7, wherein each of the plurality of reader / writers allocates the plurality of communication sessions to the antenna group in accordance with the communication session allocation instruction. The entry / exit management system according to claim 7 or 8, wherein the arrangement of the antenna groups is the same for each communication session. Each of the plurality of reader / writers receives the transmission radio wave representing the management information from the antenna group, and transmits it to the control device as a plurality of the management information.
Each of the plurality of management information includes an identifier,
The control device receives the plurality of management information transmitted from each of the plurality of reader / writers, and when there are a plurality of management information including the same identifier, in order to remove the duplicate management information, the same identifier 10. The storage management system according to claim 7, wherein one management information is selected from management information including The entry / exit management system according to any one of claims 7 to 10, wherein at least one of a data rate, a data encoding method, and a modulation method is different for each path of the outgoing radio wave of the wireless IC tag. The control device, for each of the wireless IC tags in the plurality of paths, a plurality of transmission radio wave allocation instructions in which at least one of a data rate, a data encoding scheme, and a modulation scheme is specified for each path Sending to the plurality of reader / writers,
Each of the plurality of reader / writers transmits the plurality of outgoing radio wave allocation instructions from the plurality of antennas,
When the wireless IC tags in the plurality of passages enter the transmission radio wave arrival area of the plurality of antennas, respectively, the radio wave representing the management information is transmitted according to the parameter specified by the plurality of transmission radio wave allocation instructions. Outgoing,
The plurality of reader / writers respectively receive the transmission radio wave from the wireless IC tag by the plurality of antennas according to parameters specified by the plurality of reader / writers, and transmit the management information represented by the transmission radio wave. Entry / exit management system. A plurality of antennas provided in each of a plurality of passages extending in the first direction, a wireless IC tag provided in an article and holding management information relating to the article, and a plurality of reader / writers connected to the plurality of antennas And a control device connected to the plurality of reader / writers,
A step of transmitting a transmission radio wave representing the management information when the wireless IC tag enters a transmission radio wave arrival area of the plurality of antennas while being moved in the first direction on the plurality of paths. When,
Each of the plurality of reader / writers receiving the outgoing radio wave from the wireless IC tag by the plurality of antennas, and transmitting the management information represented by the outgoing radio wave;
The control device receiving the management information from the reader / writers;
A storage management method comprising the step of setting the outgoing radio wave of the wireless IC tag so that at least one of a data rate, a data encoding method, and a modulation method is different for each path. A plurality of antennas provided in each of a plurality of passages extending in the first direction, a wireless IC tag provided in an article and holding management information relating to the article, and a plurality of reader / writers connected to the plurality of antennas And a control device connected to the plurality of reader / writers,
A step of transmitting a transmission radio wave representing the management information when the wireless IC tag enters a transmission radio wave arrival area of the plurality of antennas while being moved in the first direction on the plurality of paths. When,
Each of the plurality of reader / writers receiving the outgoing radio wave from the wireless IC tag by the plurality of antennas, and transmitting the management information represented by the outgoing radio wave;
The control device receives the management information from the plurality of reader / writers, wherein the wireless IC tag includes a plurality of communication sessions, and each of the plurality of antennas includes an antenna group,
The control device comprises a step of allocating the plurality of communication sessions to the antenna group.   A computer program which is applied to the storage / exit management method according to claim 13 or 14 and causes a computer to execute each step executed by the control device.

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