JP2012004919A - Radio communication device, electronic bin tag, radio communication method, radio communication program and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication device, an electronic bin tag, a radio communication method, a radio communication program and a recording medium capable of suppressing increase of an information amount during communication and reducing power consumption.SOLUTION: A slave unit radio communication part 11 receives a signal transmitted from a bin tag master unit 2 or another electronic bin tag 1 in communication between the bin tag master unit 2 and the another electronic bin tag 1, and performs radio communication with further one bin tag master unit 2 as a communication partner. A analysis part 31 analyzes the signal received by the slave unit radio communication part 11. A slave unit communication planning part 32 creates a communication plan concerning time of radio communication between the slave unit radio communication part 11 and the communication partner based on an analysis result of the analysis part 31. A slave unit communication control part 33 switches a state of the slave unit radio communication part 11 based on the communication planning information and time information output by the slave unit timer part 15 between a communication possible state in which the communication with the communication partner is possible, and a standby state in which the communication with the communication partner is not performed and stands by.

Description

  The present invention is capable of performing wireless communication with a parent device, and enters a standby state when wireless communication is not performed, thereby reducing power consumption, an electronic shelf label, a wireless communication method, and wireless communication The present invention relates to a communication program and a recording medium.

  In recent years, supermarkets and department stores use electronic shelf labels that can display product information such as product names and prices electronically. This electronic shelf label is installed for each type of product and can be updated to new product information sent from the shelf label management device by wire or wirelessly, so it is possible to omit the work of manually changing the price tag. it can.

  The electronic shelf label is driven using a battery or an external power source as a power source. Electronic shelf labels are placed on store shelves instead of price tags, so when driven by an external power supply, it is necessary to process the power supply line so that it is not visible from the outside as much as possible. It becomes a big problem.

  In addition, when using a battery, although the problem of the power supply line is solved, the amount of power that can be supplied from the battery is limited. Therefore, it is necessary to replace the battery, and handling such as replacement work becomes a problem. Technology has been developed to reduce the frequency of battery replacement by reducing the power consumption of electronic shelf labels.

  The electronic shelf label system according to the first prior art includes an electronic shelf label and a management device. The electronic shelf label includes a receiving unit that receives price data from the management device, a power supply unit that supplies power to the receiving unit, a normal mode that supplies a predetermined amount of power from the power supply unit to the receiving unit, and a predetermined power And an operation mode control means for switching between two modes of a power saving mode in which an amount of power smaller than the amount is supplied from the power supply means to the receiving unit. The management device includes mode change command transmission means for transmitting a wakeup command for changing the electronic shelf label from the power saving mode to the normal mode. The electronic shelf label can return to the normal mode when receiving a wake-up command from the management device, and receive price data from the management device even if the power consumption is reduced in the power saving mode (for example, patents). Reference 1).

JP 2008-11972 A

  The electronic shelf label system according to the first prior art is configured to always transmit a wake-up command before transmitting price data from the management device to the electronic shelf label. Therefore, since the management apparatus must transmit a wake-up command to the electronic shelf label in addition to the price data, there is a problem that the amount of information during communication increases.

  An object of the present invention is to provide a wireless communication device, an electronic shelf label, a wireless communication method, a wireless communication program, and a recording medium that can suppress an increase in the amount of information during communication and reduce power consumption.

The present invention provides a receiving unit that receives a signal transmitted from at least one parent device or a child device of one or more parent devices and one or more child devices that can communicate with the parent device. When,
When the signal is received by the receiving unit, the received signal is analyzed, and an analysis unit that outputs information represented by the signal as an analysis result;
A communication unit that performs wireless communication using one parent device as a communication partner among the one or more parent devices;
Based on the analysis result output by the analysis unit, a communication plan creation unit that creates a communication plan related to time for wireless communication between the communication unit and the communication partner,
A communication plan storage unit for storing communication plan information representing a communication plan created by the communication plan creation unit;
A timekeeping unit that outputs time information representing the passage of time;
Based on the communication plan information stored in the communication plan storage unit and the time information output by the time measuring unit, the communication unit is in a communicable state in which communication with the communication partner is possible, and A wireless communication apparatus comprising: a communication control unit that switches to a standby state in which the communication partner is in standby without performing communication with a communication partner.

  Further, according to the present invention, when the analysis unit performs communication a plurality of times between any one of the one or more parent devices and any one of the one or more child devices, Based on the signal received by the receiving unit and time information from the time measuring unit, the time interval of the plurality of times of communication is measured, and the value of the measured time interval is output as the analysis result. And

  Further, according to the present invention, the communication plan creation unit receives the information represented by the signal received by the reception unit when the analysis unit analyzes that the information represented by the signal is information on a default communication plan determined for a slave unit. A communication plan is created based on the predetermined communication plan.

In the present invention, a plurality of the master units are installed with a predetermined distance therebetween.
The receiving unit receives signals from a plurality of the base units,
A signal strength measuring unit that measures a signal strength representing the strength of the signal for the signal from each of the parent devices received by the receiving unit;
A signal strength comparison unit that compares the magnitude of each signal strength measured by the signal strength measurement unit,
The communication control unit determines, as the communication partner, a parent device that has transmitted a signal indicating a maximum signal strength among a plurality of signal strengths compared by the signal strength comparison unit.

Further, in the present invention, the signal strength measuring unit measures the signal strength of signals transmitted from a plurality of parent devices including the communication partner at predetermined time intervals,
A difference value is calculated by subtracting the latest signal strength of the communication partner from any one of the past signal strengths of the communication partner measured by the signal strength measurement unit, and the difference value is calculated from a predetermined threshold value. Further includes a signal strength determination unit for determining whether or not
The communication control unit indicates a maximum signal strength among a plurality of signal strengths measured by the signal strength measurement unit when the signal strength determination unit determines that the difference value is larger than a predetermined threshold. The parent device that has transmitted the signal is determined as a new communication partner.

The present invention also provides the wireless communication device;
A display unit capable of displaying character information,
The communication unit receives information on a product name and a product price of a predetermined product from the parent device,
The display unit is an electronic shelf label that displays information on a product name and a product price received by the communication unit.

Further, the present invention provides a receiving unit that receives a signal transmitted from at least any one of the one or more master units and one or more slave units communicable with the master unit. A receiving step for receiving by:
When the signal is received in the receiving step, an analysis step of analyzing the received signal and outputting information represented by the signal as an analysis result;
Based on the analysis result output in the analysis step, wireless communication is performed between a communication unit that performs wireless communication using one of the one or more parent devices as a communication partner and the communication partner. A communication plan creation process for creating a communication plan for time;
A communication plan storage step for storing communication plan information representing the communication plan created in the communication plan creation step in a communication plan storage unit;
A time measuring process for outputting time information representing the passage of time by a time measuring unit;
Based on the communication plan information stored in the communication plan storage step and the time information output in the timing step, the communication unit is in a communicable state in which communication with the communication partner is possible, and And a communication control step of switching to a standby state for waiting without performing communication with a communication partner.

The present invention also provides a computer.
Receiving step of receiving a signal transmitted from at least any one of the one or more parent devices and one or more child devices communicable with the parent device by the receiving unit. When,
When the signal is received in the receiving step, an analysis step of analyzing the received signal and outputting information represented by the signal as an analysis result;
Based on the analysis result output in the analysis step, wireless communication is performed between a communication unit that performs wireless communication using one of the one or more parent devices as a communication partner and the communication partner. A communication plan creation process for creating a communication plan for time;
A communication plan storage step for storing communication plan information representing the communication plan created in the communication plan creation step in a communication plan storage unit;
A time measuring process for outputting time information representing the passage of time by a time measuring unit;
Based on the communication plan information stored in the communication plan storage step and the time information output in the timing step, the communication unit is in a communicable state in which communication with the communication partner is possible, and A wireless communication program for executing a communication control step of switching to a standby state in which the communication partner is in standby without performing communication with a communication partner.

  The present invention is also a computer-readable recording medium on which the wireless communication program is recorded.

  According to the present invention, the wireless communication device includes a reception unit, an analysis unit, a communication unit, a communication plan creation unit, a communication plan storage unit, a timing unit, and a communication control unit. The receiving unit receives a signal transmitted from at least one of the one or more parent devices and one or more child devices communicable with the parent device. When the signal is received by the receiving unit, the analyzing unit analyzes the received signal and outputs information represented by the signal as an analysis result. The communication unit performs wireless communication using one parent device as a communication partner among one or a plurality of parent devices. The communication plan creation unit creates a communication plan related to the time for performing wireless communication between the communication unit and the communication partner based on the analysis result output by the analysis unit. The communication plan storage unit stores communication plan information representing the communication plan created by the communication plan creation unit. The time measuring unit outputs time information indicating the passage of time. The communication control unit, based on the communication plan information stored in the communication plan storage unit and the time information output by the time measuring unit, the state of the communication unit, the communicable state capable of communication with the communication partner, It switches to the standby state where it waits without performing communication with the communication partner.

  Accordingly, the wireless communication device can monitor communication between the parent device and the child device and can self-learn when to perform communication between the wireless communication device and the parent device. Therefore, the wireless communication device can predict the time when the parent device transmits information to the child device as the time when the parent device transmits information to the wireless communication device. Thus, the wireless communication apparatus can reduce power consumption by switching to the standby state at a time when communication with the parent device is predicted not to be performed. The wireless communication device can receive information from the parent device by switching to a receivable state at a time when communication with the parent device is expected to be performed.

  Further, the wireless communication device can create a communication plan without having the communication plan transmitted from the parent device. Thereby, the wireless communication apparatus can suppress an increase in the amount of information in communication with the parent device.

  Further, according to the present invention, the analysis unit receives a signal when communication is performed a plurality of times between any one of the one or more master devices and any one of the one or more slave devices. Based on the signal received by the unit and the time information from the time measuring unit, the time interval of a plurality of communications is measured. The analysis unit outputs the measured time interval value as an analysis result.

  Thus, when the parent device communicates with each child device at a constant time interval, the wireless communication device can create a communication plan for switching between the transmittable state and the standby state at this time interval. Therefore, the wireless communication apparatus can perform communication with the parent device during a time zone in which the parent device communicates with each child device. Thus, the wireless communication apparatus can reliably receive information transmitted from the parent device.

  Further, according to the present invention, the communication plan creation unit, when the information represented by the signal received by the reception unit is information of the default communication plan determined in the slave unit, is analyzed by the analysis unit, the received default Create a communication plan based on the communication plan.

  As a result, when the base unit communicates with the handset at a predetermined time, the wireless communication device creates a communication plan in a short time by using the specified communication plan of the handset as its own communication plan. can do. Therefore, the wireless communication apparatus can perform communication with the parent device during a time zone in which the parent device communicates with each child device. Therefore, the wireless communication apparatus can reliably receive information transmitted from the parent device.

  Further, according to the present invention, a plurality of master units are installed at a predetermined distance. The receiving unit receives signals from a plurality of parent devices. The signal strength measuring unit measures the signal strength representing the signal strength for the signal from each parent device received by the receiving unit. The signal strength comparison unit compares the magnitudes of the signal strengths measured by the signal strength measurement unit. The communication control unit determines, as a communication partner, a parent device that has transmitted a signal indicating the maximum signal strength among a plurality of signal strengths compared by the signal strength comparison unit.

  As a result, the wireless communication apparatus can determine the optimum communication partner from the plurality of parent devices even when a plurality of parent devices are installed. Therefore, since the wireless communication apparatus performs communication with the parent device that exhibits the maximum signal strength, that is, the communication partner, stable wireless communication can be performed.

  Further, according to the present invention, the signal strength measuring unit measures the signal strength of signals transmitted from a plurality of parent devices including a communication partner at predetermined time intervals. The signal strength determination unit calculates a difference value by subtracting the latest signal strength of the communication partner from any one of the past signal strengths of the communication partner measured by the signal strength measurement unit. It is determined whether or not it is larger than a predetermined threshold value. The communication control unit transmits a signal indicating the maximum signal strength among the plurality of signal strengths measured by the signal strength measurement unit when the difference value is determined to be larger than a predetermined threshold by the signal strength determination unit. The master unit is determined as a new communication partner.

  Thus, the wireless communication device can determine whether the distance from the parent device has changed, that is, whether the wireless communication device has moved, by determining whether the signal strength has changed. Therefore, the wireless communication apparatus can determine a new communication partner from among the plurality of parent devices even if the wireless communication device moves and cannot communicate with the communication partner.

  According to the invention, the electronic shelf label includes a wireless communication device and a display unit capable of displaying character information. The communication unit receives information on a product name and a product price of a predetermined product from the parent device. The display unit displays the product name and product price information received by the communication unit.

  As a result, even if the electronic shelf label is newly installed or moved in the store, for example, and the communication partner is not known, the electronic shelf label is placed between the slave device and the parent device installed in the vicinity of itself. Communication is performed, self-learning is performed, and communication partners can be determined from a plurality of master units. Therefore, the electronic shelf label can receive the product information from an appropriate communication partner and display the product name and the product price. In addition, the electronic shelf label can reduce power consumption by predicting a time during which communication with the parent device is not performed by self-learning and setting the electronic shelf label in a standby state at this time.

  According to the invention, the wireless communication method includes a reception process, an analysis process, a communication plan creation process, a communication plan storage process, a timing process, and a communication control process. In the reception step, the reception unit receives a signal transmitted from at least one of the one or more master units and one or more slave units communicable with the master unit. To do. In the analysis step, when a signal is received in the reception step, the received signal is analyzed, and information represented by the signal is output as an analysis result. In the communication plan creation process, based on the analysis result output in the analysis process, a wireless communication is performed between a communication unit that performs wireless communication using one of the parent devices as a communication partner, and the communication partner. Create a communication plan for communication time. In the communication plan storage step, communication plan information representing the communication plan created in the communication plan creation step is stored in the communication plan storage unit. In the time measuring step, time information indicating the passage of time is output by the time measuring unit. In the communication control process, based on the communication plan information stored in the communication plan storage process and the time information output in the timing process, the communication unit is in a communicable state in which communication with the communication partner is possible, It switches to the standby state where it waits without performing communication with the communication partner.

  Thereby, in the wireless communication method, it is possible to monitor communication between the parent device and the child device and to self-learn when to perform communication between the wireless communication device and the parent device. Therefore, in the wireless communication method, the time for the parent device to transmit information to the child device can be predicted as the time for the parent device to transmit information to the wireless communication device. Thus, in the wireless communication method, the power consumption can be reduced by switching the communication unit to the standby state at a time when it is predicted that communication with the parent device will not be performed. In the wireless communication method, information from the parent device can be received by switching the communication unit to a receivable state at a time when communication with the parent device is expected to be performed.

  In the wireless communication method, the communication plan can be created without having the communication plan transmitted from the parent device. Thereby, in the wireless communication method, an increase in the amount of information can be suppressed in communication with the parent device.

  According to the invention, the wireless communication program causes a computer to execute a reception step, an analysis step, a communication plan creation step, a communication plan storage step, a timing step, and a communication control step of the wireless communication method. . Thus, it is possible to provide a program for causing a computer to execute each step of the wireless communication method.

  According to the invention, the wireless communication program is recorded on a computer-readable recording medium. Thereby, it can be provided as a computer-readable recording medium in which the wireless communication program is recorded.

It is a figure showing composition of electronic shelf label system 6 including electronic shelf label 1 concerning a 1st embodiment of the present invention. It is a block diagram which shows the structure of the electronic shelf label 1 which concerns on 1st Embodiment of this invention. It is a figure which shows an example of the subunit | mobile_unit information. It is a block diagram which shows the structure of the shelf label main | base station 2 contained in the electronic shelf label system 6. FIG. It is a block diagram which shows the structure of the shop server 3 contained in the electronic shelf label system 6. FIG. It is a figure which shows an example of arrangement | positioning of the electronic shelf label 1 in a shop. It is a figure which shows the transition of the operation state of the electronic shelf label. 4 is a flowchart showing a part of processing of the electronic shelf label 1. It is a flowchart which shows the remainder of the process of the electronic shelf label 1. It is a flowchart which shows the process of the shelf label main | base station 2. FIG. It is a flowchart which shows the process of the shop server 3. FIG.

  FIG. 1 is a diagram showing a configuration of an electronic shelf label system 6 including an electronic shelf label 1 according to the first embodiment of the present invention. The electronic shelf label system 6 includes electronic shelf labels 1a to 1i, shelf label master units 2a to 2c, and a store server 3. Hereinafter, the respective shelf label master units 2a to 2c are collectively referred to as “shelf label master unit 2”, and the respective electronic shelf labels 1a to 1i are collectively referred to as “electronic shelf label 1”.

  The electronic shelf label system 6 is installed in stores such as department stores and supermarkets. In the store, one or more types of products are displayed, and the electronic shelf label 1 is arranged in the vicinity of each product and displays a product name, a product price, and the like. Hereinafter, the electronic shelf label is also referred to as a “shelf label slave”.

  The store server 3 is connected to three shelf label master units 2a to 2c via a LAN (Local Area Network) 8 and communicates with each shelf label master unit 2a to 2c. The shelf label masters 2a to 2c are installed in the vicinity of the shelf on which the electronic shelf labels 1a to 1i are arranged, for example, on the ceiling of a store. A plurality of shelf label master units 2a to 2c are installed at a predetermined distance in the horizontal direction, for example, 5 to 40 m.

  The shelf label master unit 2a performs wireless communication with the three electronic shelf labels 1a to 1c, and the shelf label master unit 2b performs wireless communication with the three electronic shelf labels 1d to 1f. The shelf label master 2c performs wireless communication with the three electronic shelf labels 1g to 1i. In another embodiment, the electronic shelf label system 6 may be configured by using any number of electronic shelf labels 1 and the shelf label master unit 2 of one or more.

  FIG. 2 is a block diagram showing the configuration of the electronic shelf label 1 according to the first embodiment of the present invention. The electronic shelf label 1 includes a wireless communication device 5 and a display unit 17. The wireless communication device 5 includes a slave unit wireless communication unit 11, a slave unit control unit 12, a slave unit storage unit 13, a battery 14, a slave unit timer unit 15, and a sensor 16.

  The slave unit wireless communication unit 11 includes a slave unit antenna 21 and a slave unit transmission / reception control circuit 22. The slave unit control unit 12 includes an analysis unit 31, a slave unit communication plan creation unit 32, a slave unit communication control unit 33, a signal strength measurement unit 34, a signal strength comparison unit 35, a signal strength determination unit 36, Display control unit 37. The handset storage unit 13 stores a handset control program 41, handset information 42, and handset communication schedule information 43.

  The slave unit antenna 21 transmits and receives signals to and from the shelf label master unit 2 wirelessly. The slave unit transmission / reception control circuit 22 is connected to the slave unit antenna 21 and the slave unit control unit 12. The slave unit transmission / reception control circuit 22 sends the information represented by the signal received by the slave unit antenna 21 to the slave unit control unit 12 and transmits the signal represented by the information transmitted from the slave unit control unit 12 to the slave unit antenna 21.

  The slave unit wireless communication unit 11 functions as a reception unit and can communicate with one or a plurality of shelf label master units 2 and the shelf label master unit 2, that is, other electronic shelf labels 1. A signal transmitted from at least one of the shelf label master unit 2 or the other electronic shelf label 1 is received. Further, the slave unit wireless communication unit 11 functions as a communication unit, and performs wireless communication using one shelf label master unit 2 as a communication partner among one or a plurality of shelf label master units 2, and determines a predetermined product. Information on the product name and product price is received from the shelf label base unit 2.

  The subunit | mobile_unit control part 12 is implement | achieved by CPU (Central Processing Unit: Central processing unit) which is not shown in figure, and when the CPU executes the subunit | mobile_unit control program 41 memorize | stored in the subunit | mobile_unit memory | storage part 13, the electronic shelf label 1 whole To control the operation.

  When a signal is received by the receiving unit, the analyzing unit 31 analyzes the received signal and outputs information represented by the signal as an analysis result. The subunit | mobile_unit communication plan preparation part 32 produces the communication plan regarding the time which performs radio | wireless communication between the subunit | mobile_unit radio | wireless communication part 11 and a communicating party based on the analysis result which the analysis part 31 output.

  The slave unit communication control unit 33 controls wireless communication between the slave unit transmission / reception control circuit 22 and the slave unit antenna 21 with the shelf label master unit 2. Further, the slave unit communication control unit 33 is configured to change the state of the communication unit based on the communication plan information stored in the communication plan storage unit and the time information output by the timing unit so that communication with the communication partner can be performed. The state is switched between a possible state and a standby state in which communication with the communication partner is not performed.

  The signal strength measuring unit 34 measures the signal strength representing the signal strength of the signal from each shelf label master unit 2 received by the slave unit wireless communication unit 11. The signal strength comparison unit 35 compares the magnitudes of the signal strengths measured by the signal strength measurement unit 34.

  The signal strength determination unit 36 calculates a difference value by subtracting the latest signal strength of the communication partner from any one of the past signal strengths of the communication partner measured by the signal strength measurement unit 34. Is greater than a predetermined threshold value. The display control unit 37 converts the information transmitted from the shelf label master 2 into image data, and causes the display unit 17 to display the converted image data.

  The slave unit storage unit 13 that is a communication plan storage unit is realized by a semiconductor memory or the like, and is connected to the slave unit control unit 12. The subunit | mobile_unit information 42 is the information regarding the electronic shelf label 1, and is explained in full detail later using FIG.

  The slave unit communication schedule information 43 that is communication plan information is information that represents a communication plan related to the time for wireless communication with the shelf label master unit 2 of the communication partner. The slave unit communication schedule information 43 is a schedule regarding the time for switching the slave unit wireless communication unit 11 from the operation state to the standby state and switching from the standby state to the operation state.

  The slave unit storage unit 13 stores the signal strength value measured by the signal strength measurement unit 34 in a state associated with information for identifying the shelf label master unit 2 that has transmitted the signal. Further, in the child device storage unit 13, the ambient temperature value, the illuminance value, and the battery 14 voltage value measured by the sensor 16 are stored in a state associated with the time information indicating the measured time.

  The battery 14 is connected to the slave controller 12 and supplies power to the entire electronic shelf label 1. The slave unit timer unit 15 functions as a timer unit, and is realized by, for example, an RTC (Real Time Clock). The slave unit timer unit 15 outputs time information representing the passage of time and sends it to the slave unit controller 12. The slave unit timer unit 15 functions as a clock and a timer.

  The sensor 16 includes a temperature sensor, an illuminance sensor, and a voltage sensor. The temperature sensor measures the temperature around the electronic shelf label 1 and sends the measurement result to the handset controller 12. The illuminance sensor measures the illuminance around the electronic shelf label 1 and sends the measurement result to the slave control unit 12. As a result, the display control unit 37 can perform image quality adjustment on the display unit 17 according to the ambient illuminance. The voltage sensor measures the voltage of the battery 14 and sends the measurement result to the handset controller 12. Thereby, the subunit | mobile_unit control part 12 can estimate the residual amount of the battery 14. FIG.

  The display unit 17 can display character information, and displays the product name and product price information received by the slave unit wireless communication unit 11. The display unit 17 is realized by a memory type liquid crystal display device, for example. The memory-type liquid crystal display device only needs to supply power at the time of rewriting the display image, and once the image such as product information is displayed, the orientation of the liquid crystal is maintained so that the same image is displayed until it is rewritten. It is possible to reduce power consumption necessary for displaying product information.

  FIG. 3 is a diagram showing an example of the slave unit information 42. The handset information 42 includes, as items, “TAG ID”, “RF ADDRESS”, “TAG usage status”, “TAG usage environment”, “product information / price information”, and “TAG shelf position information”. And “TAG movement history”, “number of TAG communications”, and “TAG estimated battery remaining amount”. TAG means the electronic shelf label 1.

  The TAG ID is TAG, that is, identification information unique to the electronic shelf label 1. RF ADDRESS is information relating to a radio frequency used for communication with the shelf label parent device 2 of the communication partner. The TAG usage status indicates whether or not the electronic shelf label 1 is currently being used. For example, it indicates whether the electronic shelf label 1 is in a state where it is used in a store or a warehouse, or is in a state where it is not collected and used in a backyard.

  The TAG usage environment is information about an environment where the electronic shelf label 1 is used. For example, when the electronic shelf label 1 is used in a retail store, the TAG usage environment indicates which shelf, such as a room temperature shelf or a freezing shelf, is used, and the electronic shelf label 1 is used in a factory. If the electronic shelf label 1 is used in a warehouse, it indicates in which warehouse, such as a normal warehouse or a freezer, the normal process or an aging process. Indicates whether it is placed. The TAG usage environment may represent the number of shelf label master units 2 with which the electronic shelf label 1 can communicate.

  The product information / price information represents attributes, names, prices, etc. of predetermined products arranged in the vicinity of the electronic shelf label 1. The TAG shelf position information represents detailed position information such as “fourth upper row of row A”.

  The TAG movement history represents the history of the location and date / time at which the electronic shelf label 1 has been installed in the past. For example, if the electronic shelf label 1 is used in a retail store, the TAG movement history is “registered as a product X on January 10 and placed on the top of the shelf A, and registered as a product Y on February 1. Information such as “arranged in the lower part of shelf B”. The TAG movement history represents information such as “00:00 registration, 02:00 process A, 08:20 inspection process” when the electronic shelf label 1 is used in a factory.

  The number of TAG communications represents the number of communications performed by the electronic shelf label 1 or an integrated value of the amount of data communicated. By recording the number of TAG communications, the amount of power consumed by the electronic shelf label 1 can be predicted. The TAG estimated battery remaining amount represents an estimated value of the remaining amount of power that can be supplied by the battery 14.

  FIG. 4 is a block diagram showing the configuration of the shelf label master unit 2 included in the electronic shelf label system 6. The shelf label base unit 2 periodically communicates with the electronic shelf label 1 at a predetermined time or a predetermined time interval. Communication between the shelf label master 2 and the electronic shelf label 1 is started by transmitting predetermined information from the shelf label master 2 to the electronic shelf label 1.

  The shelf label base unit 2 includes a base unit wireless communication unit 51, a base unit communication unit 52, a base unit control unit 53, a base unit storage unit 54, and a base unit timing unit 55. Furthermore, the shelf label base unit 2 has a base unit power supply unit (not shown). The master unit power supply unit is connected to, for example, a commercial power source and supplies power to the shelf label master unit 2.

  The base unit radio communication unit 51 includes a base unit antenna 57 and a base unit transmission / reception control circuit 58. Base unit control unit 53 includes a base unit communication control unit 61, a slave unit information generation / update unit 62, and a base unit communication schedule management unit 63. The parent device storage unit 54 stores a parent device control program 66, child device information 42, and parent device communication schedule information 67.

  The base unit wireless communication unit 51 performs wireless communication with one or a plurality of electronic shelf labels 1. The base unit antenna 57 transmits and receives signals to and from the electronic shelf label 1 by radio. Base unit transmission / reception control circuit 58 is connected to base unit antenna 57 and base unit control unit 53. The base unit transmission / reception control circuit 58 sends the information represented by the signal received by the base unit antenna 57 to the base unit control unit 53 and transmits the signal represented by the information sent from the base unit control unit 53 to the slave unit antenna 21. The base unit communication unit 52 is connected to the store server 3 via the LAN 8 and communicates with the store server 3.

  The base unit control unit 53 is realized by a CPU (not shown), and the CPU controls the overall operation of the shelf label base unit 2 by executing a base unit control program 66 stored in the base unit storage unit 54. The base unit communication control unit 61 controls wireless communication with the electronic shelf label 1 by the base unit wireless communication unit 51 and communication with the store server 3 by the base unit communication unit 52.

  The slave unit information generation / update unit 62 generates the slave unit information 42 and further updates the slave unit information 42 based on the information transmitted from the electronic shelf label 1. The base unit communication schedule management unit 63 creates and manages a base unit communication schedule, which is a communication plan related to the time for wireless communication between the base unit wireless communication unit 51 and the shelf label slave unit.

  The parent device storage unit 54 is realized by a semiconductor memory or the like, and is connected to the parent device control unit 53. The base unit storage unit 54 stores information acquired from the electronic shelf label 1 when the shelf label base unit 2 communicates with the electronic shelf label 1 and information related to the electronic shelf label 1 that the shelf label base unit 2 is scheduled to communicate with. Is memorized.

  The slave unit information 42 is the same as the slave unit information 42 stored in the slave unit storage unit 13 of the electronic shelf label 1. The shelf label master unit 2 stores not only the electronic shelf label 1 of the communication partner but also the slave unit information 42 of all the electronic shelf labels 1 in the electronic shelf label system 6 in the master unit storage unit 54. The base unit communication schedule information 67 is information indicating a base unit communication schedule regarding the time for performing wireless communication between the base unit wireless communication unit 51 and the electronic shelf label 1.

  Base unit timekeeping unit 55 is realized by, for example, an RTC. The base unit timer 55 outputs time information indicating the passage of time and sends it to the base unit controller 53.

  FIG. 5 is a block diagram showing a configuration of the store server 3 included in the electronic shelf label system 6. The store server 3 includes a server communication unit 71, a server control unit 72, a server storage unit 73, and a database 74. Furthermore, the store server 3 has a server power supply unit (not shown). The server power supply unit is connected to, for example, a commercial power supply and supplies power to the store server 3.

  The server communication unit 71 is connected to the shelf label master unit 2 via the LAN 8 and communicates with the shelf label master unit 2. The server control unit 72 is realized by a CPU (not shown), and the CPU controls the overall operation of the store server 3 by executing a server control program 76 stored in the server storage unit 73. The server storage unit 73 is realized by a semiconductor memory or the like, and is connected to the parent device control unit 53. A server control program 76 is stored in the server storage unit 73.

  The database 74 is realized by a storage device such as a hard disk drive and connected to the parent device control unit 53. The database 74 stores the slave unit information 42 and the master unit communication schedule information 67 stored in the master unit storage unit 54 of each shelf label master unit 2. The database 74 is used as a database 74 for backing up information held by the shelf label master unit 2 and for synchronizing the shelf label master units 2 with each other.

  The database 74 stores position information of the electronic shelf label 1 in the store. This position information is obtained by visually checking the information on the absolute position of the electronic shelf label 1 when the store is opened, when shelves are installed in the store, and when the shelf layout is changed in the store. To be recorded. The database 74 stores the result of matching in the store server 3 by comparing the position information with the signal intensity information collected from the electronic shelf label by the shelf label master.

  In the present embodiment, the shelf label master unit 2 is configured to store the slave unit information 42 of all the electronic shelf labels 1 in the electronic shelf label system 6 in the master unit storage unit 54. Alternatively, only the slave unit information 42 of the shelf label slave unit with which the shelf label master unit 2 communicates may be stored in the master unit storage unit 54. In this case, the store server 3 stores information on all the electronic shelf labels 1 in the electronic shelf label system 6 and information indicating the correspondence between the shelf label master unit 2 and the electronic shelf labels 1 that regularly communicate with each other. And stored in the server storage unit 73.

  FIG. 6 is a diagram illustrating an example of the arrangement of the electronic shelf labels 1 in the store. In the store, the shelf 81a and the shelf 81b are arranged at intervals. Electronic shelf labels 1a to 1c are arranged on the shelf 81a, and electronic shelf labels 1d and 1e are arranged on the shelf 81b. It is assumed that the electronic shelf label 1c has been moved from the shelf 81b to the shelf 81a by a store clerk.

  The shelf label master unit 2a is disposed in the vicinity of the shelf 81a, for example, vertically above, and an ellipse indicated by a reference symbol 82a indicates an area where radio waves of the shelf label master unit 2a are dominant. The shelf label base unit 2a communicates with the electronic shelf labels 1a to 1c. The shelf label master unit 2b is disposed in the vicinity of the shelf 81b, for example, vertically above, and an ellipse indicated by a reference symbol 82b indicates an area where radio waves of the shelf label master unit 2b are dominant. The shelf label base unit 2b communicates with the electronic shelf labels 1d and 1e.

  When the electronic shelf label 1c is moved from the shelf 81b arranged in the area 82b to the shelf 81a arranged in the area 82a, the electronic shelf label 1c detects that the electronic shelf label 1c has moved due to a change in radio wave intensity. The radio wave intensity refers to the signal intensity when the electronic shelf label 1c receives a signal transmitted from the shelf label master 2b.

  When the electronic shelf label 1c detects that it has moved, the electronic shelf label 1c monitors communication between the electronic shelf labels 1a and 1b around the electronic shelf label 1c and the shelf label master unit 2a. Through this monitoring, the electronic shelf label 1c performs self-learning, learns data update frequency and data update timing of surrounding electronic shelf labels 1a and 1b, and predicts when to wait for synchronous communication or when to try synchronous communication And create a slave unit communication schedule.

  When the electronic shelf label 1c is moved from the shelf 81b to the shelf 81a and communication is established with the shelf label master unit 2a, the difference between the prediction result by self-learning and the actual communication time or communication timing is shown. It confirms and it memorize | stores in the subunit | mobile_unit memory | storage part 13 as correction data for performing relearning. The electronic shelf label 1c corrects the slave unit communication schedule based on the stored correction data.

  For example, it is assumed that a product that lowers the product price by performing a time sale is displayed on the shelf 81a every evening, and a product that does not change the product price is displayed on the shelf 81b. The electronic shelf labels 1a to 1c arranged on the shelf 81a and the electronic shelf labels 1d and 1e arranged on the shelf 81b have different communication frequencies with the shelf label master 2. As described above, even when the electronic shelf label 1c is moved from the shelf 81b to the shelf 81a, it creates a slave unit communication schedule by self-learning and appropriately communicates with the shelf label master unit 2 Can be done at any time.

  FIG. 7 is a diagram illustrating the transition of the operation state of the electronic shelf label 1. In FIG. 7, each operation state of the electronic shelf label 1 is indicated by reference signs A1 to A9. In the operation state A1, when the electronic shelf label 1 is newly installed or reset in the store, the electronic shelf label 1 moves to the operation state A2.

  In the operation state A2, the electronic shelf label 1 is in an emergency sense state because communication with the communication partner shelf label master unit 2 is not performed. In order to prepare for communication, the electronic shelf label 1 checks the surrounding radio wave environment and moves to the operation state A3.

  In the operation state A3, the electronic shelf label 1 is in the first learning state, and the handset wireless communication unit 11 measures the strength of radio waves transmitted from the surrounding shelf label base unit 2, that is, the signal strength, and the most appropriate communication partner. The shelf label master unit 2 is selected. The electronic shelf label 1 determines the shelf label master 2 that has transmitted the signal having the strongest signal strength as the communication partner, and moves to the operation state A4.

  In the operation state A4, the electronic shelf label 1 enters the second learning state, and receives communication contents from the communication partner shelf label master unit 2 to another electronic shelf label 1, that is, another shelf label slave unit. The other electronic shelf label 1 is an electronic shelf label 1 arranged around itself, and is an electronic shelf label 1 that communicates with the communication partner shelf label master unit 2 determined in the operation state A3. That means. Since these other electronic shelf labels 1 are presumed to be arranged in the same area in the store, the electronic shelf label 1 is instructed from the shelf label master unit 2 to the other electronic shelf labels 1 as to what kind of control instruction. Is confirmed, and the operation state A5 is entered.

  In the operation state A5, the electronic shelf label 1 enters the third learning state, and creates a slave unit communication schedule based on the content of the control instruction from the shelf label parent device 2 to the other electronic shelf label 1. When the electronic shelf label 1 is newly installed in the store or moved in the store, the electronic shelf label 1 is out of the communication circle. Therefore, by imitating the communication schedule of other electronic shelf labels 1 around Return to the circle of communication. Thus, the electronic shelf label 1 performs asynchronous communication, that is, communication with the shelf label master unit 2 without transmitting information for starting communication from the electronic shelf label 1 to the shelf label master unit 2. Can do. When the electronic shelf label 1 creates the slave unit communication schedule, the operation proceeds to the operation state A6.

  In the operation state A6, the electronic shelf label 1 enters a power saving state, that is, a standby state. The standby state is a state in which the electronic shelf label 1 operates only the slave unit timing unit 15 and waits for the next sense timing and the timing for communicating with the shelf label master unit 2. The electronic shelf label 1 moves to an operation state A7 when it is time to sense the surrounding environment, and moves to an operation state A8 when it is time to communicate with the shelf label master unit 2.

  In the operation state A7, the electronic shelf label 1 activates the slave unit wireless communication unit 11 to enter a normal sense state and confirms the surrounding radio wave environment. The electronic shelf label 1 measures the signal strength of the signal transmitted by the surrounding shelf label master unit 2 and when there is a change in the signal strength measured in the past, the operation proceeds to the operation state A3, and the signal strength and the change measured in the past. If there is no, the operation state A6 is entered.

  In another embodiment, the slave unit control unit 12 may be configured to detect a change in ambient temperature or a change in illuminance obtained by the sensor 16 in a steady sense state in the operation state A7. When there is a change between the ambient temperature or illuminance measured in the past and the newly measured ambient temperature or illuminance, the operation state A3 is entered, and when there is no change, the operation state A6 is entered.

  In the operation state A8, the electronic shelf label 1 activates the slave unit wireless communication unit 11 and enters the communication state. The electronic shelf label 1 confirms the surrounding radio wave conditions and waits for communication from the communication partner's shelf label base unit 2 to its own electronic shelf label 1. The electronic shelf label 1 moves to the operation state A9 when the communication with the communication partner is completed.

  In the operation state A9, the electronic shelf label 1 enters the control processing state, and performs processing according to the control instruction received in the operation state A8. This process includes, for example, updating of character information displayed on the display unit 17 and changing of the slave unit communication schedule. When the electronic shelf label 1 finishes the processing of the control instruction from the communication partner shelf label master unit 2, the electronic shelf label 1 moves to the operation state A6.

  As described above, the electronic shelf label 1 can create a slave unit communication schedule by performing self-learning. In this self-learning, a change in the distance between the electronic shelf label 1 and the shelf label master unit 2, that is, whether or not the electronic shelf label 1 has been moved is accurately detected by detecting a change in the surrounding radio wave condition. Can be detected. In self-learning, it is possible to detect that the electronic shelf label 1 has been moved by detecting a change in ambient temperature. For example, when the electronic shelf label 1 is moved from the freezer to a room temperature shelf in the store, the electronic shelf label 1 can accurately detect that it has been moved by detecting a change in ambient temperature. .

  In addition, the electronic shelf label 1 can detect the surroundings of the detected surroundings by setting in advance information such as that the frequency of price updates for frozen products in the freezer is not high or the timing of price updates is patterned. When the temperature is a temperature corresponding to the freezer, it is possible to create a slave unit communication schedule in which the frequency of communication with the shelf label master unit 2 is reduced.

  FIG. 8 is a flowchart showing a part of the processing of the electronic shelf label 1. FIG. 9 is a flowchart showing the remaining processing of the electronic shelf label 1. When the electronic shelf label 1 is installed in the store, the process proceeds to step B0 and processing is started.

  In step B1, the electronic shelf label 1 is reset by the operation. In step B2, the signal strength measuring unit 34 measures the ambient radio wave strength, that is, the signal strength. In step B3, the slave unit communication control unit 33 stores the signal strength value of the measurement result in the slave unit storage unit 13 in a state associated with the shelf label master unit 2 that has transmitted the signal.

  In step B4, handset controller 12 determines whether all channels have been measured. In the wireless communication between the electronic shelf label 1 and the shelf label base unit 2, one or more predetermined wireless frequencies are set, and all channels are all frequencies set in advance. Say. If it is determined by the handset controller 12 that all channels have been measured, the process proceeds to step B6, and if it is determined that all channels have not been measured, the process proceeds to step B5. In step B5, the slave unit communication control unit 33 changes the reception channel and proceeds to step B2.

  In Step B6, the strongest access point, that is, the shelf label master unit 2 is selected by the slave unit radio communication unit 11, the signal strength measurement unit 34, the signal strength comparison unit 35, and the slave unit communication control unit 33. Specifically, the slave unit wireless communication unit 11 receives signals from the plurality of shelf label master units 2. The signal strength measuring unit 34 measures the signal strength representing the signal strength of the signal from each shelf label parent device 2 received by the receiving unit. The signal strength comparison unit 35 compares the magnitudes of the signal strengths measured by the signal strength measurement unit 34. The subunit | mobile_unit communication control part 33 determines the shelf label main | base station 2 which transmitted the signal which shows the largest signal strength among the several signal strengths compared by the signal strength comparison part 35 as a communicating party.

  In Step B7, the slave unit control unit 12 determines whether the information received by the slave unit wireless communication unit 11 is information obtained by communication with the selected access point, that is, the communication partner shelf label master unit 2. Determine whether or not. If the slave unit control unit 12 determines that communication is not being performed with the communication partner shelf label master unit 2, the process proceeds to step B <b> 8, and communication is established with the communication partner shelf label master unit 2. If it is determined that the process has been performed, the process proceeds to step B9.

  In step B8, handset controller 12 determines whether or not a non-reception state has elapsed for a predetermined time. If it is determined by the handset controller 12 that the unreceived state has elapsed for a predetermined time, the process proceeds to step B2, and if it is determined that the unreceived state has not elapsed for a predetermined time, the process proceeds to step B7.

  In Step B9, the slave unit control unit 12 determines whether or not the signal analyzed by the analysis unit 31 is communication schedule information of another electronic shelf label 1, that is, information on a default communication plan determined for the slave unit. judge. When the slave unit control unit 12 determines that the analyzed signal is the communication schedule information of the other electronic shelf label 1, the process proceeds to step B10, and the analyzed signal is the communication schedule information of the other electronic shelf label 1. If not, the process proceeds to Step B11.

  In Step B10, the communication plan creation unit, based on the communication schedule of the other electronic shelf label 1 received by the slave unit wireless communication unit 11, that is, the default communication plan, the slave unit wireless communication unit 11 and the communication partner shelf label parent A slave unit communication schedule with the unit 2 is created. Specifically, the communication plan creation unit creates a communication schedule that is the same as the communication schedule of the other electronic shelf label 1 as the slave unit communication schedule, and proceeds to step B14.

  In Step B11, the slave unit control unit 12 determines whether or not reception from the shelf label master unit 2 of the communication partner is the first time. If it is determined by the slave unit control unit 12 that it is the first reception from the shelf label master unit 2 of the communication partner, the process proceeds to step B12 and is not the first reception from the shelf label master unit 2 of the communication partner. That is, if it is determined that it is the second time, the process proceeds to step B13.

  In step B12, the slave unit timer unit 15 starts timing in order to measure the passage of time from the time when the information is received from the shelf label master unit 2 of the communication partner in step B7, and proceeds to step B7.

  In step B13, the analysis unit 31 performs communication a plurality of times between any one of the one or more shelf label master units 2 and one of the one or more other electronic shelf labels 1. When it is performed, a time interval of a plurality of times of communication is measured based on the signal received by the slave unit wireless communication unit 11 and the time information from the time measuring unit. Specifically, the analysis unit 31 measures a time interval from the start of time measurement in step B12 to the time point when the second information is received in step b7. The analysis unit 31 outputs the measured time interval value as an analysis result.

  The communication plan creation unit creates a slave unit communication schedule for switching the slave unit radio communication unit 11 from the standby state to the normal state at the period of the time interval measured by the analysis unit 31. If a communication plan preparation part produces a subunit | mobile_unit communication schedule based on the analysis result of the analysis part 31, it will progress to step B14.

  In step B14, handset controller 12 performs registration for the access point. In Step B15, the slave unit communication control unit 33 switches the slave unit wireless communication unit 11 from the normal mode to the standby mode, and proceeds to Step B16. By switching to the standby mode, power consumption can be reduced.

  In step B16, the handset controller 12 determines whether or not the present time is the timing of the communication interval measured in step B13, according to the handset communication schedule created by the communication plan creation section. If it is determined by the slave unit control unit 12 that it is not the time for the communication interval, the process proceeds to step B17. If it is determined that the time is for the communication interval, the process proceeds to step B18.

  In Step B <b> 17, the slave unit control unit 12 determines whether or not the current time is a periodical communication according to the slave unit communication schedule created by the communication plan creation unit. Periodic communication refers to communication performed between the shelf label master 2 and the electronic shelf label 1 at a predetermined time. If the slave control unit 12 determines that it is not time for regular communication, the process proceeds to step B15. If it is determined that it is time for regular communication, the process proceeds to step B18.

  In Step B18, the slave unit communication control unit 33 switches the slave unit wireless communication unit 11 from the standby mode to the normal mode, and proceeds to Step B19. In step B19, the signal strength measuring unit 34 measures the ambient radio field strength. Specifically, the signal strength measuring unit 34 measures the signal strength of signals transmitted from a plurality of shelf label master units 2 including communication partners at predetermined intervals such as the timing of communication intervals and the timing of regular communication. To do.

  In step B20, the signal strength determination unit 36 calculates a difference value by subtracting the latest signal strength of the communication partner from any one of the past signal strengths of the communication partner measured by the signal strength measurement unit 34. Then, it is determined whether or not the difference value is larger than a predetermined threshold value. When the signal strength determination unit 36 determines that the communication strength has not changed, that is, the difference value is equal to or less than a predetermined threshold value, the process proceeds to step B21.

  If the signal strength determining unit 36 determines that the communication strength has changed, that is, the difference value is greater than a predetermined threshold value, the process proceeds to step B2. When the processing in steps B2 to B4 is completed and the process proceeds to step B6, the handset communication control unit 33 transmits a signal indicating the maximum signal strength among the plurality of signal strengths measured by the signal strength measurement unit 34. The shelf label master 2 is determined as a new communication partner.

  In step B <b> 21, the slave unit control unit 12 determines whether control instruction information representing a control instruction has been received from the shelf label master unit 2 of the communication partner. If it is determined by the slave unit control unit 12 that control instruction information has been received, the process proceeds to step B22. If it is determined that control instruction information has not been received, the process proceeds to step B15.

  In step B22, handset controller 12 determines whether or not the control instruction information is schedule update information related to the handset communication schedule update. If it is determined that the received control instruction information is schedule update information, handset communication plan creation unit 32 proceeds to step B23. If it is determined that the received control instruction information is not schedule update information, it proceeds to step B24. move on.

  In step B23, the communication plan creation unit updates the slave unit communication schedule based on the schedule update information. The communication plan creation unit stores the updated child device communication schedule in the child device storage unit 13, and proceeds to step B15.

  In step B24, the subunit | mobile_unit control part 12 controls the electronic shelf label 1 based on the received control instruction information, and progresses to step B15. This control is performed, for example, by changing the product name or product price displayed on the display unit 17, transmitting the slave unit information 42 to the shelf label master unit 2 of the communication partner, or the like.

  FIG. 10 is a flowchart showing the processing of the shelf label master unit 2. When the shelf label base unit 2 is installed in the store, the process proceeds to step C0 and processing is started. In Step C1, the shelf label master 2 is reset by the operation. In step C2, server information related to communication between the parent communication unit 52 and the store server 3 is set by the operation.

  In step C3, the base unit control unit 53 determines whether or not it is time to synchronize predetermined data with the store server 3 based on the information indicating the passage of time from the base unit timing unit 55. If the parent device control unit 53 determines that it is time to synchronize data, the process proceeds to step C4. If it is determined that it is not time to synchronize data, the processing in step C3 is performed again. In Step C4, base unit communication unit 52 communicates with store server 3 to synchronize predetermined data.

  In step C <b> 5, the parent device communication unit 52 acquires the child device control information and the child device display information from the store server 3. The slave unit control information is information indicating the correspondence between the shelf label master unit 2 and the electronic shelf label 1 that regularly communicate with each other, the slave unit communication schedule information 43 that instructs the shelf label slave unit, and the shelf label slave unit. Sense information. The slave unit display information is information such as a product name and a product price to be displayed on the display unit 17 of the electronic shelf label 1. The control instruction information described above includes handset control information and handset display information.

  In step C <b> 6, base unit control unit 53 determines whether or not the information acquired from store server 3 includes update information. The update information refers to information that should update the slave unit information 42 stored in the slave unit storage unit 13 of the electronic shelf label 1. If the base unit control unit 53 determines that the update information is not included in the information acquired from the store server 3, the process proceeds to step C7, where it is determined that the update information is included in the information acquired from the store server 3. Then, the process proceeds to Step C8.

  In step C7, base unit control unit 53 determines whether there is unreflected information. The unreflected information refers to information excluding information that has already updated the slave unit information 42 of the electronic shelf label 1 among the update information. If the base unit control unit 53 determines that there is unreflected information, the process proceeds to step C8. If it is determined that there is no unreflected information, the process proceeds to step C3.

  In step C8, the base unit communication control unit 61 determines whether or not the present time is the time for communication with the electronic shelf label 1 based on the base unit communication schedule stored in the base unit storage unit 54. To do. If it is determined by the master communication control unit 61 that it is not time to communicate with the electronic shelf label 1, the process proceeds to step C9, and if it is determined that it is time to communicate with the electronic shelf label 1, Proceed to step C10.

  In step C9, base unit control unit 53 sets an unreflected information flag and proceeds to step C3. If the unreflected information flag is set, the master unit control unit 53 determines that there is update information when the process proceeds to step C6 again to make a determination. In Step C10, the parent device communication control unit 61 starts communication with the target child device, that is, the electronic shelf label 1 to be communicated.

  In step C11, base unit control unit 53 determines whether or not an ACK (Acknowledgement: response information) flag is set. ACK is information sent from the electronic shelf label 1 to the shelf label master 2 and is a signal indicating that the electronic shelf label 1 has received information from the shelf label master 2. When receiving the ACK from the electronic shelf label 1, the base unit communication control unit 61 sets the ACK flag. If the base unit control unit 53 determines that the ACK flag is not set, the process proceeds to step C12. If it is determined that the ACK flag is set, the process proceeds to step C14.

  In step C12, the parent device control unit 53 sets a child device lost flag. The slave unit lost flag indicates that communication with the electronic shelf label 1 to which information is to be transmitted is not normally performed. In step C13, the parent device control unit 53 sets the child device lost flag and proceeds to step C3.

  In step C14, the parent device control unit 53 confirms that the transmission of information to the electronic shelf label 1 is successful. In step C15, base unit control unit 53 determines whether or not data request information indicating a request for data transmission has been returned from electronic shelf label 1. If the base unit control unit 53 determines that the data request information has been returned from the electronic shelf label 1, the process proceeds to step c16. If it is determined that the data request information has not been returned from the electronic shelf label 1, the process proceeds to step c17.

  In step C16, base unit control unit 53 sets a re-request flag and proceeds to step C3. If this re-request flag is set, the master unit control unit 53 determines that there is update information when the process proceeds to step C6 again to make a determination.

  In step C <b> 17, the parent device control unit 53 confirms that the data request information is not returned from the electronic shelf label 1. In step C18, base unit control unit 53 sets a transmission / reception establishment flag and proceeds to step C3. The transmission / reception establishment flag indicates that transmission / reception of information between the base unit wireless communication unit 51 and the electronic shelf label 1 has been completed.

  FIG. 11 is a flowchart showing the processing of the store server 3. When the store server 3 is installed in the store, the process proceeds to step D0 to start processing. In step D1, store server 3 is reset by operation. In step D2, server information related to communication between the server communication unit 71 and the shelf label parent device 2, and parent device information indicating the position of the shelf label parent device 2 in the store are set by operation.

  In step D <b> 3, the server control unit 72 determines whether or not the present time is a time to synchronize predetermined data with the shelf label parent device 2. If the parent device control unit 53 determines that it is time to synchronize data, the process proceeds to step D4. If it is determined that it is not time to synchronize data, the processing in step D3 is performed again.

  In step D4, the server communication unit 71 communicates with the shelf label master 2 to synchronize predetermined data. In step D5, the server communication unit 71 transmits the slave unit control information and the slave unit display information to the shelf label master unit 2.

  In step D6, the server control unit 72 determines whether there is update information to be further updated in the shelf label master unit 2. If the server control unit 72 determines that there is no update information, the process proceeds to step D3. If it is determined that there is update information, the process proceeds to step D7.

  In step D <b> 7, the server control unit 72 determines whether or not an unreflected information flag is set on the shelf label parent machine 2. If the server control unit 72 determines that the unreflected information flag is set on the shelf label master unit 2, the process proceeds to step D8. If the server control unit 72 determines that the unreflected information flag is not set on the shelf label base unit 2, the process proceeds to step D9. move on. In step D8, the server control unit 72 sets an unreflected information flag on the store server 3 side, and proceeds to step D9.

  In step D <b> 9, the server control unit 72 determines whether or not the slave unit lost flag is set on the shelf label master unit 2. If the server control unit 72 determines that the slave unit lost flag is set on the shelf label master unit 2, the process proceeds to step D10. If the server control unit 72 determines that the slave unit lost flag is not set on the shelf label base unit 2, the process proceeds to step D11. move on. In step D10, the server control unit 72 sets a slave unit lost flag on the store server 3 side, and proceeds to step D11.

  In step D <b> 11, the server control unit 72 determines whether or not a re-request flag is set on the shelf label parent machine 2. If the server control unit 72 determines that the re-request flag is set on the shelf label master unit 2, the process proceeds to step D12. If the server control unit 72 determines that the re-request flag is not set on the shelf label base unit 2, the process proceeds to step D13. In step D12, the server control unit 72 sets a re-request flag on the store server 3 side, and proceeds to step D13.

  In step D <b> 13, the server control unit 72 determines whether there is request data from the shelf label parent device 2 to the store server 3 that should request the update of the database 74. If the server control unit 72 determines that there is request data, the process proceeds to step D14. If it is determined that there is no request data, the process proceeds to step D3.

  In step D14, the server control unit 72 reflects the request data in the database 74 and proceeds to step D3. Specifically, the server control unit 72 changes, for example, some items of the child device information 42 in the database 74.

  In the embodiment described above, in the electronic shelf label 1, the shelf label master unit 2, and the store server 3 constituting the electronic shelf label system 6, the slave unit control program 41, the master unit control program 66, and the server in which the CPU is stored in the memory. The above-described functions are realized by executing the control programs 76, but the control programs 41, 66, and 76 for realizing the functions are not limited to being stored in the memory. The program may be recorded on a computer-readable recording medium. The recording medium may be a recording medium that can be read by providing a program reading device as an external storage device (not shown) in the electronic shelf label 1, the shelf label master unit 2, and the store server 3, and inserting the recording medium therein, for example. Alternatively, it may be a storage device of another device.

  Any recording medium may be used as long as the stored control programs 41, 66, and 76 are accessed from a computer and executed. Alternatively, in any recording medium, the control programs 41, 66, and 76 are read out, and the read out control programs 41, 66, and 76 are stored in the program storage area of the storage device. The control program 41, 66, 76 may be configured to be executed.

The recording medium configured to be separable from the electronic shelf label 1, the shelf label master 2, and the store server 3 is, for example, a tape recording medium such as a magnetic tape / cassette tape, a magnetic disk such as a flexible disk / hard disk, or a CD- ROM (Compact Disk Read Only
Memory) / MO (Magneto Optical disk) / MD (Mini Disc) / DVD (Digital
Versatile Disk) / CD-R (Compact Disk Recordable) / Optical disc recording media such as Blu-ray Disc, IC (Integrated Circuit) card (including memory card) / Card recording media such as optical card, or mask ROM / EPROM (
Erasable Programmable Read Only Memory) / EEPROM (Electrically Erasable
Programmable Read Only Memory) or a recording medium that carries a fixed program including a semiconductor memory such as a flash ROM.

Further, the electronic shelf label 1, the shelf label master 2 and the store server 3 may be configured to be connectable to a communication network, and the control programs 41, 66, and 76 may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, an intranet, an extranet, a LAN (Local Area Network), an ISDN (Integrated)
Services Digital Network), VAN (Value Added Network), CATV (Community)
A communication network such as an antenna television communication network, a virtual private network, a telephone line network, a mobile communication network, or a satellite communication network can be used. Further, the transmission medium constituting the communication network is not particularly limited. For example, the transmission medium may be wired such as IEEE 1394, USB (Universal Serial Bus), power line carrier, cable TV line, telephone line, ADSL (Asymmetric Digital Subscriber Line) line. , IrDA (Infrared
It can also be used for wireless such as infrared data, Bluetooth (registered trademark), 802.11 wireless, HDR (High Data Rate), cellular phone network, satellite line, terrestrial digital network, etc. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave, in which each control program 41, 66, 76 is embodied by electronic transmission.

  As described above, the wireless communication device 5 includes a slave unit wireless communication unit 11 that is a reception unit and a communication unit, an analysis unit 31, a slave unit communication plan creation unit 32 that is a communication plan creation unit, and a communication plan storage unit. A slave unit storage unit 13, a slave unit timing unit 15 that is a timing unit, and a slave unit communication control unit 33 that is a communication control unit are configured. The slave unit wireless communication unit 11 includes at least one shelf label of one or more shelf label master units 2 and one or more other electronic shelf labels 1 that can communicate with the shelf label master unit 2. A signal transmitted from the parent device 2 or another electronic shelf label 1 is received. When the signal is received by the slave unit wireless communication unit 11, the analysis unit 31 analyzes the received signal and outputs information represented by the signal as an analysis result. The subunit | mobile_unit radio | wireless communication part 11 communicates by radio | wireless by using one shelf label parent | base station 2 among the one or several shelf label parent | base stations 2 as a communicating party. The subunit | mobile_unit communication plan preparation part 32 produces the communication plan regarding the time which performs radio | wireless communication between the subunit | mobile_unit radio | wireless communication part 11 and a communicating party based on the analysis result which the analysis part 31 output. The subunit | mobile_unit memory | storage part 13 memorize | stores the communication plan information showing the communication plan produced by the subunit | mobile_unit communication plan preparation part 32. FIG. The subunit | mobile_unit time measuring part 15 outputs the time information showing time progress. Based on the communication plan information stored in the child device storage unit 13 and the time information output by the child device timer unit 15, the child device communication control unit 33 changes the state of the child device wireless communication unit 11 with the communication partner. The communication is switched between a communicable state in which communication is possible and a standby state in which communication is performed without performing communication with the communication partner.

  As a result, the wireless communication device 5 monitors communication between the shelf label master unit 2 and the other electronic shelf label 1, and when should the communication between the wireless communication device 5 and the shelf label master unit 2 be performed. Can be self-learning. Therefore, the wireless communication device 5 can predict the time when the shelf label master 2 transmits information to the other electronic shelf labels 1 as the time when the shelf label master 2 transmits information to the wireless communication device 5. . Accordingly, the wireless communication device 5 can reduce power consumption by switching to the standby state at a time when communication with the shelf label parent device 2 is predicted not to be performed. The wireless communication device 5 can receive information from the shelf label master unit 2 by switching to a receivable state at a time when communication with the shelf label master unit 2 is predicted to be performed.

  Also, the wireless communication device 5 can create a communication plan without having the communication plan transmitted from the shelf label master unit 2. Accordingly, the wireless communication device 5 can suppress an increase in the amount of information in communication with the shelf label master unit 2.

  Further, the analysis unit 31 performs communication a plurality of times between any one of the one or more shelf label masters 2 and any one of the one or more other electronic shelf labels 1. Then, based on the signal received by the slave unit radio communication unit 11 and the time information from the slave unit timing unit 15, the time interval of the multiple communications is measured. The analysis unit 31 outputs the measured time interval value as an analysis result.

  As a result, when the shelf label master 2 communicates with other electronic shelf labels 1 at regular time intervals, the wireless communication device 5 creates a communication plan for switching between a transmittable state and a standby state at this time interval. be able to. Therefore, the wireless communication device 5 can perform communication with the shelf label master unit 2 in a time zone in which the shelf label master unit 2 communicates with other electronic shelf labels 1. Thereby, the wireless communication device 5 can reliably receive the information transmitted from the shelf label master unit 2.

  Further, the slave unit communication plan creation unit 32 analyzes that the information represented by the signal received by the slave unit wireless communication unit 11 is information on the default communication plan determined for the other electronic shelf label 1, by the analysis unit 31. Then, a communication plan is created based on the received default communication plan.

  As a result, when the shelf label master unit 2 communicates with another electronic shelf label 1 at a predetermined time, the wireless communication device 5 changes the prescribed communication plan of the other electronic shelf label 1 to its own communication plan. By doing so, a communication plan can be created in a short time. Therefore, the wireless communication device 5 can perform communication with the shelf label master unit 2 in a time zone in which the shelf label master unit 2 communicates with other electronic shelf labels 1. Therefore, the wireless communication device 5 can reliably receive information transmitted from the shelf label master unit 2.

  Furthermore, a plurality of shelf label master units 2 are installed at a predetermined distance. The slave unit wireless communication unit 11 receives signals from the plurality of shelf label master units 2. The signal strength measuring unit 34 measures the signal strength representing the signal strength of the signal from each shelf label master unit 2 received by the slave unit wireless communication unit 11. The signal strength comparison unit 35 compares the magnitudes of the signal strengths measured by the signal strength measurement unit 34. The subunit | mobile_unit communication control part 33 determines the shelf label main | base station 2 which transmitted the signal which shows the largest signal strength among the several signal strengths compared by the signal strength comparison part 35 as a communicating party.

  Thus, the wireless communication device 5 can determine an optimum communication partner from the plurality of shelf label master units 2 even when the plurality of shelf label master units 2 are installed. Therefore, since the wireless communication device 5 performs communication with the shelf label master unit 2 showing the maximum signal strength, that is, the communication partner, stable wireless communication can be performed.

  Furthermore, the signal strength measuring unit 34 measures the signal strength of signals transmitted from a plurality of shelf label master units 2 including communication partners at predetermined time intervals. The signal strength determination unit 36 calculates a difference value by subtracting the latest signal strength of the communication partner from any one of the past signal strengths of the communication partner measured by the signal strength measurement unit 34. Is greater than a predetermined threshold value. When the signal strength determination unit 36 determines that the difference value is greater than a predetermined threshold, the handset communication control unit 33 determines the maximum signal strength among the plurality of signal strengths measured by the signal strength measurement unit 34. The shelf label parent device 2 that has transmitted the signal shown is determined as a new communication partner.

  As a result, the wireless communication device 5 determines whether or not the signal strength has changed, thereby determining whether the distance to the shelf label master unit 2 has changed, that is, whether or not the wireless communication device 5 has moved. Can do. Therefore, the wireless communication device 5 can determine a new communication partner from among the plurality of shelf label masters 2 even if the wireless communication device 5 moves and cannot communicate with the communication partner.

  Further, the electronic shelf label 1 includes a wireless communication device 5 and a display unit 17 that can display character information. The subunit | mobile_unit radio | wireless communication part 11 receives the information of the goods name and goods price of a predetermined goods from the shelf label main | base station 2. FIG. The display unit 17 displays the product name and product price information received by the slave unit wireless communication unit 11.

  Thus, even if the electronic shelf label 1 is newly installed in the store or moved in the store and the communication partner is not known, for example, the electronic shelf label 1 Communication with the shelf label master unit 2 is received and self-learning is performed, and communication partners can be determined from the plurality of shelf label master units 2. Therefore, the electronic shelf label 1 can receive product information from an appropriate communication partner and display the product name and the product price. In addition, the electronic shelf label 1 can reduce power consumption by predicting a time during which communication with the shelf label master unit 2 is not performed by self-learning and setting the electronic shelf label 1 in a standby state at this time.

  Furthermore, the wireless communication method includes a reception process, an analysis process, a communication plan creation process, a communication plan storage process, a timing process, and a communication control process. In the reception process, at least one shelf label master 2 or one or more other electronic shelf labels 1 that can communicate with the shelf label master 2 and the shelf label master 2 or A signal transmitted from another electronic shelf label 1 is received by the slave unit wireless communication unit 11. In the analysis step, when a signal is received in the reception step, the received signal is analyzed, and information represented by the signal is output as an analysis result. In the communication plan creation step, a slave unit wireless communication unit that performs wireless communication using one shelf label master unit 2 of one or a plurality of shelf label master units 2 as a communication partner based on the analysis result output in the analysis step 11 and a communication plan related to the time for wireless communication with the communication partner. In the communication plan storage step, communication plan information representing the communication plan created in the communication plan creation step is stored in the child device storage unit 13. In the time measuring step, time information indicating the passage of time is output by the slave unit timer unit 15. In the communication control process, based on the communication plan information stored in the communication plan storage process and the time information output in the timing process, the state of the slave unit wireless communication unit 11 can be communicated with the communication partner. The state is switched between a possible state and a standby state in which communication with the communication partner is not performed.

  Thus, in the wireless communication method, the communication between the shelf label master 2 and the other electronic shelf label 1 is monitored, and when the communication between the wireless communication device 5 and the shelf label master 2 should be performed. Can self-learn. Therefore, in the wireless communication method, the time when the shelf label master 2 transmits information to the other electronic shelf labels 1 can be predicted as the time when the shelf label master 2 transmits information to the wireless communication device 5. Thus, in the wireless communication method, the power consumption can be reduced by switching the other electronic shelf label 1 wireless communication unit to the standby state at a time when communication with the shelf label master unit 2 is predicted not to be performed. it can. In the wireless communication method, information from the shelf label master unit 2 can be received by switching the slave unit radio communication unit 11 to a receivable state at a time when communication with the shelf label master unit 2 is expected to be performed. it can.

  In the wireless communication method, a communication plan can be created without having the communication plan transmitted from the shelf label master unit 2. Thus, in the wireless communication method, it is possible to suppress an increase in the amount of information in communication with the shelf label master unit 2.

  Further, the wireless communication program causes the computer to execute a wireless communication method reception step, an analysis step, a communication plan creation step, a communication plan storage step, a timing step, and a communication control step. Thus, it is possible to provide a program for causing a computer to execute each step of the wireless communication method.

  Further, the wireless communication program is recorded on a computer-readable recording medium. Thereby, it can be provided as a computer-readable recording medium in which the wireless communication program is recorded.

1 Electronic shelf label 2 Shelf label master unit 3 Store server 5 Wireless communication device 6 Electronic shelf label system 8 LAN
11 slave unit wireless communication unit 12 slave unit control unit 13 slave unit storage unit 14 battery 15 slave unit timing unit 16 sensor 17 display unit 21 slave unit antenna 22 slave unit transmission / reception control circuit 31 analysis unit 32 slave unit communication plan creation unit 33 child Device communication control unit 34 Signal strength measurement unit 35 Signal strength comparison unit 36 Signal strength determination unit 37 Display control unit 41 Child device control program 42 Child device information 43 Child device communication schedule information 51 Master device wireless communication unit 52 Master device communication unit 53 Base unit control unit 54 Base unit storage unit 55 Base unit timing unit 57 Base unit antenna 58 Base unit transmission / reception control circuit 61 Base unit communication control unit 62 Slave unit information generation / update unit 63 Base unit communication schedule management unit 66 Base unit control program 67 Base unit communication schedule information 71 Server communication unit 72 Server control unit 73 Server storage unit 74 Database 76 Server control unit Grams 81a, 81b shelf

Claims (9)

A receiving unit that receives a signal transmitted from at least any one of the one or more parent devices and one or more child devices that can communicate with the parent device; and
When the signal is received by the receiving unit, the received signal is analyzed, and an analysis unit that outputs information represented by the signal as an analysis result;
A communication unit that performs wireless communication using one parent device as a communication partner among the one or more parent devices;
Based on the analysis result output by the analysis unit, a communication plan creation unit that creates a communication plan related to time for wireless communication between the communication unit and the communication partner,
A communication plan storage unit for storing communication plan information representing a communication plan created by the communication plan creation unit;
A timekeeping unit that outputs time information representing the passage of time;
Based on the communication plan information stored in the communication plan storage unit and the time information output by the time measuring unit, the communication unit is in a communicable state in which communication with the communication partner is possible, and A wireless communication apparatus comprising: a communication control unit that switches to a standby state in which the communication partner is on standby without performing communication with a communication partner.   The analysis unit receives the reception by the reception unit when communication is performed a plurality of times between any one of the one or more master devices and any one of the one or more slave devices. 2. The time interval of the plurality of times of communication is measured based on the received signal and time information from the timing unit, and the value of the measured time interval is output as the analysis result. A wireless communication device according to 1.   The communication plan creation unit receives the default communication plan received when the information represented by the signal received by the reception unit is information of a default communication plan determined in a slave unit and is analyzed by the analysis unit. The wireless communication device according to claim 1, wherein a communication plan is created based on the communication plan. A plurality of the master units are installed at a predetermined distance,
The receiving unit receives signals from a plurality of the base units,
A signal strength measuring unit that measures a signal strength representing the strength of the signal for the signal from each of the parent devices received by the receiving unit;
A signal strength comparison unit that compares the magnitude of each signal strength measured by the signal strength measurement unit,
The said communication control part determines the main | base station which transmitted the signal which shows the maximum signal strength among the several signal strengths compared by the said signal strength comparison part as said communication partner. 4. The wireless communication device according to any one of 3. The signal strength measuring unit measures the signal strength of signals transmitted from a plurality of parent devices including the communication partner at predetermined time intervals,
A difference value is calculated by subtracting the latest signal strength of the communication partner from any one of the past signal strengths of the communication partner measured by the signal strength measurement unit, and the difference value is calculated from a predetermined threshold value. Further includes a signal strength determination unit for determining whether or not
The communication control unit indicates a maximum signal strength among a plurality of signal strengths measured by the signal strength measurement unit when the signal strength determination unit determines that the difference value is larger than a predetermined threshold. 5. The wireless communication apparatus according to claim 4, wherein the base unit that has transmitted the signal is determined as a new communication partner. A wireless communication device according to any one of claims 1 to 5,
A display unit capable of displaying character information,
The communication unit receives information on a product name and a product price of a predetermined product from the parent device,
The display unit displays information on a product name and a product price received by the communication unit. Receiving step of receiving a signal transmitted from at least any one of the one or more parent devices and one or more child devices communicable with the parent device by the receiving unit. When,
When the signal is received in the receiving step, an analysis step of analyzing the received signal and outputting information represented by the signal as an analysis result;
Based on the analysis result output in the analysis step, wireless communication is performed between a communication unit that performs wireless communication using one of the one or more parent devices as a communication partner and the communication partner. A communication plan creation process for creating a communication plan for time;
A communication plan storage step for storing communication plan information representing the communication plan created in the communication plan creation step in a communication plan storage unit;
A time measuring process for outputting time information representing the passage of time by a time measuring unit;
Based on the communication plan information stored in the communication plan storage step and the time information output in the timing step, the communication unit is in a communicable state in which communication with the communication partner is possible, and And a communication control step of switching to a standby state for waiting without performing communication with a communication partner. On the computer,
Receiving step of receiving a signal transmitted from at least any one of the one or more parent devices and one or more child devices communicable with the parent device by the receiving unit. When,
When the signal is received in the receiving step, an analysis step of analyzing the received signal and outputting information represented by the signal as an analysis result;
Based on the analysis result output in the analysis step, wireless communication is performed between a communication unit that performs wireless communication using one of the one or more parent devices as a communication partner and the communication partner. A communication plan creation process for creating a communication plan for time;
A communication plan storage step for storing communication plan information representing the communication plan created in the communication plan creation step in a communication plan storage unit;
A time measuring process for outputting time information representing the passage of time by a time measuring unit;
Based on the communication plan information stored in the communication plan storage step and the time information output in the timing step, the communication unit is in a communicable state in which communication with the communication partner is possible, and A wireless communication program for executing a communication control step of switching to a standby state in which the communication partner is in standby without performing communication with a communication partner.   A computer-readable recording medium on which the wireless communication program according to claim 8 is recorded.

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