JP5082810B2 - Wireless tag and its program - Google Patents

Description

  The present invention relates to a wireless tag that uses a wireless tag to notify a user of information related to the location when the wireless tag enters a certain distance, for example.

  When a ubiquitous society begins to be realized and enters a certain distance (for example, within 10 meters) from a wireless tag, information on the location is notified, route guidance, store guidance, historic site introduction, etc., and even public places such as stations In recent years, it has been proposed to perform guidance at facilities, and a wireless tag is indispensable for realizing such a system.

  Because the wireless tag is used to acquire information about the location for each installation location, distance control is required such as detecting the wireless tag within 10 meters from the wireless tag, and the wireless tag does not reach more than necessary. Thus, a mechanism (attenuating means) for adjusting the radio field intensity is required.

  For this reason, a method corresponding to variations in received signal strength for each device has already been proposed (see, for example, Patent Document 1).

In Patent Document 1, in each terminal device, the variation for each terminal device is replaced with a standard level stored in advance (correction here) to suppress the variation, and position detection error. I try to reduce it.
JP 11-352209 A

  However, the conventional method is very effective in improving the accuracy of the transmission distance, but if the parameter setting of the wireless tag itself (for example, transmission frequency, transmission frequency, ID information) is to be performed wirelessly, the attenuation means There is a problem that parameter setting may be interrupted in the middle without being able to obtain sufficient radio field intensity.

  Therefore, in order to solve the above-described problem, the wireless tag controls the first transmission unit, the first reception unit, the attenuation unit that attenuates and transmits the signal of the first transmission unit, and the whole. In the wireless tag comprising the first control means, when the unique ID information is periodically transmitted from the first transmission means, the first reception means passes through the attenuation means. When the parameter setting signal is received by the means, the signal from the first transmission means is transmitted without going through the first attenuator until the next periodic unique ID information is transmitted. I tried to do it.

  As a result, in normal operation, if you want to set the parameters of the wireless tag wirelessly while maintaining the advantages of avoiding interference between wireless tags and improving the distance accuracy, use powerful radio waves. Since communication can be performed, sufficient radio field intensity can be obtained, and parameter setting can be avoided from being interrupted.

The first invention is a wireless tag, wherein the wireless tag controls the entire first transmission means, first reception means, attenuation means for attenuating and transmitting the signal of the first transmission means, and the whole. In the wireless tag including the first control means, when the unique ID information is periodically transmitted from the first transmission means, the first reception means passes through the attenuation means. When the parameter setting signal is received, the signal from the first transmission means is transmitted without going through the first attenuator until the next periodic unique ID information is transmitted. I did it.

  As a result, in normal operation, if you want to set the parameters of the wireless tag wirelessly while maintaining the advantages of avoiding interference between wireless tags and improving the distance accuracy, use powerful radio waves. Since communication can be performed, sufficient radio field intensity can be obtained, and parameter setting can be avoided from being interrupted.

  In a second aspect of the invention, particularly in the wireless tag of the first aspect of the invention, the wireless tag includes electric field strength measuring means, and the electric field strength of the parameter setting signal received by the first receiving means is measured by the electric field strength measuring means. If the measured electric field intensity is higher than the preset electric field strength, the settable response is transmitted from the first transmission means without passing through the first attenuator, and the parameter setting is continued. When the strength is lower than the strength, the first transmission unit transmits a non-settable response without passing through the first attenuator to stop the parameter setting.

  As a result, parameter setting is not performed in an environment where the radio field intensity is not sufficient, so that it is possible to prevent the parameter setting from being interrupted midway without obtaining a sufficient radio field intensity.

  According to a third aspect of the present invention, in the wireless tag of the first or second aspect of the invention, the wireless tag includes an electric field strength measuring unit, and the electric field strength of the parameter setting signal received by the first receiving unit is the electric field strength. Measured by the measuring means, and if the electric field strength is higher than the preset value, the settable response is transmitted from the first transmitting means without passing through the first attenuator, and the parameter setting is continued. When the process is completed, a normal end response is transmitted without going through the first attenuator.

  As a result, it is possible to more reliably detect that the parameter setting has been completed normally.

  A fourth invention is a program for causing a computer to execute at least one operation, particularly in the wireless tag of any of the first to third inventions, and includes a CPU, a RAM, a ROM, a storage device, an I / O, and the like. Part or all of the present invention can be easily realized as a program by cooperating hardware resources such as electrical information devices and computers provided. Also, by distributing the program on a recording medium or using a communication line, program distribution can be realized very easily compared to other means.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a diagram showing an example of use of a wireless tag according to Embodiment 1 of the present invention. Hereinafter, description will be made with reference to FIG.

  The wireless tag 1 is an active tag (wireless device) with a built-in battery, and is attached to equipment such as a traffic light, a power pole, a gate pole, a signboard, a post box, and a lighting lamp that are installed or arranged at a predetermined position. .

  The wireless tag 1 wirelessly outputs information including a unique ID at a constant time period (for example, every second). The portable terminal 2 is assumed to be a small and portable terminal such as a PDA equipped with a liquid crystal display, receives information including a unique ID periodically output by the wireless tag 1, and according to the ID, Information corresponding to the ID is displayed on the liquid crystal display to give guidance (to the guidance target person).

  Each wireless tag holds a unique ID, and a different wireless tag is installed for each location, and each issues a unique ID. Therefore, the location is specified, and information corresponding to the location is stored in the PDA. Alternatively, it can be retrieved from an external database and displayed.

  In addition, wireless IC tags used for such purposes are installed or placed at certain positions such as traffic lights, utility poles, gate poles, signboards, postboxes, and lighting lights. However, in order to avoid mischief, etc. It is desirable to install in a place that is out of the reach of people.

  On the other hand, even after installation, when trying to change the parameters used inside the wireless tag (for example, transmission frequency, transmission frequency, ID information), parameter setting is performed wirelessly using a parameter setting terminal. It is desirable to do.

  FIG. 2 is a diagram showing an example of the parameter setting operation of the wireless tag according to the first embodiment of the present invention. As shown in FIG. 2, a parameter that is internal information of a wireless tag (active tag) 1 installed in a traffic light or the like is being set by a parameter setting terminal 3 (by a parameter setting operator). 1 is different from FIG. 1 in that parameter setting communication to the wireless tag 1 is performed.

  FIG. 3 is a diagram illustrating an example of the internal configuration of the wireless tag 1 and the parameter setting terminal 3. Hereinafter, description will be made with reference to FIG.

  The wireless tag (active tag) 1 includes a first receiving unit 11, an electric field strength measuring unit 111 that measures the electric field strength of the radio wave received by the receiving unit 11, a first transmitting unit 12, and a first transmitting unit. Attenuating means 13 for attenuating 12 outputs and a first control means 14 for controlling these outputs are provided. Note that the attenuation means 13 for attenuating the output of the first transmission means 12 is not a constant attenuation factor, but can be changed by parameter setting. That is, in the wireless tag 1, disturbance elements such as attenuation by obstacles or reflection of radio waves by structures greatly affect the electric field strength received on the receiving side, for example, within 10 meters from the wireless tag. This is because when the wireless tag is detected, it is necessary to adjust the attenuation means 13 in order to cope with variations due to the influence of each installation location.

  The parameter setting terminal 3 is used for parameter setting of the wireless tag 1, and includes a third transmission unit 32, a third reception unit 31, and a display / input unit 33 for displaying or inputting information. And third control means 34 for controlling the whole.

  For example, when the transmission frequency is to be changed by parameter setting wirelessly, when the change information is input using the display of the parameter setting terminal 3 or the input means 33, the information is wirelessly transmitted from the third transmission means 32, When the electric field strength received by the first receiving unit 11 of the wireless tag 1 and received by the electric field strength measuring unit 111 is measured and is lower than the preset electric field strength, no parameter setting is performed. Performs parameter setting (in this case, change of transmission frequency from the wireless tag). A series of operations will be described in detail below.

  FIG. 4 is a diagram illustrating an example of a parameter setting communication sequence (normal sequence), and FIG. 5 is a diagram illustrating an example of a parameter setting communication sequence (abnormal sequence).

  The normal sequence described here is higher than a predetermined electric field strength by measuring the electric field strength received by the first receiving unit 11 of the wireless tag 1 described above and received by the electric field strength measuring unit 111. The sequence of cases is shown.

  On the contrary, the abnormal sequence similarly indicates a sequence when the electric field strength received by the electric field strength measuring unit 111 is measured and lower than a predetermined electric field strength.

  First, the normal sequence will be described with reference to FIG.

  In FIG. 4, the wireless tag (active tag) 1 periodically transmits the unique ID 1000 from the first transmission unit 12. At this time, the first control unit 14 changes the first transmission unit 12. The output is moderately attenuated and transmitted via the attenuating means 13 under control.

  The unique ID 1000 sent periodically is received by the parameter setting terminal 3 by the third receiving means 31, and parameter setting is performed before the next periodic unique ID transmission 2000 (by the wireless tag 1) is performed. A request 1001 is transmitted from the third transmission means 32. When the wireless IC tag 1 receives the parameter setting request 1001 by the first receiving unit 11 and the electric field strength measured by the electric field strength measuring unit 111 is higher than a predetermined level, the wireless IC tag 1 can be set. The response 1002 is transmitted from the first transmission unit 12. At this time, the response 1002 is transmitted without being attenuated without passing through the attenuation unit 13. As a result, important parameter communication that should not fail is communicated with strong radio waves.

  The parameter setting terminal 3 that has received the settable response 1002 by the third receiving unit 31 transmits the parameter setting 1003 from the third transmitting unit 32. The wireless tag 1 that has received the parameter setting 1003 by the first receiving unit 11 performs an internal parameter (in this case, a change in the transmission frequency from the wireless tag), and as a result, a normal end response 1004 is also received in the same manner. 1 transmission means 13 is transmitted as it is (without being attenuated). With this series of operations, the parameter setting of the wireless tag 1 by the parameter setting terminal 3 is completed.

  Next, the abnormal sequence will be described with reference to FIG. Also in FIG. 5, the unique ID 1000 is periodically transmitted from the first transmission unit 12 from the wireless tag (active tag) 1 in the same manner. At this time, the first control unit 14 performs the first transmission. The means 12 is controlled, and the output is moderately attenuated and transmitted via the attenuation means 13.

  The unique ID 1000 sent periodically is received by the parameter setting terminal 3 by the third receiving means 31, and parameter setting is performed before the next periodic unique ID transmission 2000 (by the wireless tag 1) is performed. A request 1001 is transmitted from the third transmission means 32. If the wireless IC tag 1 receives the parameter setting request 1001 by the first receiving unit 11 and the electric field strength measured by the electric field strength measuring unit 111 is lower than a predetermined level, the wireless IC tag 1 is not set. A possible response 1010 is transmitted from the first transmission means 12.

  Also at this time, the signal is transmitted without being attenuated without passing through the attenuation means 13. As a result, the parameter setting terminal 3 is more reliably communicated with a strong radio wave that parameter communication is not possible (the radio wave is weak).

  The parameter setting terminal 3 that has received the unsettable response 1010 by the third receiving unit 31 stops the subsequent parameter setting sequence.

In such a state, there is a high possibility that the distance between the wireless tag 1 and the parameter setting terminal 3 is too far. By making the distance between the two as close as possible, the electric field strength increases and parameter setting is performed. Therefore, it is also effective to display the fact on the display / input means 34 of the parameter setting terminal 3 and to give an instruction to get closer to the worker.

  As described above, when the wireless tag of the present invention wants to perform wireless tag parameter setting while maintaining the advantages of avoiding interference between wireless tags and improving the distance accuracy in normal operation. Since communication can be performed using a strong radio wave, sufficient radio wave intensity can be obtained, and parameter setting can be prevented from being interrupted.

The figure which shows an example of use of the wireless tag of Embodiment 1 of this invention The figure which shows an example of the parameter setting operation | work of the wireless tag of Embodiment 1 of this invention The figure which shows an example of the internal structure of the radio | wireless tag and parameter setting terminal of Embodiment 1 of this invention The figure which shows an example of the parameter setting communication sequence (normal sequence) of Embodiment 1 of this invention The figure which shows an example of the parameter setting communication sequence (abnormal sequence) of Embodiment 1 of this invention

Explanation of symbols

1 Radio tag (active tag)
2 Mobile terminal 3 Parameter setting terminal 4 Internet (communication network)
DESCRIPTION OF SYMBOLS 11 1st reception means 12 1st transmission means 13 Attenuation means 14 1st control means 31 3rd reception means 32 3rd transmission means 33 Display / input means 34 3rd control means 111 Electric field strength measurement means

Claims (4)

In a wireless tag comprising a first transmission means, a first reception means, an attenuation means for attenuating and transmitting the signal of the first transmission means, and a first control means for controlling the whole,
When the unique ID information is periodically transmitted from the first transmission unit, the parameter setting is completed after the parameter setting signal is received by the first reception unit via the attenuation unit. until the radio tag to transmit a signal from the first transmission means, without passing through the first attenuator. The wireless tag includes electric field strength measuring means, and the electric field strength of the parameter setting signal received by the first receiving means is measured by the electric field strength measuring means,
If the electric field strength is higher than a preset value, the settable response is transmitted from the first transmission means without passing through the first attenuator, and the parameter setting is continued.
2. The wireless tag according to claim 1, wherein when the electric field intensity is lower than a preset electric field strength, the parameter setting is stopped by transmitting an unsettable response from the first transmission unit without passing through the first attenuator. The wireless tag includes electric field strength measuring means, and the electric field strength of the parameter setting signal received by the first receiving means is measured by the electric field strength measuring means,
When the electric field strength is higher than a preset value, the settable response is transmitted from the first transmission unit without passing through the first attenuator, and the parameter setting is continued. The wireless tag according to claim 1, wherein a normal end response is transmitted without passing through the first attenuator. The program for making a computer perform at least 1 operation | movement in the radio | wireless tag of any one of Claims 1-3.

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