JP6192109B2 - Portable terminal, program, method, and system for estimating perspective relationship between objects attached with wireless tags - Google Patents

Description

  The present invention relates to a technology of a wireless tag reader (reading device) that reads a wireless tag.

  In recent years, services called IoT (Internet Of Things) and IoT (Internet Of Everything) have attracted attention. This can provide added value by connecting even “things” (for example, one ballpoint pen) that has not been connected to the conventional network to the network. According to this technology, it is necessary for the network system to manage a large amount of “things” at low cost. For example, passive RFID (Radio Frequency IDentification) tags using a UHF (Ultra High Frequency) band (for example, 920 MHz) are typically used as communication devices that can be attached to these “things”.

  A wireless tag (passive RFID tag) operates by converting a transmission wave from a wireless tag reader (RFID reader / writer) into electric power without mounting a power supply device or a communication device. A typical example is a Suica (registered trademark) card using FeliCa technology, which achieves a reading distance of about 10 cm. On the other hand, for example, by using the UHF band, the reading distance can be increased to a maximum of about several meters, and a large number of wireless tags attached to “mono” existing in the space can be collectively read (for example, non-patent) Reference 1).

  FIG. 1 is an explanatory diagram showing a use state of a conventional wireless tag reader.

  According to FIG. 1, a wireless tag reader 10 is mounted on a portable terminal 1 such as a smartphone or a tablet. In addition, a large number of objects “things” exist in the room, and a wireless tag 2 is attached to each of them. The wireless tag 2 is not limited to an electric device such as a television, an audio device, a remote controller, a camera, and a personal computer, and can be attached to various objects such as a passport, a pension book, a seal, a key, and glasses. The wireless tag reader 10 of the portable terminal can collectively read the wireless tags 2 of all the objects in the room.

UHF Class 1 Gen 2 Standard v. 2.0.0, [online], [searched on January 13, 2014], Internet <URL: http://www.gs1.org/sites/default/files/docs/uhfc1g2 /uhfc1g2_2_0_0_standard_20131101.pdf> Stick-N-Find, [online], [Search January 13, 2014], Internet <URL: https://www.sticknfind.com/default.aspx> StickR TrackR, [online], [Search January 13, 2014], Internet <URL: http://www.stickrtrackr.com/>

  According to FIG. 1, the wireless tag reader 10 mounted on the portable terminal collectively reads tag IDs of a large number of wireless tags existing in the vicinity, so that the user recognizes an object existing near the user. can do. However, the position of the object cannot be specified. It is not generally assumed that position information (absolute position, direction from a measurement point, etc.) is estimated using a wireless tag.

  According to another communication technology, a distance to a specific object can be estimated using a Bluetooth (registered trademark) device (see, for example, Non-Patent Documents 2 and 3). According to this technology, a radio wave is transmitted from a portable terminal, and a distance between Bluetooth devices is estimated using a received radio wave intensity (RSSI (Received Signal Strength Indication)) of a radio wave transmitted from an object as a response. Can do. Since Bluetooth has a communication distance of about several tens of meters, the distance can be estimated with an error range of several meters. However, the unit price of the Bluetooth device is higher than that of a passive RFID wireless tag. With Bluetooth, the distance can be estimated with an error range of several meters, so the mobile terminal moves to three locations, the distance between the mobile terminal and the device is estimated at each position, and the position of the device is determined by three-point positioning. Can be estimated.

  In the case of a wireless tag, it is difficult to estimate the distance using the received radio wave intensity as in Non-Patent Documents 2 and 3. For passive RFID, even when the UHF band is used, the communicable distance at the output power that can be used without authorization is relatively short, about 1 meter. Therefore, it is difficult to calculate a distance within 1 meter with high accuracy according to the magnitude of the received radio wave intensity. Therefore, even when the wireless tag can be read as viewed from the wireless tag reader, the received radio wave intensity cannot be associated with the distance, so that the three-point positioning cannot be used, and it is difficult to estimate the position of the wireless tag. .

  On the other hand, the inventors of the present application should not be able to estimate the distance between the wireless tag reader and the wireless tag, but should be able to estimate the distance relationship between the wireless tags. I thought. That is, if the user can derive the distance from the wireless tag of the first object whose position is known to the wireless tag of the second object whose position is unknown, the user knows the position of the second object. be able to.

  Specifically, it is assumed that the user tries to find a remote controller attached with a wireless tag, for example. As a user, he looks for a remote control around the TV but cannot find it. At this time, if the user knows the position of the camera in the room, if the user can know that the wireless tag of the camera and the wireless tag of the remote control are close to each other, You can search for a remote control.

  Therefore, the present invention provides a portable terminal, a program, a method, and a system that collectively read a wireless tag attached to each of a plurality of objects and estimate a perspective relationship between objects attached to the wireless tag. With the goal.

According to the present invention, in a portable terminal equipped with a wireless tag reader that collectively reads wireless tags attached to a plurality of objects,
Distance numerical value storage means for storing the relationship between the simultaneous reading probability and the distance coefficient;
Tag ID recording means for recording the reception time in time series for each received tag ID;
Simultaneous reading pair creation means for creating a brute force pair for a plurality of tag IDs recorded in the time range for each predetermined time range;
For each tag ID, a pair including the tag ID is searched, and the simultaneous reading probability for each other tag ID with respect to the tag ID is determined.
Probability of simultaneous reading of first tag ID and second tag ID pair =
Frequency of simultaneous reading of pair of first tag ID and second tag ID /
(First tag ID single reading frequency +
(Simultaneous reading frequency of first tag ID and second tag ID pair)
Simultaneously reading frequency calculation means for calculating by,
Inter-tag distance determining means for deriving the distance coefficient corresponding to the simultaneous reading probability with reference to the distance numerical value storage means and deriving the distance by multiplying the distance coefficient by the readable distance of the wireless tag reader ; It is characterized by having.

According to another embodiment of the mobile terminal of the present invention,
Tag ID specifying means for allowing a user to specify a tag ID whose position is to be specified;
As a determination result from the inter-tag distance determination unit, it is preferable to include a tag ID specifying unit that clearly indicates to the user a tag ID located at a short distance with respect to the specified tag ID.

According to another embodiment of the mobile terminal of the present invention,
The distance numerical value storage means stores the relationship between the simultaneous reading probability and the distance coefficient as an approximate curve based on a simulation such as the following equation:
Simultaneous reading probability = K1 / {1 + exp (K3 × distance coefficient−K2)}
It is also preferable that each K: a fixed value calculated in advance by a prior simulation or an environmental variation value .

According to another embodiment of the mobile terminal of the present invention,
It is also preferable that the wireless tag reader and the wireless tag are based on UHF (Ultra High Frequency) band passive RFID (Radio Frequency IDentification).

According to the present invention, in a program for functioning a computer included in a portable terminal equipped with a wireless tag reader that collectively reads wireless tags attached to each of a plurality of objects,
Distance numerical value storage means for storing the relationship between the simultaneous reading probability and the distance coefficient;
Tag ID recording means for recording the reception time in time series for each received tag ID;
Simultaneous reading pair creation means for creating a brute force pair for a plurality of tag IDs recorded in the time range for each predetermined time range;
For each tag ID, a pair including the tag ID is searched, and the simultaneous reading probability for each other tag ID with respect to the tag ID is determined.
Probability of simultaneous reading of first tag ID and second tag ID pair =
Frequency of simultaneous reading of pair of first tag ID and second tag ID /
(First tag ID single reading frequency +
(Simultaneous reading frequency of first tag ID and second tag ID pair)
Simultaneously reading frequency calculation means for calculating by,
Computer as tag distance determination means for deriving the distance coefficient by deriving the distance coefficient corresponding to the simultaneous reading probability with reference to the distance numerical value storage means and multiplying the distance coefficient by the readable distance of the wireless tag reader Is made to function.

According to the present invention, in a wireless tag reading method for collectively reading wireless tags attached to each of a plurality of objects using a mobile terminal equipped with a wireless tag reader,
Mobile devices
A distance numerical value storage unit for storing the relationship between the simultaneous reading probability and the distance coefficient;
For each received tag ID, a first step of recording the reception time in time series;
For a plurality of tag IDs recorded in the time range for each predetermined time range, search for a pair including the tag ID for each tag ID in the second step of creating a brute force pair, and for the tag ID The simultaneous reading probability for each other tag ID is
Probability of simultaneous reading of first tag ID and second tag ID pair =
Frequency of simultaneous reading of pair of first tag ID and second tag ID /
(First tag ID single reading frequency +
(Simultaneous reading frequency of first tag ID and second tag ID pair)
A third step of calculating by:
A fourth step of deriving the distance by deriving the distance coefficient corresponding to the simultaneous reading probability with reference to the distance numerical value storage unit and multiplying the distance coefficient by the readable distance of the wireless tag reader;
It is characterized by performing .

According to the present invention, in a system including a portable terminal equipped with a wireless tag reader that collectively reads wireless tags attached to each of a plurality of objects, and a tag management server capable of communicating with the portable terminal via a network. ,
The mobile terminal has a reception time transmitting means for transmitting the reception time to the tag management server for each received tag ID,
Tag management server
Distance numerical value storage means for storing the relationship between the simultaneous reading probability and the distance coefficient;
Tag ID recording means for recording the reception time in time series for each received tag ID;
Simultaneous reading pair creation means for creating a brute force pair for a plurality of tag IDs recorded in the time range for each predetermined time range;
For each tag ID, a pair including the tag ID is searched, and the simultaneous reading probability for each other tag ID with respect to the tag ID is determined.
Probability of simultaneous reading of first tag ID and second tag ID pair =
Frequency of simultaneous reading of pair of first tag ID and second tag ID /
(First tag ID single reading frequency +
(Simultaneous reading frequency of first tag ID and second tag ID pair)
Simultaneously reading frequency calculation means for calculating by,
Inter-tag distance determining means for deriving the distance coefficient corresponding to the simultaneous reading probability with reference to the distance numerical value storage means and deriving the distance by multiplying the distance coefficient by the readable distance of the wireless tag reader ; It is characterized by having.

According to another embodiment of the system of the present invention,
Mobile devices
A tag ID specifying means for causing a user to specify a tag ID whose position is to be specified and transmitting the tag ID to a tag management server;
A tag ID specifying means for clearly indicating to the user the tag ID received from the tag management server;
It is also preferable that the tag management server returns a tag ID located at a short distance to the user-specified tag ID received from the mobile terminal to the mobile terminal.

  According to the portable terminal, the program, the method, and the system of the present invention, it is possible to collectively read the wireless tags attached to each of the plurality of objects and to estimate the perspective relationship between the objects attached with the wireless tags. .

It is explanatory drawing showing the use condition of the conventional wireless tag reader. It is explanatory drawing showing the use condition of the wireless tag reader of this invention. It is a sequence diagram in the present invention. It is explanatory drawing showing the simultaneous reading progress of the wireless tag in this invention. It is a graph showing the distance count with respect to simultaneous reading probability. It is a functional block diagram of the portable terminal in this invention. It is a functional block diagram of the tag management server in this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 2 is an explanatory diagram showing the usage state of the wireless tag reader of the present invention.

  According to FIG. 2, similarly to FIG. 1, the mobile terminal 1 is equipped with a UHF band wireless tag reader (RFID reader / writer) 10. In addition, a passive wireless tag (RFID tag) 2 is attached to each of a large number of objects existing around the mobile terminal 1. The wireless tag reader 10 can collectively read the wireless tags 2 of all communicable objects.

  According to the present invention, for example, a closed space such as a residence or an office is assumed, and the user who owns the mobile terminal 1 moves through the space. Thereby, the wireless tag reader 10 mounted on the portable terminal 1 can read the wireless tags 2 attached to a large number of objects existing in the space. The read tag ID and the reception time are stored in association with each other. Then, the distance relation between the tag IDs is estimated by counting the frequency with which the tag ID pairs are simultaneously read. As a result, it is possible to know the perspective relation of the distance to the wireless tag of the target object located at a short distance with respect to the tag ID of the target object specified by the user. In particular, it is preferable to attach a wireless tag to an object (for example, an outlet or a lighting fixture) that is fixedly installed indoors.

  FIG. 3 is a sequence diagram in the present invention.

  The wireless tag reader 10 transmits a transmission wave for each wireless tag 2 and receives a response wave including a tag ID.

  The wireless tag reader 10 transmits a preamble radio wave as a UHF band transmission wave, and then transmits a radio wave modulated by a READ command and a radio wave of an unmodulated carrier. The wireless tag 2 has a built-in rectifier circuit, and obtains a direct current by rectifying the transmission wave received from the wireless tag reader 10 and operates as a power source. The wireless tag 2 accumulates power necessary for the initial operation by the preamble radio wave received from the wireless tag reader 10. Thereafter, the wireless tag 2 demodulates the radio wave including the READ command. The wireless tag 2 returns a response wave including the tag ID to the reflected wave of the radio wave of the unmodulated carrier.

  In addition, the wireless tag reader 10 employs an “access method” method in which a plurality of wireless tags 2 are read in a batch. In this case, one wireless tag can be read in several tens of milliseconds to several hundred milliseconds, and collision avoidance (anti-collision) by space / frequency division or time division is executed. The reading order includes a character string order of a tag ID of a wireless tag and a random number order method. As a result, the wireless tag reader can also read a plurality of wireless tags in a batch while preventing mutual interference.

  Note that the timing at which the wireless tag reader 10 starts transmitting the transmission wave to the wireless tag 2 may be based on a user tap operation on the reading start button of the mobile terminal.

(Step 1: S1) The mobile terminal 1 records the “reception time” of the response wave in time series for each tag ID received by the wireless tag reader 10. The wireless tag reader 10 may further receive data from the wireless tag 2 in addition to the tag ID. The data may be, for example, “object name”. The portable terminal 1 can make a user visually recognize by displaying these tag ID and target object name on a display.

(Step 2: S2) Creation of Simultaneous Reading Pair For each predetermined time range, the mobile terminal 1 creates a pair of round robins for a plurality of tag IDs recorded in the time range. The predetermined time range may be, for example, 5 minutes.

Then, the following detection frequency (number of occurrences) is counted.
(1) Number of times the tag ID and each other tag ID are read in pairs
Tag ID1-tag ID2 pair read count
Tag ID1-tag ID3 pair read count
Tag ID1-tag ID4 pair read count
Number of times of reading tag ID1 -...
Tag ID2-Tag ID3 pair read count
Tag ID2-tag ID4 pair read count
Number of times of reading tag ID2 -...
Tag ID3-Tag ID4 pair read count
Number of times the pair of tag ID3 -... was read (2) Number of times the tag ID was read alone
Number of single readings for tag ID1
Number of single readings of tag ID2
Number of single readings for tag ID3
Number of single readings for tag ID4
Number of single readings

  FIG. 4 is an explanatory diagram showing the progress of simultaneous reading of the wireless tag in the present invention.

(S21) The tag ID1 (remote control) single reading count is incremented by one.
(S22) The tag ID1 (remote control) -tag ID2 (camera) pair reading count is incremented by one.
(S23) Here, the tags ID1, ID2, and ID3 are read simultaneously. At this time, a brute force pair is created, and each pair reading count is incremented by one.
The tag ID1 (remote control) -tag ID2 (camera) pair reading count is incremented by one.
The number of times of reading the tag ID1 (remote control) -tag ID3 (personal computer) is incremented by one.
The tag ID2 (camera) -tag ID3 (personal computer) pair reading count is incremented by one.
(S24) The tag ID2 (camera) -tag ID3 (personal computer) pair reading count is incremented by one.
(S25) The number of single readings of tag ID3 (personal computer) is incremented by one.
(S26) Since the tag ID cannot be read, there is no increment in the number of times.
...
(S27) The tag ID4 (television) single reading count is incremented by one.

Tag ID1-tag ID2 pair read count = 2
Tag ID1-tag ID3 pair read count = 1
Tag ID1-tag ID4 pair read count = 0
Tag ID2-tag ID3 pair read count = 2
Number of independent readings of tag ID1 = 1
Number of single readings of tag ID2 = 0
Number of single readings of tag ID3 = 1
Number of single readings of tag ID4 = 1

(Step 3: S3) Calculation of Simultaneous Reading Frequency For each tag ID, the portable terminal 1 searches for a pair including the tag ID and calculates a “simultaneous reading frequency” for each other tag ID with respect to the tag ID.
Tag ID1-tag ID2 pair read count = 2
Tag ID1-tag ID3 pair read count = 1
Tag ID1-tag ID4 pair read count = 0

As another embodiment, instead of “simultaneous reading frequency”, the following “simultaneous reading probability” may be calculated. For example, it is calculated by the following formula.
Probability of simultaneous reading of first tag ID and second tag ID pair =
Frequency of simultaneous reading of pair of first tag ID and second tag ID /
(First tag ID single reading frequency +
(Simultaneous reading frequency of first tag ID and second tag ID pair)

According to FIG. 4, the simultaneous reading probability of tag ID1 and tag ID2 is calculated as follows.
Probability of simultaneous reading of tag ID1 and tag ID2 pair = 2 / (1 + 2) = 0.666
Probability of simultaneous reading of tag ID1 and tag ID3 pair = 1 / (1 + 1) = 0.5
Probability of simultaneous reading of tag ID1 and tag ID4 pair = 0 / (1 + 0) = 0

(Step 4: S4) Determination of distance between tags The portable terminal 1 determines that other tag IDs with higher “simultaneous reading frequency” or “simultaneous reading probability” are located closer to the tag ID. According to FIG. 4, for the tag ID1, the perspective relationship between the tag IDs can be estimated from the simultaneous reading frequency or the simultaneous reading probability as follows.
Perspective relationship viewed from tag ID1: tag ID2 (close)> tag ID3 (far)
The tag ID 4 does not exist within a range of 1 m, for example.

<Method for estimating distance between tags provided with a distance numerical value storage unit>
In the case of the above-described simultaneous reading probability, it is also preferable to refer to a “distance numerical value storage unit” that stores a distance numerical value corresponding to the simultaneous reading probability in association with each other. In this case, the portable terminal 1 refers to the distance numerical value storage unit and derives a distance numerical value corresponding to the simultaneous reading probability calculated in S3.

Further, the distance numerical value storage unit may store a “distance coefficient” instead of the distance numerical value. In this case, a distance coefficient corresponding to the simultaneous reading probability is derived by referring to the distance numerical value storage unit, and the distance is derived by multiplying the distance coefficient by the readable distance of the wireless tag reader.
Distance between tag IDs = distance coefficient × (2 × readable distance of wireless tag reader)

  FIG. 5 is a graph showing the distance count with respect to the simultaneous reading probability.

The graph in FIG. 5 is calculated in advance by simulation under the following virtual environment.
Room size: 5m x 5m x 2.4m
Number of readings by wireless tag reader: 10000 times Number of wireless tags: 1500 sheets Reading distance of wireless tag reader: 1 m
Wireless tag reader movement range: Virtual indoor area

In addition, although it represents with the bar graph according to FIG. 5, of course, it is also preferable to represent the relationship between a simultaneous reading probability and a distance coefficient with the approximated curve based on simulation. Specifically, the approximate curve can be calculated by the following equation.
Simultaneous reading probability = K1 / {1 + exp (K3 × distance coefficient−K2)}
K1 = 0.5
K2 = 2.3
K3 = 7.5
Each K: a fixed value calculated in advance by a prior simulation, or an environmental variation value (the environmental variation value is the size of the room, the number of wireless tags, or the number of readings of the wireless tag reader,
(Value that varies depending on the readable distance or moving range)

  According to FIG. 3, the tag ID located at a short distance is output with respect to the tag ID specified by the user. Here, it is assumed that the user is searching for an object name “remote control” (tag ID1), for example. At this time, the user designates tag ID 1 of the remote control for portable terminal 1. On the other hand, one or more tag IDs that are estimated to be close to the tag ID1 of the remote controller are derived. According to the example of FIG. 2, it is estimated that the distance is close because the tag ID 2 of the camera and the tag ID 3 of the personal computer are read relatively frequently with respect to the tag ID of the remote controller. The portable terminal 1 can clearly show these unknown tag ID2 and tag ID3 to the user. As a result, the user can find the remote control by searching near the camera or personal computer.

  FIG. 6 is a functional configuration diagram of the mobile terminal according to the present invention.

  For example, the mobile terminal 1 such as a smartphone or a tablet includes a wireless tag reader 10, a tag ID recording unit 11, a simultaneous reading pair creation unit 12, a simultaneous reading frequency calculation unit 13, an inter-tag distance determination unit 14, and a distance numerical value. And a storage unit 15. These functional components excluding the wireless tag reader 10 are realized by executing a program that causes a computer mounted on the portable terminal 1 to function.

  The wireless tag reader 10 includes an antenna and a tag ID reading unit. The tag ID reading unit transmits a transmission wave for each wireless tag and receives a response wave including the tag ID. Then, the tag ID reading unit outputs the tag ID and the reception time to the tag ID recording unit 11.

[Tag ID recording unit 11]
The tag ID recording unit 11 records the reception time in time series for each received tag ID (see S1 in FIG. 3 described above). The tag ID recording unit 11 is referenced from the simultaneous reading pair creation unit 12.

[Simultaneous reading pair creation unit 12]
The simultaneous reading pair creation unit 12 creates pairs for each of a plurality of tag IDs recorded in the time range for every predetermined time range (see S2 in FIG. 3 described above).

[Simultaneous reading frequency calculation unit 13]
The simultaneous reading frequency calculation unit 13 searches for a pair including the tag ID for each tag ID, and calculates a simultaneous reading frequency or a simultaneous reading probability for each other tag ID with respect to the tag ID (S3 in FIG. 3 described above). reference).

[Inter-tag distance determination unit 14]
The inter-tag distance determination unit 14 determines that other tag IDs with higher simultaneous reading frequency or simultaneous reading probability are located closer to the tag ID (see S4 in FIG. 3 described above). For the simultaneous reading probability, the distance numerical value storage unit 15 is referred to, and the distance numerical value or the distance coefficient is derived.

[Distance numerical value storage unit 15]
The distance numerical value storage unit 15 stores distance numerical values corresponding to the simultaneous reading probability in association with each other. Further, a distance coefficient may be stored instead of the distance numerical value (see FIG. 5 described above).

  In addition, a tag ID input unit 16 and a tag ID clarification unit 17 from the user are provided for the application so that a tag ID located at a short distance with respect to the tag ID specified by the user can be searched. Is also preferable.

  FIG. 7 is a functional configuration diagram of the tag management server in the present invention.

  According to FIG. 7, the tag management server 3 can communicate with the mobile terminal 1 via the network, and collects the tag ID and reception time of the wireless tag read by the wireless tag reader 10 of the mobile terminal 1. To do. Then, the result of estimating the perspective relationship between the wireless tags is returned to the portable terminal 1. In addition, each function structure part of the tag management server 1 is completely the same except for the communication interface with respect to the portable terminal 1 compared with each function structure part of the portable terminal 1 of FIG.

  As described above in detail, according to the mobile terminal, the program, the method, and the system of the present invention, the wireless tags attached to each of the plurality of objects are collectively read and the objects attached with the wireless tags are connected to each other. Can be estimated.

  Various changes, modifications, and omissions of the above-described various embodiments of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

DESCRIPTION OF SYMBOLS 1 Wireless tag reader 10 Wireless tag reader 11 Tag ID recording part 12 Simultaneous reading pair creation part 13 Simultaneous reading frequency calculation part 14 Inter-tag distance determination part 15 Distance numerical value storage part 16 Tag ID input part 17 Tag ID clarification part 2 Wireless tag 3 Tag management server

Claims (8)

In a portable terminal equipped with a wireless tag reader that collectively reads wireless tags attached to each of a plurality of objects,
Distance numerical value storage means for storing the relationship between the simultaneous reading probability and the distance coefficient;
Tag ID recording means for recording the reception time in time series for each received tag ID;
Simultaneous reading pair creation means for creating a brute force pair for a plurality of tag IDs recorded in the time range for each predetermined time range;
For each tag ID, a pair including the tag ID is searched, and the simultaneous reading probability for each other tag ID with respect to the tag ID is determined.
Probability of simultaneous reading of first tag ID and second tag ID pair =
Frequency of simultaneous reading of pair of first tag ID and second tag ID /
(First tag ID single reading frequency +
(Simultaneous reading frequency of first tag ID and second tag ID pair)
Simultaneously reading frequency calculation means for calculating by,
Inter-tag distance determining means for deriving the distance coefficient corresponding to the simultaneous reading probability with reference to the distance numerical value storage means and deriving the distance by multiplying the distance coefficient by the readable distance of the wireless tag reader ; A portable terminal comprising: Tag ID specifying means for allowing a user to specify a tag ID whose position is to be specified;
2. The apparatus according to claim 1, further comprising tag ID specifying means for clearly indicating to a user a tag ID located at a short distance with respect to the specified tag ID as a determination result from the inter-tag distance determining means. The portable terminal described. The distance numerical value storage means stores the relationship between the simultaneous reading probability and the distance coefficient as an approximate curve based on a simulation such as the following equation:
Simultaneous reading probability = K1 / {1 + exp (K3 × distance coefficient−K2)}
The mobile terminal according to claim 1 or 2 , wherein each K: a fixed value calculated in advance by a prior simulation or an environmental variation value . The portable terminal according to any one of claims 1 to 3, wherein the wireless tag reader and the wireless tag are based on a UHF (Ultra High Frequency) band passive RFID (Radio Frequency IDentification). . In a program for functioning a computer included in a portable terminal equipped with a wireless tag reader that collectively reads wireless tags attached to each of a plurality of objects,
Distance numerical value storage means for storing the relationship between the simultaneous reading probability and the distance coefficient;
Tag ID recording means for recording the reception time in time series for each received tag ID;
Simultaneous reading pair creation means for creating a brute force pair for a plurality of tag IDs recorded in the time range for each predetermined time range;
For each tag ID, a pair including the tag ID is searched, and the simultaneous reading probability for each other tag ID with respect to the tag ID is determined.
Probability of simultaneous reading of first tag ID and second tag ID pair =
Frequency of simultaneous reading of pair of first tag ID and second tag ID /
(First tag ID single reading frequency +
(Simultaneous reading frequency of first tag ID and second tag ID pair)
Simultaneously reading frequency calculation means for calculating by,
Computer as tag distance determination means for deriving the distance coefficient by deriving the distance coefficient corresponding to the simultaneous reading probability with reference to the distance numerical value storage means and multiplying the distance coefficient by the readable distance of the wireless tag reader A program characterized by functioning. In a wireless tag reading method for collectively reading wireless tags attached to each of a plurality of objects using a portable terminal equipped with a wireless tag reader,
The portable terminal is
A distance numerical value storage unit for storing the relationship between the simultaneous reading probability and the distance coefficient;
For each received tag ID, a first step of recording the reception time in time series;
For a plurality of tag IDs recorded in the time range for each predetermined time range, search for a pair including the tag ID for each tag ID in the second step of creating a brute force pair, and for the tag ID The simultaneous reading probability for each other tag ID is
Probability of simultaneous reading of first tag ID and second tag ID pair =
Frequency of simultaneous reading of pair of first tag ID and second tag ID /
(First tag ID single reading frequency +
(Simultaneous reading frequency of first tag ID and second tag ID pair)
A third step of calculating by:
A fourth step of deriving the distance by deriving the distance coefficient corresponding to the simultaneous reading probability with reference to the distance numerical value storage unit and multiplying the distance coefficient by the readable distance of the wireless tag reader;
A method for reading a radio tag, comprising: In a system having a portable terminal equipped with a wireless tag reader that collectively reads wireless tags attached to each of a plurality of objects, and a tag management server capable of communicating with the portable terminal via a network,
The portable terminal has reception time transmission means for transmitting the reception time to the tag management server for each received tag ID,
The tag management server
Distance numerical value storage means for storing the relationship between the simultaneous reading probability and the distance coefficient;
Tag ID recording means for recording the reception time in time series for each received tag ID;
Simultaneous reading pair creation means for creating a brute force pair for a plurality of tag IDs recorded in the time range for each predetermined time range;
For each tag ID, a pair including the tag ID is searched, and the simultaneous reading probability for each other tag ID with respect to the tag ID is determined.
Probability of simultaneous reading of first tag ID and second tag ID pair =
Frequency of simultaneous reading of pair of first tag ID and second tag ID /
(First tag ID single reading frequency +
(Simultaneous reading frequency of first tag ID and second tag ID pair)
Simultaneously reading frequency calculation means for calculating by,
Inter-tag distance determining means for deriving the distance coefficient corresponding to the simultaneous reading probability with reference to the distance numerical value storage means and deriving the distance by multiplying the distance coefficient by the readable distance of the wireless tag reader ; A system characterized by comprising. The portable terminal is
Tag ID designation means for causing a user to designate a tag ID whose position is to be specified, and transmitting the tag ID to the tag management server;
Tag ID specifying means for clearly indicating to the user the tag ID received from the tag management server,
The system according to claim 7 , wherein the tag management server returns a tag ID located at a short distance to the user-specified tag ID received from the mobile terminal to the mobile terminal.

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